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Some variational principles in electroelastic media under finite deformation

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science china(Physics,Mechanics & Astronomy) 2008年第9期51卷 1390-1402页

作者： KUANG ZhenBang department of engineering Mechanics,shanghai jiaotong university,shanghai 200240,china department of engineering Mechanics Shanghai Jiaotong University Shanghai China

It is proposed that the universal thermodynamic energy variational principle is in-cluded in the first law of thermodynamics. Some variational principles in the elec-troelastic media under finite deformation are derived from this universal thermo-dynamic variational principle. It is suggested that in the general electroelastic analysis the environment should be considered together with the discussed elec-troelastic medium. For the variational principle of nonlinear electroelastic media the variation of the electric potential is coupled with the virtual displacement,and the variation of the initial volume should be considered. The Maxwell stress in the initial configuration is naturally derived from this variational principle and it is unique in the second order precision.

关键词： first law of thermodynamics variational principle the electroelastic media the governing equation

NUMERICAL SIMULATION OF MORPHOLOGY OF POLYMER CHAIN COILS IN COMPLEX FLOWS

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Chinese Journal of Polymer science 2005年第5期23卷 453-462页

作者： Hong Zheng Wei Yu Chi-xing Zhou department of Polymer Materials science & engineering,shanghai jiaotong university,shanghai 200240,china department of Polymer Materials science & engineering Shanghai Jiaotong University Shanghai 200240 China

A new coupled finite element formulation is proposed to calculate a conformation tensor model in two complex flows： a planar contraction flow and a planar flow around a symmetrically placed cylinder. The components of conformation tensor are first computed together with the velocity and pressure to describe the change of morphology of polymer chain coils in flow fields. Macroscopic quantities of viscoelastic flow are then calculated based on the conformation tensor. Comparisons between the numerical simulations and experiments for stress patterns and velocity profiles are carried out to prove the validity of the method.

关键词： Viscoelastic flow Morphology Complex flows Conformation tensor model Finite element method (FEM).

Sorption of a triazol derivative by soils: importance of surface acidity

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Journal of Environmental sciences 2003年第3期15卷 383-387页

作者： WU De-yi (School of Environmental science and engineering, shanghai jiaotong university, shanghai 200240, china.) School of Environmental science and engineering Shanghai Jiaotong University 上海 200240

The sorption of a triazol derivative, 1-(4-chlorophenyl)- 4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)penten-3-ol with a common name of S3307D, on fifteen soils and three H_2O_2-treated soils was investigated. The sorption isotherm for each untreated and treated soil was non-linear, and was best fitted to Freundlich sorption equation. Soils containing high amount of clay content or organic matter or both sorbed much higher amounts of the chemical than soils that had low contents of these soil constituents. H_2O_2-treated soils showed considerable sorptive affinity for S3307D. It was concluded that both organic matter and mineral fraction in natural soils contributed to the sorption of the basic compound. Sorption by the H_2O_2 treated soils increased as suspension pH decreased, but all suspension pHs exceeded the pKa of the compound by more than two units. This implies that organic base protonation can occur on surfaces of soil components, and surface acidity (exchangeable acidity ) is important in sorption process of the organic base rather than suspension pH.

关键词： sorption organic base soil surface acidity

External Equality and Absolute Equality Coincide in Finite CCS and π Calculus Without Summation

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Journal of shanghai jiaotong university(science) 2011年第5期16卷 533-537页

作者：金云 department of computer science and engineering Shanghai Jiaotong University

External equality and absolute equality are defined model independently by Fu. It is interesting and important to know whether these two equalities coincide or not. There are some results in Fu's paper for this issue. It is relatively easy to prove the coincidence if the summation operator is in the language, otherwise it is harder. In fact Fu proposed it as an open problem whether the two equalities coincide in some languages without summation. In this paper, the proofs of the coincidence in finite CCS and π calculus without summation are given.

关键词： CCS calculus π calculus absolute equality external equality coincidence

Tissue P systems with parallel rules on channels

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Progress in Natural science:Materials International 2007年第4期17卷 486-491页

作者： Xu Xian (department of computer science and Technology, shanghai Jiao Tong university, shanghai 200240, china) department of computer science and Technology Shanghai Jiaotong University Shanghai 200240 China

A new variant of P systems as an improvement of the original design is introduced. The P systems here allow parallelism in rules application on synapses (or links, channels), rendering the systems more efficient. We describe the execution mechanism of our P systems, make analysis on its computation power, and illustrate the running by an example.

关键词： tissue P systems parallel rules.

A NONLINEAR THERMOCAPILLARY MIGRATION OF DROPLETS DUE TO DEPENDENCE OF PHYSICAL PROPERTIES ON TEMPERATURE

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Journal of Hydrodynamics 2006年第4期18卷 469-474页

作者： SUN Ren department of engineering Mechanics Shanghai Jiaotong University Shanghai 200240 China

A slow thermocapillary migration of a droplet at vanishingly small Reynolds and Marangoni numbers was theoretically investigated. A force on the droplet released in another liquid subjected to arbitrary configuration of the gravitational field and an imposed thermal gradient for the case of constant liquid properties was derived using the general solutions given by Lamb. A solution to the migration was thereby obtained, which corresponds to the well-known YGB result as t →∞. In the case of variable physical properties with temperature, a nonlinear migration of the droplet was described by the dynamical equation of motion, and the numerical results were compared with available experimental data. The comparison exhibits a reasonable agreement between the theoretical prediction and the experimental results, which shows the dependence of physical properties on temperature is a primary cause of the continuous velocity variation in the thermocapillary droplet migration.

关键词： thermocapillary migration droplet/bubble dynamics interfacial tension thermal gradient

An improved approach to the efficient construction of and search operations in motion graphs

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science china(Information sciences) 2012年第5期55卷 1042-1051页

作者： GAO Yan 1,CHEN ZhiHua 2,CHEN MinGang 3 & SHEN Yang 3 1 Software engineering Institute,East china Normal university,shanghai 200062,china 2 department of computer science and engineering,East china university of science and Technology,shanghai 200237,china 3 department of computer science and engineering,shanghai Jiao Tong university,shanghai 200240,china Software engineering Institute East China Normal University Shanghai China department of computer science and engineering East China University of Science and Technology Shanghai China department of computer science and engineering Shanghai Jiao Tong University Shanghai China

Motion graphs have been widely used as an effective technique in the synthesis of human *** synthesize well-formed motions,motion graphs require smooth transitions and good ***,the time and costs grow quadratically as the graph size *** this paper,we present a method to set up a hierarchical structure,called a structure *** coarse level of this graph models different motion categories and their transitions,and the fine level mainly captures different motion *** interpolation space method is used to improve the graph connectivity at the fine *** structure guides the establishment of a faster and more realistic graphical *** the building process,this structure also helps with searching the motion graph,by performing a traverse search and placing the findings into a direct look-up table or local search ***,when there is no direct link between the different motions,a navigation map is introduced to conduct an appropriate search path via a series of transition motion *** experimental results indicate that our approach could lower the computation time in construction and searching,while simultaneously providing a richer variety of motion styles.

关键词： motion graph structure table registration curve motion interpolation

On Sequential Composition of Precise Zero-Knowledge

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Journal of shanghai jiaotong university(science) 2010年第1期15卷 43-48页

作者：丁宁谷大武 department of computer science and engineering Shanghai Jiaotong University

Precise zero-knowledge was introduced by Micali and Pass in STOC'*** notion captures the idea that the view of any verifier in interaction can be reconstructed in almost *** also obtained a sequential composition lemma for precise zero-knowledge ***,this lemma doesn't provide tight precisions for composed *** this paper we further obtain a sequential composition lemma for a subclass of precise zero-knowledge protocols,which all satisfy a property:their simulators use the code of verifier in almost the black-box *** call such subclass emulated black-box zero-knowledge *** lemma provides better precisions for sequential composition of such protocols.

关键词： cryptography zero-knowledge precise zero-knowledge

Identity based signature scheme based on cubic residues

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science china(Information sciences) 2011年第10期54卷 2001-2012页

作者： XING DongSheng,CAO ZhenFu & DONG XiaoLei department of computer science and engineering,shanghai Jiao Tong university,shanghai 200240,china department of computer science and engineering Shanghai Jiao Tong University Shanghai China

We propose a novel method to compute a cubic root of a cubic residue in Eisenstein *** applying our method,a new identity based signature scheme is proposed based on cubic *** formally prove that our scheme is secure against existential forgery on the adaptive chosen message and identity attacks assuming the hardness of *** scheme is the first identity based signature scheme based on cubic residues.

关键词： Eisenstein ring identity based signature cubic residue factoring random oracle proven security