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9. Effect of isothermal transformation temperature on the microstructure, precipitation behavior, and mechanical properties of anti-seismic rebar

Author

Zhang Junxiang, Gu Shangjun, Wang Jie, Wei Fulong, Li Zhiying, Zeng Zeyun, Shen Bin, and Li Changrong

Subjects
nb/ti strengthening, screw dislocation, diffusion coefficient, strengthening mechanism, Technology, Chemical technology, TP1-1185, Chemicals: Manufacture, use, etc., TP200-248
Abstract

The synergy between Nb/Ti strengthening and precise isothermal transformation temperatures has resulted in the optimal microstructure and mechanical properties in Nb/Ti anti-seismic rebars. The microstructure, precipitates, and mechanical properties of experimental steels at different isothermal transformation temperatures were characterized using scanning electron microscopy, transmission electron microscopy, electron backscatter diffraction, and universal tensile testing machine. As the isothermal transformation temperature decreased from 700 to 600°C, the ferrite grain size, pearlite interlamellar spacing, and carbon diffusion coefficient of the experimental steel decreased to 6.69 μm, 0.17 μm, and 0.14 cm2·s−1, respectively, while the yield strength and tensile strength increased to 584 and 714 MPa, respectively. At 600°C, the pearlite transformation rate in the experimental steel was the fastest, accompanied by the most rapid precipitation kinetics. The precipitates were (Nb, Ti)C of approximately 50 nm in size, with a mismatch of 14.24% at the matrix/precipitate interface and a screw dislocation angle of 2.07°. The presence of screw dislocation steps may facilitate nucleation of Nb/Ti precipitates, forming semi-coherent interfaces.

Published
2024
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21. Development and testing of ATLAS ITk strip barrel stave components

Author

Li, Zhiying and Weidberg, Anthony

Subjects
Particle beams, Colliding
Abstract

The LHC is planned to be upgraded to HL-LHC with a nominal luminosity of 5 × 10^34 cm^−2s^−1 and an operational lifetime of over 10 years. The ATLAS (A Toroidal LHC ApparatuS) experiment, as a general purpose particle physics experiment at the LHC, is planning a major upgrade in its tracker part to ensure performance in higher radiation and data rate. The new all-silicon inner tracker (ITk) is planned to be replacing the current SCT during the long shut down in 2026. This thesis is focused on the strip barrel part of the ITk. It discusses the performance testing of different components on a strip barrel stave and the overall performance studies of a single stave. Pre-irradiation effect and operational parameters of ABCStar chip set are tested. The performance of a prototype ABCStar module in test beam is studied. This thesis discusses the software and procedure developments of the tape tester robot, which is developed for measuring strip barrel bus tapes. The statistical analysis of pre-production tape test results is obtained. The reliability studies of VTRx+ optical transceivers are also presented. This thesis also includes various studies on the performance of a single barrel stave.

Published
2022

27. Effect of cooling rate and Nb synergistic strengthening on microstructure and mechanical properties of high-strength rebar

Author

Jiang Yafei, Gu Shangjun, Wang Jie, Wei Fulong, Li Zhiying, Li Changrong, Wang Tianyou, and Zeng Zeyun

Subjects
cooling rate, nb, high-strength rebar, microstructure, precipitation behavior, mechanical properties, Technology, Chemical technology, TP1-1185, Chemicals: Manufacture, use, etc., TP200-248
Abstract

Rebar is an extremely important building material. The cooling rate and the presence of niobium (Nb) element are key factors influencing the overall performance of rebars. In this work, the high-strength rebar’s microstructure, precipitated phase, and mechanical properties were characterized using scanning electron microscopy, transmission electron microscopy, HVS-1000 hardness tester, and MTS810 universal tensile testing machine. The results showed that a shift in cooling rate from 0.3 to 3°C·s−1 resulted in noticeable changes in the microstructures of rebars, particularly between Nb-free and Nb-containing variants. In the case of Nb-containing rebars, there was an increase of 8.26% in the proportion of pearlite, along with a decrease of 10.63 μm in the average grain size of ferrite. Furthermore, the lamellar spacing of pearlite experienced a decrease of 0.0495 μm, the proportion of low-angle grain boundaries saw an increment of 4.13%, and the size of the precipitated phase (Nb, Ti, V) C reduced by 18.9 nm. These changes collectively led to a significant increase in hardness (98.56 HV), yield strength (179.02 MPa), and ultimate strength (199.43 MPa). The resultant fracture morphology manifested as a dimple pattern.

Published
2024
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28. BiQCap: A Biquaternion and Capsule Network-Based Embedding Model for Temporal Knowledge Graph Completion

Author

Zhang, Sensen, Liang, Xun, Li, Zhiying, Feng, Junlan, Zheng, Xiangping, Wu, Bo, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Wang, Xin, editor, Sapino, Maria Luisa, editor, Han, Wook-Shin, editor, El Abbadi, Amr, editor, Dobbie, Gill, editor, Feng, Zhiyong, editor, Shao, Yingxiao, editor, and Yin, Hongzhi, editor

Published
2023
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37. The ABC130 barrel module prototyping programme for the ATLAS strip tracker

Author

Poley, Luise, Sawyer, Craig, Addepalli, Sagar, Affolder, Anthony, Allongue, Bruno, Allport, Phil, Anderssen, Eric, Anghinolfi, Francis, Arguin, Jean-François, Arling, Jan-Hendrik, Arnaez, Olivier, Asbah, Nedaa Alexandra, Ashby, Joe, Asimakopoulou, Eleni Myrto, Atlay, Naim Bora, Bartsch, Ludwig, Basso, Matthew J., Beacham, James, Beaupré, Scott L., Beck, Graham, Beichert, Carl, Bergsten, Laura, Bernabeu, Jose, Bhattarai, Prajita, Bloch, Ingo, Blue, Andrew, Bochenek, Michal, Botte, James, Boynton, Liam, Brenner, Richard, Brueers, Ben, Buchanan, Emma, Bullard, Brendon, Capocasa, Francesca, Carr, Isabel, Carra, Sonia, Chao, Chen Wen, Chen, Jiayi, Chen, Liejian, Chen, Yebo, Chen, Xin, Cindro, Vladimir, Ciocio, Alessandra, Civera, Jose V., Cormier, Kyle, Cornell, Ella, Crick, Ben, Dabrowski, Wladyslaw, Dam, Mogens, David, Claire, Demontigny, Gabriel, Dette, Karola, DeWitt, Joel, Diez, Sergio, Doherty, Fred, Dopke, Jens, Dressnandt, Nandor, Edwards, Sam, Fadeyev, Vitaliy, Farrington, Sinead, Fawcett, William, Fernandez-Tejero, Javier, Filmer, Emily, Fleta, Celeste, Gallop, Bruce, Galloway, Zachary, Argos, Carlos Garcia, Garg, Diksha, Gignac, Matthew, Gillberg, Dag, Giovinazzo, Dena, Glover, James, Goettlicher, Peter, Gonella, Laura, Gorišek, Andrej, Grant, Charles, Grant, Fiona, Gray, Calum, Greenall, Ashley, Gregor, Ingrid-Maria, Greig, Graham, Grillo, Alexander A., Gu, Shan, Guescini, Francesco, da Costa, Joao Barreiro Guimaraes, Gunnell, Jane, Gupta, Ruchi, Haber, Carl, Halgeri, Amogh, Hamersly, Derek, Haugen, Tom-Erik, Hauser, Marc, Heim, Sarah, Heim, Timon, Helling, Cole, Herde, Hannah, Hessey, Nigel P., Hommels, Bart, Hönig, Jan Cedric, Hunter, Amelia, Jackson, Paul, Jewkes, Keith, John, Jaya John, Johnson, Thomas Allan, Jones, Tim, Kachiguin, Serguei, Kang, Nathan, Kaplon, Jan, Kareem, Mohammad, Keener, Paul, Keller, John, Key-Charriere, Michelle, Kilani, Samer, Kisliuk, Dylan, Klein, Christoph Thomas, Koffas, Thomas, Kramberger, Gregor, Krizka, Karol, Kroll, Jiri, Kuehn, Susanne, Kurth, Matthew, Labitan, Charilou, Lacasta, Carlos, Lacker, Heiko, Leitao, Pedro Vicente, León, Pablo, Li, Boyang, Li, Chenyang, Li, Yiming, Li, Zhiying, Liang, Zhijun, Liberatore, Marianna, Lister, Alison, Liu, Kai, Liu, Peilian, Lohse, Thomas, Lönker, Jonas, Lou, Xinchou, Lu, Weiguo, Luce, Zachary, Lynn, David, MacFadyen, Ross, Mägdefessel, Sven, Mahboubi, Kambiz, Malik, Usha, Mandić, Igor, La Marra, Daniel, Martin, Jean-Pierre, Martinez-Mckinney, Forest, Mikestikova, Marcela, Mikuž, Marko, Mitra, Ankush, Mladina, Evan, Montalbano, Alyssa, Monzat, David, Morii, Masahiro, Mullier, Geoffrey, Neundorf, Jonas, Newcomer, Mitch, Ng, Yanwing, Nikolica, Adrian, Nikolopoulos, Konstantinos, Oechsle, Jan, Oliver, Jason, Orr, Robert S., Ottino, Gregory, Paillard, Christian, Pani, Priscilla, Paowell, Sam, Parzefall, Ulrich, Phillips, Peter W., Platero, Adrián, Platero, Vicente, Prahl, Volker, Pyatt, Simon, Ran, Kunlin, Reardon, Nikita, Rehnisch, Laura, Renardi, Alessia, Renzmann, Martin, Rifki, Othmane, Rodriguez, Arturo Rodriguez, Rosin, Guy, Rossi, Edoardo, Ruggeri, Tristan, Rühr, Frederik, Rymaszewski, Piotr, Sadrozinski, Hartmut F. -W., Sanethavong, Phathakone, Santpur, Sai Neha, Scharf, Christian, Schillaci, Zach, Schmitt, Stefan, Sharma, Abhishek, Sciolla, Gabriella, Seiden, Abraham, Shi, Xin, Simpson-Allsop, Cameron, Snoek, Hella, Snow, Steve, Solaz, Carles, Soldevila, Urmila, Sousa, Filipe, Sperlich, Dennis, Staats, Ezekiel, Stack, Tynan Louis, Stanitzki, Marcel, Starinsky, Nikolai, Steentoft, Jonas, Stegler, Martin, Stelzer, Bernd, Stucci, Stefania, Swientek, Krzysztof, Taylor, Geoffrey N., Taylor, Wendy, Teoh, Jia Jian, Teuscher, Richard, Thomas, Jürgen, Tigchelaar, Allen, Tran, Tony, Tricoli, Alessandro, Trischuk, Dominique Anderson, Unno, Yoshinobu, van Nieuwenhuizen, Gerrit, Ullán, Miguel, Vermeulen, Jos, Vickey, Trevor, Vidal, Guillem, Vreeswijk, Marcel, Warren, Matt, Weidberg, Tony, Wiehe, Moritz, Wiglesworth, Craig, Wiik-Fuchs, Liv, Williams, Scott, Wilson, John, Witharm, Rhonda, Wizemann, Felix, Wonsak, Sven, Worm, Steve, Wormald, Mike, Xella, Stefania, Yang, Yuzhen, Yarwick, Joseph, Yu, Tang-Fai, Zhang, Dengfeng, Zhang, Kaili, Zhou, Maosen, and Zhu, Hongbo

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

For the Phase-II Upgrade of the ATLAS Detector, its Inner Detector, consisting of silicon pixel, silicon strip and transition radiation sub-detectors, will be replaced with an all new 100 % silicon tracker, composed of a pixel tracker at inner radii and a strip tracker at outer radii. The future ATLAS strip tracker will include 11,000 silicon sensor modules in the central region (barrel) and 7,000 modules in the forward region (end-caps), which are foreseen to be constructed over a period of 3.5 years. The construction of each module consists of a series of assembly and quality control steps, which were engineered to be identical for all production sites. In order to develop the tooling and procedures for assembly and testing of these modules, two series of major prototyping programs were conducted: an early program using readout chips designed using a 250 nm fabrication process (ABCN-25) and a subsequent program using a follow-up chip set made using 130 nm processing (ABC130 and HCC130 chips). This second generation of readout chips was used for an extensive prototyping program that produced around 100 barrel-type modules and contributed significantly to the development of the final module layout. This paper gives an overview of the components used in ABC130 barrel modules, their assembly procedure and findings resulting from their tests., Comment: 82 pages, 66 figures

Published
2020
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46. Advances in Understanding of the Interaction between Anthocyanins and Proteins

Author

ZANG Zhihuan, CHOU Shurui, TANG Siyi, LI Zhiying, TIAN Jinlong, LI Bin

Subjects
anthocyanins, proteins, stability, functional properties, interaction, Food processing and manufacture, TP368-456
Abstract

As functional bioactive substances, anthocyanins have attracted more and more attention, but their application is limited by their poor stability and low bioavailability. As one of the three essential nutrients needed by the human body, protein has good biocompatibility and biodegradability. It is often used in food processing, but its functional properties need to be improved. Proteins and anthocyanins usually coexist in food, and can easily interact with each other both covalently and non-covalently. The non-covalent interactions are predominant, including hydrogen bonds, hydrophobic interaction, electrostatic interaction and van der Waals force. This paper summarizes recent progress in the research on the interaction between anthocyanins and proteins, including the effect of proteins on anthocyanin stability and bioavailability, the effect of anthocyanins on protein functional properties, and the application status of anthocyanin-protein complexes, which will provide a theoretical basis for the application of anthocyanins and proteins in food deep processing.

Published
2023
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