Datei für die Öffentlichkeit verfügbar ("Open Access")
Filtern
Erscheinungsjahr
Dokumenttyp
- Zeitschriftenartikel (2012)
- Beitrag zu einem Tagungsband (399)
- Forschungsbericht (380)
- Dissertation (212)
- Zeitschriftenheft (Herausgeberschaft für das komplette Heft) (209)
- Forschungsdatensatz (141)
- Sonstiges (72)
- Posterpräsentation (48)
- Vortrag (43)
- Jahresbericht (20)
Sprache
- Englisch (2602)
- Deutsch (979)
- Mehrsprachig (24)
Schlagworte
- Additive manufacturing (74)
- SAXS (68)
- Nanoparticles (66)
- Fluorescence (53)
- Concrete (49)
- XPS (44)
- Zerstörungsfreie Prüfung (43)
- Ultrasound (42)
- Simulation (41)
- Corrosion (40)
Organisationseinheit der BAM
- 6 Materialchemie (543)
- 8 Zerstörungsfreie Prüfung (491)
- 1 Analytische Chemie; Referenzmaterialien (377)
- 7 Bauwerkssicherheit (238)
- 5 Werkstofftechnik (231)
- 9 Komponentensicherheit (228)
- 4 Material und Umwelt (219)
- 6.3 Strukturanalytik (174)
- 6.1 Oberflächen- und Dünnschichtanalyse (141)
- 8.5 Röntgenbildgebung (140)
- 8.0 Abteilungsleitung und andere (129)
- 8.2 Zerstörungsfreie Prüfmethoden für das Bauwesen (116)
- 6.5 Synthese und Streuverfahren nanostrukturierter Materialien (95)
- 6.6 Physik und chemische Analytik der Polymere (83)
- 5.1 Mikrostruktur Design und Degradation (82)
- 9.3 Schweißtechnische Fertigungsverfahren (80)
- 9.4 Integrität von Schweißverbindungen (77)
- 3 Gefahrgutumschließungen; Energiespeicher (76)
- 1.2 Biophotonik (71)
- 1.4 Prozessanalytik (69)
- 6.0 Abteilungsleitung und andere (69)
- 6.2 Material- und Oberflächentechnologien (65)
- 8.4 Akustische und elektromagnetische Verfahren (65)
- 7.5 Technische Eigenschaften von Polymerwerkstoffen (63)
- 1.1 Anorganische Spurenanalytik (60)
- 1.5 Proteinanalytik (60)
- 1.7 Organische Spuren- und Lebensmittelanalytik (60)
- 4.3 Schadstofftransfer und Umwelttechnologien (58)
- 7.4 Baustofftechnologie (56)
- 4.1 Biologische Materialschädigung und Referenzorganismen (55)
- 5.2 Metallische Hochtemperaturwerkstoffe (55)
- S Qualitätsinfrastruktur (49)
- 8.6 Faseroptische Sensorik (48)
- 1.8 Umweltanalytik (46)
- 1.9 Chemische und optische Sensorik (39)
- 7.2 Ingenieurbau (38)
- S.2 Digitalisierung der Qualitätsinfrastruktur (38)
- 3.1 Sicherheit von Gefahrgutverpackungen und Batterien (37)
- VP Vizepräsident (37)
- VP.1 eScience (37)
- 9.0 Abteilungsleitung und andere (36)
- 2 Prozess- und Anlagensicherheit (35)
- 9.2 Versuchsanlagen und Prüftechnik (35)
- 4.0 Abteilungsleitung und andere (34)
- 5.3 Polymere Verbundwerkstoffe (34)
- 5.4 Multimateriale Fertigungsprozesse (33)
- 7.6 Korrosion und Korrosionsschutz (32)
- 4.2 Material-Mikrobiom Wechselwirkungen (31)
- 4.5 Kunst- und Kulturgutanalyse (29)
- 5.5 Materialmodellierung (28)
- 8.1 Sensorik, mess- und prüftechnische Verfahren (28)
- 2.1 Sicherheit von Energieträgern (25)
- 9.5 Tribologie und Verschleißschutz (25)
- 4.4 Thermochemische Reststoffbehandlung und Wertstoffrückgewinnung (24)
- 7.1 Baustoffe (24)
- 9.6 Additive Fertigung metallischer Komponenten (24)
- 5.6 Glas (23)
- 7.7 Modellierung und Simulation (20)
- 1.3 Instrumentelle Analytik (18)
- 5.0 Abteilungsleitung und andere (17)
- 7.0 Abteilungsleitung und andere (16)
- 1.6 Anorganische Referenzmaterialien (15)
- 1.0 Abteilungsleitung und andere (12)
- 7.3 Brandingenieurwesen (12)
- 2.2 Prozesssimulation (9)
- 3.4 Sicherheit von Lagerbehältern (9)
- 3.5 Sicherheit von Gasspeichern (9)
- 6.4 Materialinformatik (9)
- 6.7 Materialsynthese und Design (9)
- P Präsident (9)
- P.0 Präsident und andere (9)
- S.3 Ökodesign und Energieverbrauchskennzeichnung (8)
- 3.2 Gefahrguttanks und Unfallmechanik (7)
- 3.6 Elektrochemische Energiematerialien (6)
- 3.0 Abteilungsleitung und andere (5)
- 3.3 Sicherheit von Transportbehältern (5)
- S.1 Qualität im Prüfwesen (4)
- Z Zentrale Dienstleistungen (4)
- Z.1 Organisation, Controlling (4)
- 4.6 Molekulare und angewandte Entomologie (3)
- 2.0 Abteilungsleitung und andere (2)
- 2.3 Einstufung von Gefahrstoffen und -gütern (2)
- 2.5 Konformitätsbewertung Explosivstoffe/Pyrotechnik (1)
- KM Kommunikation, Marketing (1)
- MP Mitglied des Präsidiums (1)
- VP.2 Informationstechnik (1)
Paper des Monats
- ja (49)
Eingeladener Vortrag
- nein (43)
Tests for assessing prestressing steels' susceptibility to hydrogen‐induced stress corrosion cracking are essential for approvals, in‐house monitoring, and third‐party material testing. According to ISO 15630‐3, the time to brittle fracture by constant load under corrosive conditions in thiocyanate test solutions (A or B) at 50°C is measured. In the literature, a high scattering in stress corrosion tests is reported, which questions the integrity of the test procedure. This paper shows the results of studies about the influence of solution composition on hydrogen charging in electrochemical and permeation measurements. Electrochemical experiments show that polished steel surfaces without common drawing layers have more consistent free corrosion currents, polarization resistances, and B‐values in solution A with low scattering compared to the solution B experiments. The influence of temperature at 50°C and an ambient temperature of 22°C was also tested.
In this study, we demonstrate the applicability of nitrogen microwave inductively coupled atmospheric pressure mass spectrometry (MICAP-MS) for Ca, Fe, and Se quantification in human serum using isotope dilution (ID) analysis. The matrix tolerance of MICAP-MS in Na matrix was investigated, uncovering that high Na levels can suppress the signal intensity. This suppression is likely due to the plasma loading and the space charge effect. Moreover, 40Ca and 44Ca isotopic fractionation was noted at elevated Na concentration. Nine certified serum samples were analyzed using both external calibration and ID analysis. Overestimation of Cr, Zn, As, and Se was found in the results of external calibration, which might be resulted from C-induced polyatomic interference and signal enhancement, respectively. Further investigations performed with methanol showed a similar enhancement effect for Zn, As, and Se, potentially supporting this assumption. The mass concentrations determined with ID analysis show metrological compatibility with the reference values, indicating that MICAP-MS combined with ID analysis can be a promising method for precise Ca, Fe, and Se determination. Moreover, this combination reduces the influences of matrix effects, broadening the applicability of MICAP-MS for samples with complex matrix.
This technical note highlights the fact that CF-LIBS algorithms work in mole fractions, while results of spectrochemical analysis are usually reported in mass fractions or mass percent. Ignoring this difference and not converting mole fractions to mass fractions can lead to errors in reported concentrations determined by the CF-LIBS method and inadequate comparison of these concentrations with certified concentrations. Here, the key points of the CF-LIBS algorithm are reproduced and the formulae for converting a mole fraction to a mass fraction and vice versa are given. Several numerical examples are also given, which show that the greater the difference between the molar mass of an individual element in a sample and the average molar mass, the greater the discrepancy between the mole and mass fractions.
Solvent-free sample preparation offers some advantages over solvent-based techniques, such as improved accuracy, reproducibility and sensitivity, for matrix-assisted laser desorption/ionization (MALDI) analysis. However, little or no information is available on the application of solvent-free techniques for the MALDI analysis of polymer blends. Solvent-free sample preparation by ball milling was applied with varying sample-to-matrix ratios for MALDI time-of-flight mass spectrometry analysis of various polymers, including polystyrenes, poly(methyl methacrylate)s and poly(ethylene glycol)s. The peak intensity ratios were compared with those obtained after using the conventional dried droplet sample preparation method. In addition, solvent-assisted milling was also applied to improve sample homogeneities.
Depending on the sample preparation method used, different peak intensity ratios were found, showing varying degrees of suppression of the signal intensities of higher mass polymers. Ball milling for up to 30 min was required to achieve constant intensity ratios indicating homogeneous mixtures. The use of wet-assisted grinding to improve the homogeneity of the blends was found to be disadvantageous as it caused partial degradation and mass-dependent segregation of the polymers in the vials.The results clearly show that solvent-free sample preparation must be carefully considered when applied to synthetic polymer blends, as it may cause additional problems with regard to homogeneity and stability of the blends.
This contribution reports the development of a polymerizable BODIPY-type fluorescent probe targeting small-molecule carboxylates for incorporation into molecularly imprinted polymers (MIPs). The design of the probe crosslinker includes a urea recognition site p-conjugated to the 3-position of the BODIPY core and two methacrylate moieties. Titration experiments with a carboxylate-expressing antibiotic, levofloxacin (LEVO), showed a blue shift of the absorption band as well as a broadening and decrease in emission, attributed to hydrogen bonding between the probe’s urea group and the carboxylate group of the antibiotic. Using this probe crosslinker, core–shell particles with a silica core and a thin MIP shell were prepared for the detection of LEVO. The MIP exhibited highly selective recognition of LEVO, with an imprinting factor of 18.1 compared to the non-imprinted polymer. Transmission electron microscopy confirmed the core–shell structure and spectroscopic studies revealed that the receptor’s positioning leads to a unique perturbation of the polymethinic character of the BODIPY chromophore, entailing the favourable responses. These features are fully preserved in the MIP, whereas no such response was observed for competitors such as ampicillin. The sensory particles allowed to detect LEVO down to submicromolar concentrations in dioxane. We have developed here for the first time a BODIPY probe for organic carboxylates and incorporated it into polymers using the imprinting technique, paving the way for BODIPY-type fluorescent MIP sensors.
Die Angabe von Unsicherheiten bei zertifizierten Werten von Referenzmaterialien ist von entscheidender Bedeutung. Die korrekte Einbindung der Unsicherheiten zur Berechnung von Verfahrensmessunsicherheiten ist wesentlich für die Gewährleistung der Genauigkeit und Zuverlässigkeit von Messungen. In diesem Vortrag werden die verschiedenen Einflussfaktoren auf die Unsicherheit zertifizierter Werte gemäß ISO Guide 35 dargestellt. Dabei werden insbesondere die Charakterisierung, Homogenität und Stabilität als entscheidende Faktoren für die Bestimmung der Unsicherheit eines Referenzmaterials betrachtet. Abschließend wird das Konzept anhand eines konkreten Beispiels veranschaulicht, um die praktische Anwendung und die Auswirkungen auf die Berechnung von Verfahrensmessunsicherheiten zu verdeutlichen.
This is the stable version of the full-notch creep test ontology (OntoFNCT) that ontologically represents the full-notch creep test. OntoFNCT has been developed in accordance with the corresponding test standard ISO 16770:2019-09 Plastics - Determination of environmental stress cracking (ESC) of polyethylene - Full-notch creep test (FNCT).
The OntoFNCT provides conceptualizations that are supposed to be valid for the description of full-notch creep tests and associated data in accordance with the corresponding test standard. By using OntoFNCT for storing full-notch creep test data, all data will be well structured and based on a common vocabulary agreed on by an expert group (generation of FAIR data) which is meant to lead to enhanced data interoperability. This comprises several data categories such as primary data, secondary data and metadata. Data will be human and machine readable. The usage of OntoFNCT facilitates data retrieval and downstream usage. Due to a close connection to the mid-level PMD core ontology (PMDco), the interoperability of full-notch creep test data is enhanced and querying in combination with other aspects and data within the broad field of materials science and engineering (MSE) is facilitated.
The class structure of OntoFNCT forms a comprehensible and semantic layer for unified storage of data generated in a full-notch creep test including the possibility to record data from analysis and re-evaluation. Furthermore, extensive metadata allows to assess data quality and reliability. Following the open world assumption, object properties are deliberately low restrictive and sparse.
The BAM-GGR 016 explains the requirements of ADR, RID, ADN and IMDG for management systems for design, manufacturing, testing, documentation, use, maintenance, and inspection of packagings for package designs for the transport of radioactive material not requiring competent authority approval for all designs of exempted packages, packages type IP-1, IP-2, IP-3 and type A.
In the field of computational science and engineering, workflows often entail the application of various software, for instance, for simulation or pre- and postprocessing. Typically, these components have to be combined in arbitrarily complex workflows to address a specific research question. In order for peer researchers to understand, reproduce and (re)use the findings of a scientific publication, several challenges have to be addressed. For instance, the employed workflow has to be automated and information on all used software must be available for a reproduction of the results. Moreover, the results must be traceable and the workflow documented and readable to allow for external verification and greater trust. In this paper, existing workflow management systems (WfMSs) are discussed regarding their suitability for describing, reproducing and reusing scientific workflows. To this end, a set of general requirements for WfMSswere deduced from user stories that we deem relevant in the domain of computational science and engineering. On the basis of an exemplary workflow implementation, publicly hosted at GitHub (https:// this http URL), a selection of different WfMSs is compared with respect to these requirements, to support fellow scientists in identifying the WfMSs that best suit their requirements.