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1
المؤلفون: Becerra Garcia, Marley, 1979, Nilsson, Janne, Franke, Steffen, Breitkopf, Cornelia, Andre, Pascal
المصدر: Journal of Physics D. 57(1)
مصطلحات موضوعية: arc plasmas, optical emission spectroscopy, plasma diagnostics
الوصف: Plasma diagnostics is a key tool to support the further development of plasma-induced chemical conversion of greenhouse gases (such as CO2) into high-value chemicals. For this reason, spectroscopic and electric measurements of low current (below 1.7 A), stationary arc plasmas in CO2 at atmospheric pressure with addition of N-2 or H2O are reported. High-speed photography, imaging emission spectroscopy and time-resolved electrical measurements are used to obtain time-space resolved gas temperatures as well as the electric-field current characteristics of the discharge. It is found that the lowest average electric field in a CO2 arc plasma at atmospheric pressure is similar to 20 kV mm(-1) at a current between 0.8 and 1 A. If the current decreases below this level, the arc remains in vibrational-translational (VT) equilibrium by increasing the electric field. However, VT equilibrium conditions can be only maintained until a threshold minimum current of 0.33 +/- 0.05 A, at which the arc transitions into a non-equilibrium condition with further increasing electric fields (reaching 68 +/- 15 V mm(-1) at 0.03 A). The addition of N-2 or H2O did not influence the electrical characteristics of the CO2 arc within to the tested mixtures. However, there is only a significant decrease in the electric field of the formed transition arcs and the threshold minimum current in the presence of N-2. The spectra of the low-current CO2 arc is found to be dominated by emission from the C-2 Swan band system and the O I 777 nm triplet peak. However, the CN band dominates the spectra even when small amounts (0.5 wt%) of N-2 is present in the plasma. The gas temperature at the axis of the CO2 arc plasma decreased slightly with decreasing current, from an estimated 7000 K at 1 A down to 6300 K at 0.4 A. The thermal radius of the arc is estimated to be larger than 1.2 mm, more than two times larger than the optical radius obtained from the emitted radiation. The addition of N-2 and H2O (up to 7 and 9 wt% respectively) lead to only to a 500 K decrease in the axial arc temperature.
وصف الملف: print
الوصول الحر: https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-339334Test
https://doi.org/10.1088/1361-6463/acfcc6Test -
2
المؤلفون: Fink, Gerhard, Jockwer, Robert, 1984, Šušteršič, Iztok, Stepinac, Mislav, Palma, Pedro, Bedon, Chiara, Casagrande, Daniele, Franke, Steffen, D’Arenzo, Giuseppe, Brandon, Daniel, Viau, Christian
المصدر: 13th World Conference on Timber Engineering: Timber for a Livable Future, WCTE 2023, Oslo, Norway 13th World Conference on Timber Engineering, WCTE 2023. 2:1001-1008
مصطلحات موضوعية: deformation and vibrations, COST, multi-storey timber, sustainability, fire, robustness, durability, tall timber buildings, holistic design, design for adaptability and reuse, seismic design
الوصف: With the worldwide construction sector being responsible for one third of carbon dioxide emissions, as well as forty percent of the world’s energy use and waste production, a shift to sustainable and renewable construction techniques is crucial. Engineered timber, a champion of sustainable construction materials, has evolved to a stage that enables the construction of not only family housing but also taller buildings so far commonly built from concrete or steel. Designing taller timber buildings made is more demanding than their concrete and steel counterparts. Whereas different design aspects (architectural, structural, fire safety, acoustics, etc.) of concrete buildings can work almost independently, the design of taller timber buildings should be performed with intensive collaboration among the design teams. It is therefore crucial to address taller multi-storey timber buildings from a collaborative and interdisciplinary perspective, considering static, dynamic, fire, acoustic, human health, and other aspects in parallel and not in isolation. Only through interdisciplinary analysis and interaction can a set of holistic design guidelines be developed that will enable the safe construction of taller timber buildings, as well as respect human wellbeing demands. In this paper, the COST Action CA20139 will be presented and the main aims will be discussed.
وصف الملف: electronic
الوصول الحر: https://research.chalmers.se/publication/537937Test
https://research.chalmers.se/publication/537937/file/537937_Fulltext.pdfTest -
3دورية أكاديمية
المؤلفون: Lins, Dio, Franke, Steffen
المصدر: Journal of Sustainable Architecture and Civil Engineering; Vol. 34 No. 1 (2024); 113-122 ; 2335-2000 ; 2029-9990
مصطلحات موضوعية: cross-laminated timber, CLT, flat slabs, end-grain bonded timber, on-site application, temperature effect
الوصف: The end-grain bonding of timber components using the Timber Structures 3.0 technology (TS3) is an advancing construction method in timber engineering. This technology allows the realisation of any plate size by bonding plates on-site where low temperatures influence the performance. Therefore, investigations are underway to evaluate the influence of the low temperatures on the curing process. Additionally, research is in progress to discover techniques to reduce any adverse effects of low curing temperatures on the mechanical properties of the bond. The implementation of particular measures, such as the inclusion of milled heating wires into the joint and the pre-heating of the joint with a hot air blower, has been identified as advancing the potential for grouting even in the face of low external temperatures, as recent research has indicated.
وصف الملف: application/pdf
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4تقرير
المؤلفون: Franke, Steffen, Methling, Ralf, Uhrlandt, Dirk, Gortschakow, Sergey, Reichert, Frank, Petchanka, Arkadz
مصطلحات موضوعية: Physics - Plasma Physics
الوصف: A switching-off process very similar to those in real high-voltage self-blast circuit-breakers is emulated in a model chamber to study the arc properties by optical emission spectroscopy. The arc is operated in a chamber filled with SF$_6$ between a pin-tulip contact system enclosed by a PTFE nozzle. Transparent windows in the chamber wall and a slit in the nozzle enable an optical investigation of the arc cross section less than one millisecond before current zero. The side-on radiance of a fluorine atom lines has been measured with an imaging spectroscopic system. Considering rotational symmetry of the arc the corresponding radial emission coefficients have been determined by Abel inversion. The radial temperature profiles are calculated from the emission coefficients including pressure measurements and the corresponding plasma composition. In contrast to previous studies, a specific iterative approach is proposed to consider the optical thickness of the plasma. A maximum optical thickness between 0.2 and 0.4 has been observed. Temperature profiles corrected for absorption effects show increasing maximum temperature in the arc axis with decreasing current towards current zero. The effect of the plasma composition on absolute arc temperatures is discussed. The temperature profiles can be used to validate CFD simulations of the switching-off process in the model chamber.
Comment: 17 pages, 7 figures, 3 tablesالوصول الحر: http://arxiv.org/abs/2003.02514Test
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5تقرير
المصدر: Sci Data 7, 439 (2020)
مصطلحات موضوعية: Physics - Plasma Physics
الوصف: A metadata schema, named Plasma-MDS, is introduced to support research data management in plasma science. Plasma-MDS is suitable to facilitate the publication of research data following the FAIR principles in domain-specific repositories and with this the reuse of research data for data driven plasma science. In accordance with common features in plasma science and technology, the metadata schema bases on the concept to separately describe the source generating the plasma, the medium in which the plasma is operated in, the target the plasma is acting on, and the diagnostics used for investigation of the process under consideration. These four basic schema elements are supplemented by a schema element with various attributes for description of the resources, i.e. the digital data obtained by the applied diagnostic procedures. The metadata schema is first applied for the annotation of datasets published in INPTDAT -- the interdisciplinary data platform for plasma technology.
Comment: 15 pages, 1 figure, 10 tablesالوصول الحر: http://arxiv.org/abs/1907.07744Test
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6مؤتمر
المؤلفون: Adamus, Wojciech, Addo, Albert, Alvarez-Rodriguez, Alberto, Amez, Isabel, Amyotte, Paul, Arnhold, Thorsten, Arntzen, Bjørn, Askar, Enis, Barbu, Bogdan, Barozzi, Marco, Bauwens, Regis, Bendada, Samah, Benke, Alexander, Berger, Frank, Berghmans, Jan, Bernard, Stephane, Beyer, Michael, Boeck, Lorenz, Brunzendorf, Jens, Bu, Yajie, Buchner, Christoph, Castells, Blanca, Chang, Pojul, Chen, Tengfei, Chunmiao, Yuan, Cloney, Chris, Conzen, Jens, Copelli, Sabrina, Danzi, Enrico, Dastidar, Ashok, Daubech, Jérôme, Degrève, Jan, Derudi, Marco, D'Hyon, Sebastian, Di Benedetto, Almerinda, Dobashi, Ritsu, Dorofeev, Sergey, Dueñas Santana, Julio Ariel, Dufaud, Olivier, Dufour, Anthony, Dworschak, Rene, Dyduch, Zdzisław, Dymke, Jessica, Dyrba, Patrick, Eckart, Sven, Egan, Simon, El Gadha, Chayma, El-Zahlanieh, Stephanie, Endo, Takuma, Engelmann, Frank, Essmann, Stefan, Franchini, Fausto, Franke, Steffen, Gabel, Dieter, Gambaruto, Alberto, Garcia-Torrent, Javier, Geoerg, Paul, Gerlach, Johanna, Glaude, Pierre-Alexandre, Glor, Martin, González Gómez, Orelvis, Grosshans, Holger, Guo, Yongzheng, Habib, Abdel Karim, Hébrard, Jérôme, Hecht, Kristin, Heer, Christian, Heilmann, Vanessa, Herbst, Sabrina, Hesener, Ute, Hilbert, Michael, Hisken, Helene, Huang, Chen, Huang, Weixing, Jankůj, Vojtěch, Jantac, Simon, Jean, Amelie, Johzaki, Tomoyuki, Kanbur, Harun, Kapahi, Anil Kapahi, Khan, Faisal, Kim, Wookyung, Kim, Yangkyun, Kleinert, Jan, Kluge, Martin, Koch, Florian, Kraft, Stefan, Krause, Harmut, Krause, Tim, Krause, Ulrich, Krietsch, Arne, Lakshmipathy, Sunil, Lecocq, Guillaume, León, David, Leprette, Emmanuel, Lindner-Silwester, Tino, Lucas, Melodía, Maas, Ulrich, Manchikatla, Manideep, Mao, Gongping, Mao, Huan, Markus, Detlev, Marmo, Luca, Martin, Conor, McCarthy-Singh, Bisham, Medic, Ljiljana, Meistes, Jörg, Mejía-Botero, Cristian, Melguizo-Gavilanes, Josué, Meyer, Georg, Mitu, Maria, Mogi, Toshio, Mynarz, Miroslav, Norman, Frederik, Orozco, Jesus Luis, Padron Herrera, Victor Hugo, Pan, Yangyue, Pietraccini, Matteo, Pirker, Stefan, Portarapillo, Maria, Proust, Christophe, Puttinger, Stefan, Raupenstrauch, Harald, Ren, Kaiyue, Salzano, Ernesto, Sanchirico, Roberto, Schießl, Robert, Schneiderbauer, Simon, Schüler, Niklas, Scotton, Martina Silvia, Shepherd, Joseph, Shu, Bo, Siegle, Leo, Skjold, Trygve, Skrinsky, Jan, Spijker, Christoph, Spitzer, Stefan, Springer, Niels, Stolpe, Frank, Stolz, Thomas, Tanaka, Keita, Taveau, Jerome, Thurnherr, Peter, Toman, Adrian, Trofa, Marco, Uber, Carsten, Ueda, Akihiro, Uhrland, Dirk, Valera-Medina, Agustin, Van Caneghem, Jo, van Wingerden, Kees, Vanierschot, Maarten, Veiga-López, Fernando, Verplaetsen, Filip, Vignes, Alexis, Walch, Otto, Wandt, Joachim, Wang, Jian, Wei, Aizhu, William Louis, Mame, Wu, Dejian, Xu, Wenchao, Xu, Zhijian, Yu, Chunkan, Zakel, Sabine, Zhao, Peng, Zhong, Shengjun
المساهمون: Physikalisch-Technische Bundesanstalt (PTB)
مصطلحات موضوعية: Explosions, Explosion Protection, Process Safety, Industrial Loss Prevention, Gas Dynamics
الوصف: It is our pleasure to present the proceedings of the 14th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (ISHPMIE). Despite the ongoing global challenges, we are happy to compile proceedings consisting of 60 high-quality papers that reflect the scientific state-of-the-art in the following topical categories: Advances in explosion protection: Strategies, measures, and protective equipment; Explosion modelling and simulation; Explosion testing; Hydrogen safety; Explosion prevention; Dust explosions; Explosion-protected devices; Hybrid mixture explosions; Flame propagation and acceleration; Ignition phenomena. All articles in this volume have been subject to a peer-review process administered by the Proceeding Editors. We are thankful to the 70 expert referees who guaranteed the professional and scientific standards expected of ISHPMIE.
وصف الملف: application/pdf
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7مؤتمر
المؤلفون: Franke, Steffen, Franke, Bettina
المصدر: Franke, Steffen; Franke, Bettina (10 May 2023). Berücksichtigung des klimatischen Einflusses auf mechanische Verstärkungen In: S-Win Von der Forschung zur Praxis. Biel. 10. Mai 2023.
مصطلحات موضوعية: T Technology (General), TA Engineering (General). Civil engineering (General), TH Building construction
الوصف: Die aktuellen Entwicklungen im Holzbau werden mit imposanten und leistungsfähigen Objekten, Projekten und Strukturen weltweit beschrieben. Die Leistungsfähigkeit von Holztragelementen kann durch mechanische Verstärkungen, z. B. in Form von eingeklebten Stäben, selbstbohrenden Vollgewindeschrauben oder Gewindestangen, partiell noch erhöht werden. Verstärkungen von Verbindungen oder Tragelementen werden im Holzbau notwendig, wenn die Querschnittsgeometrie eingeschränkt ist oder wenn z. B. gebogene, gekerbte oder durchbrochene Bauteile verwendet werden. Die Wirkungsweise wie auch das statische Trag- und Versagensverhalten von Verstärkungen ist u. a. in Blass et al. (2006, 2010, 2017), Dietsch (2012, 2017) und Trautz & Koj (2008) gezeigt. Zusätzlich zu den statischen Beanspruchungen ergeben sich auch klimatische Beanspruchung aufgrund der Hygroskopie des Holzes und des variierenden Umgebungsklima übers Jahr.
وصف الملف: application/pdf
العلاقة: https://arbor.bfh.ch/20643Test/; Franke, Steffen; Franke, Bettina (10 May 2023). Berücksichtigung des klimatischen Einflusses auf mechanische Verstärkungen In: S-Win Von der Forschung zur Praxis. Biel. 10. Mai 2023.
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8دورية أكاديمية
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9دورية أكاديمية
المساهمون: Swedish strategic research program StandUp for Energy
المصدر: Journal of Physics D: Applied Physics ; volume 57, issue 1, page 015202 ; ISSN 0022-3727 1361-6463
الوصف: Plasma diagnostics is a key tool to support the further development of plasma-induced chemical conversion of greenhouse gases (such as CO 2 ) into high-value chemicals. For this reason, spectroscopic and electric measurements of low current (below 1.7 A), stationary arc plasmas in CO 2 at atmospheric pressure with addition of N 2 or H 2 O are reported. High-speed photography, imaging emission spectroscopy and time-resolved electrical measurements are used to obtain time-space resolved gas temperatures as well as the electric-field current characteristics of the discharge. It is found that the lowest average electric field in a CO 2 arc plasma at atmospheric pressure is ∼20 kV mm −1 at a current between 0.8 and 1 A. If the current decreases below this level, the arc remains in vibrational–translational (VT) equilibrium by increasing the electric field. However, VT equilibrium conditions can be only maintained until a threshold minimum current of 0.33 ± 0.05 A, at which the arc transitions into a non-equilibrium condition with further increasing electric fields (reaching 68 ± 15 V mm −1 at 0.03 A). The addition of N 2 or H 2 O did not influence the electrical characteristics of the CO 2 arc within to the tested mixtures. However, there is only a significant decrease in the electric field of the formed transition arcs and the threshold minimum current in the presence of N 2 . The spectra of the low-current CO 2 arc is found to be dominated by emission from the C 2 Swan band system and the O I 777 nm triplet peak. However, the CN band dominates the spectra even when small amounts (0.5 wt%) of N 2 is present in the plasma. The gas temperature at the axis of the CO 2 arc plasma decreased slightly with decreasing current, from an estimated 7000 K at 1 A down to 6300 K at 0.4 A. The thermal radius of the arc is estimated to be larger than 1.2 mm, more than two times larger than the optical radius obtained from the emitted radiation. The addition of N 2 and H 2 O (up to 7 and 9 wt% respectively) lead to only to ...
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10مؤتمر
المؤلفون: Franke, Bettina, Schiere, Marcus, Franke, Steffen
المصدر: Franke, Bettina; Schiere, Marcus; Franke, Steffen (12 May 2022). Climate and moisture induced stresses in block-glued glulam members of timber bridges In: 4th International Conference on Timber Bridges (ICTB 2021PLUS): Conference Proceedings (pp. 1-8). Berner Fachhochschule, AHB 10.24451/hqdc-wp58
مصطلحات موضوعية: T Technology (General), TA Engineering (General). Civil engineering (General), TG Bridge engineering, TH Building construction
الوصف: perature and leads to moisture content (MC) variations across the cross section. The MC affects the physical and mechanical properties as well as the dimensions due to shrinkage and swelling below the fibre satura-tion point (FSP). Due to constrained volumetric strains, e.g. due to swelling and shrinkage, changes in moisture content impose moisture induced stresses (MIS) which, if exceeding the tensile strength perpen-dicular to the grain of the material, can cause fractures such as cracks or delaminations. Thus, the correct estimation of the MC is important for the design, quality assurance, and durability of timber bridges. There was the question especially for large glulam members as produced by block-gluing about the impact of ambient climate variations on the moisture induced stresses and possible failure. Block glulam beams form wide cross-sections by gluing single glulam beams to each other. They are used as, e.g., main struc-tural elements for timber bridges, see Figure 1. Therefore, cross sections of practical dimensions were clas-sified regarding the assumed ambient climate in service by numerical simulations that showed the moisture content and gradient over the cross section. Finally, the moisture induced mechanical response was simu-lated using a coupled moisture diffusion and mechanical model. The results were summarized to a practical advice for the dimensioning.
وصف الملف: application/pdf
العلاقة: https://arbor.bfh.ch/18485Test/; Franke, Bettina; Schiere, Marcus; Franke, Steffen (12 May 2022). Climate and moisture induced stresses in block-glued glulam members of timber bridges In: 4th International Conference on Timber Bridges (ICTB 2021PLUS): Conference Proceedings (pp. 1-8). Berner Fachhochschule, AHB 10.24451/hqdc-wp58
الإتاحة: https://doi.org/10.24451/hqdc-wp58Test
https://arbor.bfh.ch/18485/1Test/Franke%20Schiere%20Franke%202022%20ICTB2021%20Block%20glued%20glulam.pdf
https://arbor.bfh.ch/18485Test/
https://www.bfh.ch/en/news/events/ictb-2021Test/
