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Science china(Technological Sciences) 2005年第Z1期48卷 146-156页

作者： zhang lei1,2. wei zuoan1,{2., Chinese Academy of Sciences, Beijing 100080, china 2.Graduate School, Chinese Academy of Sciences, Beijing 100060, china institute of mechanics Chinese Academy of Sciences Beijing China Graduate School Chinese Academy of Sciences Beijing China

Three-dimensional discrete element face-to-face contact model with fissure water pressure is established in this paper and the model is used to simulate three-stage process of landslide under fissure water pressure in the opencast mine, according to the actual state of landslide in Panluo iron mine where landslide happened in 1990 and was fathered in 1999. The calculation results show that fissure water pressure on the sliding surface is the main reason causing landslide and the local soft interlayer weakens the stability of slope. If the discrete element method adopts the same assumption as the limit equilibrium method, the results of two methods are in good agreement; while if the assumption is not adopted in the discrete element method, the critical φ numerically calculated is less than the one calculated by use of the limit equilibrium method for the sameC. Thus, from an engineering point of view, the result from the discrete element model simulation is safer and has more widely application since the discrete element model takes into account the effect of rock mass structures.

关键词： face-to-facecontactmodel, fissure water pressure, three-dimensional discrete element method,landslide.

Fabricating bio-inspired high impact resistance carbon nanotube network films for multi-protection under an extreme environment

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Nano Research 2024年第9期17卷 7793-7802页

作者： Mingquan Zhu Kailu Xiao wei zhang Xudong {2. Yunxiang Bai Shijun Wang Peng zhang Feng Gao Congying Wang Wenqiang Xu Huiyong li Xianqian Wu Chao Wang Hui zhang Luqi liu Zhong zhang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Materials Science and Engineering Texas A&M UniversityCollege StationTexas 77840USA institute of mechanics Chinese Academy of SciencesBeijing 100190China School of Astronautics Harbin Institute of TechnologyHarbin150001China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China

The fabrication of light-weight,highly impact-resistant,and energy-absorbent materials is urgently demanded in many facets of the society from body armor to aerospace engineering,especially under an extreme *** nanotubes(CNTs),one of the strongest and toughest materials ever found,also have good conductivity,chemical stability,and thermal stability,etc,making them a competitive candidate as building blocks to help achieve the above *** this work,a kind of CNT network was prepared by using chlorosulfonic acid(CSA)to release the internal stress of super-aligned carbon nanotube films(SA-CNTF)and dendritic polyamide amine(PAMAM)to further introduce multiple hydrogen bonds and interlocking *** fabricated bioinspired carbon nanotube network films(PAMAM@C-CNTF)have a high toughness of 45.97 MJ/m3,showing an increase of 42.%compared to neat *** importantly,the anti-impact performance of the films(e.g.,with a maximum specific energy absorption of 1.40 MJ/kg under 80-100 m/s projectile impact)is superior to that of conventional protective materials from steel and Kevlar fiber,and also exceeds that of any other reported carbon-based *** hierarchical energy dissipation mechanism was further revealed through experiment and *** functions including intelligent heating/anti-icing,ultraviolet protection,as well as electromagnetic interference shielding properties make these network films have great potential in practical multi-protection applications,especially under an extreme environment.

关键词： carbon nanotubes composites mechanical properties multi-function

The global image of the Moon obtained by the Chang'E-1:Data processing and lunar cartography

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Science china Earth Sciences 2010年第8期53卷 1091-1102页

作者： li ChunLai1, liu JianJun1, REN Xin1, MOU lingli1, ZOU Yongliao1, zhang HongBo1, Lü Chang1, liu JianZhong1, ZUO wei1, SU Yan1, WEN weiBin1, BIAN wei1, ZHAO BaoChang2. YANG JianFeng2. ZOU XiaoDuan1, WANG Min1, XU Chun1, KONG DeQing1, WANG XiaoQian1, WANG Fang1, GENG liang1, zhang ZhouBin1, ZHENG {2., ZHU XinYing1, li JunDuo1 & OUYANG ZiYuan11 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012. china 2.Xi’an institute of Optics and Precision mechanics, Chinese Academy of Sciences, Xi’an 710119, china National Astronomical Observatories Chinese Academy of Sciences Beijing China Xi’an institute of Optics and Precision mechanics Chinese Academy of Sciences Xi’an China

The global lunar image of the first phase of Chinese Lunar Exploration Program is the first image that covered all over the surface of the Moon. It will serve as a critical foundation for succeeding exploration and scientific research. In this paper, the acquisition, characteristics, and data quality of Chang'E-1 CCD image data are described in detail. Also described are the methodology and procedure of data processing. According to rule of planetary cartography, the image data have been processed, geometrically corrected, and then mosaicked and merged in a scale of 1:2.5 million. The results of data processing and charting show that the image data of Chang'E-1 CCD and their geometric precision meet the demand of charting a map in the scale of 1:2.5 million. The relative geometric positioning precision of the global image is better than 2.0 m, and the absolute geometric positioning precision is slightly better than that of the ULCN2.05 and Clementine lunar basemap (V2.0). The plane positioning precision is approximately 100-1500 m. This global image proves to be the best global image of the Moon so far in terms of space coverage, image quality, and positioning precision.

关键词： Chang’E-1 lunar CCD data processing lunar image position lunar global image

Detector performance of the Gamma-ray Transient Monitor onboard DRO-A satellite

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Science china(Physics,mechanics & Astronomy) 2024年第11期67卷 75-90页

作者： Pei-Yi Feng Zheng-Hua An Da-li zhang Chen-wei Wang Chao Zheng Sheng Yang Shao-lin Xiong Jia-Cong {2. Xin-Qiao li Ke Gong Xiao-Jing {2. Min Gao Xiang-Yang Wen Ya-Qing {2. Xiao-Yun Zhao Fan zhang Xi-lei Sun Hong Lu Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

The Gamma-ray Transient Monitor(GTM) is an all-sky monitor onboard the Distant Retrograde Orbit-A(DRO-A) satellite with the scientific objective of detecting gamma-ray transients ranging from 2. ke V to 1 MeV. The GTM was equipped with five Gamma-ray Transient Probe(GTP) detector modules utilizing a NaI(Tl) scintillator coupled with a SiPM array. To reduce the SiPM noise, GTP uses a dedicated dual-channel coincident readout design. In this work, we first studied the impact of different coincidence times on the detection efficiency and ultimately selected a 0.5 μs time coincidence window for offline data processing. To test the performance of the GTPs and validate the Monte-Carlo-simulated energy response, we conducted comprehensive ground calibration tests using the Hard X-ray Calibration Facility(HXCF) and radioactive sources, including the energy response, detection efficiency, spatial response, bias-voltage response, and temperature dependence. We extensively present the ground calibration results and validate the design and mass model of the GTP detector, thus providing the foundation for in-flight observations and scientific data analysis.

关键词： NaI(Tl)detector energy response ground calibration gamma-ray detector DRO-A satellite

Numerical Simulation and Experimental Investigation of Springback in U-Channel Forming of Tailor Rolled Blank

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Journal of Iron and Steel Research International 2012年第9期19卷 8-12页

作者： zhang Hua-wei 1 , {2. li-zhong 1 , HU Ping 1 , {2. Xiang-hua 2.( 1.Faculty of Vehicle Engineering and mechanics , State Key Laboratory of Structural Analysis for Industrial Equipment , Dalian University of Technology , Dalian 11602. , liaoning ,{2. 2.Research institute of Science and Technology , Northeastern University , Shenyang 110819 , liaoning ,{2. ) Faculty of Vehicle Engineering and mechanics State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian Liaoning China Research institute of Science and Technology Northeastern University Shenyang Liaoning China

In order to grasp the springback rule of TRB ( tailor rolled blank ) parts after forming , the springback behavior of TRB was investigated by integrating such three means as theoretical research , numerical simulation and stamping *** theories of springback were *** stamping and springback processes of annealed 1.2./ 2.0mm TRB , 1.2.m and 2.0mm plates for U-channel were simulated , and the simulation results were compared with the *** results indicate that the springback of TRB falls in between those of the 1.2.m and 2.0mm *** is desirable for the TRB U-channel to have die clearance of 1.1times maximum blank thickness and friction coefficient of about 0.12., and longer thickness transition zone is *** simulation data demonstrate reasonably good agreement with the experiments.

关键词： tailor rolled blank U-channel springback annealing

Primary scientific results of Chang'E-1 lunar mission

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Science china Earth Sciences 2010年第11期53卷 1565-1581页

The strategic plan for the development of the unmanned Chinese Lunar Exploration Program is characterized by three distinct stages: "orbiting around", "landing on" and "returning from" the Moon. The first Chinese lunar probe, Chang'E-1, which was successfully launched on October 2.th, 2.07 at Xichang Satellite Launch Center, and guided to crash on the Moon on March 1st, 2.09, at 52.36°E, 1.50°S, in the north of Mare Fecunditatis, is the first step towards the "orbiting around" stage. The Chang'E-1 mission lasted 495 days, exceeding the expected life-span by about four months. A total of 1.37 TB raw data was received from Chang'E-1. It was then processed into 4 TB scientific data products at various levels. Many scientific results have been obtained by analyzing these data, including especially the "global lunar image from the first Chinese lunar explora- tion mission". All scientific goals of Chang'E-1 have been achieved. It provides much useful materials for further advances of lunar sciences and planetary chemistry. Meanwhile, these results will serve as a firm basis for future Chinese lunar missions.

关键词： lunar orbiter Chang’E-1 scientific data results

Critical serrated flow features during nanoindentation in La-based bulk metallic glasses

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International Journal of Minerals,Metallurgy and Materials 2007年第S1期15卷 8-12页

作者： wei Peng1), Taihua zhang2., Yuan {2.1), lei li1), and Bingchen wei1) 1) National Microgravity Laboratory, institute of {2., Chinese Academy of Sciences, Beijing 100080, china 2. State Key Laboratory of Nonlinear {2. (LNM), institute of {2., Chinese Academy of Sciences, Beijing 100080, china

La57.6Al17.5(Cu,Ni)2..9 and La64Al14(Cu,Ni)2. bulk metallic glasses (BMGs) were prepared by copper-mould casting method. Plastic deformation behavior of the two BMGs at various loading rates was studied by nanoindentation. The results showed that the La57.6Al17.5(Cu,Ni)2..9 BMG with a glass transition temperature of 42. K exhibited prominent serrated flow at low loading rates, whereas less pronounced serrated flow at high rates during nanoindentation. In contrast, the La64Al14(Cu,Ni)2. BMG with a glass transition temperature of 401 K exhibited prominent serrated flow at high loading rates. The different rate dependency of serrated flow in the two La-based BMGs is related to the different glass transition temperature, and consequently the degree of viscous flow during indentation at room temperature. A smoother flow occurs in the alloy with relatively lower glass transition temperature, due to the relaxation of stress concentration.

关键词： bulk metallic glass nanoindentation serrated flow shear band

Large-Scale Carbon Dioxide Storage in Salt Caverns:Evaluation of Operation,Safety,and Potential in china

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Engineering 2024年第9期40卷 226-246页

作者： wei liu Xiong {2. Jifang Wan Chunhe Yang liangliang Jiang {2.xin Chen Maria Jose Jurado Xilin Shi Deyi Jiang Wendong Ji Qihang li State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China china Energy Digital Technology Group Co.Ltd. Beijing 100044China institute of Rock and Soil mechanics Chinese Academy of SciencesWuhan 430064China Department of Chemical and Petroleum Engineering University of CalgaryCalgaryAB T2N 1N4Canada Eastern institute of Technology Ningbo 315200China Geosciences Barcelona CSIC Spanish National Research CouncilBarcelona 08028Spain

Underground salt cavern CO_(2. storage(SCCS)offers the dual benefits of enabling extensive CO_(2. storage and facilitating the utilization of CO_(2. resources while contributing the regulation of the carbon *** economic and operational advantages over traditional carbon capture,utilization,and storage(CCUS)projects make SCCS a more cost-effective and flexible *** the widespread use of salt caverns for storing various substances,differences exist between SCCS and traditional salt cavern energy storage in terms of gas-tightness,carbon injection,brine extraction control,long-term carbon storage stability,and site selection *** distinctions stem from the unique phase change characteristics of CO_(2. and the application scenarios of ***,targeted and forward-looking scientific research on SCCS is *** paper introduces the implementation principles and application scenarios of SCCS,emphasizing its connections with carbon emissions,carbon utilization,and renewable energy peak *** delves into the operational characteristics and economic advantages of SCCS compared with other CCUS methods,and addresses associated scientific *** this paper,we establish a pressure equation for carbon injection and brine extraction,that considers the phase change characteristics of CO_(2.,and we analyze the pressure during carbon *** comparing the viscosities of CO_(2. and other gases,SCCS’s excellent sealing performance is *** on this,we develop a long-term stability evaluation model and associated indices,which analyze the impact of the injection speed and minimum operating pressure on *** countermeasures to ensure stability are *** selection criteria for SCCS are established,preliminary salt mine sites suitable for SCCS are identified in china,and an initial estimate of achievable carbon storage scale in china is made at over 51.8-77.7 million tons,utilizing only 2.%-30%volume

关键词： Carbon-neutrality Salt cavern Large-scale CO_(2.storage Injection and withdrawal Stability analysis

Nano friction behaviour between magnetic materials and copper considering the inter-diffusion effect

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Friction 2024年第7期12卷 1532-1547页

作者： Zilin li lisha DOU Shiyu YANG Huajiang OUYANG Qichen ZHU Xiaoyang CHEN Xin JIA Shuaiwei DOU Xiaolong CUI Yudong zhang Jingjiang QIU Guochen QI Bangbang NIE Pan {2. Ronghan wei School of mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China Engineering Technology Research Center of Henan Province for MEMS Manufacturing and Application Zhengzhou UniversityZhengzhou 450001China institute of Intelligent Sensing Zhengzhou UniversityZhengzhou 450001China School of Engineering University of LiverpoolLiverpool L693GHUK School of Cyber Science and Engineering&Hanwei institute of Internet of Things Zhengzhou UniversityZhengzhou 450001China

Copper,permalloy,cobalt,and silicon are the materials that have been widely utilised in magnetic *** the size of interest is down to the nanoscale,the inter-diffusion between certain materials becomes *** paper studies the nanoscale friction characteristics between frictional pairs with and without inter-diffusion properties through the atomic force *** distinct evolution features of nanoscale friction force when inter-diffusion is involved are discovered experimentally,which is also confirmed through theoretical ***,through the thin film deposition method,four pairs of contact materials(Cu–Ni_(81)Fe_(19),Si–Ni_(81)Fe_(19),Cu–Co,Cu–Si)are designed for friction tests,in which diffusion occurs at the interface of Cu–Ni_(81)Fe_(19)***,the effects of sliding velocity and loading force on the nano friction of each pair are *** is found that regardless of the diffusion phenomenon:(1)the adhesion force values exhibit a notable correlation to the values of the friction force;(2.the friction force in all four material pairs consistently increases with the growth of the normal loading force,although the growth rate may *** terms of the sliding velocity effect,the friction forces of immiscible materials(Si–Ni_(81)Fe_(19),Cu–Co,and Cu–Si)are found to increase with the increasing sliding ***,the friction force of Cu–Ni_(81)Fe_(19),decreases with the increasing sliding ***,a compositive friction model considering both the velocity and the normal force effect was proposed,which shows good agreement with the experimental results and explains the nano friction behaviour of both miscible and immiscible metals.

关键词： atomic force microscope friction force normal load sliding velocity

licorice-saponin A3 is a broad-spectrum inhibitor for COVID-19 by targeting viral spike and anti-inflammation

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Journal of Pharmaceutical Analysis 2024年第1期14卷 115-127页

作者： Yang Yi Wenzhe li Kefang liu Heng Xue Rong Yu Meng zhang Yang-Oujie Bao Xinyuan Lai Jingjing Fan Yuxi Huang Jing Wang Xiaomeng Shi Junhua li Hongping {2. Kuanhui Xiang linjie li Rong zhang Xin Zhao Xue Qiao Hang Yang Min Ye State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing100191China Yunnan Baiyao International Medical Research Center Peking UniversityBeijing100191China CAS Key Laboratory of Pathogen Microbiology and Immunology Institute of MicrobiologyChinese Academy of SciencesBeijing100101China CAS Key Laboratory of Special Pathogens and Biosafety Center for Biosafety Mega-ScienceWuhan Institute of VirologyChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Department of Microbiology and Infectious Disease Center School of Basic Medical SciencesPeking University Health Science CenterPeking UniversityBeijing100191China Hubei Jiangxia Laboratory Wuhan430000China Shenzhen Children's Hospital ShenzhenGuangdong518036China

Currently,human health due to corona virus disease 2.19(COVID-19)pandemic has been seriously *** coronavirus severe acute respiratory syndrome coronavirus 2.SARS-CoV-2.spike(S)protein plays a crucial role in virus transmission and several S-based therapeutic approaches have been approved for the treatment of ***,the efficacy is compromised by the SARS-CoV-2.evolvement and *** we report the SARS-CoV-2.S protein receptor-binding domain(RBD)inhibitor licorice-saponin A3(A3)could widely inhibit RBD of SARS-CoV-2.variants,including Beta,Delta,and Omicron BA.1,XBB and ***,A3 could potently inhibit SARS-CoV-2.Omicron virus in Vero E6 cells,with EC50 of 1.016μ*** mechanism was related to binding with Y453 of RBD determined by hydrogen-deuterium exchange mass spectrometry(HDX-MS)analysis combined with quantum mechanics/molecular mechanics(QM/MM)***,phosphoproteomics analysis and multi fluorescent immunohistochemistry(mIHC)respectively indicated that A3 also inhibits host inflammation by directly modulating the JNK and p38 mitogen-activated protein kinase(MAPK)pathways and rebalancing the corresponding immune *** work supports A3 as a promising broad-spectrum small molecule drug candidate for COVID-19.

关键词： COVID-19 Inflammation licorice-saponin A3 Receptor-binding domain(RBD) SARS-CoV-2