Advanced Materials Research Vols. 143-144

Abstract: In this paper, the standard genetic algorithm is modified based on the deduction of Rolle theory. A kind of genetic algorithms is set up. Combined the modified genetic algorithms with finite element method, a new kind engineering optimization method is established. This optimal method takes fully advantage of the unique feature of genetic algorithms that the optimal solution is achieved by a rapid global search and takes advantage of the unique features of FEM that the computation is accuracy. This method can solve multi-objective problems with more complex constraints in the engineering. The procedure is developed by VC++. Housing’s fillet angle of the universal rolling mills is optimized using this method. Compared with the zero order method and first order method companied with ANSYS, the result of this optimizing method is better.

Abstract: Design is a philosophy, is a building integrated system database, It is an emerging form of construction industry, but BIM itself on case also is not a new concept for most people the knowledge, BIM is not only breaking two-dimensional to three-dimensional design development, with more than a four-dimensional space, with integrated database concept, the engineering quantity estimates, forecasts, integrated management and construction progress and ranking logistics integration in promoting green building and energy conservation and pollution reduction has made outstanding contributions to great savings in manpower, financial, improve efficiency and reduce the chances of errors.

Abstract: How to ensure the operating performance of farmer in the agricultural industrial production process is very important. This paper take the unique institutional innovation pattern of agricultural industrialization such as “company +cooperative+peasant household”as a example，and analyzes the motivation of why to Create the mode、 highlight of institutional innovation and operation performance. The results showed that the mode ensures the households' main position through institutional innovation in the agricultural industrial production process，and it is feasible to coordinate the interest conflict between the company and the peasant household through cooperative，and if the main position of cooperative can be really implemented that the effects of institutional innovation will be more good.

Abstract: This passage develops a set of arithmetic process for the image of the weld seam in flanges, which suits the weld process according to the feature of the seam. In terms of the arithmetic process for image, traditional methods are replaced by the opening and closing of mathematical morphology, which effectively smoothes the interferences of weld points, surface scratches, glistens and false edges, thus forming sharp and smooth image of weld seam. The arithmetic process of image proves to be brief and highly effective, which meets the practical need of the construction supported by the image of the weld seam. This passage also, taking weld seam as an example, focuses on the discussion of the erosion and dilation of the opening and closing calculations, which are of great value towards administering the process of processing editing the image.

Abstract: The whole unknown parameters estimation and hypothesis testing is the most common and most commonly used statistical inference,so clarify the relationship between them is very important.Clearing both unity and not uniformity will help to amend the emergence of some specious argument of statistical work. In this paper, some differences were analyzed on interval estimation and hypothesis testing of statistical inference theory,the scope of their application of two methods was discussed, the dualityof Neyman —Pearson hypothesis testing and confidence interval was described Then provided the method of determining the unknown parameters’ confidence interval in hypothesis test.at the same time, it provided the ideas how to solve the problem of refusal field of hypothesis test througn confidence interval . As the confidence interval of the statistics varies with the selected significance level and sample size, it is heavily influenced by subjective factors.

Abstract: The apply of harmonic eauation is know to all. Our interesting is to get the regularity os their solution, recently for obstacle problems. Many interesting results have been obtained for the solutions of harmonic equation ande their obstacle problems, however the double obstacle problems about the definition and regularity results for non-homogeneous elliptic equation. In this paper , the basic tool for the Young inequality,Hölder inequality, Minkowski inequality, Poincaré inequality and a basic inequality. The definition of very weak solutions for double obstacle problems associated with non-homogeneous elliptic equation is given, and the local integrability result is obtained by using the technique of Hodge decomposition.

Abstract: Direct drive wind power system need full-scale high power converter, such as flying capacitor multilevel converter. On the realization of high power electronic equipment, an important problem is that the working frequency of high power devices is too low to apply excellent modulated technique such as PWM. In large-power equipment, the switching frequency of power electronics devices is such low that good control performance can't be obtained with a single converter. In order to overcome this problem, Carrier phase-shifted SPWM technique (CPS-SPWM) has been researched. Reactive power compensation and harmonic reduction are two relevant research problems that exist in wind power system. With the advancement of modern power electronics technology in both circuits and devices, new and better solutions are being proposed and applied to solve these two problems. To compensate reactive power, a flying capacitor type multilevel inverters with a Carrier Phase-Shifted SPWM(CPS-SPWM) switching scheme is proposed. All this verified by simulation and experiment.

Abstract: Moves the multimedia studies is one kind of new study form. Today which in the Internet high speed development, the multimedia technologies renew unceasingly, use wireless network merit, constructs the transportable multimedia digital classroom, by “scientific style” the way helps the school solution training facilities to reform the question, has enlarged the school educational reform step.

Abstract: The influence of T6 heat treatment on the microstructures and aging precipitation in the grain-refined A356 alloys were investigated. Experimental results showed that, when T6 heat treatment was performed, the average values of mean diameter, aspect ratio, and roundness of silicon particles in the grain-refined specimens were decreased to 2.26~3.14 μm, 2.06~2.2, and 3.1~4.2, respectively. DSC curves revealed that three kinds of precipitates, i.e., β″, β′, and β, were observed in both unrefined and grain-refined A356 alloys. The exothermic peaks in the grain-refined A356 alloy shifted to high temperatures, suggesting the nucleation of β″ precipitates was decelerated. This could be ascribed to the minor solution of Ti or B elements during solid solution treatment.

Abstract: The vehicle routing problem with backhauls (VRPB) is considered in this paper, and an effective tabu search is proposed for VRPB to minimize the used vehicle number and total travel distance. The proposed approach is compared with the greedy randomised adaptive memory programming search published recently for the same purpose, the results show the high performance and effectiveness of our approach.