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Online since: September 2011
Authors: Pin Wu Guan, Meng Chen
Experiment background material and theoretical basis can be applied in engineering application [1,2].
According to materials-Tensile testing at ambient temperature>(GB/T 228-2002), the yield strength, ultimate tensile strength, elastic modulus and elongation are all tested in Table1.
Li: Journal of Zhengzhou University (Engineering Science) , Vol. 29 (2008) No.2, p.18.
Online since: October 2011
Authors: Wei Lu, Qing Chun Yang, Ping Li
A numerical sensitivity analysis to bentonite parameters for a long term geochemical evolution of a HLW repository in clay Qingchun Yang1, 2, a, Wei Lu 3, b, Ping Li 4,c 1 Escuela de Ingenieros de Caminos, Universidad de A Coruña, Campus de Elviña, 15192, A Coruña, Spain 2 State key Laboratory of Water Resources and hydropower Engineering Science, Wuhan University, Wuhan, 430072, China 3 Guangzhou Institute of Geography, Guangzhou, 410070, China 4 School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China a qyang@udc.es, b lujingyi2971@yahoo.com.cn, c liping_0224@163.com Keywords: Numerical model, sensitivity analysis, high-level radionuclide waste, bentonite Abstract.
Bentonite is commonly selected as a clay barrier material.
Fig. 1 Scheme of a multibarrier system for a Fig. 2 1-D finite element grid with node number (top) and potential HLW repository in a clay formation element number (below) (ENRESA, 2004) Conceptual model Three material zones are considered in the model: 1) bentonite with 0.75 m for the radial thickness, 2) a 0.3 m concrete sustainment and 3) the clay formation with a thickness about 23.5 m.
Material Hydraulic conductivity (m/s) Initial porosity Effective diffusion coefficient (m2/s) Bentonite 2.75·10-14 0.407 1.66·10-11 Concrete 3.39·10-12 0.085 1.83·10-10 Clay 4.19·10-12 0.37 5.01·10-11 Table 2 Cation exchange reactions and selectivity coefficients in bentonite and clay Cation exchange reactions Bentonite Clay KX + Na+ Û NaX + K+ KNa/K = 0.094 KNa/K = 0.013 0.5 CaX2 + Na+Û NaX + 0.5 Ca+2 KNa/Ca = 0.279 KNa/Ca = 0.081 0.5 MgX2 + Na+Û NaX + 0.5 Mg+2 KNa/Mg = 0.306 KNa/Mg = 0.200 HX + Na+ Û NaX + H+ KH/Na = 3.16·10-5 KH/Na = 3.16·10-5 Model results This paper is aiming at analyzing the sensitivity of geochemical evolution to bentonite parameters.
Arcos, et al.,: Journal of Contaminant Hydrology, vol. 102 (2008) p. 196–209
Online since: April 2015
Authors: Bahareh Haddadi
The piezoelectric devices (PZD) is used for simulating piezoelectric substrate material, and LiNbO3 is used as a substrate in the simulation.
Springer, Science, 324 (2009) 1330–1334
Cooper, Advanced Materials, 23(2011) 1458–1462
Chang, Journal of Applied Physics, 98 (2005) 024903
Online since: March 2004
Authors: Ho Jung Chang, Sang Woo Joo, Cheng Zhu Lu, Dong Un Seo
Introduction Since optical, magnetic, and electronic properties of semiconductors can vary sensitively depending on dimensions, the ability to prepare nanoparticles of any desired size will open significant opportunities in material science [1].
Understanding of the adsorption of organic molecules on semiconductor surfaces should be important, considering that the ability to tailor the properties by self-assembled monolayers can provide a new a functionality of materials.
Our 250 300 350 0.0 0.2 0.4 0.6 (a) Absorbance Wavelength(nm) 250 300 350 0.0 0.2 0.4 0.6 (b) Absorbance Wavelength(nm) Journal Title and Volume Number (to be inserted by the publisher) results indicate that alipathic isocyanides such as pentyl and butyl isocyanides adsorb on ZnO nanoparticle surfaces to arrest the growth.
Online since: November 2012
Authors: Guang Xia Ma, Jin Kun Sun, Min Cheng
Comprehensive evaluation A Technical evaluation B1 Price quotation evaluation B2 Qualification and reputation B3 Main construction scheme C1 Construction schedule C2 quality C3 Equipment,material,staff C4 Overall price quotation C5 Unit price of main item C6 Qualification and finance C7 Achievements and reputation C8 Subcontractor D1 Subcontractor D2 Subcontractor D3 Fig .1.
Table 7 .The value of index of each construction enterprise Enterprise Index D1 D2 D3 Construction scheme 9 8 9 Schedule and time limit 90 97 100 Quality 8 7 8 Equipment, material and staff 9 7 8 Tender sum 86 73 67 Unit price of material 8 8 7 Qualification and finance 9 8 8 Achievements and reputation 8 9 9 Judgement matrix(omitted) is built through the same method, and eigenvector can be calculated
International Journal of Project Management.2001,19(1),P19~27 [3] Weishan Yang, Coastal Enterprises and Science & Technology Vol.10 (2006), p.71 [4] Qiyuan Jiang.Jinxing Xie.Jun Ye Mathematical Model [m] Beijing.
Online since: July 2013
Authors: Zheng Lu, Li Ping, Gao Ji, Zhang Di
Visual Experiment and Analysis of Erythrocyte High-SpeedCollision in Microchannel Lu Zheng1,a, Ping Li2,b, Ji Gao2,c, Di Zhang1,d,* 1Key Laboratory of Thermal-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an, 710049, P.
Lampert et al. [4] carried on the research on the effect of the surfaces of metal and plastic on hemolysis caused by shear stress and reported affinity between the material’s surface energy and its effect on hemolysis.
Williams, Effect of surface materials on shear- induced hemolysis, J.
Liu, et al., Numerical Investigation on Flow Field and Biocompatibility of an Axial Blood Pump, Journal of Xi’an Jiaotong University. 40 (2006) 1290-1294.
Online since: March 2010
Authors: Shuai Dong, Gao Song Wang, Zhi Hao Zhao, Jian Zhong Cui
As early as the 1970s and 1980s, the United States, Switzerland and other countries have achieved 5-7 ingot electromagnetic casting while China started late. [1-2] From the end of the 20th century, in order to grasp multi-flow technology as soon as possible in aluminum foundry industry in China, a research program of dual-ingot electromagnetic casting was carried out by North China University of Technology, Beijing University of Science and Technology and other research universities.
For the material physical parameters, see Table 1.After meshing, the model can be applied in the current load and boundary conditions, that is, current density which is determined by current value, the coil turns and its sectional area, is loaded on induction coil; define the outermost air as the far-field unit and give far-field signs so as to describe far-field dissipation of electromagnetic field.
Regardless of current direction, the magnetic field density on the remote end should be greater than that on the proximal of the same Table 1 Parameters for the computation of electromagnetic field Materials Relative Permeability Resistivity (Ω·m) ingot 1.0 2.59×10-7 casting mould 1.0 1.07×10-7 coil 1.0 1.7×10-8 shield 1000 1.0×10-6 air 1 0 far-field air 1 0 ingot.
Journal of North China University of Technology.
Online since: July 2014
Authors: Na Guo, Shi Wang Yu
Project portfolio Preliminary qualification Project analysis Appraisal and check Optimized portfolio Adjustment Knowledge bank Implementation Evaluation Project portfolio completion Enterprise strategy Proper method Figure 1 Project Portfolio Selection Process Project proposal preliminary qualification There are many kinds of project proposals, such as the construction tender from construction market, own projects in construction enterprise itself, maintenance and change of construction equipment and so on. 1) After identifying the project chances, the project proposer prepare material and record the details of the project like interest and cost and so forth; 2) According to the project preliminary template and standard made by the enterprise project portfolio management office, every proposal should be check carefully under the enterprise strategy and those disqualified projects will be rejected, which will help to save
With the help of operational science and following the selection standard and indicators, a group of optimized project portfolio will be selected.
International Journal of Project Management, 28(8), 818-831
Applied Mechanics and Materials,357, (2013), 2238-2241
Online since: July 2014
Authors: Hai Bo Lun, Yi Ting Zhang
During this process a great amount of chemical raw materials such as: pulp, caustic soda, sulfuric acid and CS2 are needed, thus leaving a lot of wastewater which will threaten the environment with various sulfuric acid, carbon disulfide, zinc sulfate, cellulose, dissolved organic matter and so on.
Air Blow Nutrient Salt Secondary Sedimentation Tank Recycling Sludge Sludge Inflow Fig.1 Bjectification and Biochemistry of Wastewater Process Flow Diagram The Upgrading Processing of Wastewater More manpower and material resources are required in the operation management due to the implementation of biochemical system in the traditional techniques mentioned above.
References [1] Quan Yuan,Bin Sun..Journal of Filtration&Separation,2005,15(1):31-33(In Chinese) [2] Wenyi Duane,Yu Bai,Yafeng Li.Coal Mine Environmental Protection,2001,15(5):46-48(In Chinese) [3] Liang Chen,Shaoning Lin,Runa Huang,Shanghai Enviromental Sciences,1994,13(8):15-18(In Chinese)
Online since: May 2013
Authors: Pan Zeng, Wen Bin He, Feng Lin
Finite Element Analysis for 40 MN Die Forging Press Wenbin He1,2,3,a, Pan Zeng1,2,b, Feng Lin1,2,c 1Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China 2Key Laboratory for Advanced Materials Processing Technology, Ministry of Education of China, Beijing, 100084, China 3Department of Electromechanical Science and Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan, 450002, China ahwb08@mails.tsinghua.edu.cn, bzengp@mail.tsinghua.edu.cn, clinfeng@mail.tsinghua.edu.cn Keywords: Die forging press, Finite element analysis, Bumpy-ridge, Main frame winding Abstract. 40 MN multi-cored die forging press is a bi-directional loading press machine designed by Tsinghua University.
The material of the main frame and other components is chosen as Q345, the Young’s modulus, Poisson’s ratio, and yield strength are 210 GPa, 0.3, and 345 MPa, respectively.
Sun: Journal of Mechanical Engineering, Vol. 48 (2012), p. 13 [2] W.