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Organisationseinheit der BAM
- 9 Komponentensicherheit (230)
- 6 Materialchemie (192)
- 7 Bauwerkssicherheit (177)
- 5 Werkstofftechnik (163)
- 8 Zerstörungsfreie Prüfung (127)
- 7.6 Korrosion und Korrosionsschutz (109)
- 9.3 Schweißtechnische Fertigungsverfahren (76)
- 9.4 Integrität von Schweißverbindungen (73)
- 8.5 Röntgenbildgebung (61)
- 9.5 Tribologie und Verschleißschutz (59)
- 1 Analytische Chemie; Referenzmaterialien (54)
- 6.3 Strukturanalytik (53)
- 6.6 Physik und chemische Analytik der Polymere (50)
- 4 Material und Umwelt (49)
- 5.1 Mikrostruktur Design und Degradation (49)
- 5.2 Metallische Hochtemperaturwerkstoffe (44)
- 3 Gefahrgutumschließungen; Energiespeicher (42)
- 7.1 Baustoffe (33)
- 2 Prozess- und Anlagensicherheit (31)
- 1.2 Biophotonik (28)
- 6.7 Materialsynthese und Design (28)
- 5.4 Multimateriale Fertigungsprozesse (27)
- 4.1 Biologische Materialschädigung und Referenzorganismen (26)
- 8.0 Abteilungsleitung und andere (26)
- 5.6 Glas (25)
- 6.1 Oberflächen- und Dünnschichtanalyse (25)
- 6.2 Material- und Oberflächentechnologien (25)
- 6.5 Synthese und Streuverfahren nanostrukturierter Materialien (24)
- 9.0 Abteilungsleitung und andere (24)
- 8.4 Akustische und elektromagnetische Verfahren (21)
- 9.2 Versuchsanlagen und Prüftechnik (20)
- 7.5 Technische Eigenschaften von Polymerwerkstoffen (19)
- 5.5 Materialmodellierung (16)
- 3.0 Abteilungsleitung und andere (15)
- 5.3 Polymere Verbundwerkstoffe (15)
- 7.4 Baustofftechnologie (14)
- 8.6 Faseroptische Sensorik (14)
- 3.2 Gefahrguttanks und Unfallmechanik (13)
- 4.2 Material-Mikrobiom Wechselwirkungen (13)
- 6.0 Abteilungsleitung und andere (13)
- 2.3 Einstufung von Gefahrstoffen und -gütern (12)
- 5.0 Abteilungsleitung und andere (12)
- 1.4 Prozessanalytik (11)
- 8.1 Sensorik, mess- und prüftechnische Verfahren (11)
- 2.2 Prozesssimulation (9)
- 3.4 Sicherheit von Lagerbehältern (9)
- 2.0 Abteilungsleitung und andere (8)
- 2.1 Sicherheit von Energieträgern (6)
- 3.1 Sicherheit von Gefahrgutverpackungen und Batterien (6)
- 4.5 Kunst- und Kulturgutanalyse (6)
- 7.2 Ingenieurbau (6)
- 1.8 Umweltanalytik (5)
- 7.0 Abteilungsleitung und andere (5)
- 8.2 Zerstörungsfreie Prüfmethoden für das Bauwesen (5)
- 1.1 Anorganische Spurenanalytik (4)
- 1.5 Proteinanalytik (4)
- 1.9 Chemische und optische Sensorik (4)
- 4.3 Schadstofftransfer und Umwelttechnologien (4)
- S Qualitätsinfrastruktur (4)
- S.3 Ökodesign und Energieverbrauchskennzeichnung (4)
- 1.0 Abteilungsleitung und andere (3)
- 3.3 Sicherheit von Transportbehältern (3)
- P Präsident (3)
- P.0 Präsident und andere (3)
- 1.7 Organische Spuren- und Lebensmittelanalytik (2)
- 4.0 Abteilungsleitung und andere (2)
- 9.6 Additive Fertigung metallischer Komponenten (2)
- 1.6 Anorganische Referenzmaterialien (1)
Eingeladener Vortrag
- nein (411)
Das Ziel der Arbeit war die Entwicklung einer magnetischen Anreicherungsmethode für eine Bead-basierte Substanzbibliothek zur Identifizierung von Proteinbindern. Im Ramen des Forschungsbelegs wurde bereits eine Anreicherungsmethode für ein Modellsystem einer Peptidbibliothek entwickelt. Das Modellsystem bestand dabei aus zwei verschiedenen Peptiden. Als Positivkontrolle wurde das FLAG-Peptid gewählt, welches selektiv gegen den Anti-FLAG-Antikörper bindet, und ein weiteres Peptid wurde als Negativkontrolle gewählt. Anhand dieses Modellsystems konnte die zuvor entwickelte Anreicherungsmethode von 20.000 auf 1.000.000 Beads vergrößert werden. Hierbei wurde ein Anreicherungsfaktor von 818 und eine gute Wiederfindungsrate von 82% erreicht.
In order to satisfy the growing requirements towards lightweight design and resource efficiency in modern steel constructions, e.g., mobile cranes and bridges, high-strength steels with typical yield strength ≥ 690 MPa are coming into use to an increasing extent. However, these steels require special treatment in welding. The susceptibility for degradation of the mechanical properties
in the presence of hydrogen increases significantly with increasing yield strength. In case of missing knowledge about how and the amount of hydrogen that is uptaken during welding, hydrogen-assisted cracking (HAC) can be a negative consequence.
Moreover, modern weld technology like the modified spray arc process enables welding of narrower weld seams. In this context,
a reduced number of weld beads, volume, and total heat input are technical and economical benefits. This work presents the influence of welding parameters on the diffusible hydrogen content in both (1) single-pass and (2) multi-layer welds. Different
hydrogen concentrations were detected by varied contact tube distance, wire feed speed, arc length, and varied arc type (transitional
arc and modified spray arc). The results show that all welding parameters have significant influence on the diffusible hydrogen concentration in the single-pass welds. By increasing the number of weld beads in case of multi-layer welding, the
hydrogen concentration has been reduced. Whereby, differences in hydrogen concentrations between both arc types are present.
Powder X-ray diffraction is a time-consuming and challenging task, especially for preparation of sensitive phases like ettringite and calcium-silicate-hydrate (C-S-H) phases. Fine-grained ultrahigh-performance concrete (UHPC) with an average grain size <100 μm could be investigated directly without time-consuming milling. As a proof of concept, small UHPC cylinders with plain surfaces were investigated with a newly designed sample holder. The comparison with conventionally prepared powder shows the feasibility of fast qualitative phase analysis using this approach. As a great benefit, a depth-dependent analysis, as well as a comparison of surface layers and core material, was carried out.
Slags from the nonferrous metals industry have great potential to be used as feedstocks for the production of alkali-activated materials. Until now, however, only very limited information has been available about the structural characteristics of these materials. In the work presented herein, synthetic slags in the CaO–FeOx–SiO2 system, representing typical compositions of Fe-rich slags, and inorganic polymers (IPs) produced from the synthetic slags by activation with alkali Silicate solutions have been studied by means of X-ray absorption near-edge structure (XANES) spectroscopy at the Fe K-edge. The iron in the slags was largely Fe2+, with an average coordination number of approximately 5 for the iron in the amorphous fraction. The increase in average oxidation number after alkali-activation was conceptualized as the consequence of slag dissolution and IP precipitation, and employed to calculate the degrees of reaction of the slags. The degree of reaction of the slags increased with increasing amorphous fraction. The iron in the IPs had an average coordination number of approximately 5; thus, IPs produced from the Fe-rich slags studied here are not Fe-analogs of aluminosilicate geopolymers, but differ significantly in terms of structure from the latter.
Time-resolved phase-contrast microscopy is employed to visualize spatio-temporal thermal transients induced by tight focusing of a single Ti:sapphire fs-laser pulse into a solid dielectric sample. This method relies on the coupling of the refractive index change and the sample temperature through the thermo-optic coefficient dn/dT. The thermal transients are studied on a timescale ranging from 10 ns up to 0.1 ms after laser excitation. Beyond providing direct insights into the laser–matter interaction, analyzing the results obtained also enables quantifying the local thermal diffusivity of the sample on a micrometer scale. Studies conducted in different solid dielectrics, namely amorphous fused silica (a-SiO2), a commercial borosilicate glass (BO33, Schott), and a custom alkaline earth silicate glass (NaSi66), illustrate the applicability of this approach to the investigation of various glassy materials.
Meso-Lactide was polymerized in bulk at 60, 80, and 100 °C by means of three different types of catalysts: dibutyltinsulfides (2,2-dibutyl-2-stanna-1,3-dithiolane and 2,20-dibutyl-2-stanna-1,3-dithiane), dibutyltin derivatives of substituted cate-chols (BuCa, CyCa, and BzCa), and dibutyltin derivatives of2,2 dihydroxybiphenyl (SnBi) and 2,2-dihydroxy-1,10-binaphthyl(SnNa. Only the latter two catalysts were active at 60 °C. The architecture of the resulting polylactides depends very much on the structure of the catalyst and on the temperature. At the lowest temperature (60 °C), SnBi and SnNa mainly yielded even-numbered linear chains, but SnNa also yielded even-numbered cycles at 100 °C and short reaction times. In contrast,BuCa, CyCa, and BzCa mainly yielded odd-numbered cycles, although the same catalysts yielded even-numbered linear chains when benzylalcohol was added.
Automatisierungs- und Regelkonzepte für das MSG-Engspaltschweißen - Pendel- und Füllgradregelung
(2018)
Das MSG-Engspaltschweißen eignet sich auf Grund der I-Nahtvorbereitung besonders für das wirtschaftliche Fügen bei hohen Blechdicken über 100 mm und bietet darüber hinaus zusätzliche technologische Vorteile. Für die automatisierte Anwendung des Verfahrens unter Produktionsbedingungen muss dabei die Prozesssicherheit auch für mitunter große Variationen der Spaltbreite entlang der Schweißnaht gesichert bleiben. In erster Linie betrifft dies bei mechanischer Auslenkung der Drahtelektrode die Adaption der Pendelbewegung auf die jeweilige Spaltbreite um eine ausreichende Flankenanbindung zu garantieren. Für die Online-Regelung der Pendelbewegung mittels Lichtbogensensorik wurde eine Methode implementiert die die notwendigen Pendelwinkel an jeder Nahtflanke unabhängig ermittelt und darüber hinaus Fehlstellungen des Brenners sowie Veränderungen des Kontaktrohrabstandes und der Prozessparameter eigenständig kompensiert. Eine Füllgradregelung auf Grundlage optischer Erfassung und Auswertung der Schweißnahtgeometrie wurde zusätzlich eingesetzt um bei veränderlichen Nahtquerschnittsflächen einen vorgegebenen, gleichbleibenden Lagenaufbau zu erzielen.
The Scaled Boundary Finite Element Method (SBFEM) is a semi-analytical method that showed promising results in modelling of guided ultrasonic waves. Efficiency and a low computational cost of the method are achieved by the discretisation of the boundary of a computational domain only, whereas for the domain itself the analytical solution is used. By means of the SBFEM different types of defects, e.g. fatigue cracks, pores, delamination, corrosion, integrated into a structure consisting of anisotropic and isotropic materials can be modelled.
In this contribution, the SBFEM is used to analyse the propagation of guided waves in a structure consisting of an isotropic metal bonded to anisotropic carbon fibre reinforced material. The method allowed to identify appropriate wave types (modes) and to analyse their interaction with different defects. Obtained results will be used to develop a structural health monitoring system for composite pressure vessels used in automotive industry.
Calcium cobaltite is one of the most promising oxide p-type thermoelectric materials. The solid-state reaction (or calcination, respectively), which is well known for large-scale powder synthesis of functional materials, can also be used for the synthesis of thermoelectric oxides. There are various calcination routines in literature for Ca3Co4O9 powder synthesis, but no systematic study has been done on the influence of calcination procedure on thermoelectric properties. Therefore, the influence of calcination conditions on the Seebeck coefficient and the electrical conductivity was studied by modifying calcination temperature, dwell time, particle size of raw materials and number of calcination cycles. This study shows that elevated temperatures, longer dwell times, or repeated calcinations during powder synthesis do not improve but deteriorate the thermoelectric properties of calcium cobaltite. Diffusion during calcination leads to idiomorphic grain growth, which lowers the driving force for sintering of the calcined powder. A lower driving force for sintering reduces the densification. The electrical conductivity increases linearly with densification. The calcination procedure barely influences the Seebeck coefficient. The calcination procedure has no influence on the phase formation of the sintered specimens.