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Preparation of basic magnesium carbonate and its thermal decomposition kinetics in air 期刊论文  OAI收割
JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY, 2011, 卷号: 18, 期号: 6, 页码: 1865-1870
作者:  
Liu Xin-wei;  Feng Ya-li;  Li Hao-ran
收藏  |  浏览/下载:24/0  |  提交时间:2013/10/29
Structure buckling load interval analysis of supercavitating projectile (EI CONFERENCE) 会议论文  OAI收割
2011 9th International Conference on Reliability, Maintainability and Safety: Safety First, Reliability Primary, ICRMS'2011, June 12, 2011 - June 15, 2011, Guiyang, China
作者:  
Zhou L.
收藏  |  浏览/下载:26/0  |  提交时间:2013/03/25
As a result of supercavitating projectiles with high underwater velocity  their structures undergo high longitudinal force. It is necessary to perform structure buckling load interval analysis because the uncertainty of structural own parameters should be considered. Critical buckling load of supercavitating projectiles is calculated by Galerkin method. The partial matrixes of critical buckling load implicit function to each uncertainty variable are deduced  and the interval of structure critical buckling load is calculated by interval analysis and convex model methods. Numerical results show that the nominal value  lower and upper bounds of critical buckling load increase with the increment of the ratio of base diameter to cavitator diameter. And the uncertainty degree of basic variables should be controlled as far as possible in the project for high reliability. 2011 IEEE.  
A spherical catadioptric telescope system based on Cooke corrector group (EI CONFERENCE) 会议论文  OAI收割
Novel Optical Systems Design and Optimization XII, August 3, 2009 - August 4, 2009, San Diego, CA, United states
作者:  
Zhang J.;  Liu W.;  Zhang J.;  Zhang J.
收藏  |  浏览/下载:31/0  |  提交时间:2013/03/25
To obtain a number of advantages in fabrication  testing and alignment  many designs in which spherical mirrors replace classical Cassegrain-form aspheric mirrors are present in the literature. However  spherical mirrors suffer from substantial spherical aberration and thereby require some form of corrector group. But in this case  the question encountered is that of making the basic optical configuration more complex. In this paper  a new design based on Cooke corrector group is presented for eliminating spherical aberration  which is believed to provide higher performance with less complexity than previous approaches. Besides  the cost and fabrication period will be extremely decreased. The telescope system using corrector group here can achieve good optical performance with f# of 10  full field of 0.5  obscuration of 1/3 and MTF (Modulation Transfer Function) of 0.48 corresponding to 50@lp/mm. 2009 Copyright SPIE - The International Society for Optical Engineering.  
The theoretical research of basic function method in incompressible viscous flow and its simulations in three-dimensional aneurysms 期刊论文  OAI收割
Science in China Series G-Physics Mechanics & Astronomy, 2009, 卷号: 52, 期号: 6, 页码: 909-918
Shen, F.; Wu, W. Y.
收藏  |  浏览/下载:30/0  |  提交时间:2014/04/30
3-D correlation imaging for gravity and gravity gradiometry data 期刊论文  OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2009, 卷号: 52, 期号: 4, 页码: 1098-1106
Guo, LH; Meng, XH; Shi, L; Li, SL
收藏  |  浏览/下载:37/0  |  提交时间:2011/07/03
The spectral feature analysis of semiconductor thin disk laser (EI CONFERENCE) 会议论文  OAI收割
Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China
作者:  
Li J.;  Wang L.-J.;  Wang L.-J.;  Ning Y.-Q.;  Li J.
收藏  |  浏览/下载:24/0  |  提交时间:2013/03/25
The semiconductor thin disk laser is a new type of semiconductor laser. This work gives the basic operation function of semiconductor disk laser  and analyses the heat effect by the experimentally measured photoluminescence spectrum of the laser chip at different pump power and different temperature. We can see that: with increasing pump power  the thermal effects of the gain material becomes seriously and causes the saturation of carrier lifetime  so the electron-hole pair created in the absorbtion layer have no enough time to rate to one of the wells  and the non-radiative recombination happens in the barrier. When the thermal effects becomes stronger  the chip will not lasing. This phenomenon is from the smaller energy offset between barrier and quantum well. We optimize the original structure design and experimental technology. A non-absorbing AlGaAs layer who is transparent to the pumping and laser wavelength is added to confine the carriers in the quantum wells. At the same time a DBR with double reflecting band is induced to improve the absorbing efficiency of the pumping light. The single QW is replaced by the three narrow QWs  This three QWs structure can add the quantum state of QW  increase the recombination probability of carriers in the QWs and reduce the heat effect. The chemical etch equipment is also improved to control the surface unevenness to be within 50 nm.  
New Type of Basic Functions of FEM in Application to Solution of Inverse Heat Conduction Problem 期刊论文  OAI收割
JOURNAL OF THERMAL SCIENCE, 2002, 卷号: 11, 期号: 2, 页码: 163,171
Michael J. CIALKOWSKI
收藏  |  浏览/下载:6/0  |  提交时间:2013/03/12