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Online since: August 2003
Authors: Kunihito Koumoto, Yoshitake Masuda, Yan Feng Gao
Dielectric Characteristics of SrTiO3 Precursor Thin Film Prepared on Self-assembled Monolayers by the Liquid Phase Deposition Method Yanfeng Gao, Yoshitake Masuda, Kunihito Koumoto Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan Keywords: strontium titanate, amorphous, thin film, liquid-phase deposition method, dielectric property ABSTRACT We evaluated the dielectric properties of amorphous SrTiO3 precursor thin films in relation to the film thickness and morphology.
The intrinsic frequency dependence of material or the effects due to electrode or any internal interfacial barrier may induce such a resonance.
Koumoto, Key Eng.
Online since: December 2012
Authors: Quan Sheng Liu, Ke Duan Zhi, Run Xia He, Fang Wu, Ya Gang Zhang, Li Yang
Copper-Based Mixed Oxides Catalyst of Water-Gas Shift Reaction for Fuel Cells: The Role of Alkali Charge Keduan Zhi Quansheng Liu a Runxia He Fang Wu Yagang Zhang Li Yang Inner Mongolia Key Laboratory of Industrial Catalysis, Department of Chemical Engineering, Inner Mongolia University of Technology,Hohhot,P.R.
This is a structure weak material and was transferred to low surface area, and low intensity of solid solution, Cu1.5Mn1.5O4 and then to microcrystalline Cu and MnO, which resulted in poor catalyst activity.
Online since: September 2013
Authors: Guo Zheng Zhang, Zheng Yu Tian, Jin Jun Liu, Zhen Yu Fu, Li Li, Tao Li
Generally, lubricating grease has shorter service life than that of machinery parts[3] and overhaul cycles of many key types of equipment, such as aircraft, engine, locomotive, etc. are decided by the life of lubricating grease or oil.
Contamination concludes deposition or colloidal suspend material, polymer composites [5], outside contamination, wear debris, etc
[3] Z Xiang: Journal of naval academy of engineering, Vol.2(2005), p. 32
Online since: December 2012
Authors: Dian Ting Liu, Kai Hong Zhou
New CNC Machining Method for Sculptured Surface Using Non-ball-end Tools Zhou Kaihong1, a, Liu Dianting1,b 1 College of Mechanical and Control Engineering, GuiLin University of Technology, Guilin;Guangxi;541004; China a681023@163.com, b lliudian@163.com Keywords: Sculptured surface, CNC machining, Envelope–Approximation, Moving frame.
Introduction Sculptured or free-form surfaces are widely used in key manufacturing industries, e.g., aerospace, automotive, shipping, die and mold, etc, which machining is one of the most important technologies in manufacturing industries [1].
It may require more finish passes and each pass removes only a small amount of material.
Online since: February 2013
Authors: Ren Shan Zhuo, Jun Feng Cong, Ning Sun
Introduction As the key parts of the electro-optical theodolites, the surface shape of the primary mirror plays a critical role in the imaging quality of the optical system in the telescopes.
The parameters of the primary mirror The material of the flat-back form light weighted aspheric primary mirror is SiC, and the main physical properties are shown in table 1.
The finite element method (FEM) is developed widely in the engineering structural analysis recently.
Online since: October 2012
Authors: Jin Hua Wang, Jin Shan Zhang
Specification of turbulent diffusion by random walk method for oil dispersion modeling Jin-Hua Wang1, 2a, Jin-Shan Zhang1, b 1State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, 210024, China 2Institute of Severe Weather and Climate, School of Atmospheric Sciences, Nanjing University, Nanjing, China awjh6610@163.com, bzhangjinshan@vip.163.com Keywords: Oil spill modeling; random walk; diffusion Abstract.
The total probability of finding a particle over a rangeis then approximately, the material contained within this range would be, from which the concentration distribution is (4) If we suppose that the particles suffer n displacements per unit time; then and becomes a kind of ‘diffusion velocity’, define diffusivity , we can transform equation into (5) This is exactly the one-dimensional diffusion from the classical diffusion equation, a Gaussian distribution with standard deviation.
Online since: May 2010
Authors: Herbert F. Schweinzer, Georg Kaniak
Principles for Echo Position Determination Using Airborne Ultrasound Georg Kaniak a , Herbert Schweinzer b Vienna University of Technology Institute of Electrodynamics, Microwave and Circuit Engineering Gusshausstrasse 25/354, A-1040, Vienna, Austria a georg.kaniak@tuwien.ac.at, b herbert.schweinzer@tuwien.ac.at Keywords: Ultrasound, Angle Determination, Scene Analysis Abstract.
One key element for the accuracy of echolocation systems is the echo detection.
Siegfried Bauer and Petr Bartu from the Institute of Experimental Physics, Johannes Kepler University, Linz for their continued support in providing material for our receivers based on ferro-electret foil.
Online since: December 2010
Authors: Hao Liang Jiang, Ri Hui Liu
Experimental Study on Inner Reinforced Concrete-Block Composite Shaft Lining Haoliang Jiang 1,2, a, Rihui Liu3 1 Mine Construction Branch of China Coal Research institute, Beijing, 100013, China 2 Beijing Mining Branch of China Coal Research institute, Beijing 100013, China 3Beijing China Coal Mine Engineering Company, Limited., Beijing, 100013, China ajhaol@163.com Keywords: Concrete-Block Composite Shaft Linin; Model Test; Freeze Sinking Method Abstract.
Table 1 the parameter of out block shaft lining Test NO. geometry size (mm) Parameter of block Outer diameter Inner diameter height material strength mortar 1 1500 1300 500 concrete C50 M10 2 1470 1270 500 concrete C50 M7.5 3 1470 1270 500 concrete C50 M7.5 4 1470 1270 500 concrete C50 M5 Table 2 the parameter of inner reinforced concrete shaft lining Test NO. geometry size (mm) Concrete strength requirements of second loading stage Outer diameter Inner diameter height 1 1300 1070 500 35MPa 2 1270 1070 500 30MPa 3 1270 1070 500 30MPa 4 1270 1070 500 30MPa Fig. 1 structural diagram of shaft lining Manufacture of test model shaft lining Block was made of 52.5R ordinary portland cement,geometry size was show as Fig.2.block concrete cubic compressive strength is 53.15Mpa.
Acknowledgements This study is funded by National Key Technology R and D Program for the 11th five-year plan (No.2008BAB33B03) References [1] Hong Boqian.
Online since: August 2013
Authors: Meng Yan, Yuan Yuan, Xiang Lin Zeng, Yong Qing Yang
Research on Loading Test Scheme of Vehicular Bridge-Footbridge Combined Double-deck Cable-stayed Bridges Yan Meng a,Yang Yongqing b,Yuan Yuan c,Zeng Xianglin c School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China a511324910@qq.com, byangyongqingx@home.swjtu.edu.cn,c1009068131@qq.com Keywords: double-deck cable-stayed bridge; footbridge; vehicular bridge; loading scheme; dynamic load test; static load test; coupling effect Abstract: In order to check whether the bridge structure is in good working condition, meeting the requirements of carrying capacity and traffic capacity, loading test should be conducted to the Huiketing No.1 Bridge in Mianyang city.
These key sections should be adopted for loading test including centric loading test and eccentric loading test.
Fig.  6 Arrangement for the dynamic deflection measure point and vibration shape measure points on the vehicular bridge [cm] Conclusions As there are always considerable differences between the real structure and the theoretical calculation model in terms of material properties, structural performances and so forth, loading test is one of the most direct ways in scientific research to get a thorough comprehension on the working state of a real bridge.
Online since: July 2013
Authors: Yu Mei Ding, Hua Yan, Peng Jiang, Zhen Zhang, Wei Min Yang
Simulation of Circular Tubes Fitted With V Cut and Square Cut Rotors Peng Jiang1,a, Hua Yan1,b, Zhen Zhang1,c, Yumei Ding1,d, Weimin Yang1,2,e* 1College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China 2State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China aJiangpeng8712@163.com, bYanhua999@vip.sina.com, czhangzhen81040774@163.com, ddingym@mail.buct.edu.cn, eyangwm@mail.buct.edu.cn Keywords: Rotors; Simulation; Heat transfer; Friction factor; Thermal performance factor Abstract.
All of the rotors used were made of polymer material which has a density very close to water so that rotors can almost suspend in still water, which is helpful for the automatic centering of rotors in a tube.
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