Advanced Materials Research Vols. 989-994

Abstract: In this paper, four original full typical UHF partial discharge signals are measured by using log-periodic antenna in 3-meter anechoic chamber environment. The relevance vector machine is applied for the study of partial discharge characteristics and the two relevance vector machine classifier are applied for the classification and identification of four partial discharge models. The experimental results are satisfactory. Compared with support vector machines, relevance vector machine can obtain more sparse classification model with probabilistic output value. It has a shorter test time and is more suitable for online testing. This method has a good prospect in partial discharge pattern recognition and online monitoring.

Abstract: Water resource, as a kind of important economic and natural resource, plays a vital role in sustainable development of society. Currently, global water resources situation is increasingly severe, especially in China. The water resource distribution in China is uneven with low efficiency and pollution problem. Based on a full analysis of research actuality in China and abroad, this article explores water use efficiency and input redundancy of 31 provincial regions in China for the year of 2011. Reasonable indexes are chosen to evaluate the efficiency based on advanced DEA for helping establishing future policies.

Abstract: This paper has a comprehensive analysis on mineralizaton process of the bauxite in Wuchuan-Zheng, an-Daozhen (WZD) area, northern Guizhou, China through synthesize former research. Geologic characteristic demonstrates that WZD bauxite is a typical sedimentary deposit, minerogenetic material have experienced a transporting process. Sedimentary environment of WZD bauxite is transition facies. Sedimentary environment is reduced and acidic. Accompanying frequent transgression and regression, bauxite has suffered a leaching process. In the leached period, environment is oxidized and acidic. Leaching process is the most important factor for the information of high grade bauxite. WZD bauxite has experienced several times leaching resulting in the great runoff of Fe and Si. Actually the metallogenetic process of WZD bauxite is a process that Al relative enrichment but Si and Fe runoff.

Abstract: Nonlinear insulated materials can uniform electric field distribution in non-uniform electric field. In order to inhibit the electric tree initiation and propagation inside high-voltage cross-linked polyethylene (XLPE) insulated cable, a kind of 220kV high-voltage XLPE insulated cable with new structure is designed by embedding nonlinear shielding layer into XLPE insulation layer of high-voltage cable with traditional structure in this study. Experimental and simulation results indicate that the nonlinear shielding layer can effectively inhibit electrical tree propagation inside the XLPE specimens, and obviously extend the breakdown time caused by electric tree propagation. When the electrical tree propagates into the nonlinear shielding layer sandwiched between insulation layers of cable, the electric field distribution near the tip of electrical tree is obviously improved. These findings prove the feasibility and the effectivity of inhibiting electrical tree propagation inside high-voltage cable by adding nonlinear shielding layer into the insulation layer.

Abstract: This paper describes the basic principles of dipartition of the power supply area and uses Voronoi diagram on the dipartition of the power supply area. This paper put forward a model of improved Voronoi diagram based on the basic Voronoi diagram. Depending on the existing transformer substation’s capacity and power supply area surrounding the spatial distribution of the load, we determine weights based on the main transformer capacity and the spatial distribution of the load. In the process of generating the power supply area, we adjust the weights depending on different regions ofthe spatial distribution of heavy load to generate the power supply area based on improved Voronoi diagram model. Then we adjust according to the basic principles of the power supply area and the result based on improved Voronoi diagram model to generate the final result. Compared to the traditional division based on artificial experience, it can reflect rationality of the power supply, improve the accuracy of the partition.

Abstract: The innovative hybrid impact hydroforming (IHF) technology use high energy forming complex parts in very short time which can improving forming quality of hardforming materials like Aluminum alloy widely used in automotive and aircraft industries. The impact hydroforming technology means the most features are formed by hydroforming and the small features are rapidly reshaped by high intensity impact energy in a very short time after the traditional hydroforming. Thus, the impact energy is the most important parameter of Innovative Hybrid Impact Hydroforming. Using numerical simulation software MSC.PATRAN/DYTRAN, the whole system of hybrid impact hydroforming apparatus was analyzed. The initial gas pressure and the mass of hammer directly affect the energy efficiency. The results show greater initial gas pressure will linear increase the energy output. Moreover, the bigger mass of hammer will reduce the velocity of hammer, but it still increase the energy output. Therefore, the research is very useful for improving energy efficiency of IHFand widing its application.

Abstract: Based on measured data and laboratory experiments, the spatial and temporal distribution of nutrient loads of Lake Taihu from the sources of river runoff, atmospheric bulk deposition and internal release was quantitatively analyzed. Results showed that: (1) In 2011, annual river inputs of total phosphorus (TP) and total nitrogen (TN) respectively were 2382.4 tons and 50245.0 tons, and annual river outputs of TP and TN respectively were 849.1 tons and 24236.7 tons, Huxi area was the major transverse source of nutrients as a large proportion of TP(71.6%) and TN(66.2%). (2) Annual nutrient loads of Lake Taihu were 3306.6 tons TP and 48007.0 tons TN, of which the contribution of river runoff, atmospheric bulk deposition and internal release to TP accounted for 46.3%, 38.3% and 15.4%, and that to TN accounted for 54.2%, 43.7% and 2.1%, respectively. (3) Inputs of nutrients to Lake Taihu were higher in summer (June to August), of which 983.9 tons TP and 8874.9 tons TN in June, 1420.9 tons TP and 7463.3 tons TN in July, 1347.1 tons TP and 7181.3 tons TN in August. The results have great significance for eutrophication control and water environment protection in Lake Taihu.

Abstract: Enzyme activities play key roles in the biochemical functioning of soils, including soil organic matter formation, degradation and nutrient cycling. Activities of invertase, urease, and catalase were analyzed at different age of tea garden. The results showed that urease activity only showed a significantly negative relationship with the age of tea, and a significant positive relationship with organic carbon. This indicated that soil urease acitivity could respond well to the change of soil organic carbon and is a more sensitive indicator of soil fertility than other enzyme activities. The study also found that the organic carbon was relatively low in 50yr site, compared with lower age of sites. This may be caused by the high activities of invertase and catalase per unit of organic carbon in the soil of tea which tends to help decompose and therefore decrease the organic carbon in soil

Abstract: Physicochemical modeling of drainage water in the tailing dumps of Komsomolsky tin ore district in a wide temperature range from-10 to +45 °C obtained in the article let to find Eh-pH parameters of micropore solutions from which technogenic and hypergene minerals crystallize. The modeling was made for different ratios host rock – sulfides (95:5, 90:10, 80:20 and 60:40). Qualitative and quantitative ionic composition of the solutions was determined and their impact on the surface and ground water of the area was showed.

Abstract: Modeling allowed us to show Eh-pH parameters of the technogenic mineral formation in the mining-industrial technogenic system of polymetallic ores of Dal’negorsk district, to study the process of the hypergene mineral crystallization from solutions, to consider the qualitative and quantitative ionic composition of solutions, to show the role of hypergenesis in the contamination of surface and ground waters of the area. The aim of this work is to estimate the action of the CCM tailing oxidation on the hydrosphere of the district using the method of physicochemical modeling. The results obtained testify to a significant evacuation of a wide range of elements of sulfide ores (Zn, Pb, Cu, As, S) and enclosing rocks (Si, Al, Mg, Ca, K, Na) from the CCM tailing dumps into the surface waters polluting the hydrosphere with them.