Showing papers by "Shanghai University published in 1995"
TL;DR: This work details the implementation of the integral global minimization algorithms and illustrates the flexibility and the efficiency of integral global optimization method by presenting the performance of algorithms on a collection of well known test problems in global optimization literature.
Abstract: The theoretical foundation of integral global optimization has become widely known and well accepted [4],[24],[25]. However, more effort is needed to demonstrate the effectiveness of the integral global optimization algorithms. In this work we detail the implementation of the integral global minimization algorithms. We describe how the integral global optimization method handles nonconvex unconstrained or box constrained, constrained or discrete minimization problems. We illustrate the flexibility and the efficiency of integral global optimization method by presenting the performance of algorithms on a collection of well known test problems in global optimization literature. We provide the software which solves these test problems and other minimization problems. The performance of the computations demonstrates that the integral global algorithms are not only extremely flexible and reliable but also very efficient.
49 citations
Journal Article•
TL;DR: The results suggest that the antitumor mechanism of ABP may be related to potentiation of the host immunosurveillance mechanism and the changes in cell membrane features.
Abstract: Achyranthes bidentata polysaccharides (ABP), extracted from the root of Achyranthes bidentata Blume, 25-100mg.kg-1.d-1 x 7 could inhibit tumor growth by 31%-40%. Combination of cyclophosphamide (Cy) and ABP increased the rate of tumor growth inhibition to 58%. ABP 50 and 100% mg/kg ip could potentiate LAK cell activity and increase the Con A (5 micrograms/ml)-induced production of tumor necrosis factor (TNF-beta) from murine splenocytes. The optimal time for TNF production was on d 8. We also found that ABP 1-2 micrograms/ml strongly inhibited the proliferation of S180 and K562 cells in vitro. The S180 cell membrane content of sialic acid was increased and phospholipid decreased after ABP acting on cells for 24 hours. The changes were significantly different from the control group (P < 0.05 or P < 0.01), but the membrane cholesterol content and membrane mobility indices (Ch/PI) were not affected. The results suggest that the antitumor mechanism of ABP may be related to potentiation of the host immunosurveillance mechanism and the changes in cell membrane features.
21 citations
TL;DR: In this paper, the authors examined seven pioneering higher-technology joint ventures in Shanghai and found that each has a Western partner and has achieved success by designing, realizing and maintaining a delicate venture-level equilibrium within a dynamic macroenvironment.
20 citations
TL;DR: In this article, an EHL approach to the rib-roller end contact in tapered roller bearings was achieved by taking into account the non-Newtonian behavior of lubricants and thermal effects and with full consideration of the peculiar geometrical and kinematic conditions.
Abstract: An EHL approach to the rib-roller end contact in tapered roller bearings has been achieved by taking into account the non-Newtonian behavior of lubricants and thermal effects and with full consideration of the peculiar geometrical and kinematic conditions. Two kinds of geometrical configurations of rib and roller end were investigated: tapered rib/spherical roller end and spherical rib/spherical roller end. Optimal ratios of curvature radius of roller end to rib face were deduced. The film thickness, friction torque, lubricant temperature, and surface temperature at various speeds and loads were calculated.
18 citations
TL;DR: In this article, a review of research advances in China in inverse and hybrid problems for aerodynamic design of turbomachine bladings is presented, including mainly: image-space approach and variational approach; improved mean-streamline/mean-stream-surface methods; inverse problem of unsteady aerodynamics: possible problem-posing and VAE formulation.
Abstract: A brief review of research advances in China in inverse and hybrid problems for aerodynamic design of turbomachine bladings is presented, including mainly: 1) two original approaches – image-space approach and variational approach; 2) improved mean-streamline/mean-stream-surface methods; 3) inverse problem of unsteady aerodynamics: possible problem-posing and variational formulation.
11 citations
TL;DR: In this paper, the kinetics of the nucleation and growth of PbO 2 during the potentiostatic oxidation in a lead anodic film was studied using linear sweep voltammetry, potential-step and ac impedance tracing methods.
7 citations
TL;DR: In this article, a unified variable-domain variational theory of hybrid problems for rotor-flow is extended to fully 3D transonic rotor-flows with shocks, unifying and generalizing the direct and inverse problems.
Abstract: Based on [3], the unified variable-domain variational theory of hybrid problems for rotor-flow [1], [2], [16], [24] is extended to fully 3-D transonic rotor-flows with shocks, unifying and generalizing the direct and inverse problems. Three variational principle (VP) families together with a general form of generalized VPs have been established, taking distributed suction and/or blowing along blade- and annular walls into account. All unknown boundaries are successfully handled via functional variations with variable domain, converting almost all boundary and interface conditions, including the Rankine-Hugoniot shock relations, into natural ones. This theory provides a series of novel ways for blade design and a theoretical basis for finite element applications and also constitutes an important part of the optimal design theory of rotor-bladings [6]. Numerical solutions by finite elements in [22]–[24] show good agreement with experimental results.
6 citations
TL;DR: A lead-barium-aluminum phosphate glass has been prepared by a wet chemical process as mentioned in this paper, which exhibits high transmission in the visible region of the spectrum and into the mid-infrared and can strongly absorb in the ultraviolet at wavelengths of less than 344 nm.
Abstract: A lead-barium-aluminum phosphate glass has been prepared by a wet chemical process. The phosphate glass exhibits high transmission in the visible region of the spectrum and into the mid-infrared and can strongly absorb in the ultraviolet at wavelengths of less than 344 nm. In addition, the glass has a relatively high index of refraction and a good chemical durability. Therefore, the phosphate glass can be used for general-purpose optical applications.
5 citations
TL;DR: By the improvement of Riks' and Crisfield's arc-length method, the adaptive parameter incremental method is prensted for predicting the snapping response of structures and its justification is fulfilled.
Abstract: By the improvement of Riks' and Crisfield's arc-length method, the adaptive parameter incremental method is prensted for predicting the snapping response of structures. Its justification is fulfilled. Finally, the effectiveness of this method is demonstrated by solving the snapping response of spherical caps subjected to centrally distributed pressures.
5 citations
TL;DR: In this paper, the authors prove that the turbulence closure problem is caused by lack of statistical distribution in present turbulence theory, and the restriction of turbulence model theory and the shortcoming of direct numerical simulation of N-S to solve the turbulence have been pointed out.
Abstract: It is a wrong viewpoint that the turbulence closure problem is due to the non-linearity of N-S equation, because if we omit the non-linear terms in N-S equation, many physical quantities can not be obtained other than the mean-values. In this paper, we proof that the closure problem of turbulence be induced by lack of statistical distribution in present turbulence theory. And the restriction of turbulence model theory and shortcoming of direct numerical simulation of N-S to solve the turbulence have been pointed out.
5 citations
TL;DR: Based on the general theory of elastic plates which abandons Kirchhoff-love assumption in the classical theory, this article established a first order approximation theory for elastic circular plates with non-Kirchhoff Love assumption, and presented an analytic solution to the axisymmetric problem of elastic circular plate with clamped boundary under uniformly distributed load.
Abstract: Based on the general theory of elastic plates which abandons Kirchhoff-Love assumption in the classical theory, this paper establishes a first order approximation theory of elastic circular plates with non-Kirchhoff-Love assumption, and presents an analytic solution to the axisymmetric problem of elastic circular plates with clamped boundary under uniformly distributed load. By comparing with the classical solution of the thin circular plates, it is verified that the new solution is closer to the experiment results than the classical solution. By virtue of the new theory, the influence of the diameter-to-thickness ratio upon the precision of the classical theory is examined.
TL;DR: In this article, a new scheme for FMS production planning and dispatching under the realistic assumptions promoted by a particular flexible manufacturing factory is presented, and the simulation results indicate that the scheme provides a good production plan, according to the short-term plans from the MIS Department.
Abstract: The speedy development and extensive application of computers have helped play a significant role in a new technological revolution. The importance of FMS flexibility in producing a variety of products and adapting rapidly to customer requirements makes FMSs attractive. Further, FMSs are most appropriate for largevariety and medium- to high-volume production environments. However, the module of the FMS production planning system is not perfect. This paper focuses on a new scheme for FMS production planning and dispatching under the realistic assumptions promoted by a particular flexible manufacturing factory. Some practical constraints such as fixture uniqueness, limited tool magazine capacity, and a given number of pallets are considered. The simulation results indicate that the scheme provides a good production plan, according to the short-term plans from the MIS Department. Some conclusions are drawn and a discussion is presented.
TL;DR: In this article, the wave function of a free electron in a laser plasma described via Riemannian geometry is derived by solving the Dirac equation in the associated curved space-time.
Abstract: The wave function of a free electron in a laser plasma described via Riemannian geometry is derived by solving the Dirac equation in the associated curved space-time. If the laser field vanishes, the wave function naturally reduces to the case in flat space-time.
TL;DR: In this paper, high electrical conductive BaRuO 3 thin films with (110) perovskite orientation have been successfully fabricated on Si(100) substrates by pulsed ArF excimer laser deposition and post-annealing.
TL;DR: In this article, the ground state is quantized in the path integral formulation and the functional partition function and the method proposed by Fradkin is used to obtain the correct absolute value squared of ground state.
Abstract: The Maxwell-Chern-Simons system as a constrained system is quantized in the path integral formulation. Using the functional partition function and the method proposed by Fradkin, we obtain the correct absolute value squared of the ground state.
TL;DR: In this article, a physical model has been established based on the discussion of properties of the turbulent coherent structure for smooth boundary layer, and the width of slowly-moving streak line and bursting time of coherent structure expressed by momentum thickness Reynolds number of boundary layer have been obtained, which are in agreement with the experimental data.
Abstract: In this paper, based on the discussion of properties of the turbulent coherent structure for smooth boundary layer, a physical model has been established. The width of slowly-moving streak line and bursting time of coherent structure expressed by momentum thickness Reynolds number of boundary layer have been obtained, which are in agreement with the experimental data[3,4,5,7]
TL;DR: In this paper, the behavior of a charged particle in a strong-laser plasma is discussed by solving the generally covariant equation of motion for a charge particle, and the classical description for the radiation of the charged particle and the intensity and the radiation power are derived in detail.
Abstract: The behavior of a charged particle in a strong-laser plasma is discussed by solving the generally covariant equation of motion for a charged particle. The classical description for the radiation of a charged particle in a strong-laser plasma is given, and the intensity and the radiation power are derived in detail.
TL;DR: The classical small deflection theory of elastic plates is based on the Kirchhoff-love assumptions as mentioned in this paper, which are used on the basis of the thinness of plate and the smallness of deflection.
Abstract: The classical small deflection theory of elastic plates is based on the Kirchhoff-Love assumptions[1,2]. They are used on the basis of the thinness of plate and the smallness of deflection. In terms of Cartesian tensor coordinatex xi(i=0, 1, 2), these basic assumptions are:
(1)
the transversal normal strain may be neglected, i.e., e00=01
(2)
the transversal shear strain may be neglected, i.e., e0a=0 (x=1, 2):
(3)
the transversal normal stress may be neglected, i.e., σ00=0
TL;DR: In this article, the authors attempt to treat both strong twisting and slight twisting of fiber via a consistent asymptotic approach to the coupled-mode theory, and derive an admirably simple and useful equation in the form R2τ = const, which relates the minimum required twist rate τ with the minimum allowable radius of curvature R.
Abstract: In this article, the authors attempt to treat both strong twisting and slight twisting of fiber via a consistent asymptotic approach to the coupled-mode theory. In strong twisting, an admirably simple and useful asymptotic equation is derived in the form R2τ = const., which relates the minimum required twist rate τ with the minimum allowable radius of curvature R. In slight twisting, an oscillatory pattern of the polarization behavior clearly reveals the advantageous feature of a twist-spun fiber, which is made by a prior spinning of the fiber before a twisting. © 1995 John Wiley & Sons, Inc.
04 Oct 1995
TL;DR: In this article, a milli-gripper using a piezoelectric actuator and flexible hinge structure is presented, and the effect of the force charged on the actuator is considered.
Abstract: The authors describe their research aimed at promoting milli-mechanism technology. Several integrated mill-gripper prototypes have been made. In the first part of this paper, we present the design of a milli-gripper using a piezoelectric actuator and flexible hinge structure. The character of stacked piezoelectric actuator and the structure of milli-gripper is analyzed. The effect of the force charged on piezoelectric actuator is also considered. A new method is described for calculating the output of flexible hinge structure using piezoelectric actuator. In the second part, another milli-gripper prototype, using electro-magnetic force and a wedge-shaped mechanism, is presented.
TL;DR: In this paper, a model of general process in laser systems is described and it is shown that a three-level laser system can generate nonclassical light with sub-Poissonian distribution, where as the four-level system generates light essentially Poisson distributed at threshold.
TL;DR: In this article, the second-order approximation theory of thin elastic plates and its boundary conditions were established by applying the stationary condition of variations of a functional for this problem based on the generalized variational principle.
Abstract: The first order approximation theory of three dimensional elastic plates and its boundary conditions presented in the previous paper[1] establishes six differential equations for the solutions of six undetermined functions uo, ua, A(o) and S(2)a defined in the x, y plane. They can be divided into two groups, each constitutes three equations to calculate uo, S(2)a and ua, A(o) respectively. Their boundary conditions as well as these equations are derived from the stationary conditions of variations of a functional for this problem based on the generalized variational principle. The solutions given by this theory are close to those given by the classical theory of thin plates as the ratio of thickness h to width a is small. For large ratio, say h/a=0.3 a considerable difference arises between the two theories. It has not been made clear that in what range of the ratio such difference is reasonable to give more precise solutions. In order, to solve this problem, we must study the second order approximation theory. In this paper following the previous one, we shall establish the second order approximation theory by applying the, stationary condition of variations of a functional for this problem based on the generalized variational principle, to derive nine differential equations and the relate boundary conditions, which are used to calculate nine undetermined functions uo ua, A(o), A(1), S(2)a and S(3)a. And the range of the validity of the first order approximation theory can be found out by comparing the second order theory with the first order theory and the classical theory. It should be pointed out here that the equations of, the second order theory can also be divided into two groups to be solved separately, and the procedure of solution is not too complicate to perform as well. Here, we will use the same notations adopted in the previous paper, and not repeat their definitions.
TL;DR: Based on the asymptotical perturbation method and the Galerkin technique, the hybrid changeable basis GBS is presented for predicting the nonlinear response of structures as mentioned in this paper, which greatly reduces calculation and is easily used in other numerical discretization techniques, such as finite element method etc.
Abstract: Based on the asymptotical perturbation method and the Galerkin technique, the hybrid changeable basis Galerkin technique is presented for predicting the nonlinear response of structures. By the idea of changeable basis functions first proposed, it greatly reduces calculation and is easily used in other numerical discretization techniques, such as finite element method etc. It appears to have high potential for solution of nonlinear structural problems. Finally, the effectiveness of this technique is demostrated by means of two numerical examples: the large deflection of circular plates objected to uniform normal load and the large deflection of spherical caps under centrally distributed pressures.
TL;DR: The various kinds of real time control methods based on transputers are investigated and some practical real time Control techniques are proposed according to the properties of the transputer and the capability of Occam programming.
Abstract: An important application of modern microcomputer systems is in the area of real time control. The transputer is a novel RISC microcomputer that provides a few of the facilities which may be obtained in a general microcomputer. The various kinds of real time control methods based on transputers are investigated. Some practical real time control techniques are proposed according to the properties of the transputer and the capability of Occam programming. The outlines of Occam code for the various real time control applications are given.
TL;DR: In this article, a general solution for the stress and displacement of curve cracks distributing along a parabolic curve in an infinite homogeneous anisotropic medium subjected to uniform loading at infinity has been given by using the Stroh's formalism and mapping method.
Abstract: «A general solutions for the stress and displacement of curve cracks distributing along a parabolic curve Ω in an infinite homogeneous anisotropic medium subjected to uniform loading at infinity have been given in this» paper by using the Stroh's formalism and the mapping method. The solutions are valid not only for plane problems but also for antiplane problems and the problems whose inplane and antiplane deformations couple each other. A closed form solution for the stress and displacement in the entire domain is obtained for one curve crack or two curve cracks along the parabolic curve. The simple explicit form solution for the stress intensity factors and the crack opening displacement are presented.
TL;DR: In this paper, the higher-order asymptotic solution to the Cauchy problem of a nonlinear wave equation is found by using a computer algebra-perturbation method.
Abstract: In this paper, the higher-order asymptotic solution to the Cauchy problem of a nonlinear wave equation is found by using a computer algebra-perturbation method The secular terms in the solution from straightforward expansions are eliminated with the straining of characteristic, coordinates and the use of the renormalization technique, and the four-term uniformly valid solution is obtained with the symbolic computation by using a computer algebra system The comparison of the derived asymptotic solution and the numerical solution shows that they coincide with each other for smaller e and agree quite well for larger e (e g, e=025)
TL;DR: In this article, the parametric equations and the formulas of unit normal vector and surface element for a parabolic torus reflector antenna are derived and the mechanism of producing multibeam is proposed.
Abstract: The parametric equations and the formulas of unit normal vector and surface element for a parabolic torus reflector antenna are derived and the mechanism of producing multibeam is proposed, Based on physical optics, the radiation pattern formulas for the antenna are given, with which the effects of geometric parameters on the antenna are studied. The good agreement between the calculated patterns and the measured ones shows that the theory is helpful for designing parabolic torus antennas.
TL;DR: In this paper, the fracture process of a TiAl alloy with fully lamellar microstructure is present, which allows the formation of bridging and shear ligaments resulting in a relatively high toughness.
Abstract: The fracture process of a TiAl alloy with fully lamellar microstructure is present, which allows the formation of bridging and shear ligaments resulting in a relatively high toughness. The formation of the ligaments, which experience extensive deformation between the crack faces as the crack extends, appears to be attributable to the ability of the lamellae to locally deform. However, the plastic incompatibility strains are still obvious. Further research is needed to understand the mechanism on the concurrent plastic incompatibility and local ductility in the fully lamellar microstructure.
TL;DR: Wei-Zang as discussed by the authors extended the principle of maximum power losses for the incompressible viscous fluid proposed by professor Chien Wei-zang to the hydrodynamic problems of a special class of non-Newtonian fluid.
Abstract: In this paper, the principle of maximum power losses for the incompressible viscous fluid proposed by professor Chien Wei-zang is extended to the hydrodynamic problems of a special class of non-Newtonian fluid—generalized Newtonian fluid. The constraint conditions of variation are eliminated by the method of identified Lagrangian multipliers and a generalized variational principle is established.
24 Jul 1995
TL;DR: Variably coupled-mode theory developed decades ago in the microwave art is rediscovered to be a powerful mathematical tool in dealing with highly irregular fiber optics, whose analytic solution would have been extremely difficult to obtain if adopting a regular optical method.
Abstract: Variably coupled-mode theory developed decades ago in the microwave art is rediscovered to be a powerful mathematical tool in dealing with highly irregular fiber optics, whose analytic solution would have been extremely difficult to obtain if adopting a regular optical method. Examples treated in this presentation are the author's new invention of a set of fiber-optic analogues of bulk-optic wave plates. Experimental data exactly confirm theoretical predictions.