Abstract:The symmetric thermochemical nonequilibrium flow is simulated numerically. The full Navier-Stokes equations are taken as the governing equations. The time-dependent analysis is used. The two-temperature and seven species gas model is adopted. NND scheme for shock capture and time preconditional metrix technique are used for numerical solution. The influence of thermochemical nonequilibrium on flow field is analysed.

Abstract:The priniciple of GPS emulator, used in emulational GPS nevigation system for UAV has been described in detail in this paper. By analyzing the basic work manner for GPS and its receiver, the relationship between WGS-84 system and other coordinates, the GPS emulator is produced. It converts the location information obtained by UAV fly simulating computer into corresponding GPS signal, which is attained by the controlling computer in UAV. The experiments show that it is qualified in simulation.

Abstract:By using the integral transform method, the problem of an infinitely long elastic strip with a Griffith crack is converted into a Cauchy-type singular integral equation in Laplace transform domain. By solving the singular integral quation and analyzing the asymptotic behavior of the crack tip field, the dynamic stress intensity factor in Laplace transform domain is gotten.

Abstract:By using Durbin's inverse Laplace transform method, the dynamic stress intensity factor in Laplace transform domain is transformed into the result in time domain. The numerical example is given and the reasonability of the method in this paper is verified. By analyzing the calculating result, some interesting and significative conclusions are presented.

Abstract:In this paper, 11-species Air Model is used for calculating the chemical non-equilibrium viscous shock layer flow over hyperboloids. The stagnation streamline distributions of pressure、temperature and N⁺₂、O⁺₂、N⁺、O⁺、NO⁺ and e^- number density are given and compared with the results of 7-species、5-species models.

Abstract:In this paper, the“equivalent airfoil flexible model”for the aerodynamic calculation and the“two body hinged model”for the flare control force calculation of a parafoil is established. The aerodynamics of the parafoil is calculated by using the nonplane-vortex-grid-method. On the basis of these calculation results, the flare control force is calculated.

Abstract:One of the most important problems in space based robotics is the disturbance to the satellite attitude caused by satellite mounted manipulators operation. In this paper the dynamic equations and conservation of angular momentum of a space manipulator system which are considered subject conditions are developed by using the“Virtual Manipulator Mode”;According to skew Matrix about skew motion of rigid body, we put out with a function to comment on the attitude change of rigid body; the we present a technique called“periods motion“to find an globally optimal path planning in form of analytic function solution.

Abstract:The output spectrum of the combustion-driven CW DF chemical lasers with different gas flow parameter is measured by the grating scanning method. Compared with the result of numerical calculation, the experimental result is analyzed.

Abstract:In the paper, the damping metal-polymer sandwich plate is prepared, and the effect of various factor of the sandwich plate is studied. Experimental results show that the loss factor is greatly influenced by the temperature and thickness of the viscoelastic layer. The armature switching is treated as damping in a relay, the vibration characteristics of the armature switching are discussed.

Abstract:Nanometer composites are prepared by hot-pressing-sintering method in the paper, using nanometer Si-C-N particles as reinforce phase, Si₃N₄ as matrix phase, the bending strength of the materials reaches 878.5MPa and the fracture toughness reaches to 11.96 MPam^1/2. The hot-pressed samples structure is characterized by scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) at the same time, the relationship between the structure and the property is discussed.

Abstract:M40J graphite fiber reinforced aluminum composite is fabricated by a vacuum liquid infiltration process and the effects of an acid phosphate binder on the properties of the fiber preform and its composite are studied in this paper. It is found that the atom ratio of Al/P in the acid phosphate, the content of the binder and the preheated temperature of the preform affect the compress property of the preform obviously. After adding 5% binder and heating it at 500℃, the preform has enough compress strength for liquid infiltration and the fiber distribute evenly in the composite. The tensile strength and the bend strength are greater than 500 MPa and 800 MPa respectively.

Abstract:In this paper, we study the theory of the electric conductivity of oils and find the electric conductivity bathtub effect throughout the radio frequency range. We advance a new method of quickly measuring moisture content and design new apparatuses to measure the moisture content of oils. They have been widely used in oil trade of China. Thus solve the difficult problem of measuring moisture content of oil.

Abstract:It is an important application for the detection and parameter estimation of LFM signal embeded in strong interference in radar signal processing. We have analyzed the characteristics of LFM signal embeded in strong interference, at the same time, the methods of detection and parameter estimation of LFM signal are summarized and compared in this paper. Subsequently, we investigated the detection performance and portray the ROC of WHT detector. Finally, we advance a method of restraining the strong interference, detecting and estimating the parameter of LFM signal based on WHT, and the experimental results are given.

Abstract:In this paper, first, the radar target scattering centers are extracted based on TLS-ESPRIT algorithm under high resolution radar in optical region, a new target recognition algorithm so-called“correlation match algorithm by scattering center situation information”is proposed. Then, the stability of this algorithm and the no-relation characteristics of correlation match coefficient and the selected base are demonstrated. Finally, the experiment results of five aircraft models are given.

Abstract:Based on the analysis of average displacement (AD) method for selection of time delay in phase space reconstruction of speech signals, this paper modifies the original measurement of AD method to get a better criterion for proper time delay selection, which has a sound theoretic basis and can produce better effect.

Abstract:In this paper, based on conventional importance analysis of FTA, we present a new importance analysis of FTA where each elementary event's probability is considered as fuzzy number after the introduction to extension principle in fuzzy mathematics. Finally, an example is given.

Abstract:This paper presents and analyses a practical phenomenon that digital processing of analogous signal brings about shaking. The cause of shaking is that some high-freguences are left over signal behind the D/A transformation filter. The formulas of amplitude shaking and phase shaking are derived. The factors which have an effect on the amplitude shaking and phase shaking are analyzed. The method to reduce shaking is given in this paper. The conclusion is of significance for designing a system of digital processing.

Abstract:With the development of computer architecture and the introduction of cache, blocking has been the main method to optimize performance in matrix computing, and the effect of leading dimension becomes important to blocking algorithms' performance. This paper analyzes this effect and how to select leading dimension to improve perofrmance, and compares this method with copy method. This method is applied to matrix multiplication and LU factorization, and the practical results agree with the theoretical analysis.

Abstract:This paper first abstracts several important parameters according to the memory reference behaviors of applications and then presents a model of processor efficiency for DSM systems. Based on the performance model this paper analyzes how the applications reference behaviors affect the processor efficiency. Several ways to improve processor efficiency are given at the end of this paper.

Abstract:Capability is an important abstract concept to specify agent A capability theory of agent computing is presented in this paper.We present the concept of plan tree to describe how agent organizes its plans effectively to fulfill its tasks and maintain conditions in the dynamic, non-deterministic multi-agent system. Based on the concept of plan tree, the formal semantics of the capability is defined and some important properties are obtained.

Abstract:The problems of possible ambiguity and non-solution in 2D、3-Station TDOA Location systems are disscussed. We find out the relation between ambiguity and the placement of stations, and the laws of the placement of nonstation and the placement of stations、the intention of measuring noice. Furthermore ,We present several solutions.

Abstract:In all kinds of quantum error-correcting scheme, five-bit quantum error-correcting codes is discussed most frequently. This paper classifies all kinds of error form with chart according to orthogonality condition, then provides a means to find all forms of five-bit quamtum error-correcting codes conveniently with direct perception and symmetry of chart.

Abstract:This paper analyses several factors that cut down the control performance of robot position control at first. Then it investigates the different effect of acceleration positive and negative feedback on these disadvantageous factors, and presents a method of integration acceleration feedback to improve the control performance of robot position. This method, which can supply the lack of the damping of the system prodigiously, is the effective approach to the high speed and high precision position control of the robot. And the effectiveness of this approach is verified by both simulation and experiments on the PUMA 560 manipulator.

Abstract:This paper analyzes the identification precision of the finite impulse response (FIR) function models of discrete-time control systems under the pseudorandom m-sequences stimulation and colored-noise disturbances. The mistake in the reference document is corrected and an explicit formula of the correlation identification precision is given in the case of colored noises. Moreover, the lower and the upper bounds of the FIR identification precision are suggested, and the conditions of reaching the bounds are obtained. Two examples are given to support the analysis.

Abstract:It is one of the important tasks of the vision system of an autonomous land vehicle (ALV) to locate itself by lane mark. In this paper, a multi-layer template correlation neural network (MTCNN) based on the pipelined image processing structure is proposed for the recognition of lane mark. A structure of the MTCNN and the training algorithm are presented. In addition, a comparison between MTCNN and MLFNN is introduced. The results of simulation manifest that the proposed MTCNN is very efficient for the task such as recognition of lane mark that is based on the pipelined image processing structure.

Abstract:This paper introduces a new theory that the concept in differential geometry of “contact”between curve and camber is applied to numbercally controlled machining sculpture surface. It puts forward the optimum contact condition for machining sculpture surface using cylindrical tool or bevel cutter with five coordinates co-operating.

Abstract:Full-automatic metric equipment can replace the traditional metric tool, Based on the combination of MCU-kernel intelligent controller and new -type packaging mechanism. The packaging metric equipment can accomplish weighing, bag-nipping, unloading and packaging automatically. This paper presents its principle, architecture and characteristics.

Abstract:To reduce the labor intensity for the environmental and building workers and improve the efficiency, the new machine is built based on the working principles of the old helix conveyor. The helix slice is changed in to flex coupling from rigid coupling, and its hard tube is changed in to soft one. After experiments, a certain technological parameters have been chosen to improve coordination between the rigid helix slice and soft tube, and to realize helix conveyor mechanism. It can convey mortar when the conveyor is somewhat curved. The research is of certain practical value and social significance. Since the technique is not complicated, it is easy to popularize.

Abstract:In this paper, we consider a higher dimensional nonautonomous almost periodic system dx/dt=f(t,x). By constructing Liapunov functions to groups of quantities of vector x, we diminish the assumption of existence of bounded solution and improve the results in the documents.

Abstract:In this paper, the financial crisis of Southeast Asia and the fundamental content, especially the job of Black and Scholes that won Nobel Prize in economics in 1997 is discussed. This paper also suggests that the research on mathema ties of finance should be carried out.