Advanced Materials Research Vol. 853

Abstract: Silicon nanowires (SiNWs) based solar cells are passivated by native oxide and SiN_x bi-layer. In comparison with cells passivated by SiN_x single layer, bi-layer passivation exhibits higher effective minority lifetime, illustrating a better surface passivation effect, which leads to a gain of internal quantum efficiency in the short wavelength range, a better output performance with an increase of 0.16% in efficiency. The data obtained from this work is fundamental and has some reference value for future studies.

Abstract: The paper approaches the possibility of power functioning of the Aeolian systems. Power Aeolian systems, due to high inertia moments and rapid variation in time of the wind speed cannot constantly function on the maximum power point. Therefore it must be considered the matter of determining the optimal functioning speed of the Aeolian device on the basis of evaluating the momentary wind speed in order to get maximum of electric power. The calculation is based upon an original mathematical model for the wind turbine TV and an experimental direct follow of the wind speed in time. Actually, it is presented the way of loading the generator according to the wind speed.etc.

Abstract: Photovoltaic panels (PF), combined with lead-acid battery (AE), are increasingly used, to produce electricity. To work in maximum power points, between (PF) and (AE) is interposed a static converter (DC-DC), which is a harmonic pollution source. Within the paper there are calculated the power losses, due to current harmonics, of a photovoltaic system working at its maximum power. Photovoltaic system works at its maximum power, if in the electronic system there is permanently voltage control among solar battery terminals.

Abstract: In view of the local conditions of Xingshan Iron Mine North Dump, an economically safe load shedding scheme was determined. Based on critical sliding field technology, the most dangerous slip surface can be searched of different waste-dump slope angles. Once the most dangerous slip surface is fixed, limit equilibrium methods can be used to analyze the stability of the slope. The corresponding slope angle of minimum allowable safety coefficient under the most unfavorable condition was defined as the optimal slope angle of this section, and the minimum optimal slope angle of all the sections of dump was determined as the final optimal slope angel of the whole dump. This method was not any practical but also extremely economical, which can ensure the absolute safety of dump and its surroundings.

Abstract: Water Information mainly using digital photogrammetric, remote sensing , telemetry and other digital technologies and equipment acquisition variety of water infrastructure data can also be used digitizer or scanning technology to non-digital information digital, this thesis summarizes the use of databases, spatial database and data warehouse technology to store and organize data , high-speed data communications network to transfer data , data mining and artificial intelligence technologies such as processing, use and dissemination of data . These results show that the effective application of digital technology is the important basis for water information.

Abstract: New housing completions constitute a considerable share of the overall housing supply in Chinas current urban housing markets. We argue that large-scale new housing developments significantly increase energy consumption in the long run, thereby increasing energy prices. The aim of this study is to examine the effect of supply-side housing variables rather than demand-side housing variables on energy prices in Beijing. Supply-side housing variables include level variable (floor space) and growth variable (changes in floor space). We investigated their respective effects on energy prices. We tested for cointegration, Granger causality and weak exogeneity. Tests indicated that new housing completions exerted a positive long-term effect on energy prices. Hence, new housing development needs to improve energy efficiency.

Abstract: As one of the environmental pollution sources, the noise problem in recent years has been as the focus of environmental protection control. As the noise pollution source, automobile noise has been studied in this article. At First, the influence factors of automobile noise are introduced, and then the major noise sources are all analyzed. Finally, three kinds of control methods such as noise control method from mechanical theory, from acoustic theory and active control method are introduced.

Abstract: In order to ensure safety and reliable operation of the natural gas pipeline drainage valve,the 3D numerical simulation on flow field characteristics inside the drainage valve of the natural gas pipeline under the different conditions of the seasons of winter and summer is carried out by using the standard model. In the tow different season condition, the streamline and velocity vector distribution inside the drainage valve has been studied. Under the two seasons conditions are studied. The results show that as the change of drainage valve opening the turbulence appear in the valve and the maximum value appears in the inlet,which the winter is larger than summer.The velocity vector distribution in the drainage valve is not the same and the larger velocity appears at the drain exit with the valve opening increasing. The differences in temperature, condensate discharge, condensate gas pipeline in different displacement,density and viscosity in the winter seasons and summer seasons results in the different characteristic.of the flow field characteristics inside discharging valve.

Abstract: Studied on improved varieties and its parents growth characteristics. Discusses the Populus fine varieties Populus alba×Populus bolleana with its parents differences to promote varieties of Populus to provide a theoretical basis for Populus alba×Populus bolleana .The results showed:(1) Comparison of 3 varieties height accumulative increment consistent, individual difference were not significant. (2) 3 poplar varieties cumulative growth of DBH have difference, xinjiang Poplar DBH growth in the 2-8 years was slow , while the Populus alba Linn. and Populus alba×Populus bolleana continued to grow. 3 varieties DBH growth contrasts: Populus alba×Populus bolleana > Populus alba Linn.> Populus alba.(3) Populus is significantly lower than the volume growth Populus alba×Populus bolleana. Populus alba×Populus bolleana volume growth in 15 years and still maintain a high level of greater than Populus alba Linn.Populus alba Linn.and Populus alba.before the Populus alba×Populus bolleana arrivals the quantitative maturity .

Abstract: In order to evaluate the lithium-ion battery charging during electric vehicles regenerative braking, by testing on different initial SOC, charging current and temperature, the charging curves of lithium-ion battery are drawn under different conditions, and various parameters are derived. Based on a single factor in the impact of change on energy recovery, analyzed the influencing factors of coupling mechanism. Get approximation functions between energy recovery and multi-factor using multiple regression analysis method, and built energy recovery models. According to some experimentation with measured value and the calculated value, indicated the set of polynomials energy recovery model efficiency.