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Online since: February 2012
Authors: Xiao Liu Liu
Design and technology of all-welded Longitudinal Seam sand control liner Xiaoliu Liu School of Material and Engineering, Xi^an Shiyou University, Xi’an 710065, China xlliu@xsyu.edu.cn.
Key words : wire wrapped screen; longitudinal seam pipe-type screen; The application of slotted liner; sand control Abstract : The new longitudinal seam pipe-type screen is designed, in order to avoid wire disorder and damage of wire wrapped the screen passes the bending zone in the heavy in dined well or horizorital well.
Online since: May 2011
Authors: Bo Wang, Ze Deng, Meng Geng, Gui Zhong Li
Table 1 Sensitivity Analysis Data Sheet Range Key parameters Upper value Medium value Lower value Young’s modulus (Mpa) 9000 5000 2000 Langmuir Volumetric strain (dimensionless) 0.02 0.011 0.002 Initial saturation (%) 100 80 50 Young’s modulus is a physical quantity which characterizes material tensile or compression resistance within the elastic limit.
Q. , Durucan, S., 2005 : “A model for changes in coalbed permeability during primary and enhanced methane recovery”, SPE Reservoir Evaluation & Engineering.
Online since: August 2012
Authors: Xue Bin Hong, Cong Zhang, Ya Quan Wang
R. of China bKey Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P.
Briefly, a piece of metallic Ni sponge (BET surface area 0.25 m2/g, 80 % porosity, Changsha Liyuan Material Co., Ltd.) was cut into 40-60 mesh, treated with a mixture of 500 cm3 containing 0.01 wt. % HCl and 0.2 wt. % H2SO4 for 24 h, and then thoroughly washed with distilled water and dried.
Acknowledgement The financial supports by the Key project of Tianjin Natural Science Foundation under Grant No. 07JCZDJC00200 and the National High Technology Research and Development Program of China (863 Program) under Grant No. 2007AA05Z104 and 2006AA05Z115 are gratefully acknowledged.
Online since: December 2013
Authors: Bao Hong Lu, Chang Jun Qi
Study of the temporal and spatial distribution of water temperature in Ertan Reservoir based on prototype observation Qi Changjun1,2,a, Lu Baohong3 1Appraisal Centre for Environmental and Engineering,Ministry of Environmental Protection, Beijing 100012, China 2State Environmental Protection Key Laboratory of Numerical Modeling for Environment Impact Assessment, Beijing 100012, China 3College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China aqcj882@126.com Keywords: Ertan reservoir; mathematical model; prototype observation; water temperature distribution Abstract: When a reservoir is built, it will change the hydraulic features of the natural river, and cause thermal stratification which has significantly influence on the reservoir area and downstream ecological environment.
Temperature measurement range: 0 to 40˚C; Accuracy: ±0.1˚C; Resolution: 0.01˚C Field data shows that the prototype observation programme above not only reflects the spatial variation regularity of water temperature in front of the dam, but also provides reliable and material data for the study of water temperature prediction models and formulae.
Online since: December 2005
Authors: R. Jones, Patrick R. Briddon, A. Carvalho, Vitor Torres, J. Coutinho
Introduction The key role of ion implantation in achieving nano-scale doping features in the fabrication of Si-based modern devices has lead to a heightened interest in the defects produced from these processes.
Recently, the W- and X-lines have been detected in both proton and Si-ion implanted natural (natSi) and 30Si enriched material, subsequently annealed around 500◦C.
¨Oberg: Proceedings of the European Network on Defect Engineering of Advanced Semiconductor Devices, (Stockholm, 2000)
Online since: June 2014
Authors: Zheng Min Wen, Xue Feng Yang, Shu Jing Wei
In the field of urban and rural planning, a number of scholars research on the theories and methodologies of low-carbon campus, for example, Yuxiong Li does study on the transportation system planning and comprehensive use of water resource in campus [1], Zisong Wang has proposed his strategy about energy using, material saving and water saving in campus [2], and Jing Zhou as well as Zheng Yao has done relative researches [3,4,5].
The site plan directly guides the design of all buildings and engineering facilities in campus, and it is the practical sessions which presents the low-carbon construction as well as energy saving and emission reduction in campus [6].
Acknowledgement This research was financially supported by Guangxi key discipline--Urban Planning and Design.
Online since: August 2013
Authors: Li Qiang, Bin Zhang, Xiao Ling, Jun Yan Zhang
Impacts of N2 import into reaction system on the structures and properties of the graphite-amorphous carbon films Bin Zhang1,a, Li Qiang1,b, Xiao Ling2,c, Junyan Zhang1,d 1 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China; 2 School of Petroleum Chemical Engineering, Lanzhou university of technology, Lanzhou 730050, PR China abzhang@licp.cas.cn, b qiangli163@163.com, c332820859@qq.com Keywords: amorphous carbon films, Mechanical properties, Elastic, Friction coefficient Abstract.
As discussed in our previous work [9], the N2 flow ratio increase while the CH4 decrease, carbon source for the carbon material growth reduces and nitrogen-ion bombardment becomes stronger and stronger, nevertheless in Ni target surface or in the Si substrate.
Online since: May 2014
Authors: Xiao Mei Zhang, Hong Zhan Li, Man Li Cao, Chao Yue Chen
Synthesis, Adsorption Behavior of a Maleamic Acid Cross-linked β- Cyclodextrin Polymer for Removal of Basic Fuchsin in Aqueous Solution Xiao-mei ZHANG*, Hong-zhan LI, Man-li CAO, Chao-yue CHEN Department of Chemical and Engineering, Anhui University of Science and Technology, Shungeng Middle Road 168, Huainan 232001, Anhui, People’s Republic of China.
As a kind of potential efficient adsorption material used to remove organic pollutants from water, water-insoluble β-cyclodextrin (β-CD) based polymers have developed fast in the pass two decades [6-16], due to their properties of forming inclusion complexes with a wide variety of organic compounds in β-CD hydrophobic cavity and existing non-inclusion binding sites within framework of the polymers [17].
The adsorption parameters for Freundlich and Langmuir’s isotherm at different temperatures Model Parameters Temperature /K 288 298 308 Freundlich KF 9.090 8.736 8.535 1/n 0.2616 0.2932 0.3412 R2 0.922 0.931 0.920 Langmuir Qma /mg.g-1 26.34 29.33 33.56 KL/L×mg-1 0.326 0.229 0.200 RL 0.133 0.179 0.200 R2 0.999 0.995 0.993 Qmb /mg.g-1 25.47 28.08 31.51 Qma : calculated values ; Qmb : experimental data As displayed in Fig.6, Fig.7 and Table 1, adsorption equilibrium data of BF at different temperatures under the concentration range studied fitted the Langmuir’s model well, with the correlation coefficients of R2 > 0.993 and the small deviation of Qm between calculated and tested data, which suggested that some homogeneity in the surface of PCD would play a key role in BF adsorption and the adsorption of BF on to PCD would be a monomolecular layer adsorption.
Online since: December 2014
Authors: Yang Lu, Xing Lai Ge, Ya Fei Wang, Yong Xin Li
Characteristic Performance Analysis of Traction Motor on EMU with Broken Bars Using FEM Yongxin Li1,a,Yafei Wang1,b,Xinglai Ge1 ,Yang Lu2 1Electrical Engineering School of Southwest Jiaotong University, Chengdu, 610031, China 2Locomotive & Car Research Institute, China Academy of Railway Sciences, Beijing, 100081, China amingfengzhige@163.com,bgaichuguile@163.com Keywords: traction motor in EMU; broken-bar fault; magnet field in motor; characteristic components; finite element method (FEM).
Since traction motor is one of the key parts in EMU, it’s significant to study the fault identification.
Fundamental Equation The 2-D model of the motor is employed, and the fundamental equation describing the space and time variations of the vector potential over the region of analysis is shown as following: (1) Where D is the region of analysis, Γ1 is the outside circumferential of the stator and inside circumferential of the rotor (the Dirichlet boundary conditions), Jz is the axial current density, σ is the conductivity of the conductors, Az is magnetic vector potential, μ is the permeability of the material.
Online since: June 2017
Authors: Juan Mentado-Morales, Ever Peralta-Reyes, Carlos Estrada-Vázquez, Gerardo Martínez-Villa, Mario E. Cordero, Luis G. Zárate, Alejandro Regalado-Méndez
The use of this experimental design methodology is very economical, allows extraction of the maximum amount of complex information, and saves on significant experimental time, material used for analyses and personnel cost.
Response Surface Methodology (RSM) RSM is a collection of statistical and mathematical methods that are useful for the modeling and analysis of engineering problems.
By using RSM, it was possible to study the effect of key parameters on biodiesel yield.
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