中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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Iron oxide nanoparticles oxidize transformed RAW 264.7 macrophages into foam cells: Impact of pulmonary surfactant component dipalmitoylphosphatidylcholine 期刊论文  OAI收割
CHEMOSPHERE, 2022, 卷号: 300, 期号: 0, 页码: 134617
作者:  
Li, Haidong;  Tao, Xiaoqi;  Song, Erqun;  Song, Yang
  |  收藏  |  浏览/下载:151/0  |  提交时间:2022/11/08
天然林资源保护工程综合效益评价研究 学位论文  OAI收割
北京: 中国科学院大学;中国科学院生态环境研究中心, 2021
作者:  
杨师帅
  |  收藏  |  浏览/下载:20/0  |  提交时间:2022/06/22
气候变化的影响:温水青蛙还是灾难临头? 中文期刊论文  OAI收割
2015
作者:  
王劲峰
收藏  |  浏览/下载:28/0  |  提交时间:2015/12/18
Image deblurring with adaptive total variation model (EI CONFERENCE) 会议论文  OAI收割
International Conference on Image Processing and Pattern Recognition in Industrial Engineering, August 7, 2010 - August 8, 2010, Xi'an, China
作者:  
Zhang X.;  Zhang X.;  Zhang X.
收藏  |  浏览/下载:16/0  |  提交时间:2013/03/25
The novel facet coating technology for 808nm semiconductor laser (EI CONFERENCE) 会议论文  OAI收割
2010 Academic Symposium on Optoelectronics and Microelectronics Technology and 10th Chinese-Russian Symposium on Laser Physics and Laser Technology, RCSLPLT/ASOT 2010, July 28, 2010 - August 1, 2010, Harbin, China
作者:  
Liu Y.;  Qin L.;  Li Z.;  Li Z.;  Wang L.
收藏  |  浏览/下载:21/0  |  提交时间:2013/03/25
A novel facet coating technology is presented by studying catastrophic optical mirror damage mechanism of semiconductor laser. In this technology  semiconductor laser are cleaved in the air  and the surface oxide layer is removed with a low energy ion source  flowed immediately by coating the facet with thin ZnSe layer of 20 nm. The function of this layer is to protect semiconductor laser facet  and prevent impurity particles diffusing to the facet. Finally the facet is coated with oxidative optical film. The test results show that the output power of the semiconductor laser with the ZnSe coated layer is 13% higher than that of the Si coated layer  and 47% higher than that of the oxide coated film. The device coated oxide film is damaged when current is 4.5 A  and the device coated with Si layer is damaged when current is 5.5 A  the final failed device is coated with ZnSe layer. In conclusion  the method of coating ZnSe layer on the semiconductor laser facet can prevent effectively the catastrophic optical mirror damage  and increase the output power of semiconductor lasers. 2010 IEEE.  
Ultraviolet photodetector fabricated from atomic-layer-deposited ZnO films (EI CONFERENCE) 会议论文  OAI收割
Shan C. X.; Zhang J. Y.; Yao B.; Shen D. Z.; Fan X. W.; Choy K. L.
收藏  |  浏览/下载:24/0  |  提交时间:2013/03/25
Zinc oxide (ZnO) films have been prepared on glass substrate in layer-by-layer mode using an atomic-layer deposition (ALD) technique  and a metal-semiconductor-metal structured photodetector has been fabricated on the ZnO films employing interdigital Au as metal contacts. The photodetector shows a cutoff wavelength at around 390 nm and has an obvious responsivity in the whole UVA spectral range. Because the response of the ZnO photodetector covers the whole UV solar irradiation that can reach the earth  the photodetector promises to be useful in monitoring UV solar irradiation to protect people from harm caused by the solar irradiation. Furthermore  the capability of preparing large-area uniform ZnO films of ALD makes it favorable for possible mass production of this kind of photodetector. 2009 American Vacuum Society.  
All-solid-stated laser controller design based on digital optical feedback (EI CONFERENCE) 会议论文  OAI收割
Lasers in Material Processing and Manufacturing II, November 10, 2004 - November 12, 2004, Beijing, China
作者:  
Liu L.;  Wang J.-L.;  Wang J.-L.;  Liu L.
收藏  |  浏览/下载:26/0  |  提交时间:2013/03/25
The new design about a CW  digital all-solid-stated LD pumped Nd:YVO 4 controller is introduced. The stable output power of this digital laser controller which adopts Digital Signal Processor(TMS320C31) is approximately 20mW. The whole system is composed of constant- current source  protection circuit  pulse-width modulation circuit  Si-photo-detector and amplified circuit and Digital Signal Processor control system  etc. In terms of error deviation Based on nonlinear control curves of LD power output by Si-photo-detector  the region control can be obtained by means of the PID control algorithm in the software platform  that is  error amendment and high stability laser power output can be achieved. And the precision of temperature control can reduce from 0.2C to 0.04C. By adopted integral separated mode PID control algorithm  the LD output power instability ( %) down to 2%. By way of adopting the new digital design  the work to protect the laser diode  including the continuous adjustable output power with high accuracy and stability  is easily obtained. The internal-external modulation control of the laser power based on digital optical feedback can be accomplished with stable power output. At last  the bringing reasons of noise are analyzed and the solving methods are put forward in this paper.