The motion compensation devices are often used for the movement of drill strings in deep-sea drilling operations,and the load and movement of the drill strings will greatly change while being compensated.A nonlinear dynamic analysis of drill strings was conducted.The results show that the drill strings are safe after they are compensated and that the force on compensation devices is influenced by sea water.
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The design model and implementation method of a controlfield teaching and experimental platform are introduced.The asp dynamic web page technology,database technology and the refine web computing and drawing functions of Matlab are employed to construct the simulation platform through the B/S model,simulation implemented,based on on-line system constructed with simulink.It combines experiments with interactive communication so that long-distance teaching experiments are available to multi-users.

In the field of information security，Network security vulnerability scanning is essential to the assessment of the security of the system.The Network security vulnerability is reclassified according to the relevance of the vulnerability threat.It analyses the main technology of vulnerability scanning,advances the method to develop plugin,and proposes the way to classify vulnerability plugin.The plugin structural model and designing process are given,which can achieve the targeted vulnerability scanning,making it convenient to update quickly the new scanning plugin.

In order to solve the problem of directional finiteness in wavelet transform,and reduce the redundancy of Laplacian pyramid decomposing in contourlet transform,an image fusion algorithm for regional gradient selection mean is proposed,based on the waveletbased contourlet transform(WBCT).In this algorithm,weighted mean rules are employed for low frequence while for high frequence,the regional gradient is calculated with the use of selection average rules.Evaluation of the experimental results according to objective criteria including spatial frequence,cross entropy and deviation demonstrates that the fusion algorithm based on WBCT is better than the one based on wavelet transform or contourlet transform with the same fusion rules.

In view of risk from important highway bridge operation,the three levels of dynamic monitors and earlywarning systems are given,based on the importance,scale and conditions of bridges.Different monitors and earlywarning systems are used on different bridges.At the same time different monitoring methods are employed to monitor key bridge parameters.

The genetic algorithm has the disadvantage of prematurity while the niche genetic algorithm is more timeconsuming,so the selfadaption niche technology is introduced into the genetic algorithm to format the selfadaption niche genetic algorithm,which is used to solve the problem of logistics distribution route with time window.Experimental results show that the new algorithm has better global and local search ability and higher convergence speed.It can solve the problem between the population variety and computing time,and offer a more effective way to solve the problem with the logistics distribution route.
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On the basis of the primitive information affluent coefficient model,with loose hypothesis conditions,it adopts a way to select all the information resource by combining the AHP with the expert investigation method.It constructs the evaluation indices model of resource abundance for information resource of construction firms,and gives the method which is used to measure the development scales and degrees of information resources of construction firms.The model offers reference for a bidding firm to choose a construction firm,and helps construction firms to comprehend the advantages and disadvantages of the development of information resource.

It presents the design of a kind of novel and highefficient dualband stacked microstrip patch antennas,based on cavity model theory,the technology of sloting on the surface of the patch,and multiple feed points technology..The property of the microstrip antennas has been numerically simulated using the Finite Difference Time Domain (FDTD) method.By simply tuning the size of the patch and the turningstub,and inducing the redistribution of the power of the electric field,the production of resonance in the desirable frequency can be achieved.At the same time,the upper layer which is the parasitic element of the under layer is perforated for improving the symmetry of the radiation field and the radiation efficiency.These excellent features,including the small size,the wide band,and the easy achievement of dualband circular polarization,make the design have promising prospects in the future of wireless communication.

Based on the dichotomous coordinate descent (DCD) algorithm,having the next iteration with the power of half step size after a successful iteration guarantees the convergence speed when it solves the problem with the linear equations.It makes it possible to get the ratio of two numbers without multiplication on FPGA.MATLAB simulation is carried out to verify that the DCD algorithm has higher convergence speed in the application．

The basic principles of measuring thermal expansion by Xray diffraction are reviewed.The method is compared with the conventional method,and its advantages are discussed.

It establishes a mounting system in six degrees of freedom, based on the mechanical model, and analyzes the performance of the natural characteristics and static and vibration transmission rate of the system. With MATLAB software, computer simulation and evaluation were conducted of the application of Weichai WP12.336N mounting system to King-Long 6120Y. The results indicate that the quality of the mounting system has direct influence on the delivery of the engine vibration energy and on the vehicle noise and vibration.

It mainly discusses the inverse eigenvalue problem of the antiHamiltonian matrices.The necessary and sufficient solvability conditions for the problem are given.And the general form of solutions is presented.Furthermore,the optimal approximate solution to any given matrix is studied,such a solution is proved to be unique,and the formula to compute it is provided.Some numerical examples are given to demonstrate that the results are right and the algorithm is feasible.

Mean-square stability of EulerMaruyama method is studied for scalar stochastic delay differential equations with multiplicative noise under the condition of analytical meansquare stability.It is proven that the numerical solution is meansquare stable when the stepsize satisfies certain restrictions.Numerical examples verify the theoretical results.

When Matrix  A and A~Matrix  have the same partition singular decomposition and multiplicative perturbations,the Extended Matrix Rk(A) with mother Matrix A and the Extended Matrix R~k(A~) with mother Matrix A~,the seperation between the left singular space and the right singular space is obtained by using double seperation degree.Furthermore,the perturbation bounds for the singular space of the Extended Matrix Rk(A) and its perturbation matrix R~k(A~) are studied under Frobenius norm.

An algorithm for constructing the routing of a message on the star graph is proposed.The k packets are transmitted from a source node to a destination node simultaneously along paths on the star graph network,where the ith packet traverses along the ith path (1≤i≤k).In order for all packets to arrive at the destination node quickly and securely,the ith path must be nodedisjoint from all other paths.For the construction of these paths,the Hamiltonian circuit latin square (HCLS) is employed in this algorithm,which has O(n2)of the time complexity.

Based on the thought of T-S fuzzy modeling，it deals with a class of twoplayer non-cooperative differential games via the method of T-S fuzzy modeling.It converts the model into a T-S fuzzy model which is linear locally but nonlinear overall，and obtains Nash equilibrium solution via the use of the local linear characteristics.

The problem with the stabilization of a class of nonlinear networked control systems with both time-delay and pocket-dropout is researched.A model,in which a pocket-dropout is considered as a special kind of network-induced delay and a fullorder linear observer is utilized to compensate both networkinduced delay and pocketdropout,is established through defining an augmented state vector.By constructing Lyapunov functions and employing linear matrix inequality (LMI),it derives a few sufficient conditions for such systems,and obtains the state feedback control.The given example verifies the effectiveness of the method.

An improved genetic algorithm,based on mountainclimbing operators and fitness sharing,is proposed.It combines the genetic algorithm with the local searching algorithm effectively,which enhances the searching ability of the genetic algorithm.The mountainclimbing operator,based on the method of golden section,optimizes each dimension of the individual in turn .The results show that the improved algorithm is better than some current algorithms.The new algorithm not only has a rather high convergence speed,but also locates the global optimum with a rather large probability.

Using Leray-Schauder’s topology degree theory in a nonlinear analysis,it studies Antiperiodic boundary value problems with nonlinear evolution equations associated with maximal monotone mappings in Hilbert space,and conducts further research into the results obtained.

According to the basic principles of the new discipline Extenics,it proposes the method of building the extension model and the strategy generating method of solving incompatible problems,combining ideas of ontology and intelligent agent.It uses the extension data mining method with extension set as set theoretical background to obtain the theory of extension knowledge and methods to solve contradictory  problems.Moreover,it uses the theory and methods of transformation bridge to research the strategy generating method that can be used to turn opposed problems into coexisting ones.Furthermore,it utilizes extension methods to research transformation mechanism and methods for contradictory problems and the conduction of contradictory problems as well.These researches lay the theoretical foundation for intelligent disposal systems of contradictory problems,and help to attain the goal of using computers to solve contradictory  problems for people in the end.

Experiments were carried out to investigate the absorption and reflection of electromagnetic waves (range from 50MHz to 3GHz) by plasma array panels.The results show that plasma has the features of strong absorption and weak reflection on the incident electromagnetic waves.On the scope of experimental frequencies (50 MHz to 3 GHz),plasma array panels absorb all the incident waves more or less with the values between 9.9 and 25.6 dB,but there're several absorption peaks in different frequency bands.Additionally,plasma can reflect electromagnetic waves,but the value is very low,between 0 and 3.5 dB.The results are of great significance to the construction of plasma stealth barriers.

One ammunition depot in Chengdu military region is taken as the researching object.In view of the electrostatic potential in the maintaining workshop of ammunition depots,it analyzes the characteristics of electrostatic in the workshop,designs the safety monitoring circuit for electrostatic potential in the overhauling workshop,and elaborates the technique requirements of each part in the electrostatic monitoring circuit.The purpose of monitoring electrostatic safety and giving an alarm in the overhauling workshop of ammunition depots is achieved.