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	1. THE RE-EXPLORATION OF THE SPATIAL OSCILLATIONS IN FINITE DIFFERENCE SOLUTIONS FOR NAVIER-STOKES SHOCKS
	Ran Zheng
	Mechanics 28 October 2005
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	Abstract:Through the preliminary numerical calculations, we gained confidence on the use of the NNDschemes, the principle of choice of the coefficients of the third order derivatives is still based on the linearized conclusion. Under the unsteady, nonlinear conditions, the validate is an open question. Symmeries could help us to reach a new conlusion, which domenstrated that the linearized conclusion is met with the similarity inavirants, but not for the Galileo invariants in general case. In this paper, the spatial oscillations in finite difference solutions for Navier-Stokes shocks are re-explored from a point view of group-invariance theory. It is shown that the oscillations of numerical solutions in the upstream and downstream regions of shock have link with the symmetry broken. The symmetry inherent necessary conditions must be satisfied for the choice of finite difference schemes.
	TO cite this article:Ran Zheng. THE RE-EXPLORATION OF THE SPATIAL OSCILLATIONS IN FINITE DIFFERENCE SOLUTIONS FOR NAVIER-STOKES SHOCKS[OL].[28 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3401


	2. On Symmetries of 1D Lattice-Boltzmann Equation
	Ran Zheng
	Mechanics 27 October 2005
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	Abstract:The Galilean and similarity invariance inherent in Navier-Stokes equations are not really recovered in one dimensional lattice Boltzmann equation, especially for shock calculation. Qian’s theoretical development recovering Navier-Stokes equations in LBE is questionable.
	TO cite this article:Ran Zheng. On Symmetries of 1D Lattice-Boltzmann Equation[OL].[27 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3394

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	3. On Galilean Invariance of 1D Lattice-Boltzmann Equation
	Ran Zheng
	Mechanics 18 October 2005
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	Abstract:The Galilean invariance is not really recovered in one dimensional lattice Boltzmann equation, especially for shock calculation. Qian’s theoretical development recovering Navier-Stokes equations in LBE is questionable.
	TO cite this article:Ran Zheng. On Galilean Invariance of 1D Lattice-Boltzmann Equation[OL].[18 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3284


	4. The study of the fatigue crack propagation threshold based on the maximum stress intensity factor
	Meng Zhaoxin,Zhang Jiazhen
	Mechanics 29 September 2005
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	Abstract:In situ SEM observations have revealed that fatigue crack propagation is caused by the shear band decohesion around the crack tip and the formation and cracking of the shear band is mainly caused by the plasticity generated in the loading part of a load cycle. Based on the crack tip plasticity a theoretical analysis has been performed and a model has been set up to consider the effect of the applied stress ratio on fatigue crack propagation threshold. The obtained results have been compared with published test data and good agreement has been achieved. This method is very easy to use and no fatigue crack closure measurement is needed, therefore this model is significant in engineering application.
	TO cite this article:Meng Zhaoxin,Zhang Jiazhen. The study of the fatigue crack propagation threshold based on the maximum stress intensity factor[OL].[29 September 2005] http://en.paper.edu.cn/en_releasepaper/content/3073


	5. Dynamics of large scales in isotropic turbulence
	Ran Zheng
	Mechanics 23 September 2005
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	Abstract:Some physically significant consequences of recent advances in the theory of self-preserved homogenous statistical solutions of the Navier-Stokes equations are presented. Integral lengthscales based on the solutions are discussed, and used to derive rigorously a new recursion equation, which would be help to understand the dynamics of turbulence, especially for the cascade. The energy spectrum and its behavior in the lowest wave number range are discussed. Previous two different theory (the Batchelor spectra, the Saffman spectra) could be unified by using present theory. According to the present theory, the Loitsianskii’s integral invariant is not an invariant in general case.
	TO cite this article:Ran Zheng. Dynamics of large scales in isotropic turbulence[OL].[23 September 2005] http://en.paper.edu.cn/en_releasepaper/content/2988


	6. All-Fiber Modulator Using Two-Channel Surface Acoustic Wave Device
	Zhao Luming,Zhao Qida,Mu Guoguang
	Mechanics 11 May 2005
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	Abstract:The interaction of multi-channel acoustic waves with an optical wave in fiber is studied. A new type of 2-channel surface acoustic wave (SAW) all-fiber acousto-optic modulator is constructed. The theoretical analysis is supported by the experimental results.
	TO cite this article:Zhao Luming,Zhao Qida,Mu Guoguang. All-Fiber Modulator Using Two-Channel Surface Acoustic Wave Device[OL].[11 May 2005] http://en.paper.edu.cn/en_releasepaper/content/2015


	7. Analysis of Flow Field Asymmetry and Forces Acted on a Centrifugal Pump by a 3-D Numerical Simulation
	Si HUANG
	Mechanics 18 April 2005
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	Abstract:A three-dimensional turbulent flow through entire a single-stage centrifugal pump is numerically simulated using FLUENT software. The analysis is completed in a multiple reference frame. The standard k-e turbulence models is applied. It is found obviously in the simulation that flow field is asymmetric, i.e., flow speed and pressure field are total different among all channels in the impeller, causing unbalance of hydrodynamic load on impeller blades. Axial- and radial-directional forces generated by such unbalance acted on the pump are calculated as well. The results indicate that radial-directional force due to asymmetry of flow field is significant and probably affects stability of pump working. The current computation is verified by comparing predicted and measured head.
	TO cite this article:Si HUANG. Analysis of Flow Field Asymmetry and Forces Acted on a Centrifugal Pump by a 3-D Numerical Simulation[OL].[18 April 2005] http://en.paper.edu.cn/en_releasepaper/content/1881


	8. Theoretical Derivation of The Rational Slope Curve for The Oval-shaped Deep Open Pits
	YUE Shuyu,ZHANG Shixiong,REN Gaofeng
	Mechanics 14 March 2005
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	Abstract:The mechanical analysis of the oval-shaped deep open pit slope is presented in this paper. Based on the theory of elasticity, the circumference stresses at the edge of the oval-shaped open pit caused by the deadweight of the rock and the horizontal virgin stress are derived. Then considering the critical sliding conditions of the infinitesimal element, the first order differential equation, which defined the relations between the depth and the radius of curvature of the slope, is obtained. Through the particular case study, it is found that the slope curve function obtained theoretically is rational.
	TO cite this article:YUE Shuyu,ZHANG Shixiong,REN Gaofeng. Theoretical Derivation of The Rational Slope Curve for The Oval-shaped Deep Open Pits[OL].[14 March 2005] http://en.paper.edu.cn/en_releasepaper/content/1688


	9. Hydration Heat, Shrinkage and Deformation Under Sustained Loads of HSS Columns Filled with Self-Consolidating Concrete
	Han Lin-Hai,Yang You-Fu,Li Yong-Jin
	Mechanics 24 February 2005
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	Abstract:n recent years, the possibility of using hollow structural steel (HSS) columns filled with self-consolidating concrete (SCC) in practical engineering, has been the interests of structural engineers. However, the composite members are susceptible to the characteristics of temperature field due to cement hydration heat, the shrinkage of core concrete and the deformations subjected to long-term loading. The temperature field during cement hydration, and the shrinkage of the concrete core in self-consolidating concrete (SCC)-filled hollow structural steel (HSS) tubes (SCCHSS) are experimentally studied in this paper. The main parameters are sectional dimensions and sectional types. The observed results illustrate that the characteristics of the temperature field in SCCHSS tubes is similar to that of normal concrete members. However, the shrinkage value of the concrete core in SCCHSS tubes is significantly smaller than that of normal concrete. Based on the measured results, shrinkage mode
	TO cite this article:Han Lin-Hai,Yang You-Fu,Li Yong-Jin. Hydration Heat, Shrinkage and Deformation Under Sustained Loads of HSS Columns Filled with Self-Consolidating Concrete[OL].[24 February 2005] http://en.paper.edu.cn/en_releasepaper/content/1585


	10. Effect of Nanoroughness on Wall Slip of a Squeezed Fluid Film
	Sun Hongxin,Wu Chengwei
	Mechanics 18 January 2005
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	Abstract:Wall slip for a fluid flowing near a randomly nanorough surface can be described by a hydrodynamic equation subjected to wall slip control equations. The problem is solved using a surface limiting shear stress model and complementary algorithm. It is found that, for the roughness effect on the hydrodynamic force of two approaching surfaces, definition of zero separation of rough surfaces is very important. Different definitions of the zero separation may give rise to different conclusions in both the cases of slip and no-slip. The theoretical predictions are compared with the experimental observations for both smooth surfaces and rough surfaces. For smooth surface, a very good agreement exists between theory and experiment. For rough surfaces, it is found that roughness increases the boundary slip if the zero separation is defined at the roughness peaks. This agrees with the experimental observation by Bonaccurso, Butt and Craig (Phys. Rev. Lett. 2003, 90(14), 144501).
	TO cite this article:Sun Hongxin,Wu Chengwei. Effect of Nanoroughness on Wall Slip of a Squeezed Fluid Film[OL].[18 January 2005] http://en.paper.edu.cn/en_releasepaper/content/1474

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