TY - CONF A1 - Schepers, Winfried A1 - Kulke, D. T1 - Ermittlung dynamischer Bodensteifigkeit aus konventionellen geotechnischen Berichten N2 - Am Beispiel von mehreren Bauvorhaben wird untersucht, mit welchen Unsicherheiten bei der Anwendung von Korrelationen zwischen Sondierergebnissen und Scherwellengeschwindigkeit zur Beschreibung der dynamischen Bodeneigenschaften gerechnet werden muss. Die Auswertung von Korrelationen aus der Literatur zur Abschätzung der Scherwellengeschwindigkeit aus Drucksondierdaten zeigt, dass bei homogenen Sandböden die Verteilung der Scherwellengeschwindigkeit über die Tiefe sehr gut wiedergegeben werden kann. Die Korrelationen haben dabei die Tendenz, den tatsächlichen Wert zu überschätzen. In den vorliegenden Fällen haben sich Überschätzungen zwischen 20 % und 50 % ergeben. Mit zunehmendem Feinkornanteil werden die Unsicherheiten aus den Korrelationen jedoch größer. T2 - 7. VDI-Fachtagung Baudynamik CY - Würzburg, Germany DA - 27.04.2022 KW - Dynamische Bodensteifigkeit PY - 2022 SN - 978-3-18-092379-6 SN - 0083-5560 VL - 2379 SP - 347 EP - 359 PB - VDI-Verlag CY - Düsseldorf AN - OPUS4-54762 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Auersch, Lutz T1 - Wellenausbreitung und Pfähle im inhomogenen Boden – Gesetzmäßigkeiten für die Gründung von Windenergieanlagen und für die Prognose von Bahnerschütterungen aus Tunneln N2 - Es wird eine gekoppelte Finite-Element-Randelementmethode zur Berechnung von Pfahlgrün-dungen in inhomogenen (geschichteten) Böden vorgestellt. Sie beruht auf den Greenschen Funktionen (Punktlastlösungen) für inhomogene Böden. Diese Lösungen können auch für die Wellenausbreitung in der Tiefe, zum Beispiel von einem Bahntunnel zu einem eingebetteten Gebäude, dem Kellergeschoss benutzt werden. Die Punktlastlösungen in der Tiefe werden mit der Halbraumlösung an der Bodenoberfläche und mit der Vollraumlösung verglichen und Gesetzmäßigkeiten für geschichtete Böden abgeleitet. Zu den Pfahlgründungen werden die Horizontalnachgiebigkeiten von Pfählen in geschichteten Böden dargestellt. Für den homogenen und den kontinuierlich steifer werdenden Boden werden Potenzgesetze für den Boden- und Pfahleinfluss aufgestellt. Der Vergleich mit dem Winkler-Modell der rein lokalen Bodenreaktion zeigt, dass die Winkler-Bettung in allen Fällen einen zu kleinen Bodeneinfluss ergibt. T2 - 7. VDI-Fachtagung Baudynamik CY - Würzburg, Germany DA - 27.04.2022 KW - Wellenausbreitung in der Tiefe KW - Nachgiebigkeiten KW - Windenergieanlagen PY - 2022 SN - 978-1-18-092379-6 SN - 0083-5560 VL - 2379 SP - 697 EP - 706 PB - VDI-Verlag CY - Düsseldorf AN - OPUS4-54768 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Plarre, Rüdiger A1 - Busweiler, Sabine A1 - Haustein, V. A1 - von Laar, C. A1 - Haustein, T. ED - Bueno-Mari, R. ED - Montalvo, T. ED - Robinson, W. H. T1 - Korynetes caeruleus (coleoptera: cleridae) for biological control of anobium punctatum (coleoptera, ptinidae) N2 - Larvae and adults of Korynetes caeruleus (de Geer 1775) (Coleoptera: Cleridae) were collected from old churches and reared in the laboratory on Anobium punctatum (de Geer 1774) (Coleoptera, Ptinidea, formerly Anobiidae). Breeding success of K. caeruleus was low, but basic parameters of this species’ developmental cycle were identified. At 21 °C and 75 % relative humidity and a four-month cold period at 4 °C, the development of K. caeruleus from egg to adult appearance lasted 2 years. The pupal stage may be reached and completed after one and a half years. Feeding on larvae of A. punctatum by larvae of K. caeruleus was observed and consisted of a combination of sucking haemolymph and consuming body parts. The sickle-like mandibles of larvae of K. caeruleus penetrate the cuticle of prey larvae followed by pumping and sucking body movements. Adult beetles of A. punctatum were not attacked by K. caeruleus larvae. Feeding behavior of adult K. caeruleus was not investigated. T2 - 10th International Conference on Urban Pests CY - Barcelona, Spain DA - 26.06.2022 KW - Cultural heritage KW - Biological pest control KW - Life history data KW - Wood protection PY - 2022 SN - 978-84-09-41424-6 SP - 34 EP - 44 AN - OPUS4-55170 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schmidt, Martin A1 - Gödde, M. A1 - Salg, S. A1 - Erdt, René T1 - Self-ignition Behaviour of Bulk Materials: How Reliable is the Extrapolation of Laboratory Tests? N2 - The self-ignition behaviour of bulks is usually determined with the aid of isoperibolic or adiabatic hot storage tests; the sample volumes here are typically in the range of approx. 100 cm³ to several litres. The extrapolation to technically relevant volumes holds, however, considerable uncertainties. To reduce these uncertainties, a test stand was set up that allows to investigation sample sizes of up to 1000 dm³. These allow the study of selfignition behavior closer to the conditions that prevail in practice. The suitability (or unsuitability) of the established methods (including dangerous goods classification tests) were to be demonstrated and influencing variables that cannot be measured on a laboratory scale were to be determined. In addition, various analytical methods were used for the determination of reaction kinetic data of solid bulk materials and to predict the self-ignition behaviour of large storages. These are thermal analyses such as differential scanning calorimetry DSC, simultaneous thermal analysis STA as well as microcalorimetry for highprecision measurement of heat flows. Complete test series using all mentioned test methods will be presented for crosslinked polyvinyl-pyrrolidone (PVP) and conclusions regarding the applicability of the extrapolation methods will be discussed. Hot storage tests up to semi-industrial scale and their combination with various thermoanalytical methods allow a much more precise prediction of the self-ignition behaviour of large bulks. A further promising approach to estimate their heat release rates, and hence, the risk of self-ignition under technical conditions, is the use of microcalorimetric methods. T2 - Loss Prevention 2022 CY - Prag, Czechia DA - 05.06.2022 KW - Self-ignition KW - Kinetic data KW - Semi-technical tests KW - Thermoanalytical methods PY - 2022 SN - 978-88-95608-88-4 DO - https://doi.org/10.3303/CET2290049 SN - 2283-9216 VL - 90 SP - 289 EP - 294 PB - AIDIC AN - OPUS4-55079 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wilke, Olaf A1 - Seeger, Stefan A1 - Brödner, Doris A1 - Erdmann, Kerstin A1 - Rasch, Fabian T1 - Chemical characterization of ultra-fine particles released from laser printers N2 - 11 laser printers from 5 manufacturers were purchased in 2017 and tested for their UFP emissions. Size resolved sampling of the emitted particles was done with a 13 stage (30 nm to 10 µm) low pressure cascade impactor. The sampled particles were analysed for their chemical composition by thermal extraction (vaporization at 290°C) followed by GC-MS analysis. High boiling cyclic siloxanes (D10 to D16) were detected as constituents of UFP from laser printers. In comparison to measurements in 2008, aliphatic long-chain alkanes (C22 to C34) were detected additionally as chemical constituents of UFP from most of the tested printers and their amounts were higher than for cyclic siloxanes. Printers of one manufacturer showed very low UPF emissions compared to the other manufacturers. T2 - Indoor Air Conference 2022 CY - Kuopio, Finland DA - 12.06.2022 KW - UFP KW - Thermal extraction KW - Cascade impactor PY - 2022 SP - 1 EP - 4 AN - OPUS4-55106 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Plarre, Rüdiger A1 - Cabral, U. A1 - Querner, P. ED - Ryder, S. ED - Crossman, A. T1 - Screening of two plant-derived extracts from Sri Lanka for their potential to control the subterranean termite Coptotermes formosanus N2 - The tropical environment of Sri Lanka accelerates bio-deterioration of cultural objects. Termites are one of the most damaging insect pests destroying the cellulose components of historical artifacts. Herbal extracts obtained from resin of Vateria copallifera (Retzius) Alston and seeds of Madhuca longifolia (Konig) Macbride have been used for centuries to preserve e.g. palm leaf manuscripts from insect attack. Herbal extractions of these traditional products for palm leaf manuscript were tested for their effect against the termite species Coptotermes formosanus Shiraki, 1909. Natural and artificial aged herbal extractions were tested to obtain a repellent index. Resin oil of V. copallifera caused slightly higher repellencies than M. longifolia. Artificially aged samples produced lower repellencies than naturally aged samples. The results indicate that the active ingredients are volatile. The potential for barrier treatment was tested only with V. copallifera. Tunnelling-behavior of C. formosanus workers through sand in the presence of V. copallifera resin oil was largely reduced. T2 - Pest Odyssey The Next Generation CY - Online meeting DA - 20.09.2021 KW - IPM in museums KW - Termite control KW - Essential oils KW - Library pests PY - 2022 SN - 978-1-909492-83-7 SP - 56 EP - 62 PB - Archetyp Publication LTD CY - London AN - OPUS4-54736 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hufschläger, Daniel A1 - Gaal, Mate T1 - Sending and receiving acoustic waves using atmospheric pressure plasmas N2 - Atmospheric pressure plasmas interact in various physical ways with their surroundings. They release heat and generate charge carriers, which leads to two effects. The first effect is the generation of acoustic waves due to heat release, known as the thermoacoustic effect, and the second effect is the perturbation of the resting fluid provoked by the release of charge carriers, called “ionic wind”. The direct connection between the charge carrier production of the discharge arrangement and the surroundings also allows the detection of acoustic waves by tracking the electrical current of the arrangement. This contribution introduces a multi-fluid model approach to describe the acoustic interaction of atmospheric plasmas. In addition, we present experimental results on commercially available and in-house fabricated discharge arrangements for either emitting or receiving acoustic waves. T2 - DAGA 2022 - 48. Jahrestagung für Akustik CY - Stuttgart, Germany DA - 21.03.2022 KW - Plasma acoustics KW - Atmospheric pressure discharges KW - Ait-coupled ultrasound PY - 2022 SN - 978-3-939296-20-1 VL - 48 SP - 923 EP - 926 CY - Berlin AN - OPUS4-54681 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bischoff, Tristan T1 - Testing and evaluating norms for hot water storage tank efficiency N2 - A round robin test was performed with different laboratories comparing the results for standing heat losses of hot water storage tanks utilizing the current norms for testing. Evaluating these results provides an empirical basis for further developing testing methods. T2 - Conference of young scientists on energy and natural science issues 2022 CY - Kaunas, Lithuania DA - 24.05.2022 KW - Heat storage KW - Standing Losses KW - EU regulations KW - Statistical Analysis KW - Round Robin Test KW - Energy-Label KW - NAPE Project PY - 2022 SN - 2783-6339 SP - 133 EP - 135 AN - OPUS4-55852 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Lu, Xin A1 - Hicke, Konstantin A1 - Krebber, Katerina T1 - Dual functionality of wavelength scanning coherent optical time domain reflectometer N2 - Wavelength scanning coherent optical time domain reflectometer (WS-COTDR) is a good candidate to spatially resolve the environmental information at comparatively low frequency. This paper reveals it can also work as a traditional optical time domain reflectometer (OTDR) to identify Fresnel reflection by averaging the obtained signal over the wavelength scanning range. Simultaneous distributed vibration sensing and a traditional OTDR measurement are experimentally demonstrated using the WS-COTDR system. T2 - European Workshop on Optical Fibre Sensors (EWOFS 2023) CY - Mons, Belgium DA - 23.05.2023 KW - Structural health monitoring KW - Distributed fiber sensing KW - Acoustic sensing PY - 2023 DO - https://doi.org/10.1117/12.2678098 VL - 12643 SP - 1 EP - 4 PB - SPEI AN - OPUS4-57590 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Königsbauer, Korbinian A1 - Wosniok, Aleksander A1 - Nöther, N. A1 - Schaller, M. B. T1 - POF-based digital I-OFDR for strain detection in road construction N2 - We report on the development of a field-proven distributed fiber optic sensing system for structural health monitoring in road construction and civil engineering. The system is based on a cost-efficient digital incoherent optical frequency domain reflectometry (I-OFDR) for distributed strain detection along a polymer optical fiber. In this method, the strain-induced backscatter increase in a graded-index multimode perfluorinated polymer optical fiber (PF-POF) is determined by measuring the complex transfer function of the sensing fiber using a compact digital data acquisition unit. T2 - European Workshop on Optical Fibre Sensors (EWOFS 2023) CY - Mons, Belgium DA - 23.05.2023 KW - Digital I-OFDR KW - Perfluorinated polymer optical fiber KW - Smart geosynthetics KW - Structural health monitoring KW - Road construction KW - Civil engineering PY - 2023 DO - https://doi.org/10.1117/12.2678436 SP - 1264326-1 PB - SPIE AN - OPUS4-57592 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rückschloss, J. A1 - Schischke, K. A1 - Schlegel, Moritz-Caspar A1 - Jonathan, Z. T1 - Too much information? Which labelled product property influences customers' purchasing decisions most N2 - The individual willingness to pay for sustainable products is significantly influenced by the climate crisis, but is also affected due to additional international crises as the still ongoing pandemic and the war in Ukraine. The better a product labelling is designed, the more likely consumers are to make a well-considered purchase decision at the point-of-sale, which in turn increases the product lifetime of the devices. The results of this study are based on two consumer surveys with a total of 590 participants. Consumers were asked to make a simulated purchase decision based on the upcoming EU Energy Label for smartphones. Each consumer was presented comparison labels showing different aspects concerning durability (meaning charging cycles, robustness and IP class), repairability, energy efficiency and product price. In addition, there was a question on energy consumption, which was displayed either in Wh/h or in battery endurance per charge in hours. The analysis of the survey shows a clear ranking of the preferred properties: 1. Durability as best option, Energy efficiency and Repairability as second and third choice. In all categories, a higher price was accepted in favor of a more environmentally friendly product design. When presenting the energy consumption in Wh/h, no reliable distinguishing between higher or lower values was observed. In contrast, higher values were clearly preferred when choosing between different battery runtimes. Recommendations will be developed for adjustments to the upcoming EU Energy Label for smartphones and other product labels in the future showing circular economy aspects, such as the durability, repairability, recycled content used during production, recyclability or the total footprint of the product. T2 - PLATE Product Lifetime and the Environment Conference 2023 CY - Espoo, Finland DA - 31.05.2023 KW - EU Energy Labelling KW - Circular Economy KW - Policy making KW - Electronics KW - Smartphone PY - 2023 SP - 1 EP - 7 AN - OPUS4-57612 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schlegel, Moritz-Caspar A1 - Giegerich, J. T1 - Kicking the can down the Circular Economy Road – Basic needs in Standardization for Electronics- and ICT-products N2 - As consequence of the European Green Deal and the European Commission's Circular Economy Action Plan, the product landscape in the EU will undergo fundamental changes. The legal requirements for products are being expanded, not least through the Proposal for an Ecodesign Regulation for Sustainable Products published by the European Commission in 2022. Following the current developments, requirements for the circularity of products will be increased next to the already existing minimum requirements for products’ energy efficiency. Following this development, the lead question has to be: Is the market, in particular small- and medium-sized enterprises, well prepared for this planned green transformation of our economy? The answer is: No, not yet. What is needed are suitable standards for the implementation of these requirements to reduce additional burdens to an appropriate level and to support fair competition between all market actors concerned. The German Institute for Standardization, the German Commission for Electro-technical, Electronic & Information Technologies and the Association of German Engineers have conducted a review study with the aim of identifying fundamental needs for revising existing standards and for creating new standards - both of which are intended to support and accelerate the transformation of the current economy towards a Circular Economy. More than 700.000 normative documents were analyzed, and the results were discussed and consolidated with more than 1000 experts from manufacturers (organizations), consumer- and environmental organizations as well as from the public sector. As a result, more than 200 gaps in the standardization landscape were identified. In this study, we highlight and analyze the most important needs for standardization activities in the field of electrotechnical-, electronic- and ICT-products. In the discussion with the experts for electrotechnical-, electronic- and ICT products, it has been confirmed that a timely implementation of ambitious political decisions of a circular economy requires a normative basis to ensure its consistency. Furthermore, consensus between experts was that legislation in product regulation would be key and should not be extended to the area of waste legislation. As most important standardization activities accompanying product legislation, the following were identified: (i) creation of a set of indicators enabling a holistic assessment of product circularity, (ii) quality assurance of secondary raw materials and consumers awareness of the product circularity both enabled by appropriate analytics and (iii) clear regulation concerning product liability of repaired, refurbished or remanufactured products. One issue of relevance to all experts concerns the product safety, which must not, under any circumstances, decrease when changing product design to reach a higher degree of circularity. The mentioned and further standardization activities would be essential to kick the can down the circular economy road and are analyzed and summarized in this study. T2 - PLATE Product Lifetime and the Environment Conference 2023 CY - Espoo, Finland DA - 31.05.2023 KW - Circular Economy KW - Electronics KW - ICT KW - Standardization PY - 2023 SP - 1 EP - 5 AN - OPUS4-57613 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Winkler, Nicolas P. A1 - Johann, Sergej A1 - Kohlhoff, Harald A1 - Neumann, Patrick P. T1 - Revisiting Environmental Sensing Nodes: Lessons Learned and Way Forward N2 - Setting up sensors for the purpose of environmental monitoring should be a matter of days, but often drags over weeks or even months, preventing scientists from doing real research. Additionally, the newly developed hardware and software solutions are often reinventing existing wheels. In this short paper, we revisit the design of our environmental sensing node that has been monitoring industrial areas over a span of two years. We share our findings and lessons learned. Based on this, we outline how a new generation of sensing node(s) can look like. T2 - SMSI 2023 Conference Sensor and Measurement Science International CY - Nuremberg, Germany DA - 08.05.2023 KW - Sensing node KW - Sensor network KW - Environmental monitoring KW - Low-cost KW - LoRaWAN PY - 2023 SN - 978-3-9819376-8-8 DO - https://doi.org/10.5162/SMSI2023/C5.1 SP - 173 EP - 174 PB - AMA Service GmbH CY - Wunstorf AN - OPUS4-57454 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Shaheen, Sabahat A1 - Hicke, Konstantin A1 - Krebber, Katerina T1 - phi-g OTDR utilizing geometric phase N2 - Geometric phase measured per beat period in a ϕ-OTDR based on coherent heterodyne detection is used to measure strain. Proposed method is robust to polarisation mismatch fading as a polarisation mismatch between interfering beams is not a hindrance to the measurement of the geometric phase. The Geometric phase is a function of the intensities of the interfering beams as well as the envelope of the beat signal. Its calculation does not require phase unwrapping and accordingly does not suffer the phase unwrapping errors. It is required to be equated with the traditionally measured phase by applying a scaling factor. The spatial resolution of the measured strain is reduced as it is calculated per beat period. Results are verified using a piezo-electric transducer inline a fiber-under-test. T2 - European Workshop on Optical Fibre Sensors (EWOFS 2023) CY - Mons, Belgium DA - 23.05.23 KW - Coherent Heterodyne KW - Geometric Phase KW - Distributed Fiber Optic Sensor PY - 2023 DO - https://doi.org/10.1117/12.2678295 SP - 1 EP - 5 PB - SPIE AN - OPUS4-57551 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gaal, Mate A1 - Hufschläger, Daniel A1 - Gohlke, Dirk A1 - Weise, Matthias A1 - Ilse, D. A1 - Hillger, W. A1 - Szewieczek, A. T1 - Thermoakustische und Ferroelektret-Wandler als Phased-Array-Sender für luftgekoppelte Ultraschallprüfung N2 - Die üblichen Verfahren der zerstörungsfreien Prüfung mit Ultraschall basieren auf der Verwendung von flüssigen Koppelmitteln. Luftgekoppelte Prüfung setzt sich gegen die konventionellen Verfahren durch, wenn die Flüssigkeit nicht erwünscht oder den Prüfling gar beschädigen kann. Zwei Technologien für Erzeugung von Ultraschallsignalen sind vielversprechend: thermoakustische Wandler und Ferroelektret-Wandler. Basierend auf diesen beiden Technologien wurden Array-Sender gebaut und in diesem Beitrag miteinander verglichen. Thermoakustische Wandler basieren auf Dünnschichttechnologie und bieten eine resonanzfreie Erzeugung von Ultraschall. Sie bestehen aus einer dünnen elektrisch leitenden Schicht und werden mit kurzen elektrischen Pulsen angeregt. Die Erhöhung der thermischen Energie führt zur Erzeugung von akustischen Wellen in der umgebenden Luft. Bei Ferroelektret-Wandlern handelt es sich um polarisierte zelluläre Kunststoffe, die für den Bau eines Array-Senders besonders gut geeignet sind. Einige Ferroelektrete weisen eine hervorragende an Luft angepasste akustische Impedanz auf, so dass auf den Einsatz von Anpassschichten verzichtet werden kann. Ein sehr niedriges mechanisches Übersprechen zwischen einzelnen Elementen ermöglicht eine unabhängige Anregung einzelner Elemente, was bei Piezokompositen deutlich schwieriger wäre. Mit der Phased-Array-Technik können elektronische Fokussierung oder Schwenkung des Einschallwinkels für eine luftgekoppelte Prüfung genutzt werden. Die Schallfelder von diesen beiden Technologien wurden berechnet, gemessen und miteinander verglichen. Die Vorteile und Nachteile der beiden Technologien werden dargestellt. T2 - DAGA 2023 Jahrestagung für Akustik CY - Hamburg, Germany DA - 06.03.2023 KW - Luftgekoppelte Ultraschallprüfung KW - Thermoakustik KW - Ferroelektret KW - Phased Array PY - 2023 UR - https://pub.dega-akustik.de/DAGA_2023 SN - 978-3-939296-21-8 SP - 1594 EP - 1597 AN - OPUS4-57554 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Xu, R. A1 - Hicke, Konstantin A1 - Chruscicki, Sebastian A1 - Marx, S. ED - Curbach, M. ED - Marx, S. ED - Scheerer, S. ED - Hampel, T. T1 - Akustisches SpRK-Monitoring mit SEA und verteilten faseroptischen Sensoren N2 - Im vorliegenden Bericht wurde untersucht, Spanndrahtbrüche in einem Brückenträger sowohl mittels Schallemissionsanalyse (SEA) als auch mit (eingebetteter) verteilter faseroptischer akustischer Sensorik (DAS) zu erkennen. Die Ergebnisse zeigen, dass die Bruchsignale anhand beider Messverfahren detektiert werden können. Die jeweils detektierten Drahtbrüche werden miteinander verglichen. Durch eine Gegenüberstellung werden SEA und DAS detailliert dargestellt. T2 - 12. Symposium "Experimentelle Untersuchungen von Baukonstruktionen" (SEUB) CY - Dresden, Germany DA - 01.06.2023 KW - Verteilte faseroptische akustische Sensorik KW - DAS KW - Brückenmonitoring KW - Spanndrahtbruchdetektion KW - Schallemissionsanalyse KW - SEA PY - 2023 SN - 978-3-86780-740-1 SN - 1613-6934 VL - 67 SP - 136 EP - 147 PB - Technische Universität Dresden - Fakultät Bauingenieurwesen CY - Dresden AN - OPUS4-57581 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nerger, Tino A1 - Neumann, Patrick P. A1 - Weller, Michael G. T1 - Passive Smart Dust a versatile low-cost sensor platform N2 - Coated cellulose particles as colourimetric passive sensors that are detected by the optical camera system of a drone. In this way, hazardous substances, e.g. acids, can be detected from a safe distance in a cost-effective and environmentally friendly way. N2 - Beschichtete Zellulose Partikel als kolorimetrische passive Sensoren, die mittels optische Kamerasystem einer Drohne erfasst werden. Somit können Gefahrenstoffe, in ersten Versuchen zB Säuren aus sicherer Entfernung, kostengünstig und umweltverträglich detektiert werden. T2 - SMSI 2023 Sensor and Measurement Science International CY - Nuremberg, Germany DA - 08.05.2023 KW - Passive Smart Dust KW - Drone KW - Colorimetric sensor particles KW - Remote detection PY - 2023 DO - https://doi.org/10.5162/SMSI2023/C5.3 SP - 1 EP - 2 AN - OPUS4-57527 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Plarre, Rüdiger A1 - Busweiler, Sabine A1 - Haustein, V. A1 - von Laar, C. A1 - Haustein, T. T1 - Eignung von Korynetes caeruleus (Coleoptera: Cleridae) zur biologischen Bekämpfung von Anobium punctatum (Coleoptera, Ptinidae) N2 - Larven und adulte Käfer von Korynetes caeruleus (DE GEER 1775) (Coleoptera: Cleridae) wurden in alten Kirchen gesammelt und im Labor auf Kulturen von Anobium punctatum (DE GEER 1774) (Coleoptera, Ptinidae, früher Anobiidae) aufgezogen. Der Bruterfolg von K. caeruleus war gering, aber es wurden grundlegende Parameter des Entwicklungszyklus dieser Art ermittelt. Bei 21 °C und 75 % relativer Luftfeuchtigkeit und einer viermonatigen Kälteperiode bei 4 °C dauerte die Entwicklung von K. caeruleus vom Ei bis zum erwachsenen Tier 2 Jahre. Das Puppenstadium kann nach eineinhalb Jahren erreicht und abgeschlossen werden. Die Larven von K. caeruleus ernährten sich von den Larven von A. punctatum. Die Nahrungsaufnahme ist eine Kombination aus Saugen von Hämolymphe und Verzehr von Körperteilen. Die sichelartigen Mandibeln der Larven von K. caeruleus durchdringen die Cuticula der Beutetierlarven, gefolgt von pumpenden und saugenden Körperbewegungen. Erwachsene Käfer von A. punctatum wurden von K. caeruleus-Larven nicht angegriffen. Das Fressverhalten von erwachsenen K. caeruleus wurde nicht untersucht. T2 - EIPOS Sachverständigentage CY - Dresden, Germany DA - 29.06.2023 KW - Anobium punctatum KW - Biologische Schädlingsbekämpfung KW - Holzschutz KW - Kulturguterhaltung KW - Korynetes caeruleus PY - 2023 SN - 976-3-7388-0827-8 SP - 99 EP - 115 PB - Faunhofer IRB Verlag CY - Stuttgart AN - OPUS4-57891 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Liao, Chun-Man A1 - Petryna, Y. T1 - Damage Assessment of Civil Structures Using Wave Propagation Analysis and Transmissibility Functions N2 - A common damage detection method in civil engineering is to monitor dynamic characteristics such as natural frequencies and modal shapes, which are directly related to the structural stiffness. However, the discrepancy in measured natural frequencies may result from environmental changes, the soil-structure interaction or effects caused by earthquakes. This makes it difficult to decide whether the local change in structural properties is caused by damage or other factors. To address this challenge and thus improve the current damage detection method, the wave propagation analysis method and the transmissibility relationship were considered. In our study, the wave propagation field in structures was reconstructed by applying the Normalized-Input-Output-Minimization (NIOM) method to vibration recordings. Wave velocities and transmissibility functions were considered as reference values for the damage indicators. This paper demonstrates the evaluation of local property changes in two examples of large-scale structures: a 14-story RC building and a 64 m long pedestrian bridge. The proposed damage indicators show a clear correspondence to structural changes. T2 - EVACES2021 9th International Conference on Experimental Vibration Analysis for Civil Engineering Structures CY - Online meeting DA - 14.09.2021 KW - Damage detection KW - Damage indices KW - Normalized-Input-Output-Minimization KW - Transmissibility function KW - Wave propagation PY - 2022 SN - 978-3-030-93235-0 SN - 978-3-030-93236-7 DO - https://doi.org/10.1007/978-3-030-93236-7_2 SP - 3 EP - 13 PB - Springer CY - Cham AN - OPUS4-55565 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Heßmann, Jennifer A1 - Hilgenberg, Kai ED - Hausmann, J. M. T1 - Meeting the challenge of thermal joining of steel and aluminum using a new approach based on melt displacement by electromagnetic forces N2 - Environmental protection, resource conservation and CO2 reduction require new joining concepts for effective multi-material design in automotive lightweight construction. The thermal joining of dissimilar materials, especially the combination of aluminum alloys and steel, is associated with difficulties. Different material properties, such as melting point and coefficient of thermal expansion, complicate joining processes. Furthermore, the insolubility between these materials results in the formation of intermetallic phases. These brittle phases reduce the load-bearing capacity and quality of the joints. The thickness of the intermetallic phases should not reach the critical value of 10 μm to ensure good mechanical properties of the joint. It is known that a two-phase reaction layer consisting of Al5Fe2 and Al3Fe (also known as Al13Fe4) forms at the interface between solid steel and liquid aluminum. Due to high cooling rates, as it is the case in laser beam welding, metastable intermetallic compounds can form different from the equilibrium state. The formation of the intermetallic reaction layer is a diffusion-controlled process. So, it is only possible to control the growth of these phases. This problem has led to use joining methods that do not require the melting of both joining partners. A promising joining method is laser beam welding-brazing, whereby only one joining partner is melted and wets the solid joining partner. Conventional laser beam welding-brazing only results in material-fit joints and often requires the use of expensive filler materials. An additional form-fit could optimize the mechanical performance of the joint. For this reason, a new joining method for overlap configurations of dissimilar materials was developed. A laser beam melts the lower joining partner through a cavity of the upper joining partner. The created melt pool is moved upwards into the cavity of the upper joining partner due to contactless induced Lorentz forces of an AC-magnetic system. The displaced melt creates a form- and material-fit joint after solidification. The advantage of this joining technology is the absence of filler materials, flux agents and expensive auxiliary joining elements. T2 - 5th International Conference Hybrid 2022 - Materials and Structures CY - Leoben, Austria DA - 20.07.2022 KW - Joining dissimilar materials KW - Laser beam welding KW - Electromagnetic forces KW - Steel and aluminium PY - 2022 SN - 978-3-88355-426-6 SP - 6 EP - 8 PB - Deutsche Gesellschaft für Materialkunde (DGM) CY - Sankt Augustin AN - OPUS4-55536 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -