Applied Mechanics and Materials Vols. 71-78

Abstract: To deal with the large amount of data and complex computing problems during high-speed image acquisition, the image acquisition and preprocess system based on FPGA is designed in the paper. In order to obtain continuous and integrity of image data streams, the design has completed the acquisition of CCD camera video signal and implementation of de-interlacing ping-pong cache. The fast median filtering algorithm is used for image preprocessing, and finally the preprocessed image data is displayed on CRT. Experiments indicate that the design meets requirements of image sample quality and balances the real-time demand.

Abstract: According to the specific geological and topographical conditions at slope of the Hydropower Station, considering the shape and size of simulation geometric model, the position relationship between the simulated area and buildings of terminal area and boundary conditions, the dynamic model which is fit to the geological structure are selected. Using the measured stress distribution as constrained conditions, 3D initial geostress field of research area are simulated using FLAC3D program. The result of simulation analysis shows that 3D initial geostress field of research area are accurately simulated based on good combination between the measured stress data and numeriacal simulation. So as to provide a reasonable basis for further condition simulation, such as excavation and unloading conditions. It has important significance for similar geological environment projects that the method is successfully applied to simulate initial geostress of this area.

Abstract: The main purpose of railway fence monitoring is to prevent people and livestock impact, cross or damage the railway fence and avoid accidents. Fiber fence technique is a new type of perimeter intrusion sensor, which was developed in the 1990s’. It has overcome many drawbacks of the traditional perimeter intrusion sensor, and realized long distance, distributed, high sensitivity, high location accuracy, low false alarm rate perimeter intrusion sensing. This article proposed a railway fence monitoring system based on BOTDR(Brillouin Optical Time Doman Reflectometer), the response time of this system is 10s, the detection range is 5km, and the location accuracy is 2m within this range.

Abstract: Using GIS technology from ecological security angle it make a quantitative analysis for expansion land ecological factor of study area urban and determine the ecological security rank distribution of urban space. It divides the urban expansion area into four types: core reserve area, buffer reserve area, limiting construct area and appropriate construct area. Respectively formulate different types of development mode and regional ecological restoration strategy.The study results showed that, ecological elements were the most important constraints for future expansion of urban space, Appropriate for the main urban expansion in the region to concentrate in the eastern and the northern part of Nanchong City, delimit a suitable construction area in the expanding area can satisfy the downtown of urban master planning development demand.This method is guaranteed to natural environment based on ecological security,Urban spatial extension to carry on the reasonable planning of the effective measures.

Abstract: In view of the water impact of environmental risk of industrial enterprises in the Three Gorges Reservoir, based on the existing methods of water environmental risk assessment and integrated the Germany detailed list assessment method; we have established a brand-new index system which could meet with the Three Gorges Reservoir water environment risk evaluation, and the system has the feature of quantitative indicators and risk classification. Site Case analysis showed that: evaluation results and the qualitative judgment are on the spot consistent with the environment Supervisory department, which demonstrated that the risk assessment system is reasonable and has easier operability. Meanwhile the system could help the enterprise and the environment Supervisory department to investigate water environment hidden danger, reduce the enterprise water environment risk effectively and provide the scientific basis for the environment Supervisory management's decision-making and the management.

Abstract: The cementing quality is directly related to the normal operation of the gas well, therefore, the evaluation of cementing quality is key to the correctly use the gas well as well as to take measures to protect the gas well. In this paper, four first wave amplitudes at the same depth point when using the borehole compensated sonic logger with double transceiver technique to carry out the acoustic amplitude log operation are served as the discriminant factors to evaluate the cementing quality. Taking the engineering actual measured data as the learning samples and using the particle swarm optimization to optimize the parameters of support vector machine, this paper established the intelligent evaluation model for cementing quality based on particle swarm optimization (PSO) and support vector machine (SVM). The model employs the excellent characteristic of SVM which has high speed of solving and could describe nonlinear relation as well as the characteristic of PSO which has global optimization. Through test of engineering samples, the research result showed that this model has fast astringency and high precision, providing a new method and approach for the fast and accurate evaluation of the well cementing quality.

Abstract: Emergency capability is the key to control the development of gas pipeline, reduce the social loss, and protect the safety of city.city gas pipeline emergency capability evaluation index system is set up. The weight of the evaluation index would be analyzed by analytic hierarchy process, and then the fuzzy comprehensive evaluation index could be calculated through the establishment of a multi-level fuzzy comprehensive evaluation matrix. At last, the estimation scale of emergency capability of gas pipeline could be obtained.

Abstract: The paper based on a foundation pit with pile-strut-anchor supporting structure in order to analyze the deformation of the pit. With the aid of finite element method the curves of relationship between horizontal displacement of pile body and depth, the relationship between horizontal displacement of soil adjacent to excavation and time were obtained. And then the law of change was summed. The maximal displacement appeared on upper part of the pile or turned up on the top but incremental displacement became small. The deformation of soil adjacent to excavation was directly related to the stage of excavation and had the characteristics of phase change. Through comparative analysis the result of finite element method simulation was in conformity with monitoring results. Therefore we can claim that this calculating model is appropriate and supporting structure is safe.

Abstract: This paper presents a FBFN-based (Fuzzy Basis Function Networks) adaptive sliding mode control algorithm for nonlinear dynamic systems. Firstly, we designed an perfect control law according to the nominal plant. However, there always exists discrepancy between nominal and actual mode, and the FBFN was applied to approximate the uncertainty. After that, the adaptive law was designed to update the parameters of FBFN to alleviate the approximating errors. Based on the theory of Lyapunov stability, the stability of the adaptive controller was given with a sufficient condition. Simulation example was also given to illustrate the effectiveness of the method.

Abstract: The issue of sustainability has been around for a long time. However, it has become a hot issue after the Earth Summit taking place in 1992 in Rio de Janeiro and in 2002 in Johannesburg. Conference in 1992 led to the formulation of Agenda 21, an action plan containing broad principles to help governments and other institutions in carrying out the policies and programs for sustainable development in their respective countries. The aim of this research was to examine the effectiveness of campus physical development planning in Malaysia in creating a sustainable living on campus by assessed the problems that exist. The study was conducted in four public university campuses and limited to only the campus physical planning. Selected campuses are the research universities campus. The case studies were conducted on each campus. The methodology used in this study is qualitative and quantitative techniques. Quantitative technique involves collecting data using questionnaires distributed among 100 respondents for each campus. Meanwhile, the qualitative technique involves collecting comments and opinions from the respondents obtained from questionnaires, behavioral observation and visual research. The results were then compared for each campus for an explanation of the problem. The findings revealed that all campuses had a similar problem. However, there are some differences about the extent or severity of the problems based on campus physical development plan that is different. The result showed that there are minimal problems occurs on the campus that planned more compact compare to a wide and dispersed campus. It also indicates that a compact campus tend to create a sustainable life on campus.