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Anomalous temperature dependence of the electrical resistivity of molten Sb

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Chinese Science Bulletin 2001年第17期46卷 1431-1433页

作者： WANG Qiang lu kunquan LI Yanxiang Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Institute of Physics Chinese Academy of SciencesBeijing 100080China

Using the d.c. four-probe method, the electrical resistivity of high-purity liquid Sb has been accurately measured as functions of temperature. It is observed that the resistivity of liquid Sb changes abnormally with increasing temperature, which is very different from that of simple liquid metals. Based on the reported structure factor at several temperatures, the results obtained in this work have been discussed and interpreted qualitatively according to Ziman theory. The analysis suggests that the existence of short-range order structure near the melting point can account for the abnormal phenomenon observed in the resistivity of liquid Sb, in which semimetal-metal transaction takes place in the melting process. At the same time, the progress of the structure change of liquid Sb with temperature has also been pointed

关键词： liquid metal electrical resistivity structure change.

Properties of Molten Potassium Niobate System

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Chinese Physics Letters 1995年第2期12卷 83-86页

作者： HONG Xinguo lu kunquan ZHAO Yaqin WU Xing Institute of Physics Academia SinicaBeijing 100080

The density and surface tension of the K_(2)O-Nb_(2)O_(5) molten system between 50 and 56mol%K_(2)O melts were measured from 1080 to 1180℃.The concentration of K_(2)O from 50 to 56mol%in melt not only caused the density of melt to decrease,but also induced the surface tension to *** composition gradient and the temperature coefficient of density exist extremum within this composition *** properties are possibly employed to explain why the KNbO3 crystal should be grown at the composition from 52 to 54mo1%K_(2)O at above 1150℃.

关键词： tension surface coefficient

Structural studies on the disorder system of liquid gallium

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Chinese Science Bulletin 1998年第5期43卷 396-398页

作者： Shiqiang Wei Wenhan Liu Tiandou Hu Yuren Wang kunquan lu Univ Sci & Technol China Hefei Natl Sunchrotron Radiat Lab Ctr Fundamental Phys Hefei 230026 Peoples R China Beijing Natl Sunchrotron Radiat Lab Beijing 100039 Peoples R China Chinese Acad Sci Inst Phys Beijing 100080 Peoples R China

Studies the structures and properties of liquid materials quantitatively. X-ray absorption fine structure (XAFS) as a tool used to probe the local structure of disordered systems such as liquid materials; Factors attr... 详细信息

关键词： liquid Ga XAFS disorder system.

PHASE CONTENT AND ATOMIC STRUCTURE DETERMINATION IN TWO-PHASES SYSTEMS BY EXAFS

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Chinese Physics Letters 1986年第8期3卷 341-344页

作者： lu kunquan WAN Jun JIANG Wei Institute of Physics Academia SinicaBeijing Beijing University of Iron and Steel Technology Beijing

A method of EXAFS analysis to determine phase content and local structure surrounding same type atoms in different phase of a mixed phases system is proposed.A general expression of c(k)function for a two phases system is *** verify the method,the EXAFS of some specimens were measured and *** results agreed well with expected ones.

关键词： EXAFS system verify

New Dispersed Phase of Electrorheological Fluids:TiO_2 Coating Graphite Particles

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Journal of Materials Science & Technology 2000年第5期16卷 529-530页

作者： Sujuan XU+ and Biao WANG (Harbin Institute of Technology, Harbin 150001, China) Shouqiang MEN and kunquan lu (Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China) Harbin Institute of Technology Harbin 150001 China Institute of Physics Chinese Academy of Sciences Beijing 100080 China

We have prepared novel coated particles, with a conductor graphite core and a dielectric TiO2 coating, as the dispersed phase of electrorheological fluids. One order of magnitude enhancement in the shear stress is obtained by using such composite particles, when it is compared with that of TiO2 particles. The experimental results show a way to get excellent ER system.

关键词： New Dispersed Phase of Electrorheological Fluids Graphite TiO

The earthquake precursor detected in a granular medium and a proposed model for the propagation of precursive stress-strain signal

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Chinese Science Bulletin 2011年第11期56卷 1071-1079页

作者： lu kunquan HOU MeiYing WANG Qiang PENG Zheng SUN Wei SUN XiaoMing WANG YuYing TONG XiaoHui JIANG ZeHui LIU JiXing Beijing National Laboratory for Condensed Matter Physics Key Laboratory of Soft Matter Physics Institute of Physics Chinese Academy ofSciences Beijing 100190 China Beijing Precision Technology Co. Ltd Beijing 100089 China Earthquake Administration of Liaoning Province Shenyang 110034 China Department of Applied Physics Harbin Institute of Technology Harbin 150001 China' Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

A way to detect the seismic precursor in granular medium is described and a model of propagation for precursive stress-strain signals is proposed.A strain sensor buried in a sandpit is used to measure a seismic precursor *** signal has been investigated and confirmed to originate from a specific earthquake.A comparison of simulated and experimental signals indicates that the signal results from the strain in the earth's *** on the behavioral characteristics of granular materials,an analysis of why this method can be so sensitive to the seismic strain signal is undertaken and a model for the propagation of this stress-strain signal is *** Earth's lithosphere is formed of tectonic plates,faults and fault gouges at their *** the case of the quasi-static mechanics of seismic precursory stress-strain propagation,the crustal lithosphere should be treated as a large-scale granular *** a seismogenic event,accumulated force generates the stick-slip motion of adjacent tectonic plates and incrementally pushes blocks farther apart through stick-slip *** shear force released through this plate displacement causes soil compression *** discrete properties of the sand in the sandpit lead to the sensitive response of the sensor to the deformation signal which enables it to detect the seismic *** the analysis of the mechanism of the stress-strain propagation in the lithosphere,an explanation is found for the lack of signal detection by sensors installed in *** principles and method presented in this paper provide a new technique for investigating seismic precursors to shallow-source earthquakes.

关键词：地震前兆信号传播应力应变信号检测颗粒介质信号模型岩石圈板块应变信号

On the Spatial Configuration of the Mitotic Spindle

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Chinese Physics Letters 1995年第3期12卷 186-188页

作者： WEN Weijia SUN Limin lu kunquan TANG Xiaowei Institute of Physics Academia SinicaBeijing 100080 Institute of High Energy Physics Academia SinicaBeijing 100039

An experimental simulation using electrorheological(ER)fluid is developed to investigate the spatial configuration of the mitotic *** the presence of two different kinds of electric field,the structures of particle arrangement in ER fluid are similar to the configuration of the mitotic spindle of the animal and plant cells respectively.

关键词： Configuration arrangement configuration

Conductance and dielectric properties of pure C_(60) single crystal

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Chinese Science Bulletin 1997年第1期42卷 40-43页

作者： YANG Guoquan, WANG Gang, WEN Weijia, ZHOU Weiya, lu kunquan and XIE Sisheng1. Central University for Nationalities, Beijing 100081, China 2. Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China Central University for Nationalities Beijing China Institute of Physics Chinese Academy of Sciences Beijing China

THE C60 is the third stable allotrope of carbon. Much attention has been focused on C60 since it has unique properties. Much work has been carried out on it, such as the preparation of large quantities of C60, the structure studies of C60, the superconducting alkali-metal-C60 compounds, the growth of pure C60 single crystal. There is still a lot of work to do in detail, but because the size of the single ctystal is not large enough, there is some difficulty in research, for example, the electric and optical properties of the C60 single crystal.

关键词： C60 single crystal vapor phase growth conductance dielectric properties.

Experimental Study of Segregation Patterns in Binary Granular Mixtures under Vertical Vibration

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Experimental Study of Segregation Patterns in Binary Granula...