Advanced Materials Research Vols. 989-994

Abstract: This paper studies the application of the transformer protection in 220KV substation, proposed the use of the digital transformer protection device to protect the transformer. Through long-term experiments, the system is stable and high-reliability, and it can achieve effective by real-time monitoring and protect the transformer, so that the operating environment has improved radically.

Abstract: Data center presented in this paper, has a high requirement on the power supply system, that needs emergency power supply, SVG compensation device, large diesel generator set, two lines of mains large capacity UPS and other electric equipments. And there are some differences between data center and conventional power system in many aspects,such as in the nature, quantity, the load requirements, the related electrical equipment configuration, load, power supply mode, connection,and so on.

Abstract: The paper extracts the urban ecological environmental quality evaluation index, based on hierarchical analysis model, the integrated use of "pressure-state-response" model, through the frequency statistics method, factor comparison method and expert evaluation method and so on to set up urban ecological environmental quality evaluation system in nearly a decade based on the related data of environment quality evaluation of Zhengzhou city. Results show that from 1998 to 1998, Zhengzhou ecological environmental quality rises year by year, the ecological environment on the basis of good for Zhengzhou city ecological security evaluation and management.

Abstract: After a discussion of present problems of eco-environmental construction on municipal virescence , water environment and water ecology, and landscape as well as urban ecological system of quantity, quality and capacity in Zhengzhou, the causes of these problems are analyzed. Measures are put forward, such as knowing the meaning of municipal eco-environmental construction, increasing the environmental protect consciousness of managers and enhancing the municipal eco-systemic construction.

Abstract: The temperature and humidity on the lawn and brick underlying surface at differnet distances from the bank of Yellow River in Lanzhou, Gansu province, China (Lanzhou reach of Yellow River) were continuously monitored from 6 a.m. to 8 p.m. for 5 days in August and September 2013, respectively. With increasing distance, the temperature gradually increased, but the humidity remarkablely declined. The influence of Lanzhou reach of Yellow River on the temperature-humidity effect on the two underlying surfaces was dependent on the distance from the bank of Yellow River. The relationship between the temperature on the lawn or brick underlying surface and the distance was a significant positive correlation, but the humidity in this thesis and the distance showed the remarkable negative correlation relationship. The maximum distance of the temperature and humidity effect from the water of Lanzhou reach of Yellow River was calculated, and their range was 236.4-317.1 m and 248.8-289.2 m, respectively,

Abstract: With rapid development of economy, the crisis of land resources is faced. Land expansion by enclosing sea in estuaries has become an important carrier for city space extension. In this paper,the large-scale marine reclamation project in the Oujiang River Estuary (ORE) of Wenzhou shoal was taken as an example.Based on the intoduction of the study area,the 3D marine numerical model (EFDC) was setup and used for simulation of sediment enviroment and morphological changes induced by the reclamation. The results indicated that the project doesn’t have obvious adverse effects on its nearby sediment environment and seabed. On the contrary, it settles the problem of mouth bar of the ORE and provides some advantages to maintain and steady the deep water channel and improve the sail condition from the north mouth of Oujiang River to Huangda’ao channel.

Abstract: Understanding the salinity transport mechanism in the estuaries is of great importance for coastal engineering, disaster prevention, water security and intertidal zone aquiculture.In this paper,the large-scale sea embankment in the Oujiang River Estuary (ORE) of Wenzhou shoal was taken as an example.Based on the intoduction of the study area,the 3D marine numerical model (EFDC) was setup and used for simulation of salinity changes induced by the embankment. The results indicated that the ORE is well-mixed estuary. The Ling-Ni Embankment designed in accordance with the flow direction makes the freshwater inflow reach far away, the salinity gradient increase, and the tongue contour reach further. The salinity difference of the north and south side of the embankment sea area is increased.

Abstract: In the future development of city, traffic acts a very important role, which not only support the modernization of city, but also offer more travel and transportation service for the increasing city population. Therefore, it is necessary to study the urban traffic, energy consumption and carbon emission based on System Dynamics. System Dynamics not only offer quantificational references and advice about city planning for the government, but also make people understand the present status of urban traffic and possible development trend of urban traffic under the influence of different policies. In this review, the energy consumption and emission of urban traffic, the development of System Dynamics and the advantages on solving urban traffic problems based on System Dynamics are introduced.

Abstract: Experimental research and engineering validation show concentrated activated sludge reflow stead of traditional reflow way still meets the national discharge standard, though the treatment efficiency of wastewater plant is slightly declined and further show concentrated activated sludge reflow process used in energy saving and consumption reduction of small-sized wastewater treatment plant is feasible.

Abstract: Fluctuation is an inherent property of wind power. Analyzing fluctuation of wind power has a significant meaning either for improving prediction accuracy of wind power or for overcoming disadvantages coming from wind power and power grid connection. Based on methods of statistics analysis and fitting, starting with a wind power plant, this paper analyzed the characteristics of probability distribution of wind power fluctuation. We selected wind power data from different sites and time scales, based on variation of probability distribution characteristics, this paper researched fluctuation of wind power under different spatial and time scales.This paper pointed out power fluctuation difference between single wind machine and the whole wind power plant.