Applied Mechanics and Materials Vols. 182-183

Abstract: Numerical simulation about transmission enhancement phenomenon on metal film hole array has been finished in the paper by East FDTD commercial software. In some wavelengths, relative transmission rate is more than 1 and we also study that the thickness of metal plate, the size of the hole and period on influence of the transmission rate. Transmission enhancement peak lowers with the increasing of silver film thickness, enlarger along with the increasing of the aperture, And when period of hole gets larger, transmission peak will shift.

Abstract: A computation software on diffusion computation in solids was developed. The software includes two sub-modules of “database management system (DBMS)” and "Evaluation & prediction". The “DBMS” deals with the diffusion coefficients gathered from reported documents and the data evaluated according to some rules, besides, it can provide users with retrieval of diffusion coefficients. Based on the solutions to the Fick’s first law and the Fick’s second law in the four typical critical conditions, the "Evaluation & prediction" sub-module gives the predication of concentration distribution after diffusion process in solids or computation for diffusion coefficient.

Abstract: The fine numerical simulation is used to study the ground settlement of complex stratum owing to shield construction by ANSYS program. It is shown that the closer the distance between soil layer and the axis of tunnel is, the smaller the disturbance of construction is, the obvious the ground surface settlement is. The value of the maximum settlement at the center of the surface is 7.4mm. The maximum settlement of vault is 14mm. The ground subsidence in cross section distribution is shaped of normal distribution. The closer the distance between soil layer and ground surface is, the smaller the vertical displacement is, the bigger the width of settlement trough of soil layers is. The width of settlement trough is 25m. The volume loss rate of shield tunnel is about 0.32%. The width coefficient of ground settlement trough is 0.56. The tendency of ground settlement decrease to become gentle with the advance of shield construction. The ground settlement keeps constant after tunnel face advancing to 30m.

Abstract: It is found in the mine rock mass moving observation that the ground movement characteristics of mining under thick unconsolidated layers are significantly different from the thin surface mining, such as surface cracks developing into a ditch-like shape, and large spread range of subsidence[1-2]. According to incomplete statistics, the coal below constructed projects reached up to 137.64 billion tons in China [3], and strip mining as one of the important measures in “green mining technology” system has become an effective technical way [4]. This paper combined double-layer media model theory of mining under thick unconsolidated layers and the specific geological conditions, established numerical model of strip mining under thick unconsolidated layers. By employing finite element simulation software ANSYS10.0, the author of this paper studied the changes of stress and displacement in overburden rocks，learned the general laws of subsidence in surface and overburden rocks when mining under thick unconsolidated layers, and analyzed the influence that the existence of deep clay layer on development of caving fracture zone and water flowing fractured zone. The simulation results are basically consistent with experimental results, and provided theoretical guidance for the safety production practices.

Abstract: As one of the most commonly used titanium alloys, TC4 (Ti6Al4V) has an alpha–beta structure and is widely used for aircraft components. In this study, numerical simulation was conducted by using FEM software on the whole cutting process for TC4 alloy mounting parts in an effort to investigate the metal flow behavior. This study not only helps to understand but also to improve and optimize cutting process, which are based on experience combined with a trial-and-error approach.

Abstract: As developing and integrating energy consumption detection system become more and more difficult, OPC technology is used to simplify the system. The integration of system can be improved largely and the development work can be decreased through OPC standard interface. Firstly, this paper introduces relative knowledge about OPC technology, and then realizes hardware and software development of energy consumption detection system in Shenyang large-scale public buildings. The result indicates that OPC can simplify system greatly and energy consumption data can be detected at real-time.

Abstract: The paper studied the security measures of contactless IC card system. Derivation cryptographic algorithms were used in the embedded IC card system to generate multi-application cipher key, providing an effective solution for the applications with high security requirements.

Abstract: In essence, Service Oriented Architecture (SOA) is distributed and shall not have any centralized control point. Any application can access an SOA network for interaction as long as it complies with the corresponding standards. A centralized SOA architecture can also be regarded as a part of SOA. The birth and development of SOA provides a new integration technology for enterprise applications. At the same time, the IT infrastructure could provide a better service, let the enterprise, customer, partner, supplier and distributor attend commercial activity conveniently and get information what they want. In order to attain this aim, they always use integration. Through this way all business entities would be related in together, share commercial data, and complete the commercial activity together. But tradition "point-to-point" integrated method unable to satisfy the enterprise's electronic commerce demand and cause high cost and low efficiency. An integration solution based on SOA(face service construction) is put forward, which utilizes the open standard and protocol, from the global viewpoint, connect the enterprise's business process and IT infrastructure. Then a unified, standardized integration platform will be established.

Abstract: Wireless communications test set is a test instrument widely used in the field of telecommunication test, but it costs much. To satisfy the actual needs of University's practical teaching, the wireless test simulation software is designed and developed. The simulation system uses C# language for development and design. In term of technical implementation, methods such as object-oriented simulation, GDI+ and Monte Carlo methods are used to deal with the complicated design during the simulation. It realizes the simulation test process of the test set, getting the same results between simulation test results and actual test effects. In term of simulation teaching, the system provides several practical teaching and management functions by combining with the actual conditions of university. The simulation system is of strong practicality to be applied in college teaching as wireless measurement simulation teaching software.

Abstract: The maximum-entropy model is one of important methods in estimating traffic origin-destination matrix from observed traffic link flows, and it is a nonlinear integer programming model. To find the best solution, traditionally it was transformed to solve nonlinear equations by the introduction of Lagrange multiplier and Newton’s method is adopted to solve the nonlinear equations. In this paper, a entropy maximizing model to estimate the crossing origin-destination flow matrix from in-out flows is given, a genetic algorithm is proposed to solve the model and the introduction of Lagrange multiplier is avoid. A practical example showed the validity of the genetic algorithm.