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Online since: December 2014
Authors: Ronaldo Alves Medeiros, Maryangela Geimba Lima
Table 1: Dosages of the investigated specimens of concrete Type of sample Cement [kg] Sand [kg] Gravel [kg] Water [kg] 1 420 588 882 168 2 420 588 882 210 3 420 588 882 252 A type of cement (CP V) commercially available in Brazil was used.
According to Table 1, it can be verified that three different types of concrete samples have been molded, the only difference between them was the quantity of water in concrete.
It has also been verified that the higher the amount of water in concrete is, the lower the electrical resistivity is too.
It is know that the higher the amount of water in concrete is, the higher its permeability also is [9].
Monteiro, Concrete: Microstructure, Properties and Materials, third ed., McGraw-Hill Professional, 2005.
Online since: May 2012
Authors: Dan Zhang, Jun Yong Sang, Fa Hui Wang
It is related closely with the type of soil, soil water content, and heat and moisture transfer, so it is almost impossible to establish the Numerical calculation model that Reflect the actual working condition, to exact solution based on the calculation of existing technology[4].
The initial and boundary conditions are for ,; for and,; for and,; for and ,; for and , for and ,; for and,; 2.3 The parameters for calculation Table 1 Technical features of the calculation Year-round weather information Average temperature (℃) 20.7 Highest temperature (℃) 38.9 Lowest temperature (℃) -10 Average relative humidity (%) 45 Soil physical parameters average temperature in the soil in underground 1m(℃) 22.4 Soil coefficient of thermal conductivity(w/mk) 1.3 Soil density(kg/m3) 1695 Underground heat exchanger parameters Buried tube type horizontal Pipe materials px-b Buried tube chief(m) 50 Pipe diameter(m) 0.016 distance of two tube (m) 0.3 Thecalculation results and analysis Fig2 Changes of Ground temperature Fig3Changes of Ground temperature (Mass Flow as 0.041 kg/s) (Mass Flow as 0.018 kg/s) In the numerical calculation, the average temperature of water–anti-freeze solution is12.4
Acknowledgements: This work was financially supported by the Fluid machinery and engineering provincial key subjects (507907), Thermal energy and power engineering characteristics professional(508057) , The school Key subject (509927);Natural Science Foundation of He Nan Province Department of Education(2010B460011),He Nan Province Key Research Project(112102210105) .
Online since: May 2012
Authors: Lian Wang, Guang Yi Zhao, Man Zhang, Jian Qiang Lv, Yu Jun Hu, Kang Le Tian
And throughout the vast rural area and low prices of straw should be used as the ideal substitute resource Straw biogas process Through continuous exploration and research, at present, a representative of straw biogas production technology process is as follows : Straw crushing (original short 5 centimeters) → water wetting → plus straw fermentation wetting agents, ammonium bicarbonate, water → composting pre-fermentation (to adjust the PH value) → observe the growth of mycelium →bagging →into the pool→ plus inoculum (methane-producing bacterium, or liquid residue of biogas, various sludge, ammonium bicarbonate) →mixed with water →tank lid seal start (deflated) → use [3].
Straw unified gas engineering services Biogas plants for straw need professional centralized management, unified service, strengthen the straw gas service property management station construction, property management station to configure the transport machinery, mechanical access to materials, maintenance tools, and security detection equipment and other specialized equipment, training of professional staff and centralized gas users to conduct straw supply of raw materials, access to materials services, maintenance and safety checks, etc., so that straw biogas production process management standardization, to improve the effectiveness of straw gas use, quality and safety.
Online since: August 2013
Authors: Xin Wang, Li Jing Zhang, Xiao Yong Liu
The items of the research include the geological environment and subsurface water, adjacent buildings, around roads, underground pipeline and burying objects, water depth, flow velocity, sea level, weather of adjacent river, lake and coast, the environment, available construction site, etc.
The result of site investigation should be reviewed to identify the potential hazardous factors of construction environment by the security professionals, designers and construction crew.
Such as the water-caisson construction of Taizhou Bridge which was opened in 2012, its process flow was not worked out blindly.
Online since: October 2014
Authors: Li Qiang Tang
Its wide range of uses: such as intelligent transportation, environmental protection, the work of the government, public security, peace Home Furnishing, intelligent fire, industrial monitoring, water monitoring, food traceability, the enemy reconnaissance and intelligence gathering and other fields.
Involved in the logistics, information flow and capital flow in the process of integration of the logistics, including internal and external logistics in two parts, the internal logistics through the affected factors are less, through professional industrial engineering to logistics planning path and time, the master production schedule is stable for the ERP system (MPS) and material requirements planning (MRP) to provide reliable basic data.
But the disadvantage is the need for professional personnel and time-consuming to get relevant information, acquisition device through Internet of things (such as RFID) the start time of material processing and manufacturing process, the internal logistics down, get the ERP system basic data on real-time.
Online since: September 2013
Authors: Jian Xun Deng, Wei Hu
Such as in the aspect of legal support, construction developers must provide a "low energy prove” to consumers in the purchase or lease of housing, telling consumers residential heating, ventilation and hot water supply in the energy.
They also can put forward professional technology suggestion and motivate interaction between enterprises and other organizations.
Scientific research, education and professional qualifications.
Online since: December 2016
Authors: Xiu Hua Chen, Yu Dan Liang
Further, Yuzhong Gao thought [3] that the stone needle could not maintain the constant temperature and infrared ray effect when it was usually warned by hot water.
It needs different professional fields experts work together to research and develop.
For further research, we would like to search more professional information about needle technology to analyze the effect mode or technological process.
Online since: August 2015
Authors: M. Nazrin, Shajahan Maidin
However, they are not comfortable because they are not water proof and difficult to make movement.
Geomagic Studio is a platform that enables engineering and design professionals to create accurate digital model from any physical part.
Online since: July 2014
Authors: Ming Tong Ji, Chun Ying Zhang, Yu Dan Peng, Ting Ting Liu
Moreover, the cost of daily maintenance required is large and professionals are also required, which is not a small operation cost for travel operators.
They should choose environmental, green or ecological hotels with less energy consumption and form good habits of saving water and electricity.
Online since: November 2012
Authors: Melinda Godzsák, Zoltán Gácsi
In the first stage there is a 6-hour solid solution treatment at 530 ºC temperature and then the castings are intensively cooled down in water of 60-80 ºC temperature.
According to the professional literature [2] if the magnesium content of the alloy is solved it increases the value of lattice parameter.
Figure 8 illustrates G-P zones in different magnification rates. [4] Reading the professional literature we found photos where G-P zones can be seen more sharply but in these photos it is more difficult to see them in the matrix and their composition cannot be identified either. [5, 6] Figure 8: Photos of the Guinier-Preston zones Summary Our task was to find other heat treatment parameters to reduce the treatment periods and power consumption (530 ºC temperature - 6 hours and 210 ºC temperature – 3 hours).
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