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Migration of carbon dioxide in sandstone under various pressure/temperature conditions: From experiment to simulation 期刊论文  OAI收割
GREENHOUSE GASES-SCIENCE AND TECHNOLOGY, 2022, 页码: 16
作者:  
Xu, Liang;  Li, Qi;  Myers, Matthew;  White, Cameron;  Cao, Xiaomin
  |  收藏  |  浏览/下载:76/0  |  提交时间:2022/04/11
Effects of elevated CO2 on plant C-N-P stoichiometry in terrestrial ecosystems: A meta-analysis 期刊论文  OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2019, 卷号: 650, 页码: 697-708
作者:  
Du, Chenjun;  Wang, Xiaodan;  Zhang, Mengyao;  Jing, Jie;  Gao, Yongheng
  |  收藏  |  浏览/下载:78/0  |  提交时间:2018/10/10
Effects of elevated CO2 on plant C-N-P stoichiometry in terrestrial ecosystems: A meta-analysis 期刊论文  OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2019, 卷号: 650, 页码: 697-708
作者:  
Chenjun Du;  Xiaodan Wang;  Mengyao Zhang;  Jie Jing;  Yongheng Gao
  |  收藏  |  浏览/下载:151/0  |  提交时间:2018/11/07
Space camera imaging gain in-orbit adjusting strategy (EI CONFERENCE) 会议论文  OAI收割
2009 2nd International Conference on Intelligent Computing Technology and Automation, ICICTA 2009, October 10, 2009 - October 11, 2009, Changsha, Hunan, China
作者:  
Wang J.;  He X.
收藏  |  浏览/下载:17/0  |  提交时间:2013/03/25
A Multi-Step Gain Adjusting Strategy (MSGAS) of space camera was proposed  which was used to get higher SNR (Signal-Noise Rate) image. When the space camera working in poor light condition  the CCD signal was so weak that it's difficult to get a clear image  to reduce the quantization noise and improve the SNR  we must amplify the CCD signal first and then quantize. The MSGAS was achieved by adjusting the gain of the CCD (Charge Couple Device) signal processor step by step  the upper limit and lower limit were set  if the MDN (Mean Digital Number) of a fixed length image data was not between the lower and upper limit  the gain was adjusted step by step. In the experiment  the upper limit  lower limit and the step were set  and the result of the experiment showed that MSGAS was robust and SNR was improved from 28 to 39. 2009 IEEE.  
Temperature characteristics of high power vertical cavity surface emitting lasers (EI CONFERENCE) 会议论文  OAI收割
Semiconductor Lasers and Applications III, November 12, 2007 - November 13, 2007, Beijing, China
作者:  
Qin L.
收藏  |  浏览/下载:29/0  |  提交时间:2013/03/25
By using oxidation confinement technology high power vertical-cavity surface-emitting lasers are fabricated in experiment. The electrical and optical performance characteristics such as threshold current  efficiency  emission wavelength  and output power are measured under continuous wave (CW) condition at room temperature. The maximum output power is up to watt regime at wavelength of about 980nm. The temperature characteristics of the device are investigated experimentally in detail. The variation in lasing threshold current with temperature is studied. The characteristic temperature T0 of the device is derived  and the value is about 211K. Such a high characteristic temperature T0 of threshold current can lead to good temperature sensitivity of the device. At the same time  the lasing spectrum characteristics with temperature are also measured. The wavelength shift with temperature is just about 0.06nm/K. From the measured results  it is shown that the device can still operate at high temperature condition.  
Using one-dimensional nonlinear photonic crystal for dynamical addressing optical interconnection (EI CONFERENCE) 会议论文  OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者:  
Li C.;  Wang W.;  Wang W.;  Li C.;  Li C.
收藏  |  浏览/下载:34/0  |  提交时间:2013/03/25
Optical interconnection is the key technique of high-speed optical information process and optical communication. A lot of approaches for optical interconnection have been proposed since Goodman in Stanford University firstly proposed the optical interconnection for very large scale integrated circuits technology. A dynamical addressing device for optical interconnection was designed and fabricated in this paper. This optical device is based on one-dimensional nonlinear photonic crystal made on the planar waveguide. The nonlinear materials ZnS and ZnSe  which have large nonlinear refractive index coefficients  were alternately deposited on the waveguide to form one-dimensional photonic crystal. The Bragg condition is changed when the input power of the control light increased due to the nonlinear characters of the materials  thus the reflective angle of the signal light can be changed with the input power change of the control light. In our experiment  when increasing the power density of control light from 0 to 2.60X105W/cm 2  the angle of the signal beam can be changed about 20. The interconnection characteristics were investigated in theory and in experiment. The testing data agree well with theoretical predictions. This kind of devices is promising to use in the all-optical interconnection  optical information processing and optical communication.