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Brazing of WC–8Co cemented carbide to steel using Cu–Ni–Al alloys as filler metal: Microstructures and joint mechanical behavior

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Journal of Materials Science & Technology 2018年第7期34卷 1180-1188页

作者： xiangzhao Zhang Guiwu Liu Junnan Tao Yajie Guo jingjing Wang Guanjun Qiao School of Materials Science and Engineering Jiangsu University Engineering Research Center of Transportation Materials of Ministry of Education School of Materials Science and Engineering Chang'an University School of Materials Science and Engineering Shanghai University State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University

Three novel Cu-Ni-A1 brazing filler alloys with Cu/Ni weight ratio of 4：1 and 2.5-10 wt% Al were developed and characterized, and the wetting of three Cu-Ni-Al alloys on WC-8Co cemented carbide were investigated at 1190-1210 ℃ by the sessile drop technique. Vacuum brazing of the WC-8Co cemented carbide to SAE1045 steel using the three Cu-Ni-Al alloys as filler metal was further carried out based on the wetting test results. The interfacial interactions and joint mechanical behaviors involving microhardness, shear strength and fracture were analyzed and discussed. The experimental results show that all the three wetting systems present excellent wettability with final contact angles of less than 5 °and fast spreading. An obvious degeneration layer with continuous thin strip forms in the cemented carbide adjacent to the Cu-Ni-A1/WC-8Co interface. The variation of microhardness in the joint cross-section is closely related to the interactions （such as diffusion and solid solution） of WC-8Co/Cu-Ni-Al/steel sys- tem. Compared with the other two brazed joints, the WC-8Co/Cu-19Ni-SAl/steel brazed joint presents more reliable interlayer microstructure and mechanical property while brazing at the corresponding wetting temperatures for 5 rain, and its average shear strength is over 200 MPa after further optimizing the brazing temperature and holding time. The joint shear fracture path passes along the degeneration layer, Cu-Ni-A1/WC-8Co interface and brazing interlayer, showing a mixed ductile-brittle fracture.2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： Cu-Ni-Al alloy Cemented carbide Brazing Microstructures Mechanical properties

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Integrating Shipborne Images with Multichannel Deep Learning for Landslide Detection

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Journal of Earth Science 2024年第1期35卷 296-300页

作者： Pengfei Feng Changdong Li Shuang Zhang Jie Meng jingjing Long School of Mechanical Engineering and Electronic Information China University of GeosciencesWuhan 430074China Faculty of Engineering China University of GeosciencesWuhan 430074China Department of Civil Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan 430074China College of Geology Engineering and Geomatics Changan UniversityXi'an 710054China Department of Geosciences University of OsloOslo 0316Norway

0 *** disasters in recession zones along riverbanks impose significant global social,economic,and ecological *** areas are particularly susceptible to *** inflict significant harm due to fluctuating water levels(Meng et al.,2023;Dai et al.,2021;Li et al.,2021).This,in turn,endangers the safety and accessibility of roads and waterways adjacent to rivers,and hydropower station and reservoir security(Yan et al.,2022;Guo et al.,2020;Tang et al.,2017).

关键词： reservoir Landslide Ship

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Identification of a Stable Quantitative Trait Locus for Percentage Grains with White Chalkiness in Rice (Oryza sativa)

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Journal of Integrative Plant Biology 2011年第8期53卷 598-607页

作者： Tao Guo xiaolu Liu xiangyuan Wan Jianfeng Weng Shijia Liu xi Liu Mingjiang Chen jingjing Li Ning Su Fuqing Wu Zhijun Cheng xiuping Guo Cailin Lei Jiulin Wang Ling jiang Jianmin Wan Key-Laborato'ry of Crop Genetics and Germplasm Enhancement/Jiangsu Plant Gene Engineering Research Center Nanjing Agricultural University Nanjing 210095 China Institute of Crop Sciences Chinese Academy of Agricultural Sciences Beijing 100081 China

High chalkiness is a major problem in many rice-producing areas of the world, especially in hybrid rice （Oryza sativa L.） in China. We previously showed a major quantitative trait locus for the percentage of grains with white chalkiness （QTLqPGWC-8） in the interval G1149-R727 on chromosome 8 using a chromosome segment substitution line （CSSL）. Here, we selected the line-CSSL50 harboring the QTLqPGWC-8 allele from the CSSLs derived from a cross between Asominori （as a recurrent parent） and IR24 （as a donor parent）, which had higher percentage chalkiness, markedly different from that of Asominori. There were also significant differences in starch granules, appearance of amylose content （AAC） and milling qualities between Asominori and CSSL50, but not in grain size or thousand grain weight （TGW）. The BC4F2 and BC4F3 populations from a cross between CSSL50 and Asominori were used for fine mapping of qPGWC-8. We narrowed down the location of this QTL to a 142 kb region between Indel markers 8G-7 and 8G-9. QTLqPGWC-8 accounted for 50.9% of the difference in PGWC between the parents. The markers tightly linked to qPGWC-8 should facilitate cloning of the gene underlying this QTL and will be of value for marker-assisted selection in breeding rice varieties with better grain quality.

关键词： fine mapping marker-assisted selection percentage grains with white chalkiness QTL rice.

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Intelligent multi-user detection using an artificial immune system

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Science in China(Series F) 2009年第12期52卷 2342-2353页

作者： GONG MaoGuo, JIAO LiCheng, MA WenPing & MA jingjing Key Laboratory of Intelligent Perception and Image Understanding of Ministry of Education of China Institute of Intelligent Information Processing, xidian University, xi’an 710071, China Key Laboratory of Intelligent Perception and Image Understanding of Ministry of Education of China Xidian University Xi’an China Institute of Intelligent Information Processing Xidian University Xi’an China

Artificial immune systems （AIS） are a kind of new computational intelligence methods which draw inspiration from the human immune system. In this study, we introduce an AIS-based optimization algorithm, called clonal selection algorithm, to solve the multi-user detection problem in code-division multipleaccess communications system based on the maximum-likelihood decision rule. Through proportional cloning, hypermutation, clonal selection and clonal death, the new method performs a greedy search which reproduces individuals and selects their improved maturated progenies after the affinity maturation process. Theoretical analysis indicates that the clonal selection algorithm is suitable for solving the multi-user detection problem. Computer simulations show that the proposed approach outperforms some other approaches including two genetic algorithm-based detectors and the matched filters detector, and has the ability to find the most likely combinations.

关键词： artificial immune systems clonal selection multi-user detection code-division multiple-access genetic algorithm

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Recent advances of carbon nanotubes in perovskite solar cells

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SusMat 2023年第5期3卷 639-670页

作者： xian-Gang Hu Zhenhua Lin Liming Ding jingjing Chang Advanced Interdisciplinary Research Center for Flexible Electronics Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’anChina State Key Discipline Laboratory ofWide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi’anChina Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijingChina

Perovskite solar cells(PSCs)have exhibited tremendous potential in photovoltaic fields owing to their appreciable performance and simple ***,device performances are still required to be further improved before commercial *** one-dimensional materials,carbon nanotubes(CNTs)have been utilized to regulate stability and efficiency of PSCs because of their excellent chemical stability,flexibility,as well as tunable optical and electrical *** this review,we comprehensively summarize various functions of CNTs in PSCs,such as transparent electrodes,hole/electron-transport layers,counter electrodes,perovskite additives,and ***,applications of CNTs toward the advancement of flexible and semitransparent PSCs are ***,we preview the challenges and research interests of using CNTs in high-efficiency and stable perovskite devices.

关键词： carbon nanotubes flexible solar cells long-term stability perovskite solar cells semitransparent solar cells

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Effect of sintering temperature in argon atmosphere on microstructure and properties of 3D printed alumina ceramic cores

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Journal of Advanced Ceramics 2020年第2期9卷 220-231页

作者： He LI Yongsheng LIU Yansong LIU Qingfeng ZENG Kehui HU Zhigang LU jingjing LIANG Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical UniversityXi’anShaanxi 710072China NPU-SAS Joint Research Center of Advanced Ceramics Northwestern Polytechnical UniversityXi’anShaanxi 710072China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

Alumina ceramics with different sintering temperatures in argon atmosphere were obtained using stereolithography-based 3D *** effects of sintering temperature on microstructure and physical and mechanical properties were *** results show that the average particle size,shrinkage,bulk density,crystallite size,flexural strength,Vickers hardness,and nanoindentation hardness increased with the increase in sintering temperature,whereas the open porosity decreased with increasing sintering *** change was observed in phase composition,chemical bond,atomic ratio,and surface *** the sintered samples,the shrinkage in Z direction is much greater than that in X or Y *** optimum sintering temperature in argon atmosphere is 1350℃with a shrinkage of 3.0%,3.2%,and 5.5%in X,Y,and Z directions,respectively,flexural strength of 26.7 MPa,Vickers hardness of 198.5 HV,nanoindentation hardness of 33.1 GPa,bulk density of 2.5 g/cm^3,and open porosity of 33.8%.The optimum sintering temperature was 70℃higher than that sintering in air atmosphere when achieved the similar properties.

关键词： sintering temperature argon atmosphere alumina ceramics microstructure stereolithography

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Recent Progress of Electrode Materials for Flexible Perovskite Solar Cells

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Nano-Micro Letters 2022年第7期14卷 179-208页

作者： Yumeng Xu Zhenhua Lin Wei Wei Yue Hao Shengzhong Liu Jianyong Ouyang jingjing Chang State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian University2 South Taibai RoadXi’an 710071People’s Republic of China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian University2 South Taibai RoadXi’an 710071People’s Republic of China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119People’s Republic of China Department of Materials Science and Engineering National University of Singapore7 Engineering Drive 1Singapore 117574Singapore

Flexible perovskite solar cells(FPSCs) have attracted enormous interest in wearable and portable electronics due to their high power-per-weight and low cost. Flexible and efficient perovskite solar cells require the development of flexible electrodes compatible with the optoelectronic properties of perovskite. In this review, the recent progress of flexible electrodes used in FPSCs is comprehensively reviewed. The major features of flexible transparent electrodes, including transparent conductive oxides, conductive polymer, carbon nanomaterials and nanostructured metallic materials are systematically compared. And the corresponding modification strategies and device performance are summarized. Moreover, flexible opaque electrodes including metal films, opaque carbon materials and metal foils are critically assessed. Finally, the development directions and difficulties of flexible electrodes are given.

关键词： Flexible electrode Flexible perovskite solar cell Carbon nanomaterials Metallic nanostructures Conductive oxide

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Variation of crystal orientation during epitaxial growth of dendrites by laser deposition

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Journal of Materials Science & Technology 2018年第4期34卷 732-735页

作者： Guowei Wang jingjing Liang Yizhou Zhou Libin Zhao Tao Jin xiaofeng Sun Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China xi'an Aero-engine Control Technology Co.Ltd Xi'an 710077China

A nickel-based superalloy was deposited onto a single crystal substrate based on epitaxial laser metal forming （E-LMF）. The microstructure development in two depositions has been researched. For the first time, the crystal orientation of dendrites varying beyond 20° was found when the dendrites deflected in deposition. In addition, a new grain boundary was found between different orientation dendrites in a grain, and the detected grain boundary angle was 23°. The result shows that flowing field in laser pool is responsible for this phenomenon.

关键词： Crystal orientation Epitaxial growth Laser deposition Single crystal Dendrite growth

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Defects and doping engineering towards high performance lead-free or lead-less perovskite solar cells

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Journal of Energy Chemistry 2022年第5期31卷 420-438页

作者： Wenying Cao Zhaosheng Hu Zhenhua Lin xing Guo Jie Su jingjing Chang Yue Hao State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi’an 710071ShaanxiChina Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi’an 710071ShaanxiChina

Up to now, perovskite solar cells(PSCs) have reached a certified 25.5% efficiency. As a promising photo-electric material, the metal halide perovskite possesses many outstanding properties such as tunable bandgap, long diffusion length, high absorption coefficient and carrier mobility. In spite of these remarkable properties, defects are inevitable during the solution processing. Therefore, many efforts have been made to reduce defects in perovskite films and thus improve the performance of devices. Among them,substitution or doping engineering is one of the most studied methods. Meanwhile, due to the poor stability of the organic-inorganic hybrid perovskite and the toxicity of Pb-based perovskite materials, all inorganic perovskite and lead-less or lead-free perovskite have emerged as promising materials. Here,we focus on the defect engineering especially substitutions on different sites in an ABX_(3) structure. The particular attention is devoted towards lead-less or lead-free perovskites, and we discuss several common elements or groups used to partially replace Pb^(2+). It is noted that proper elemental doping at different sites is an important guarantee for obtaining high-performance lead-less or lead-free PSCs.

关键词： Perovskite Defects Doping engineering Lead-free Lead-less Solar cells

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Which Factors Influence the Effect of Deep Synthesized Video Propagation

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Journal of Systems Science and Information 2024年第3期12卷 393-411页

作者： Lixia MA jingjing WANG Yiwei RU Yunjie WEI School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China School of Economics and Finance Xi'an Jiaotong UniversityXi'an 710061China Institute of Automation Chinese Academy of SciencesBeijing 100190China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China

Deep synthesis technology is an emerging artificial intelligence *** have been a large number of audio and video contents based on deep synthesis technology spreading in the *** this paper,we take the deep synthetic videos on YouTube platform as the research object,and investigate the factors influencing the propagation effect of deep synthetic videos by establishing an ordered probit *** is found that the effect of deep synthesized video transmission of YouTube platform is mainly influenced by factors such as the video type,video duration,influence of publishers and forms of *** addition,the comparative analysis of ordinary video and in-depth synthesized video reveals that both the video transmission effect are significantly affected by the video type,video duration and the influence of publishers.

关键词： deep synthesized video transmission effect ordered probit model

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