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Observation of modulated spontaneous emission of Rhodamine 6G in low refractive index contrast 1D-periodic gelatin film

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中国科学：物理学、力学、天文学英文版 2010年第1期53卷 54-58页

作者： LI Wei 1 , ZHANG XinZheng 1 , WANG ZhenHua 1 , WU Qiang 1 , LIU LongChang 1 , XU JingJun 1 & Tang BaiQuan 2 1 The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied physics school, nankai university, tianjin 300457, china 2 school of physics, nankai university, tianjin 300071, china 1. The MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Applied Physics School Nankai University Tianjin 300457 China2. School of Physics Nankai University Tianjin 300071 China

The modulation of the spontaneous emission of Rhodamine 6G has been observed in one-dimensional periodic dielectric structure of dichromated gelatin film with refractive index contrast as low as 0.01. The spontaneous emission is enhanced at the band edges and inhibits in the band gap, which agree well with the theoretical analysis on the redistribution of the fractional local density of optical states.

关键词： density of states refractive index contrast spontaneous emission

Study of D^0-D^0 mixing at a giga-Z linear collider

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Science china(physics,Mechanics & Astronomy) 2010年第11期53卷 1953-1956页

作者： LI HaiBo 1 & YANG MaoZhi 2 1 Institute of High Energy physics,P.O.Box 918,Beijing 100049,china 2 school of physics,nankai university,tianjin 300071,china Institute of High Energy physics Beijing China school of physics Nankai University Tianjin China

The possibility of studying D 0-D 0 mixing at a giga-Z linear collider "Z factory" where 10 9 hadronic Z 0 decays can be accumulated is *** discuss the sensitivity for the measurements of neutral D mixing *** results are compared to those attainable at B *** find that the typical decay length of the neutral D mesons at Z factory is about 10 times larger than that at B *** addition,the resolution of the vertex detector of a giga-Z factory is 2-3 times better than that of B *** proper time resolution at Z factory is about 20-30 times better than that at B *** the determination of the mixing parameters at a giga-Z factory is more precise.

关键词： Z factory D0 mesons mixing B factory

Micro-particle deposition and lobar distribution of mass flow in human upper respiratory tract model

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Science Bulletin 2011年第Z1期 380-385页

作者： HUANG JianHua1 & ZHANG LianZhong1,2 1 school of physics,nankai university,tianjin 300071,china 2 State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710075,china

A representative human upper respiratory tract model consisting of oropharyngeal and asymmetric tracheobronchial(TB) airways from the trachea(G0) to the main lobar bronchi(G2) was constructed. Laminar-to-turbulent airflow for typical inhalation modes as well as micro-particle transportation,wall deposition and mass flow to lobes was simulated using the CFX10.0 software from Ansys Inc. The numerical particle deposition efficiency of the oropharynx region and two generations(G1 and G2) of TB airways shows great agreement with the experimental data obtained from realistic casts. The particle deposition pattern indicates that inertial impaction is the primary mechanism in the human upper airway,and turbulence dispersion performs crescent influence especially for small particles. The initial positions of particles with different fates are confined to specifically concentrated zones. The particle mass distributions of five lobes are close to airflow distributions. The upper lobes receive fewer particles than lower lobes and the right middle lobe receives the least.

关键词： upper respiratory tract asymmetric tracheobronchial airways transportation and deposition lobar differences computational fluid dynamics simulation

Principle of limitation of physical quantities and cyclic universe

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Science china(physics,Mechanics & Astronomy) 2008年第5期51卷 451-458页

作者： HE GuoZhu Department of physics,nankai university,tianjin 300071,china 1. Department of physics Nankai University Tianjin 300071 China

A close study of Heisenberg uncertainty principles reveals many significant facts,and all four major physical quantities,energy,time,momentum and length,have both lower and upper ***,many questions come *** are these limits?Some answers may lead to the understanding of the development of our *** is the shortest limit of time?At the beginning of big bang,there exists a tre-mendously short time,the Planck *** may be just the shortest time limit in our *** longest time limit might be the lifetime of our *** longest length might be the final diameter of our expanding *** these lead to a finite *** more coupling formulae are formed for the other two pairs of physical quantities,mass and speed,thermal energy and *** four physical quantities must also have *** already knew that speed has upper limit and temperature has lower *** these two formulae,Planck and Einstein equations are derived *** most other physical quantities are somewhat related to these major physical quantities,it seems that there exists a principle of limitation of physical quantities.A quantitative sketch of big bang is *** also shows that our universe will contract back to another big *** principle of limitation opens up some fields of *** may bring nature back to the harmony and determined world described by classical physics.

关键词： principle of limitation of physical quantities limits coupling formulae cyclic universe extension of conven-tional quantum mechanics no uncertainty for physical quantities quantitative evaluation of big bang

Tunneling Through Black Rings

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Communications in Theoretical physics 2007年第5期47卷 835-842页

作者： ZHAO Liu Department of physics,nankai university,tianjin 300071,china Department of physics Nankai University

Hawking radiation of black ring solutions to 5-dimensional Einstein-Maxwell-dilaton theory is analyzedby use of the Parikh-Wilczek tunneling *** get the correct tunneling amplitude and emission rate,we adoptand develop the Angheben-Nadalini-Vanzo-Zerbini covariant approach to cover the effects of rotation and electronicdischarge all at once,and the effect of back reaction is also taken into *** constitutes a unified approach tothe tunneling *** the first law of thermodynamics for black rings holds,the emission rate is proportionalto the exponential of the change of Bekenstein-Hawking *** calculation for black ring temperatures agreesexactly with the results obtained via the classical surface gravity method and the quasi-local formalism.

关键词： black ring radiation tunneling method

FKBP23 in ER binds to BiP specifically

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Science china Chemistry 2004年第1期47卷 17-23页

作者： ZHANG Wanqi, LI Hui, ZHANG Xiaobin, SHEN Ye, WANG Yinong, Ml Huaifeng & HE BinglinState Key Laboratory of Functional Polymer Materials for Adsorption and Separation, Chemical school of nankai university, tianjin 300071, china Hygienic school of tianjin Medical university, tianjin 300071, china Medical school of nankai university, tianjin 300071, china 1. State Key Laboratory of Functional Polymer Materials for Adsorption and Separation Chemical School of Nankai University 300071 Tianjin China 2. Hygienic school of tianjin Medical university 300071 Tianjin China 3. Medical school of nankai university 300071 Tianjin China

FKBP23 was found in mouse endoplasmic reticulum (ER) in 1998. It consists of an N-terminal peptidyl-prolyl cis-trans isomerase (PPlase) domain and a C-terminal domain with Ca2+ binding sites. The fusion protein of mouse FKBP23 and glutathione S-transferase (GST), GST-FKBP23, and the fusion protein of BiP, a member of heat shock protein 70 (Hsp 70) in ER, and GST, GST-BiP, were subcloned in E. coli, expressed and purified. The fusion proteins were restrictively digested by Factor Xa (FaXa) to obtain the free cloned proteins FKBP23 and BiP. With the assay of adsorption of free FKBP23 or BiP with GST-BiP or GST-FKBP23 attached to the Glutathione-Sepharose 4B, the adsorbed FKBP23 or BiP could be detected by Immunoblot. It means that FKBP23 binds to BiP. Furthermore, BiP in leukocyte ER-extract can be adsorbed with GST-FKBP23 attached to the glutathione-Sepharose 4B. It shows that FKBP23 binds to natural BiP in ER, too. These experiments show that a PPIase binds to a molecular chaperone of the Hsp70 family.

关键词： peptidyl-prolyl cis/trans isomerase, FKBP23, BiP, endoplasmic reticulum, specific binding.

MAXIMUM INFORMATION AND OPTIMUM ESTIMATING FUNCTION

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Chinese Annals of Mathematics,Series B 2003年第3期24卷 349-358页

作者： LIN Lu Department of Statistics, school of Mathematical Sciences, nankai university, tianjin 300071, china. nankai Univ Sch Math Sci Dept Stat Tianjin 300071 Peoples R China

In order to construct estimating functions in some parametric models, this paper introducestwo classes of information matrices. Some necessary and sufficient conditions for the informationmatrices achieving their upper bounds are given. For the problem of estimating the median,some optimum estimating functions based on the information matrices are acquired. Undersome regularity conditions, an approach to carrying out the best basis function is introduced. Innonlinear regression models, an optimum estimating function based on the information matricesis obtained. Some examples are given to illustrate the results. Finally, the concept of optimumestimating function and the methods of constructing optimum estimating function are developedin more general statistical models.

关键词： Quasi (pseudo) Fisher information Estimating function Quasi score Nonlinear regression model Median regression model

On isometric extension problem between two unit spheres

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Science china Mathematics 2009年第10期52卷 2069-2083页

作者： Ding GuangGui school of Mathematical Sciences and LPMC, nankai university, tianjin 300071, china 1. school of Mathematical Sciences and LPMC Nankai University Tianjin 300071 China

In this paper we introduce the isometric extension problem of isometric mappings between two unit spheres. Some important results of the related problems are outlined and the recent progress is mentioned.

关键词： normed space isometric extension isometric mapping 1-Lipschitz mapping 46A22 46B02 46B04 46B20 46B22

Nonlinear Dynamical Behavior in BS Evolution Model Based on Small-World Network Added with Nonlinear Preference

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Communications in Theoretical physics 2007年第7期48卷 137-142页

作者： ZHANG Ying-Yue YANG Qiu-Ying CHEN Tian-Lun Department of physics,nankai university,tianjin 300071,china Department of physics Nankai University Tianjin 300071 China

We introduce a modified small-world network adding new links with nonlinearly preferential connectioninstead of adding randomly,then we apply Bak-Sneppen(BS)evolution model on this *** study severalimportant structural properties of our network such as the distribution of link-degree,the maximum link-degree,and thegth of the shortest *** further argue several dynamical characteristics of the model such as the important criticalvalue f_c,the f_0 avalanche,and the mutating condition,and find that those characteristics show panticular behaviors.

关键词： power-law behavior small-world network evolution model nonlinear preference