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Indoor Thermal Environment of Korean Rural Housing Yanbian Region of china in Winter

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湖南大学学报（自然科学版） 2009年第S1期36卷 163-166页

作者： WANG Xiu-ping1,JIN Hong2,WANG Yi-han1(1.School of Art and Design,Zhejiang Sci-Tech University,Hangzhou,Zhejiang 310018,china 2.School of Architecture,Harbin Institute of Technology,Harbin,Heilongjiang 150001,china) School of Art and Design Zhejiang Sci.-Tech. University Hangzhou 310018 China School of Architecture Harbin Institute of Technology Harbin 150001 China

For the rural housing in Yanbian region in winter,the indoor thermal environment is bad but the energy consumption is *** in order to solve the problem,the life particularities of the local residents,such as the inhabitation custom and the different living ways,were *** comfortable temperature felt by the local residents was surveyed and summarized according to different age's *** subjective comfortable temperature was calculated by using the thermal comfort formula set up by *** result shows that the comfortable temperature between the survey and the calculation is *** analyzing the survey and the result calculations,the range of local indoor comfortable temperature was given,which provides a reference basis for calculating the thermal comfort and energy efficiency as well as designing green rural houses.

关键词： green rural house thermal comfort environment indoor comfortable temperature energy efficiency

Large-deviation probabilities for maxima of sums of subexponential random variables with application to finite-time ruin probabilities

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Science china Mathematics 2008年第7期51卷 1257-1265页

作者： JIANG Tao School of Finance,Zhejiang Gongshang University,Hangzhou 310018,china 1. School of Finance Zhejiang Gongshang University Hangzhou 310018 China

We establish an asymptotic relation for the large-deviation probabilities of the maxima of sums of subexponential random variables centered by multiples of order statistics of *** uniform random *** extends a corresponding result of *** an application,we generalize a result of Tang,the uniform asymptotic estimate for the finite-time ruin probability,to the whole strongly subexponential class.

关键词： large-deviation probability strongly subexponential distribution finite-time ruin probability the compound Poisson model uniform asymptotics 91B30 60G70 62P05

(s,t,d)-bi-Koszul algebras

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Science china Mathematics 2009年第11期52卷 2419-2431页

作者： SI JunRu Department of Mathematics,Hangzhou Dianzi University,Hangzhou 310018,china 1. Department of Mathematics Hangzhou Dianzi University Hangzhou 310018 China

The paper focuses on the 1-generated positively graded algebras with non-pure resolutions and mainly discusses a new kind of algebras called(s,t,d)-bi-Koszul algebras as the generalization of bi-Koszul algebras. An(s,t,d)-bi-Koszul algebra can be obtained from two periodic algebras with pure resolutions. The generation of the Koszul dual of an(s,t,d)-bi-Koszul algebra is discussed. Based on it,the notion of strongly(s,t,d)-bi-Koszul algebras is raised and their homological properties are further discussed.

关键词： bi-Koszul algebra periodic algebra pure resolution 16E05 16E40 16S37 16W50

L_p-mixed intersection bodies

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Science china Mathematics 2008年第12期51卷 2172-2188页

作者： ZHAO ChangJian Department of Information and Mathematics Sciences, College of Science, china Jiliang University, Hangzhou 310018, china Department of Information and Mathematics Sciences College of Science China Jiliang University Hangzhou 310018 China

In this paper the author first introduce a new concept of Lp-dual mixed volumes of star bodies which extends the classical dual mixed volumes. Moreover, we extend the notions of Lp- intersection body to Lp-mixed intersection body. Inequalities for Lp-dual mixed volumes of Lp-mixed intersection bodies are established and the results established here provide new estimates for these type of inequalities.

关键词： L p -dual mixed volumes L p -intersection bodies L p -mixed intersection bodies 52A40

Lp-dual Quermassintegral sums

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Science china Mathematics 2007年第9期50卷 1347-1360页

作者： Chang-jian ZHAO Department of Information and Mathematics Sciences,College of Science,china Jiliang University,Hangzhou 310018,china 1. Department of Information and Mathematics Sciences College of Science China Jiliang University Hangzhou 310018 China

In this paper,we first introduce a concept of L_p-dual Quermassintegral sum function of convex bodies and establish the polar projection Minkowski inequality and the polar projection Aleksandrov-Fenchel inequality for L_p-dual Quermassintegral ***,by using Lutwak’s width-integral of index i,we establish the L_p-Brunn-Minkowski inequality for the polar mixed projec- tion *** applications,we prove some interrelated results.

关键词： mixed volumes mixed projection bodies dual Quermassintegral sum polar of mixed projection bodies 52A40 53A15

Effective generalized equations of secure hyperelliptic curve digital signature algorithms

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The Journal of china Universities of Posts and Telecommunications 2010年第2期17卷 100-108,115页

作者： YOU Lin ,SANG Yong-xuan College of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310018,china [a] College of Communication Engineering Hangzhou Dianzi University Hangzhou 310018 China

A hyperelliptic curve digital signature algorithm （HECDSA） can be viewed as the hyperelliptic curve analogue of the standard digital signature algorithm （DSA）. This article discusses divisor evaluations, the basic HECDSA, variants, two HECDSA equations and a 4-tuple HECDSA scheme, and puts forward a generalized equation for HECDSA. From this generalized equation, seven general HECDSA types are derived based on the efficiency requirements. Meanwhile, the securities of these general HECDSA types are analyzed in detail.

关键词： hyperelliptic curve digital signature algorithm generalized equation hyperelliptic curve discrete logarithm problem

Mean size formula of wavelet subdivision tree on Heisenberg group

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Applied Mathematics(A Journal of Chinese Universities) 2008年第3期23卷 303-312页

作者： WANG Guo-mao Department of Mathematics,Zhejiang University,Hangzhou 310027,china Department of Mathematics,Hangzhou Dianzi University,Hangzhou 310018,china. Department of Mathematics Zhejiang University Hangzhou 310027 China Department of Mathematics Hangzhou Dianzi University Hangzhou 310018 China

The purpose of this paper is to investigate the mean size formula of wavelet packets （wavelet subdivision tree） on Heisenberg group. The formula is given in terms of the p-norm joint spectral radius. The vector refinement equations on Heisenberg group and the subdivision tree on the Heisenberg group are discussed. The mean size formula of wavelet packets can be used to describe the asymptotic behavior of norm of the subdivision tree.

关键词： Heisenberg group wavelet packets subdivision tree joint spectral radius stability

EVOLUTION OF NUMBER CONCENTRATION OF NANO-PARTICLES UNDERGOING BROWNIAN COAGULATION IN THE TRANSITION REGIME

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Journal of Hydrodynamics 2011年第4期23卷 416-421页

作者： WANG Yu-ming LIN Jian-zhong Institute of Fluid Measurement and Simulation China Jiliang University Hangzhou 310018 China china Jiliang University Hangzhou 310018 China State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

Evolution of number concentration of nanoparticles undergoing Brownian coagulation in the transition regime is studied theoretically and numerically. The results show that the curves of particle size distribution move toward the area with large particle diameters, the curve peak becomes lower and the range that particle diameters cover becomes wider as time elapses. In the process of coagulation the particles with small diameter disappear gradually and the particle size distribution remains a log-normal distribution. The change rate of the particle size distribution is more appreciable at the initial stage than that at the final stage. The initial Knudsen number has a significant effect on the coagulation rate which increases with decreasing the initial Knudsen number. The larger the initial geometric standard deviation is, the smaller the curve peak is, and the wider the area that curves cover is. The initial geometric standard deviation has a significant effect on the particle size distribution which can remain a self-preserving state when the initial geometric standard deviation is smaller than 2. With the increase of the diversity of initial particle size, the particle size distribution does not obey the log-normal distribution any more as time elapses.

关键词： nanoparticles Brownian coagulation number concentration numerical simulation

Impact Factors of Energy Productivity in china: An Empirical Analysis

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Chinese Journal of Population,Resources and Environment 2007年第2期5卷 28-33页

作者： Wei Chu1,2, Shen Manhong2 1. College of Economics and Management, Zhejiang Sci-Tech University, Hangzhou Zhejiang 310018, china 2. College of Economics, Zhejiang University, Hangzhou Zhejiang 310017, china College of Economics and Management Zhejiang Sci-Tech University Zhejiang 310018 Hangzhou China College of Economics Zhejiang University Zhejiang 310017 Hangzhou China

This article developed a decomposition model of energy productivity on the basis of the economic growth model. Four factors were considered which may influence china’s energy productivity according to this model: technology improvement, resource allocation structure, industrial structure and institute arrangement. Then, an econometric model was employed to test the four factors empirically on the basis of china’s statistical data from 1978 to 2004. Results indicated that capital deepening con- tributes the most (207%) to energy efficiency improvement, and impact from labor forces (13%) is the weakest one in resource factor; industrial structure (7%) and institute innovation (9.5%) positively improve the energy productivity.

关键词： energy productivity impact factor economic growth china