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Online since: December 2013
Authors: Yan Feng, Bing Feng Xu, Yue Xue, Guo Juan Wu
Basin Rural Water Environment Condition Basin Rural Water Environment Problem Analysis.
Water was polluted since the late 1970s.
Pesticides and fertilizers use, sewage irrigation, mulch residue cause water pollution in soil, surface water and underground water.
Because sewage discharges intermittently and randomly, the region sets low water standards and the quanlity and quantity of water fluctuate.
In the case of relatively week economics, complex geographical conditions, lack of professional management in Dianchi Lake Basin, based on site survey and rural sewage treatment technique in other place,this paper try to find out the most economical technique equipped with less investment, low energy consumption, convenient management, good effect, well anti-impact capability. 1) Enhanced Ecological Wetland Technique.
Online since: March 2015
Authors: Ming Da Liu, Jun Xing Li, Xiao Wei Liu, Dan Yang, Ran An
Water becomes more and more scarcely, especially the drinking water.
In the new rural drinking water safety project, the qualified rate of water is low (some even less than 40%) and medium water infectious diseases often occurs [1].
Moreover, less management personnel and poor professional knowledge level make it more difficult to operate the complex water treatment equipments.
The ozone water processor is developed as an economical and efficient water treatment device.
Luo, Application and evaluation of Ozone Water Processor used in small rural drinking water supply system, Urban Water Supply. 5 (2011) 86-88
Online since: January 2014
Authors: Chong Zheng, Qing Liu
However, due to the difficulty of maritime control in inland complex waters and the lack of attention to inland waters development, there are some problems in the maritime control in inland complex waters.
Firstly, as the lower barriers to entry than seafarers, inland crews’ qualities are generally low and they are short of professional training.
The indexes must be selected based on the complexity of the inland complex waters.
The complex waters there have more tidal flats and long fog period.
Conclusions According to the maritime control status in inland complex waters, this paper established a performance evaluation model of maritime control in inland complex waters.
Online since: September 2011
Authors: Xin Hua Zhao, Xue Wei Zhao, Xi Zheng Zhang
But until 1990 Rau and other professors really begins to use professional design of water knife in clinical applications in Germany [1].
Industrial water jet has a wide working pressure range, therefore the nozzle materials of water jet are various.
“A new study of water knife debridement equipment”.
“High pressure water cutting nozzles research”.
Water jet cutting technology and application”.
Online since: May 2011
Authors: Meng Liu, Chun Yu Huang, Qun Ying Cheng
Therefore, the energy consumption in buildings will increase as the whole country goes[1], attracting great attention from relevant professionals and policy-makers.
In which, the power is the dominant carrier for HVAC, lighting, other services appliances; natural gas is mainly used for restaurant, hot water supply and winter heating and the oil is only for winter heating when the oil-fired boiler is adopted.
Online since: May 2012
Authors: Hai Bo Jiang, Hang Guo, Jie Liu
If the tower is installed on the reefs, its bottom will be in direct contact with air and sea water hence its corrosion is easier than a single environment.
We suggest take measures focusing on coatings system which includes isolation of materials, anti-rust sealing [4], complete sealing of wind turbine's cabin, to prevent high-salt high-water air into the cabin with shell cooling mode in stead of air cooling mode. 3) While installation one of the critical factors is to consider how to balance the overturning moment from typhoon.
As the density of water is over 800 times of the air and considering the above data, we conclude that the South China Sea wave energy and ocean current energy resources are relatively abundant.
Fourth, all the components are different with their corresponding available ones in market on the structure, materials, processing technology, thus are required to re-design, manufacturing alone, so the cost of the wave or ocean current power generation equipment is times or even hundreds of times of cost of the same power wind equipment in the market. 3) Installation is difficult There has to be professional divers for submarine installation, so foundation construction is extremely difficult.
On the other hand, people on coral reefs lacks management experience, professional repair knowledge or diving skill which would probably cause permanent dysfunction of the equipments [6]. 2.3 Application feasibility analysis With the comprehensive analysis of the pros and cons of wave and ocean current energy for power generation, we conclude the infeasibility of power generation in coral reefs within future ten years.
Online since: June 2014
Authors: Xin Wu, Liu Yang, Jian Ping Shi, Yang Yan
Many people, including some professionals, have such misunderstanding of environmental-friendly buildings today: new techniques must be used and the cost must be high.
In order to prevent the steam getting into insulating layer through the structural layer, and making water-drops, which damages the function of heat preservation moisture barrier can be put under the layer.
Usually, waterproofing paint and brushing matched with rubber roll-roofing 2mm,or adding a layer of stones or ceramsite as ventilate layer onto the insulating layer, or making screen-coat and water-proof coiled material.
Using solar energy to provide hot water, heating and air conditioning is an effective method to realize the adaptation to cold climate, thermal insulation and energy saving of the buildings like solar-thermal wall and roof, etc.
Moreover, renewable energy such as wind energy, biomass energy, water energy in cold district can play an important role in climate adaptability of the buildings.
Online since: January 2013
Authors: Yu Wen Ju, Yu Cong Zhang, Ji Yuan Wu
The coastal areas of soft clay generally have a large thickness, high water content, void ratio, low-intensity, high-sensitivity, high compression resistance, low permeability characteristics.
Cement mixing pile construction quality control points Application of cement mixing pile technology must pay attention to the choice of the construction site, one must be a case of normal consolidation, and the second be mud soil, plain fill, organic soil, peat soil and a high water content foundation and its bearing capacity of the standard value must be less than 120kpa the soft ground.
The reasonable position excavation formulated grout mortar pool with cement mortar surface waterproofing treatment; water to clean the entire pipe and test whether the pipeline clogging, until the water is drained before drilling.
Applications in cement mixed piles of soft ground treatment needs to pay attention to several matters In cement mixing pile construction should be selected professional staff responsible for, and full implementation of monitoring.
It should be selected site construction records of professional personnel at the construction, detailed records the construction pile Date, shotcrete depth, the rig speed, stop pulp elevation, slurry flow and complex mix depth matters[7].
Online since: January 2013
Authors: Xiao Mei Shang, Zheng Li, Hui Qin Sun
For example, in process control comprehensive experiments, one is the fluctuation water tank double let property test experiment.
Through the experiment we can get fluctuation water tank characteristic curve, and then get second order system transfer function.
In the control panel on the water pump 1, electric control valve.
Setting valve opening value and enable the water level in a equilibrium position, then write down valve opening value.
Professional technology:52-53(2010) [3]Lian Zhikai.
Online since: October 2013
Authors: Yan Yu
The use of solar thermal energy can produce solar water heaters, gas stoves and other solar energy solar heating equipment; can make use of solar energy photovoltaic photovoltaic power generation, but also produce solar cells, photovoltaic materials, etc.; photosynthetic energy can be simulated using the synthesis of organic compounds such as plant photosynthesis.
Wind energy is the solar radiation, the surface a lot of air temperature and water vapor content due to changes in flow generated by the kinetic energy.
Chinese solar energy resource potential, water heaters use mature technology, with economic and market competitiveness, so solar thermal utilization of renewable energy use, and even in the future energy supply can play an important role.
Problems of New Energy Industry Development Policy support and incentives is not enough.The current level of technology and policy environment conditions, in addition to hydropower and solar water heaters have the ability to participate in market competition, most of the development and utilization of renewable energy costs are high, coupled with scattered resources, small scale production is not continuous, etc., in the current under the rules of the market competitive, the need for policy support and incentives.
At present, new energy technology talent in short supply, especially of highly qualified professionals, at this stage very lack of qualified domestic talent, which also caused the new energy enterprises is fierce competition for talent, personnel mobility is relatively high.
Showing 921 to 930 of 3745 items