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Online since: February 2013
Authors: Yu Han Cheng, Shao Bai Zhang, Jian Bin Cheng
In the "sustainable development" under the influence of ethics, professional colleges and universities Electricity experiments and the campus network are facing new opportunities and challenges.
Electrical science and engineering colleges and universities with the most common type of professional basic courses and specialized courses basic course experimental group, which is characterized by wide application, teaching a wide range of number of pupils, a large share of that funding for experiments.
(7) Pay full attention to experiment saving, water saving during the experiment.
Online since: August 2012
Authors: Hui Yang, Yin Zhang
Based on Analytic Hierarchy Process in the Study of Cave Construction Yin Zhang1, Hui Yang2 Xi’an University of Architecture & Technology, Xi’an, 710055, China Key words :Cave ; Analytic Hierarchy Process ; Ladder Level Structure Model Abstract: This article mainly study on AHP application in cave dwelling construction system, based on the combination with professional experience and the investigation of the folk, put forward the influence factors of building in caves, By establishing the hierarchical structure model ladder to explain the interaction of the various factors relationship,And then calculate and recognize the key factors in influencing of the cave-building, in the hope of improving the construction quality of a cave reference function.
Because of soil has vertical joints, when water penetrates into the soil, its vertical penetration is 50 times as horizontal penetration. so it is the most important for caves waterproof
Mice and worms usually hole in the soil, it can form the pores which let water inject into the cave.
If the cave has used for a long time, the top of cave will collapse due to water seepage.
Table 5 Cost control weights between the various factors Remarks 1 2 3 0.5396 1.6238 λmax=3.0093,CI=0.00464, Look-up table RI=0.58,CR=0.00799<0.1 1/2 1 2 0.2970 0.8936 1/3 1/2 1 0.1634 0.4918 We can see the weight from the table : E1 0.5396, E2 0.2970, E30.1634. 3 Conclusion AHP Analytic Hierarchy Process method for the quantitative analysis of the results and the empirical analysis is broadly consistent with, and can be summed up: Crack prevention control is the key to quality control, moisture control is the guarantee of water control; In progress control, location of the cave is very important, directly affecting the normal follow-up work safety; While the highest cave construction cost of construction, annual repairs second.
Online since: April 2015
Authors: Jan Hart, Veronika Nídlová
Initially, the finger was heated with hot water in a container, but this method was rejected because the water cooled.
The finger beds were soaked using water in a container.
After removing the finger from the water bath, it was dried with gauze and tested on the measuring panel.
Before purchasing an access biometric identification system, it is necessary to consult with professionals in the field and pay attention to the reliability of individual biometric systems.
Online since: December 2012
Authors: You Pei Hu
However, there is a professional gap between the field of microclimate and urban form studies and the urban form design practice, which impedes the transformation of research achievements from the former to the latter and has an impact on the orientation of the research issues.
This leads to the fact that such knowledge is mainly grasped by technical experts and professional software, and it is difficult to be converted into the design instruments which can be accessible to the designers. 2.
This helps narrow the professional gap between this field and design practice.
Groleau, Modeling the influence of vegetation and water pond on urban microclimate, Solar Energy 80(2006) 435-447
Online since: December 2006
Authors: Xin Qi Yu, Zhen Hui Wang, Pei Ying Peng, Mei Hong Liu, Ren Liang Cai
Water was supplied by pressured gas and the mating faces were lubricated.
Müller: Proceeding of 16th International Conference on Fluid Sealing (Professional Engineering Publishing Limited, United Kingdom 1997)
Rokicki: Proceeding of 16th International Conference on Fluid Sealing (Professional Engineering Publishing Limited, United Kingdom 1997)
Etsion: Proceeding of 16th International Conference on Fluid Sealing (Professional Engineering Publishing Limited, United Kingdom 1997)
Online since: May 2011
Authors: Chi Yao, Tao Xie, Wei Wei, Qing Hui Jiang
Reinforcement Analysis of Wanjiakouzi Arch Dam Using 3D Nonlinear Finite Element Method WEI wei1,a, JIANG Qinghui2,b, YAO Chi1,c, XIE Tao2,d 1State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China 2School of Civil Engineering, Wuhan University, Wuhan 430072, China aweiwei_276@qq.com, bjqh1972@yahoo.com.cn, cyaoc51@yahoo.com.cn, dtseaser@163.com Keywords: Wanjiakouzi hydropower station, arch dam, complex foundation, 3-D finite element method, reinforcement.
Water-retaining structure of the station is a roller concrete double hyperbolic arch dam, the foundation of which is at the elevation of 1285.00m.
At the Wanjiakouzi dam site, the water flow direction of the river is between 25°and 30°, river surface width is 20m~33m, river bottom elevation is 1295m~1300m and the angle between rock strike and water flow direction is greater than 70°.
It can be concluded from Table 4: Table4 characteristic values of dam stress with different calculating schemes Principal stresses With reinforcement Without reinforcement Upstream face 1.57 1.32 -4.68 -4.45 Downstream face 1.07 0.84 -5.95 -5.75 (1) The maximum principal tensile stress value is 1.57MPa without reinforcement measures, which is greater than the limited value 1.50MPa in the design specification for concrete arch dams (The Professional Standards Compilation Group of People′s Republic of China.
[4] CHEN Mingxiang: Elasticity and Plasticity (Science Press, Beijing, 2007), in Chinese [5] ZHOU Weiyuan, YANG Qiang: Numerical computational methods for rock mechanics (China Electric Power Press, Beijing, 2005), in Chinese [6] The Professional Standards Compilation Group of People′s Republic of China: DL/T5346–2006 Design specification for concrete arch dams (China Electric Power Press, Beijing, 2006), in Chinese
Online since: October 2011
Authors: Ying Yu
With the calculation of professional software, the load of the soil heat pump is 1650 KW in summer is relative to the basic heating load of 60 % in winter.
To test the effect of heat exchanger, the actual test data, thermal parameters and other parameters, such as hourly load, are inputted into the professional data analysis software.
The end supply water temperature is 7 degree, return water temperature is 12 degree in summer.
The end supply water temperature is 45 degree, return water temperature is 40 degree in winter.
Real-time regulating bypass valve’s opening by detecting the pressure of hot and cold water, supply and return water.
Online since: February 2013
Authors: Chao Hui Wang, Chu Cai Wu
Especially seasonal water supply is still serious, according to the investigation in National Day in 2011, some streams including Jing ming, Lingyan and Lingfeng have been cut off in the Yandang mountain national forest park.
Balance ability for water supply and demand: ①the surface water supplies must ensure that supply of landscape water won’t be affected; ②effective water-saving measures have been taken in the hotel, the guesthouse, motel and family hotel including the logo and slogan of saving-water and so on;③water-saving induction tap and vacuum toilets have been installed in public toilets and guest rooms of hotels; ④the rainwater collection system have been established to collect rain to irrigate green ground, flowers and trees and to flush road.
Environmental quality for surface water: ①in national forest parks to reach class I of standard (GB3838--2002) is regarded to be "safe", the rest reaching class II is regarded to be "safe"; ②to achieve class III for landscape water quality is regarded to be " safe".
Intensity of wastewater treatment: ①phosphorus-free and organic standard bath and detergent only have been utilized in park; ②high standard and water-saving vacuum toilets have been set up in the guest houses of hotels and public toilets, and wastewater have been treated in biogas digester; ③ the toilet waste- water and sewage have been separated, and sewage treatment have been treated into intermediate water for car washing and watering flowers and so on; ④methane have been promoted in the community.
[3] Xin-xiang Cao, Tai-zheng Chen and Wei-hong Wang: Journal of Soil and Water Conservation Research Vol.13 ( 2006), p. 209
Online since: June 2012
Authors: Wei Wu, Yan Ming Chen
Research of flood prediction based on subjective/objective evidences fusion model WU Wei1, a, CHEN Yanming1 1 Department of Computer and Information Engineering Zhejiang Water Conservancy and Hydropower College amwuwei@163.com Keywords: flood prediction;subjective and objective evidences fusion;BP neural network;DS evidence theory Abstract.
Based on the background of Baiyun mountain reservoir water resource documents, presents the method combined with BP network and DS evidence reasoning.
Among them, the various factors affecting water resources are treated as measured objects, and the sensor group is responsible for original equipment online collection of information, pre-processing of information (including filtering, noise removal, compression, etc.), and passing information to the partial fusion center to be partially integrated, and finally in the fusion center to be combined, analyzed, evaluated, and thus judge result obtained.
In this paper, we adopt different BP neural network as classifiers to respective fields, and take the credibility value of the neural network classification results and the credibility value of the professional knowledge of experts in the field as input evidence of DS evidence reasoning model, to get high accurate feature classification results of subjective/objective evidence fusion.
For example, Jiangxi province Baiyun reservoir, 2000-2003 flood statistical data, shown in Table I: Table 1 reasoning results of Flood dynamic prediction system fusion center Each Professional Fields Evidence Fusion Input evidence basic probability distribution function value (credibility)(0-1) Feature classification results 0.4302 0.3084 0.0983 0.1131 0.05 unsure 0.4405 0.4156 0.0605 0.0334 0.05 unsure 0.8091 0.1000 0.0409 0 0.05 Flood, determined by expert reasoning system 0.2230 0.4305 0.2740 0.0225 0.05 unsure 0.5484 0.3869 0.0325 0.0261 0.0061 unsure 0.4118 0.5475 0.0342 0.0056 0.0009 unsure 0.7780 0.2165 0.0049 0.0005 0.0001 Flood, determined by subjective and objective Takecalculation process as the example: , K1=m1(u1)*[m2(u2)+ m2(u3)+ m2(u4)]+ m1(u2)*[m2(u1)+ m2(u3)+ m2(u4)]+ m1(u3)*[m2(u1)+ m2(u2)+ m2(u4)]+ m1(u4)*[m2(u1)+ m2(u2)+ m2(u3)] Calculate from Table 1:K1 =0.5751,then 1-K1=0.4249。
Online since: August 2012
Authors: Hai Feng Chen, Miao He, Yi Pan, Shuang Chun Yang
Background Natural Gas Hydrates, constituted by methane and water (CH4 • H2O) which is formed in different low temperature (0-10 °C), and high pressure (> 3 MPa) conditions [3], with a white solid crystalline substance, looks like ice, or solid alcohol.
Type-H structure not only can accommodate the above all kinds of molecules, but also can hold the general crude oil iC5 molecules. [4] [5] [6] Natural gas hydrate is a kind of solid crystalline substance which was formed by natural gases and water at relatively low temperatures and high enough pressures [7].So it mostly located in depths greater than 300 meters above the seafloor sediments or in the cold permafrost.
Chinese Academy of geological sciences such as Hou Zengqian in the middle Okinawa trough JADE hot water sedimentary area submarine found CO2 rich natural gas hydrate (through into the sea)[12] .
Guangzhou natural gas hydrate research center, CAS Lanzhou frozen soil, State Oceanic Administration and Ministry of land and resources of Qingdao Marine Geological Institute has engaged in natural gas hydrate researches in professional teams.
In order to provide a good exchange of gas hydrate condition for the researchers, professional conferences on natural gas hydrates are frequently held.
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