检索结果-南通市图书馆

Experimental investigation of supersonic radiation propagation in low-density plastic and copper-doped foams

Science china(physics,Mechanics & Astronomy) 2005年第5期48卷 549-558页

作者： JIANG Shaoen1, XU Yan2. DING Yongkun1, LAI Dongxian2. ZHENG Zhijian1, HUANG Yixiang1, LI Jinghong2. SUN Kexu1, HU Xin1, ZHANG Wenhai1, YI Rongqing1, CUI Yanli1 & CHEN Jiusen1 1. National Key laboratory of Laser Fusion, Laser Fusion Research Center, Mianyang 62.900, china 2. {2. of applied physics and Computation mathematics, beijing, 1.0088. china National Key laboratory of Laser Fusion Laser Fusion Research Center Mianyang 621900 China institute of applied {2. and Computation mathematics Beijing 100088 China

Eight beams of 0.35 μm laser with pulse duration of 1 ns and total energy of 2.kJ enter into a hohlraum to create intense X-ray radiation of 140 eV on the Shenguang ΙΙ laser facility. Plastic foam (C6H12. and copper-doped foam (C6H12.u0.394) with a density of 50 mg/cm3 are heated by X-ray radiation emitted from the hohlraum. The breakout time of the radiation wave is measured by a tri-chromatic streaked X-ray spectrometer (TCS) that consists of a set of three imaging pinholes and an array of three transmission gratings coupled with an X-ray streak camera (XSC). At one shot, the simultaneous measurements of the delay of the drive source and the radiation transport at two energies (2.0 eV, 840 eV) through the foam have been made for the first time. The experimental results indicate that the time delays vary with photon energies. With a transmission grating spectrometer (TGS), the spectra transmitting foams were measured, and the lower limit of the optical depth was measured. The radiation at energy of 2.0 eV propagates through plastic foam at a faster velocity, compared with the radiation at energy of 840 eV; while the results of copper-doped foam are reverse. The optical depth in the plastic foam is less than 1, and in the doped foam it is more than 1.

关键词： supersonic radiation wave, plastic foam, copper-doped foam, optical depth.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

ELTA-WAVE IN A SIMPLE 1-D 2.x 2.HYPERBOLIC PROBLEM

引用

Journal of computational mathematics 1996年第4期14卷 311-318页

作者： S.L. Yang(institute of applied {2., Chinese Academy of Sciences, beijing, china) institute of applied {2. Chinese Academy of Sciences Beijing China

A simple one-dimensional 2.x 2.hyperbolic system is considered in the *** model contains a linear hyperbolic equation, as well as a hyperbolic equation ofwhich the coefficients are about the solution of the linear one. The exact solution ispresented and discussed, then numerical experiments are given by TVD (or MmB)type schemes for Riemann problems. From the results, we know that the solutionsdo have δ-waves for some suitable initial data.

关键词： Zhang Figure DELTA-WAVE IN A SIMPLE 1-D 2 HYPERBOLIC PROBLEM

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

δ-WAVE FOR 1-D AND 2.D HYPERBOLIC SYSTEMS

引用

Journal of computational mathematics 1996年第3期14卷 256-262页

作者： S.L. Yang(institute of applied {2., Chinese Academy of Sciences, beijing, china) 中科院应用数学所北京

Here a new kind of nonlinear wave, which is called δ-wave, is described by some high resolution difference solutions for Riemann problems of one-dimensional (1-D) and two-dimensional (2.D) nonlinear hyperbolic systems in conservation laws. Some phenomena are numerically shown for the solutions of Riemann problems for 2.D gas dynamics systems

关键词： Zhang WAVE FOR 1-D AND 2.D HYPERBOLIC SYSTEMS

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multisymplectic Structure and Multisymplectic Scheme for the Nonlinear Ware Equation

引用

Acta Mathematicae Applicatae Sinica 2002年第1期18卷 169-176页

作者： Yu-shun WANG, Meng-zhao QINLASG, institute of Atmospheric physics, Chinese Academy of Sciences, {2. 10002., chinainstitute of computational mathematics, Academy of mathematics and System Sciences, Chinese Academy of Sciences, {2. 100080, china LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China institute of computational {2. Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing China

The multisymplectic structure of the nonlinear wave equation is derived directly from the variational principle. In the numerical aspect, we present a multisymplectic nine points scheme which is equivalent to the multisymplectic Preissman scheme. A series of numerical results are reported to illustrate the effectiveness of the scheme.

关键词： Multisymplectic structure Multisymplectic schemes Nonlinear wave equation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

TWO-SCALE FINITE ELEMENT GREEN'S FUNCTION APPROXIMATIONS WITH APPLICATIONS TO ELECTROSTATIC POTENTIAL COMPUTATION

引用

Journal of Systems Science & Complexity 2010年第1期23卷 177-193页

作者： Ying YANG Aihui ZHOU Department of computational Science and mathematics Guilin University of Electronic Technology Guilin 541004 China. The State Key laboratory of Scientific and Engineering Computing Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China.

In this paper,a two-scale finite element approach is proposed and analyzed for approximationsof Green's function in *** approach is based on a two-scale finite elementspace defined,respectively,on the whole domain with size H and on some subdomain containing singularpoints with size h (h applied to solve Poisson-Boltzmann equationssuccessfully.

关键词： Error analysis finite element Green's function Poisson-Boltzmann equation two-scale.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

BRST quantization and canonical Ward identity of the supersymmetric electromagnetic interaction system

引用

Science china(physics,Mechanics & Astronomy) 2007年第3期50卷 339-347页

作者： HUANG YongChang1,3,4, JIANG YunGuo1 & LI XinGuo2.3 1 institute of Theoretical physics, College of {2. Sciences, beijing University of Technology, beijing 10002., china 2.institute of Modern physics, Chinese Academy of Sciences, Lanzhou 730000, china 3 Center of Theoretical Nuclear physics, National laboratory of Heavy Ion Collisions, Chinese Academy of Sciences, Lanzhou 730000, china 4 china Center of Advanced Science and Technology (World laboratory), beijing 100080, china institute of Theoretical physics College of Applied Sciences Beijing University of Technology Beijing China Center of Theoretical Nuclear physics National Laboratory of Heavy Ion Collisions Chinese Academy of Sciences Lanzhou China china Center of Advanced Science and Technology (World laboratory) Beijing China institute of Modern physics Chinese Academy of Sciences Lanzhou China

According to the method of path integral quantization for the canonical constrained system in Becchi-Rouet-Stora-Tyutin scheme, the supersymmetric electromagnetic interaction system was quantized. Both the Hamiltonian of the supersymmetric electromagnetic interaction system in phase space and the quantization procedure were simplified. The BRST generator was constructed, and the BRST transforma- tions of supersymmetric fields were gotten; the effective action was calculated, and the generating functional for the Green function was achieved; also, the gauge generator was constructed, and the gauge transformation of the system was ob- tained. Finally, the Ward-Takahashi identities based on the canonical Noether theorem were calculated, and two relations between proper vertices and propaga- tors were obtained.

关键词： supersymmetric electromagnetic interaction BRST quantization Ward identity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cytotoxicity of carbon nanotubes

引用

Science china Chemistry 2008年第11期51卷 1021-1029页

作者： ZHU Ying1,2.& LI WenXin1 1 laboratory of Nano-biology and Medicine, Shanghai institute of {2. physics, Chinese Academy of Sciences, Shanghai 2.1800, china 2.Graduate School of Chinese Academy of Sciences, beijing 100049, china laboratory of Nano-biology and Medicine Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai China Graduate School of Chinese Academy of Sciences Beijing China

With large-scale production and application at large scale, carbon nanotubes (CNTs) may cause ad-verse response to the environment and human health. Thus, study on bio-effects and safety of CNTs has attracted great attention from scientists and governments worldwide. This report briefly summa-rizes the main results from the in vitro toxicity study of CNTs. The emphasis is placed on the descrip-tion of a variety of factors affecting CNTs cytotoxicity, including species of CNTs, impurities contained, lengths of CNTs, aspect ratios, chemical modification, and assaying methods of cytotoxicity. However, experimental information obtained thus far on CNTs' cytotoxicity is lacking in comparability, and some-times there is controversy about it. In order to assess more accurately the potential risks of CNTs to human health, we suggest that care should be taken for issues such as chemical modification and quantitative characterization of CNTs in cytotoxicity assessment. More importantly, studies on physical and chemical mechanisms of CNTs' cytotoxicity should be strengthened; assaying methods and evaluating criteria characterized by nanotoxicology should be gradually established.

关键词： carbon nanotubes (CNTs) cell bio-security

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Average Atom Model in Hot Plasmas

引用

原子与分子物理学报 1995年第2期12卷 118-126页

作者： Yuan Jianhui Sun Yongsheng Zheng Shaotang(institute of applied {2. and computational Mathematic beijing P. O. Box 8009 1.0088. 北京应用物理和计算数学所北京

Ａｖｅｒａｇｅ　Ａｔｏｍ　Ｍｏｄｅｌ　ｉｎ　Ｈｏｔ　ＰｌａｓｍａｓＡｖｅｒａｇｅＡｔｏｍＭｏｄｅｌｉｎＨｏｔＰｌａｓｍａｓ￥ＹｕａｎＪｉａｎｈｕｉ；ＳｕｎＹｏｎｇｓｈｅｎｇ；ＺｈｅｎｇＳｈａｏｔａｎｇ（Ｉｎｓｔｉｔｕ... 详细信息

Ａｖｅｒａｇｅ　Ａｔｏｍ　Ｍｏｄｅｌ　ｉｎ　Ｈｏｔ　ＰｌａｓｍａｓＡｖｅｒａｇｅＡｔｏｍＭｏｄｅｌｉｎＨｏｔＰｌａｓｍａｓ￥ＹｕａｎＪｉａｎｈｕｉ；ＳｕｎＹｏｎｇｓｈｅｎｇ；ＺｈｅｎｇＳｈａｏｔａｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌｉｅｄＰｈｙｓｉｃ...

关键词： Average atom Relativistic HFS model Pressure-ionization Continuum lowering

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

MD simulation of the effect of contact area and tip radius on nanoindentation

引用

Science china(physics,Mechanics & Astronomy) 2004年第1期47卷 101-112页

作者： CHEN Shangda1,2.& KE Fujiu1,2.1. Department of applied physics, {2. University of Aeronautics and Astronautics, {2. 100083, china 2. State Key laboratory of Non-linear Mechanics (LNM), institute of Mechanics, Chinese Academy of Sciences, {2. 100080, china Correspondence should be addressed to Chen Shangda (email: chensd@***) Received August 2., 2.03 Department of applied physics Beijing University of Aeronautics and Astronautics Beijing China State Key laboratory of Non-linear Mechanics (LNM) Institute of Mechanics Chinese Academy of Sciences Beijing China

Molecular dynamics simulations of nanoindentation are performed on monocrystal copper. A new contact atoms method is presented for calculating the contact area. Compared with conventional methods, this method can provide the contact area more accurately not only for sink-in but also for pile-up situation. The effect of tip radius on indentation is investigated too. The results indicate that the measured hardness of the material will become higher as the tip radius increases.

关键词： nanoindentation, molecular dynamics, contact area, zero point of penetration depth, nano- hardness.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Lie Point Symmetries of Differential-Difference Equations

引用

Communications in Theoretical physics 2004年第5期41卷 645-648页

作者： DING Wei~1 TANG Xiao-Yan~(2.3) 1 Department of applied mathematics,Shanghai Jiao Tong University,Shanghai 2.0030,{2.2.Department of physics,Shanghai Jiao Tong University,Shanghai 2.0030,{2.3 State Key laboratory of Scientific and Engineering Computing,institute of computational mathematics and Scientific Engineering Computing,Academy of mathematics and System Sciences,the Chinese Academy of Sciences,P.O.Box 2.19,beijing 100080,{2. Department of applied mathematics Shanghai Jiao Tong University Shanghai 200030 China Department of physics Shanghai Jiao Tong University Shanghai 200030 China State Key laboratory of Scientific and Engineering Computing Institute of Computational Mathematics and Scientific Engineering Computing Academy of Mathematics and System Sciences the Chinese Academy of Sciences P.O. Box 2719 Beijing 100080 China

In this paper,the classical Lie group approach is extended to find some Lie point symmetries of differential-difference *** reveals that the obtained Lie point symmetries can constitute a Kac-Moody-Virasoro algebra.

关键词： Lie point symmetry differential-difference equation Kac Moody-Virasoro algebra

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：