Advanced Materials Research Vol. 462

Abstract: Many researchers have developed a wide range of mathematical method for predicting the weld strength by arc signals, However, These mathematical method are so complex and no good use according to the complexity of welding. This paper addresses grey analysis to analyze the arc signals. Results indicate the pulse voltage is the most important factor to the weld strength, optimal parameters can be found and the experiment also proved the conclusion. It was found that grey relational analysis is a good tool to find the most important factor to the weld strength from the processing parameters, which can instruct the actual production.

Abstract: In this study, we developed a detection algorithm using machine vision for faulty scarfing on slabs. Scarfing is a process for burning out defective areas on the surface of semi-finished steel products so that the product is suitable for subsequent rolling or forging. In the case of rolling, a poorly scarfed slab can cause serious defects. Therefore, an automatic inspection system for scarfed slabs should be developed. In the image of faultily scarfed slab, discontinuous bright bands and borderlines are observed. To detect the bright bands, we examined the real part of a Gabor filter. However, because the size of the bright bands is not fixed, the parameters of the real part of the Gabor filter were determined adaptively using the imaginary part of the Gabor filter. The performance of the proposed algorithm was tested with 2292 images of scarfed slabs of which 49 of the images were of faulty scarfed slabs. The proposed algorithm was able to detect defects with 95.9% accurate and the false alarm was 1.6%.

Abstract: The machining process design principles discussed in the main, provide some valuable information for the preparation of a reasonable part of the processing technology has played some help.

Abstract: Through a case of glass plate cutting, two-dimensional cutting pattern problem of rectangular blanks is discussed. The raw material is cut and layout by applying the method of grouping and two-stage cutting pattern types. Here first all the blanks are divided into different groups based on certain requirement, and then two-dimensional cutting pattern problem is transformed into two one-dimensional cutting problems. Through constructing an integer programming model, the cutting program of the raw material can be obtained step by step by calculating in LINGO. Because here the precise algorithm of integer programming is applied, which is not the time algorithm of polynomial, in the specific implementation, there shouldn’t be more variables, so all the data should be divided into different groups to calculate. In each group, there should be no more than 6 blanks, which are grouped according to their size. This algorithm is simple and easy to operate with a high material usage.

Abstract: Undoped and ZnO: Mn thin films with different Mn content ( 5, 10 and 15 mol%) were grown on glass substrates by spray pyrolysis technique. X-ray diffraction analysis showed that single phase wurtzite structure is formed in all samples. XRD results also indicated that the undoped ZnO were crystallized in c-axis oriented wurtzite structure, while the ZnO: Mn thin films were polycrystalline. The SEM results revealed that Mn presence were modified the surface morphology of the samples. The optical transmittance measurements were performed in the wavelength range from 190 to 1100 nm. The refractive index, extinction coefficient and film thickness were determined by using pointwise unconstrained minimization model. It was observed that the refractive index increased with the increase in Mn concentration. Also, the thin films exhibited the direct band gap increased from 3.20 to 3.28 eV with the increase in Mn content. The optical dispersion parameters have been calculated and analyzed by using Wemple-Di Domenico relation. The obtained values showed that dispersion energy E_d of doped samples was found to be decreasing comparing to undoped thin film.

Abstract: Three-dimensional demonstration platform for oil spill response simulation in the Three Gorges reservoir area established the oil spill response three-dimensional displaying system including the two-dimensional GIS platform on the basis of environmental dynamic prediction model, oil spill model, GIS and virtual reality technology. The platform for oil spill response simulation in the Three Gorges reservoir area development process and put study emphases on the key technologies. It can provide decision-making basis for pollution emergency disposal in the Three Gorges reservoir area. It also has important significance to improve the level of water environment pollution prediction.

Abstract: The aim of this paper is to analyze whether the intermittent heating mode is feasible for residential buildings in Lhasa, the thermal parameters of each palisade structure and the influence law of intermittent heating mode on the indoor thermal environment. In this paper, the DeST energy consumption simulation software that is compiled by Tsinghua University was used to simulate and analyze a residential building in Lhasa city. The results show that: It is completely feasible to carry out intermittent heating in Lhasa area. Considering the indoor temperature reduction should not be too large during intermittent heating break, it is recommended to adopt external insulation. Compared with continuous heating mode, heating open 8 hours and 12 hours a day can save energy 24% and 39% respectively. The results can provide evidences for intermittent heating operating control and energy- saving.

Abstract: On the worldwide basis, gas hydrate is about two times the total carbon in coal, oil and conventional gas in the world. The enormous size of this resource, if producible to any degree, has significant implication for worldwide clean energy supplies and global environmental issues. This paper deals with the potential of gas hydrates as a source of energy which is widely available in permafrost and oceanic sediments. It discusses methods for gas production from natural gas hydrates. Many questions remain to be answered to determine if any of this potential energy resources technically and economically viable to produce.

Abstract: Today，there is a continuous need for more clean energy, this need has facilitated the increasing of distributed generation technology and renewable energy generation technology. In order to ensure the supply of renewable energy generation continuously and smoothly in distributed power generation system, need to configure a amount of energy storage system for storing excess power generated. This article outlines some energy storage technologies which are used in power systems in the current and future, summarizes the working principles and features of several storage units, provides the basis for the design of energy storage system.

Abstract: Based on the nonlinear finite element analysis, the deformations and stresses of the CFRD in the completion and storage stages were simulated. The deformation and stress laws of the dam body and the panel in different stages were predicted. Finally, the sensitivity analysis of main parameters of the Duncan-Chang E-B model was carried out by the multiple indicators of orthogonal design method, and the critical sensitivity parameters of the deformation and stress on the CFRD were obtained. The results can take some reference for the design, construction and safety monitoring of the CFRD.