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The solar inverter is an important part of photovoltaic power generation, but is also the field of the research of the electrical source technology and power electronics technology. In this paper, starting from the utilization of solar energy, solar inverter status and the basic control method are analyzed. The practical significance and application prospects of the digital power conversion technology...
This paper describes the concepts of free software and commercial software development and their operation modes based on CMM,also compares Similarities and differences in demand management, plan management, Configuration Management, Quality assurance between them.
Methyl tert-butyl ether(MTBE) is widely used as gasoline additive. Surface waters in China were polluted by MTBE with different degrees. MTBE was found to be one of the most resistant towards molecular ozone attack and difficult to be degraded by microbe. In this study, experiments were carried out to investigate the removal efficiency of MTBE by catalytic ozonation in the presence of two kinds of...
The paper introduced the algorithm of image retrieval witch combination the features of color, texture and shape and so on. Firstly, the internal and exterior normalization of multi-features are studied and analyzed, and introduced the normalization algorithm in detail. Secondly, the retrieval methods of the multi-features are showed. Lastly, adopted the Euclid distance metric, and used the UIUC image...
The communication scope, strength depth and its relationship to the social-economic activities are studied about the external communication from the households in the countries in west China based on the telecom communication charge. The following is the results. Except for the local province, the main scope of the external communication for the study region was the comparative developed regions in...
Groundwater has been seriously contaminated in Ningzhuang coalmine, China. In order to study contanminant trend, the sandstone aquifer system of Shanxi formation and upper limestone aquifer system of Taiyuan formation of Ningzhuang coalmine are investigated in this study. The sandstone aquifer system of Shanxi formation and upper limestone aquifer system of Taiyuan formation are of confined aquifer...
In order to overcome the deficiencies of the traditional Artificial Immune Systems (AIS) in the security field of computer information system, an immune danger theory inspired model for network security monitoring is proposed in this paper. After introducing the back ground to the danger theory, a novel model for network security monitoring is presented. With the formal definitions of antigen, antibody,...
The severe global fresh water shortage, the over-exploitation of groundwater and its related ecological environment geology problems, the global climate change, all of them are stimulating the study and practice of artificial recharge. But the clogging problem during artificial recharge is always to be the most common obstacle, it can reduce the recharge rate, increase the maintenance cost and shorten...
Wheat straw is one of the most abundant and cheap agricultural wastes, and it is estimated that about 250 million tons are produced annually in China. Wheat straw is predominantly disposed of by direct burning in open field due to lack of e??ective utilization, which also causes serious environmental pollution. It is an important issue to deal with the agricultural waste both for the comprehensive...
The potential of wheat straw as raw materials for ethanol production was investigated. Ethanol cooking at 190 ?? for 60 min was adopted as pretreatment method for dilute sulfuric acid impregnated wheat straw. The pretreated wheat straw was used as substrate for the production of ethanol by simultaneous saccharification and fermentation (SSF) through orthogonal experiment design in the present study...
This paper introduces the stratified intelligently controlled heating system for high-rise buildings, which Terminal monitoring PC communicates with AVR single-chip computer on each floor through wireless channel, so as to monitor the operational status of the entire network accurately in real time. The adoption of factor self-modify fuzzy control system, compared with traditional PID modulator, makes...
By wavelet analysis of daily PM10 pollution index in recent 9 years in Shanghai, the multi-scale variations, primary period and influencing factors are analyzed. The result shows the air pollution pattern presents “serious in winter and slight in summer” at most scales; varies at diverse time-scales, and the primary period of the daily variations is about quasi seasonal.
Nowadays, the factors such as China's current rapid economic development, combined with China's vast territory, large population, the deficiency of social productive forces, as well as the imbalance development between rural economy and urban economy lead to more serious energy and environmental problems for the realization of China's sustainable development and new industrialization road. Circular...
The preparation process of hydroxypropyl-β-cyclodextrin was optimized to the degree of substitution and recovery in this study. A central composite design of response surface methodology involving reaction time, reaction temperature, dialysis time was used, and second-order model for the yeild was employed to generate the response surface. The optimum condition for the preparation process was determined...
In economic computational grids, resources have prices and the users must pay for executing their applications. The user determines his deadline and budget and then requests cost or time optimization. A resource selection service that adopts cost optimization strategy should select heterogeneous grid resources for heterogeneous user applications so that their execution finishes in the specified deadline...
The South Taihu Lake receive localized metal pollution from the factories nearby. The aim of this study was to find out the heavy metal accumulation in South Taihu Lake. Concentration of some heavy metals (Cu, Zn, Cr, Ni, Pb, Cd) were determined in sediments samples. Heavy metal levels were analyzed by ICP. Concentrations varied significantly from different sampling sites. The results showed that...
Along with the rapid application of large-scale integrated circuit and computer system is growing by geometric series, the boundary between hardware and software has blurred. EDA, a novel technology arisen in recent years has been challenged with the traditional hardware design, because the original method and mode cannot satisfy modern hardware system design. In this paper, we implement the complex...
Social and economic sustainable development is restricted by shortage of water resources in northern China, environmental geological problems which induced by groundwater over-extraction. In this essay, an assessment method of groundwater allowable withdrawal evaluation is discussed, take the Manzhuang water source for example, on the basis of the exploitation of pumping test methods for calculating...
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