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中国有色金属学会会刊：英文版 1994年第2期4卷 82-85页

作者： Pu,Fengnian(Institute of high-Temperature and high-pressure physics,Chengdu University of Science and Technology,Chengdu 610065) Chengdu Univ of Science and Technology Chengdu China

ＰＲＥＳＳＵＲＥ－ＩＮＤＵＣＥＤ４ｐ→４ｓＥＬＥＣＴＲＯＮＴＲＡＮＳＦＥＲＡＮＤＩＴＳＥＦＦＥＣＴＯＮＥＬＥＣＴＲＩＣＡＬＴＲＡＮＳＰＯＲＴＯＦＣＯＰＰＥＲＰＲＥＳＳＵＲＥ－ＩＮＤＵＣＥＤ４ｐ→４ｓＥＬＥＣＴＲＯＮＴ... 详细信息

ＰＲＥＳＳＵＲＥ－ＩＮＤＵＣＥＤ４ｐ→４ｓＥＬＥＣＴＲＯＮＴＲＡＮＳＦＥＲＡＮＤＩＴＳＥＦＦＥＣＴＯＮＥＬＥＣＴＲＩＣＡＬＴＲＡＮＳＰＯＲＴＯＦＣＯＰＰＥＲＰＲＥＳＳＵＲＥ－ＩＮＤＵＣＥＤ４ｐ→４ｓＥＬＥＣＴＲＯＮＴＲＡＮＳＦＥＲＡＮＤＩＴＳＥＦＦＥ...

关键词： high pressure copper electron transfer electrical resistance

Density-functional theory study of the effect of pressure on the elastic properties of CaB_6

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Chinese physics B 2013年第7期22卷 420-425页

作者：韩晗 Surface physics laboratory (National Key laboratory) Key Laboratory of Computational Physical Sciencesand Department of PhysicsFudan University

Under high pressure, the long believed single-phase material CaB6 was latterly discovered to have a new phase tI56. Based on the density-functional theory, the pressure effects on the structural and elastic properties of CaB6 are obtained. The calculated bulk, shear, and Young’s moduli of the recently synthesized high pressure phase tI56-CaB6 are larger than those of the low pressure phase. Moreover, the high pressure phase of CaB6 has ductile behaviors, and its ductility increases with the increase of pressure. On the contrary, the calculated results indicate that the low pressure phase of CaB6 is brittle. The calculated Debye temperature indicates that the thermal conductivity of CaB6 is not very good. Furthermore, based on the Christoffel equation, the slowness surface of the acoustic waves is obtained.

关键词： density-functional theory elastic properties pressure effects acoustic properties

Mechanisms of the pancake vortex and vortex line movement in the high T_c superconductors Bi_2Sr_2CaCu_2O_8+δ and La_(1.93)Sr0.0_7CuO_4+δ

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Science china(physics,Mechanics & Astronomy) 2007年第2期50卷 240-248页

作者： WANG WeiXian1,ZHOU Fang2,TAN Shun1,WU Huan1 & ZHANG YuHeng1 1 National high Magnetic Field laboratory,University of Science and Technology of china,Hefei 230026,china 2 National laboratory for Superconductivity,lnstitute of physics and the Center for Condensed Matter physics,Chinese Academy of Sciences,Beijing 100080,china National high Magnetic Field laboratory University of Science and Technology of China Hefei China National laboratory for Superconductivity Institute of Physics and the Center for Condensed Matter Physics Chinese Academy of Sciences Beijing China

In the strict sense, it is not very clear why with magnetic field increasing, the normal-superconductive (NS) transition becomes broad for Bi2Sr2CaCu208+δ(Bi2212) while the NS transitions are almost parallel for La193Sroo7Cu04+δ(La214). In this paper, R-T relations are measured by the six-probe method. We propose a moving mechanism of the pancake vortex and vortex line for Bi2212. The theoretical curves fit the experiment data well.

关键词： superconductivity superconductive pancake vortex dynamics

Evanescent Waves and Energy Conservation

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Chinese Journal of Lasers 1996年第5期B5卷 439-443页

作者： CAO Qing DENG Ximing (National laboratory on high Power Laser and physics,Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Shanghai 201800, china) Shanghai Inst of Optics and Fine Mechanics Shanghai China

ＥｖａｎｅｓｃｅｎｔＷａｖｅｓａｎｄＥｎｅｒｇｙＣｏｎｓｅｒｖａｔｉｏｎＣＡＯＱｉｎｇ；ＤＥＮＧＸｉｍｉｎｇ（ＮａｔｉｏｎａｌＬａｂｏｒａｔｏｒｙｏｎＨｉｇｈＰｏｗｅｒＬａｓｅｒａｎｄＰｈｙｓｉｃｓ，Ｓｈａｎｇｈａｉ... 详细信息

ＥｖａｎｅｓｃｅｎｔＷａｖｅｓａｎｄＥｎｅｒｇｙＣｏｎｓｅｒｖａｔｉｏｎＣＡＯＱｉｎｇ；ＤＥＮＧＸｉｍｉｎｇ（ＮａｔｉｏｎａｌＬａｂｏｒａｔｏｒｙｏｎＨｉｇｈＰｏｗｅｒＬａｓｅｒａｎｄＰｈｙｓｉｃｓ，ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓ...

关键词： evanescent wave energy conservation law

Vapor-hydrate phases equilibrium of (CH_4+C_2H_6) and (CH_4+C_2H_4) systems

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Petroleum Science 2008年第4期5卷 359-366页

作者： Ma Qinglan Chen Guangjin Zhang Lingwei high pressure Fluid Phase Behavior ＆ Property Research laboratory China University of Petroleum Beijing 102249 China

Separation of the （C1 ＋ C2） hydrocarbon system is of importance in natural gas processing and ethylene production. However it is the bottleneck because of its high refrigeration energy consumption, and needs to be urgently addressed. The technology of separating gas mixtures by forming hydrate could be used to separate （C1 ＋ C2） gas mixtures at around 0℃ and has attracted increasing attention worldwide. In this paper, investigation of vapor-hydrate two-phase equilibrium was carried out for （C1 ＋ C2） systems with and without tetrahydrofuran （THF）. The compositions of vapor and hydrate phases under phase equilibrium were studied with model algorithm when structure Ⅰ and structure Ⅱ hydrates coexisted for the （methane ＋ ethane） system. The average deviation between the modeled and actual mole fractions of ethane in hydrate and vapor phases was 0.55%, and that of ethylene was 5.7% when THF was not added. The average deviation of the mole fraction of ethane in vapor phase was 11.46% and ethylene was 7.38% when THF was added. The test results showed that the proposed algorithm is practicable.

关键词： Chen-Guo model vapor-hydrate equilibrium gas separation

New evidence for lack of CMB power on large scales

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Science china(physics,Mechanics & Astronomy) 2010年第3期53卷 567-570页

作者： LIU Hao1 & LI TiPei1,2,3 1 Key laboratory of Particle Astrophysics, Institute of high Energy physics, Chinese Academy of Sciences, Beijing 100049, china 2 Department of physics & Center for Astrophysics, Tsinghua University, Beijing 100084, china 3 Department of Engineering physics & Center for Astrophysics, Tsinghua University, Beijing 100084, china Key laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing China Department of physics & Center for Astrophysics Tsinghua University Beijing China Department of Engineering physics & Center for Astrophysics Tsinghua University Beijing China

A digitalized temperature map is recovered from the first light sky survey image published by the Planck team, from which an angular power spectrum of the cosmic microwave background (CMB) is derived. The amplitudes of the low multipoles (low-l) measured from the preliminary Planck power spectrum are significantly lower than those reported by the WMAP team. Possible systematical effects are far from enough to explain the observed low-l differences.

关键词： cosmology cosmic microwave background data analysis

A numerical study on Rayleigh-Taylor instability of aluminum plates driven by detonation

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Science china(physics,Mechanics & Astronomy) 2010年第2期53卷 195-198页

作者： HE ChangJiang,ZHOU HaiBing & HANG YiHong Institute of Applied physics and Computational Mathematics,laboratory of Computational physics,Beijing 100088,china Institute of Applied physics and Computational Mathematics Laboratory of Computational Physics Beijing China

The authors,using elastic-plastic hydrodynamic code,present the Rayleigh-Taylor (RT) instability of Al plates driven by high-explosive detonation. Our numerical study assumes the material is fluid,or it is an elastic-plastic solid,and we compare the results of these simulations with the experimental data. For the numerical simulation of Rayleigh-Taylor instability of the metal driven by high-explosive detonation,the elastic-plastic effect must be assumed. The result of the simulation is different from the experiment,using only equation of state. However,the growth of perturbation agrees well with the measured growth under the second assumption. There is a cutoff wavelength for RT instability of the metal. The growth of perturbation is stable for short wavelength. The growth increases rapidly as the wavelength increases.

关键词： interface instability elastic-plastic numerical simulation

Using Pure-Phase Element Array to Generate Uniform Laser Focal Profiles

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Chinese Journal of Lasers 1996年第3期B5卷 253-259页

作者： QIU Yue FAN Dianyuan(National laboratory on high Power Laser and physics,Shanghai Institute of Optics and Fine Mechanics,Academia Sinica,P.O.Box 800-211, Shanghai 201800, china)DENG Xuegong LI Yongpin(Department of physics, china University of Science a Shanghai Inst of Optics and Fine Mechanics Academia Sinica Shanghai China

Ｕｓｉｎｇ　Ｐｕｒｅ－Ｐｈａｓｅ　Ｅｌｅｍｅｎｔ　Ａｒｒａｙ　ｔｏ　Ｇｅｎｅｒａｔｅ　Ｕｎｉｆｏｒｍ　Ｌａｓｅｒ　Ｆｏｃａｌ　ＰｒｏｆｉｌｅｓＵｓｉｎｇＰｕｒｅ－ＰｈａｓｅＥｌｅｍｅｎｔＡｒｒａｙｔｏＧｅｎｅｒａｔｅ... 详细信息

Ｕｓｉｎｇ　Ｐｕｒｅ－Ｐｈａｓｅ　Ｅｌｅｍｅｎｔ　Ａｒｒａｙ　ｔｏ　Ｇｅｎｅｒａｔｅ　Ｕｎｉｆｏｒｍ　Ｌａｓｅｒ　Ｆｏｃａｌ　ＰｒｏｆｉｌｅｓＵｓｉｎｇＰｕｒｅ－ＰｈａｓｅＥｌｅｍｅｎｔＡｒｒａｙｔｏＧｅｎｅｒａｔｅＵｎｉｆｏｒｍＬａｓｅｒＦｏｃａｌ...

关键词： pure-phase element array uniform laser profile uniform illumination

Ab initio study of a Y-doped Σ31 grain boundary in alumina

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Science china(physics,Mechanics & Astronomy) 2008年第11期51卷 1607-1615页

作者： CHEN Jun, XU Yun, CHEN DongQuan & ZHANG JingLin laboratory of Computational physics, Institute of Applied physics and Computational Mathematics, Beijing 100088, china laboratory of Computational physics Institute of Applied Physics and Computational Mathematics Beijing China

The atomic structures and energetics of clean and Y-doped general grain boundary (GB) Σ31/(0001) models in α-Al2O3 are studied by a series of high precision ab initio calculations. A large supercell with 700 atoms and periodic boundary conditions is adopted for undoped and Y-doped GB with different substitution sites and con-centrations. It is shown that Y atoms preferably segregate to the central column of the 7-member Al ring. This is explained as more favorable bond formation for Y in this position and lower GB energy. The calculated GB formation energy for the clean and Y-doped cases is respectively 3.99 and 3.67 J/m2. On the average, the GB region in Σ31 has a slightly lower charge density than the bulk crystalline region. In addtition, the GB induces a long ranged asymmetric electrostatic potential distri-bution on each side of the grain boundary.

关键词： alumina grain boundary Y-doped ab initio