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Damping behavior of Ti_(50.1)Ni_(49.9) alloy in reverse martensitic transformation region

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Science China(Technological Sciences) 2012年第2期55卷 470-474页

作者： ZENG JianMin JIANG HaiChang LIU shuwei RONG LiJian Institute of Metal Research Chinese Academy of sciencesShenyang 110016China

Damping behavior of Ti50.1Ni49.9 shape memory alloy during reverse martensitic transformation has been investigated by dynamic mechanical analyzer in a dual-cantilever mode. With the increase of strain amplitude, internal friction （IF） of the alloy increases in martensite and austenite states while decreases in transformation region. Based on the regularity of IF attenuation in isothermal condition, IFTr and （IFpT＋ 1FI） are decomposed from the strain amplitude dependent IF in transformation region. For practical application of shape memory alloys as a damping material, it is significant to evaluate the damping capacity by eliminating the influence of IFTr and consider its time independent real IF （IFpT＋ IFI）.

关键词： internal friction attenuation strain amplitude martensitic transformation shape memory alloys

Evolutionary Optimization Methods for High-Dimensional Expensive Problems:A Survey

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IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1092-1105页

作者： MengChu Zhou Meiji Cui Dian Xu shuwei Zhu Ziyan Zhao Abdullah Abusorrah Department of Electrical and Computer Engineering New Jersey Institute of TechnologyNewarkNJ 07102 USA School of Information and Electronic Engineering Zhejiang Gongshang UniversityHangzhou 310018China School of Intelligent Manufacturing Nanjing University of Science and TechnologyNanjing 210094China Institute of Systems Engineering Macao University of Science and TechnologyMacao 999078China School of Artificial Intelligence and Computer Jiangnan UniversityWuxi 214122China School of Information Science and Engineering Northeastern UniversityShenyang 110819China Center of Research Excellence in Renewable Energy and Power Systems Department of Electrical and Computer EngineeringFaculty of EngineeringKing Abdulaziz UniversityJeddah 21589Saudi Arabia K.A.CARE Energy Research and Innovation Center King Abdulaziz UniversityJeddah 21589Saudi Arabia

Evolutionary computation is a rapidly evolving field and the related algorithms have been successfully used to solve various real-world optimization *** past decade has also witnessed their fast progress to solve a class of challenging optimization problems called high-dimensional expensive problems(HEPs).The evaluation of their objective fitness requires expensive resource due to their use of time-consuming physical experiments or computer ***,it is hard to traverse the huge search space within reasonable resource as problem dimension *** evolutionary algorithms(EAs)tend to fail to solve HEPs competently because they need to conduct many such expensive evaluations before achieving satisfactory *** reduce such evaluations,many novel surrogate-assisted algorithms emerge to cope with HEPs in recent *** there lacks a thorough review of the state of the art in this specific and important *** paper provides a comprehensive survey of these evolutionary algorithms for *** start with a brief introduction to the research status and the basic concepts of ***,we present surrogate-assisted evolutionary algorithms for HEPs from four main *** also give comparative results of some representative algorithms and application ***,we indicate open challenges and several promising directions to advance the progress in evolutionary optimization algorithms for HEPs.

关键词： computer optimization evolutionary

Growth of SiC as Binder to Adhere Diamond Particle and Tribological Properties of Diamond Particles Coated SiC

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Journal of Materials Science & Technology 2015年第11期31卷 1133-1138页

作者： Shengjie Yu Zhaofeng Chen Yang Wang shuwei Hu Ruiying Luo Sheng Cui Super Insulation Composite Laboratory College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Center of Materials Physics and Chemistry School of Physics and Nuclear Energy Engineering Beijing University of Aeronautics and Astronautics College of Materials Science and Engineer Nanjing Tech University

The purpose of this work was to grow SiC as binder to adhere diamond particles to graphite substrate by low pressure chemical vapor deposition （LPCVD） at 1100 ℃ and 100 Pa using methyltrichlorosilane （MTS： CH3SiCl3） as precursor. The composite coatings on graphite substrates were analyzed by various techniques. Results show that a dense SiC coating with a cloud-cluster shape was formed both on the diamond particles and the substrate after deposition, The thermal stress （290.6 MPa） strengthened the interfacial bonding between the diamond particle and the SiC coating, which is advantageous for the purpose of adhering diamond particles to graphite substrate. The applied load of sliding wear test was found to affect not only the friction coefficient, but also the wear surface morphology. With increasing loads, the asperity penetration was high and the friction coefficient decreased.

关键词： Diamond particle LPCVD (low pressure chemical vapor deposition) SiC Tribological performance

Rock magnetism and magnetic anisotropy in folded sills and basaltic flows:A case study of volcanics from the Taimyr Peninsula, Northern Russia

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Chinese Science Bulletin 2008年第5期53卷 759-767页

作者： ZHANG shuwei J. Harald WALDERHAUG YANG YueJun College of Computer Engineering and Software Taiyuan University of Technology Taiyuan 030024 China Department of Earth Sciences University of Bergen AIl~gaten 415007 Bergen Norway State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China Department of Applied Physics Taiyuan University of Technology Taiyuan 030024 China

Magnetic measurements were performed on apparently deformed igneous rocks of 23 sites from the southeastern part of the Taimyr Peninsula. Rock magnetism and reflected light microscopy analyses reveal that fine-grained titanomagnetites up to pure magnetites mainly carry the majority of magnetic fabrics in the sills, and that the slightly coarser Ti-poor or -medium titanomagnetites carry most mag-netic fabrics in the basaltic flows. Magnetic anisotropies were determined by applying anisotropy of low-field magnetic susceptibility (AMS) on 180 unheated samples and 128 samples that had been pre-viously heated to 600°C during a paleomagnetic study to detect heating effects on the anisotropy of magnetic susceptibility (AMS) properties of volcanic rocks. Laboratory heating significantly affects anisotropy variations of these igneous rocks corresponding to the mineralogical changes during the heat treatment.

关键词：岩石磁学磁各向异性玄武岩折叠式岩床俄罗斯

A Novel TiNi/AlSi Composite with High Strength and High Damping Capacity

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Journal of Materials Science & Technology 2008年第6期24卷 903-906页

作者： shuwei LIU Xiuyan LI Desheng YAN Haichang JIANG Lijian RONG Institute of Metal Research Chinese Academy of Science Shenyang 110016 China

A novel TiNi/AlSi composite with high compressive strength and high damping capacity was obtained by infiltrating Al-12%Si alloy into porous TiNi *** had been found that the high compressive strength (440 MPa) of TiNi/AlSi composite is due to the increase of effective carrying area after infiltrating Al-12%Si alloy,while the high damping capacity is contributed to TiNi carcass,Al-12%Si filling material and micro- slipping at the interface.

关键词： Damping capacity Internal friction TiNi/AlSi composite Compressive strength

Remote impacts from the tropical Indian Ocean on haze pollution in January over the Yangtze River Delta

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Atmospheric and Oceanic Science Letters 2021年第3期14卷 49-53页

作者： shuwei Xia Zhicong Yin Huijun Wang Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjingChina Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) ZhuhaiChina Nansen-Zhu International Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina

Haze events in the Yangtze River Delta(YRD)region have recently been occurring more frequently and with dramatic damages inflicted on human and ecosystem *** this study,observational analyses and numerical experiments are used to investigate the meteorological conditions associated with haze pollution,with the main emphasis on the impacts of the preceding sea surface temperature(SST)in the tropical Indian Ocean(TIO).The results show that the December SST in the TIO has a significant positive correlation with the number of haze days in January over the YRD,especially during 1999–*** December,the positive SST anomalies in the TIO heat the overlying air,and then in the following January provoke a Matsuno–Gill-like pattern and a series of Rossby wave–like trains in the upper troposphere,transmitting signals to the YRD and downstream through the Sea of Japan and Aleutian *** cyclonic anomalies in the YRD seem to significantly weaken the East Asian jet stream by means of anomalous easterlies,and subsequently affect the climate in the *** the surface,the increased surface air temperature and southerly winds,along with the decreased surface wind speed,accompanied by influences from upstream areas,are conducive to the occurrence of *** observational results were also reproduced well in CESM-LE simulations.

关键词： Sea surface temperature Tropical indian ocean Haze pollution CESM-LE

基于PLC的掘进机主轴承缩比试验台控制系统设计

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工业仪表与自动化装置 2025年第1期 8-12,59页

作者：范书伟高宏力曹奥西南交通大学机械工程学院四川成都610031

为了研究掘进机主轴承在载荷作用下的动力学特性,考虑到掘进机设备的复杂性,于是根据缩比模型试验理论搭建掘进机主轴承缩比试验台,并基于汇川PLC对试验台控制系统进行设计。试验台通过PLC建立EtherCAT总线通信网络,通过触摸屏操作界面... 详细信息

为了研究掘进机主轴承在载荷作用下的动力学特性,考虑到掘进机设备的复杂性,于是根据缩比模型试验理论搭建掘进机主轴承缩比试验台,并基于汇川PLC对试验台控制系统进行设计。试验台通过PLC建立EtherCAT总线通信网络,通过触摸屏操作界面执行操作,能对加载缸的载荷大小进行调节控制。经过测试,基于PLC的掘进机轴承缩比试验台控制系统稳定性好、可靠性高且人机交互友好,便于后续主轴承载作用下动力学特性研究的开展,也为相关轴承试验台的设计提供了一些思路和参考价值。

关键词： PLC 缩比试验台伺服控制触摸屏

Degradation of black tea theaflavin through C-ring cleavage by gut microbiota

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Food Science and Human Wellness 2022年第3期11卷 598-605页

作者： shuwei Zhang Christina Ohland Christian Jobin Shengmin Sang Laboratory for Functional Foods and Human Health Center for Excellence in Post-Harvest TechnologiesNorth Carolina Agricultural and Technical State UniversityNorth Carolina Research CampusKannapolisNorth Carolina 28081USA Department of Medicine University of FloridaGainesvilleFlorida 32611USA Department of Infectious Diseases and Immunology University of FloridaGainesvilleFlorida 32611USA

Increasing evidence has shown that gut microbiota plays important roles in metabolizing large molecular polyphenols to bioavailable and bioactive microbial ***(TF)is one of the major color compounds in black tea and has demonstrated anti-inflammation,antioxidant,and anticancer effects ***,little is known about the metabolism of TF by gut microbiota in *** this study,following the administration of TF to mice,the C-ring cleavage metabolites,dihydro-and tetrahydro-theaflavin(DH-TF and TH-TF)were detected in mouse feces by LC-MS and validated by authentic standards from in situ chemical *** observation of the C-ring cleavage metabolites in TF-treated conventionalized mice but not in germ-free(GF)mice confirmed the role of gut microbiota in cleaving the C-rings of *** detection of DH-TF from the anaerobic incubation of TF with catechin-converting gut bacteria,Eggerthella lenta(Eggerth),suggested that the microbes with the capacity to cleave the C-ring of catechins were able to metabolize TF following the same ***,three small phenolic metabolites were detected in mouse feces,and one of them was primarily detected in SPF mice not GF mice,which revealed that TF,subsequent to the cleaved C-ring,can be further metabolized into smaller phenolic metabolites by gut ***-dependent production of these metabolites were observed from the administration of 100 mg/kg to 400 mg/kg body weight of *** conclusion,gut microbiota can metabolize TF to the open-ring metabolites and the phenolic metabolites through the C-ring cleavage in mice.

关键词： Theaflavin Black tea C-ring cleavage Anaerobic incubation Germ-free mice

Evolution of the Neoproterozoic rift basins and its implication for oil and gas exploration in the Tarim Basin

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Petroleum Research 2018年第1期3卷 66-76页

作者： Rong Ren shuwei Guan Lin Wu Guangyou Zhu PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China

According to the aeromagnetic,seismic,and geological data,the surface structure,sedimentation,and distribution characteristics as well as the deep dynamic mechanism of the north-south differentiated Neoproterozoic rift basins were well investigated to reveal the tectonic evolution and its control on the distribution of the Early Cambrian sedimentary basin and source rocks in the Tarim *** rift basin in the southern Tarim was a product of superplume activities during the early breakup period of the Rodinia *** initiated in the Early Cryogenian(about 780 Ma)and appeared as NE-direction aulacogens extending into the Tarim *** rift basin in the northern Tarim was a back-arc rift basin derived from the subduction of Pan-Rodinian oceanic plate,which initiated in the Late Cryogenian(about 740 Ma)and occurred as a nearly EW-direction narrow band across the Tarim *** northern Tarim back-arc rift basin had similar formation and evolution process to the Late Mesozoic-Cenozoic back-arc rift basins in East Asia,both showing an oceanward migration;however,the Tarim rift basin finally evolved from the fault-depression basins into passive continental *** Neoproterozoic rift basins controlled not only the distribution of source rocks in the syn-rift period but also the development of Early Cambrian sedimentary *** EW-distributed syn-rift(Cryogenian to Ediacaran)and postrift(Lower Cambrian Yurtusi period)source rocks were likely to develop between the present Tabei uplift and central uplift belt.

关键词： Neoproterozoic Rift Dynamic mechanism Subduction Mantle plume Source rock Tarim basin