检索结果-南通市图书馆

物理学报 1997年第9期46卷 1801-1807页

作者：董正超淮阴师范学院物理系

运用量子统计的格林函数方法研究磁三明治结构中的巨磁阻效应，推出一个既适用于厚膜又适用于薄膜的电导统一公式，讨论经典理论与量子理论间的联系和过渡．

关键词：磁多层结构巨磁阻效应量子解析厚膜薄膜

Synthesis of N-(2-Hydroxy-1-Phenoxyacetyl)Prolyproline

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 1998年第2期3卷 217-220页

作者： Yang Dingqiao(department of Chemistry,Huanggang teachers college, Huanggang City, Hubei 436100,china)Grace B Borowitz,Irving J Borowitz(department of Chemistry,Ramapo college of New Jersey, Mahwah,NJ 07430,USA) Huanggang teachers college Department of Chemistry Huanggang City Hubei China Ramapo college of New Jersey Department of Chemistry Mahwah USA (GRID:grid.418922.4) (ISNI:0000 0001 2108 5881)

Ionophores consist of molecules which surround and carry positive metal ions and other ions through biological membranes. One classe of ionophores which we have been developing contains dipeptides which are encouraged to become part of a ring because of possible hydrogen bond formation between the 2-hydroxy on the phenyl group and carboxyl group (COOH) of the final amide proline. Formation of a ring should increase the complexation ability of the ionophore. We report that the synthesis of N-(2-hydroxyl-1-phenoxyacetyl) prolyproline(1), a novel ionophore is prepared from activated 2-acetoxy phenoxyacetic acid (3a) and the appropriate dipeptide ester using coupling methods such as dicyclohexyl carbodiimide with hydroxyben-ztriazole or carbonyl diimidazole.

关键词： synthesis ionophore dipeptide

Colored Noise in First-order-like Phase Transition of a Laser System

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 2002年第2期11卷 21-26页

作者： HE Ying ZHU Shiqun LING Yinsheng( department of physics, college of Sciences, Suzhou University,Suzhou 215006, china) department of physics College of Sciences Suzhou University Suzhou 215006

The decoupling theory is employed to analyze the multiplicative colored noise in a single mode laser system. Steady state intensity distribution function is derived when colored noise is included in the laser system. The first-order-like phase transition driven by multiplicative colored noise is investigated and compared with the case of multiplicative white noise. It is shown that the noise correlation time can affect the parameter plane of the first-order-like phase transition. The steady state intensity distributions in a laser system is changed greatly with noise correlation time τ.

关键词： first-order-like phase transition multiplicative colored noise noise correlation time

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

阶梯透射光栅衍射效率的研究

中国激光 2003年第7期30卷 601-604页

作者：张耀举温州师范学院物理与电子信息科学系浙江温州325027

阐述了标量近似与Snell定律和Fresnel关系相结合的方法,并推导出阶梯透射光栅的衍射场强分布和衍射效率公式。以四阶梯透射光栅为例,详细分析计算了衍射效率及其影响因素。研究表明所得结果优于纯标量近似的结果。该方法避免了完全矢量... 详细信息

阐述了标量近似与Snell定律和Fresnel关系相结合的方法,并推导出阶梯透射光栅的衍射场强分布和衍射效率公式。以四阶梯透射光栅为例,详细分析计算了衍射效率及其影响因素。研究表明所得结果优于纯标量近似的结果。该方法避免了完全矢量波理论的麻烦,克服了标量近似的不足,特别适宜于研究周期大于4λ的光栅的衍射。对周期小于4λ的光栅,本方法的使用受到了限制。

关键词：物理光学衍射效率标量近似阶梯光栅

A generalized Weyl-Wigner quantization scheme unifying P-Q and Q-P ordering and Weyl ordering of operators

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2012年第6期21卷 207-212页

作者：王继锁范洪义孟祥国 Shandong Provincial Key Laboratory of Laser Polarization and Information Technology College of Physics and EngineeringQufu Normal University department of physics Liaocheng University department of physics Shanghai Jiao Tong University

By extending the usual Wigner operator to the s-parameterized one as 1/4π2 integral （dyduexp [iu（q-Q）＋iy（p-P）＋is/2yu]） from n=- ∞ to ∞ with s beng a,real parameter,we propose a generalized Weyl quantization scheme which accompanies a new generalized s-parameterized ordering *** rule recovers P-Q ordering,Q-P ordering,and Weyl ordering of operators in s = 1,1,0 *** it differs from the Cahill-Glaubers’ ordering rule which unifies normal ordering,antinormal ordering,and Weyl *** also show that in this scheme the s-parameter plays the role of correlation between two quadratures Q and *** formula that can rearrange a given operator into its new s-parameterized ordering is presented.

关键词： generalized Wigner operator generalized operator ordering rule bivariate normal dis-tribution

钕玻璃片状激光放大器自发辐射放大特性的研究

在线全文

学校读者我要写书评

暂无评论

物理学报 2000年第6期49卷 1047-1051页

作者：张华范滇元南通师范学院物理系南通226007 中国科学院上海光学精密机械研究所上海201800

编制了一套用蒙特卡罗方法计算钕玻璃片状放大器内自发辐射放大 (ASE)的模拟计算程序 ,考虑了光线在两大表面不同入射角对反射率的影响 .计算了包边吸收的ASE能量沿周边的分布 ,以便于对放大器热畸变特性的研究 ;

关键词：钕玻璃片状激光放大器自发辐射放大

A relative local variational principle for topological pressure

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2010年第6期53卷 1491-1506页

作者： MA XianFeng1,CHEN ErCai2,3,& ZHANG AiHua2,4 1department of Mathematics,East china University of Science and Technology,Shanghai 200237,china 2School of Mathematics and Computer Science,Nanjing Normal University,Nanjing 210097,china 3Center of Nonlinear Science,Nanjing University,Nanjing 210093,china 4college of Mathematics and physics,Nanjing University of Posts and Telecommunications,Nanjing 210046,china 1. department of Mathematics East China University of Science and Technology Shanghai 200237 China2. School of Mathematics and Computer Science Nanjing Normal University Nanjing 210097 China3. Center of Nonlinear Science Nanjing University Nanjing 210093 China4. College of Mathematics and Physics Nanjing University of Posts and Telecommunications Nanjing 210046 China

We define the relative local topological pressure for any given factor map and open cover,and prove the relative local variational principle of this *** precisely,for a given factor map π:(X,T)→(Y,S) between two topological dynamical systems,an open cover U of X,a continuous,real-valued function f on X and an S-invariant measure ν on Y,we show that the corresponding relative local pressure P(T,f,U,y) satisfies sup μ∈M(X,T){ hμ(T,U|Y)+∫X f(x)dμ(x) :πμ=ν}=∫Y P(T,f,U,y)dν(y),where M(X,T) denotes the family of all T-invariant measures on ***,the supremum can be attained by a T-invariant measure.

关键词： pressure conditional entropy relative local variational principle

Description of Hypernucleus _(ΛΛ)~6He by the ΛΛ_α Model

在线全文

学校读者我要写书评

暂无评论

Chinese journal of nuclear physics 1994年第1期16卷 21-25页

作者： Li Chuliang Duan Yiwu (department of physics.Xiangtan Normal college.Xiangtan 411100) 湘潭师范学院物理系湖南湘潭 411100 湘潭师范学院物理系湖南湘潭

Based on the ΛΛα model,a variational calculation for the double-Λhypernucleus ΛΛ6He is carried out with the harmonic oscillator *** thevarious Λ-Λ interactions proposed,the Gaussian type with or without repulsive core *** influence on eigenenergy,structure and interparticle correlation is studiedby observing the shape-density.

关键词： Hypernucleus Harmonic oscillator Repulsive core

Synthesis and Properties of New-type Troponoid Dithio-Crown Ethers

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2000年第6期11卷 499-502页

作者： Li Jun TANG Long Yi JIN Bing Zhu YIN (department of Chemistry, Jinzhou teachers college, Jinzhou 121000)(department of Chemistry, Yanbian University, Yanji 133002) Jinzhou teachers Coll Dept Chem Jinzhou 121000 Peoples R China Yanbian Univ Dept Chem Yanji 133002 Peoples R China

Condensation of 3,7-dichloromethyl-5-isopropyl-2-methoxytropane 4 with bis (mercaptoethyl) ether 5a and mono, di, and tri-ethylene glycol bis(mercaptoethyl) ethers 5b-5d gave troponoid-annexed dithiocrown ethers 6a-6d... 详细信息

关键词： tropone crown ether complex reversible

Synthesis of Macrocyclic Arsinous Acid Esters

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1999年第12期10卷 0-0页

作者： Xin You CHENI Ying Qin YANG Wen Tian TAO(1’department of Chemistry, Xiaogan teachers college, Hubei 432100)(2department of Chemistry, Xinyang teachers college, Henan 464000)(3department of Chemistry, Wuhan University, Wuhan 430072) Xiaogan teachers Coll Dept Chem Hubei 432100 Peoples R China Xinyang teachers Coll Dept Chem Henan 464000 Peoples R China Wuhan Univ Dept Chem Wuhan 430072 Peoples R China

The reactions of the his (dimethylamino) alkylarsine with dids lead to the formations ofmacrocyclic arsinous acid esters. The synthesis of title compounds was described and theirslructures were characterized by elemen... 详细信息

关键词： Bis (dimethylamino) alkylarsine macrocyclic arsinous acid ester synthesis.