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Chinese Academy of Sciences Institutional Repositories Grid
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MPM formulations for the coupled thermo-hydro-mechanical behaviour of saturated and unsaturated soils 期刊论文  OAI收割
COMPUTERS AND GEOTECHNICS, 2024, 卷号: 170, 页码: 24
作者:  
Zhan, ZQ;  Zhou, C;  Liu CQ(刘传奇);  Du, J T
  |  收藏  |  浏览/下载:23/0  |  提交时间:2024/07/04
A timing detector with pulsed high-voltage power supply for mass measurements at CSRe 期刊论文  OAI收割
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2014, 卷号: 755, 页码: 38-43
作者:  
Zhang, W;  Tu, XL;  Wang, M;  Zhang, YH;  Xu, HS
  |  收藏  |  浏览/下载:27/0  |  提交时间:2017/03/28
Nitrogen deposition weakens plant-microbe interactions in grassland ecosystems 期刊论文  OAI收割
GLOBAL CHANGE BIOLOGY, 2013, 卷号: 19, 期号: 12, 页码: 3688-3697
作者:  
Wei, Cunzheng;  Yu, Qiang;  Bai, Edith;  Lu, Xiaotao;  Li, Qi
  |  收藏  |  浏览/下载:4/0  |  提交时间:2023/04/25
The compensation of quadrupole errors and space charge effects by using trim quadrupoles 期刊论文  iSwitch采集
Science china-physics mechanics & astronomy, 2011, 卷号: 54, 页码: S214-s217
作者:  
An YuWen;  Wang Sheng
收藏  |  浏览/下载:28/0  |  提交时间:2019/04/23
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:25/0  |  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.  
How do nitrogen inputs to the Changjiang basin impact the Changjiang River nitrate: A temporal analysis for 1968-1997 SCI/SSCI论文  OAI收割
2003
Yan W. J.; Zhang S.; Sun P.; Seitzinger S. P.
收藏  |  浏览/下载:31/0  |  提交时间:2012/06/08