Advanced Materials Research Vols. 443-444

Abstract: The woven fabric with curved surfaces is a kind of single layer woven fabrics, which was produced to smoothly fit three-dimensional solids. The warp or weft of the winding fabric bend were normally made with different lengths, which may result in shear deformation in many cases and accordingly twisting the structure of the fabric after fitted onto the solid. In order to solve the problem mentioned above, a theoretical formula was used to calculate the optimal intervals of the pick-spacing and an improved structure thus was developed in this study.

Abstract: Due to the complexity of sedimentary process of the strata, the distribution of porosity in clastic rock is not homogeneous but random. From the point of microscopic structure, pores in reservoir rock are fractal, and the fractal dimension can describe quantitatively the complexity and the heterogeneity of pore distributions. Geographic Information System (GIS) is a kind of technological system collecting, storing, managing, computing, analyzing, displaying and describing the geospatial information supported by computer software and hardware. In the last 15-20 years, GIS have been increasingly used to address a wide variety of geoscience problems. This paper first calculated the pore fractal dimension in three casting thin sections of clastic rock which came from cores of FengTan1 Well and FengCan3 Well in Dangfeng-Xinghua, JiangSu Province using box-counting method, then predicted the porosity according to the porosity fractal model of rocks in GIS environment. In the last we compared the fractal porosity prediction results with mercury experimental data, and we saw the differences were not significant, so the method in this paper to predict porosity of clastic rock is easy to implement and has high precision.

Abstract: A non-contact liquid level measuring system is designed based on image processing technology, and it consists of three parts: a COMS camera, a laser source, and a PC. The work principle of the device is: the laser beam from the laser source is irradiated to the liquid at a certain angle, and the image of the tank’s interior is picked up by the CMOS camera; then the light spot on the liquid surface is extracted by the technology of image processing; Through the center of the light spot, the information about liquid-level can be obtained. The model of the measurement system is proposed in the paper, and the method of the calibration is given by using the least square algorithm. Experiments tests that the liquid level measuring device can be used in strict and adverse environment.

Abstract: The simulation model for describing the transportation and transformation of landfill leachate pollutant in landfill, soil and underground water was established. Taking Wuhan Changshankou landfill for example, the numerical simulation was carried out. The simulation results showed that if there’s no any seepage control measure, the groundwater and soil under landfill will be polluted seriously after MSW was filled; the highest pollutant concetration in landfill was about 25000, and the one in groundwater and soil was about 20000; at the thirtieth year, the pollutant concetration in groundwater and soil still remained up to 10000 although the one in landfill was about 0. The simulation results also showed that the vertical stonewall can’t be used as a nature, and artificial seepage control system must be used.

Abstract: In Code Division Multiple Access (CDMA) communication systems, the pilot pollution in high-rise building area is an increasingly prominent and long-standing problem, which seriously affects Quality of Service (QoS) and User Experience (UE). This paper presents a predicting method of pilot pollution in high-rise building area covered by Outdoor Base Station (OBS).The method, which is based on Operation Maintenance Center (OMC) and location (LOC) data, can predict pilot pollution severity occurred in high-rise and pertinently recommend a prioritization scheme, by analyzing the relationship of pilot strength, distance and angle between target area and OBS. The validity and feasibility of this prediction method have been verified by Call Quality Test (CQT). Operators Capital Expenditure (CAPEX) and Operating Expense (OPEX) could be greatly reduced with the efficient and convenient prediction.

Abstract: Piezoelectric actuator is being widely used in precision positioning technology for its high resolution of displacement, high stiffness and fast frequency response. However, its hysteresis nonlinearity limited its control accuracy. The key way to eliminate this limitation is to describe the nonlinearity. Aiming at the inaccuracy of Preisach model, the characteristic of piezoelectric actuator was introduced, and its static hysteresis were studied by experiment. Then bilinear interpolation was introduced to calculate the Preisach model prediction which was not located in the experiment table, and a bilinear interpolation Preisach hybrid model was proposed. The experiment results revealed the proposed Preisach hybrid model to be an accurate one.

Abstract: Ultrasonic seniors and infrared sensors are utilized in the robot to range and locate. The precision of the whole system is often impaired. In order to improve the system’s precision, the method of adaptive weighted fusion algorithm basing on minimum mean square error is employed in this paper. According to the experimental results, this method is highly effective in the further improvement of the system ranging precision.

Abstract: An online AdaBoost based tracking algorithm in FLIR imagery is proposed, where tracking is formulated as a binary classification problem. The object features are selected adaptively via online boosting. And then, a strong classifier is built on the weak classifiers. The confidence map of consecutive image frame is created by the strong classifier. The object localization is realized by detecting maximum of the confidence map using mean shift. The weak classfiers are updated according to the new samples to improve the discriminative ability to the object appearance and complex scene. Experiment results verify the effectives and robustness of this tracking algorithm which can improve the tracking performance efficiently.

Abstract: The problem of non-fragile memoryless controller design for a class of uncertain nonlinear stochastic system with time-delay is considered. Based on Lyapunov candidate and the stochastic Lyapunov stability theory, the sufficient conditions making the closed-loop system robust stable are given and de-rived. All results are given by the form of linear matrix inequality (LMI) method. Numerical example is given to illustrate the effectiveness of the controller designed.

Abstract: Aiming at obtaining lantern shape litchi flesh, a pitting machine was devised and made. Cutter shaft is one of the most important part of the machine and its reciprocating motion cause impact load on the machine. Unilateral load on the surface of the groove result in excessive wear of the cutter shaft. In view of the above problem, dynamic characteristics and the optimum design model of the cutter shaft are established. Used nonlinear optimization toolbox of MATLAB, the best structure parameters of the cutter shaft were calculated. The results are: (1) minimum mass of the shaft is 0.6421 kg ,which is lighter 10.07% than before;（2） the best spiral angle of the groove is 38.38°. 3D parameterized models of the cutter shaft were built and their kinematics simulation were made by using Pro/ENGINEER software. The simulation and test results show that the more rotate speed and spiral angle of the groove are, the higher press on the surface of the groove bears. The above results provide basis for improved design of the pitting machine for litchi fruit.