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Scale-Free Properties in Traffic System

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Communications in Theoretical Physics 2006年第2X期46卷 374-380页

作者： LI ke-Ping State Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China

In this work, we propose a new model of evolution networks, which is based on the evolution of the traffic flow. In our method, the network growth does not take into account preferential attachment, and the attachment of new node is independent of the degree of nodes. Our aim is that employing the theory of evolution network, we give a further understanding about the dynamical evolution of the traffic flow. We investigate the probability distributions and scaling properties of the proposed model The simulation results indicate that in the proposed model, the distribution of the output connections can be well described by scale-free distribution. Moreover, the distribution of the connections is largely related to the traffic flow states, such as the exponential distribution （i.e., the scale-free distribution） and random distribution etc.

关键词： evolution network scale-free traffic flow

The Cathaysia Flora and the Mixed Late Permian Cathaysian-Angaran Floras in East Asia

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Journal of Integrative Plant Biology 2006年第4期48卷 381-389页

作者： ke-Qin Sun State key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of the Ministry of Education China University of Geosciences Beijing 100083 China

The Cathaysla flora, one of the most prominent floras of the Carboniferous and Permian, was mainly distributed In East Asia and was characterized by numerous endemic elements. China Is one of the most Important localities of the Cathaysla flora and It ;s also the center of origin of this flora. This paper reviews and discusses the characteristics of the Cathaysla flora and the blogeographlcally mixed Permian Cathayslan-Angaran floras of East Asia. In addition, the formative mechanism of the mixed Permian floras Is also discussed.

关键词： Cathaysia flora East Asia mixed floras Permian.

Some Combinatorial Properties of Words in Discrete Dynamical Systems from Antisymmetric Cubic Maps

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Acta Mathematica Sinica,English Series 2013年第11期29卷 2181-2192页

作者： ke Bo LU Department of Mathematics Ocean University of China

In this paper, we study the combinatorial properties ol words m chscrete dynamical systems from antisymmetric cubic maps. We also discuss the relationship of primitive kneading sequences of length n and period-doublin... 详细信息

关键词： MSS sequence MSbius inversion parity-lexicographic order

Co-oxidation of arsenic(Ⅲ) and iron(Ⅱ) ions by pressurized oxygen in acidic solutions

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 181-189页

作者： ke-zhou Song Ping-chao ke Zhi-yong Liu Zhi-hong Liu School of Metallurgy and Environment Central South University

The co-oxidation of As(Ⅲ) and Fe(Ⅱ) in acidic solutions by pressured oxygen was studied under an oxygen pressure between 0.5 and 2.0 MPa at a temperature of 150℃. It was confirmed that without Fe(Ⅱ) ions, As(Ⅲ) ions in the solutions are virtually non-oxidizable by pressured oxygen even at a temperature as high as 200℃ and an oxygen pressure up to 2.0 MPa. Fe(Ⅱ) ions in the solutions did have a catalysis effect on the oxidation of As(Ⅲ), possibly attributable to the production of such strong oxidants as hydroxyl free radicals (OH ) and Fe(Ⅳ) in the oxidation process of Fe(Ⅱ). The effects of such factors as the initial molar ratio of Fe(Ⅱ)/As(Ⅲ), initial pH value of the solution, oxygen pressure, and the addition of radical scavengers on the oxidation efficiencies of As(Ⅲ) and Fe(Ⅱ) were studied. It was found that the oxidation of As(Ⅲ) was limited in the co-oxidation process due to the accumulation of the As(Ⅲ) oxidation product, As(Ⅴ), in the solutions.

关键词： co-oxidation As As(Ⅲ)oxidation Fe(Ⅱ) pressured oxygen radical scavenger

On Factorization of Coupled Channel Scattering S Matrices

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Communications in Theoretical Physics 2007年第5X期48卷 901-907页

作者： FANG ke-Jie Department of Physics Peking University Bei jing 100871 China

We investigate the problem on how to factorize a coupled channel scattering S matrix into a product of simple S matrices. Simple S matrix solntions are found, respecting unitarity, analyticity and being real analytic.... 详细信息

关键词： ππ scattering S matrix

Introduction to the CDEX experiment

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Frontiers of physics 2013年第4期8卷 412-437页

作者： ke-Jun Kang Department of Engineering Physics Tsinghua University Beijing 100084

It is believed that weakly interacting massive particles （WIMPs） are candidates for dark matter （DM） in our universe which come from outer space and might interact with the standard model （SM） matter of our detectors on the earth. Many collaborations in the world are carrying out various experiments to directly detect DM particles. China Jinping underground Laboratory （CJPL） is the deepest underground laboratory in the world and provides a very promising environment for DM search. China Dark matter EXperiment （CDEX） is going to directly detect the WIMP flux with high sensitivity in the low WIMP-mass region. Both CJPL and CDEX have achieved a remarkable progress in recent three years. CDEX employs a point-contact germanium （PCGe） semi-conductor detector whose energy threshold is less than 300 eV. In this report we present the measurement results of muon flux, monitoring of radioactivity and radon concentration carried out in CJPL, as well describing the structure and performance of the 1 kg-PCGe detector in CDEX-1 and 10 kg- PCGe detector array in CDEX-10 including the detectors, electronics, shielding and cooling systems. Finally we discuss the physics goals of CDEX-1, CDEX-10 and the future CDEX-1T experiments.

关键词： China Dark matter EXperiment (CDEX) dark matter poit-contact germanium detector China Jinping underground Laboratory (CJPL)

Association of polymorphisms in glutathione S-transferase genes （GSTM1, GSTT1, GSTP1） with idiopathic azoospermia or oligospermia in Sichuan, China

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Asian Journal of Andrology 2015年第3期17卷 481-486页

作者： Da-ke Xiong key Laboratory of Bio-Resources and Eco-Environment Ministry of Education School of Life Science Institute of Medical Genetics Sichuan University Chengdu China Bio-resource Research and Utilization Joint key Laboratory of Sichuan and Chongqing Chengdu China Biotechnology Academy of Nanchuan Chongqing China

The reported effects of the glutathione S-transferase （GSTs） genes （GSTM1, GSTTI, and GSTP1） on male factor infertility have been inconsistent and even contradictory. Here, we conducted a case-control study to investigate the association between functionally important polymorphisms in GST genes and idiopathic male infertility. The study group consisted of 361 men with idiopathic azoospermia, 118 men with idiopathic oligospermia, and 234 age-matched healthy fertile male controls. Genomic DNA was extracted from the peripheral blood, and analyzed by polymerase chain reaction and restriction fragment length polymorphism analysis. There was a significant association between the GSTP1 variant genotype （lle/Val ＋ Val/Val） with idiopathic infertility risk （odds ratio [OR]： 1.53; 95% confidence interval [CI]： 1.11-2.11; P = 0.009）. Similarly, a higher risk of infertility was noted in individuals carrying a genotype combination of GSTTI-null and GSTP1 （lle/Val ＋ ValNal）（OR： 2.17; 95% Cl： 1.43-3.31; P = 0.0002）. These results suggest an increased risk of the GSTPI variant genotype （lle/Val ＋ Val/Val） for developing male factor infertility. Our findings also underrate the significance of the effect of GSTM1 and/or GSTT1 （especially the former） in modulating the risk of male infertility in males from Sichuan, southwest China.

关键词： genetic polymorphism glutathione S-transferase idiopathic infertility male factor

Hochschild and Cyclic (Co)homology of Superadditive Categories

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Acta Mathematica Sinica,English Series 2015年第2期31卷 201-215页

作者： De ke ZHAO School of Applied Mathematics Beijing Normal University at Zhuhai

We define the ttochschild and cyclic （co）homology groups for superadditive categories and show that these （co）homology groups are graded Morita invariants. We also show that the Hochschild and cyclic homology are ... 详细信息

关键词： K-categories superadditive categories Hochschild (co)homology cyclic (co)homology,graded Morita equivalence Kunneth formula

A Remark on Partly Dissipative Reaction Diffusion Systems on IR^n

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Acta Mathematicae Applicatae Sinica 2008年第4期24卷 583-588页

作者： Xue-ke Pu College of Maths and Physics Chongqing University Chongqing 400044 China The Graduate School of China Academy of Engineering Physics P.O. Box 2101 Beijing 100088 China Institute of Fundamental Sciences Massey University New Zealand

The long time behavior of the solutions of some partly dissipative reaction diffusion systems is studied. We prove the existence of a compact （L^2 × L^2 - H^1 × L^2） attractor for a partly dissipative reaction diffusion system in Rn. This improves a previous result obtained by A. Rodrigues-Bernal and B. Wang concerning the existence of a compact （L^2 × L^2 - L^2 × L^2） attractor for the same system.

关键词： Reaction diffusion equation attractor asymptotic compactness