Advanced Materials Research Vols. 1079-1080

Abstract: The wind turbines have gained a wide range of applications in Renewable Energy Sources (RES) by virtue of its dominant advantages, and it has achieved almost the state-of-the-art from the engineering point of view. Nevertheless, the starting behavior which plays a prominent role in wind power generation has achieved few studies up to this moment. We conducted this analysis of a micro horizontal axis wind turbine (MHAWT) on its starting behavior to give insight into its start-up torque as well as its start-up speed on an assumption that it is rigid body, and some relative simplification on its structure are adopted meanwhile. The wind turbine's power coefficient C_P, tip-speed-ratio l along with torque coefficient C_T were taken into consideration and discussed to a large extent in order to having a relative clear cognition of its operational characteristics.

Abstract: In order to recognize andvalue the comprehensive benefits of decentralized waste water treatment andreuse project in the hotel,according to the water balance in the process ofreclaimed water reusing, determined its structure and content elements with theview of system theory, pointed out the influence factors of water balance, combinedwith the example, the entropy weight method is used to analyse and calculate theweight of influence factors, got the main reasons for system water imbalance, providedsome advice for the investment and configuration of the reclaimed water reusein the hotel.

Abstract: When the large oil-immersed transformer start with heavy load in cold regions, due to the high viscosity of the oil at low temperatures, the flow of the oil is extremely slow in the early start of heavy load, resulting in a negative heat radiation. At the same time, the winding and the core are rapidly increasing heat in the early start of heavy load. Rapid increase in heat and the lack of heat dissipation caused a series of problems. In this paper, we study the process of heating and cooling when the large oil-immersed transformer start with heavy load in cold region and takes a transformer of 31.5MVA as example to build a three-dimensional model ,the model is based on the actual size of the transformer. We use the finite volume method to calculate three-dimensional temperature field distribution changing with time when the oil-immersed transformer startup with heavy load in - 35 °C,-30 °C and-25 °C three cases. The results show that the viscosity coefficient of transformer oil is very high at low temperatures. In the early start of the transformer, because of the poor fluidity of the oil, the heat cannot be dissipated in time and the transformer local overheating near the winding. Then we analyzes the damage of local overheating for a short period of time in the transformer, especially the damage of the oiled paper's insulation At last ,we analysis of the causes of transformer internal local overheating and give some measures to avoid local overheating when oil-immersed transformer start with heavy load in cold regions.KEYWORDS: oil-immersed transformer, cold regions, start with heavy load, FVM, three-dimensional temperature distribution

Abstract: This primary goal of this study is to facilitate robust strategic decision- making regarding current and future deployment of microalgae-based CO₂ capture technology. Based on Porter’s value-chain theory, a chain of activities that are common to all businesses are divided into primary and support activities. This study then attempts designs a microalgae-based CO₂ capture value-chain model. This model shows that value drivers of microalgae-based CO₂ capture, benefit markedly economic development. According to this value-chain model, one can choose a suitable strategy that to increases economic value. The microalgae-based CO₂ capture value chain is a practical task in the development of microalgae-based CO₂ capture technologies for thermal power plants. This value- chain model will guide investments and inform deployment decisions for microalgae-based CO₂ capture technologies.

Abstract: In this paper, we design a modified insecticides lamp, LED the device by using solar battery as a power supply, high voltage power grid as a hunting tool, through the MCU drive different wavelength of LED strobe. Compared with ordinary insecticides lamp insecticide effect, improved the LED insecticides lamp peculiar four-color stroboscopic technology can be more traps in pests. By sampling clock chip and humidity sensitive resistor, the device will automatically work in spring and summer clear night, met YinYuXue fog and other adverse weather will automatically shut down. The device can be applied to farmland, orchards and other places of a large area of farming, and human nature, energy saving, environmental protection, for the development of LED insecticides lamp provides a new train of thought.

Abstract: Width and height ratio is a characteristic geometry feature of wind turbine foundations. This study establishes the relationship between security of wind turbine foundations and their width and height ratios. There are a number of works on checking wind turbines, however, limited works about how the width and height ratio influences the structure were conducted. This paper provides fifteen models of three different shapes, five circular foundations, five hexagon foundations and five triangle foundations. Data from a wind farm in Guizhou, China, is used to calculate the main wind loads acted on wind turbine structures. Then key factors concerning with security of foundations were obtained. And they were put together so that it is easy for us to find their relationships. The results show foundations have different performance at different ratios. It’s change laws were so clear, security of foundations is improved by the increasing of width and height ratio. On the other hand, hexagon and triangle foundations were certificated suitable for general projects.

Abstract: Using CFD software to simulate the indoor different ventilation system of different outlet position. Analysis the characteristics of the interior velocity field and temperature field in different conditions.We obtain in the same conditions ,set air vent on the home have a bigger efficiency than the traditional way.,and supply air velocity has a remarkable influence on the ventilation efficiency compared to the supply air temperature.

Abstract: The cost of building insulation materials in construction phase has a significant impact on its energy costs in operational phase, so that it plays a meaningful role to make the total cost of insulation material low in both phases. From the point of the selection to thickness of outer heat insulation materials, this paper, making full use of energy simulation software, is keen to study on the thickness of heat insulation materials based on optimal cost principle in perspective of whole life cycle, in case of an artitecture in a some shopping mall. With the aid of eQUEST energy smulation software, this paper tries to simulate the cost of cooling and heating technology, besides it simulates different thick insultion materials, which takes advantage of mathematical models to acquire the relationship between energy consumption and thermal insulation. At last, it can be summarised the best thickness of heat insulation materials with low cost, and it can also provide some proposed improvements for the original design through comparision.

Abstract: In subsurface environment, small-scale heterogeneities usually cause the reduction of the applicability of in situ remedial techniques. Biogeochemical heterogeneities and preferential groundwater flow paths create complex hydrogeologic conditions at most contaminated sites. A thorough understanding of the resulting three-dimensional distribution of contaminants is a necessity prior to determining a need for remediation. In this study, a gasoline spill site was selected to examine the effects of aquifer heterogeneities and geochemical variations on petroleum hydrocarbon biodegradation via different oxidation-reduction process. At this site, two multilevel sampling wells were installed to delineate the lateral (5 m) and vertical (0.5 m) distribution of contaminant concentrations and different biogeochemical parameters. Two 5-cm (I.D.) continuous soil cores [from 4 to 8 m below land surface (bls)] were collected within the gasoline plume to evaluate the distribution of the microbial population in soils. Results show that high microbial activities were observed in soil samples based on the following evidences: (1) high petroleum hydrocarbon degradation rate, and (2) high microbial biomass. Each soil section was used for chemical extraction, microbial enumeration, and grain size distribution. Results show that the soil sections with more permeable sediment materials corresponded with higher biomass (total anaerobes > 2 x 10⁶ cells/g) and significant contaminant degradation. However, those sections with less permeable sediments contained lower microbial population. Results indicate that the subsurface microorganisms were distributed unevenly in the aquifer, and some regions were devoid of microorganisms and biodegradation activities. Spatial distribution of microorganisms, soil materials, and biogeochemical characteristics in the subsurface soils control the extent and kinetics of contaminant biodegradation. Thus, using blended aquifer materials for measurement of in situ biodegradation rates may not achieve representative results.

Abstract: In recent years, with the rapid development of the era economy and ever-changing science and technology, today's era information gradually moving towards a diversified network communication. Sensor networks data aggregation mainly gradually reduce redundant transmission and reduce energy consumption to the maximum extent. Currently sensor network data aggregation scheme as an important form of information transmission, is widely used in all kinds of data transmission. This sink node comprehensively checks and compares data and also ensure its secure transmission of data. In the process of researching and analyzing a secure and transparent gathering sensor network program data, this paper firstly introduce the safety data convergence protocol and encryption data aggregation scheme, and then build the network model and the attacker model and elaborate sensors data convergence specific program and finally analyze sensor network data solutions security.