Analytische Chemie
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Paper des Monats
- ja (29)
Anear-infrared (NIR) light-triggered release method for nitric oxide (NO) was developed utilizing core/shell NaYF4: Tm/Yb/Ca@NaGdF4:Nd/Yb up-conversion nanoparticles (UCNPs) bearing a mesoporous silica (mSiO2) shell loaded with theNOdonor S-nitroso-N-acetyl-DL-penicillamine (SNAP). To avoid overheating in biological samples, Nd3+ was chosen as a sensitizer, Yb3+ ions as the bridging sensitizer, andTm3+ ions as UV-emissive activator while co-doping with Ca2+ was done to enhance the luminescence of the activatorTm3+.NOrelease from SNAP was triggered by an NIR-UV up-conversion process, initiated by 808nmlight absorbed by the Nd3+ ions.NOrelease was confirmed by the Griess method. Under 808nmirradiation, the viability of the liver cancer cell line HepG2 significantly decreased with increasing UCNPs@mSiO2-SNAP concentration. For a UCNPs@mSiO2-SNAP concentration of 200 μgml−1, the cell survival probability was 47%. These results demonstrate that UCNPs@mSiO2-SNAP can induce the release of apoptosis-inducingNOby NIR irradiation.
Prozess-Sensoren 4.0 vereinfachen ihre Einbindung über Plug and Play, obwohl sie komplexer werden. Sie bieten Selbstdiagnose, Selbstkalibrierung und erleichterte Parametrierung. Über die Konnektivität ermöglichen die Prozess-Sensoren den Austausch ihrer Informationen als Cyber-physische Systeme mit anderen Prozess-Sensoren und im Netzwerk. Der Aufbruch von der aktuellen Automation zum smarten Sensor hat bereits begonnen. Automatisierungstechnik und Informations- und Kommunikationstechnik (IKT) verschmelzen zunehmend. Wenn die Prozessindustrie dieses nicht definiert, tun es andere.
Für die weitere Entwicklung von der Ist‐Situation zu einer Industrie-4.0-Welt in der Prozessindustrie werden mehrere Szenarien diskutiert. Diese reichen vom erleichterten Abruf sensorbezogener Daten über zusätzliche Kommunikationskanäle zwischen Sensor und mobilen Endgeräten über vollständig bidirektionale Kommunikation bis hin zur Einbindung der Cloud und des Internets in virtualisierte Umgebungen.
Um zu einer störungsfreien Kommunikation aller Sensoren untereinander zu kommen, muss mindestens ein einheitliches Protokoll her, das alle Sensoren sprechen und verstehen. Der derzeit greifbarste offengelegte Standard, der moderne Kommunikationsanforderungen erfüllt, ist OPC Unified Architecture (OPC-UA). Viele halten das Sortieren der Kommunikationsstandards für eines der wesentlichen Errungenschaften von Industrie 4.0.
Eine Topologie für smarte Sensoren, das Zusammenwirken mit daten- und modellbasierte Steuerungen bis hin zur Softsensorik sowie weitere Anforderungen an Sensoren sind jedoch heute noch nicht angemessen beschrieben. Wir müssen jetzt schnell die Weichen für eine smarte und sichere Kommunikationsarchitektur stellen, um zu einer störungsfreien Kommunikation aller Sensoren auf Basis eines einheitlichen Protokolls zu kommen, welches alle Sensoren ausgeben und verstehen.
Aktuelle und zukünftige öffentliche Förderung von Industrie 4.0-Projekten sind eine gute Investition. Wegen der hohen Komplexität und Interdisziplinarität gelingt die Umsetzung nur gemeinsam zwischen Anwendern aus der Prozessindustrie, Software- und Geräteherstellern und Forschungsgruppen. Anwender sind gefragt, diese neue Technologie durch eine beschleunigte Validierung und Akzeptanz umzusetzen. Sie erhalten die einzigartige Chance, ihre Prozesse und Anlagen wettbewerbsfähig zu halten. Kooperativ betriebenen F&E-Zentren und gemeinsam anerkannten Applikationslaboren kommt dafür eine hohe Bedeutung zu.
A new “green” and mild synthesis of highly stable microcrystalline Cs2AgxNa1-xBiyIn1-yCl6 (CANBIC) perovskites under ambient conditions was developed that is scalable to the multi-gram production. Under UV illumination, the CANBIC perovskites emit intense broadband photoluminescence (PL) with a quantum yield (QY) of 92% observed for x = 0.35 and y = 0.01-0.02. The combination of strong UV absorbance and broadband visible emission, high PL QY, and long PL lifetimes of up to 1.4 μs, along with an outstanding stability makes these CANBICs a promising material class for many optical applications.
Currently, research in chemical manufacturing moves towards flexible plug-and-play approaches focusing on modular plants, capable of producing small scales on-demand with short down-times between individual campaigns. This approach allows for efficient use of hardware, a faster optimization of the process conditions, and thus, an accelerated introduction of new products to the market. Driven mostly by the search for chemical syntheses under biocompatible conditions, so-called “click” chemistry rapidly became a growing field of research. The resulting simple one-pot reactions are so far only scarcely accompanied by an adequate optimization via comparably straightforward and robust analysis techniques.
Here we report on a fast and reliable calibration-free online high field NMR monitoring approach for technical mixtures. It combines a versatile fluidic system, continuous-flow measurement with a time interval of 20 s per spectrum, and a robust, automated algorithm to interpret the obtained data. All spectra were acquired using a 500 MHz NMR spectrometer (Varian) with a dual band flow probe having a 1/16-inch polymer tubing working as a flow cell. Single scan 1H NMR spectra were recorded with an acquisition time of 5 s, relaxation delay of 15 s. As a proof-of-concept, the thiol-ene coupling between N-boc cysteine methyl ester and allyl alcohol was conducted in non-deuterated solvents while its time-resolved behaviour was characterised with step tracer experiments.
Through the application of spectral modeling the signal area for each reactant can be deconvoluted in the online spectra and thus converted to the respective concentrations or molar ratios. The signals which were suitable for direct integration were used herein for comparison purposes of both methods.
Currently research in chemical manufacturing moves towards flexible plug-and-play approaches focusing on modular plants, capable of producing small scales ondemand with short down-times between individual campaigns. This approach allows for efficient use of hardware, a faster optimization of the process conditions, and thus, an accelerated introduction of new products to the market. Driven mostly by the search for chemical syntheses under biocompatible conditions, so-called “click” chemistry rapidly became a growing field of research. The resulting simple one-pot reactions are so far only scarcely accompanied by an adequate optimization via comparably straightforward and robust analysis techniques. Here we report on a fast and reliable calibration-free online high field NMR monitoring approach for technical mixtures. It combines a versatile fluidic system, continuous-flow measurement with a time interval of 20 s per spectrum, and a robust, automated algorithm to interpret the obtained data. All spectra were acquired using a 500 MHz NMR spectrometer (Varian) with a dual band flow probe having a 1/16 inch polymer tubing working as a flow cell. Single scan 1H spectra were recorded with an acquisition time of 5 s, relaxation delay of 15 s. As a proof-of-concept, the thiol-ene coupling between N-boc cysteine methyl ester and allyl alcohol was conducted in non-deuterated solvents while its time-resolved behaviour was characterised with step tracer experiments Through the application of spectral modeling the signal area for each reactant can be deconvoluted in the online spectra and thus converted to the respective concentrations or molar ratios. The signals which were suitable for direct integration were used herein for comparison purposes of both methods.
Currently research in chemical manufacturing moves towards flexible plug-and-play approaches focusing on modular plants, capable of producing small scales on-demand with short down-times between individual cam-paigns. This approach allows for efficient use of hardware, a faster optimization of the process conditions, and thus, an accelerated introduction of new products to the market. Driven mostly by the search for chemical syntheses under biocompatible conditions, so-called “click” chemistry rapidly became a growing field of research. The re-sulting simple one-pot reactions are so far only scarcely accompanied by an adequate optimization via compara-bly straightforward and robust analysis techniques. Here we report on a fast and reliable calibration-free online high field NMR monitoring approach for technical mixtures. It combines a versatile fluidic system, continuous-flow measurement with a time interval of 20 s per spectrum, and a robust, automated algo-rithm to interpret the ob-tained data. All spectra were acquired using a 500 MHz NMR spectrometer (Varian) with a dual band flow probe having a 1/16 inch polymer tubing working as a flow cell. Single scan 1H spectra were recorded with an acquisition time of 5 s, relaxation delay of 15 s.
Currently research in chemical manufacturing moves towards flexible plug-and-play approaches focusing on modular plants, capable of producing small scales on-demand with short down-times between individual cam-paigns. This approach allows for efficient use of hardware, a faster optimization of the process conditions, and thus, an accelerated introduction of new products to the market. Driven mostly by the search for chemical syntheses under biocompatible conditions, so-called “click” chemistry rapidly became a growing field of research. The re-sulting simple one-pot reactions are so far only scarcely accompanied by an adequate optimization via compara-bly straightforward and robust analysis techniques. Here we report on a fast and reliable calibration-free online high field NMR monitoring approach for technical mixtures. It combines a versatile fluidic system, continuous-flow measurement with a time interval of 20 s per spectrum, and a robust, automated algo-rithm to interpret the ob-tained data. All spectra were acquired using a 500 MHz NMR spectrometer (Varian) with a dual band flow probe having a 1/16 inch polymer tubing working as a flow cell. Single scan 1H spectra were recorded with an acquisition time of 5 s, relaxation delay of 15 s.
Currently research in chemical manufacturing moves towards flexible plug-and-play approaches focusing on modular plants, capable of producing small scales on-demand with short down-times between individual campaigns. This approach allows for efficient use of hardware, a faster optimization of the process conditions, and thus, an accelerated introduction of new products to the market [1]. Driven mostly by the search for chemical syntheses under biocompatible conditions, so-called “click” chemistry rapidly became a growing field of research. The resulting simple one-pot reactions are so far only scarcely accompanied by an adequate optimization via comparably straightforward and robust analysis techniques. Here we report on a fast and reliable calibration-free online high field NMR monitoring approach for technical mixtures. It combines a versatile fluidic system, continuous-flow measurement with a time interval of 20 s per spectrum, and a robust, automated algo-rithm to interpret the obtained data. All spectra were acquired using a 500 MHz NMR spectrometer (Varian) with a dual band flow probe having a 1/16 inch polymer tubing working as a flow cell. Single scan 1H spectra were recorded with an acquisition time of 5 s, relaxation delay of 15 s.
Currently research in chemical manufacturing moves towards flexible plug-and-play approaches focusing on modular plants, capable of producing small scales on-demand with short down-times between individual campaigns. This approach allows for efficient use of hardware, a faster optimization of the process conditions, and thus, an accelerated introduction of new products to the market. Driven mostly by the search for chemical syntheses under biocompatible conditions, so-called “click” chemistry rapidly became a growing field of research. The resulting simple one-pot reactions are so far only scarcely accompanied by an adequate optimization via comparably straightforward and robust analysis techniques. Here we report on a fast and reliable calibration-free online high field NMR monitoring approach for technical mixtures. It combines a versatile fluidic system, continuous-flow measurement with a time interval of 20 s per spectrum, and a robust, automated algorithm to interpret the obtained data. All spectra were acquired using a 500 MHz NMR spectrometer (Varian) with a dual band flow probe having a 1/16 inch polymer tubing working as a flow cell. Single scan 1H spectra were recorded with an acquisition time of 5 s, relaxation delay of 15 s. As a proof-of-concept, the thiol-ene coupling between N-boc cysteine methyl ester and allyl alcohol was conducted in non-deuterated solvents while its time-resolved behaviour was characterised with step tracer experiments
Through the application of spectral modeling the signal area for each reactant can be deconvoluted in the online spectra and thus converted to the respective concentrations or molar ratios. The signals which were suitable for direct integration were used herein for comparison purposes of both methods.
Driven mostly by the search for chemical syntheses under biocompatible conditions, so called "click" chemistry rapidly became a growing field of research. The resulting simple one-pot reactions are so far only scarcely accompanied by an adequate optimization via comparably straightforward and robust analysis techniques possessing short set-up times. Here, we report on a fast and reliable calibration-free online NMR monitoring approach for technical mixtures. It combines a versatile fluidic system, continuous-flow measurement of 1H spectra with a time interval of 20 s per spectrum, and a robust, fully automated algorithm to interpret the obtained data. As a proof-of-concept, the thiol-ene coupling between N-boc cysteine methyl ester and allyl alcohol was conducted in a variety of non-deuterated solvents while its time-resolved behaviour was characterized with step tracer experiments. Overlapping signals in online spectra during thiol-ene coupling could be deconvoluted with a spectral model using indirect hard modeling and were subsequently converted to either molar ratios (using a calibrationfree approach) or absolute concentrations (using 1-point calibration). For various solvents the kinetic constant k for pseudo-first order reaction was estimated to be 3.9 h-1 at 25 °C. The obtained results were compared with direct integration of non-overlapping signals and showed good agreement with the implemented mass balance.
Безопасность движения на железнодорожном транспорте обеспечивается широким применением современных компьютеризированных средств неразрушающего контроля (НК), которые требуют квалифицированного персонала для их обслуживания и расшифровки результатов контроля. Персонал, занятый НК элементов инфраструктуры и подвижного состава при их эксплуатации и техническом обслуживании (ремонте), а также в предприятиях, изготавливающих продукцию железнодорожного назначения, включает: инженерные кадры - работников, в функциональные обязанности которых входит организация или организация и выполнение НК (в том числе и разработка технологий и технологической документации по НК), а также расшифровка результатов НК, и рабочих – дефектоскопистов или операторов дефектоскопных тележек.
Система подготовки персонала по НК, действующая на железнодорожном транспорте и реализуемая в ПГУПС кафедрой «Методы и приборы неразрушающего контроля», созданной А.К.Гурвичем в 1977 году, включает профессиональнее обучение, высшее профессиональное образование по направлению «Приборостроение», дополнительное профессиональное образование - повышение квалификации и переподготовку (в том числе, для персонала железнодорожных специальностей).
В соответствии с требованиями действующих нормативных документов подтверждение квалификации производится путем сертификации. Уполномоченный орган по сертификации персонала по НК, создан и функционирует в ПГУПС в рамках системы добровольной сертификации персонала по НК (Руководящий орган – Регистр систем сертификации персонала), деятельность которой в области железнодорожного транспорта управляется и контролируется Технической комиссией по железнодорожному транспорту, включающей представителей Росжелдора, ОАО «РЖД», промышленных предприятий - работодателей, Уполномоченных органов и Экзаменационных центров системы сертификации.
В докладе представлены и проанализированы результаты деятельности кафедры МПНК и Квалификационного центра по НК в ПГУПС.
Оперативная характеристика обнаружения как метод оценки достоверности неразрушающего контроля
(2021)
Оперативные характеристики обнаружения в течение многих лет успешно применяют-ся при оценке достоверности неразрушающего контроля. Основными проблемами для их использования, как и при применении любого из методов оценки достоверности, яв-ляются отсутствие информации о действительной дефектной ситуации и ограниченное количество дефектов в образцах объектов контроля. Дополнительной проблемой постро-ения оперативной характеристики обнаружения является отсутствие информации о раз-мерах дефектов и отсутствие универсального размера для различных типов дефектов.
В статье обобщён опыт построения оперативных характеристик по результатам ультра-звукового контроля.
Бегущие упругие волны часто используются в области неразрушающего контроля для определения механических характеристик материалов. Поскольку склеивание различных материалов является широко используемым методом в автомобильной и авиационной промышленности, необходима надежная система измерения для определения качества таких клеевых соединений. Дисперсионные кривые для многослойных волноводов при наличии клеевых прослоек характеризуются появлением эффекта расталкивания нормальных мод в тех областях, где соответствующие моды для отдельных материалов пересекались бы. Таким образом, в зависимости от качества клеевого соединения расстояние между этими модами изменяется. Используя комбинацию экспериментальных и численных данных, в настоящей работе представлен подход к определению параметра, указывающего на качество клеевого соединения.
Бегущие упругие волны часто используются в области неразрушающего контроля для определения механических характеристик материалов. Поскольку склеивание различных материалов является широко используемым методом в автомобильной и авиационной промышленности, необходима надежная система измерения для определения качества таких клеевых соединений. Дисперсионные кривые для многослойных волноводов при наличии клеевых прослоек характеризуются появлением эффекта расталкивания нормальных мод в тех областях, где соответствующие моды для отдельных материалов пересекались бы. Таким образом, в зависимости от качества клеевого соединения расстояние между этими модами изменяется. Используя комбинацию экспериментальных и численных данных, в настоящей работе представлен подход к определению параметра, указывающего на качество клеевого соединения.
Untersuchungen haben gezeigt, dass sich ältere Schafe gut als Modell für die mi-nimalinvasive Behandlung von Osteoporose eignen [1]. Um einen Behandlungs-effekt nachzuweisen, wird dabei unter anderem die Belastungsfähigkeit des Kno-chens durch Druckversuche an kleinen Zylindern aus den behandelten und unbe-handelten Knochen bestimmt. Diese hatten hier einen Durchmesser von 10 mm und eine Höhe von 13 mm. Für den in-situ Druckversuch wurde eine Deben CT5000 verwendet. In einer Serie von Druckerhöhungen wurden die Proben je-weils tomographiert. Dabei ergab sich zunächst, dass mit der µCT innerhalb der Knochen im oberen und unteren Bereich schon Brüche nachgewiesen werden können, obwohl die gemessene Kraftaufnahmekurve keine Unstetigkeit zeigt. Deswegen wurden die starren Probenaufnehmer der Deben Anordnung durch bewegliche Aufnehmer ergänzt, die eine leichte Verkippung der belasteten Ober-flächen ausgleichen können. Ein Vergleich der gemessenen und der aus den µCT-Daten berechneten Verschiebungsfelder ergab trotz der komplexen Struktur der Knochen gute Übereinstimmungen. Diese Verschiebungen wurden dann mit den aus den µCT Daten simulierten mechanischen Druckversuchen, Von-Mise-Spannungen und daraus berechneten Verschiebungen verglichen. (VGStudioMax Simulation).
In der Masterarbeit wurde ein Screening gegen den CCMV mit einer linearen Peptidbibliothek entwickelt, wobei zwei lineare Binder identifiziert wurden. Das resynthetisierte Peptid wurde auf seine Bindungseigenschaften mittels ELISA und MST untersucht. Aufgrund eines Aminosäurefehlers in der selbst durchgeführten Resynthese des Peptids sind die Ergebnisse nicht vollständig übertragbar. Um eine umsetzbare Cyclusgröße für die Peptidbibliothek zu finden, wurden Ringgrößen mit sechs bis acht Aminosäuren untersucht. Da keiner der gewählten Ringgrößen bevorzugt war, wurde die Ringgröße aus acht Aminosäuren für die Peptidbibliothek gewählt. Der Ringschluss wurde durch die Bildung einer Disulfidbrücke erreicht. Dadurch war die Alkylierung der vorhandenen Thiolgruppe in den Abbruchsequenzen notwendig.
Neben den etablierten Alkylierungsreagenzien Iodessigsäure, Iodacetamid und Acrylamid wurden zwei Epoxide mituntersucht. Hierbei konnte nur bei Acrylamid und Propylenoxid eine vollständige Alkylierung beobachtet werden. Eine synthetische Peptidbibliothek aus zehn Aminosäuren pro Kopplungsschritt und einer Peptidlänge von acht Aminosäuren wurde erfolgreich nach der Split-and-Mix-Synthese hergestellt. Neben den kanonischen Aminosäuren wurde die synthetische Aminosäure 3-(3-Pyridyl)-alanin in die Peptidbibliothek mit eingebaut. Peptidsequenzen aus der cyclische Peptidbibliothek konnte mittels MALDI-TOF-MS identifiziert werden. Es konnte außerdem gezeigt werden, dass synthetische Aminosäuren mit proteinogenen Aminosäuren erfolgreich übersetzt werden. Anschließend wurde das entwickelte Screening auf eine cyclische Peptidbibliothek übertragen. Dabei konnte kein Binder identifiziert werden, da zu viele Nebenreaktionen auftraten. Ein alternativer Ringschluss über die Seitenketten von Lysin und Cystein wurden mit ortho-Phthaldialdehyd und 2,4,6-Trichloro-1,3,5-triazin (Cyanurchlorid) untersucht. Beide Bedingungen wiesen keinen erfolgreichen Ringschluss auf. Obwohl der Ringschluss über die Seitenketten von Lysin und Cystein nicht erfolgreich war, sollte ein Austausch von Cystein angestrebt werden, so dass kein freies Cystein in den Abbruchsequenzen vorhanden ist und die Alkylierung überflüssig wäre. Der Ringschluss durch Verwendung anderer Seitenketten bietet einen vielseitigen Ansatz.
Mechanische Eigenschaften von Materialien im Mikro- und Nanobereich werden heute mit der Instrumentierten Eindringprüfung bestimmt. Das Verfahren ist bereits umfangreich in der DIN EN ISO 14577 Teil 1-4 genormt. Im Ergebnis des EU EMRP Projekts Dynamic mechanical properties and long-term deformation behavior of viscous materials (MEPROVISC)“ wurden die zwei neuen Normprojekte für die Instrumentierte Eindringprüfung „Linear elastische dynamische Eindringprüfung“ und „Eindringkriechen und zeitabhängige Eigenschaften“ vorgeschlagen und mit deren Bearbeitung im ISO/TC 164/SC3 Hardness Testing begonnen.
Ausgehend von der Darstellung der wesentlichen Ergebnisse des Projekts MEPROVISC werden die Grundzüge der neuen Normen in Bezug auf Kalibrierung, Methodik, Auswertung und Bestimmung der Messunsicherheit erläutert. Weiterhin werden die Möglichkeiten der aktiven Mitarbeit an diesen Normprojekten aufgezeigt.
Zuverlässigkeitsbetrachtungen bei der Ultraschallprüfung von Radsatzwellen im Ausbildungsbetrieb
(2019)
Im Rahmen der UT1-M1 Ausbildung im Ausbildungszentrum Wittenberge der DGZfP wurden statistische Untersuchungen am Beispiel der Radsatzwellenprüfung mit Testradsatzwellen durchgeführt. Diese Untersuchungen hatten zum Ziel, die wesentlichen Einflussparameter bei der Prüfung auf das Prüfergebnis zu evaluieren. Dabei wurde unter anderem die intrinsische Fähigkeit des Prüfverfahrens zum Auffinden verschiedener Reflektorgeometrien ermittelt. Die Ergebnisse der Handprüfung wurden mit Ergebnissen mechanisierter Prüfungen verglichen. Im Rahmen der Zuverlässigkeitsbetrachtung wurden die Probability of Detection (POD) und die Nachweisgrenzen ermittelt.
Ziel dieser Arbeit war es auch, menschliche und organisatorische Einflussfaktoren auf die Ultraschall-Handprüfung von Radsatzwellen zu identifizieren, um Empfehlungen zur Optimierung der Ausbildung auszuarbeiten. Dazu wurden prüfungsbezogene Risiken in der Praxis mittels Fehlzustandsart- und –auswirkungsanalyse (FMEA) analysiert sowie von den Prüfern empfundene Probleme während der Ausbildung und in der Praxis mittels Fragebogen identifiziert. Die Ergebnisse der FMEA haben gezeigt, dass während des gesamten Prozesses Fehler auftreten können, für die Gegenmaßnahmen getroffen und implementiert werden sollten. Aus den Hinweisen und Erkenntnissen wurden einige Empfehlungen zur Optimierung der Ausbildung erarbeitet.
Zuverlässigkeitsbetrachtungen bei der Ultraschallprüfung von Radsatzwellen im Ausbildungsbetrieb
(2019)
Im Rahmen des UT1 E W im Ausbildungszentrum Wittenberge der DGZfPwurden statistische Untersuchungen am Beispiel der Radsatzwellenprüfung mit Testradsatzwellen durchgeführt. Diese Untersuchungen hatten zum Ziel, die wesentlichen Einflussparameter bei der Handprüfung auf das Prüfergebnis zu evaluieren. Im Rahmen der Zuverlässigkeitsbetrachtung wurden die ProbabilityofDetection(POD) und die Nachweisgrenzen ermittelt.Die durchgeführte Studie zeigt, dass die Bewertung der gesamten Zuverlässigkeit der ZfP komplex ist. Dieses verlangt eine detaillierte Versuchsplanung und die Einbeziehung von unterschiedlichen Faktoren, von den Anwendungsparametern bis hin zu den komplexen menschlichen und organisatorischen Faktoren. Die im Rahmen der Studie ermittelten Ergebnisse lassen aufgrund der geringen Anzahl an Testreflektoren keine allgemeingültige Übertragung auf beliebige Korbbogen-geometrienund Reflektorgeometrienzu.
Die zerstörungsfreie Prüfung (ZfP) ist aus solchen Bereichen unseres Lebens nicht mehr wegzudenken, in denen Schäden mit hohen Folgekosten oder Gefährdungen von Menschenleben entstehen können (Beispiele: Transportwesen, Energieerzeugung, Chemieindustrie). In der Praxis kann ein Prüfsystem an seine Grenzen geraten, z.B. bei kleinen Defekten. Defekte mit kritischer Größe werden möglicherweise nicht detektiert. Daher müssen probabilistische Bewertungsverfahren das Prüfsystem beschreiben.
Es wird eine objektive Qualitätskennzahl gesucht, auf deren Basis die Anwendbarkeit der Prüfmethode definiert werden soll. Die Auffindwahrscheinlichkeit (engl. probability of detection - POD) erfüllt diese Anforderung. Die POD zeigt auf Basis des Zusammenhangs und der Streuung der Daten, ob das Verfahren für die Prüftätigkeit akzeptiert werden kann oder noch verbessert werden muss.
Das ursprüngliche POD-Verfahren wurde für quasi eindimensionale Defekte in dünnen Luftfahrtbauteilen entwickelt. In der industriellen Realität ist diese Bewertung ein Balanceakt zwischen Statistik und Durchführbarkeit: Die Prüfung soll mit realen Defektdaten für die spätere Produktion des Bauteils (bzw. wiederkehrende Wartungsprüfung) bewertet werden. Doch die notwendige Gegenüberstellung zwischen Schliffdaten, für die Erfassung der wahren Defektgröße von räumlich ausgeprägten Defekten und dem Signal eines ZfP-Systems stellt sich als herausfordernde und kostenintensive Aufgabe heraus. Sowohl die Aufstellung eines gemeinsamen Koordiantensystems als auch die Beschreibung und Angleichung der Daten stellen eine notwendige Vorarbeit dar. In dieser Arbeit wird ein mögliches Vorgehen entwickelt, dass im Weiteren eingesetzt werden kann. Während in der Literatur zum Thema POD häufig die Begrenzung des Einsatzes einer eindimensionalen POD (POD mit einem Defektparameter) für reale Defekte bereits erkannt wurde, soll außerdem in dieser Arbeit das Verfahren auf der Signalseite umfassender erweitert werden, um die Einbeziehung realer Defekte in die POD-Bewertung zu ermöglichen. Hierfür werden mit Hilfe dieser Arbeit zwei wesentliche Neuerungen in der POD-Bewertung eingeführt:
1. Die Anzeigenfläche wird als wichtiges Indiz zur Detektion in die Bewertung eingeführt. Dabei zeigt der Ansatz einer Observer-POD, bei dem der Detektierbarkeit eines Defekts beschrieben wird, eine Möglichkeit in die Bewertung zu erweitern. Jedoch wird die notwendige Datenanzahl die für eine Observer-POD selten mit Experimenten erreicht. Daher schlagen wir die Einführung eines Glättungsalgorithmus vor, um auch auf der Basis von wenigen Daten die Flächenabhängigkeit zu erfassen. Der Algorithmus wird hierbei durch simulierte Daten auf seine Funktionsfähigkeit überprüft, bevor er auf reale Defekte angewendet wird. Gleichzeitig helfen die simulierten Daten einen Vergleich zu den vorhergegangenen Ansätzen zu ermöglichen.
2. Darüber hinaus reichen die Daten der realen Defekte häufig nicht aus, um die statistische Forderung zu gewährleisten, so dass es notwendig, wird künstliche Defekte mit einzubeziehen. Deshalb sollen die vorhanden künstlichen Defekte in Form von Referenzdefekten mit einbezogen werden, um die statistische Grundlage zu erhöhen. Für die Prüfung von Referenzdefekten sind jedoch wichtige Einflussgrößen (z.B. Oberflächenrauhigkeit) nicht vorhanden. Wegen der unterschiedlichen Aussagekraft der Daten und zur Vermeidung einer zu optimistischen Abschätzung, ist eine einfache Mischung der Daten ausgeschlossen. Um realen Defekten eine Möglichkeit dafür zu schaffen, dass die Eigenschaften der realen Defekte angemessen auf das Ergebnis der Bewertung des Verfahrens Einfluss nehmen können, wird eine gewichtete Kombination der Defektdaten für die Bewertung vorgestellt. Das Vorgehen wird am Beispiel der radiographischen Prüfung einer elektronenstrahlgeschweißten Naht durchgeführt. Die Schweißnaht verbindet den Deckel zur Außenwand eines Kupferbehältern, der für die spätere Endlagerung von verbrauchten Brennstäben aus Kernkraftwerken entwickelt wurde. Die Messergebnisse stammen aus von der Firma Posiva Oy, dem zuständigen Unternehmen für die Endlagerung von verbrauchten Brennstäben aus Kernkraftwerken in Finnland. Hierbei stellt die POD-Bewertung ein wichtiges Element in der Gesamtrisikobewertung für das Endlagersystem dar.
"Die effiziente Verwendung von Messergebnissen bei der Nachrechnung und von Ergebnissen aus zerstörungsfreien Prüfungen im Speziellen setzt voraus, dass die Relevanz der messbaren Informationen beziffert, die Qualität der gemessenen Information berechnet und die Anforderungen an die Genauigkeit der Inspektionen aus der statischen Berechnung abgeleitet werden können. Der Vergleich der Anforderungen an eine zu messende Information mit der Qualität der gemessenen Information wird in diesem Aufsatz als Validierung eines Messverfahrens aufgefasst. Es wird gezeigt, wie zerstörungsfreie Prüfverfahren für die Nachrechnung validiert werden können. Die Methodik wird anhand einer mit der Ultraschallecho- und Impulsradarmethode untersuchten Spannbetonbrücke demonstriert."
Die Alterung bestehender Brückenbauwerke fällt mit dem sich verschlechternden Zustand und zunehmenden Anforderungen an die Bausubstanz zusammen, die eine Folge von steigenden Verkehrszahlen und der Zulassung des Schwerlastverkehrs sind. Der daraus erwachsende Bedarf an Beurteilungen von bestehenden Brücken ist national und international fortwährend groß. Die Grundlage für Nachrechnungen sind die über das System verfügbaren Informationen. Sowohl die rechnerische Zuverlässigkeit eines Tragwerks als auch die Validität der Ergebnisse hängen im Wesentlichen vom Zustand, also von der Qualität und der Relevanz dieser Informationen ab. Die gezielte Messung von gütebewerteten, relevanten Informationen kann die Urteilsfähigkeit des Beurteilenden über die Zuverlässigkeit eines Tragwerks signifikant steigern. Wünschenswert ist die Erhebung derartiger Informationen ohne signifikante Eingriffe in die Bausubstanz.
Das Ziel der vorliegenden Arbeit ist die Entwicklung und Erprobung einer Vorgehensweise für die probabilistische Beurteilung von bestehenden Bauwerken mit zerstörungsfrei gemessenen Daten und einer Methodik zum objektiven Nachweis der Eignung von zerstörungsfreien Messverfahren zur Anwendung im Zuge einer Nachrechnung. Herausgestellt wird die Eignung der im Guide to the Expression of Uncertainty in Measurement (GUM) publizierten Regeln zur Bewertung der Qualität der gemessenen Informationen, die später im statischen Nachweis verwendet werden sollen. Die Anforderungen an die Basisvariablen, d. h. an die Eingangsgrößen im probabilistischen Nachweis, werden aus den Vorschriften zur Zuverlässigkeitsanalyse mit dem probabilistischen Näherungsverfahren FORM, der First Order Reliability Method, abgeleitet. Darauf basiert die Entwicklung der Schnittstelle zwischen der Messtechnik und der Nachrechnung. Im Kern werden die messdatenbasierten Basisvariablen explizit als Zufallsgrößen bei der Zuverlässigkeitsanalyse berücksichtigt. Die entwickelte Vorgehensweise wird am Beispiel von zwei Spannbetonbrücken und vier Basisvariablen erprobt. In die Nachweise der Biege- und der Querkrafttragfähigkeit sowie in einen Nachweis der Dekompression fließen geometrische Messergebnisse ein, die mithilfe von Radar- und Ultraschallmessungen generiert werden. Ein wichtiger Bestandteil ist die Bildung von Modellen zur Auswertung der Messungen und zur Berechnung der Messergebnisse.
Es wird gezeigt, dass die Einbeziehung der zerstörungsfrei generierten Messergebnisse die Unsicherheit in den Berechnungsmodellen reduzieren und den Grad der Annäherung der Modelle
an die Realität steigern kann. Die Messergebnisse sind zuverlässig und vergleichbar. Umfassende Sensitivitätsanalysen geben Aufschluss über sinnvollerweise zu messende Bauwerksparameter, die einen maßgeblichen Einfluss auf die Tragwerkszuverlässigkeit ausüben. Auf diese Weise wird die Relevanz der Informationen ermittelt. Das Potential derartiger Analysen für die gezielte Planung und Beauftragung von Messungen sowie für die bedarfsgerechte Zuschärfung von initial unzureichenden Berechnungsmodellen erscheint groß. Die messdatenbasierten Modelle können darüber hinaus die Robustheit einer Tragwerksanalyse steigern. Die Berücksichtigung von Messergebnissen ist dann besonders nützlich, wenn zur Beurteilung erforderliche Informationen fehlen oder Zweifel an den verfügbaren Informationen aufgekommen sind. Im besten Fall resultiert daraus die Verlängerung von rechnerischen Restnutzungsdauern, die Steigerung der Verfügbarkeit der Infrastruktur, die Optimierung des Ressourcenverbrauchs und insgesamt eine realitätsnahe Bauwerksbewertung.
Der Unterausschuss „Geführte Wellen“ im Fachausschuss „Zustandsüberwachung“ der Deutschen Gesellschaft für Zerstörungsfreie Prüfung (DGZfP) hat in einer Online-Umfrage den aktuellen Stand des Einsatzes geführter Ultraschallwellen für die zerstörungsfreie Prüfung und die Strukturüberwachung (structural health monitoring) ermittelt. Es wurden deutsche und internationale Firmen und Forschungseinrichtungen befragt und mehr als 400 beantwortete Fragebögen ausgewertet.
Die Umfrageergebnisse zeigen deutlich, welche Vorteile geführte Wellen bringen, aber auch welche Probleme zu bewältigen sind, um einen breiteren Einsatz der Verfahren zu ermöglichen. Aus den Ergebnissen werden Schlussfolgerungen für die weitere Ausrichtung der Forschungs- und Entwicklungsarbeiten aber auch von Aktivitäten zur Normung und zur Bewertung der Zuverlässigkeit der Prüfverfahren abgeleitet
Die Vorgehensweise bei der Zertifizierung von Referenzmaterialien in der BAM entsprechend den Regeln des ISO-Guide 35 wird an Beispielen beschrieben. Darüber hinaus wird ein umfassender Überblick über Referenzmaterialien zur Analyse der Nichtmetalle Sauerstoff, Wasserstoff, Stickstoff, Kohle und Schwefel gegeben.
Zinc oxide is a wide bandgap semiconductor with unique optical, electrical and catalytic properties. Many of its practical applications rely on the materials pore structure, crystallinity and electrical conductivity. We report a synthesis method for ZnO films with ordered mesopore structure and tuneable crystallinity and electrical conductivity. The synthesis relies on dip-coating of solutions containing micelles of an amphiphilic block copolymer and complexes of Zn2+ ions with aliphatic ligands. A subsequent calcination at 400 °C removes the template and induces crystallization of the pore walls. The pore structure is controlled by the template polymer, whereas the aliphatic ligands control the crystallinity of the pore walls. Complexes with a higher thermal stability result in ZnO films with a higher content of residual carbon, smaller ZnO crystals and therefore lower electrical conductivity. The paper discusses the ability of different types of ligands to assist in the synthesis of mesoporous ZnO and relates the structure and thermal stability of the precursor complexes to the crystallinity and electrical conductivity of the zinc oxide.
To arrive to sustainable hydrogen-based energy solutions, the understanding of water-splitting catalysts plays the most crucial role. Herein, state-of-the-art hypotheses are combined on electrocatalytic active metal sites toward the oxygen evolution reaction (OER) to develop a highly efficient catalyst based on Earth-abundant cobalt and zinc oxides.
The precursor catalyst Zn0.35Co0.65O is synthesized via a fast microwaveassisted approach at low temperatures. Subsequently, it transforms in situ from the wurtzite structure to the layered γ-Co(O)OH, while most of its zinc leaches out. This material shows outstanding catalytic Performance and stability toward the OER in 1 m KOH (overpotential at 10 mA cm−2 ηinitial = 306 mV, η98 h = 318 mV). By comparing the electrochemical results and ex situ analyses to today’s literature, clear structureactivity correlations are able to be identified. The findings suggest that coordinately unsaturated cobalt octahedra on the surface are indeed the active centers for the OER.
The mechanism of action of zirconium permanent modifiers on graphite surfaces was investigated in order to understand its influence on the analytical signal in atomic and molecular absorption spectrometry (AAS/MAS). For this, the molecule formation of CaF was studied, which is used for the indirect analytical determination of fluorine in high-resolution continuum source graphite furnace molecular absorption spectrometry (HR-CS-GFMAS). The kinetics of this reaction was established by monitoring its molecular spectrum at different atomisation temperatures. An Arrhenius plot showed a pseudo-first order reaction with respect to fluorine (n = 1). An intermediate state was isolated, and its structure was elucidated by spectroscopic methods: scanning electron microscopy with energy dispersive X-ray spectroscopy (SEMEDX), X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XANES and EXAFS), and Raman microspectroscopy. We propose here a mechanism, where ZrO2 acts as a heterogeneous catalyst: after a pyrolytic step, an intermediate state of ZrO(OCaF) is activated, and at higher temperatures, CaF(g) is released from the zirconium-coated graphite surface. No evidence of the formation of zirconium carbide was found. Consequently, as the CaF formation is catalysed by a heterogeneous catalyst, surface modifications with ZrO2 nanoparticles and ZrO xerogels were investigated in order to increase the surface area. Their influence was evaluated in the molecule formation of CaF, CaCl, CaBr, and CaI. Graphite furnace modification with zirconium oxide nanoparticles proves to be the best choice for fluorine analysis with a signal enhancement of more than eleven times with respect a non-coated graphite furnace. However, the influence of zirconium modifications in the analytical signals of Cl, and I is lower than the F signals or even negative in case of the Br. Understanding zirconium modifiers as heterogeneous catalysts offers a new perspective to AAS and MAS, and reveals the potential of surface analytical methods for development of improved permanent modifiers and graphite furnace coatings.
This paper reports the formation of zinc phosphate nanoparticles from the artificial digestion of zinc chloride. Initially, the formation of amorphous primary particles with a mean radius of 1.1 nm is observed, alongside the formation of larger, protein stabilized aggregates. These aggregates, with a radius of gyration of 37 nm, are observed after 5 minutes of exposure to artificial saliva and are shown to be colloidally stable for a minimum time of two weeks. The initially formed primary particles are thought to consist of amorphous zinc phosphate, which is then transformed into crystalline Zn3(PO4)2·4H2O over the course of two weeks. Our results demonstrate that the interaction of inorganic salts with bodily fluids can induce the formation of de novo nanoparticles, which in turn, provides insights into how zinc‐enriched foods may also facilitate the formation of nanoparticles upon contact with saliva. As such, this may be considered as an undesirable (bio)mineralization.
Zn is known to be located in the reactive centers of various enzymes, which play a major role in the mineralization process at sites where new bone formation occurs. In addition, elevated Zn levels are supposed to increase the proliferation rate of osteoblasts [1] and may lead to a stimulation of bone formation in vitro and in vivo [2]. Consequently, Zn seems to play an essential role in bone formation and mineralization through various pathways. We thus expected Zn levels to be altered at sites of extensive bone formation like in the case of fracture healing.
We measured the same areas on human bone samples with both a scanning confocal synchrotron radiation induced micro X-ray fluorescence (SR-μXRF) at the FLUO beamline (ANKA) and a full-field Color X-ray Camera at the BAMline (Bessy II) setup in order to find the ideal SR-μXRF imaging method to investigate trace element distributions in bone samples. As zinc is a trace element of special interest in bone, the setups were optimized for Zn detection. The setups were compared concerning count rate, required measurement time and resolution. We could show that the ideal method is depending on the element of interest. While for Ca (a major constituent of the bone with a low energy of 3.69keV for K) the Color X-ray Camera provided us with a higher resolution in the plane, for Zn (a trace element in bone) only the confocal SR-μXRF was able to sufficiently image the distribution.
Biopsies of healing osteoporotic fractures (Vertebral compression fractures (VCFs)) were investigated in regard to their Zn distribution. The samples were measured with a confocal SR-μXRF setup with a 10 μm x 15 μm resolution at the FLUO beamline at ANKA. As we found increased Zn levels, which seemed to be accumulated in narrow structures between bone packages we also investigated thin cuts (4 μm thick) of two sample areas with a higher resolution of 1 μm x 1 μm (monochromatic beam with E= 17 keV) at B16 at Diamond SR facility.
We will present the advantages and disadvantages of all three SR-μXRF setups (ANKA FLUO beamline, Bessy II BAMline, and Diamond B16) for imaging elemental distributions in bone with a focus on Zn. We will also show the distribution of Zn in healing VCFs.
Cryoadsorption on the inner surface of porous materials is a promising solution for safe, fast, and reversible hydrogen storage. Within the class of highly porous metal−organic frameworks, zeolitic imidazolate frameworks (ZIFs) show high thermal, chemical, and mechanical stability. In this study, we selected ZIF-8 synthesized mechanochemically by twin-screw extrusion as powder and pellets. The hydrogen storage capacity at 77 K and up to 100 bar has been analyzed in two laboratories applying three different measurement setups showing a high reproducibility. Pelletizing ZIF-8 increases the packing density close to the corresponding value for a single crystal without loss of porosity, resulting in an improved volumetric hydrogen storage capacity close to the upper limit for a single crystal. The high volumetric uptake combined with a low and constant heat of adsorption provides ca. 31 g of usable hydrogen per liter of pellet assuming a temperature−pressure swing adsorption process between 77 K − 100 bar and 117 K − 5 bar. Cycling experiments do not indicate any degradation in storage capacity. The excellent stability during preparation, handling, and operation of ZIF-8 pellets demonstrates its potential as a robust adsorbent material for technical application in pilot- and full-scale adsorption vessel prototypes.
Die ZfP ist im Bauwesen bisher deutlich weniger reguliert (und auch akzeptiert) als in anderen Industriebereichen. Zum Beispiel gibt für die meisten Prüfverfahren weder Normen noch ein allgemein akzeptiertes Ausbildungs- und Zertifizierungssystem.
Dies hat auch Konsequenzen für die Digitalisierung. Im Gegensatz dazu wird im Bauwesen derzeit für viele Bereiche verbindlich ein neues Verfahren zur Unterstützung von Design, Planung, Herstellung und Betrieb eingeführt: BIM (Building Information Modeling). Der Vortrag beleuchtet das Spannungsfeld zwischen dem geringen Organisations- und Standardisierungsgrad und den neuen digitalen Möglichkeiten und stellt den neuen Arbeitskreis zur ZfP 4.0 im Bauwesen vor. Er beleuchtet auch, in welchen Bereichen die ZfP im Bauwesen von Entwicklungen aus „Industrie 4.0“ und der zerstörungsfreien Prüfung in anderen Anwendungsbereichen profitieren kann - z. B. bei Datenformaten, Datenarchivierung und Schnittstellen.
Messen heißt wissen. Dieses Wissen spiegelt die Realität wider und soll den Statiker eines bestehenden Bauwerkes bei der Entscheidungsfindung über die Sicherheit und Zuverlässigkeit der Konstruktion unterstützen. Gegenüber dem Neubauentwurf können bei der Bewertung von bestehender Bausubstanz Sicherheitsreserven genutzt werden, da Unsicherheiten, die beim Bau auftreten können, besser bekannt oder nicht mehr vorhanden sind. Können solche Unsicherheiten genauer bewertet werden, z. B. durch die Feststellung der genauen Lage der Spannglieder bei einer Spannbetonbrücke, so können Sicherheitsbeiwerte reduziert werden, ohne dass es dabei zu Auswirkungen auf das normativ festgelegte Zuverlässigkeitsniveau kommt. Mittlerweile sind Prüfmethoden an Bauwerken wirtschaftlich einsetzbar und auch so leistungsfähig, dass die für die Tragfähigkeit und Gebrauchstauglichkeit wesentlichen Parameter identifiziert werden können. Ein wesentlicher Punkt ist hierbei die Integration derartiger Messergebnisse in Rechenmodelle, die für die Nachrechnung des Bauwerks verwendet werden. Dies können sowohl semiprobabilistische Rechenmodelle als auch vollprobabilistische Modelle sein. Bei semiprobabilistischen Methoden können aus den Messergebnissen Teilsicherheitsbeiwerte berechnet und abgeleitet werden, die dann in den bekannten Nachweisformaten gemäß den Eurocodes und der Nachrechnungsrichtlinie berücksichtigt werden. Bei vollprobabilistischen Nachweisen können die Messdaten in Form von Verteilungsdichtefunktionen mit gemessenen Variationskoeffizienten direkt in das Rechenmodell eingehen.
Im vorliegenden Artikel werden die Ergebnisse des Fragebogens der DGZfP zur Thematik „ZfP 4.0“ vorgestellt und diskutiert. Die Befragung zielte darauf ab, das allgemeine Verständnis der ZfP-Community zur Begrifflichkeit „ZfP 4.0“ herauszuarbeiten und daraus Bedarfe und Handlungsempfehlungen für die identifizierten Herausforderungen abzuleiten. Außerdem zeigt sich aus Sicht der Autor*innen, dass relevante Terminologien zu dem Themenkomplex Digitalisierung einer weiteren Klärung bedürfen, was im Bericht aufgegriffen wird. Im Ausblick zu den angelaufenen Arbeiten im nationalen Fachausschuss ZfP 4.0 und in den sich etablierenden internationalen Fachkreisen werden daraus abgeleitete Perspektiven für die Zukunftsgestaltung vorgestellt.
Im Zeitalter von Industrie 4.0 muss die zerstörungsfreie Prüfung (ZfP) mit den Anforderungen Schritt halten. Eine erfolgreiche Umsetzung von Digitalisierung, Automatisierung, komplexen Vernetzungen, künstlicher Intelligenz, Assistenzsystemen, intelligenten Sensortechnologien etc. hängt in hohem Maße mit einer erfolgreichen und optimalen Mensch-Maschine-Interaktion (MMI) zusammen. Auf dem Gebiet der ZfP wurde erkannt, dass mit zunehmender Automatisierung neue Herausforderungen in Bezug auf die Mensch-Maschine-Interaktion entstehen können: Herausforderungen, die angegangen werden müssen.
Der neu gegründete DGZfP FA "ZfP 4.0" hat sich diesem Thema angenommen und einen Unterausschuss (UA) zur Mensch-Maschine-Interaktion gegründet. Die Ziele dieses Unterausschusses bestehen darin, das Bewusstsein für die Mensch-Maschine-Interaktion in der ZfP zu sensibilisieren, sowie die Akzeptanz neuer Technologien in Hinblick auf Mensch-Maschine-Systeme und deren Umsetzung zu schaffen, um die Zuverlässigkeit und die Effektivität (Kostenreduktion + Sicherheit) der Mensch-Maschine-Systeme durch optimierte Mensch-Maschine-Interaktion zu gewährleisten. Einige der Themen, mit denen sich dieser UA auseinandersetzten möchte, sind: Entwurf und Entwicklung neuer Schnittstellen, Implementierung neuer Schnittstellen, Optimierung bestehender Technologien und Schnittstellen, Ausarbeitung von Technologien für das optimale MMI, Berücksichtigung der Zuverlässigkeit des gesamten Mensch-Maschine-Systems, Ausarbeitung der Inhalte für die Ausbildung, Wissenstransfer zwischen Disziplinen (z. B Psychologie, Ingenieurwesen, ZfP), usw.
Ziel dieses Vortrags ist es, Herausforderungen zu beschreiben, die Mensch-Maschine-Systeme im Zeitalter von ZfP 4.0 begegnen könnten. Dazu gehören beispielsweise Vertrauen in automatisierte Systeme, Out-of-the-Loop-Phänomene, Verlust von Fähigkeiten, Akzeptanz der Automatisierung, Usability, usw.
Im Zeitalter von Industrie 4.0 muss die zerstörungsfreie Prüfung (ZfP) mit den Anforderungen Schritt halten. Die erfolgreiche Umsetzung von Digitalisierung, Automatisierung, komplexer Vernetzung, künstlicher Intelligenz, Assistenzsystemen, intelligenten Sensortechnologien usw. hängt stark mit einer erfolgreichen und optimalen Mensch-Maschine-Interaktion (MMI) zusammen. In der ZfP 4.0 wird sich die Rolle des Prüfers zum flexiblen Problemlöser und Entscheider verändern. Dieser Wandel wird andere Anforderungen an die Prüfer stellen und eine andere Organisation der Prüfung, Ausbildung etc. erfordern. Der Mensch wird also weiterhin im Mittelpunkt der ZfP stehen. Zu den Herausforderungen, die dieser Wandel mit sich bringen wird, gehören das Vertrauen in automatisierte Systeme und die Akzeptanz neuer Technologien, für die Wege gefunden werden müssen, um sie zu bewältigen.
Dieser Bericht beschreibt die Zertifizierung von 3 synthetischen Isotopenmischungen aus natürlicher und angereicherter Borsäure. Diese Isotopen-ZRM liegen als konzentrierte, wäs-serige Borsäure-Lösungen vor und sind bezüglich ihrer Isotopenzusammensetzung zertifi¬ziert. Der Bor-Gesamtgehalt ist als Richtwert angegeben. Die Unsicherheiten sind erweiterte Messunsicherheiten mit k=2. Sie sind in Klammern angegeben und beziehen sich auf die letzten beiden Stellen. Die vorliegenden Isotopen-ZRM sind bezüglich ihrer Isotopenzu¬sam-mensetzung mit erweiterten relativen Messunsicherheiten kleiner 0,12% zertifiziert. Die ab-solute, kombinierte Standardunsicherheit des prozentualen Stoffmengenanteils der Isotope (Isotopenhäufigkeit) liegt zwischen 0.012 und 0.017.
Dieser Bericht beschreibt die Zertifizierung einer synthetischen Isotopenmischung aus natürlicher und angereicherter Borsäure. Dieses Isotopen-ZRM liegt als konzentrierte, wässerige Borsäure-Lösung vor und ist bezüglich ihrer Isotopenzusammensetzung zertifiziert. Der Bor-Gesamtgehalt ist als Richtwert angegeben. Die Unsicherheiten sind erweiterte Messunsicherheiten mit k=2. Sie sind in Klammern angegeben und beziehen sich auf die letzten beiden Stellen. Das vorliegende Isotopen-ZRM ist bezüglich der Isotopenzusammensetzung mit erweiterten relativen Messunsicherheiten kleiner 0,08% zertifiziert. Die absolute, kombinierte Standardmessunsicherheit des prozentualen Stoffmengenanteils der Isotope (Isotopenhäufigkeit) liegt bei 0,014. In diesem Zertifizierungsbericht wird nur auf die Kapitel eingegangen, die abweichend vom bestehenden Zertifizierungsreport für die Referenzmaterialien BAM I001 bis BAM I003 sind und Einfluss auf die Endergebnisse haben. Dabei handelt es sich um die Kapitel 3.3, 3.4, 4, 6, 7 und 8, Die Kapitel 1, 2, 3, 3.1, 3.2, 5, 9 und 10 des alten Zertifizierungsberichts für die Referenzmaterialien BAM I001 bis BAM I003 behalten unverändert ihre Gültigkeit und sind nicht noch einmal aufgeführt worden.
Ein Ultraschallsystem mit großer Apertur, genannt LAUS – Large Aperture UltraSound, wird vorgestellt und die technischen Eigenschaften erläutert. Es besteht aus zwölf Prüfköpfen, die beliebig auf Betonoberflächen mit Unterdruck befestigt und jeweils als Sender oder Empfänger genutzt werden. Alle möglichen Kombinationen ergeben 132 Einzelmessungen, die zur Rekonstruktion des durchschallten Volumens genutzt werden. Das System wurde an zwei Bauwerken erfolgreich erprobt. Die Dicke einer sehr stark bewehrten Fundamentplatte eines Fallturms wurde bestimmt. Die Messungen erfolgten in einem Raster auf einer Fläche von 2,0 × 1,8 m2 und die Rückseite konnte eindeutig abgebildet werden. Weitere Anzeigen aus dem Inneren der Platte zeigen das Potenzial des Systems. An einem Brückenbauwerk wurden indirekt Verdichtungsmängel lokalisiert. Dazu wurden mit dem LAUS-System die im Brückenträger verlaufenden Spannkanäle durch fast 2 m Beton abgebildet.
Die Risstiefenbestimmung in Festen Fahrbahnen ist hinsichtlich der Dauerhaftigkeit der Konstruktion von wesentlichem Interesse. Im Rahmen eines gemeinsamen Forschungsvorhabens mit der DB AG wurden aus der Literatur bekannte Ansätze bewertet und darauf aufbauend ein Verfahren zur bildgebenden Rissdarstellung entwickelt. Rissüberbrückende Bewehrung sowie Kontaktstellen zwischen den Rissflanken wirken als Schallbrücken und erschweren die Risscharakterisierung, wie bei einem Einsatz an einer Betriebserprobungsstrecke festgestellt wurde. Ein aus der Literatur bekanntes Verfahren der einfachen Laufzeitmessung erwies sich für die Tiefenbestimmung von realen verunreinigten Rissen als ungeeignet.
Die Risstiefenbestimmung in Festen Fahrbahnen ist hinsichtlich der Dauerhaftigkeit der Konstruktion von wesentlichem Interesse. Im Rahmen eines gemeinsamen Forschungsvorhabens mit der DB AG wurden aus der Literatur bekannte Ansätze bewertet und darauf aufbauend ein Verfahren zur bildgebenden Rissdarstellung entwickelt. Rissüberbrückende Bewehrung sowie Kontaktstellen zwischen den Rissflanken wirken als Schallbrücken und erschweren die Risscharakterisierung, wie bei einem Einsatz an einer Betriebserprobungsstrecke festgestellt wurde. Ein aus der Literatur bekanntes Verfahren der einfachen Laufzeitmessung erwies sich für die Tiefenbestimmung von realen verunreinigten Rissen als ungeeignet.
Untersuchungen von Zeichnungen und Manuskripten mit zerstörungsfreien Methoden haben in den letzten Jahren enorm zugenommen. Die nicht-invasiven Analysen ermöglichen Informationen zur Herkunft, zum Herstellungsprozess und möglicherweise zum Alter (direkte Dating nicht möglich, Ausnahme: Papierstruktur, Wasserzeichen). Die zerstörungsfreien Analysen können Rückschlüsse auf mögliche Fälschungen geben, sind neben den offensichtlichen Vorteilen jedoch auch mit einzelnen Limitierungen behaftet. Der Vortrag soll anhand einiger Fallbeispiele die Möglichkeiten aber auch Grenzen bei der zerstörungsfreien (mobilen) Auffindung von Fälschungen aufzeigen.
Metallische Druckgefäße werden aus Gründen der Gewichtseinsparung zunehmend durch Composite-Druckgefäße ersetzt. Während der Alterungsprozess bei metallischen Druckgefäßen durch Wöhlerkurven hinreichend beschrieben wird, ist der Alterungsmechanismus bei Composite-Druckgefäßen noch nicht vollständig geklärt. Im Rahmen des BAM-interne Themenfeldprojekts COD-AGE werden mit diversen Verfahren alterungsbegleitende, zerstörungsfreie Prüfungen an Composite-Druckgefäßen durchgeführt. Im ersten Teil dieses Vortrages werden Ergebnisse der konventionellen und hochfrequenten Wirbelstromprüfung vorgestellt.
Der zweite Teil des Vortrages beschäftigt sich mit der Prüfbarkeit von Kunststoffen aus Kunstharz und 3D-Druck mit dem Wirbelstromverfahren durch Zugabe ferromagnetischer Nanopartikel bzw. Verwendung von ferromagnetischem Filament.
Metallische Druckgefäße werden aus Gründen der Gewichtseinsparung zunehmend durch Composite-Druckgefäße ersetzt. Während der Alterungsprozess bei metallischen Druckgefäßen durch Wöhlerkurven hinreichend beschrieben wird, ist der Alterungsmechanismus bei Composite-Druckgefäßen noch nicht vollständig geklärt. Im Rahmen des BAM-interne Themenfeldprojekts COD-AGE werden mit diversen Verfahren alterungsbegleitende, zerstörungsfreie Prüfungen an Composite-Druckgefäßen durchgeführt. Nach einem kurzen Überblick über die BAM und den FB 8.4 werden zunächst die allgemeine Funktionsweise der Wirbelstromprüfung und die bildgebende Wirbelstromprüfung erklärt. Anschließend werden Ergebnisse der konventionellen und hochfrequenten Wirbelstromprüfung vorgestellt.
Der letzte Teil des Vortrages beschäftigt sich mit der Prüfbarkeit von Kunststoffen aus Kunstharz und 3D-Druck mit dem Wirbelstromverfahren durch Zugabe ferromagnetischer Nanopartikel bzw. Verwendung von ferromagnetischem Filament.
Composite-Druckgefäße für den Gefahrguttransport sowie für Wasserstoff- und Erdgasfahrzeuge bestehen aus einem lasttragenden Composite und einer gasdichten, metallischen oder polymeren Barriereschicht (Liner). Zur Untersuchung des Alterungsverhaltens solcher Composite-Druckgefäße wurde in der BAM das interdisziplinäre Themenfeldprojekt COD-AGE durchgeführt. Ziel des Projektes war die Entwicklung von Methoden und Modellen zur Beschreibung und Bestimmung des Alterungsverhaltens von Carbonfaser-Compositen am Beispiel von Druckgefäßen, um eine bessere Vorhersage der Alterung und der sicheren Gebrauchsdauer zu ermöglichen. Ein Schwerpunkt in diesem Projekt war die Bereitstellung geeigneter ZfP-Methoden. Dabei ging es sowohl um versuchsbegleitende Prüfungen, als auch um die mögliche Entwicklung von Prüfeinrichtungen für den späteren praktischen Gebrauch.
In dem Vortrag werden Prüfergebnisse der alterungsbegleitenden Wirbelstromprüfung an Composite-Druckgefäßen vorgestellt.
In Alterungsversuchen wurden Druckgefäße aus einem ca. 4 mm dicken Aluminiumliner und ca. 8 mm dicker CFK-Ummantelung untersucht. Typisches Einsatzgebiet solcher Druckgefäße sind Atemschutzgeräte der Feuerwehr. Die Druckgefäße wurden sowohl mit konventioneller Wirbelstromtechnik von außen und von innen als auch mit hochfrequenter Wirbelstromtechnik von außen geprüft. Es konnten sowohl Beschädigungen des metallischen Liners, als auch Strukturen des CFK-Geflechts nachgewiesen werden. Eine besondere mechanische Herausforderung bestand in der Prüfung der Innenseite der Liner, da hier eine zylindrische Fläche mit einem Innendurchmesser von 150 mm durch einen Zugang von nur 15 mm Durchmesser geprüft werden muss.
Composite-Druckgefäße für den Gefahrguttransport sowie für Wasserstoff- und Erdgasfahrzeuge bestehen aus einem lasttragenden Composite und einer gasdichten, metallischen oder polymeren Barriereschicht (Liner). Zur Untersuchung des Alterungsverhaltens solcher Composite-Druckgefäße wurde in der BAM das interdisziplinäre Themenfeldprojekt COD-AGE durchgeführt. Ziel des Projektes war die Entwicklung von Methoden und Modellen zur Beschreibung und Bestimmung des Alterungsverhaltens von Carbonfaser-Compositen am Beispiel von Druckgefäßen, um eine bessere Vorhersage der Alterung und der sicheren Gebrauchsdauer zu ermöglichen. Ein Schwerpunkt in diesem Projekt war die Bereitstellung geeigneter ZfP-Methoden. Dabei ging es sowohl um versuchsbegleitende Prüfungen, als auch um die mögliche Entwicklung von Prüfeinrichtungen für den späteren praktischen Gebrauch.
In dem Vortrag werden Prüfergebnisse der alterungsbegleitenden Wirbelstromprüfung an Composite-Druckgefäßen vorgestellt.
In Alterungsversuchen wurden Druckgefäße aus einem ca. 4 mm dicken Aluminiumliner und ca. 8 mm dicker CFK-Ummantelung untersucht. Typisches Einsatzgebiet solcher Druckgefäße sind Atemschutzgeräte der Feuerwehr. Die Druckgefäße wurden sowohl mit konventioneller Wirbelstromtechnik von außen und von innen als auch mit hochfrequenter Wirbelstromtechnik von außen geprüft. Es konnten sowohl Beschädigungen des metallischen Liners, als auch Strukturen des CFK-Geflechts nachgewiesen werden. Eine besondere mechanische Herausforderung bestand in der Prüfung der Innenseite der Liner, da hier eine zylindrische Fläche mit einem Innendurchmesser von 150 mm durch einen Zugang von nur 15 mm Durchmesser geprüft werden muss.
In verlegten Eisenbahnschienen entstehen durch Rollkontaktermüdung rissartige Oberflächenschädigungen. Der geschädigte Bereich wird im Rahmen der Schieneninstandhaltung regelmäßig abgetragen, um zu verhindern, dass durch unkontrolliertes Risswachstum schwerwiegende Schienenschäden entstehen. Hierzu werden u. A. Schienenschleifzüge eingesetzt.
Früher wurde das Schleifergebnis einer Sichtprüfung unterzogen. Es kommt jedoch vor, dass Risse in der Oberfläche beim Schleifen zugeschmiert oder durch Schleifriefen maskiert werden, so dass diese nicht mehr sichtbar obwohl noch vorhanden sind.
An der BAM wurde ein Wirbelstromprüfsystem entwickelt, das sowohl zur Planung als auch der Qualitätskontrolle der Schieneninstandhaltung genutzt wird. Dieses System ist in der Lage, Schädigungen zu detektieren und deren Schädigungstiefe zu bestimmen, selbst dann, wenn optisch keine Schädigung zu erkennen ist.
Seit 2013 ist die Qualitätskontrolle mit Wirbelstromprüfsystemen bei der Schienenbearbeitung fest im Regelwerk der DB verankert.
Diese Arbeit beschäftigt sich mit den Eigenschaften der photonenzählenden und spektralauflösenden Detektortechnik und möglichen Anwendungsgebieten in der zerstörungsfreien Prüfung. Dabei wurden konventionelle und photonenzählende Detektortechniken hinsichtlich der Bildqualität und Anwendbarkeit bei unterschiedlichen Prüfaufgaben verglichen und untersucht, inwiefern sich die Energieschwellwertsetzung auf die erreichbare Bildqualität und eine Materialdiskriminierbarkeit bei verschiedenen radiographischen Verfahren auswirkt.
Anhand von Anwendungsbeispielen wurden diese Eigenschaften und deren Auswirkung auf das Messergebnis analysiert. Neben der Radiographie wurden auch dreidimensionale Verfahren wie CT und Laminographie berücksichtigt.
Als eine der wichtigsten Eigenschaften der photonenzählenden Detektortechnik wurden zunächst die Energieauflösung des photonenzählenden Detektors und die Homogenität der Energieantwort über größere Detektorbereiche bestimmt. Dabei stellte sich heraus, dass die Energieauflösung eines abgegrenzten Detektorbereichs ca. 32 % bei 60 keV beträgt und die Streuung in der Energieantwort der einzelnen Detektorbereiche ca. 12 % ausmacht, woraus sich eine Gesamtunsicherheit in der spektralen Detektorantwort von ca. 44 % ergibt. Die geringe Energieauflösung und das stark heterogene Verhalten der Detektorbereiche ergeben sich vor allem aus der Detektorelektronik, welche nur eine globale Energieschwellwertsetzung zulässt.
Trotz dieser Einschränkungen konnte demonstriert werden, dass auch konventionelle radiographische Verfahren, wie Radiographie oder CT, vom Einsatz der photonenzählenden Technik profitieren. So ist es mit dieser Technik möglich, bei sehr geringen Dosisleistungen (z.B. aufgrund der Durchstrahlung großer Wandstärken von dichten Materialien) noch sehr gute Bildqualitäten zu erreichen. Die hohe Dynamik und Kontrastempfindlichkeit dieser Technik begünstigen die Inspektion von Leichtbauwerkstoffen wie Faserverbunde, was anhand von Vergleichen mit herkömmlicher Detektortechnik und anderen ZfP-Verfahren gezeigt werden konnte. Daneben konnte durch den Einsatz der Energieschwellwertsetzung der Einfluss von nicht bildzeichnender Streustrahlung im Röntgenbild um bis zu 20 % reduziert werden. Die Auswirkungen von Aufhärtungseffekten in der CT konnten sogar um bis zu Faktor 1 000 (in der mittleren quadratischen Abweichung), im Vergleich zu herkömmlicher Detektortechnik, reduziert werden.
Der Einsatz von photonenzählender Detektortechnik mit Röntgenblitzröhren ist hingegen nicht sinnvoll, da aufgrund der hohen Photonendichte pro Puls und einer endlichen Totzeit des Detektors in der Größenordnung der Pulsbreite eines Blitzes nur ein geringes Signal detektiert werden kann.
Im Hinblick auf eine Materialdiskriminierbarkeit konnte demonstriert werden, dass im Fall einer Radiographie anhand der Energieschwellwertsetzung im Detektor eine materialstärkenunabhängige Diskriminierung zwischen zwei Materialien (hier: Al und Fe) erzielt werden kann. Unter Einsatz mehrerer Energiefenster und eines Verfahrens der explorativen und multivariaten Datenanalyse konnte eine materialaufgelöste CT eines Multi-Material-Phantoms erreicht werden, wobei die Schwächungskoeffizienten der enthaltenen Materialien im relevanten Energieberiech teilweise sehr dicht beieinander lagen.
Neben Radiographie und CT wurde auch die Möglichkeit einer materialaufgelösten Laminographie am Beispiel eines glasfaserverstärkten Rotorblatts untersucht. Anhand der Energieschwellwertsetzung war nicht nur eine eindeutige Trennung der Glasfasern von der Epoxidharzmatrix möglich, sondern auch eine signifikante Reduzierung der durch die Laminographie entstandenen Artefakte. Der damit verbundene Gewinn an Information führt zu einer verbesserten Aussagefähigkeit des Untersuchungsergebnisses, was letztendlich eine gesteigerte Betriebssicherheit zur Folge hat.
Dieses erste Memorandum zur Lehre und Forschung an deutschsprachigen Hochschulen auf dem Gebiet der zerstörungsfreien Prüfung im Bauwesen gibt einen Überblick hinsichtlich der akademischen Ausbildung und zeigt mögliche Schwerpunkte vor allem in der Lehre auf. Diese Schwerpunkte berücksichtigen auch aktuelle Entwicklungen und Themen auf dem Gebiet der Forschung. Es werden Anregungen zur Entwicklung bzw. Weiterentwicklung der Lehr-Curricula im Hinblick auf eine umfassende und solide fachliche Ausbildung der Studierenden des Bauwesens und angrenzender Fachrichtungen gegeben. Inhaltlich und formal lehnt sich der Beitrag an dem Memorandum der Hochschullehrer im Fachgebiet „Werkstoffe im Bauwesen“ (Breit et al., 2012) an und beruht auf einer Initiative des Unterausschusses Ausbildung – Arbeitsgruppe Ausbildung in der Hochschule – des Fachausschusses ZfP im Bauwesen der Deutschen Gesellschaft für zerstörungsfreie Prüfung (DGZfP). Die Hauptredaktion wurde übernommen von Prof. Christian U. Grosse (TU München) und Prof. Ralf W. Arndt (FH Erfurt).
Inhalt der Präsentation:
- Einführung in das Prinzip der Laufzeitmessung
- Vorteile bei der Anwendung von Volumenverfahren an Spannbetonbrücken
- Möglichkeiten zur Beurteilung der Leistungsfähigkeit von ZfP-Verfahren und zur Verwendung der Messergebnisse in probabilistischen Nachweisen von Bestandstragwerken
Die Schwerpunktthemen für die Forschung der BAM im Bereich der zerstörungsfreien Prüfung werden vorgestellt. Es stehen die aktuellen Forschungsprojekte der Fachbereiche 8.1 bis 8.7 der Abteilung 8 und des Arbeitsgebietes Probabilistische Sicherheits- und Zuverlässigkeitsanalysen von Frau Dr. Bertovic sowie der Nachwuchsgruppe von Frau JProf. Dr. Kruschwitz im Vordergrund.
Im Rahmen eines FE-Projektes “Inspektion Fester Fahrbahnen“ der BAM und der Deutschen Bahn AG geht es um die Anwendung und weitere Entwicklung zerstörungsfreier Messverfahren zur Beurteilung des Zustandes Fester Fahrbahnen.
Nach ersten Versuchsreihen direkt im Gleis wurden für verschiedene Bauarten die charakteristischen Herstellungsbedingungen simuliert und systematisch untersucht. Die kombinierte Anwendung der drei Messverfahren Ultraschall-Array-, Impakt-Echo- und Impuls-Radar-Verfahren wird hier an dem Beispiel “Betonschwelle in Betoneinbettung” dargestellt.
Im Rahmen eines FE-Projektes “Inspektion Fester Fahrbahnen“ der BAM und der Deutschen Bahn AG geht es um die Anwendung und weitere Entwicklung zerstörungsfreier Messverfahren zur Beurteilung des Zustandes Fester Fahrbahnen.
Nach ersten Versuchsreihen direkt im Gleis wurden für verschiedene Bauarten die charakteristischen Herstellungsbedingungen simuliert und systematisch untersucht. Die kombinierte Anwendung der drei Messverfahren Ultraschall-Array-, Impakt-Echo- und Impuls-Radar-Verfahren wird hier an dem Beispiel “Betonschwelle in Betoneinbettung” dargestellt.
Naturwissenschaftliche Verfahren sind zunehmend von Bedeutung bei der Untersuchung von Kunst- und Kulturgut und der Entwicklung von Konservierungskonzepten. Neben bildgebenden Verfahren sind materialanalytische Methoden von großer Wichtigkeit. Mobilen, zerstörungsfreien Verfahren ist grundsätzlich den Vorzug zu geben. Es ist jedoch zu konstatieren, dass Probenentnahmen unumgänglich sind, wenn spezielle Fragen an die Materialanalyse gestellt werden.
Die Idee des Dissertationsprojekts ist der parallele Einsatz des Radarverfahrens und der Neutronensonde zur Lokalisierung von Feuchteschäden in Fußbodenaufbauten. Hierbei soll die integrale Messweise der Neutronensonde durch die vertikale Information des Radarsignals ergänzt werden, um zukünftig auf zerstörende Sondierungsbohrungen verzichten zu können. Primäres Ziel ist eine automatisierte und zerstörungsfreie Klassifizierung und Quantifizierung verschiedener Schadensfälle im Fußboden, welche zur Abschätzung und Auswahl des Sanierungsaufwands dienen soll. In systematischen Laborstudien an modular aufgebauten Referenzprobekörpern werden die Nachweisgrenzen der beiden Verfahren für unterschiedliche, häufig anzutreffende Fußbodenaufbauten untersucht. Hierfür wurde ein Satz verschiedenster Estrichprobekörper gefertigt und deren Hydratisierungsprozess gravimetrisch und mit den benannten Feuchtemessverfahren beobachtet. In der laufenden Auswertung konnten bereits signifikante Signalmerkmale der Radarmessungen extrahiert, sowie dessen Korrelation zum Feuchteverlauf der Proben gezeigt werden. Der modulare Aufbau der Fußbodenschichten zur Simulation von gängigen Feuchteschäden folgt im Anschluss. Über Datenfusion und Signalverarbeitung sollen so innovative Auswertungsansätze entwickelt und deren Validität an realen Schadensfällen geprüft werden.
Das Neutronensondenverfahren wird bereits seit vielen Jahren erfolgreich zur Eingrenzung und Quantifizierung auftretender Feuchteschäden an Fußböden eingesetzt. Hierzu bedarf es jedoch einer Vielzahl zerstörender Sondierungsbohrungen, welche die gewonnenen Messdaten kalibrieren und eine Tiefenzuordnung des Flüssigwassers zulassen. Dadurch entsteht ein zeitlicher und finanzieller Aufwand, der durch den parallelen Einsatz des elektromagnetischen Radarverfahrens vermieden werden könnte. Mit seiner hohen Sensitivität für Wasser bietet diese Messmethode die Möglichkeit der vertikalen Lokalisierung von Feuchte, was zu einer automatisierten Klassifizierung typischer Schadensfälle beitragen soll.
In einem laufenden Forschungsvorhaben werden in systematischen Laborstudien gängige Schadensfälle an häufig anzutreffenden Fußbodenaufbauten simuliert und deren Einfluss auf die genannten Verfahren untersucht. Hierbei kommen Zement- und Anhydritestriche, sowie unterschiedliche Dämmmaterialen mit variierenden Schichtdicken zum Einsatz. Wesentlicher Bestandteil der Auswertung ist die Extraktion signifikanter Signalmerkmale des Radarverfahrens, welche Rückschlüsse auf den Schadensfall und ggf. die Wassermenge zulassen. Weiterführend sollen die Kombinationsmöglichkeiten der verschiedenen Signalmerkmale und der Neutronensondendaten durch Methoden der multivariaten Datenauswertung und des maschinellen Lernens geprüft werden. Die Unabhängigkeit gegenüber wechselnden Schichtdicken und Materialien steht hierbei besonders im Fokus und soll anhand der erzielten Ergebnisse evaluiert werden.
Das Neutronensondenverfahren wird bereits seit vielen Jahren erfolgreich zur Eingrenzung und Quantifizierung auftretender Feuchteschäden an Fußböden eingesetzt. Hierzu bedarf es jedoch einer Vielzahl zerstörender Sondierungsbohrungen, welche die gewonnenen Messdaten kalibrieren und eine Tiefenzuordnung des Flüssigwassers zulassen. Dadurch entsteht ein zeitlicher und finanzieller Aufwand, der durch den parallelen Einsatz des elektromagnetischen Radarverfahrens vermieden werden könnte. Mit seiner hohen Sensitivität für Wasser bietet diese Messmethode die Möglichkeit der vertikalen Lokalisierung von Feuchte, was zu einer automatisierten Klassifizierung typischer Schadensfälle beitragen soll.
In einem laufenden Forschungsvorhaben werden in systematischen Laborstudien gängige Schadensfälle an häufig anzutreffenden Fußbodenaufbauten simuliert und deren Einfluss auf die genannten Verfahren untersucht. Hierbei kommen Zement- und Anhydritestriche, sowie unterschiedliche Dämmmaterialen mit variierenden Schichtdicken zum Einsatz. Wesentlicher Bestandteil der Auswertung ist die Extraktion signifikanter Signalmerkmale des Radarverfahrens, welche Rückschlüsse auf den Schadensfall und ggf. die Wassermenge zulassen. Weiterführend sollen die Kombinationsmöglichkeiten der verschiedenen Signalmerkmale und der Neutronensondendaten durch Methoden der multivariaten Datenauswertung und des maschinellen Lernens geprüft werden. Die Unabhängigkeit gegenüber wechselnden Schichtdicken und Materialien steht hierbei besonders im Fokus und soll anhand der erzielten Ergebnisse evaluiert werden.
Die Ermittlung der Belegreife von Fußbodenestrichen ist im Bauwesen von hoher Bedeutung,
da es bei dem Verlegen von Parkett oder anderen Bodenbelägen auf Estrichen zu erheblichen
feuchtigkeitsbedingten Schäden kommen kann, wenn diese noch nicht hinreichend
getrocknet sind. Für die Messung des Feuchtegehalts wird üblicherweise auf zerstörende
Methoden wie das Darr- und CM-Verfahren zurückgegriffen, die Probennahmen erfordern
und nur punktuelle Informationen liefern.
Ziel dieser Forschungsstudie ist die Untersuchung der Eignung und Anwendbarkeit des
Georadars und der Kernspinresonanz (NMR) zur zerstörungsfreien und flächendeckenden
Feuchtemessung von Estrichen. Dazu wurden Messungen mit beiden Verfahren an einer
Gruppe zementgebundener (CT) und einer Gruppe anhydritgebundener (CA) Estriche
während ihres Austrocknungsprozesses bei einem Konstant-Klima durchgeführt. Bei dem
Radarverfahren werden Amplitude und Laufzeit elektromagnetischer Reflexionen, die durch den Wassergehalt beeinflusst werden, gemessen. Die Radarmessungen erfolgten auf jeder
Probe entlang von zwei senkrechten Profilen mit einer 2GHz-Antenne. Die Kernspinresonanz
steht aufgrund ihrer Abhängigkeit zur magnetischen Kernresonanz der 1H-Wasserstoffatomen
in Relation mit dem Wassergehalt in dem Messvolumen der zu untersuchenden
Probe. Die Untersuchungen erfolgten mit dem NMR MOUSE System in Aufsatztechnik.
Dabei liegt die Eindringtiefe bei 24,8 mm.
Bei den Untersuchungen lässt sich für CT-Estriche ein starker vertikaler Feuchtegradient
feststellen. Die CA-Estriche weisen hingegen nur einen schwachen Feuchtegradienten bis
nahezu konstante Amplituden über die gesamte Tiefe auf. Nach Erreichen einer Amplitude
von ca. 5-8 lässt sich keine weitere Amplitudenveränderung registrieren bzw. sind ab diesen
Zeitpunkt die Änderungen im Wassergehalt zu gering, um von der NMR aufgelöst zu werden.
In den Ergebnissen des Radarverfahrens lässt sich ebenfalls ein von dem Feuchtegehalt
abhängiges Verhalten der Messparameter beobachten. Mit zunehmender Trocknung kann
man eine Abnahme der Laufzeit zwischen direkter und an der Rückwand reflektierter Welle
messen. Die Amplituden beider Wellen hingegen nehmen während des Austrocknungsprozesses
zu. Im Gegensatz zur NMR erhält man keine tiefenbezogenen Informationen.
Es lassen sich aber Rückschlüsse auf den Feuchtegehalt im Gesamtvolumen ziehen.
Nuklear magnetische Resonanz (NMR) etabliert sich zunehmend im Bauingenieurwesen als eine alternative Methode zur zerstörungsfreien Feuchtebestimmung in Baustoffen. Schäden, die durch einen zu hohen Anteil an Flüssigwasser auftreten können, sind Ablösungen, Korrosion, Frostschäden, Induktion von Salzkristallisationen, etc. Aufgrund der Sensitivität für 1H-Protonen, ist NMR eine geeignete Methode zur Feuchtedetektion. Dabei kann laut Theorie zwischen frei, chemisch oder physikalisch gebundenem Wasser differenziert werden, während in der Praxis abhängig von der Messtechnik und Probengröße größtenteils nur das freie Wasser detektierbar ist. Mithilfe der NMR Relaxometrie lassen sich nicht nur Relaxationsabklingkurven ermitteln, sondern auch Relaxationszeitenverteilungen, sowie bei Vollsättigung ggf. eine Porengrößenverteilung ableiten. Darüber hinaus lassen sich erste Annahmen über die Entwicklung der Porensättigung bei Teilsättigung der Probe treffen.
Ziel dieser Arbeit war die Untersuchung der zeitlichen Entwicklung der Porensättigung während des natürlichen Trocknungsprozesses (Teilsättigung) sowie die Ermittlung der Porengrößenverteilung an Beispiel von zementgebundenen Estrichen. Für den Versuch wurden zwei zementgebundene Estrichproben nach abgeschlossener Hydratation wieder aufgesättigt. Während des anschließenden natürlichen Trocknungsprozesses wurden regelmäßig NMR-Messungen durchgeführt sowie die Massenentwicklung observiert. Hauptfokus lag auf der zeitlichen und tiefenabhängigen Entwicklung der Relaxationszeitenverteilungen. Bei fortschreitender Trocknung der Proben konnte eine Verschiebung des Maximums der Relaxationszeitenverteilung zu kleineren Zeiten beobachtet werden. Die Ursache liegt zum einen in dem abnehmenden Anteil an freiem Wasser in größeren Poren und zum anderen in dem verhältnismäßig zunehmenden Signalanteil durch Wasser in kleineren Poren.
Durch den Vergleich mit Quecksilberporosimetrie und Gas-Adsorptions-Ergebnissen, konnte aus den NMR-Daten eine unimodale Porengrößenverteilung mit einer dominanten Porengröße von 0,08 bis 0,1 µm und eine effektive Oberflächenrelaxivität von ca. 10 bis 30 µm/s abgeleitet werden.
Mit additiven Fertigungsverfahren hergestellte Bauteile und Produkte aus Kunststoffen werden zunehmend nicht mehr nur als Prototypen, sondern als voll funktionsfähige Bauteile und Produkte gefertigt. Bedingt durch die Fertigungsprozesse und den schichtweisen Aufbau resultieren physikalische Materialeigenschaften, die stark von den Fertigungsparametern abhängen und zudem anisotrop sind. Von den Fertigungsparametern werden auch die Oberflächeneigenschaften beeinflusst, sodass zu erwarten ist, dass sich die Beständigkeit gegenüber äußeren Umwelteinflüssen bei additiv gefertigten Bauteilen von der konventionell gefertigter unterscheiden kann. Nachfolgend wird daher die Entwicklung eines Qualitätssicherungskonzeptes basierend auf spektroskopischen und zerstörungsfreien Prüfverfahren vorgestellt, in dem der Alterungsprozess von mittels Fused Deposition Modelling (FDM) und mittels Lasersintering (LS) hergestellten Probekörpern untersucht wird.
Mit additiven Fertigungsverfahren hergestellte Bauteile und Produkte aus Kunststoffen werden zunehmend nicht mehr nur als Prototypen, sondern als voll funktionsfähige Bauteile und Produkte gefertigt. Bedingt durch die Fertigungsprozesse und den schichtweisen Aufbau resultieren physikalische Materialeigenschaften, die stark von den Fertigungsparametern abhängen und zudem anisotrop sind. Von den Fertigungsparametern werden auch die Oberflächeneigenschaften beeinflusst, sodass zu erwarten ist, dass sich die Beständigkeit gegenüber äußeren Umwelteinflüssen bei additiv gefertigten Bauteilen von der konventionell gefertigter unterscheiden kann. Nachfolgend wird daher die Entwicklung eines Qualitätssicherungskonzeptes basierend auf spektroskopischen und zerstörungsfreien Prüfverfahren vorgestellt, in dem der Alterungsprozess von mittels Fused Deposition Modelling (FDM) und mittels Lasersintering (LS) hergestellten Probekörpern untersucht wird.
Das vorgestellte Projekt beschäftigt sich mit den optischen, thermophysikalischen und mechanischen Materialeigenschaften von additiv gefertigten Kunststoffteilen und deren Alterung. Dazu wurden mittels Fused Layer Modeling (FLM) Probekörper aus ABS hergestellt, die anschließend für drei Monate einer künstlichen Bewitterung unterzogen wurden. Die dabei erzeugte definierte Alterung wurde nach drei Zeitabschnitten jeweils mit zerstörungsfreien Methoden charakterisiert. Dabei wurde neben den spektroskopischen Standardmethoden auch die aktive Thermografie eingesetzt. Die Ergebnisse zeigen, dass sich mittels der Thermografie sowohl chemische Veränderungen als auch mechanische Schädigungen (Fehlstellen) darstellen lassen. Die Bewitterung beeinflusst die Teiltransparenz der Proben zumindest im sichtbaren Spektralbereich, was bei der Charakterisierung der Fehlstellen, die mittels optisch angeregter aktiver Thermografie detektiert wurden, berücksichtigt werden muss.
Es wurden mittels Fused Layer Modeling (FLM) Probekörper aus ABS und mittels Laser Sintering (LS) Probekörper aus PA 12 hergestellt, die anschließend für drei Monate einer künstlichen Bewitterung unterzogen wurden. Die dabei erzeugte definierte Alterung wurde nach drei Zeitabschnitten jeweils mit zerstörungsfreien Methoden charakterisiert. Dabei wurde neben den spektroskopischen Standardmethoden auch die aktive Thermografie eingesetzt. Die Ergebnisse zeigen, dass sich mittels der Thermografie sowohl chemische Veränderungen als auch mechanische Schädigungen (Fehlstellen) darstellen lassen. Die Bewitterung beeinflusst die Teiltransparenz der Proben zumindest im sichtbaren Spektralbereich, was bei der Charakterisierung der Fehlstellen, die mittels optisch angeregter aktiver Thermografie detektiert wurden, berücksichtigt werden muss.
Die Erkenntnisse dienen für die Entwicklung einer Strategie für eine Qualitätskontrolle von additiv gefertigten Kunststoffteilen.
Es wurden Prüfkörper aus additiver Fertigung mittels Laser Sinter Verfahren (Polyamid 12, PA 12) und Fused Layer Modeling (Acrylnitril-Butadien-Styrol, ABS) sowie Prüfkörper aus dem Kunststoff-Spritzguss Verfahren (PA 12 und ABS) über 2000 Stunden künstlich bewittert. Vor, während und nach der Bewitterung erfolgte eine zerstörungsfreie Prüfung mittels Thermografie, optischer Mikroskopie und spektralen Methoden (UV/VIS-Spektroskopie und spektrale Reflexion), um den Alterungsfortschritt zu untersuchen und Schäden durch die künstliche Bewitterung sowie eingedruckte Defekte zu identifizieren und zu detektieren.
Zusätzlich wurden zerstörende Zugprüfungen vorgenommen, welche mit einer IR-Kamera verfolgt wurden. Auf diese Weise konnten lokale Temperaturänderungen, hervorgerufen durch elastische sowie plastische Verformungen, zeitaufgelöst erfasst und ausgewertet werden.
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.
In Berlin befinden sich Fragmente indigener Bilderhandschriften, die Alexander von Humboldt aus Mexiko mitbrachte. Fast alle stammen sie aus der ehemaligen Sammlung des Italieners Lorenzo Boturini, deren Reste heute über mehrere Länder verstreut sind. Der hohe Fragmentierungsgrad sowie ungeklärte Fragen zur Provenienz und Genese der Bruchstücke machen es schwierig, sie zu rekontextualisieren. Um dies dennoch zu erreichen, kommen einander ergänzende moderne natur- und kulturwissenschaftliche Methoden zum Einsatz. Als Beispiel einer Neuzuordnung werden die Humboldt-Fragmente IX-XII vorgestellt. Dass die vier Bruchstücke verwandt sind, wurde schon lange vermutet, nicht jedoch, dass sie zusammen mit einem nicht mehr vorhandenen Mittelteil ein einziges Dokument gebildet haben. Die Gründe für eine derartige Rekonstruktion werden als Ergebnis der Forschungsarbeiten diskutiert.
Der Vortrag widmet sich der „Zentrifugentechnologie zur statistischen Untersuchung von Stumpfklebungen“ und beschreibt drei wesentlich verschiedene Realsysteme (Fügefläche 1/Klebstoff/ Fügefläche 2), um die Statistik ZPM (wiederholte Ein-Proben-Prüfung) vs. CAT (Mehr-Proben-Prüfung) zu vergleichen. Dazu wurden drei unterschiedliche Klebstoff-klassen mit typischen Fügeteilmaterialkombinationen ausgewählt und in einem Vorversuch mit jeweils 3 unterschiedlichen Prüfgeschwindigkeiten sowohl im Weg-geregelten als auch Kraft-geregelten Mode beansprucht. Die Ergebnisse ZPM vs. CAT und Kraft- vs. Weg-Regelung des Vorversuches zeigten keinerlei Unterschiede auf. Im Ergebnis wurde ein Ringversuch im Kraft-geregelten Mode (6xZPM vs. 8xCAT) für ein Referenzsystem durchgeführt, der nachwies, dass die CAT-Technologie statistisch relevante Prüfergebnisse zur Klebfestigkeit bereitstellt. Es zeigte sich, dass für zwei ZPM-Teilnehmer im Vertrauensbereich 99% statistisch signifikant etwas kleinere Werte der Klebfestigkeit bestimmt wurden, was auf geringfügige Abweichungen von der axialen Ausrichtung des eingespannten Prüflings bei der Ein-Proben-ZPM-Zugprüfung zurückgeführt wird.
Das Fügeverfahren Kleben bietet viele Vorteile, wie z.B. das Verbinden unterschiedlicher Materialklassen, geringe thermische Belastung (und damit ggf. verbundene Strukturveränderung/-schwächung) der Fügeteile und eine Lastverteilung über den gesamten Fügebereich. Die Auswahl an verfügbaren Klebstoffen und Vorbehandlungsoptionen sind dabei - wie die Applikationen auch - vielfältig. Es werden vier Applikationsbeispiele zu Referenzklebverbunden aus Edelstahl, zur Plasmaaktivierung von Niedrigenergie-Polymeren, zur Bestimmung der Haftfestigkeit von Lackierungen auf GFK und zur Wirkung von Primern vorgestellt. Einige Polymere weisen z.B. Eigenschaften auf, die eine Herstellung von festen und dauerhaft beanspruchbaren Kleb-verbindungen erschweren. Im Allgemeinen geht dies mit geringen Oberflächenenergien einher. Mittels Oberflächenvorbehandlung, z.B. durch Plasmafeinreinigung bzw. Plasmaaktivierung, können die Grenzflächen solcher Polymere - bezogen auf die Eignung als Fügeteile (Klebfestigkeit) oder als Substrat (Haftfestigkeit) – optimiert bzw. die Oberflächenenergie erhöht werden. Schnelle, zuverlässige und statistisch abgesicherte Prüfverfahren zur Ermittlung von Verbund-eigenschaften sind dabei unverzichtbar.
You Ask – ACEnano Replies
(2020)
The workshop starts with introductory information about the workshop and the H2020 project ACEnano, followed by two expert round tables, focussing on how the project could address regulator and industry needs, respectively. This is be followed by parallel sessions on tools (based on preferences expressed by those registered to attend, see “Questions”) and finally a question-and-answer session with the attendees.
The experts invited in Round Table 1 have been prepared to answer to questions related to obstacles and advantages for stakeholders such as SMEs to use the ACEnano approaches/tools. Standardisation needs are discussed.
XTEM and TFXRD investigations of ohmic Ti/Al/Ti/Au/WSiN contacts on AlGaN/GaN HFET layer systems
(2002)
The microstructural features of the high-temperature-stable ohmic contact system Ti/Al/Ti/Au/WSiN on AlGaN/GaN were investigated using analytical transmission electron microscopy and thin film x-ray diffraction.
For two typical rapid thermal annealing steps at 750 ◦C (non-ohmic behaviour) and 850 ◦C (ohmic behaviour) the intermetallic phases at the metal–semiconductor interface are presented. Increased annealing leads to the transformation of an Al2Au-AlAuTi phase mixture to a mixture of Al2Au-Al3Au8 phases and the formation of Ti-Al-nitride layers at the interfaces. In light of these results the electrical contact properties are discussed.
Recent research has suggested that some of the inks used in Herculaneum papyri do not consist of pure carbon. Starting from this finding, in June 2018 a preliminary campaign of analysis by means of X-Ray fluorescence (XRF) of external portions removed mechanically from their original rolls in the eighteenth century (the so-called scorze) took place at the Biblioteca Nazionale at Naples. Also in this case, the aim of the survey was to investigate the ink composition in order to detect possible traces of metal. This article sums up the results of this survey.
Hundreds of papyrus rolls, carbonized during the 79CE eruption of Mount Vesuvius, were discovered in 1754 at Herculaneum. Sophisticated mechanical methods for unrolling the best-preserved scrolls have been applied, with varying success. However, such processes have been abandoned, to prevent risk from irremediable damage or loss and to preserve the integrity of the extremely fragile rolls. Following the development of X-ray based non-invasive techniques, attempts to virtually unroll the scrolls were made. The most common ink in Antiquity was carbon-based, and the main element of carbonized papyrus is carbon, making these investigations difficult. However, some attempts with synchrotron X-ray phase-contrast tomography (XPCT) were successful. Recently, the identification of antique inks containing metals raised hope that if some of the inks contain metal the rolls can be virtually unrolled using conventional CT- technique. We investigated the inks of a selection of partially unrolled fragments stored at the Biblioteca Nazionale di Napoli with X-ray fluorescence in order to select the best candidates for tomography. Despite the many difficulties (analysis of several layers sticking together, letters barely visible, difficulty to separate contribution from the ink and from the papyrus, inhomogeneity of the support, fragility of the fragments…), encouraging results were found, with a number of inks from Greek fragments found to contain additions to the soot (Fe, Pb, Cu P).
Hundreds of papyrus rolls, carbonized during the 79CE eruption of Mount Vesuvius, were discovered in 1754 at Herculaneum. Sophisticated mechanical methods for unrolling the best-preserved scrolls have been applied, with varying success. However, such processes have been abandoned, to prevent risk from irremediable damage or loss and to preserve the integrity of the extremely fragile rolls. Following the development of X-ray based non-invasive techniques, attempts to virtually unroll the scrolls were made. The most common ink in Antiquity was carbon-based, and the main element of carbonized papyrus is carbon, making these investigations difficult. However, some attempts with synchrotron X-ray phase-contrast tomography (XPCT) were successful. Recently, the identification of antique inks containing metals raised hope that if some of the inks contain metal the rolls can be virtually unrolled using conventional CT- technique. We investigated the inks of a selection of partially unrolled fragments stored at the Biblioteca Nazionale di Napoli with X-ray fluorescence in order to select the best candidates for tomography. Despite the many difficulties (analysis of several layers sticking together, letters barely visible, difficulty to separate contribution from the ink and from the papyrus, inhomogeneity of the support, fragility of the fragments…), encouraging results were found, with a number of inks from Greek fragments found to contain additions to the soot (Fe, Pb, Cu P).
Hundreds of papyrus rolls, carbonized during the 79CE eruption of Mount Vesuvius, were discovered in 1754 at Herculaneum. Sophisticated mechanical methods for unrolling the best-preserved scrolls have been applied, with varying success. However, such processes have been abandoned, to prevent risk from irremediable damage or loss and to preserve the integrity of the extremely fragile rolls. Following the development of X-ray based non-invasive techniques, attempts to virtually unroll the scrolls were made. The most common ink in Antiquity was carbon-based, and the main element of carbonized papyrus is carbon, making these investigations difficult. However, some attempts with synchrotron X-ray phase-contrast tomography (XPCT) were successful. Recently, the identification of antique inks containing metals raised hope that if some of the inks contain metal the rolls can be virtually unrolled using conventional CT- technique. We are presenting here the first results of a preliminary analysis, which aimed at identifying scrolls whose ink contains metals.
xraylib 3.1.0
(2014)
Quantitative estimate of elemental composition by spectroscopic and imaging techniques using X-ray fluorescence requires the availability of accurate data of X-ray interaction with matter. Although a wide number of computer codes and data sets are reported in literature, none of them is presented in the form of freely available library functions which can be easily included in software applications for X-ray fluorescence. This work presents a compilation of data sets from different published works and an xraylib interface in the form of callable functions. Although the target applications are on X-ray fluorescence, cross sections of interactions like photoionization, coherent scattering and Compton scattering, as well as form factors and anomalous scattering functions, are also available.
xraylib provides access to some of the most respected databases of physical data in the field of x-rays. The core of xraylib is a library, written in ANSI C, containing over 40 functions to be used to retrieve data from these databases. This C library can be directly linked with any program written in C, C++ or Objective-C. Furthermore, the xraylib package contains bindings to several popular programming languages: Fortran 2003, Perl, Python, Java, IDL, Lua, Ruby, PHP and .NET, as well as a command-line utility which can be used as a pocket-calculator. Although not officially supported, xraylib has been reported to be useable from within Matlab and LabView.
The source code is known to compile and run on the following platforms: Linux, Mac OS X, Solaris, FreeBSD and Windows.
Development occurs on Github: http://github.com/tschoonj/xraylib
Downloads are hosted by the X-ray Micro-spectroscopy and Imaging research group of Ghent University: http://lvserver.ugent.be/xraylib
Version 3.1.0 release notes:
- Database of commonly used radionuclides for X-ray sources added (new API: GetRadioNuclideDataByName, GetRadioNuclideDataByIndex, GetRadioNuclideDataList and FreeRadioNuclideData)
- numpy Python bindings added, generated with Cython. Performance basically the same as the core C library. (suggested by Matt Newville)
- docstring support added to Python bindings (suggested by Matt Newville)
- Windows SDKs now have support for Python 3.4.
- Windows 64-bit SDK now comes with IDL bindings
- Confirmed support for LabView (thanks to Dariush Hampai!)
- Universal Intel 32/64 bit Framework built for Mac OS X
- Perl support for Debian/Ubuntu
- Several bugfixes: thanks to those that reported them!
The principles of (Hard) X-ray photoelectron spectroscopy and some application in the field of (core-shell) nanoparticles will be presented. The presentation should answer hoe to get reliable results. Furthermore, examples of the correlation between physical-chemical measurments and toxicological results are given which are crucial for the risk assessment of nanoparticles.
The datasets from (Hard Energy) X-ray photoelectron spectroscopy, X-ray diffraction and Scanning Electron Microsopy are related to the publication
G. Chemello, X. Knigge, D. Ciornii, B.P. Reed, A.J. Pollard, C.A. Clifford, T. Howe, N. Vyas, V.-D. Hodoroaba, J. Radnik
"Influence of the morphology on the functionalization of graphene nanoplatelets analyzed by comparative photoelectron spectroscopy with soft and hard X-rays"
Advanced Materials Interfaces (2023), DOI: 10.1002/admi.202300116.
Water and aqueous reagents are essential in any biological process or system. But apart from a few special low vapor-pressure cases, liquids have not been accessible to any technique requiring UHV conditions. EnviroESCA opens up this exciting field of applications.
In this paper first results from water based samples are presented as a proof of concept to demonstrate the special capabilities of EnviroESCA analyzing liquid samples. The following solutions were investigated under near ambient pressure conditions: i.) water, ii.) brine, iii.) an oil in water dispersion, iv.) aqueous iron(II) sulfate heptahydrate, and v.) a suspension of nano silver particles in water.
This application note presents how EnviroESCA can be used to analyze bacterial samples under near ambient pressure conditions in various states of hydration using different levels of humidity. Such investigations of bacterial cell wall surfaces in their hydrated state are essential for studying biological interfaces at work.
The use of innovative near-ambient pressure (NAP-)XPS instrumentation allows the detailed analysis of irregularly-surfaced biofilms. NAP-XPS enables the surface analysis of bacterial samples in their natural hydrated state without complex sample preparation techniques such as freeze-drying or fast-freezing, which are needed for XPS analysis in ultrahigh vacuum.
XPS of GR2M
(2022)
The growing interest in artificial bioorganic Interfaces as a platform for applications in emerging Areas as personalized medicine, clinical diagnostics, biosensing, biofilms, prevention of biofouling, and other fields of bioengineering is the origin of a need for in Detail multitechnique characterizations of such layers and interfaces. The in-depth analysis of biointerfaces is of special interest as the properties of functional bioorganic coatings can be dramatically affected by in-depth variations of composition.
In worst cases, the functionality of a device produced using such coatings can be substantially reduced or even fully lost.
XMI-MSIM 5.0
(2014)
XMI-MSIM is an open source tool designed for predicting the spectral response of energy-dispersive X-ray fluorescence spectrometers using Monte-Carlo simulations. It comes with a fully functional graphical user interface in order to make it as user friendly as possible. Considerable effort has been taken to ensure easy installation on all major platforms.
Development of this package was part of my PhD thesis. The algorithms were inspired by the work of my promotor Prof. Laszlo Vincze of Ghent University. Links to his and my own publications can be found in our manual.
A manuscript has been published in Spectrochimica Acta Part B that covers the algorithms that power XMI-MSIM. Please include a reference to this publication in your own work if you decide to use XMI-MSIM for academic purposes.
A second manuscript was published that covers our XMI-MSIM based quantification plug-in for PyMca. Soon information on using this plug-in will be added to the manual.
XMI-MSIM is released under the terms of the GPLv3.
Development occurs at Github: http://github.com/tschoonj/xmimsim
Downloads are hosted by the X-ray Micro-spectroscopy and Imaging research group of Ghent University: http://lvserver.ugent.be/xmi-msim
Version 5.0 release notes:
Changes:
1. Custom detector response function: build a own plug-in containing your own detector response function and load it at run-time to override the builtin routines. Instructions can be found in the manual.
2. Escape peak improvements: new algorithm is used to calculate the escape peak ratios based on a combined brute-force and variance-reduction approach. Ensures high accuracy even at high incoming photon energies and thin detector crystals. Downside: it's slower…
3. Removed maximum convolution energy option. Was a bit confusing anyway.
4. Number of channels: moved from simulation controls into input-file
5. Radionuclide support added: Now you can select one or more commonly used radionuclide sources from the X-ray sources widget.
6. Advanced Compton scattering simulation: a new alternative implementation of the Compton scattering has been implemented based on the work of Fernandez and Scot (http://dx.doi.org/10.1016/j.nimb.2007.04.203), which takes into account unpopulated atomic orbitals. Provides an improved simulation of the Compton profile, as well as fluorescence contributions due to Compton effect (extremely low!), but slows the code down considerably. Advanced users only. Default: OFF
7. Plot spectra before convolution in results
8. Windows: new Inno Setup installers. Contains the headers and import libraries
9. Windows: compilers changed to GCC 4.8.1 (TDM-GCC)
10. Windows: rand_s used to generate seeds on 64-bit version (requires Vista or later)
11. Windows: new gtk runtime for the 64-bit version (see also https://github.com/tschoonj/GTK-for-Windows-Runtime-Environment-Installer)
12. Mac OS X: compilers changed to clang 5.1 (Xcode) and gfortran 4.9.1 (MacPorts)
13. Original input-files from our 2012 publication (http://dx.doi.org/10.1016/j.sab.2012.03.011) added to examples
14. Updater performs checksum verification after download
15. X-ray sources last used values stored in preferences.ini
16. xmimsimdata.h5 modified: even bigger now...
Bugfixes:
1. Windows: support for usernames with unicode characters. Fixed using customized builds of HDF5. Thanks to Takashi Omori of Techno-X for the report!
2. Spectrum import from file fixes. Was never properly tested apparently
Note:
For those that compiled XMI-MSIM from source: you will need to regenerate the xmimsimdata.h5 file with xmimsim-db. Old versions of this file will not work with XMI-MSIM 5.0.
The quantification of experimental and data analysis errors is most of the times jeopardised by the presence of surface roughness, waviness, as well as by typical measurement artefacts of the XCT technique (for instance refraction at sharp edges). One way to at least estimate the influence of those factors on dimensional measurements and on tolerances is to simulate them using Monte-Carlo method. An alternative strategy is to use independent knowledge (e.g. CMM data) to smoothen/calibrate/correct XCT data.
X-Ray computed tomography (XCT) scan of 11 individual metallic powder particles, made of (Mn,Fe)2(P,Si) alloy. The data set consists of 4 single XCT scans which have been stitched together [3] after reconstruction. The powder material is an (Mn,Fe)2(P,Si) alloy with an average density of 6.4 g/cm³. The particle size range is about 100 - 150 µm with equivalent pore diameters up to 75 µm. The powder and the metallic alloy are described in detail in [1, 2].
The preparation and characterization of a Titanium dioxide (TiO2) by a simple, cost effective, facile and eco-friendly green synthesis method using Peltophorum pterocarpum plant extract is presented. The green synthesized nanoparticles were characterized using X-ray diffraction (XRD), Raman spectroscopy, High-resolution transmission electron microscopy (HR-TEM) and X-ray absorption near edge spectroscopy (XANES). XRD results show that the prepared TiO2 NPs were significantly crystalline with various percentages of anatase and rutile phases. The nanoparticles were found to have different diameters ranging from 20 to 80 nm. No evidence of any intermediate or different TiO2 phases were found in XANES measurements performed at the Ti K- and L-edge. It is shown that the TiO2 NPs with high uniformity, high surface area and minimum aggregation can be prepared with relative ease and the desired anatase: rutile phase ratio can be obtained by controlling the experimental conditions.
XAFS@BAMline
(2018)
X-ray Absorption fine structure spectroscopy (XAFS) is a frequently employed technique in order to investigate structural composition and Change of chemical compounds such as catalytic species or corrosion processes. These structural properties are essential (i) to understand underlying reaction mechanism and (ii) to further improve the design of materials.
While XAFS measurements are usually performed with ionization Chambers or simple fluorescence detectors, we at BAMline specialize in measurements with innovative set-ups that meet Specialrequirements such as time resolution, (3D-) spatial Resolution or demanding sample environments.
This contribution presents various available XAFS configurations with their corresponding applications. In particular, these comprise single -shot XAFS for time- resolved measurements, grazing-exit XAFS with energy and a spatially resolved detector for the characterization of thin films and an in situ grazing incidence Setup for the characterization of corrosion layers.
Additionally,the possibility of analyzing Minute samples in total-reflection geometry is demonstrated.
Until the 1980s radiography was used to inspect civil structures in case of special demands and showed a much better resolution than other NDT techniques. However, due to safety concerns and cost issues, this method is almost never used anymore. Meanwhile, non-destructive techniques such as ultrasound or
radar have found regular, successful practical application but sometimes suffer from limited resolution and accuracy, imaging artefacts or restrictions in detecting certain features when applied to reinforced or prestressed concrete inspection.
Muon tomography has received much attention recently. Muons are particles generated naturally by cosmic rays in the upper atmosphere and pose no risk to humans. Novel detectors and tomographic imaging algorithms have opened new fields of application, mainly in the nuclear sector, but also in spectacular cases such as the Egyptian pyramids.
As a first step towards practical application in civil engineering and as a proof of concept we used an existing system to image the interior of a reference reinforced 600 kg concrete block. Even with a yet not optimized setup for this kind of investigation, the muon imaging results have been at least of similar quality compared to ultrasonic and radar imaging, potentially even better. Recently, the research was expanded to more realistic testing problems such as the detection of voids in certain structural elements. However, before practical implementation, more robust, mobile, and affordable detectors would be required as well as user-Friendly imaging and simulation software.