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QUANTITATIVE CHARACTERIZATION OF STRESS-STRAIN HYSTERESIS LOOPS OF Cu-Zn-Al SHAPE MEMORY ALLOY

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Acta Metallurgica Sinica(English Letters) 2001年第2期14卷 97-102页

作者： Y.F. Guo, Y.Z. Huo, C.T. Zeng, X.T. Zu (department of Metal Materials, sichuan university, chengdu 610065, china) (department of Physics, sichuan university, chengdu 610064, china) Dept. of Metal Mat. Sichuan Univ. Chengdu 610065 China

A six-parameter mathematical model was introduced to simulate the stress-strain hysteresis and the sinner hysteresis of polycrystalline shape memory alloys (SMAs). By the comparison with experiments of Cu-Zn-Al SMA, it was shown that the model could be used to calculate the stress-strain relations with rather good accuracy. Moreover, it was found that the six parameters introduced in this paper represented the characteristics of the stress-strain hysteresis of polycrystalline SMAs and could be used to characterize the hysteresis quantitatively.

关键词： Characterization Hysteresis Shape memory effect Strain Stresses Zinc alloys

Dynamic Transition and Pattern Formation in Taylor Problem

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Chinese Annals of mathematics,Series B 2010年第6期31卷 953-974页

作者： Tian MA Shouhong WANG department of mathematics Sichuan University Chengdu 610064 China department of mathematics Indiana University Bloomington IN 47405 USA.

The main objective of this article is to study both dynamic and structural transitions of the Taylor-Couette flow, by using the dynamic transition theory and geometric theory of incompressible flows developed recently by the authors. In particular, it is shown that as the Taylor number crosses the critical number, the system undergoes either a continuous or a jump dynamic transition, dictated by the sign of a computable, nondimensional parameter R. In addition, it is also shown that the new transition states have the Taylor vortex type of flow structure, which is structurally stable.

关键词： Taylor problem Couette flow Taylor vortices Dynamic transition theory Dynamic classification of phase transitions Continuous transition Jump transition Mixed transition Structural stability

Explicit Representations of Mimmal Immersions of 2-Spheres into S^(2m)

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Acta Mathematica Sinica,English Series 1997年第2期13卷 175-186页

作者： Li Xingxiao (department of mathematics,Henan Normal university,Xinxiang 453002,china)Li Anmin (department of mathematics,sichuan university,chengdu 610064,china)

For all minimal immersions of the 2-sphere S2 into the unit 2m-sphere S2mwith area 2π[m（m+1）+2],we are able to give an explicit representation by some real *** representation is rather important in the study of minimal 2-spheres in S2mbecause the parameters concerned are independent of each *** examples are given and a classification theorem is also obtained.

关键词： Minimal immersion Holomorphic curve Directrix

BOUNDED COMPOSITION OPERATORS ON HARDY SPACES (Ⅱ)

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Systems Science and Mathematical Sciences 2000年第1期13卷 67-73页

作者： CAO Guang fu ZHONG Chang yong (department of mathematics, sichuan university, chengdu 610064, china) 四川大学数学系四川成都 610064 四川大学数学系四川成都

***",***.,***.(S.)=1,HP(B.)***:B.--+Baisananalyticmap,foranyfEHP(B.),***... 详细信息

***",***.,***.(S.)=1,HP(B.)***:B.--+Baisananalyticmap,foranyfEHP(B.),***...

关键词： Hardy space Hp-extension property composition operator.

Studying　the　Mode－Spectra　Characteristics　of　An　Above－Threshold　Biased　Semiconductor　Laser

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Chinese Journal of Lasers 1994年第1期B3卷 11-16页

作者： XIA Guangqiong WU Zhengmao CHEN Jianguo LU Yucun(Optoelectronics department, sichuan university,chengdu 610064, china) sichuan Univ Chengdu China

ＳｔｕｄｙｉｎｇｔｈｅＭｏｄｅ－ＳｐｅｃｔｒａＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＡｎＡｂｏｖｅ－ＴｈｒｅｓｈｏｌｄＢｉａｓｅｄＳｅｍｉｃｏｎｄｕｃｔｏｒＬａｓｅｒ￥ＸＩＡＧｕａｎｇｑｉｏｎｇ；ＷＵＺｈｅｎｇｍａｏ；Ｃ... 详细信息

ＳｔｕｄｙｉｎｇｔｈｅＭｏｄｅ－ＳｐｅｃｔｒａＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＡｎＡｂｏｖｅ－ＴｈｒｅｓｈｏｌｄＢｉａｓｅｄＳｅｍｉｃｏｎｄｕｃｔｏｒＬａｓｅｒ￥ＸＩＡＧｕａｎｇｑｉｏｎｇ；ＷＵＺｈｅｎｇｍａｏ；ＣＨＥＮＪｉａｎｇｕｏ；ＬＵＹｕｃｕ...

关键词： semiconductor laser ray trace method mode suppression ratio carrier density

Theoretical study on the hydrolysis mechanism of N,N-dimethyl-N′-(2′,3′-dideoxy-3′-thiacytidine)formamidine

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Science china Chemistry 2008年第10期51卷 911-917页

作者： ZHANG Chang1 & XUE Ying2? 1 College of Chemistry and Environment Protection Engineering, Southwest university for Nationalities, chengdu 610041, china 2 College of Chemistry, sichuan university, chengdu 610064, china 1. College of Chemistry and Environment Protection Engineering Southwest University for Nationalities Chengdu 610041 China 2. College of Chemistry Sichuan University Chengdu 610064 China

The hydrolysis mechanisms of N,N-dimethyl-N′-(2′,3′-dideoxy-3′-thiacytidine)formamidine (FA-3TC) in the gas phase and in aqueous solution were studied by use of the density functional theory B3LYP/6-31+G(d, p) method. Two possible reaction pathways in the title reaction were considered. In one pathway water attacks the C=N double bond first (path A) while in the other water attacks the C—N single bond first (path B). The calculated results indicate that the first step in both pathways is the rate-limiting process and path A is more favorable than path B in the gas phase. The effect of solvent water on the title reaction was assessed at the B3LYP/6-31+G(d, p) level of theory based on the po-larizable continuum model (CPCM). In water the first mechanism (path A) is also favored.

关键词： N N-dimethyl-N′-(2′ 3′-dideoxy-3′-thiacytidine)formamidine hydrolysis solvent effect B3LYP polarizable continuum model

Nonlinear Analysis on Vertical Distribution of Suspended Load

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Communications in Nonlinear Science and Numerical Simulation 1998年第2期3卷 19-23页

作者： Fuquan WANG, Houqiang LI and Jing DING (sichuan Union university,chengdu,610064,china) sichuan Union university Chengdu 610064 China

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｓｔｕｄｉｅｓｏｎｖｅｒｔｉｃａｌｄｉｓｔｒｉｂｕｔｉｏｎｏｆｓｅｄｉｍｅｎｔｉｎｎａｔｕｒａｌｒｉｖｅｒｓｈａｖｅｉｍｐｏｒｔａｎｔｔｈｅｏｒｅｔｉｃａｌｍｅａｎｉｎｇｓａｎｄｅｎｇ... 详细信息

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｓｔｕｄｉｅｓｏｎｖｅｒｔｉｃａｌｄｉｓｔｒｉｂｕｔｉｏｎｏｆｓｅｄｉｍｅｎｔｉｎｎａｔｕｒａｌｒｉｖｅｒｓｈａｖｅｉｍｐｏｒｔａｎｔｔｈｅｏｒｅｔｉｃａｌｍｅａｎｉｎｇｓａｎｄｅｎｇｉｎｅｒｉｎｇａｐｐｌｉｃａｔｉｏ...

关键词： turbulence fractal sediment vertical distribution

LOW ORDER NONCONFORMING RECTANGULAR FINITE ELEMENT METHODS FOR DARCY-STOKES PROBLEMS

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Journal of Computational mathematics 2009年第Z1期 400-424页

作者： Shiquan Zhang School of mathematics,sichuan university,chengdu 610064,china Xiaoping Xie Yangtze Center of mathematics and School of mathematics,sichuan university,chengdu 610064,china Yumei Chen School of mathematics,sichuan university,chengdu 610064,china College of mathematics and Information,china West Normal university,Nanchong 637002,china

In this paper,we consider lower order rectangular finite element methods for the sin-gularly perturbed Stokes *** model problem reduces to a linear Stokes problemwhen the perturbation parameter is large and degenerates to a mixed formulation of Pois-son’s equation as the perturbation parameter tends to *** propose two 2D andtwo 3D nonconforming rectangular finite elements,and derive robust discretization *** experiments are carried out to verify the theoretical results.

关键词： Darcy-Stokes problem Finite element Uniformly stable

On Incomplete Gaussian Sums

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Acta Mathematica Sinica,English Series 1996年第2期12卷 141-150页

作者： Liu Chunlei Liu Chunlei department of mathematics Peking university Beijing,100871 chinaCurrent Address:department of mathematics sichuan university chengdu,610064 china

In this paper it is proved that sum from N=N+1 to N+H x（n）ψ（n）（?）ε H1-（1/r）q(（1/4（r-）1）+ε, where r=4,q is a prime power,χ and ψ are multiplicative and additive characters modulo q respectively,with χ... 详细信息

关键词： Multiplicative characters