TY - CHAP
A1 - Beutel, R.
A1 - Reinhardt, H.-W.
A1 - Große, C.
A1 - Krause, Martin
A1 - Algernon, Daniel
A1 - Streicher, Doreen
A1 - Maierhofer, Christiane
A1 - Glaubitt, A.
T1 - Quantitativer Verfahrensvergleich
KW - ZfPBau
KW - Ultraschallecho
KW - Radar
KW - Impact-Echo
KW - Dickenmessung
KW - Betondeckung
KW - Hüllrohrortung
KW - Betonbauteile
PY - 2006
SN - 978-3-433-01833-0
SN - 0342-7617
VL - 1
IS - Kap. V / Abschnitt 11
SP - 567
EP - 573
PB - Ernst
CY - Berlin
AN - OPUS4-14379
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Lozano-Martín, D.
A1 - Akubue, G. U.
A1 - Moreau, A.
A1 - Tuma, Dirk
A1 - Chamorro, C. R.
T1 - Accurate experimental (p, rho, T) data of the (CO2 + O2) binary system for the development of models for CCS processes
N2 - The limited availability of accurate experimental data in wide ranges of pressure, temperature, and composition is the main constraining factor for the proper development and assessment of thermodynamic models and equations of state. In the particular case of carbon capture and storage (CCS) processes, there is a clear need for data sets related to the (carbon dioxide + oxygen) mixtures that this work aims to address. This work provides new experimental (p, rho, T) data for three binary (CO2 + O2) mixtures with mole fractions of oxygen x(O2) = (0.05, 0.10, and 0.20) mol/mol, in the temperature range T = (250 to 375) K and pressure range p = (0.5 to 13) MPa. The measurements were performed with a high-precision single-sinker densimeter with magnetic suspension coupling. The density data were obtained with estimated expanded relative uncertainties of 0.02 % for the highest densities and up to 0.3 % for the lowest ones.The results were compared to the corresponding results calculated by the current reference equations of state for this kind of mixtures, namely the EOS-CG (combustion gases) and the GERG-2008 equation of state, respectively. The EOS-CG yields better estimations in density than the GERG-2008 equation of state. The results from the EOS-GC model show no systematic temperature dependence. For the GERG-2008 model, however, this criterion is significantly less fulfilled.
KW - carbon capture and storage
KW - single-sinker densimeter
KW - equation of state
PY - 2020
DO - https://doi.org/10.1016/j.jct.2020.106210
SN - 0021-9614
VL - 150
SP - 106210
PB - Elsevier Ltd.
CY - Amsterdam
AN - OPUS4-50925
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Neumann, Patrick P.
A1 - Hüllmann, Dino
A1 - Krentel, Daniel
A1 - Kluge, Martin
A1 - Kohlhoff, Harald
A1 - Lilienthal, A. J.
T1 - Gas Tomography Up In The Air!
N2 - In this paper, we present an autonomous aerial robot to reconstruct tomographic 2D slices of gas plumes in outdoor environments. Our platform, the so-called Unmanned Aerial Vehicle for Remote Gas Sensing (UAV-REGAS) combines a lightweight Tunable Diode Laser Absorption Spectroscopy (TDLAS) sensor with a 3-axis aerial stabilization gimbal for aiming on a versatile octocopter. The TDLAS sensor provides integral gas concentration measurements but no information regarding the distance traveled by the laser diode's beam or the distribution of the gas along the optical path. We complemented the set-up with a laser rangefinder and apply principles of Computed Tomography (CT) to create a model of the spatial gas distribution from these integral concentration measurements. To allow for a rudimentary ground truth evaluation of the applied gas tomography algorithm, we set up a unique outdoor test environment based on two 3D ultrasonic anemometers and a distributed array of 10 infrared gas transmitters. We present first results showing the 2D plume reconstruction capabilities of the system under realistic conditions.
T2 - IEEE Sensors 2018
CY - New Delhi, India
DA - 28.10.2018
KW - Aerial robot
KW - TDLAS
KW - Gas tomography
KW - Plume
PY - 2018
SN - 978-1-5386-4707-3
SP - 396
EP - 398
PB - IEEE
AN - OPUS4-46477
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Krause, Martin
A1 - Dérobert, X.
A1 - Hugenschmidt, J.
A1 - Moczko, A.
A1 - Niederleithinger, Ernst
A1 - Taffe, Alexander
ED - L. Binda,
ED - M. di Prisco,
ED - R. Felicetti,
T1 - Benchmark for thickness measurement of concrete elements
T2 - 1st International RILEM Conference, on Site Assessment of Concrete, Masonry and Timber Structures (SACoMaTiS 2008)
CY - Varenna, Italy
DA - 2008-09-01
KW - Thickness measurement
KW - Radar
KW - Ultrasonic Echo
KW - Impact-Echo and Low Strain Techniques
PY - 2008
SN - 978-2-35158-062-2
VL - 1
IS - PRO 59
SP - 357
EP - 366
PB - RILEM Publications
AN - OPUS4-18030
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Lozano-Martín, D.
A1 - Pazoki, F.
A1 - Kipphardt, Heinrich
A1 - Khanipour, P.
A1 - Tuma, Dirk
A1 - Horillo, A.
A1 - Chamorro, C. R.
T1 - Thermodynamic (p, ρ, T) characterization of a reference high-calorific natural gas mixture when hydrogen is added up to 20 % (mol/mol)
N2 - The injection of hydrogen into the natural-gas grid is an alternative during the process of a gradual decarbonization of the heat and power supply. When dealing with hydrogen-enriched natural gas mixtures, the performance of the reference equations of state habitually used for natural gas should be validated by using high-precision experimental thermophysical data from multicomponent reference mixtures prepared with the lowest possible uncertainty in composition. In this work, we present experimental density data for an 11-compound high-calorific (hydrogen-free) natural gas mixture and for two derived hydrogen-enriched natural gas mixtures prepared by adding (10 and 20) mol-% of hydrogen to the original standard natural gas mixture. The three mixtures were prepared gravimetrically according to ISO 6142–1 for maximum precision in their composition and thus qualify for reference materials. A single-sinker densimeter was used to determine the density of the mixtures from (250–350) K and up to 20 MPa. The experimental density results of this work have been compared to the densities calculated by three different reference equations of state for natural gas related mixtures: the AGA8-DC92 EoS, the GERG-2008 EoS, and an improved version of the GERG-2008 EoS. While relative deviations of the experimental density data for the hydrogen-free natural gas mixture are always within the claimed uncertainty of the three considered equations of state, larger deviations can be observed for the hydrogen-enriched natural gas mixtures from any of the three equations of state, especially for the lowest temperature and the highest pressures.
KW - Hydrogen-enriched natural gas
KW - Single-sinker densimeter
KW - High-pressure density
KW - Equations of state
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-604742
DO - https://doi.org/10.1016/j.ijhydene.2024.05.028
SN - 0360-3199
VL - 70
SP - 118
EP - 135
PB - Elsevier BV
CY - Amsterdam
AN - OPUS4-60474
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Anker, Andy S.
A1 - Aspuru-Guzik, Alán
A1 - Ben Mahmoud, Chiheb
A1 - Bennett, Sophie
A1 - Briling, Ksenia R.
A1 - Changiarath, Arya
A1 - Chong, Sanggyu
A1 - Collins, Christopher M.
A1 - Cooper, Andrew I.
A1 - Crusius, Daniel
A1 - Darmawan, Kevion K.
A1 - Das, Basita
A1 - David, Nicholas
A1 - Day, Graeme M.
A1 - Deringer, Volker L.
A1 - Duarte, Fernanda
A1 - Eardley-Brunt, Annabel
A1 - Evans, Matthew L.
A1 - Evans, Rob
A1 - Fairlamb, Ian
A1 - Franklin, Barnabas A.
A1 - Frey, Jeremy
A1 - Ganose, Alex M.
A1 - Goulding, Mark
A1 - Hafizi, Roohollah
A1 - Hakkennes, Matthijs
A1 - Hickey, Niamh
A1 - James, Gillian
A1 - Jelfs, Kim E.
A1 - Kalikadien, Adarsh V.
A1 - Kapil, Venkat
A1 - Koczor-Benda, Zsuzsanna
A1 - Krammer, Ferdinand
A1 - Kulik, Heather J.
A1 - Kumar, Vishank
A1 - Kuttner, Christian
A1 - Lam, Erwin
A1 - Lou, Yuchen
A1 - Mante, Eltjo
A1 - Martin, Jennie
A1 - Mroz, Austin M.
A1 - Nematiaram, Tahereh
A1 - Pare, Charles W. P.
A1 - Patra, Sarbani
A1 - Proudfoot, James
A1 - Ruscic, Branko
A1 - Ryder, Matthew R.
A1 - Sakaushi, Ken
A1 - Saßmannshausen, Jörg
A1 - Savoie, Brett M.
A1 - Schneider, Nadine
A1 - Schwaller, Philippe
A1 - Skjelstad, Bastian Bjerkem
A1 - Sun, Wenhao
A1 - Szczypiński, Filip T.
A1 - Torrisi, Steven
A1 - Ueltzen, Katharina
A1 - Vishnoi, Shubham
A1 - Walsh, Aron
A1 - Wang, Xinwei
A1 - Wilson, Chloe
A1 - Wu, Ruiqi
A1 - Zeitler, Jakob
T1 - Discovering structure–property correlations: General discussion
N2 - This article is a discussion of the paper "Web-BO: Towards increased accessibility of Bayesian optimisation (BO) for chemistry" by Austin M. Mroz, Piotr N. Toka, Ehecatl Antonio del Río Chanona and Kim E. Jelfs (Faraday discussions, 2025, 256, 221-234).
KW - Materials design
KW - Machine learning
KW - Automation
KW - Materials discovery
PY - 2025
DO - https://doi.org/10.1039/d4fd90062f
SN - 1359-6640
SN - 1364-5498
VL - 256
IS - Themed collection: Data-driven discovery in the chemical sciences
SP - 373
EP - 412
PB - Royal Society of Chemistry (RSC)
CY - Cambridge
AN - OPUS4-62208
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Anker, Andy S.
A1 - Aspuru-Guzik, Alán
A1 - Bechtel, Tim
A1 - Bigi, Filippo
A1 - Briling, Ksenia R.
A1 - Das, Basita
A1 - David, Nicholas
A1 - Day, Graeme M.
A1 - Deringer, Volker L.
A1 - Dyer, Matthew
A1 - Eardley-Brunt, Annabel
A1 - Evans, Matthew L.
A1 - Evans, Rob
A1 - Franklin, Barnabas A.
A1 - Ganose, Alex M.
A1 - George, Janine
A1 - Goulding, Mark
A1 - Hickey, Niamh
A1 - James, Gillian
A1 - Kalikadien, Adarsh V.
A1 - Kapil, Venkat
A1 - Kulik, Heather J.
A1 - Kumar, Vishank
A1 - Kuttner, Christian
A1 - Lam, Erwin
A1 - Lederbauer, Magdalena
A1 - Lou, Yuchen
A1 - Martin, Jennie
A1 - Marulanda Bran, Andres
A1 - Mathea, Miriam
A1 - Pickard, Chris J.
A1 - Ruscic, Branko
A1 - Ryder, Matthew R.
A1 - Sabanza Gil, Victor
A1 - Schwaller, Philippe
A1 - Segler, Marwin H. S.
A1 - Sun, Wenhao
A1 - Tanovic, Sara
A1 - Treyde, Wojtek
A1 - Walsh, Aron
A1 - Wu, Ruiqi
T1 - Discovering synthesis targets: General discussion
N2 - This article is a discussion of the paper "Analysis of uncertainty of neural fingerprint-based models" by Christian W. Feldmann, Jochen Sieg and Miriam Mathea (Faraday discussions, 2025, DOI: 10.1039/D4FD00095A).
KW - Automation
KW - Materials acceleration platforms
KW - Machine learning
KW - Materials design
KW - Materials discovery
KW - Density functional theory
KW - Ab initio
PY - 2025
DO - https://doi.org/10.1039/D4FD90064B
SN - 1359-6640
SN - 1364-5498
VL - 256
IS - Themed collection: Data-driven discovery in the chemical sciences
SP - 639
EP - 663
PB - Royal Society of Chemistry (RSC)
CY - Cambridge
AN - OPUS4-62317
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Emamverdi, Farnaz
A1 - Huang, J.
A1 - Mosane Razavi, Negar
A1 - Bojdys, M. J.
A1 - Forster, A. B.
A1 - Budd, P. M.
A1 - Böhning, Martin
A1 - Schönhals, Andreas
T1 - Molecular Mobility and Gas Transport Properties of Mixed Matrix Membranes Based on PIM‑1 and a Phosphinine Containing Covalent Organic Framework
N2 - Polymers with intrinsic microporosity (PIMs) are gaining attention as gas separation membranes. Nevertheless, they face limitations due to pronounced physical aging. In this study a covalent organic framework containing λ5-phosphinine moieties, CPSF-EtO were incorporated as a nanofiller (concentration range 0-10 wt%) into a PIM-1 matrix forming dense films with a thickness of ca. 100 μm. The aim of the investigation was to investigate possible enhancements of gas transport properties and mitigating effects on physical aging. The incorporation of the nanofiller occurred on aggregate level with domains up to 100 nm as observed by T-SEM and confirmed by X-ray scattering. Moreover, the X-ray data show that the structure of the microporous network of the PIM-1 matrix is changed by the nanofiller.
As the molecular mobility is fundamental for gas transport as well as for physical aging, the study includes dielectric investigations of pure PIM-1 and PIM-1/CPSF-EtO mixed matrix membranes to establish a correlation between the molecular mobility and the gas transport properties. Using the time-lag method the gas permeability and the permselectivity were determined for N2, O2, CH4 and CO2 for samples with variation in filler content. A significant increase in the permeability of CH4 and CO2 (50 % increase compared to pure PIM-1) was observed for a concentration of 5 wt% of the nanofiller. Furthermore, the most pronounced change in the permselectivity was found for the gas pair CO2/N2 at a filler concentration of 7 wt%.
KW - Polymers of Intrinsic Microporosity
KW - Nanocomposites
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-595031
DO - https://doi.org/10.1021/acs.macromol.3c02419
SN - 0024-9297
VL - 57
IS - 4
SP - 1829
EP - 1845
PB - ACS Publications
AN - OPUS4-59503
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Becker, D.
A1 - Konnertz, Nora
A1 - Böhning, Martin
A1 - Schmidt, J.
A1 - Thomas, A.
T1 - Light-switchable polymers of intrinsic microporosity
N2 - The interest in (micro)porous systems is greater than ever before with microporous polymers finding application in areas such as gas storage/separation and catalysis. In contrast to the vast majority of publications on microporous polymers seeking ever higher values for surface area or uptake capacity for a particular gas, this work presents a means to render a microporous system responsive to electromagnetic stimuli. The incorporation of a diarylethene (DAE) derivative in the backbone of a polymer of intrinsic microporosity (PIM) produces a microporous system that exhibits photochromism as proven by UV–vis absorption and NMR studies. In the resulting DAE-PIM, surface area is not a fixed unalterable property but can be influenced by the external and nondestructive stimulus light in a reversible manner. Furthermore, in combination with Matrimid, free-standing membranes can be produced that display light-switchable diffusivity and permeability for carbon dioxide and oxygen. In this way, material scientists are offered the potential to employ only one system that can assume several states with different properties for each.
KW - Gaspermeation
KW - Diffusion
KW - Polymer intrinsischer Mikroporosität
KW - UV-VIS
PY - 2016
DO - https://doi.org/10.1021/acs.chemmater.6b02619
SN - 0897-4756
VL - 28
IS - 23
SP - 8523
EP - 8529
PB - ACS
CY - Whashington,DC
AN - OPUS4-38735
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Rösch, A.
A1 - Hillemeier, B.
A1 - Porzig, Ekkehard
A1 - Krause, Martin
A1 - Maierhofer, Christiane
ED - Schickert, G.
T1 - Air voids, poor compaction and areas of low concrete strength detection in concrete by pulse velocity measurements
T2 - International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE)
CY - Berlin, Germany
DA - 1995-09-26
KW - Beton, Stabilität
KW - Ultraschall
KW - Fehlstelle
KW - Hohlraum
PY - 1995
SN - 3-931381-02-1
N1 - Serientitel: BB / DGZfP – Series title: BB / DGZfP
VL - 2
SP - 895
EP - 902
PB - DGZfP, Dt. Ges. für Zerstörungsfreie Prüfung e.V.
CY - Berlin
AN - OPUS4-595
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Zhang, Yue
A1 - Martin, A.
A1 - Wolf, G.-U.
A1 - Rabe, S.
A1 - Worzala, H.
A1 - Lücke, B.
A1 - Meisel, M.
A1 - Witke, Klaus
T1 - Structural transformations of VOHPO4.1/2H2O in the Presence of Ammonia
KW - Vanadium
KW - Ammoniak
KW - Phosphat
KW - Phyrophosphorsäure
PY - 1996
SN - 0897-4756
SN - 1520-5002
VL - 8
IS - 5
SP - 1135
EP - 1140
PB - American Chemical Society
CY - Washington, DC
AN - OPUS4-684
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Agroui, K.
A1 - Collins, G.
A1 - Oreski, G.
A1 - Böhning, Martin
A1 - Hadj Arab, A.
A1 - Ouadjaout, D.
T1 - Effect of crosslinking on EVA-based encapsulant properties during photovoltaic module fabrication process
N2 - The key objective of this work is to create a comprehensive comparison between experimental analysis methods for detecting crosslinking reaction in EVA encapsulant material during PV module fabrication process. Several analytical methods, spanning from classical gel content extraction measurements over different thermo-analytic and mechanical approaches to spectroscopic analysis as Thermally Stimulated Current (TSC), have been investigated as to their ability to reveal the crosslinking state of ethylene vinyl acetate (EVA). The basic results show that TSC complements perfectly other thermal analysis methods like as Differential Scanning Calorimetry (DSC), Dynamic Mechanical Thermal Analysis (DMTA) to determine fundamental properties of EVA such as molecular mobility characteristics and also to monitor the crosslinking reaction. Exothermic peak as revealed by DSC analysis can be used to estimate the crosslinking rate of EVA during PV module encapsulation process as fast quality control test. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
L'objectif principal de ce travail est de permettre une meilleure compréhension entre les différentes techniques analyses expérimentales pour détecter la réaction de réticulation au niveau de lencapsulant Ethylène-Vinyle Acétate (EVA), durant le process de fabrication d'un module PV. Plusieurs méthodes d'analyse, allant du test classique d'extraction du taux de gel aux différentes techniques d'analyses thermomécaniques ainsi que les techniques d'analyse de spectroscopie comme le courant stimulé thermiquement (TSC), ont été étudiés pour permettre de révéler le phénomène de la réaction de réticulation de l'encapsulant l'EVA. Les résultats de base montrent que la TSC complète parfaitement d'autres méthodes d'analyses thermiques comme la calorimétrie différentielle à balayage (DSC), l'analyse mécanique dynamique (DMTA) pour déterminer les propriétés fondamentales de l'EVA. Ces techniques permettent de déterminer les caractéristiques relatives à la mobilité moléculaire et aussi pour mieux mettre en évidence la réaction de réticulation. Le pic exothermique comme révélé par l'analyse par DSC, peut être utilisé pour estimer le taux de réticulation de l'EVA au cours du process d'encapsulation du module PV comme un test rapide de contrôle de qualité.
KW - EVA
KW - Photovoltaic module
KW - Crosslinking process
KW - Thermal properties
KW - Mechanical properties
PY - 2015
SN - 1112-2242
VL - 18
IS - 2
SP - 303
EP - 314
AN - OPUS4-34994
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Tuma, Dirk
A1 - Moreau, A.
A1 - Polishuk, I.
A1 - Segovia, J. J.
A1 - Vega-Maza, D.
A1 - Martín, M. C.
T1 - Measurements and predictions of densities and viscosities in CO2 + hydrocarbon mixtures at high pressures and temperatures: CO2 + n-pentane and CO2 + n-hexane blends
N2 - This work reports new experimental data on densities and viscosities of (CO2 + n-pentane) and (CO2 + n-hexane) mixtures at high pressures and temperatures. The densities were measured by a vibrating-tube densimeter with an expanded uncertainty (k = 2) smaller than 1.8 kg/m3 at six isotherms (from 273.15 K to 373.15 K), twelve pressures starting at 5 MPa up to 100 MPa, and at six CO2 molar compositions (from 0 to 0.6). The viscosities were measured by a vibrating-wire viscometer with the corresponding relative expanded uncertainty (k = 2) smaller than 0.016 at five isotherms (from 273.15 K to 373.15 K), twelve pressures (from 5 MPa up to 100 MPa), and at two CO2 molar compositions (0.1 and 0.3). The densities were fitted by the semiempirical Tammann-Tait equation for density data and the Vogel-Fulcher-Tammann (VFT) equation for viscosity data, respectively. The Groupe Européen de Recherches Gazières (GERG-2008) equation of state was also applied for modelling the densities. Over-all robustness and reliability of the Perturbed-Chain Statistical Association Fluid Theory (PC-SAFT) and its critical point-based modification (CP-PC-SAFT) were examined. Accuracies of the Modified Yarranton-Satyro (MYS) coupled with CP-PC-SAFT and the NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP 10) in predicting the viscosities were evaluated.
KW - CO2 + n-alkanes
KW - thermophysical properties
KW - Perturbed-Chain Statistical Association Fluid Theory
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-555728
DO - https://doi.org/10.1016/j.molliq.2022.119518
SN - 0167-7322
VL - 360
SP - 1
EP - 15
PB - Elsevier
CY - Amsterdam
AN - OPUS4-55572
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Gruskovà, J.
A1 - Martin, G.
A1 - Kresten, O.
A1 - Mitthoff, F.
A1 - Kaska, K.
A1 - Hofmann, C.
A1 - Kreuzer, W.
A1 - Phelps, M.
A1 - Boydston, K.
A1 - Easton Jr., R. L.
A1 - Knox, K. T.
A1 - Kelbe, D.
A1 - Kasotakis, D.
A1 - Christens-Barry, W. A.
A1 - Stewart, D.
A1 - Rabin, Ira
A1 - Hahn, Oliver
A1 - Glaser, L.
A1 - Garrevoet, J.
A1 - Shevchuk, I.
A1 - Klumpp, S.
A1 - Deckers, D.
A1 - Buck, J.
ED - Cronier, M.
ED - Mondrain, B.
T1 - Insights-into-the-Digital-Recovery-of-the-Scythica-Vindobonesia
N2 - The Scythica Vindobonensia, the new fragments on Gothic incursions into Roman provinces in the Balkans in the middle of the third century AD that were revealed some years ago in a Greek palimpsest at the Austrian National Library in Vienna (ÖNB), are commonly considered as one of the most important additions of the last decades to the corpus of texts from classical Antiquity. Tere is a high degree of confdence among scholars in supposing that the fragments come from the lost work Scythica written in Greek by the third-century historian P. Herennius Dexippus (Δέξιππος) of Athens. The new fragments have hence also been called Dexippus Vindobonensis. In his Scythica, Dexippus recorded wars of the Romans with the Goths (and other tribes) whom he called Scythians.
The work had been hitherto known only from excerpts and quotes by later authors. Eight pages of a Byzantine manuscript copy of the ancient text have survived hidden underneath the visible surface of the last four parchment folios of the Vienna manuscript Historicus graecus 73, f. 192r -195v4. The copy is written in a Greek calligraphic minuscule which has been estimated by palaeographers to be of the middle or the second half of the eleventh century. In the thirteenth century, the text (on each of the eight pages arranged in one column, with 30 lines per page) was washed of the parchment and the valuable material made from animal skin was re-used for Christian texts. The new writing largely covered the faded remnants of the original text. It thus became hidden from the human eye for more than seven hundred years. Its discovery by Jana Grusková, a classical philologist specialized in the transmission of Greek texts, resulted from a systematic review of all Greek palimpsests kept at the Austrian National Library in Vienna at the beginning of the twenty-first century and a detailed examination of the four folios in 2007-20097.
KW - Scythica Vindobonensia,
KW - Gothic incursions
KW - A Greek palimpsest
KW - Antiquity
KW - Byzantine manuscript
KW - Vienna manuscript
PY - 2020
SN - 978-2-916716-81-7
SN - 0577-1471
VL - 2020
IS - 24/1
SP - 945
EP - 967
PB - Association des Amis du Centre d’Histoire et Civilisation de Byzance
CY - Paris
ET - 1
AN - OPUS4-53843
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Lozano-Martín, D.
A1 - Moreau, A.
A1 - Vega-Maza, D.
A1 - Chamorro, C. R.
T1 - High-pressure density data of binary (carbon dioxide + oxygen) mixtures for the development of equation-of-state models
N2 - On the way to a low carbon economy mixtures containing carbon dioxide become increasingly important. Processing of such gas mixtures requires reliable thermodynamic models that can accurately describe the state of matter over an extended range. Mixtures with oxygen for example, are frequently encountered in carbon capture and storage (CCS) processes.
This work reports new experimental (p, rho, T) data at T = (250 to 375 K) and up to a maximum pressure pmax = 20 MPa for five binary (CO2 + O2) mixtures which cover the entire composition range.
T2 - 31st European Symposium on Applied Thermodynamics
CY - Online meeting
DA - 05.07.2021
KW - Binary mixtures CO2 + O2
KW - Density measurements
KW - Equations of state
PY - 2021
AN - OPUS4-53990
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - König, S.
A1 - Diersch, R.
A1 - Lührmann, A.
A1 - Müller, Karsten
A1 - Neumann, Martin
A1 - Quercetti, Thomas
A1 - Droste, Bernhard
T1 - Full-Scale Drop Testing of the CONSTOR®, V/TC Package Program, and Preliminary Results
KW - Drop test
KW - Package
KW - Spent fuel cask
KW - Transport
PY - 2005
SN - 0893-6188
VL - 33
IS - 3
SP - 4
EP - 10
PB - Institute of Nuclear Materials Management
CY - Northbrook, Ill.
AN - OPUS4-12269
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - König, S.
A1 - Diersch, R.
A1 - Lührmann, A.
A1 - Müller, Karsten
A1 - Neumann, Martin
A1 - Quercetti, Thomas
A1 - Droste, Bernhard
T1 - Full-scale Drop Testing of the CONSTOR V/TC Package - Program and Preliminary Results
KW - Fallversuche
KW - Transportbehälter für radioaktive Stoffe
PY - 2005
SN - 0893-6188
VL - 33
IS - 3
SP - 4
EP - 10
PB - Institute of Nuclear Materials Management
CY - Northbrook, Ill.
AN - OPUS4-6875
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Martin, T
A1 - Zimmermann, E
A1 - Klitzsch, N
A1 - Hördt, A
A1 - Huisman, J A
A1 - Radic, T
A1 - Kruschwitz, Sabine
T1 - Round-robin test of SIP laboratory measurements using electrical test networks
N2 - This study presents the results of an interlaboratory test designed to evaluate the accuracy of spectral induced polarization (SIP) measurements using controlled electrical test networks. The study, conducted in Germany since 2006, involved 12 research institutes, six different impedance measurement devices and four types of electrical test networks specifically designed to evaluate phase shift errors in SIP measurements. The test networks, with impedances ranging from 100 to 150 kΩ, represent high-impedance samples with different phase characteristics, and pose the measurement challenges typical of such samples, including high contact impedances and parasitic capacitances. Four key findings emerged from the study: (1) Impedance measurements across all devices showed deviations within 1 per cent over a wide frequency range (0.001–1000 Hz); (2) phase errors remained below 1 mrad up to 100 Hz for most devices, but increased at higher frequencies due to parasitic capacitances and electromagnetic coupling effects; (3) lab-specific instruments have lower phase errors than field instruments when used in a laboratory environment, primarily due to the effects of long cables and too low input impedances of the field instruments; and (4) short cables and driven shielding technology effectively minimized parasitic capacitance and improved measurement accuracy. The study highlights the usefulness of test networks in assessing the accuracy of SIP measurements and raises awareness of the various factors influencing the quality of SIP data.
KW - Induced polarization
KW - Electrical properties
KW - Electrical resistivity tomography (ERT)
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-636755
DO - https://doi.org/10.1093/gji/ggaf153
SN - 0956-540X
VL - 242
IS - 1
SP - 1
EP - 13
PB - Oxford University Press (OUP)
AN - OPUS4-63675
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Bernardy, Christopher
A1 - Habib, Abdel Karim
A1 - Kluge, Martin
A1 - Orchini, A.
ED - Fabiano, Bruno
ED - Cozzani, Valerio
T1 - Heat Radiation Emanating from Hydrogen and Methane Jet Fires
N2 - Modelling the heat radiation emanating from jet flames for initial hazard assessment purposes is generally done using simple, steady-state, approaches that give a quick estimation useful for impact analysis. Although nowadays CFD can be used to simulate this phenomenon in detail, it is still very demanding in computational power and time, and generally not all required boundary conditions to achieve a reliable result are known.
Therefore, even today simpler empirical approaches are still widely used for consequence analysis. Hydrogen is becoming increasingly important as renewable energy carrier resulting in an increasing demand of “hydrogen-approved” models. Since the aforenamed models were mainly developed based on data from hydrocarbon jet flame experiments, it has to be verified if they also apply to hydrogen jet flames. To this purpose, real-scale tests are carried out at the BAM Test Site Technical Safety (BAM-TTS) with the aim to assess the flame geometry and the emitted thermal radiation of hydrogen and methane jet flames. In particular, the focus is laid on the measurement and modelling of the thermal radiation. Existing heat radiation data from the literature are mostly based on unsteady outflow conditions. The experimental setup used here allows for the generation of a steady-state outflow and thus a direct comparability with existing (steady-state) models. From these data, an assessment of the applicability of jet flame models to hydrogen jet flames is carried out accounting for their accuracy in predicting heat radiation and possible needs of further development.
T2 - 18th EFCE International Symposium on Loss Prevention and Safety Promotion in the Process Industries
CY - Bologna, Italy
DA - 08.06.2025
KW - Jet Fire
KW - Hydrogen
KW - Methane
KW - Heat radiation
PY - 2025
DO - https://doi.org/10.3303/CET25116065
SN - 2283-9216
VL - 116
SP - 385
EP - 390
PB - AIDIC Servizi S.r.l.
CY - Italy
AN - OPUS4-63698
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Gaber, Martin
A1 - Müller, Ralf
A1 - Brzezinka, Klaus-Werner
A1 - Peuker, Christel
A1 - Langer, A.
T1 - Analyse von Wasserstoff in Quarzglas
T2 - 76. Glastechnische Tagung
CY - Bad Soden, Deutschland
DA - 2002-05-27
PY - 2002
SP - 242
EP - 245
PB - DGG, Deutsche Glastechnische Gesellschaft e.V.
CY - Frankfurt/M.
AN - OPUS4-1636
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Müller, Thoralf
A1 - Burkert, Andreas
A1 - Heyn, A.
A1 - Balzer, Martin
A1 - Fenker, M.
T1 - Investigation on the improved corrosion behavior of TiMgN hard coating on steel substrate
T2 - EUROCORR 2015 - European corrosion congress
CY - Graz, Austria
DA - 06.09.2015
KW - Hard coatings
KW - TiMgN
KW - Corrosion
PY - 2015
SP - paper 11.1_693
AN - OPUS4-34618
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Hatami, Soheil
A1 - Würth, Christian
A1 - Kaiser, Martin
A1 - Leubner, S.
A1 - Gabriel, S.
A1 - Bahrig, L.
A1 - Lesnyak, V.
A1 - Pauli, Jutta
A1 - Gaponik, N.
A1 - Eychmüller, A.
A1 - Resch-Genger, Ute
T1 - Absolute photoluminescence quantum yields of IR26 and IR-emissive Cd1-xHgxTe and PbS quantum dots - method- and material-inherent challenges
N2 - Bright emitters with photoluminescence in the spectral region of 800–1600 nm are increasingly important as optical reporters for molecular imaging, sensing, and telecommunication and as active components in electrooptical and photovoltaic devices. Their rational design is directly linked to suitable methods for the characterization of their signal-relevant properties, especially their photoluminescence quantum yield (Φf). Aiming at the development of bright semiconductor nanocrystals with emission >1000 nm, we designed a new NIR/IR integrating sphere setup for the wavelength region of 600–1600 nm. We assessed the performance of this setup by acquiring the corrected emission spectra and Φf of the organic dyes Itrybe, IR140, and IR26 and several infrared (IR)-emissive Cd1-xHgxTe and PbS semiconductor nanocrystals and comparing them to data obtained with two independently calibrated fluorescence instruments absolutely or relative to previously evaluated reference dyes. Our results highlight special challenges of photoluminescence studies in the IR ranging from solvent absorption to the lack of spectral and intensity standards together with quantum dot-specific challenges like photobrightening and photodarkening and the size-dependent air stability and photostability of differently sized oleate-capped PbS colloids. These effects can be representative of lead chalcogenides. Moreover, we redetermined the Φf of IR26, the most frequently used IR reference dye, to 1.1 × 10-3 in 1,2-dichloroethane DCE with a thorough sample reabsorption and solvent absorption correction. Our results indicate the need for a critical reevaluation of Φf values of IR-emissive nanomaterials and offer guidelines for improved Φf measurements.
PY - 2015
DO - https://doi.org/10.1039/c4nr04608k
SN - 2040-3364
SN - 2040-3372
VL - 7
IS - 1
SP - 133
EP - 143
PB - RSC Publ.
CY - Cambridge
AN - OPUS4-32408
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dürig, Wiebke
A1 - Lindblad, Sofia
A1 - Golovko, Oksana
A1 - Gkotsis, Georgios
A1 - Aalizadeh, Reza
A1 - Nika, Maria-Christina
A1 - Thomaidis, Nikolaos
A1 - Alygizakis, Nikiforos A.
A1 - Plassmann, Merle
A1 - Haglund, Peter
A1 - Fu, Qiuguo
A1 - Hollender, Juliane
A1 - Chaker, Jade
A1 - David, Arthur
A1 - Kunkel, Uwe
A1 - Macherius, André
A1 - Belova, Lidia
A1 - Poma, Giulia
A1 - Preud'Homme, Hugues
A1 - Munschy, Catherine
A1 - Aminot, Yann
A1 - Jaeger, Carsten
A1 - Lisec, Jan
A1 - Hansen, Martin
A1 - Vorkamp, Katrin
A1 - Zhu, Linyan
A1 - Cappelli, Francesca
A1 - Roscioli, Claudio
A1 - Valsecchi, Sara
A1 - Bagnati, Renzo
A1 - González, Belén
A1 - Prieto, Ailette
A1 - Zuloaga, Olatz
A1 - Gil-Solsona, Ruben
A1 - Gago-Ferrero, Pablo
A1 - Rodriguez-Mozaz, Sara
A1 - Budzinski, Hélène
A1 - Devier, Marie-Helene
A1 - Dierkes, Georg
A1 - Boulard, Lise
A1 - Jacobs, Griet
A1 - Voorspoels, Stefan
A1 - Rüdel, Heinz
A1 - Ahrens, Lutz
T1 - What is in the fish? Collaborative trial in suspect and non-target screening of organic micropollutants using LC- and GC-HRMS
N2 - A collaborative trial involving 16 participants from nine European countries was conducted within the NORMAN network in efforts to harmonise suspect and non-target screening of environmental contaminants in whole fish samples of bream (Abramis brama). Participants were provided with freeze-dried, homogenised fish samples from a contaminated and a reference site, extracts (spiked and non-spiked) and reference sample preparation protocols for liquid chromatography (LC) and gas chromatography (GC) coupled to high resolution mass spectrometry (HRMS). Participants extracted fish samples using their in-house sample preparation method and/or the protocol provided. Participants correctly identified 9-69% of spiked compounds using LC-HRMS and 20-60% of spiked compounds using GC-HRMS. From the contaminated site, suspect screening with participants’ own suspect lists led to putative identification of on average ~145 and ~20 unique features per participant using LC-HRMS and GC-HRMS, respectively, while non-target screening identified on average ~42 and ~56 unique features per participant using LC-HRMS and GC-HRMS, respectively. Within the same sub-group of sample preparation method, only a few features were identified by at least two participants in suspect screening (16 features using LC-HRMS, 0 features using GC-HRMS) and non-target screening (0 features using LC-HRMS, 2 features using GC-HRMS). The compounds identified had log octanol/water partition coefficient (KOW) values ranging from -9.9 to 16 and mass-to-charge ratio (m/z) of 68 to 761 (LC-HRMS and GC-HRMS). A significant linear trend was found between log KOW and m/z for the GC-HRMS data. Overall, these findings indicate that differences in screening results are mainly due to the data analysis workflows used by different participants. Further work is needed to harmonise the results obtained when applying suspect and non-target screening approaches to environmental biota samples.
KW - General Environmental Science
KW - Suspect and non-target analysis
KW - Biota
KW - Expobome
KW - Collaborative trial
PY - 2023
DO - https://doi.org/10.1016/j.envint.2023.108288
VL - 181
SP - 1
EP - 24
PB - Elsevier B.V.
AN - OPUS4-58681
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Malefioudaki, Mariella
A1 - Misra, Archismita
A1 - Sbeity, Nadja
A1 - Zueco-Vincelle, Juan
A1 - Laguna-Bercero, Miguel A.
A1 - Koerdt, Andrea
A1 - Martín-Rapún, Rafael
A1 - Mitchell, Scott G.
T1 - Multifunctional polyoxomolybdate ionic liquid coatings for mitigating microbiologically influenced corrosion
N2 - Corrosion of metals and other materials in marine environments poses significant economic, operational, safety, and environmental challenges across the oil and gas industry, the renewable energy sector, and maritime infrastructure. Microbiologically influenced corrosion (MIC) accounts for a substantial portion of this corrosion, with sulfate-reducing bacteria (SRB) and methanogenic archaea (MA) being key contributors. Conventional methods such as cathodic polarization have proven insufficient in mitigating the colonization of corrosive microbial communities in real marine environments, requiring the development of alternative, broad-spectrum antimicrobial strategies to prevent such biofilm formation. Recently, molybdate has emerged as a potential alternative to traditional biocides and nitrate. Our hypothesis is polyoxometalate-ionic liquids (POM-ILs), which exhibit antimicrobial and anticorrosion properties, could have a broader spectrum of antimicrobial activity than demonstrated until now and could be capable of shielding and protecting sensitive metal surfaces from the extreme acidic environments produced by MIC microorganisms. Here we show how two prototype polyoxomolybdate-based POM-ILs, [(CH3(CH2)6)4N]2[Mo6O19] and [(CH3(CH2)6)4N]4[Mo8O26], demonstrated antimicrobial activity at microgram per millilitre concentrations, prevented biofilm formation on metal surfaces, and provided resistance to corrosive acidic environments. Furthermore, impedance measurements were commensurate with electron microscopy studies showing that POM-IL-coated brass coupons withstood extremely corrosive environments. These proof-of-concept results demonstrate how multi-functional POM-IL coatings represent promising MIC mitigation solutions by providing a hydrophobic acid-resistant and biocidal protective layer that prevents biocolonisation and acidic corrosion by MIC microorganisms.
KW - Polyoxometalates
KW - Ionic liquid
KW - Microbiologically influenced corrosion
KW - Corrosion
KW - Heritage preservation
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-631951
DO - https://doi.org/10.1039/d5mh00373c
SN - 2051-6347
VL - 12
IS - 13
SP - 4648
EP - 4661
PB - Royal Society of Chemistry (RSC)
CY - Cambridge
AN - OPUS4-63195
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Müller, M.
A1 - Kaiser, Martin
A1 - Stachowski, G.M.
A1 - Resch-Genger, Ute
A1 - Gaponik, N.
A1 - Eychmüller, A.
T1 - Photoluminescence quantum yield and matrix-induced luminescence enhancement of colloidal quantum dots embedded in ionic crystals
N2 - The incorporation of colloidal quantum dots (QDs) into solid matrices, especially ionic salts, holds several advantages for industrial applications. Here, we demonstrated via absolute measurements of photoluminescence quantum yields (PL-QY) that the photoluminescence of aqueous CdTe QDs can be considerably increased upon incorporation into a salt matrix with a simple crystallization procedure. Enhancement factors of up to 2.8 and a PL-QY of 50 to 80%, both in NaCl crystals and incorporated in silicone matrices, were reached. The fact that the achievable PL enhancement factors depend strongly on PL-QY of the parent QDs can be described by the change of the dielectric surrounding and the passivation of the QD surface, modifying radiative and nonradiative rate constants. Time-resolved PL measurements revealed noncorrelating PL lifetimes and PL-QY, suggesting that weakly emissive QDs of the ensemble are more affected by the enhancement mechanism, thereby influencing PL-QY and PL lifetime in a different manner.
PY - 2014
DO - https://doi.org/10.1021/cm5009043
SN - 0897-4756
SN - 1520-5002
VL - 26
IS - 10
SP - 3231
EP - 3237
PB - American Chemical Society
CY - Washington, DC
AN - OPUS4-31074
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Mitova, M.
A1 - Iliev, M.
A1 - Nováková, A.
A1 - Gorbushina, Anna
A1 - Groudeva, V.I.
A1 - Martin-Sanchez, Pedro Maria
T1 - Diversity and biocide susceptibility of fungal assemblages dwelling in the Art Gallery of Magura Cave, Bulgaria
N2 - Magura Cave, north-western Bulgaria, possesses valuable rock-art paintings made with bat guano and dated from the period between the Eneolithic and Bronze Ages. Since 2008, the Art Gallery is closed to the general public in order to protect the paintings from vandalism, microclimatic changes caused by visitors and artificial illumination, and the consequent growth of fungi and phototrophs. Nevertheless, some tourist visits are allowed under the supervision of cave managers. This study provides the first scientific report on cultivable fungal assemblages dwelling different substrata in the Art Gallery. A total of 78 strains, belonging to 37 OTUs (Ascomycota 81%, Zygomycota 13%, Basidiomycota 5%), were isolated in the study. This fungal diversity was clearly dominated by Penicillium (50% of strains) and Aspergillus (13%). The most relevant visible fungal colonies were detected in sediments rich in bat guano, where, besides Penicillium, other guanophilic fungi such as Mucor, Mortierella, Trichosporon and Trichoderma were dominant. Conversely, scarce fungi were detected on rock surface of painted walls. Based on the biocide susceptibility assay, octylisothiazolinone (OIT) and benzalkonium chloride (BAC) were effective inhibiting the in vitro growth of dominant fungal species in Magura Cave, when applied at concentrations ranged from 100 to 1,000 mg/L. These data provide a valuable knowledge about Magura fungi, and exemplify a type of preliminary test that may be conducted before planning any biocide treatment. However, considering the irreversible effects of biocides on the ecological balance in caves, and the low fungal contamination in painted walls of Magura Cave, there is no reason to use conventional biocides in this cave. Further studies, monitoring microbial communities and microclimatic parameters, should be conducted to improve the knowledge on microbial ecology in Magura Cave and possible human impacts, as well as to allow the early detection of potential microbial outbreaks.
KW - Fungi
KW - Rock-art caves
KW - Biocides
PY - 2017
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-397436
DO - https://doi.org/10.5038/1827-806X.46.1.2061
SN - 0392-6672
VL - 46
IS - 1
SP - 67
EP - 80
PB - Scholar Commons
CY - Tampa, FL, USA
AN - OPUS4-39743
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - RPRT
A1 - Wiesler, F.
A1 - Hund-Rinke, K.
A1 - George, E.
A1 - Greef, J.-M.
A1 - Holz, F.
A1 - Hölze, L.E.
A1 - Hülsbergen, K.-J.
A1 - Martin, S.
A1 - Severin, K.
A1 - Spielvogel, S.
A1 - Geiger, P.
A1 - Nawotke, C.
A1 - Kehlenbeck, H.
A1 - Schenkel, H.
A1 - Adam, Christian
A1 - Bloem, E.
A1 - Frank, D.
A1 - Goldbach, H.E.
A1 - Heene, M.
A1 - Kratz, S.
A1 - Kruse, A.
A1 - Möller, K.
A1 - Pinnekamp, J.
A1 - Schoumans, O.F.
A1 - Vogel, Christian
A1 - Wulf, S.
T1 - Recyclingphosphate in der Düngung – Nutzen und Grenzen
N2 - Weltweit werden etwa 80–85 % aller abgebauten Rohphosphate für die Produktion von Düngemitteln verwendet. Bei noch steigendem Bedarf an Phosphor (P) geht man derzeit davon aus, dass die weltweiten P-Reserven noch über 200 Jahre ausreichen. Um den P-Vorrat langfristig abzusichern, sollte der in Reststoffen enthaltene Phosphor möglichst umfänglich genutzt werden. Dieser Forderung trägt das von der Bundesregierung 2012 erstmals beschlossene Deutsche Ressourceneffizienzprogramm ProgRess Rechnung. Rohphosphat wird auch seitens der Europäischen Kommission aufgrundseiner ökonomischen Bedeutung und des unsicheren Angebots als „kritischer Rohstoff“ eingestuft. Vor diesem Hintergrund hat die Bundesregierung in der Verordnung zur Neuordnung der Klärschlammverwertung vom 27. September 2017 in Deutschland eine verpflichtende technische Rückgewinnung von Phosphor für Abwasserbehandlungsanlagen ab einer Ausbaugröße von 100.000 Einwohnerwerten (12 Jahre nach Inkrafttreten der Verordnung) bzw. ab einer Ausbaugröße von über 50.000 Einwohnerwerten (15 Jahre nach Inkrafttreten der Verordnung) vorgeschrieben. Die Verordnung enthält keine Vorgaben hinsichtlich der anzuwendenden Technologie bei der Phosphorrückgewinnung. Ausgenommen von der Rückgewinnungspflicht sind Klärschlämme mit niedrigen Phosphorgehalten (weniger als 20 Gramm Phosphor je Kilogramm Klärschlamm-Trockenmasse). Auch die im Jahre 2017 verabschiedeten neuen Rechtsvorschriften für die Düngung verlangen zukünftig einen nachhaltigen und ressourceneffizienten Umgang mit Nährstoffen bei der landwirtschaftlichen Erzeugung und schränken die P-Zufuhr insbesondere auf hoch versorgten Böden ein (Düngeverordnung vom 26. Mai 2017). Dies wird zu einem mehr am Pflanzenbedarf orientierten und ggf. vermehrt überbetrieblichen Einsatz von wirtschaftseigenen Düngern führen. Um den politischen und gesetzlichen Anforderungen gerecht zu werden, müssen einerseits wirksame und kosteneffiziente technische Verfahren zum P-Recycling (weiter)entwickelt werden. Andererseits müssen die Recyclingprodukte die Anforderungen für eine direkte Verwendung in der Landwirtschaft oder als Rohstoff für die Herstellung von Düngemitteln erfüllen. In dem vorliegenden Standpunkt wird zunächst der potenzielle Beitrag von Reststoffen zur Deckung des P-Bedarfs in der deutschen Pflanzenproduktion geschätzt. Für die wichtigsten Reststoffe werden technische Verfahren zur P-Rückgewinnung bzw. Aufarbeitung skizziert. Auf Basis der Anforderungen der Landwirtschaft bzw. der Düngemittelindustrie
an die P-Recyclingprodukte werden deren Herstellungsverfahren bewertet. Schließlich wird der Regelungs- und Forschungsbedarf formuliert.
KW - Phosphor
KW - Düngemittel
KW - Diffusive Gradients in thin films (DGT)
PY - 2020
SP - 1
EP - 19
PB - Bundesministerium für Ernährung und Landwirtschaft (BMEL)
CY - Berlin
AN - OPUS4-51011
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Babutzka, Martin
A1 - Burkert, Andreas
A1 - Heise, Svenja
A1 - Heyn, A.
T1 - Korrosionsuntersuchungen mit gelartigen Elektrolyten an Zink - Eine innovative Prüfmethodik
N2 - Ein neuer Ansatz bei elektrochemischen Korrosionsuntersuchungen kann durch den Einsatz von gelartigen Elektrolyten als Alternative zu wässrigen Prüfelektrolyten beschritten werden. Gelartige Elektrolyte ermöglichen minimalinvasive Untersuchungen an natürlich gebildeten Zinkdeckschichten. Dadurch können korrosionsrelevante Kennwerte ermittelt werden, die Aussagen zur Deckschichtbildung und zur Stabilität von atmosphärisch gebildeten Deckschichten erlauben. In diesem Beitrag wird anhand verschiedener Untersuchungen an Reinzink der Mehrwert von gelartigen Elektrolyten für die Korrosionsforschung und -prüfung verdeutlicht. Darüber hinaus werden neue Erkenntnisse zur Deckschichtbildung von Zink unter atmosphärischen Bedingungen vorgestellt.
T2 - GfKORR-Jahrestagung 2019
CY - Frankfurt a. M.
DA - 12.11.2019
KW - Zink
KW - Gelartige Elektrolyte
KW - Korrosionsuntersuchungen
KW - Deckschichtbildung
PY - 2019
SN - 978-3-935406-71-0
SP - 53
EP - 64
AN - OPUS4-49642
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Neumann, Martin
A1 - Schilling, O.
A1 - Kuschke, Christian
A1 - Darnstädt, A.
A1 - Schubert, Sven
A1 - Günther, U.
A1 - Wille, Frank
T1 - Requirements for management systems for manufacturing of transport packages: the new revision of BAM-GGR 011 guideline
N2 - In accordance with IAEA SSR-6 para 306 a management system shall be established and implemented to ensure compliance with the relevant provisions of the IAEA regulations. BAM has issued an update of the guideline: the BAM-GGR 011. The new revision describes necessary quality assurance measures for design, manufacture, testing, documentation, use, maintenance and inspection of packagings for package designs requiring competent authority approval for the transport of radioactive material.
The measures can be categorised as system-related and design-related. They are independently approved and monitored by the German competent authority BAM and its authorised expert (BAM/T). The qualification of the organisation applying for the design approval certificate is reviewed in the context of the design approval procedure. The quality assurance measures for manufacture consist of three main steps. Pre-assessment of manufacturing documents such as quality plans, specifications etc., Manufacturing inspections according the pre-assessed documents and inspection before commissioning including documentation review. Periodic inspections during operation as well as relevant specifications for use and maintenance ensure that the properties specified in the approval certificate are preserved over the package life time. Special provisions for the return on
experience regarding operational feedback for design, manufacture, use, maintenance and inspection are given. Special focus shall be given here to the rearranged and meanwhile established system of manufacturing inspections. This includes more transparent roles for a) the Producers authorised inspection 11282 representative, b) the independent inspection expert (S), acting on behalf of the manufacturer with acceptance of BAM, and c) BAM or its authorised expert (BAM/T). Additional attention shall be drawn to the management of deviations during manufacturing and provisions for maintenance and periodic inspections.
T2 - 19th International Symposium on the Packaging and Transportation of Radioactive Materials PATRAM 2019
CY - New Orleans, LA, USA
DA - 04.08.2019
KW - Quality assurance
KW - Transport
KW - Manufacturing
KW - Surveillance
KW - Radioactive material
PY - 2019
SP - Paper 1128, 1
AN - OPUS4-49059
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Neumann, Patrick P.
A1 - Kohlhoff, Harald
A1 - Hüllmann, Dino
A1 - Krentel, Daniel
A1 - Kluge, Martin
A1 - Dzierliński, M.
A1 - Lilienthal, A. J.
A1 - Bartholmai, Matthias
T1 - Aerial-based gas tomography – from single beams to complex gas distributions
N2 - In this paper, we present and validate the concept of an autonomous aerial robot to reconstruct tomographic 2D slices of gas plumes in outdoor environments. Our platform, the so-called Unmanned Aerial Vehicle for Remote Gas Sensing (UAV-REGAS), combines a lightweight Tunable Diode Laser Absorption Spectroscopy (TDLAS) gas sensor with a 3-axis aerial stabilization gimbal for aiming at a versatile octocopter. While the TDLAS sensor provides integral gas concentration measurements, it does not measure the distance traveled by the laser diode’s beam nor the distribution of gas along the optical path. Thus, we complement the set-up with a laser rangefinder and apply principles of Computed Tomography (CT) to create a model of the spatial gas distribution from a set of integral concentration measurements. To allow for a fundamental ground truth evaluation of the applied gas tomography algorithm, we set up a unique outdoor test environment based on two 3D ultrasonic anemometers and a distributed array of 10 infrared gas transmitters. We present results showing its performance characteristics and 2D plume reconstruction capabilities under realistic conditions. The proposed system can be deployed in scenarios that cannot be addressed by currently available robots and thus constitutes a significant step forward for the field of Mobile Robot Olfaction (MRO).
KW - Aerial robot olfaction
KW - Mobile robot olfaction
KW - Gas tomography
KW - TDLAS
KW - Plume
PY - 2019
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-487843
DO - https://doi.org/10.1080/22797254.2019.1640078
SP - 1
EP - 16
PB - Taylor & Francis
CY - London
AN - OPUS4-48784
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Musil, B.
A1 - Böhning, Martin
A1 - Johlitz, M.
A1 - Lion, A.
T1 - On the inhomogenous chemo-mechanical ageing behaviour of nitrile rubber: experimental investigations, modelling and parameter identification
N2 - Elastomers are used in almost all areas of industrial applications, such as tires, engine mounts, bridge bearings, seals or coatings. During their use in operation, they are exposed to different environmental influences. These include, in particular, climatic factors such as air oxygen, high temperatures, light (UV radiation) and the influence of media (e.g. oils, fuels). A very important result of these factors is the chemical ageing of elastomers. In this case, the elastomer degenerates and changes its chemical structure in the aged regions, which leads to an irreversible change in the material properties in connection with the reduction in its usability. In this paper, chemical ageing of nitrile butadiene rubber (NBR) is investigated. Especially in case of thermo-oxidative ageing at elevated operating temperatures, the ageing processes run inhomogeneously. These effects are known as diffusion-limited oxidation (DLO) and are associated with the diffusion–reaction behaviour of atmospheric oxygen with the elastomer network. For these reasons, NBR samples are artificially aged in air and subjected to different experimental methods, which are presented and discussed. Additional results from inhomogeneous mechanical tests and permeation tests indicate the causes of the DLO-effect, show the influence of chemical ageing and are subsequently used for parameter identification in relation to the diffusion–reaction equation. A continuum-mechanical modelling approach is also presented here, which describes the finite hyperelasticity, diffusion–reaction processes as well as chemical degradation and reformation of the elastomer network. This multifield problem leads to a system of partial and ordinary differential equations and constitutive equations and is solved within the finite element method.
KW - Rubber
KW - Ageing
KW - Gas permeability
KW - DLO
KW - NBR
PY - 2019
DO - https://doi.org/10.1007/s00161-019-00791-1
SN - 0935-1175
SN - 1432-0959
VL - 32
IS - 1
SP - 127
EP - 146
PB - Springer
CY - Heidelberg
AN - OPUS4-48560
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Zakel, S.
A1 - Schröder, Volkmar
A1 - Askar, Enis
A1 - Gabel, D.
A1 - Hirsch, W.
A1 - Kleinert, J.
A1 - Krause, U.
A1 - Krietsch, Arne
A1 - Meistes, J.
A1 - Sachtleben, A.
A1 - Schmidt, Martin
T1 - Sicherheitstechnische Kenngrößen des Explosionsschutzes von hybriden Stoffgemischen - Normungsfähige Bestimmungsverfahren
N2 - In diesem Verbundvorhaben werden standardisierte Messverfahren für hybride Gemische erarbeitet, die der Bestimmung sicherheitstechnischer Kenngrößen des Explosionsschutzes dienen. Unter einem hybriden Gemisch wird dabei ein mehrphasiges System aus Brenngas oder brennbarem Dampf, sowie Luft und brennbarem Staub verstanden. Die Veröffentlichung der Ergebnisse erfolgt in einem Abschlussbericht und als DIN-Spezifikation (DIN SPEC). Diese DIN SPEC versetzt Prüfinstitute und Industrie in die Lage, Explosionsgefahren beim Betrieb technischer Anlagen mit hybriden Gemischen einzuschätzen und damit Prozesse sowohl sicherer als auch effizienter zu steuern. Dieses Projekt wird im Rahmen des WIPANOProgramms (Wissens- und Technologietransfer durch Patente und Normen) vom BMWi gefördert.
T2 - 14. Fachtagung Anlagen-, Arbeits- und Umweltsicherheit
CY - Köthen, Germany
DA - 07.11.2019
KW - Explosionsschutz
KW - Sicherheitstechnische Kenngrößen
KW - Hybride Gemische
KW - Normung
PY - 2019
SN - 978-3-89746-220-5
SP - 73
CY - Frankfurt am Main
AN - OPUS4-49954
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Schumm, A.
A1 - Martin, E.
A1 - Beaumont, M.
A1 - Ewert, Uwe
A1 - Kolkoori, Sanjeevareddy
A1 - Zscherpel, Uwe
A1 - Wrobel, Norma
A1 - Redmer, Bernhard
T1 - A comparative study on the performance of digital detector systems for high energy applications
N2 - For cast components reaching or exceeding total material thicknesses of 150mm, high energy sources such as linear accelerators or Betatrons are required in order to obtain reasonable exposure times. In this study, the performance of digital detector systems, involving imaging plates (IP) and digital detector arrays (DDA), was evaluated with respect to the testing class B requirements as formulated in the standard EN ISO 17636-2. As a reference, traditional radiographic film and a Cobalt-60 source was used. With film exposures, testing class B was achieved with Co-60 and Betatron (7.5 MV) at longer exposure times. The preliminary results show that the testing class B was not obtained with the examined digital detector arrays (DDA) and the high resolution imaging plates (IP) , even at 40, 60 and 80 minutes exposure time with a 7.5 MV Betatron. Class A was achieved using high resolution imaging plates with optimized metal filters between object and IPs and a high resolution DDA with intermediate Cu filters. Class A was also achieved applying a DDA with lower basic spatial resolution than required by Table B.13 of EN ISO 17636-2, but using the compensation principle as described in this standard. The next generation of digital detector arrays might potentially be able to obtain class B performance with the expected spatial resolution and sensitivity improvements.
T2 - ECNDT 2014 - 11th European conference on non-destructive testing
CY - Prague, Czech Republic
DA - 06.10.2014
KW - Radiography
KW - Image quality
KW - Betatron
KW - Digital detector array (DDA)
KW - Casting
KW - Standards
KW - High energy radiography
KW - Comparison of detectors
KW - Steel weldment
PY - 2014
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-323075
UR - https://www.ndt.net/?id=16394
SN - 1435-4934
VL - 19
IS - 12
SP - 1
EP - 6
PB - NDT.net
CY - Kirchwald
AN - OPUS4-32307
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Guilherme, A.
A1 - Buzanich, Günter
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Coroado, J.
A1 - Dos Santos, J.M.F.
A1 - Carvalho, M.L.
T1 - Synchrotron micro-XRF with compound refractive lenses (CRLs) for tracing key elements on Portuguese glazed ceramics
N2 - Several glazed ceramic fragments (XVIth to XVIIIth centuries) from two production centers in Portugal (Coimbra and Lisbon) were the object of this study. The ones from Coimbra comprise two sets of samples: faiences and tiles. The ones from Lisbon are only tiles (azulejos, in Portuguese). The three main divisions of such pieces are the ceramic support (body), glaze and surface decoration. The system decoration/glaze is not easy to investigate, due to the high heterogeneity resulting from the mixing procedures and firing temperatures used. Moreover, the ability of the pigment to diffuse into the base glaze varies depending on the composition of both the pigment and the glaze in terms of fusibility. In order to raster these effects, high resolution techniques are required. In this work, synchrotron micro-X-ray fluorescence (µ-XRF) analysis was performed to monitor the profiles of the characteristic elements from the colors used and the glaze in well prepared cross-sections of the samples. Key elements are: Co for blue, Mn for purple, Cu for green, Sb for yellow, Pb for the glaze and Fe for the body. The major difference observed is that faiences have glaze thicknesses between 150 and 200 µm and tiles have glaze thicknesses between 350 and 400 µm. Furthermore, in faiences all the pigments except the yellow ones are well dispersed into the glassy matrix, while in tiles, all of them are just partially diffused throughout the glaze. However, differences between the tiles from Coimbra and Lisbon were observed. In the samples from Lisbon, a higher intake from the pigment throughout the glaze is observed.
KW - Synchrotron micro-XRF
KW - Compound refractive lenses (CRLs)
KW - Portuguese glazed ceramics
PY - 2012
DO - https://doi.org/10.1039/c2ja30030c
SN - 0267-9477
SN - 1364-5544
VL - 27
IS - 6
SP - 966
EP - 974
PB - Royal Society of Chemistry
CY - London
AN - OPUS4-26789
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Bjeoumikhov, A.
A1 - Bjeoumikhova, Zemfira
A1 - Riesemeier, Heinrich
A1 - Radtke, Martin
A1 - Wedell, R.
T1 - Propagation of synchrotron radiation through nanocapillary structures
N2 - The propagation of synchrotron radiation through nanocapillary structures with channel sizes of 200 nm and periods in the micrometer size has been studied experimentally. It was shown that the propagation through individual capillary channels has a mode formation character. Furthermore it was shown that during the propagation through capillary channels the coherence of synchrotron radiation is partially conserved. Interference of beams propagating through different capillary channels is observed which leads to a periodically modulated distribution of the radiation intensity in a plane far from the exit of the structure. These investigations are of high relevance for the understanding of X-ray transmission through nanocapillaries and the appearance of wave properties at this size scale.
KW - Polycapillary structure
KW - Nanocapillary
KW - X-ray optics
KW - Wave properties
KW - Synchrotron radiation
KW - X-ray diffraction
PY - 2007
DO - https://doi.org/10.1016/j.physleta.2007.01.092
SN - 0031-9163
SN - 0375-9601
VL - 366
IS - 4-5
SP - 283
EP - 288
PB - North-Holland Publ. Co.
CY - Amsterdam
AN - OPUS4-20580
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Tissot, I.
A1 - Troalen, L.G.
A1 - Manso, M.
A1 - Ponting, M.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Barreiros, M. A.
A1 - Shaw, I.
A1 - Carvalho, M.L.
A1 - Guerra, M.F.
T1 - A multi-analytical approach to gold in Ancient Egypt: Studies on provenance and corrosion
N2 - Recent results from a three-year multi-disciplinary project on Ancient Egyptian gold jewellery revealed that items of jewellery from the Middle Kingdom to the New Kingdom were manufactured using a variety of alluvial gold alloys. These alloys cover a wide range of colours and the majority contain Platinum Group Elements inclusions. However, in all the gold foils analysed, these inclusions were found to be absent. In this work a selection of gilded wood and leather items and gold foil fragments, all from the excavations by John Garstang at Abydos (primarily from Middle Kingdom graves), were examined using Scanning Electron Microscopy-Energy Disperse Spectroscopy (SEM-EDS), X-Ray Fluorescence (µXRF), Particle Induced X-Ray Emission (µPIXE) and Double Dispersive X-Ray Fluorescence (D²XRF). The work allowed us to characterise the composition of the base-alloys and also to reveal the presence of Pt at trace levels, confirming the use of alluvial gold deposits. Corrosion products were also investigated in the foils where surface tarnish was visually observed. Results showed that the differences in the colour of corrosion observed for the foils are related not only to the thickness of the corrosion layer but also to a multi-layer structure containing the various corrosion products.
KW - Gold
KW - Egypt
KW - PGE
KW - Provenance
KW - Corrosion
KW - muXRF
KW - muPIXE
KW - D2XRF
KW - SEM-EDS
PY - 2015
DO - https://doi.org/10.1016/j.sab.2015.03.012
SN - 0584-8547
SN - 0038-6987
VL - 108
SP - 75
EP - 82
PB - Elsevier
CY - Amsterdam
AN - OPUS4-33155
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Lutz, C.
A1 - Hampel, S.
A1 - Beuermann, S.
A1 - Turek, T.
A1 - Kunz, U.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Fittschen, U. E. A.
T1 - Investigation on Vanadium Species Distribution in Nafion™ 117 after Cyclization in a Vanadium Redox Flow Battery
N2 - The vanadium redox flow battery (VRFB) is currently a potential candidate for stationary energy storage. A major challenge is the unintended vanadium transport through the separator, which results in a fade of capacity. To overcome this issue, it is necessary to understand the transport processes in the membrane on a more fundamental level. In this work, the vanadium species distribution in Nafion™ 117 after cyclization was investigated. Two membranes, one from a charged VRFB and another from a discharged VRFB, were analyzed using ultraviolet–visible spectroscopy (UV/VIS) and X-ray absorption near edge structure spectroscopy (XANES). Little difference between the two membranes was recognizable according to the UV/VIS results. In comparison, the XANES results showed that the membrane from the charged VRFB contains more V3+ than VO2+, whereas for the discharged case, more VO2+ is present in the membrane.
KW - Synchrotron
KW - BAMline
KW - XANES
KW - Vanadium redox flow battery
PY - 2021
VL - 64
SP - 1
EP - 8
AN - OPUS4-54144
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Simons, C.
A1 - Mans, C.
A1 - Hanning, S.
A1 - Janßen, A.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Ostermann, Markus
A1 - Michaelis, Matthias
A1 - Wienold, Julia
A1 - Alber, D.
A1 - Kreyenschmidt, M.
T1 - Study on microscopic homogeneity of polymeric candidate reference materials BAM H001-BAM H010 by means of synchrotron µ-XRF and LA-ICP-MS
N2 - In this study the microscopic homogeneity of the newly developed plastic reference materials BAM H001-BAM H010 was investigated. The materials consist of an acrylonitryle-butadien-styrene terpolymer, doped with different amounts of the elements Br, Cd, Cr, Hg and Pb. For the quantitative determination of the degree of homogeneity, a procedure proposed by Kempenaers et al. (Fresenius J. Anal. Chem., 2001, 369, 733-737) was used. On every sample an extensive number of different points were analyzed and standard deviation for every element mentioned above was used to calculate a minimal sampling mass that is necessary to reach a certain level of uncertainty caused by inhomogeneity (mmin,5%). The experiments were taken out with synchrotron µ-XRF (SR µ-XRF) at BESSYII in Berlin and by laser ablation inductively coupled plasma mass spectroscopy (LA-ICP-MS). The calculated values for mmin,5% of both techniques showed comparable results for all elements. It could be shown that the materials are suitable for calibration of micro analytic techniques if at least 64 µg are used.
KW - XRF
KW - LA-ICP-MS
KW - RoHS
KW - CRM
PY - 2010
DO - https://doi.org/10.1039/b917008a
SN - 0267-9477
SN - 1364-5544
VL - 25
SP - 40
EP - 43
PB - Royal Society of Chemistry
CY - London
AN - OPUS4-20938
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Kühbacher, M.
A1 - Weseloh, G.
A1 - Bertelsmann, H.
A1 - Özaslan, M.
A1 - Radtke, Martin
A1 - Riesemeier, Heinrich
A1 - Kyriakopoulos, A.
A1 - Behne, D.
T1 - Analysis of metal- and metalloid-containing proteins by SRXRF at the BAMline
N2 - Pilot studies have been carried out at the BAMline at BESSY II in collaboration with the Bundesanstalt
für Materialforschung und -prüfung (BAM) on metal- and metalloid-containing compounds in biological
samples after electrophoretic protein separation. After sodium dodecylsulfate polyacrylamide gel
electrophoresis (SDS-PAGE) and transfer onto a blotting membrane the distribution of selenium among
the proteins of testis homogenate of a rat and a wallaby was determined. The comparison with the
autoradiogram of 75Se-labeled proteins separated in the same way showed that of nine seleniumcontaining
proteins found in rat testis homogenate by autoradiography four could be detected by
synchrotron radiation X-ray fluorescence analysis (SRXRF).
PY - 2003
UR - http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/berichte/bessy/annualreport2002.pdf#page=333
SN - 0179-4159
SP - 333
EP - 335
PB - Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
CY - Berlin
AN - OPUS4-2495
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Schäfer, D.
A1 - Simon, R.
T1 - SY-XRF study of Hans Baldung Grien silverpoint drawings and the silver stylus from the 'Karlsruhe sketchbook'
N2 - We performed spatially resolved synchrotron-induced x-ray fluorescence analyses (SY-XRF) of five silverpoint drawings from the famous `Karlsruhe sketchbook´ and a silverpoint, which is assumed to be an original one used by the Renaissance artist Hans Baldung Grien (1484-1545) himself. The silverpoint, one out of a very small number of ancient styli conserved nowadays, is fixed on the so-called `Karlsruhe sketchbook´. Measurements were executed at the FLUO-TOPO beamline at the electron storage ring ANKA. It has been shown, that SY-XRF at this beamline is nondestructive and sensitive enough for the analysis of minor and major elements in the silver strokes. This study provides new insights into this graphical technique and ancient drawing instruments: results are that three drawings have been created with a common type of silverpoint containing about (10.4 ± 0.7) wt% of Cu. In all the cases, Hg at a 10% level by weight was identified in the strokes. Presence of Hg is not due to the original silver alloy, but is a result of a general alteration phenomenon of silverpoint drawings. This fact is confirmed by the analysis of the original silverpoint, which contains only small traces of Hg. The result for the copper content of the silverpoint (10.4 ± 1.7) wt% is in good agreement with that of these three drawings. It is supposable that the silverpoint found attached today served for the creation of the corresponding drawings. Moreover, the graphical technique of Baldung is found to be continual over three decades. Only one very late drawing dated to 1543 was probably realized with another silverpoint, containing about 3 wt% of Cu. This difference in the chemical composition of drawings from the late period might be used as a more precise dating indicator of Baldung drawings that are not clearly attributed to a certain period.
KW - Synchrotron
KW - XRF analysis
KW - Drawings
KW - Silver stylus
PY - 2007
DO - https://doi.org/10.1002/xrs.963
SN - 0049-8246
VL - 36
IS - 3
SP - 173
EP - 177
PB - Wiley
CY - Chichester
AN - OPUS4-16150
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Vasilescu, A.
A1 - Constantinescu, B.
A1 - Stan, D.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Buzanich, Günter
A1 - Ceccato, D.
T1 - Studies on ancient silver metallurgy using SR XRF and micro-PIXE
N2 - This work presents a complex evaluation of a series of Geto-Thracian silver adornments found on Romanian territory, part of the 4th century BC Agighiol (Northern Dobruja) hoard and of an ingot from the 1st century BC Geto-Dacian Surcea (Transylvania) hoard, using Synchrotron Radiation X-Ray Fluorescence and micro- Proton Induced X-ray Emission analysis and mapping in order to investigate aspects related to the elemental composition of the metal and the metallurgy implied in their manufacture. One of the samples can be linked to Laurion as the source of metal, and several items contain silver probably originated in Macedonia. The set of silver items was found to be heteregenous as composition and microstructure, and corrosion-related elements could be also identified in the X-Ray maps.
KW - Synchrotron radiation XRF
KW - Micro-PIXE
KW - Archaeological silver
PY - 2015
DO - https://doi.org/10.1016/j.radphyschem.2015.07.008
SN - 0969-806X
SN - 0020-7055
SN - 0146-5724
VL - 117
SP - 26
EP - 34
PB - Pergamon Press
CY - Oxford [u.a.] ; Frankfurt, M.
AN - OPUS4-33809
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Denker, A.
A1 - Hahn, Oliver
A1 - Kanngießer, B.
A1 - Malzer, W.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Röhrs, S.
A1 - Reiche, I.
A1 - Stege, H.
T1 - Chemie der Kunst - Zerstörungsfreie Analyse von Kunst- und Kulturgütern
N2 - Naturwissenschaftliche Informationen, insbesondere die chemische Zusammensetzung der Objekte, können Hinweise auf die Hintergründe der Objektherstellung liefern, die der alleinigen kunsthistorischen Begutachtung verborgen blieben. Es können nicht nur Fragen nach dem Prozess, Zeitpunkt und Ort der Herstellung beantwortet werden. Die chemische Analyse gibt auch Hinweise auf Ereignisse und Veränderungen, die erst nach der Fertigstellung des Objektes erfolgten. So werden Alterungsphänomene oder historische Überarbeitungen und Restaurierungen aufgedeckt, aber auch Konservierungsstrategien zur Erhaltung der Kunstwerke unterstützt. Durch den technologischen Fortschritt im Bereich der röntgenanalytischen Methoden, die berührungsfrei, ohne Probennahme und ohne Schädigung für das Untersuchungsobjekt arbeiten, erschließen sich dem Analytiker erstmalig Möglichkeiten, auch sehr wertvolle und fragile Objekte zerstörungsfrei zu untersuchen.
PY - 2003
DO - https://doi.org/10.1515/mt-2003-0003
SN - 0025-5300
VL - 45
IS - 11-12
SP - 485
EP - 503
PB - Carl Hanser Verlag
CY - München
AN - OPUS4-2745
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Qureshi, Navid
A1 - Morrow, Ryan
A1 - Eltoukhy, Samar
A1 - Grinenko, Vadim
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Onykiienko, Yevhen A.
A1 - Kulbakov, Anton
A1 - Inosov, Dmytro S.
A1 - Adler, Peter
A1 - Valldor, Martin
T1 - Noncollinear Magnetic Structures in the Chiral Antiperovskite β-Fe2SeO
N2 - We present the magnetic properties of the chiral, polar, andpossibly magnetoelectric antiperovskite β-Fe2SeO as derived from magnet-ization and specific-heat measurements as well as from powder neutrondiffraction and Mössbauer experiments. Our macroscopic data unambig-uously reveal two magnetic phase transitions at TN1 ≈ 103 K and TN2 ≈ 78K, while Rietveld analysis of neutron powder diffraction data reveals anoncollinear antiferromagnetic structure featuring magnetic moments inthe a−b plane of the trigonal structure and a ferromagnetic moment alongc. The latter is allowed by symmetry between TN1 and TN2, weakly visible inthe magnetization data yet unresolvable microscopically. While theintermediate phase can be expressed in the trigonal magnetic spacegroup P31, the magnetic ground state is modulated by a propagation vectorq = (1/2 1/2 0) resulting in triclinic symmetry and an even more complexlow-temperature spin arrangement which is also reflected in the Mö ssbauer hyperfine patterns indicating additional splitting of Fesites below TN2. The complex noncollinear spin arrangements suggest interesting magnetoelectric properties of this polar magnet.
KW - EXAFS
KW - Antiperovskite
KW - Magnetic structure
PY - 2024
DO - https://doi.org/10.1021/acs.inorgchem.4c02916
SN - 0020-1669
VL - 63
IS - 48
SP - 22712
EP - 22720
PB - American Chemical Society (ACS)
AN - OPUS4-63116
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Curado, Jessica
A1 - Radtke, Martin
A1 - Buzanich, Günter
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Guttler, R.A.S.
A1 - Rizzutto, M.A.
T1 - μ-SRXRF characterization of Brazilian emeralds
N2 - The aim of the present study is to characterize emeralds from different mines of Brazil by using Synchrotron Radiation X-ray Fluorescence Microanalysis (µ-SRXRF). The advantage of this technique is that we can analyze a homogeneous, inclusion free area of the stone with the microbeam to distinguish the elemental fingerprint according to the provenance of the emerald. A total of 47 samples belonging to 5 different Brazilian mines were studied in this work and 28 elements were identified. By means of Principal Component Analysis (PCA) it is possible to build different groups according to the provenance of the stones, which allows to assign samples of unknown origin to the according mine.
T2 - 22nd International congress on X-ray optics and microanalysis
CY - Hamburg, Germany
DA - 02.09.2013
KW - µ-SRXRF
KW - BAMline
KW - Emeralds
KW - Geoscience
PY - 2014
DO - https://doi.org/10.1088/1742-6596/499/1/012016
SN - 1742-6588
SN - 1742-6596
VL - 499
SP - 012016-1
EP - 012016-5
PB - IOP Publ.
CY - Bristol, UK
AN - OPUS4-30541
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Babutzka, Martin
A1 - Heyn, A.
T1 - Corrosion investigations by using gel-type electrolytes
N2 - Limitations are encountered regarding the electrolyte when studying atmospheric corrosion reactions on materials that form protective layers on their surface or tend to passivate. For example, the reconstruction of a thin wet film, as well as the interpretation of electrochemical measurements in so-called bulk solutions (a "mass" of electrolyte), often proves to be difficult in view of corrosion behavior under atmospheric conditions. A new approach to this problem in corrosion research includes the use of gel-type electrolytes as an alternative to bulk electrolytes. Gel-type electrolytes form a thin wet film on the surface of the material, whereby the naturally formed protective layer is affected similar to atmospheric conditions and can be examined in an almost non-destructive way. Through electrochemical instrumentation specific values such as polarization resistances and corrosion currents can be determined providing information on kinetics of surface layer formation and stability of surface layers formed under the influence of a thin wet film. Thus, new test methods can be developed that supply a better understanding of corrosion processes in specific atmospheres.
In this article different zinc coatings and aluminium alloys were investigated, their naturally formed protective layers were electrochemically characterized and corrosion relevant values were determined by using a gel pad based on polysaccharide. Corrosion relevant values allowed the differentiation of various coating systems and could describe the current protective effect provided by the coating. It is shown that gel-type electrolytes influence protective layers and coatings considerably less than corresponding bulk electrolytes and that an atmospheric wet film is approached by these test conditions. From the results it is evident that gel-type electrolytes represent a viable and promising field in corrosion research.
T2 - 18th Chemnitz Seminar on Materials Engineering – 18. Werkstofftechnisches Kolloquium
CY - Chemnitz, Germany
KW - Corrosion investigations
KW - Gel-type electrolytes
KW - Zinc coatings
PY - 2016
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-366680
DO - https://doi.org/10.1088/1757-899X/118/1/011002
VL - 118
SP - 17
PB - IOP Publishing
CY - Bristol, UK
AN - OPUS4-36668
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Merchel, Silke
A1 - Berger, Achim
A1 - Görner, Wolf
A1 - Radtke, Martin
A1 - Riesemeier, Heinrich
A1 - Reiche, I.
A1 - Riederer, J.
A1 - Duval, A.
A1 - Guicharnaud, H.
T1 - Non-Destructive Investigations of Dürer's Silver Point Drawings by Pixe and SY-XRF
T2 - 7th International Conference on Non-destructive testing and Microanalysis for the Diagnostics and Conservation of the Cultural and Environmental Heritage ; art 2002
CY - Antwerp, Belgium
DA - 2002-06-02
PY - 2002
UR - http://srs.dl.ac.uk/arch/publications/reiche/reiche_fullcorr.pdf
SP - 82
AN - OPUS4-1400
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
T1 - Traces of Albrecht Dürer: Non-destructive analyses of Renaissance silverpoint drawings
KW - Nuclear industry
KW - Nuclear medicine
PY - 2004
SN - 92-0-114703-1
SN - 0074-1876
IS - 1181
SP - 138
EP - 142
PB - IAEA
CY - Vienna
AN - OPUS4-5548
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
A1 - Roth, M.
ED - Röhrs, S.
T1 - Auf den Spuren Albrecht Dürers - Zerstörungsfreie Untersuchung von Silberstiftzeichnungen mittels Mikro-PIXE und Synchrotron-induzierter Mikro-RFA
T2 - Jahrestagung 2003 im Ethnologischen Museum Berlin-Dahlem
CY - Berlin, Deutschland
DA - 2003-03-12
PY - 2003
SN - 3-00-014223-1
SN - 0949-4057
SP - 118
EP - 120
CY - [Frankfurt am Main]
AN - OPUS4-2356
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Merchel, Silke
A1 - Berger, Achim
A1 - Görner, Wolf
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Vogl, Jochen
A1 - Frisch, A.
A1 - Reiche, I.
T1 - Kunst- und Kulturgüter unter "Beschuss"
T2 - GDCh-Jahrestagung Chemie 2003 ; Jahrestagung der Fachgruppe Nuklearchemie ; 19. Seminar Aktivierungsanalyse
CY - München, Deutschland
DA - 2003-10-06
PY - 2003
SN - 3-936028-14-1
N1 - Serientitel: Kurzreferate / GDCh-Jahrestagung Chemie 2003 – Series title: Kurzreferate / GDCh-Jahrestagung Chemie 2003
IS - 5
SP - 68
PB - Gesellschaft Deutscher Chemiker
CY - Frankfurt am Main
AN - OPUS4-2686
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Frisch, A.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Vogl, Jochen
ED - Röhrs, S.
T1 - Synchrotron-XRF und PIXE Untersuchungen an bronzezeitlichen Fussringen
T2 - Jahrestagung 2003 im Ethnologischen Museum Berlin-Dahlem
CY - Berlin, Deutschland
DA - 2003-03-12
PY - 2003
SN - 3-00-014223-1
SN - 0949-4057
SP - 101
EP - 103
CY - [Frankfurt am Main]
AN - OPUS4-2355
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
A1 - Roth, M.
ED - Marabelli, M.
ED - Tabaso, M.
T1 - Spatially resolved SR-XRF analyses of complex drawings of the Holbein family
T2 - 8th International Conference on "Non-Destructive Investigations and Microanalysis for the Diagnostics and Conservation of the Cultural and Environmental Heritage"
CY - Lecce, Italy
DA - 2005-05-15
KW - X-ray spectrometry
KW - XRF
KW - Röntgenfluoreszenzanalyse
KW - RFA
KW - Silverpoint drawing
KW - Silberstiftzeichnung
PY - 2005
SP - 7 pages
PB - Italian Society of Non Destructive Testing
CY - Lecce
AN - OPUS4-7677
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Berger, Achim
A1 - Calligaro, T.
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guerra, M.-F.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Reiche, I.
A1 - Riesemeier, Heinrich
A1 - Roth, M.
T1 - Study of Ag and Au based historical and archaeological objects by high energy Sy-XRF
KW - Synchrotron
KW - XRF analysis
KW - Drawings
KW - Archaeometry
KW - Gold
KW - Röntgenfluoreszenzanalyse
KW - RFA
KW - Zeichnungen
KW - Archäometrie
KW - Albrecht Dürer
KW - gold
PY - 2004
UR - http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/berichte/bessy/annualreport2003.pdf#page=544
SN - 0179-4159
SP - 544
EP - 546
PB - Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
CY - Berlin
AN - OPUS4-3507
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Bevers, H.
A1 - Dupuis, G.
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
A1 - Roth, M.
T1 - Spatially resolved SR-XRF analyses of complex drawings by the Holbein family and silverpoint drawings by Rembrandt
KW - X-ray spectrometry
KW - XRF
KW - Röntgenfluoreszenzanalyse
KW - RFA
KW - Silverpoint drawing
KW - Silberstiftzeichnung
PY - 2005
UR - http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/berichte/bessy/annualreport2004.pdf#page=491
SN - 0179-4159
SP - 491
EP - 493
PB - Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
CY - Berlin
AN - OPUS4-7380
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Armbruster, B.
A1 - Eilbracht, H.
A1 - Grüger, A.
A1 - Radtke, Martin
A1 - Riesemeier, Heinrich
A1 - Reiche, I.
T1 - The Vikings in Berlin: SR-XRF analyses of the Hiddensee gold jewellery
PY - 2005
UR - http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/infos/bessy/highlights2004.pdf#page=32
SN - 1611-6127
SP - 32
EP - 33
PB - Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
CY - Berlin
AN - OPUS4-7386
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Kanngießer, B.
A1 - Malzer, W.
A1 - Fuentes Rodriguez, A.
A1 - Reiche, I.
A1 - Voigt, F.
A1 - Radtke, Martin
T1 - 3D micro X-ray fluorescence spectroscopy - combining elemental analysis with chemical speciation
PY - 2004
UR - http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/berichte/bessy/annualreport2003.pdf#page=495
SN - 0179-4159
SP - 495
EP - 497
PB - Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
CY - Berlin
AN - OPUS4-3513
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
T1 - Metallstiftzeichnungen Albrecht Dürers
KW - Synchrotron
KW - XRF analysis
KW - Drawings
KW - Archaeometry
KW - Röntgenfluoreszenzanalyse (RFA)
KW - Zeichnungen
KW - Archäometrie
KW - Albrecht Dürer
PY - 2004
SN - 1563-2628
VL - 5
IS - 2
SP - 30
EP - 38
PB - Foto Text Verl.
CY - Stuttgart
AN - OPUS4-3570
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Denker, A.
A1 - Hahn, Oliver
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Kanngießer, B.
A1 - Malzer, W.
A1 - Röhrs, S.
A1 - Reiche, I.
A1 - Stege, H.
T1 - Röntgenanalytik für Kunstwerke und Kulturgüter
N2 - Naturwissenschaftler arbeiten mit Archäologen, Kunsthistorikern und Restauratoren zusammen, um Materialinformationen über Kunstwerke mit den Erkenntnissen aus Altertumsforschung, Kunstgeschichte und Denkmalpflege zu verbinden. Röntgenfluoreszenz und Röntgenemission sind die Methoden der Wahl, wenn wertvolle und fragile Objekte zerstörungsfrei zu untersuchen sind.
KW - Synchrotron
KW - XRF analysis
KW - Drawings
KW - Paintings
KW - Ink
KW - Art objects
KW - Archaeometry
KW - Röntgenfluoreszenzanalyse (RFA)
KW - Zeichnungen
KW - Gemälde
KW - Tinten
KW - Kunstobjekte
KW - Archäometrie
PY - 2005
SN - 1439-9598
SN - 1521-3854
VL - 53
IS - 2
SP - 118
EP - 123
PB - Wiley-VCH Verl.
CY - Weinheim
AN - OPUS4-6898
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
A1 - Roth, M.
ED - Denker, A.
ED - Adriaens, A.
ED - Dowsett, M.
ED - Giumlia-Mair, A.
T1 - Synchrotron radiation and protons on the traces of famous artists - Non-destructive analyses of silverpoint drawings by Albrecht Dürer
KW - X-ray spectrometry
KW - XRF
KW - Röntgenfluoreszenzanalyse
KW - RFA
KW - Silverpoint drawing
KW - Silberstiftzeichnung
PY - 2006
SN - 3-8167-7178-5
SP - 91
EP - 101
PB - Fraunhofer-IRB-Verl.
CY - Stuttgart
AN - OPUS4-14190
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Wolff, Timo
A1 - Hahn, Oliver
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Denker, A.
T1 - Four non-destructive X-Ray methods analyzing corroded coins: A self-critical comparison
T2 - Workshop Synchrotron Radiation in Art and Archaeology 2006
CY - Berlin, Germany
DA - 2006-09-27
PY - 2006
AN - OPUS4-14229
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - von Bohlen, A.
A1 - Hergenröder, R.
A1 - Sternemann, C.
A1 - Paulus, M.
A1 - Radtke, Martin
A1 - Riesemeier, Heinrich
T1 - Wavelenght Dispersive Synchrotron Microprobe Used for Material Analysis
N2 - Synchrotron radiation (SR) has been used in recent years as an excellent excitation source for X-ray fluorescence spectrometry. SR offers, in contrast to conventional X-ray sources, highly brilliant polychromatic, polarized radiation with which micro-domain X-ray fluorescence spectrometry becomes possible. A feasibility study of utility, conducted at BESSY (Berlin) and at DELTA (Dortmund), both synchrotron facilities of the third generation, to evaluate the use of wavelength dispersive X-ray fluorescence spectrometry in combination with synchrotron radiation is presented. First results for material analysis, obtained by combining the synchrotron radiation and a commercially available spectrometer commonly attached to a scanning electron microscope, are presented. The spectrometer, of the linear type, uses curved focusing Bragg-crystals of the Johann type which leads to a high spectral resolution up to 3 eV. Examples of micro-domain analyses are presented and compared with those obtained by synchrotron radiation induced energy dispersive X-ray fluorescence.
KW - Synchrotron radiation
KW - WDXRF
KW - EDXRF
KW - Micro analysis
KW - Material analysis
PY - 2005
DO - https://doi.org/10.1081/CI-200048048
SN - 1073-9149
SN - 1525-6030
VL - 33
IS - 2
SP - 137
EP - 150
PB - Dekker
CY - New York, NY
AN - OPUS4-14235
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Reifschneider, O.
A1 - Vennemann, A.
A1 - Buzanich, Günter
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Hogeback, J
A1 - Köppen, C.
A1 - Großgarten, M.
A1 - Sperling, M.
A1 - Wiemann, M.
A1 - Karst, U.
T1 - Revealing Silver Nanoparticle Uptake by Macrophages Using SR-μXRF and LA-ICP-MS
N2 - To better study the impact of nanoparticles on both in vitro and in vivo models, tissue distribution and cellular doses need to be described more closely. Here silver nanoparticles were visualized in alveolar macrophages by means of synchrotron radiation micro X-ray fluorescence spectroscopy (SR-μXRF) with high spatial resolution of 3 × 3 μm2. For the spatial allocation of silver signals to cells and tissue structures, additional elemental labeling was carried out by staining with eosin, which binds to protein and can be detected as bromine signal with SR-μXRF. The method was compatible with immunostaining of macrophage antigens. We found that the silver distribution obtained with SR-μXRF was largely congruent with distribution maps from a subsequent laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) of the same tissue sites. The study shows a predominant, though not exclusive uptake of silver into alveolar macrophages in the rat lung, which can be modeled by a similar uptake in cultured alveolar macrophages. Advantages and limitations of the different strategies for measuring nanoparticle uptake at the single cell level are discussed.
KW - Synchrotron
KW - BAMline
KW - XRF
KW - Nanoparticle
KW - Macrophagen
PY - 2020
DO - https://doi.org/10.1021/acs.chemrestox.9b00507
VL - 33
IS - 5
SP - 1250
EP - 1255
PB - American Chemical Society
AN - OPUS4-50855
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Vasilescu, A.
A1 - Constantinescu, B.
A1 - Bugoi, R.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Simon, R.
ED - Denecke, M.
ED - Walker, C.
T1 - Gold provenance studies for Romanian archaeological objects using micro-SR-XRF
N2 - Studies by Synchrotron Radiation-X-Ray Fluorescence (SR-XRF) for the search of the presence of trace elements like Sb, Sn, Te and Pb in archaeological metallic objects found on the territory of Romania-old coins and Bronze Age jewelry, aimed to determine the provenance of the gold used in their manufacture. The results are compared with the detailed elemental composition of alluvial or primary gold samples, obtained by the same technique. This work attempted to establish the origin of the gold used for the mint of two different types of koson coins. We found that the kosons with monogram are made of refined gold, while the one used for the kosons without monogram is mainly alluvial. The gold used in the manufacture of the Calarasi Vulchitrun-type disk and the Tauteu hair ring is also of alluvial origin.
T2 - 20th International congress on X-ray optics and microanalysis
CY - Karlsruhe, Germany
DA - 2009-09-14
KW - Provenance
KW - Gold
KW - SR-XRF
KW - Trace elements
PY - 2010
UR - http://link.aip.org/link/?APCPCS/1221/139/1
SN - 978-0-7354-0764-0
DO - https://doi.org/10.1063/1.3399240
SN - 0094-243X
SP - 139
EP - 143
PB - American Institute of Physics
AN - OPUS4-21182
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Constantinescu, B.
A1 - Vasilescu, A.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
T1 - A study on gold and copper provenance for Romanian prehistoric objects using micro-SR XRF
N2 - This study intends to clarify the metal provenance of gold archaeological items using the variation of the Au–Ag ratio and the presence of trace elements as Sn, Sb, Te, and Pb, concentrating on gold Dacian Koson coins, recovered recently. It also extends the area of our investigations to the copper provenance of Bronze Age artifacts—axes, sickles, and celts—found on Romanian territory. The experiments were performed by micro-SR XRF at BESSY Berlin, at the BAM-line facility. Two types of coins (Koson, with and without monogram) were analysed. The conclusions we reached were that most of the monogram coins are made from refined gold (3–5% Ag, less than 0.5% Cu), while the without monogram coins are made from native Transylvanian gold (9–20% Ag, 0.5–2% Cu), of alluvial origin, proved by the presence of Sn, Sb and Te embedded in the gold. The problem of provenance for prehistoric Romanian copper and bronze objects consists in linking their elemental compositional patterns to the ones of the Bronze Age regional mines from Bulgaria, Serbia or Transylvania, most likely used as ore sources for their manufacture. The studied samples present relevant traces of As, Ag, Sb, and Co, suggesting the most probable use of copper from Serbia or northern Bulgaria for their manufacture.
KW - X-ray fluorescence
KW - Synchrotron radiation
KW - Proton induced X-ray emission
KW - Archaeometry
KW - Gold
PY - 2011
DO - https://doi.org/10.1039/c0ja00215a
SN - 0267-9477
SN - 1364-5544
VL - 26
IS - 5
SP - 917
EP - 921
PB - Royal Society of Chemistry
CY - London
AN - OPUS4-23191
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Brücher, M.
A1 - von Bohlen, A.
A1 - Jacob, P.
A1 - Franzke, J.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Müller, Bernd R.
A1 - Scharf, Oliver
A1 - Hergenröder, R.
T1 - The charge of solid-liquid interfaces measured by X-ray standing waves and streaming current
N2 - Measurements of ion distributions at a charged solid–liquid interface using X-ray standing waves (XSW) are presented. High energy synchrotron radiation (17.48 keV) is used to produce an XSW pattern inside a thin water film on a silicon wafer. The liquid phase is an aqueous solution containing Br and Rb ions. The surface charge is adjusted by titration. Measurements are performed over a pH range from 2.2–9, using the native Si oxide layer and functional (amine) groups as surface charge. The Debye length, indicating the extension of the diffuse layer, could be measured with values varying between 1–4 nm. For functionalized wafers, the pH dependent change from attraction to repulsion of an ion species could be detected, indicating the isoelectric point. In combination with the measurement of the streaming current, the surface charge of the sample could be quantified.
KW - Interfacial charge
KW - Solid/liquid interfaces
KW - Surface analysis
KW - Surface functionalization
KW - X-ray spectrometry
KW - X-ray
KW - Standing waves
KW - XSW
KW - Streaming current
KW - Synchrotron radiation
PY - 2010
DO - https://doi.org/10.1002/cphc.201000166
SN - 1439-4235
SN - 1439-7641
VL - 11
IS - 10
SP - 2118
EP - 2123
PB - Wiley-VCH Verl.
CY - Weinheim
AN - OPUS4-22057
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Constantinescu, B.
A1 - Vasilescu, A.
A1 - Stan, D.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Buzanich, Günter
A1 - Ceccato, D.
A1 - Oberländer-Târnoveanu, E.
T1 - Studies on archaeological gold items found in Romanian territory using X-ray-based analytical spectrometry
N2 - This paper is an overview of the work developed by our group in the investigations of museum objects and alluvial gold, reflected in a series of studies published between 2000–2011, supplemented with new results, unpublished up-to-date. The X-ray based spectrometric techniques employed range from various X-Ray Fluorescence (XRF) investigations to ion beam analysis, including synchrotron radiation XRF and micro-Particle Induced X-ray Emission. The gold objects discussed are mainly part of the Sarmizegetusa Dacian hoards—spiraled bracelets (armbands) and coins. After obtaining in 2011 the permission of the Romanian authorities to take very small (1–2 mg) samples from the most 'unimportant' areas of the Dacian bracelets and several Koson staters, to analyze them by micro-SR-XRF at BESSY, in February 2012, the investigation of several micro-areas of 17 stater and 28 bracelet samples revealed important micro-structural inhomogeneity, especially in Sn and Cu. The same inhomogeneous micro-structure has been seen in Transylvanian alluvial gold. The analyses revealed details on the fingerprint of geological gold deposits and also the main characteristics of ancient gold metallurgy procedures used by the Dacians: a relatively low temperature (lower than Au melting point) and hammering during heating to obtain an ingot through sintering. The use of the sintering procedure was proved for the spiraled bracelets and the Koson without monogram coins, a tradition starting in the Bronze Age in Transylvanian gold processing. The existence of micro-inclusions of Ta-minerals in alluvial gold was also detected, explaining Ta trace presence in the artifacts from the Pietroasa hoard.
KW - Micro-SR-XRF
KW - Micro-PIXE
KW - Archaeometry
KW - Gold
KW - Romania
PY - 2012
DO - https://doi.org/10.1039/c2ja30158j
SN - 0267-9477
SN - 1364-5544
VL - 27
IS - 12
SP - 2076
EP - 2081
PB - Royal Society of Chemistry
CY - London
AN - OPUS4-26991
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Niemeyer, B.
A1 - Schwarzmaier, A.
A1 - Radtke, Martin
A1 - Hahn, Oliver
T1 - Archaische Goldarbeiten aus Kleinasien in der Berliner Antikensammlung – Herstellungstechnik, Materialanalytik und der Fundkomplex »aus Ephesos«
N2 - Ein Konvolut einzelner Schmuckstücke und die Goldbeigaben eines angeblichen Grabfundes wurden technologisch und analytisch untersucht. Die meisten Objekte sind Blecharbeiten, die aus einer Vielzahl von Einzelteilen mit metallischem Goldlot zusammengefügt und mit Granulation oder granulations-imitierendem Perl- oder Kerbdraht verziert wurden. Nur vier kleine Ohrringe sind massiv gegossen.
Zwei Zierbleche dürften über Patrizen (Positivmodeln), die Deckel der Astragale in Matrizen (Negativmodeln) geformt worden sein. Alle Objekte wurden mit Synchrotron- und atmosphärischer Röntgenfluoreszenz analysiert. Die Daten zeigen das breite Spektrum an Goldlegierungen, die im 7./6. Jahrhundert v. Chr. in Kleinasien verarbeitet wurden: vom natürlichen Seifengold (Elektrum) bis zu geläutertem, fast reinem Gold. Eine Korrelation zwischen Goldqualität und Verarbeitungsmethode konnte nicht festgestellt werden. Sowohl hochreines als auch mit viel Silber und Kupfer legiertes Gold wurde zum Schmieden von Blecharbeiten, aber auch zum Massivguss verwendet. Aus der Goldfarbe kann wegen des Phänomens der oberflächlichen Goldanreicherung nicht auf eine Legierungszusammensetzung geschlossen werden. Der 1963 angekaufte Fundkomplex aus lydischen Metallarbeiten und ostionischen Salbgefäßen aus Ton dürfte einen Grabfund des frühen 6. Jahrhunderts v. Chr. darstellen, dessen Herkunft aus Ephesos jedoch nicht zu sichern ist.
KW - Gold
KW - Synchrotron
KW - XRF
PY - 2017
SN - 1866-7007
VL - 9
SP - 57
EP - 83
PB - RGZM. Archäologische Staatssammmlung München
CY - München
AN - OPUS4-42986
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Constantinescu, B.
A1 - Vasilescu, A.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
T1 - Micro-SR-XRF studies for archaeological gold identification - the case of carpathian gold and romanian museal objects
N2 - In the determination of the provenance of gold in archaeological artifacts, trace elements are more significant than the main components. Several minute fragments of natural Carpathian gold-placer and primary-and some very small (a few milligrams) fragments of archaeological items were studied using micro Synchrotron Radiation X-Ray Fluorescence (micro SR-XRF) at the BESSY Synchrotron Facility in Berlin, Germany. The goal of the study was to identify the trace elements characterizing Carpathian gold, looking especially at Sn, Sb, Pb and Te, and to determine if the gold in the archaeological items is native or refined. Applications to the authentication and provenance of nine Dacian gold bracelets, koson coins and two Bronze Age items are presented.
KW - Gold
KW - Provenance
KW - Archeometry
KW - Sy-XRF
PY - 2010
DO - https://doi.org/10.1007/s00339-010-5624-1
SN - 0947-8396
VL - 99
IS - 2
SP - 383
EP - 389
PB - Springer
CY - Berlin
AN - OPUS4-21395
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Constantinescu, B.
A1 - Vasilescu, A.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Pacheco, C.
A1 - Pichon, L.
A1 - Oberländer-Târnoveanu, E.
T1 - SR XRF and micro-PIXE studies on ancient metallurgy of thirteen Dacian gold bracelets
N2 - A thorough microscopic investigation by SR XRF and micro-PIXE brings insight into the probable techniques used in the manufacture of thirteen Dacian gold bracelets, one of the most spectacular archaeological finds ever on the territory of Romania.
KW - Micro-SR-XRF
KW - Micro-PIXE
KW - Archaeometry
KW - Gold
KW - Romania
PY - 2012
DO - https://doi.org/10.1007/s00339-012-7306-7
SN - 0947-8396
VL - 109
IS - 2
SP - 395
EP - 402
PB - Springer
CY - Berlin
AN - OPUS4-26902
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Babutzka, Martin
A1 - Heyn, A.
T1 - Dynamic tafel factor adaption for the evaluation of instantaneous corrosion rates on zinc by using gel-type electrolytes
N2 - The paper presents a new method for the determination and evaluation of tafel factors using gel-type electrolytes and electrochemical frequency modulation technique (EFM). This relatively new electrochemical method offers the possibility to determine both polarization resistances and tafel factors within one measurement and in short measuring intervals. Starting from a comprehensive parameter study it is shown that a direct relationship between the two values exists that can be described mathematically. This contribution presents the determined tafel factors for the system gel-type electrolyte/zinc and discusses their applicability and their limits.
T2 - 19th Chemnitz Seminar on Materials Engineering – 19. Werkstofftechnisches Kolloquium
CY - Chemnitz, Germany
DA - 16.03.2017
KW - Gel-type electrolytes
KW - Gelartige Elektrolyte
KW - Zinc
KW - Zink
KW - Stern Geary constant
KW - Stern-Geary-Konstante
PY - 2017
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-394324
UR - http://iopscience.iop.org/article/10.1088/1757-899X/181/1/012021/pdf
DO - https://doi.org/10.1088/1757-899X/181/1/012021
SN - 1757-899X
SN - 1757-8981
VL - 181
IS - Conference 1
SP - Article UNSP 012021, 1
EP - 11
PB - IOP Publishing
CY - Bristol, UK
AN - OPUS4-39432
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Menzel, M.
A1 - Scharf, O.
A1 - Novak, S.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Hischenhuber, P.
A1 - Buzanich, Günter
A1 - Meyer, A.
A1 - Lopez, V.
A1 - McIntosh, K.
A1 - Streli, C.
A1 - Havrilla, G.
A1 - Fittschen, U.
T1 - Shading in TXRF: calculations and experimental validation using a color X-ray camera
N2 - Absorption effects in total reflection X-ray fluorescence (TXRF) analysis are important to consider, especially if external calibration is to be applied. With a color X-ray camera (CXC), that enables spatially and energy resolved XRF analysis, the absorption of the primary beam was directly visualized for mL-droplets and an array of pL-droplets printed on a Si-wafer with drop-on-demand technology. As expected, deposits that are hit by the primary beam first shade subsequent droplets, leading to a diminished XRF signal. This shading effect was quantified with enhanced precision making use of sub-pixel analysis that improves the spatial resolution of the camera. The measured absorption was compared to simulated results using three different model calculations. It was found they match very well (average deviation < 10%). Thus errors in quantification due to absorption effects can be accounted for in a more accurate manner.
KW - absorption
KW - X-ray Fluorescence analysis
PY - 2015
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-359000
DO - https://doi.org/10.1039/C5JA00127G
IS - 10
SP - 2184
EP - 2193
PB - Royal Society of Chemistry
CY - Cambridge
AN - OPUS4-35900
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Hahn, Oliver
A1 - Denker, A.
A1 - Merchel, S.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Wolff, T.
ED - Armbruster, B.
ED - Eilbracht, H.
ED - Hahn, Oliver
ED - Heinrich-Tamaska, O.
T1 - Zerstörungsfreie Analyse von Metallartefakten - Eine Fallstudie
N2 - Die naturwissenschaftliche Analyse historischer Materialen ermöglicht die Beantwortung kulturhistorischer Fragestellungen, die mit kunsthistorischen oder archäologischen Ansätzen allein nicht zu leisten sind. In dieser Studie wurden sechs römische Münzen mit unterschiedlich stark ausgeprägten Korrosionsschichten an unbehandelten und polierten Stellen mit vier zerstörungsfreien analytischen Methoden untersucht: Hoch- und Niederenergie Protonen Induzierter Röntgenemission (HE-/PIXE), Synchrotronstrahlungsinduzierte-Röntgenfluoreszenzanalyse (SY-RFA) und Mikro-Röntgenfluoreszenzanalyse (Mikro-RFA) mit einem mobilen Gerät. Aufgrund von Unterschieden in den Messbedingungen und dem Einfluss der Patina-Schichten auf diese ergaben sich nur für wenige Elemente Übereinstimmungen in den quantitativen Daten. Zur Validierung zukünftiger Messkampagnen mit verschiedenen Methoden sind daher Vergleichstudien unerlässlich.
N2 - Investigations of physical properties and chemical composition of ancient materials generate important data for answering culture-historical questions that cannot be solved by art historical and archaeological methods alone. This contribution reports on the analysis of six Roman coins, with different degrees of corrosion layers in parts that were not handled or polished, using four non-destructive methods: low-energy particle-induced X-ray emission (PIXE, 2 MeV), high-energy PIXE (68 MeV), μ-X-ray fluorescence (XRF) spectrometry with a portable device and synchrotron-radiation induced XRF. Because of differences in the conditions needed for measurement and the influence of the layers of patina on these measurements, there were few elements where the quantitative data were in agreement. Thus comparative analyses are essential to validate future measurement projects using different methods.
KW - Zerstörungsfreie Prüfung
KW - Protoneninduzierte Röntgenemission
KW - Röntgenfluoreszenzanalyse
KW - Non-destructive testing
KW - Particle-induced X-ray emission
KW - X-ray fluorescence analysis
PY - 2016
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-385702
SN - 978-3-9816751-5-3
VL - Berlin studies of the ancient world, Band 35
SP - 117
EP - 137
PB - Edition Topoi
CY - Berlin
AN - OPUS4-38570
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Hachmöller, O.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Aichler, M.
A1 - Radtke, Martin
A1 - Dietrich, D.
A1 - Schwamborn, K.
A1 - Lutz, L.
A1 - Werner, M.
A1 - Sperling, M.
A1 - Walch, A.
A1 - Karst, U.
T1 - Elemental bioimaging and speciation analysis for the investigation of Wilsons disease using μXRF and XANES
N2 - A liver biopsy specimen from a Wilson’s disease (WD) patient was analyzed by means of micro-X-ray fluorescence (mXRF) spectroscopy to determine the elemental distribution. First, bench-top mXRF was utilized for a coarse scan of the sample under laboratory conditions. The resulting distribution maps of copper and iron enabled the determination of a region of interest (ROI) for further analysis. In order to obtain more detailed elemental information, this ROI was analyzed by synchrotron radiation (SR)-based mXRF with a beam size of 4 mm offering a resolution at the cellular level. Distribution maps of additional elements to copper and iron like zinc and manganese were obtained due to a higher sensitivity of SR-mXRF. In addition to this, X-ray absorption near edge structure spectroscopy (XANES) was performed to identify the oxidation states of copper in WD. This speciation analysis indicated a mixture of copper(I) and copper(II) within the WD liver tissue.
KW - progressive hepatolenticular degeneration
KW - mXRF Micro-X-ray fluorescence spectroscopy
KW - XANES X-ray absorption near edge structure spectroscopy
PY - 2016
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-360811
DO - https://doi.org/10.1039/C6MT00001K
SN - 1756-5901
SN - 1756-591X
PB - Royal Society of Chemistry
CY - Cambridge
AN - OPUS4-36081
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - de O. Primo, J.
A1 - Horsth, D.F.
A1 - de S. Correa, J.
A1 - Das, A.
A1 - Bittencourt, C.
A1 - Umek, P.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Yusenko, Kirill
A1 - Zanetta, C.
A1 - Anaissi, F.J.
T1 - Synthesis and Characterization of Ag/ZnO Nanoparticles for Bacteria Disinfection in Water
N2 - n this study, two green synthesis routes were used for the synthesis of Ag/ZnO nanoparticles, using cassava starch as a simple and low-cost effective fuel and Aloe vera as a reducing and stabilizing agent. The Ag/ZnO nanoparticles were characterized and used for bacterial dis-
infection of lake water contaminated with Escherichia coli (E. coli). Characterization indicated the formation of a face-centered cubic structure of metallic silver nanoparticles with no insertion of Ag into the ZnO hexagonal wurtzite structure. Physicochemical and bacteriological analyses described in “Standard Methods for the Examination of Water and Wastewater” were used to evaluate the efficiency of the treatment. In comparison to pure ZnO, the synthesized Ag/ZnO nanoparticles showed high efficiencies against Escherichia coli (E. coli) and general coliforms present in the lake
water. These pathogens were absent after treatment using Ag/ZnO nanoparticles. The results indicate that Ag/ZnO nanoparticles synthesized via green chemistry are a promising candidate for the treatment of wastewaters contaminated by bacteria, due to their facile preparation, low-cost synthesis,and disinfection efficiency.
KW - Synchrotron
KW - BAMline
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-562440
DO - https://doi.org/10.3390/nano12101764
SN - 2079-4991
VL - 12
IS - 10
SP - 1
EP - 18
PB - MDPI
CY - Basel
AN - OPUS4-56244
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Grengg, C.
A1 - Gluth, Gregor
A1 - Mittermayr, F.
A1 - Ukrainczyk, N.
A1 - Bertmer, M.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Leis, A.
A1 - Dietzel, M.
T1 - Deterioration mechanism of alkali-activated materials in sulfuric acid and the influence of Cu: A micro-to-nano structural, elemental and stable isotopic multi-proxy study
N2 - In this study, a multi-proxy approach combining 29Si, 27Al and 1H MAS-NMR, FEG-EPMA, XANES at the Cu K-edge and XRD analytics with hydrochemical tools such as ICP-OES analyses, oxygen-isotope signatures, and thermodynamic modelling was applied to K-silicate-activated metakaolin specimens - with and without CuSO4·5H2O addition - exposed to sulfuric acid at pH = 2 for 35 days. The results revealed a multistage deterioration mechanism governed by (i) acid diffusion, (ii) leaching of K-A-S-H, (iii) microstructural damage related to precipitation of expansive (K,Ca,Al)-sulfate-hydrate phases (iv) complete dissolution of the K-A-S-H framework, (v) and formation of silica gel in the outermost corroded regions. Copper ions were mainly located in layered spertiniite-chrysocolla-like phases in the as-cured materials. The results demonstrate an overall negative effect of Cu addition on chemical material durability, implying that the reported higher durability of Cu-doped AAM in biocorrosion environments can be best explained by bacteriostatic effects.
KW - Alkali-activated materials
KW - Acid resistance
KW - Microbially induced corrosion
KW - MIC
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-520567
DO - https://doi.org/10.1016/j.cemconres.2021.106373
SN - 0008-8846
VL - 142
SP - 1
EP - 15
PB - Elsevier
CY - Oxford
AN - OPUS4-52056
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Radtke, Martin
A1 - Fittschen, U. E. A.
T1 - Shading Effects in SR-TXRF: Calculations and Experimental Visualization using a Color X-ray Camera
T2 - Denver X-ray Conference
CY - BIG SKY RESORT, BIG SKY, MONTANA, USA
DA - 2014-07-28
PY - 2014
AN - OPUS4-32371
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Lutz, C.
A1 - Breuckmann, M.
A1 - Hampel, S.
A1 - Kreyenschmidt, M.
A1 - Ke, X.
A1 - Beuermann, S.
A1 - Schafner, K.
A1 - Turek, T.
A1 - Kunz, U.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Fittschen, U. E. A.
T1 - Characterization of Dimeric Vanadium Uptake and Species in Nafion™ and Novel Membranes from Vanadium Redox Flow Batteries Electrolytes
N2 - A core component of energy storage systems like vanadium redox flow batteries (VRFB) is the polymer electrolyte membrane (PEM). In this work, the frequently used perfluorosulfonic-acid (PFSA) membrane Nafion™ 117 and a novel poly (vinylidene difluoride) (PVDF)-based Membrane are investigated. A well-known problem in VRFBs is the vanadium permeation through the membrane. The consequence of this so-called vanadium crossover is a severe loss of capacity. For a
better understanding of vanadium transport in membranes, the uptake of vanadium ions from electrolytes containing Vdimer(IV–V) and for comparison also V(II), V(III), V(IV), and V(V) by both membranes was studied. UV/VIS spectroscopy, X-ray absorption near edge structure spectroscopy (XANES), total reflection X-ray fluorescence spectroscopy (TXRF), inductively coupled plasma optical emission spectrometry (ICP-OES), and micro X-ray fluorescence spectroscopy (microXRF) were used to determine the vanadium concentrations and the species inside the membrane. The results strongly support that Vdimer(IV–V), a dimer formed from V(IV) and V(V), enters the nanoscopic water-body of Nafion™ 117 as such. This is interesting, because as of now, only the individual ions V(IV) and V(V) were considered to be transported through the membrane. Additionally, it was found that the Vdimer(IV–V) dimer partly dissociates to the individual ions in the novel PVDF-based membrane.
The Vdimer(IV–V) dimer concentration in Nafion™ was determined and compared to those of the other species. After three days of equilibration time, the concentration of the dimer is the lowest compared to the monomeric vanadium species. The concentration of vanadium in terms of the relative uptake λ = n(V)/n(SO3
) are as follows: V(II) [λ = 0.155] > V(III) [λ = 0.137] > V(IV) [λ = 0.124] > V(V) [λ = 0.053] > Vdimer(IV–V) [λ = 0.039]. The results show that the Vdimer(IV–V) dimer Needs to be considered in addition to the other monomeric species to properly describe the transport of vanadium through Nafion™ in VRFBs.
KW - MicroXRF
KW - VRFB
KW - PVDF-based membrane
KW - UV/VIS
KW - XANES
KW - TXRF
KW - ICP-OES
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-530676
DO - https://doi.org/10.3390/membranes11080576
VL - 11
IS - 8
SP - 576
PB - MDPI
AN - OPUS4-53067
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - C. Pardo Pérez, L.
A1 - Arndt, A.
A1 - Stojkovikj, S.
A1 - Y. Ahmet, I.
A1 - T. Arens,, J.
A1 - Dattila, F.
A1 - Wendt, R.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Davies, V.
A1 - Höflich, K.
A1 - Köhnen, E.
A1 - Tockhorn, P.
A1 - Golnak, R.
A1 - Xiao, J.
A1 - Schuck, G.
A1 - Wollgarten, M.
A1 - López, N.
A1 - T. Mayer, M.
T1 - Determining Structure-Activity Relationships in Oxide Derived CuSn Catalysts During CO2 Electroreduction Using X-Ray Spectroscopy
N2 - The development of earth-abundant catalysts for selective electrochemical CO2 conversion is a central challenge. Cu-Sn bimetallic catalysts can yield selective CO2 reduction toward either CO or formate. This study presents oxide-derived Cu-Sn catalysts tunable for either product and seeks to understand the synergetic effects between Cu and Sn causing these selectivity trends. The materials undergo significant transformations under CO2 reduction conditions, and their dynamic bulk and surface structures are revealed by correlating observations from multiple methods—X-ray absorption spectroscopy for in situ study, and quasi in situ X-ray photoelectron spectroscopy for surface sensitivity. For both types of catalysts, Cu transforms to metallic Cu0 under reaction conditions. However, the Sn speciation and content differ significantly between the catalyst types: the CO-selective catalysts exhibit a surface Sn content of 13 at. % predominantly present as oxidized Sn, while the formate-selective catalysts display an Sn content of ≈70 at. % consisting of both metallic Sn0 and Sn oxide species. Density functional theory simulations suggest that Snδ+ sites weaken CO adsorption, thereby enhancing CO selectivity, while Sn0 sites hinder H adsorption and promote formate production. This study reveals the complex dependence of catalyst structure, composition, and speciation with electrochemical bias in bimetallic Cu catalysts.
KW - Electrochemical CO2 conversion
KW - Cu catalysts
KW - X-ray absorption spectroscopy
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-547116
DO - https://doi.org/10.1002/aenm.202103328
SN - 1614-6832
VL - 12
IS - 5
SP - 2103328
PB - Wiley-VCH GmbH
AN - OPUS4-54711
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Radtke, Martin
A1 - Rakotondrajoa, A.
T1 - Machine learning based quantification of synchrotron radiation-induced X-ray fluorescence measurements - a case study
N2 - In this work, we describe the use of artificial neural networks for the quantification of X-ray fluorescence measurements. The training data were generated using Monte Carlo simulation, which avoided the use of adapted reference materials. The extension of the available data set by means of an ANN to generate additional data was demonstrated. Particular emphasis was put on the comparability of simulated and experimental data and how the influence of deviations can be reduced. The search for the optimal hyperparameter, manual and automatic, is also described. For the presented case, we were able to train a network with a mean absolute error of 0.1 weight percent for the synthetic data and 0.7 weight percent for a set of experimental data obtained with certified reference materials.
KW - Machine learning
KW - BAMline
KW - XRF
KW - Synchrotron
KW - Neural network
PY - 2020
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-519008
DO - https://doi.org/10.1088/2632-2153/abc9fb
SP - 1
EP - 16
PB - IOP Publishing
AN - OPUS4-51900
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Ha, Q. L. M.
A1 - Armbruster, U.
A1 - Atia, Hanan
A1 - Lund, H.
A1 - Agostini, G.
A1 - Radnik, Jörg
A1 - Vuong, H. T.
A1 - Martin, A.
T1 - Development of active and stable low nickel content catalysts for dry reforming of methane
N2 - Methane dry reforming (DRM) was investigated over highly active Ni catalysts with low metal content (2.5wt%) supported on Mg-Al mixed oxide. The aim was to minimize carbon Deposition and metal sites agglomeration on the working catalyst which are known to cause catalyst deactivation.
The solids were characterized using N2 adsorption, X-ray diffraction, temperature-programmed reduction, X-ray photoelectron spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The results showed that MgO-Al2O3 solid solution phases are obtained when calcining Mg-Al hydrotalcite precursor in the temperature range of 550–800 °C. Such phases contribute to the high activity of catalysts with low Ni content even at low temperature (500 °C). Modifying the catalyst preparation with citric acid significantly slows the coking rate and reduces the size of large octahedrally coordinated NiO-like domains, which may easily agglomerate on the surface during DRM. The most effective Ni catalyst shows a stable DRM course over 60 h at high weight hourly space velocity with very low coke deposition. This is a promising result for considering such catalyst systems for further development of an industrial DRM technology.
KW - Dry reforming of methane
KW - Carbon dioxide
KW - Ni
PY - 2017
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-402904
DO - https://doi.org/10.3390/catal7050157
SN - 2073-4344
VL - 7
IS - 5
SP - 157, 1
EP - 157, 17
PB - MDPI
AN - OPUS4-40290
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Steglich, P.
A1 - Rabus, D. G.
A1 - Sada, C.
A1 - Paul, Martin
A1 - Weller, Michael G.
A1 - Mai, C.
A1 - Mai, A.
T1 - Silicon Photonic Micro-Ring Resonators for Chemical and Biological Sensing: A Tutorial
N2 - Silicon photonic micro-ring resonators (MRR) developed on the silicon-on-insulator (SOI) platform, owing to their high sensitivity and small footprint, show great potential for many chemical and biological sensing applications such as label-free detection in environmental monitoring, biomedical engineering, and food analysis. In this tutorial,we provide the theoretical background and give design guidelines for SOI-based MRR as well as examples of surface functionalization procedures for label-free detection of molecules. After introducing the advantages and perspectives of MRR, fundamentals of MRR are described in detail, followed by an introduction to the fabrication methods, which are based on a complementary metal-oxide semiconductor (CMOS) technology. Optimization of MRR for chemical and biological sensing is provided, with special emphasis on the optimization of waveguide geometry. At this point, the difference between chemical bulk sensing and label-free surface sensing is explained, and definitions like waveguide sensitivity, ring sensitivity, overall sensitivity as well as the limit of detection (LoD) of MRR are introduced. Further, we show and explain chemical bulk sensing of sodium chloride (NaCl) in water and provide a recipe for label-free surface sensing.
KW - Biosensors
KW - Biophotonics
KW - Chemosensor
KW - Biosensor
KW - Microresonator
KW - Nanophotonics
KW - Optical sensors
KW - Photonic sensors
KW - Optoelectronic
KW - Ring resonator
KW - Silicon photonics
KW - Miniaturization
KW - Lab-on-a-chip
KW - Lab-on-chip
KW - Waveguide
KW - Surface chemistry
KW - Silanization
KW - Glutaraldehyde
KW - Affinity immobilization
KW - Antibody
KW - Oriented immobilization
KW - Real-time measurement
PY - 2022
DO - https://doi.org/10.1109/JSEN.2021.3119547
SN - 1530-437X
VL - 22
IS - 11
SP - 10089
EP - 10105
PB - IEEE
AN - OPUS4-55147
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Bornemann-Pfeiffer, Martin
A1 - Wolf, Jakob
A1 - Meyer, Klas
A1 - Kern, S.
A1 - Angelone, D.
A1 - Leonov, A.
A1 - Cronin, L.
A1 - Emmerling, Franziska
T1 - Standardization and control of Grignard reactions in a universal chemical synthesis machine using online NMR
T1 - Standardisierung und Kontrolle von Grignard-Reaktionen mittels Online-NMR in einer universellen chemischen Syntheseplattform
N2 - A big problem with the chemistry literature is that it is not standardized with respect to precise operational parameters, and real time corrections are hard to make without expert knowledge. This lack of context means difficult reproducibility because many steps are ambiguous, and hence depend on tacit knowledge. Here we present the integration of online NMR into an automated chemical synthesis machine (CSM aka. “Chemputer” which is capable of small-molecule synthesis using a universal programming language) to allow automated analysis and adjustment of reactions on the fly. The system was validated and benchmarked by using Grignard reactions which were chosen due to their importance in synthesis. The system was monitored in real time using online-NMR, and spectra were measured continuously during the reactions. This shows that the synthesis being done in the Chemputer can be dynamically controlled in response to feedback optimizing the reaction conditions according to the user requirements.
N2 - Ein Problem der chemischen Literatur ist die fehlende Standardisierung bezüglich genauer Bedingungen, auch Echtzeit-Korrekturen sind ohne Expertenwissen nur schwer möglich. Dieser Mangel an Details erschwert experimentelle Reproduzierbarkeit, da Schritte oft mehrdeutig sind und daher von implizitem Wissen abhängen. Hier präsentieren wir die Integration von Online-NMR Spektroskopie in eine automatisierte chemische Syntheseplattform (CSM aka. “Chemputer”, unter Verwendung einer universellen Programmiersprache zur Synthese kleiner Moleküle fähig), um eine automatisierte Analyse und Anpassung von Reaktionen im laufenden Betrieb zu ermöglichen. Das System wurde anhand von Grignard-Reaktionen, die aufgrund ihrer Bedeutung für die Synthese ausgewählt wurden, validiert und einem Härtetest unterzogen. Synthesen wurden in Echtzeit mit Online-NMR überwacht, und die Spektren wurden während der Reaktionen kontinuierlich aufgenommen und analysiert. Dies zeigt, dass der Chemputer dynamisch mittels einer Regelung kontrolliert werden kann, um die Reaktionsbedingungen entsprechend den Anforderungen des Benutzers zu optimieren.
KW - Grignard reaction
KW - NMR spectroscopy
KW - Process analytical technology
KW - Process control
KW - Grignard-Reaktion
KW - NMR-Spektroskopie
KW - Prozessanalytik
KW - Prozesskontrolle
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-531260
DO - https://doi.org/10.1002/anie.202106323
SN - 1521-3773
SN - 1433-7851
N1 - Bibliografische Angaben für die deutsche Version: Angewandte Chemie 2021, Jg. 133, S. 1–7, ISSN 0044-8249, ISSN 1521-3757, https://doi.org/10.1002/ange.202106323 - Bibliographic information for the German version: Angewandte Chemie 2021, vol. 133, p. 1–7, ISSN 0044-8249, ISSN 1521-3757, https://doi.org/10.1002/ange.202106323
VL - 60
IS - 43
SP - 1
EP - 6
PB - Wiley-VCH
CY - Weinheim
AN - OPUS4-53126
LA - mul
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Steglich, P.
A1 - Bondarenko, S.
A1 - Mai, C.
A1 - Paul, Martin
A1 - Weller, Michael G.
A1 - Mai, A.
T1 - CMOS-Compatible Silicon Photonic Sensor for Refractive Index Sensing Using Local Back-Side Release
N2 - Silicon photonic sensors are promising candidates for lab-on-a-chip solutions with versatile applications and scalable production prospects using complementary metal-oxide semiconductor (CMOS) fabrication methods. However, the widespread use has been hindered because the sensing area adjoins optical and electrical components making packaging and sensor handling challenging. In this work, a local back-side release of the photonic sensor is employed, enabling a separation of the sensing area from the rest of the chip. This approach allows preserving the compatibility of photonic integrated circuits in the front-end of line and metal interconnects in the back-end of line. The sensor is based on a micro-ring resonator and is fabricated on wafer-level using a CMOS technology. We revealed a ring resonator sensitivity for homogeneous sensing of 106 nm/RIU.
KW - Photonic biosensor
KW - Lab-on-a-chip
KW - Ring resonator
KW - Resonance wavelength shift
KW - PIC technology
KW - Back-side integration
PY - 2020
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-517139
DO - https://doi.org/10.1109/LPT.2020.3019114
VL - 32
IS - 19
SP - 1241
EP - 1244
PB - IEEE
AN - OPUS4-51713
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Steglich, P.
A1 - Mai, C.
A1 - Bondarenko, S.
A1 - Paul, Martin
A1 - Weller, Michael G.
A1 - Schrader, S.
A1 - Mai, A.
T1 - BioPIC - Integration of Biosensors based on Photonic Integrated Circuits by Local-Backside Etching
N2 - Silicon photonic sensors are promising candidates for lab-on-a-chip solutions with versatile applications and scalable production prospects using complementary metal-oxide semiconductor (CMOS) fabrication methods. However, the widespread use has been hindered because the sensing area adjoins optical and electrical components making packaging and sensor handling challenging. In this work, a local back-side release of the photonic sensor is employed, enabling a separation of the sensing area from the rest of the chip. This approach allows preserving the compatibility of photonic integrated circuits in the front-end of line and metal interconnects in the back-end of line.
T2 - ATTRACT online Conference
CY - Online meeting
DA - 22.09.2020
KW - Silicon Photonics
KW - Photonic Sensor
KW - Photonic Integrated Circuits
KW - Point-Of-Care-Diagnostics
KW - CMOS
KW - Microfluidics
KW - Lab-on-a-chip
KW - Ring resonator
PY - 2020
UR - https://attract-eu.com/showroom/project/integration-of-biosensors-based-on-photonic-integrated-circuits-by-local-backside-etching-biopic/
SP - 1
EP - 5
AN - OPUS4-51735
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Senges, Gene
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Lindič, Tilen
A1 - Gully, Tyler A.
A1 - Winter, Marlon
A1 - Radtke, Martin
A1 - Röder, Bettina
A1 - Steinhauer, Simon
A1 - Paulus, Beate
A1 - Emmerling, Franziska
A1 - Riedel, Sebastian
T1 - Unravelling highly oxidized nickel centers in the anodic black film formed during the Simons process by in situ X-ray absorption near edge structure spectroscopy
N2 - The electrofluorination after Simons has been used for the last century to produce everyday life materials. An in situ XANES investigation of the controversially debated black film apparent in the Simons process revealed high-valent nickel centers.
KW - Synchrotron
KW - BAMline
KW - XANES
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-608366
DO - https://doi.org/10.1039/d3sc06081k
SN - 2041-6520
VL - 15
IS - 12
SP - 4504
EP - 4509
PB - Royal Society of Chemistry (RSC)
AN - OPUS4-60836
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Steglich, P.
A1 - Rabus, D. G.
A1 - Sada, C.
A1 - Paul, Martin
A1 - Weller, Michael G.
A1 - Mai, C.
A1 - Mai, A.
T1 - Silicon Photonic Micro-Ring Resonators for Chemical and Biological Sensing: A Tutorial
N2 - Silicon photonic micro-ring resonators (MRR) developed on the silicon-on-insulator (SOI) platform, owing to their high sensitivity and small footprint, show great potential for many chemical and biological sensing applications such as label-free detection in environmental monitoring, biomedical engineering, and food analysis. In this tutorial, we provide the theoretical background and give design guidelines for SOI-based MRR as well as examples of surface functionalization procedures for label-free detection of molecules.
After introducing the advantages and perspectives of MRR, fundamentals of MRR are described in detail, followed by an introduction to the fabrication methods, which are based on a complementary metal-oxide semiconductor (CMOS) technology. Optimization of MRR for chemical and biological sensing is provided, with special emphasis on the optimization of waveguide geometry. At this point, the difference between chemical bulk sensing and label-free surface sensing is explained, and definitions like waveguide sensitivity, ring sensitivity, overall sensitivity as well as the limit of detection (LoD) of MRR are introduced. Further, we show and explain chemical bulk sensing of sodium chloride (NaCl) in water and provide a recipe for label-free surface sensing.
KW - Lab on a chip
KW - Biosensor
KW - Cmos
KW - Silanization
KW - Surface derivatization
KW - Evanescent wave
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-529360
DO - https://doi.org/10.36227/techrxiv.14909901.v1
SP - 1
EP - 18
PB - IEEE
CY - Piscataway Township
AN - OPUS4-52936
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Cakir, Cafer Tufan
A1 - Piotrowiak, T.
A1 - Reinholz, Uwe
A1 - Ludwig, A.
A1 - Emmerling, Franziska
A1 - Streli, C.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
T1 - Exploring the Depths of Corrosion: A Novel GE-XANES Technique for Investigating Compositionally Complex Alloys
N2 - In this study, we propose the use of nondestructive, depth-resolved, element-specific characterization using grazing exit X-ray absorption near-edge structure spectroscopy (GE-XANES) to investigate the corrosion process in compositionally complex alloys (CCAs). By combining grazing exit X-ray fluorescence spectroscopy (GE-XRF) geometry and a pnCCD detector, we provide a scanning-free, nondestructive, depth-resolved analysis in a sub-micrometer depth range, which is especially relevant for layered materials, such as corroded CCAs. Our setup allows for spatial and energy-resolved measurements and directly extracts the desired fluorescence line, free from scattering events and other overlapping lines. We demonstrate the potential of our approach on a compositionally complex CrCoNi alloy and a layered reference sample with known composition and specific layer thickness. Our findings indicate that this new GE-XANES approach has exciting opportunities for studying surface catalysis and corrosion processes in real-world materials.
KW - Degradation mechanisms
KW - Grazin exit XANES
KW - Depth resolved XANES
KW - Compositional complex alloys
KW - Corrosion
PY - 2023
DO - https://doi.org/10.1021/acs.analchem.3c00404
VL - 95
SP - 4810
EP - 4818
PB - ACS Publications
AN - OPUS4-57823
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Polte, Jörg
A1 - Herder, Martin
A1 - Erler, Robert
A1 - Rolf, Simone
A1 - Fischer, A.
A1 - Würth, Christian
A1 - Thünemann, Andreas
A1 - Kraehnert, R.
A1 - Emmerling, Franziska
T1 - Mechanistic insights into seeded growth processes of gold nanoparticles
N2 - A facile approach for the synthesis of monodisperse gold nanoparticles with radii in the range of 7 to 20 nm is presented. Starting from monodisperse seeds with radii of 7 nm, produced in the first step, the addition of a defined amount of additional precursor material permits distinct size regulation and the realization of predicted nanoparticle sizes. These information were derived from ex- and in situ investigations by comprehensive small angle X-ray scattering (SAXS), X-ray absorption near edge structure (XANES) and UV-Vis data to obtain information on the physicochemical mechanisms. The obtained mechanisms can be transferred to other seeded growth processes. Compared to similar approaches, the presented synthesis route circumvents the use of different reducing or stabilizing agents. The size of resulting nanoparticles can be varied over a large size range presented for the first time without a measurable change in the shape, polydispersity or surface chemistry. Thus, the resulting nanoparticles are ideal candidates for size dependence investigations.
KW - Gold nanoparticles
KW - SAXS
KW - XANES
KW - Growth mechanism
PY - 2010
DO - https://doi.org/10.1039/c0nr00541j
SN - 2040-3364
SN - 2040-3372
VL - 2
IS - 11
SP - 2463
EP - 2469
PB - RSC Publ.
CY - Cambridge
AN - OPUS4-22346
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Kuhne, Maren
A1 - Dippong, Martin
A1 - Flemig, Sabine
A1 - Hoffmann, Katrin
A1 - Petsch, K.
A1 - Schenk, J.A.
A1 - Kunte, Hans-Jörg
A1 - Schneider, Rudolf
T1 - Comparative characterization of mAb producing hapten-specific hybridoma cells by flow cytometric analysis and ELISA
N2 - A novel method that optimizes the screening for antibody-secreting hapten-specific hybridoma cells by using flow cytometry is described. Cell clones specific for five different haptens were analyzed. We selectively double stained and analyzed fixed hybridoma cells with fluorophore-labeled haptens to demonstrate the target-selectivity, and with a fluorophore-labeled anti-mouse IgG antibody to characterize the level of surface expression of membrane-bound IgGs. ELISA measurements with the supernatants of the individual hybridoma clones revealed that antibodies from those cells, which showed the highest fluorescence intensities in the flow cytometric analysis, also displayed the highest affinities for the target antigens. The fluorescence intensity of antibody-producing cells corresponded well with the produced antibodies' affinities toward their respective antigens. Immunohistochemical staining verified the successful double labeling of the cells. Our method makes it possible to perform a high-throughput screening for hybridoma cells, which have both an adequate IgG production rate and a high target affinity.
KW - Immunization
KW - Hapten
KW - Monoclonal antibodies
KW - Hybridoma
KW - Flow cytometry
KW - ELISA
KW - Estradiol
KW - Estrone
KW - Digoxigenin
KW - Zearalenone
KW - Aflatoxin
KW - CLSM
PY - 2014
DO - https://doi.org/10.1016/j.jim.2014.07.004
SN - 0022-1759
SN - 1872-7905
VL - 413
SP - 45
EP - 56
PB - Elsevier B.V.
CY - Amsterdam
AN - OPUS4-32322
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Wiggenhauser, Herbert
A1 - Samokrutov, A
A1 - Mayer, K
A1 - Krause, Martin
A1 - Alekhin, S. G.
A1 - Elkin, V
T1 - Large aperture ultrasonic system for testing thick concrete structures
N2 - A Large Aperture UltraSonic system (LAUS) has been designed and built for testing thick concrete structures. The scalable system consists of twelve ultrasonic units, each hosting 32 individual shear wave transducers with mechanical dry point contact (DPC) to the concrete surface. The twelve units are attached to the concrete surface using a vacuum case which holds them in place during operation. Each LAUS unit can be placed individually on the surface to achieve optimal ultrasonic condition, e.g. to avoid rebars. For the generation of vacuum, air pressure is supplied to each unit through an air hose. The twelve units define an aperture which is necessary for fast reconstruction of the subsurface structure. The well-known SAFT (Synthetic Aperture Focusing Technique) algorithm has been adopted to this situation, where the individual LAUS units form a linear aperture with not necessarily equidistant spacing between the units. The exact geometrical position of the units, which are individually marked with retroreflective labels, is determined using photographs and image processing. All transducers are synchronized and work either as transmitter or receiver. A full scan consists of 12 * 11 recordings, where each unit acts as transmitter once and all others as receivers. An electronic sub-unit on the back of the ultrasonic device holds the battery and handles data acquisition, synchronization and data communication. A computer is used as base unit which communicates with each LAUS unit for control and data acquisition, the synchronization is performed by a radio modem that uses a special algorithm similar to a digital PLL (phase locked loop). No wire connections are necessary between the units and the base system.
The LAUS system is designed to investigate concrete structures with thicknesses in excess of 2 m, depending on the acoustic condition of the object under investigation. Highly reinforced concrete may have less penetration depth. The LAUS provides quasi real time imaging, once the transducers are put in place and the data has been acquired. First measurements on a foundation slab confirm, that the system can register ultrasonic echoes from the back wall at 4 m distance.
KW - Ultrasound "Large Aperture" NDT Concrete
PY - 2017
DO - https://doi.org/10.1061/(ASCE)IS.1943-555X.0000314
SN - 1076-0342
SN - 1943-555X
VL - 23
IS - 1
SP - B4016004-1
EP - B4016004-9
PB - American Society of Civil Engineers (ASCE)
CY - Reston, VA 20191-4400 USA
AN - OPUS4-39372
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Stadthaus, Meinhard
A1 - Thomas, Hans-Martin
A1 - Migoun, N.P.
A1 - Gnusin, A.B.
A1 - Baugatz, J.
A1 - König, W.
T1 - Sensitivity of penetrant and magnetic particle testing - Performance testing of detection media for penetrant and magnetic particle testing (PT and MT)
N2 - Die Empfindlichkeit von Eindring- und Magnetpulverprüfungen (PT, MT) hängt unter anderem von der Eignung und der Qualität der Prüfmittel ab (für PT bezeichnet als Eindringsystem). Die Ermittlung der Empfindlichkeit erfolgt an Kontrollkörpern mit natürlichen und künstlichen Inhomogenitäten durch Ermittlung der Anzeigenerkennbarkeit als Maß für die Eignung. Die europäischen Normen spezifizieren die Anforderungen an die Prüfmittel für Typen-, Chargen- und Betriebsprüfungen nach pr EN ISO 3452-2 für PT und EN ISO 9934-2 für MT. Dieser Beitrag beschreibt die Ermittlung der Empfindlichkeit von Prüfmitteln sowie deren Qualifizierung bei der Typenprüfung. Die vorgeschlagenen Verfahren wurden durch experimentelle Untersuchungen validiert, bei denen ein Bildverarbeitungssystem zur Ermittlung der Anzeigenerkennbarkeit verwendet wurde. Im Hinblick auf die Qualifizierung der Prüfmittel wird die Zuverlässigkeit der Verfahren diskutiert.
PY - 2004
DO - https://doi.org/10.3139/120.100591
SN - 0025-5300
VL - 46
IS - 6
SP - 320
EP - 326
PB - Carl Hanser Verlag
CY - München
AN - OPUS4-3574
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Neumann, Patrick P.
A1 - Kohlhoff, Harald
A1 - Hüllmann, Dino
A1 - Lilienthal, A.J.
A1 - Kluge, Martin
T1 - Bringing Mobile Robot Olfaction to the Next Dimension – UAV-based Remote Sensing of Gas Clouds and Source Localization
N2 - This paper introduces a novel robotic platform for aerial remote gas sensing. Spectroscopic measurement methods for remote sensing of selected gases lend themselves for use on mini-copters, which offer a number of advantages for inspection and surveillance. No direct contact with the target gas is needed and thus the influence of the aerial platform on the measured gas plume can be kept to a minimum. This allows to overcome one of the major issues with gas-sensitive mini-copters. On the other hand, remote gas sensors, most prominently Tunable Diode Laser Absorption Spectroscopy (TDLAS) sensors have been too bulky given the payload and energy restrictions of mini-copters. Here, we introduce and present the Unmanned Aerial Vehicle for Remote Gas Sensing (UAV-REGAS), which combines a novel lightweight TDLAS sensor with a 3-axis aerial stabilization gimbal for aiming on a versatile hexacopter. The proposed system can be deployed in scenarios that cannot be addressed by currently available robots and thus constitutes a significant step forward for the field of Mobile Robot Olfaction (MRO). It enables tomographic reconstruction of gas plumes and a localization of gas sources. We also present first results showing the gas sensing and aiming capabilities under realistic conditions.
T2 - IEEE International Conference on Robotics and Automation (ICRA)
CY - Singapore
DA - 29.05.2017
KW - Tunable Diode Laser Absorption Spectroscopy (TDLAS)
KW - 3-axis gimbal
KW - Mobile Robot Olfaction
KW - Tomographic reconstruction of gas plumes
KW - Localization of gas sources
KW - Aerial platform
PY - 2017
SN - 978-1-5090-4632-4
SP - 3910
EP - 3916
PB - IEEE
AN - OPUS4-40545
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Fittschen, U.E.A.
A1 - Menzel, M.
A1 - Scharf, O.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Buzanich, Günter
A1 - Lopez, V.M.
A1 - McIntosh, K.
A1 - Streli, C.
A1 - Havrilla, G.J.
T1 - Observation of X-ray shadings in synchrotron radiation-total reflection X-ray fluorescence using a color X-ray camera
N2 - Absorption effects and the impact of specimen shape on TXRF analysis has been discussed intensively. Model calculations indicated that ring shaped specimens should give better results in terms of higher counts per mass signals than filled rectangle or circle shaped specimens. One major reason for the difference in signal is shading effects. Full field micro-XRF with a color X-ray camera (CXC) was used to investigate shading, which occurs when working with small angles of excitation as in TXRF. The device allows monitoring the illuminated parts of the sample and the shaded parts at the same time. It is expected that sample material hit first by the primary beam shade material behind it. Using the CXC shading could be directly visualized for the high concentration specimens.
In order to compare the experimental results with calculation of the shading effect the generation of controlled specimens is crucial. This was achieved by 'drop on demand' technology. It allows generating uniform, microscopic deposits of elements. The experimentally measured shadings match well with those expected from calculation.
KW - TXRF
KW - Full field micro-XRF
KW - Color X-ray camera
PY - 2014
DO - https://doi.org/10.1016/j.sab.2014.06.025
SN - 0584-8547
SN - 0038-6987
VL - 99
SP - 179
EP - 184
PB - Elsevier
CY - Amsterdam
AN - OPUS4-31180
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Cabral, A.R.
A1 - Radtke, Martin
A1 - Munnik, F.
A1 - Lehmann, B.
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Tupinambá, M.
A1 - Kwitko-Ribeiro, R.
T1 - Iodine in alluvial platinum-palladium nuggets: evidence for biogenic precious-metal fixation
N2 - Synchrotron radiation-induced X-ray fluorescence (SR-XRF) spectrometry was applied to determine iodine concentrations in alluvial Pt–Pd aggregates with delicate morphological features from Córrego Bom Sucesso, Minas Gerais, Brazil. The millimetre-sized botryoidal and rod-shaped grains of alluvial Pt–Pd–Hg intermetallic compounds have surprisingly high concentrations of iodine, in the range from 10 to ~ 120 μg/g. Because iodine is a strongly biophile element, known to be enriched in peatlands and plant remains in soils by microbial activity, its concentration in the Pt–Pd nuggets suggests biogenic precious-metal fixation in the aqueous alluvial milieu. Biogenic and inorganic processes, such as bioreduction and electrochemical metal accretion, could mutually have contributed to the growth of nanoparticles, formed on organic templates, to millimetric Pt–Pd nuggets.
KW - Lodine
KW - Pt-Pd nuggets
KW - Córrego Bom Sucesso
KW - Minas Gerais
KW - Brazil
PY - 2011
DO - https://doi.org/10.1016/j.chemgeo.2010.12.003
SN - 0009-2541
SN - 1872-6836
VL - 281
IS - 1-2
SP - 125
EP - 132
PB - Elsevier B.V.
CY - Amsterdam
AN - OPUS4-23174
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Lahiri, D.
A1 - Sharma, S.M.
A1 - Verma, A.K.
A1 - Vishwanadh, B.
A1 - Dey, G.K.
A1 - Schumacher, G.
A1 - Scherb, T.
A1 - Riesemeier, Heinrich
A1 - Reinholz, Uwe
A1 - Radtke, Martin
A1 - Banerjee, S.
T1 - Investigation of short-range structural order in Zr69.5Cu12Ni11Al7.5 and Zr41.5Ti41.5Ni17 glasses, using X-ray absorption spectroscopy and ab initio molecular dynamics simulations
N2 - Short-range order has been investigated in Zr69.5Cu12Ni11Al7.5 and Zr41.5Ti41.5Ni17 metallic glasses using X-ray absorption spectroscopy and ab initio molecular dynamics simulations. While both of these alloys are good glass formers, there is a difference in their glass-forming abilities (Zr41.5Ti41.5Ni17 > Zr69.5Cu12Ni11Al7.5). This difference is explained by inciting the relative importance of strong chemical order, icosahedral content, cluster symmetry and configuration diversity.
KW - Multi-component alloy
KW - Glass-forming ability
KW - XAFS
KW - Local structure
KW - AIMD simulation
PY - 2014
DO - https://doi.org/10.1107/S1600577514017792
SN - 0909-0495
SN - 1600-5775
VL - 21
IS - 6
SP - 1296
EP - 1304
PB - Blackwell Publishing
CY - Oxford
AN - OPUS4-31837
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Kulow, Anicó
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Reinholz, Uwe
A1 - Emmerling, Franziska
A1 - Hampel, S.
A1 - Fittschen, U.E.A.
A1 - Streli, C.
A1 - Radtke, Martin
T1 - Comparison of three reconstruction methods based on deconvolution, iterative algorithm and neural network for X-ray fluorescence imaging with coded apertures
N2 - X-ray imaging methods are used in many fields of research, as they allow a non-destructive Investigation of the elemental content of various samples. As for every imaging method, for X-ray imaging the optics are of crucial importance. However, these optics can be very expensive and laborious to build, as the requirements on surface roughness and precision are extremely high. Angles of reflection and refraction are often in the range of a few mrad, making a compact design hard to achieve. In this work we present a possibility to simplify X-ray imaging. We have adapted the coded aperture method, a high energy radiation imaging method that has its origins in astrophysics, to full field X-ray fluorescence imaging. In coded aperture imaging, an object is projected through a known mask, the coded aperture, onto an area sensitive detector. The resulting image consists of overlapping projections of the object and a reconstruction step is necessary to obtain the information from the recorded image. We recorded fluorescence images of different samples with an energy-dispersive 2D detector (pnCCD) and investigated different reconstruction methods. With a small coded aperture with 12 holes we could significantly increase the count rate compared to measurements with a straight polycapillary optic. We show that the reconstruction of two different samples is possible with a deconvolution approach, an iterative algorithm and a neural network. These results demonstrate that X-ray fluorescence imaging with coded apertures has the potential to deliver good results without scanning and with an improved count rate, so that measurement times can be shortened compared to established methods.
KW - X-ray fluorescence imaging
KW - Coded apertures
KW - Imaging
KW - Elemental mapping
KW - Image reconstruction
PY - 2020
DO - https://doi.org/10.1039/d0ja00146e
VL - 35
IS - 7
SP - 1423
EP - 1434
PB - Royal Society of Chemistry
CY - United Kingdom
AN - OPUS4-51518
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -