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Online since: June 2014
Authors: Yu Fen Cao, Yun Yue Chen, Lin Qin, Wen Jun Ni
Study on the Method of Establishing Standardized Testing System in Marine Sounding Sonar Yufen Cao 1, Wenjun Ni1, Yunyue Chen 1,a and Lin Qin 2 1 Tianjin Research Institute for Water Transport Engineering, Tianjin 300456, China 2 Tian Jin Zhong Wei Aerospace Data System Technology Co.
Summarize verb of the testing system At present, the domestic has not set up the professional, jural bathymetric sonar instrument quality inspection agency, and a system of Marine sounding sonar testing system.
The absolute error has nothing to do with the depth of the water, such as the hull heave measurement error, tidal correction error, positioning error, the error due to hull pitch and roll, etc.
The relative error is closely related to the depth of the water, such as sound velocity error and the error due to beam Angle, etc.
Water Transport Engineering-Echo Sounder[S], JT/T 571-2004.
Online since: March 2012
Authors: Qing Hua Chen, Hao Fei Xie, Ping Wang
Introduction At present, the hot water heat-supply systems [1] of some cities in cold areas are basically charged by users’ heating area, and are lack of heat-equipment and heat- measurement.
Design of the Master Station Monitoring System For one thing, heat meter is an emerging meter, which is different from existing water, electric, and air automatic reading system in data collecting and saving.
Device Information Field: 12 bytes in length, including meter ID (4 bytes), manufacture ID(2 bytes),version(1 byte), device type(1 byte), visit-number(1 byte), meter status(1 byte), and digital signature (2 bytes) Heat Data Field: 40 bytes in length, contains 7 segments, including the information of accumulated-heat (6 bytes),   accumulated-flow (6 bytes), flow-water-temperature (5 bytes), return-water-temperature (5 bytes), instantaneous flow (6 bytes), power (6 bytes), and time-stamp (6 bytes).
HQ2010AA0401028003 and No. 2012ZX03005002 References [1] Bairakova O.J, Molodegnikova L.I, Rachmatulina L.I: Using of the Heat Pumps in Hot Water-Supply System, Modern Technique and Technologies 2002 [2] CJ 128-2007: People’s Republic of Urban Construction Industry Standards -Heat Meters, 2007.10.15 [3] Q.Hao: The status and development of the intelligent automatic meter reading system, China Science and Technology Information, no.19, pp: Oct 2005
[6]Dusan Petkovic,: Microsoft SQL Server 2005: A Beginner’s Guide, McGraw-Hill,2006 [7]Yujun Zheng, Jiaxing Du: SQL Server 2005+ Visual C# 2005 Professional Developers Refined Solution, Tsinghua University Press, June 2006
Online since: September 2014
Authors: Min Shang, Yong Huang Deng, Xin Xu
Introduction Landslide is a kind of geological phenomena that the slope slide integrally under the effect of gravity, water pressure, seismic power and others.
In order to observe the stability of landslide, the landslide thrust monitoring method sets pressure sensors in different depth of landslide to monitor the cross thrust force of the landslide and its transformation.The method is qualified for various kinds of landslide monitoring and could afford thrust data for the prevention and treatment engineering designing. 3.2.3 Hydrographic Monitoring The main monitoring objects of hydrographic monitoring are underground water level,pore water pressure,spring discharge and river level.The common instruments includes water level gauge,osmometer,pore water pressure gauge and TDR soil moisture meter.The hydrographic monitoring applies to the landslide monitoring at different deformation stage.The achievement could be used as initial data. 3.2.4 Environmental Monitoring The trigger factors of landslide mainly include earthquake,rainfall,freeze-thaw and human activities.Thus,it is quite important to monitor the rainfall,ground temperature and earthquake.The
Conclusions In recent decade,China has made a large number of professional landslide monitoring with various monitoring method,achieving a lot of data and experiences.However some key technical problems of landslide monitoring still exist and should be solved urgently.Firstly,for ignoring the actual geomorphology, geological environment and geological conditions,the practical work is always lack of combination of quantitative with qualitative,manual monitoring with automatic monitoring,.Secondly,lacking of geological analysis,the chosen of the monitoring point is made only by experience rather than the analysis of landform,geologic structure and genetic mechanism.Thirdly,because of ignoring the actual demand in the different stages of landslide monitoring,the blind pursuit of variety and high-grade leads to the waste of money.Fourthly,the present study of geological disaster warning methods, models, and criterion is lack of depth.The forecast theory and method,which has been proved by
Online since: January 2013
Authors: Ji Hong Wang, Yang Wang, Mei Lan Li, Zhi Dan Zhang, Lian Sheng Du
Introduction Sediment habitat for many aquatic organisms, is mainly composed of minerals and organic matter debris, which is the main storage of the biogeochemical cycles of nutrients and release sites, and the main destination of water nutrients [1,2].
The research can enrich and develop the organic-mineral complex studies and can provide a theoretical basis for controlling the water pollution.
The first group (G0) is Water dispersion complex; the second group (G2) is Sodium dispersion complex; the third group (G2) is Sodium grinding complex.
Conclusion and Discussion Divided the organic- mineral complexes into three groups: the first group(G0) is Water dispersion complex, the second group (G2) is Sodium dispersion complex ,a kind of Calcium-combined organic-inorganic complex, the complex in this group has an very important effect on the formation of Structure body, the third group(G2) is Sodium grinding complex, is an iron and aluminum oxides sturdy combined organic-inorganic complex.
Beijing:Agriculture Press,1988:40-41(In Chinese) [6] Professional Committee of Chinese Soil Science Society of Agricultural Chemistry.
Online since: September 2014
Authors: Yan Peng Zhu, Yong Zhong Ren, Yong Zhou
(3) (4) when the bottom of unclosed curtain for cutting off drains located gravelly soil aquifer, sand aquifer, silt aquifer, for homogeneous aquifer, underground water seepage meet Eq.(4) soil flow stability requirement
The north of site is T605 road, the east of site is T606 road, the south of site is T604 road, the weast of site is Yantan community, the total construction area is 135 112m2, because of the difference of the number of basement floor, the excavation depth is not equal, the length of excavation is 201.8m, the width is 67.73m, according to geotechnical investigation report,the stratum are miscellaneous fill, fine sand, grait, sandstone, respectively, ground water level located -2.8m.
The software is used Lizheng deep excavation structure desgin software V7.0.Considerring stratum condition of Lanzhou, because coefficient of permeability of miscellaneous fill and sandstone are small, water permeability is small, so the analysis method is total stress method, the water permeability of grait is large, so the analysis method is water and earth pressure separately.
[6] The Professional Standards Compilation Group of People’s Republic of China.
Online since: January 2018
Authors: Ildikó Merta, Ana Mladenovič, Janez Turk, Aljoša Šajna, Alenka Mauko Pranjić
Flax and hemp cultivation is associated with emissions to soil and water.
Natural fibres are highly hydrophilic, absorbing water up to 2.5 times of their weight.
To prevent this, the fibres were first soaked in water (saturated surface dry condition) and then added to the cement-sand mixture together with the water for cement hydration.
The data about the production of raw materials (natural aggregate at quarry or gravel pit, cement CEM II 32.5 at cement works, tap water, fibres, etc.) were obtained from the “professional+extensions” database, integrated within the GaBi software.
Due to their high hydrophilicity, natural fibres require additional water several times of their weight.
Online since: September 2019
Authors: Severino Rodrigues de Farias Neto, A.G. Barbosa de Lima, W.R. Gomes dos Santos, H. Luma Fernandes Magalhães, J.L. de Oliveira, R. Pereira Ramos
Two-Phase Flow (Oil and Water) in Ducts with the Elliptical Cross-Section: Modeling and Simulation J.L. de Oliveira1,a, A.G.
The geometry used consists of a horizontal pipe with an elliptical cross-section of 10 m long, as illustrated in Figure 1.The geometry was developed in Autodesk Inventor Professional 2015 and, after that, exported to ICEM CFD 15.0.
Case Volumetric fraction Velocity (m/s) Effect of gravity (m/s2) (kPa) oil water oil water 1 0.99 0.01 3.0 3.0 - 72.921 2 0.95 0.05 3.0 3.0 - 70.311 3 0.95 0.05 3.0 3.0 9.8 70.313 4 0.95 0.05 0.5 3.0 9.8 10.514 5 0.95 0.05 5.0 3.0 9.8 124.201 Figures 12 and 13 illustrate the behavior of the volumetric fraction of the oil and water, respectively, at z=5.92 m (Case 3).
From the analysis of these figures, it can be seen that the water is completely dispersed in the continuous phase (oil), forming the flow pattern called water-in-oil dispersion.
Pereira, Experimental study and modeling of the corrugated oil-water layer.
Online since: July 2012
Authors: Dong Hui Chen
"Heat box" diagram According to reports, the 30cm long, 5cm in diameter of the tubular device is Ecowatts British researchers took the company 10 years developed, it seems very simple structure, the current through the tube from the water, potassium and chromium alloys after the liquid catalyst mixture is converted into heat.
This device can not give the developer a clear answer, but they speculated that this process may not be a source of energy in cognitive function, it may be a hydrogen atom in the water sub-atomic state of existence.
If the reaction around the device are covered with water, with water temperatures, can become a simple household heaters.
Some of the professional course, this phenomenon is called the peak, and some called surge.
Online since: February 2014
Authors: Xiong Bin Cao
Invulnerability Analysis of large logistics supply chain network in complex environment based on the Internet of things Cao Xiongbin Hunan railway professional technology institute, hunan zhuzhou China 412001 Cxb0733@126.com Keywords: Internet of things, supply chain, invulnerability Analysis Abstract.
With the development of Internet of things technology, its application area will continue to expand in the future, involving the fields of military, economy, construction, traffic control, water supply and drainage network, medical and health care management and logistics services[4].
In the design of link line, the highway, railway, water transport in the supply chain, aviation, pipeline etc. are set as the sides in the link line of the network.
As analysis as above, the logistics loads for the failure node, it is: (4) The lines which are connected with the nodes, such as air, water, transportation, etc. the load capacity of these lines can be expressed as: Connected with the node edge, namely logistics supply chain in the supply channels such as air, water, transportation, and these edges, and the load capacity of these edges, expressed as: , , (5) From formula (4), we can get: (6) Where, assumed , then, , we can get that the load of nodes is equal to half of the sum of adjacent edge load, namely that the material flow capacity is equivalent to half of total logistics of its adjacent edge line.
Online since: May 2012
Authors: Wen Jing Wang
If the outdoor temperature exceeds 18˚C and humidity exceeds 45%, dew condensation will appear on the exterior wall and such phenomenon as “sweating” and “water running” will appear on the interior wall, which will result in the occurrence of mildew; then the wall will emit a smell of mildew and with the prolonging of time, the mildew will gradually grow into green floss, which will continues to grow into black macrotrichium.
The application of raw materials shall strictly follow the principle of “Inspection before usage”, the materials shall be purchased on a selective basis and construction materials with unknown manufacturer or un-inspected quality shall not be purchased; [2] requirements shall be made to such indexes as the time of initial setting and final setting, water-cement ratio, slump and so on of the concrete according to the structural characteristics and the raw materials selected shall comply with requirements.
(3) Reinforce professional knowledge training for the quality supervisors, draw up specific supervision plan and uniformly instruct the construction units to carry out construction activities.
For example: water-storing test shall be conducted for toilet, kitchen and roof which have water-proof requirements and the test shall be reported to quality inspection station for random inspection.
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