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On the Higher-order Nonlinear Ginzburg-Landau System in n Spatial Dimensions

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Communications in Nonlinear science and Numerical Simulation 1998年第1期3卷 15-19页

作者： Haiyang HUANG (Dept.of Math.,beijing normal university,beijing 100875,china) E mail:hhywsg@*** Depatment of Mathematics Beijing Normal University Beijing 100875 China

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ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅＧｉｎｚｂｕｒｇＬａｎｄａｕｅｑｕａｔｉｏｎｇｏｖｅｒｎｓｔｈｅｆｉｎｉｔｅａｍｐｌｉｔｕｄｅｅｖｏｌｕｔｉｏｎｏｆｉｎｓｔａｂｉｌｉｔｙｗａｖｅｓｉｎａｌａｒｇｅｖｅｒｉｔｙｏｆｄｉｓｉｐａｔｉｖｅｓｙｓｔｅｍｗｈｉ...

关键词： generalized solution global attractor Hausdorff dimension fractal dimension Ginzburg Landau equation

Complete multiple round quantum dense coding with quantum logical network

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Chinese science Bulletin 2007年第9期52卷 1162-1165页

作者： LI ChunYan1,2,LI XiHan1,2,DENG FuGuo1,2,3,ZHOU Ping1,2 & ZHOU HongYu1,2,3 1 Key Laboratory of Beam technology and Material Modification of Ministry of Education,beijing normal university,beijing 100875,china 2 Institute of Low Energy Nuclear Physics,and Department of Material science and Engineering,beijing normal university,beijing 100875,china 3 beijing Radiation Center,beijing 100875,china Key Laboratory of Beam technology and Material Modification of Ministry ofEducation Beijing Normal University Beijing 100875 China

We present a complete multiple round quantum dense coding scheme for improving the source ca-pacity of that introduced recently by Zhang et al. The receiver resorts to two qubits for storing the four local unitary ope... 详细信息

关键词：量子通信多重量子紧凑编码量子逻辑网络量子纠缠

Synthesis of superheavy nuclei with ^(238)U target

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science china(Physics,Mechanics & Astronomy) 2009年第10期52卷 1482-1488页

作者： LIU ZuHua1,3 & BAO JingDong2,4 1 Key Laboratory of Beam technology and Material Modification of Ministry of Education,beijing normal university,beijing 100875,china 2 Department of Physics,beijing normal university,beijing 100875,china 3 china Institute of Atomic Energy,beijing 102413,china 4 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000,china Key Laboratory of Beam technology and Material Modification of Ministry of Education Beijing Normal University Beijing 100875 China Department of Physics Beijing Normal University Beijing 100875 China china Institute of Atomic Energy Beijing 102413 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China

The production of superheavy nuclei with Z=108-116 via hot fusion reactions of the neutron-rich projectiles with 238U target is systematically *** results show that the production cross sections of superheavy nuclei do not decrease monotonously as the atomic number Z *** cross sections of the superheavy nuclei at Z = 112 and 115 are enhanced as compared with the whole Z-trend in synthesis of the superheavy nuclei,which clearly illustrates that the reactions with large negative Q-value and shell correction are more favorable to synthesize superheavy nuclei.

关键词： superheavy nuclei fusion reaction cross section 238U target

A new threshold signature scheme based on fuzzy biometric identity

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Progress in Natural science:Materials International 2009年第8期19卷 1021-1025页

作者： Yongquan Cai , Ke Zhang college of Computer science and technology, beijing university of technology, No. 100 Pinleyuan chaoyang, beijing 100124, china [a]college of Computer science and technology Beijing University of Technology No. 100 Pinleyuan chaoyang Beijing 100124 China

The focus of this paper is to present the first threshold signature scheme based on biometric identity, which is acquired from a recently proposed fuzzy identities-based encryption scheme. An important feature of this scheme, which is different from other previous ID-based threshold signature schemes, is that it can be applied to situations using not only average personal attributes in social contact but also people’s noisy biometric inputs as identities. The security of our scheme in the selective-ID model reduces the limit in the hardness of the Decisional BDH Assumption.

关键词： Biometric Threshold signature Identity Fuzzy

Bursting of Morris-Lecar neuronal model with current-feedback control

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science china(Technological sciences) 2009年第3期52卷 771-781页

作者： DUAN LiXia1, LU QiShao2 & CHENG DaiZhan3 1 college of science, North china university of technology, beijing 100144, china 2 School of science, beijing university of Aeronautics and Astronautics, beijing 100191, china 3 Institute of Systems science, Chinese Academy of sciences, beijing 100190, china college of science North China University of Technology Beijing 100144 China School of science Beijing University of Aeronautics and Astronautics Beijing 100191 China Institute of Systems science Chinese Academy of Sciences Beijing 100190 China

The Morris-Lecar (ML) neuronal model with current-feedback control is considered as a typical fast-slow dynamical system to study the combined influences of the reversal potential VCa of Ca2+ and the feedback current I on the generation and transition of different bursting oscillations. Two-parameter bifurcation analysis of the fast subsystem is performed in the parameter (I, VCa)-plane at first. Three important codimension-2 bifurcation points and some codimension-1 bifurcation curves are obtained which enable one to determine the parameter regions for different types of bursting. Next, we further divide the control parameter (V0, VCa)-plane into five different bursting regions, namely, the "fold/fold" bursting region R1, the "fold/Hopf" bursting region R2, the "fold/homoclinic" bursting region R3, the "subHopf/homoclinic" bursting region R4 and the "subHopf/subHopf" bursting region R5, as well as a silence region R6. Codimension-1 and -2 bifurcations are responsible for explanation of transition mechanisms between different types of bursting. The results are instructive for further understanding the dynamical behavior and mechanisms of complex firing activities and information processing in biological nervous systems.

关键词： neuron bursting bifurcation fast-slow dynamics analysis codimension

The Villin/Gelsolin/Fragmin Superfamily Proteins in Plants

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Journal of Integrative Plant Biology 2007年第8期49卷 1183-1191页

作者： Hui Su Ting Wang Huaijian Dong Haiyun Ren (Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education and college of Life sciences beijing normal university beijing 100875 china Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education and College of Life Sciences Beijing Normal University Beijing 100875 China

The villin/gelsolin/fragmin superfamily is a conserved Ca^2＋-dependent family of actin-regulating proteins that is widely present both in mammalian and non-mammalian organisms. They have traditionally been characterized by the same core of three or six tandem gelsolin subdomains. The study in vertebrates and lower eukaryotic cells has revealed that the villin/gelsolin/fragmin superfamily of proteins has versatile functions including severing, capping, nucleating or bundling actin filaments. In plants, encouraging progress has been made in this field of research in recent years. This review will summarize the identified plant homologs of villin/gelsolin/fragmin superfamily, thus providing a basis for reflection on their biochemical activities and functions in plants.

关键词： actin-binding protein actin cytoskeleton Villin/Gelsolin/Fragmin.

A distributed hydrological model with its application to the Jinghe watershed in the Yellow River Basin

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science china(Technological sciences) 2004年第z1期47卷 60-71页

作者： WANG Zhonggen1, ZHENG Hongxing1, LIU Changming1, , WU Xianfeng2 2 & ZHAO Weimin3 1. Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of Geographic science and Natural resources Research, Chinese Academy of sciences, beijing 100101, china 2. Institute of Environmental science, beijing normal university, beijing 100875, china 3. Water resources Conservation Committee of Yellow River, Zhengzhou 450003, china Chinese Acad Sci Key Lab Water Cycle & Related Land Surface Proc Inst Geog Sci & Nat Resources Res Beijing 100101 Peoples R China beijing normal Univ Inst Environm Sci Beijing 100875 Peoples R China Water resources Conservat Comm Yellow River Zhengzhou 450003 Peoples R China

For the purpose of water resources management in the Yellow River Basin with highly spatial difference, a daily distributed hydrological model was proposed, of which the determination of spatially-distributed parameters and model inputs processing were performed by means of GIS/RS. In the model, the computation of runoff yield was based on the topography index method and flow routing was modeled by Maskingum method. The operation of the model is followed by means of “command structure” technique based upon the topography of river network. A case study using the model was conducted for the Jinghe watershed, which locates at the middle Yellow River Basin. The simulation of the hydrological processes in 1996 has shown that water quantity balance errors were less than 5% and the Nash-Sutcliffe coefficient arrived at 0.7, indicating that the model structure is justifiable, and the precision of the model can satisfy the purpose of water resources management.

关键词： distributed hydrological model, structure and equation, GIS and RS, Jinghe Basin, Yellow River Basin.

Preparation and characterization of poly(vinylidene fluoride) composite membranes blended with nano-crystalline cellulose

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Progress in Natural science:Materials International 2012年第3期22卷 250-257页

作者： Haolong Bai, Xuan Wang, Yitong Zhou, Liping Zhang college of Material science and technology, beijing Forestry university, beijing 100083, china college of Material science and technology Beijing Forestry University Beijing 100083 China

Poly(vinylidene fluoride) (PVDF) composite membranes blended with nano-crystalline cellulose (NCC) for ultrafiltration were prepared by a Loeb-Sourirajan (L-S) phase inversion process. The effects of NCC concentration on the membrane performances were investigated. Surface chemical compositions, surface and cross-section morphologies, degree of crystallinity and the thermal stability of the membranes were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermal gravimetric analysis (TGA) respectively. The mechanical properties of the membranes were also investigated. All the experimental results indicated that the properties of the composite membranes were improved due to the addition of NCC. The pure water flux of composite membranes can reach 230.8 L/(m2 h) and increase up to 47.5% compared with pure PVDF membranes. At the same time, the rejection ratio of a bovine serum albumin solution (1 g/L) was up to 92.5%. The porosity and the mean pore size of the composite membranes were 65% and 49 nm, respectively. Due to the addition of NCC, the degree of crystallinity was increased to 52.1% resulting in the enhanced mechanical properties. A typical asymmetric structure, which was composed of sponge-like dense layer and finger-like microporous support layer, was observed in SEM images of composite membranes.

关键词： Poly(vinylidene fluoride) (PVDF) Nano-crystalline cellulose (NCC) Composite membranes Improved performances

Simultaneous variable selection for heteroscedastic regression models

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science china Mathematics 2011年第3期54卷 515-530页

作者： ZHANG ZhongZhan1 & WANG DaRong2 1college of Applied sciences, beijing university of technology, beijing 100124, china 2The Pilot college, beijing university of technology, beijing 101101, china 1. college of Applied sciences Beijing University of Technology Beijing 100124 China2. The Pilot College Beijing University of Technology Beijing 101101 China

In this paper, we propose a new criterion, named PICa, to simultaneously select explanatory variables in the mean model and variance model in heteroscedastic linear models based on the model structure. We show that the new criterion can select the true mean model and a correct variance model with probability tending to 1 under mild conditions. Simulation studies and a real example are presented to evaluate the new criterion, and it turns out that the proposed approach performs well.

关键词： variable selection heteroscedastic regression models adjusted profile log-likelihood AIC BIC