中国科学院机构知识库网格系统: 检索

Plutonium isotopes in Northern Xinjiang, China: Level, distribution, sources and their contributions 期刊论文 OAI收割
ENVIRONMENTAL POLLUTION, 2020, 卷号: 265, 页码: 11
作者: Zhao, Xue; Qiao, Jixin; Hou, Xiaolin

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Pu-239,2(40) Cs-137 Radioactive pollution Nuclear weapons testing Northern Xinjiang

Impact of North Korean nuclear weapons test on 3 September, 2017 on inland China traced by C-14 and I-129 期刊论文 OAI收割
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, 2018, 卷号: 316, 期号: 1, 页码: 383-388
作者: Hou, Xiaolin; Cheng, Peng; Liu, Qi; Fan, Yukun; Chen, Ning

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收藏 | 浏览/下载：30/0 | 提交时间：2018/09/25

North Korea Underground Nuclear Weapons Test C-14 I-129 Environmental Impact Aerosol

Impact of North Korean nuclear weapons test on 3 September, 2017on inland China traced by 14C and 129I 期刊论文 OAI收割
Journal of Radioanalytical and Nuclear Chemistry, 2018, 卷号: 316, 期号: 1, 页码: 383–388
作者: Zhang, LY(Zhang, Luyuan); Hou, XL(Hou, Xiaolin); Cheng,P(Cheng, Peng); Chen, N(Chen, Ning); Fan, YK(Fan, Yukun)

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North Korea Underground Nuclear Weapons Test 14c 129i Environmental Impact Aerosol

Beam combining of high energy fibre lasers 期刊论文 OAI收割
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering, 2018, 卷号: 47, 期号: 1
作者: Cheng, Xue; Wang, Jianli; Liu, Changhua

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收藏 | 浏览/下载：15/0 | 提交时间：2019/09/17

High energy lasers Directed-energy weapons Fiber lasers Fibers Laser beams Single mode fibers

High-density native-range species affects the invasive plant Chromolaena odorata more strongly than species from its invasive range 期刊论文 OAI收割
SCIENTIFIC REPORTS, 2017, 卷号: 7, 期号: x, 页码: -
作者: Zheng, Yulong; Liao, Zhiyong

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Increased Competitive Ability Nurse Plants Soil Biota Facilitation Communities Evolution Invader Weapons Success Stress

Adsorption and desorption characteristics of diphenylarsenicals in two contrasting soils 期刊论文 OAI收割
JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA, 2013, 卷号: 25, 期号: 6, 页码: 1172-1179
作者: Wang, Anan; Li, Shixin; Teng, Ying; Liu, Wuxin; Wu, Longhua

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diphenylarsinic acid adsorption and desorption chemical weapons residual soil contamination

Research on energy characteristics of aerospace relay mirror system (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2011, August 12, 2011 - August 14, 2011, Harbin, China
Liu C.; Zhong X.; Piao Y.; Jin G.

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Aerospace Relay Mirror System (ARMS) as a new concept weapon used in reflection of High Energy Laser (HEL) in space is studied. It extends the attacking range of Ground Based Laser (GBL) weapons enormously. Relevant researches have been carried out for many years. The structures and operating theory of the entire system consists of ground-based high energy laser weapon and space-based relay mirror. The main work of this study is focused on the analysis of relay mirror energy characteristics to deduce the relationship among the attacking range of weapon and diameter of ARMS and target irradiance. Calculation examples are also given. The results proved the strong points and feasibility of ARMS theoretically further. It is summarized that more importance should be attached to ARMS development. The results given in this paper can be reference of an actual ARMS system to some extends. 2011 IEEE.

Laser pulse coded signal frequency measuring device based on DSP and CPLD (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging, May 24, 2011 - May 26, 2011, Beijing, China
作者: Zhang H.-B.; Wang T.-F.

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Laser pulse code is an anti-jamming measures used in semi-active laser guided weapons. On account of the laser-guided signals adopting pulse coding mode and the weak signal processing it need complex calculations in the frequency measurement process according to the laser pulse code signal time correlation to meet the request in optoelectronic countermeasures in semi-active laser guided weapons. To ensure accurately completing frequency measurement in a short time it needed to carry out self-related process with the pulse arrival time series composed of pulse arrival time calculate the signal repetition period and then identify the letter type to achieve signal decoding from determining the time value number and rank number in a signal cycle by Using CPLD and DSP for signal processing chip designing a laser-guided signal frequency measurement in the pulse frequency measurement device improving the signal processing capability through the appropriate software algorithms. In this article we introduced the principle of frequency measurement of the device described the hardware components of the device the system works and software analyzed the impact of some system factors on the accuracy of the measurement. The experimental results indicated that this system improve the accuracy of the measurement under the premise of volume real-time anti-interference low power of the laser pulse frequency measuring device. The practicality of the design reliability has been demonstrated from the experimental point of view.

Volatile chemicals from leaf litter are associated with invasiveness of a Neotropical weed in Asia 期刊论文 OAI收割
Ecology, 2011, 卷号: 92, 期号: 2, 页码: 316-324
Inderjit; Heather Evans; Christoph Crocoll; Devika Bajpai; Rajwant Kaur; Yu-Long Feng; Carlos Silva; Jacinto Treviño Carreón; Alfonso Valiente-Banuet; Jonathan Gershenzon; Ragan M. Callaway

收藏 | 浏览/下载：15/0 | 提交时间：2012/04/22

Ageratina adenophora allelopathy Bambusa arundinacea Bidens biternata biogeography China India and Mexico field sites litter native species richness novel-weapons hypothesis plant invasion volatile organic chemicals

Analysis of laser jamming to satellite-based detector (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, June 17, 2009 - June 19, 2009, Beijing, China
作者: Guo L.-H.; Guo R.-H.; Wang S.-W.

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The reconnaissance satellite communication satellite and navigation satellite used in the military applications have played more and more important role in the advanced technique wars and already become the significant support and aid system for military actions. With the development of all kinds of satellites anti-satellite laser weapons emerge as the times require. The experiments and analyses of laser disturbing CCD (charge coupled detector) in near ground have been studied by many research groups but their results are not suitable to the case that using laser disturbs the satellite-based detector. Because the distance between the satellite-based detector and the ground is very large it is difficult to damage it directly. However the optical receive system of satellite detector has large optical gain so laser disturbing satellite detector is possible. In order to determine its feasibility the theoretical analyses and experimental study are carried out in the paper. Firstly the influence factors of laser disturbing satellite detector are analyzed in detail which including laser power density on the surface of the detector after long distance transmission and laser power density threshold for disturbing etc. These factors are not only induced by the satellite orbit but dependence on the following parameters: laser average power in the ground laser beam quality tracing and aiming precision and atmospheric transmission. A calculation model is developed by considering all factors which then the power density entering into the detector can be calculated. Secondly the laser disturbing experiment is performed by using LD (laser diode) with the wavelength 808 nm disturbing CCD 5 kilometer away which the disturbing threshold value is obtained as 3.5510-4mW/cm2 that coincides with other researcher's results. Finally using the theoretical model the energy density of laser on the photosensitive surface of MSTI-3 satellite detector is estimated as about 100mW/cm2 which is largely exceed the disturbing threshold and therefore verify the feasibility of using this kind of laser disturbing the satellite-based detector. According to the results. using the similar laser power density absolutely saturate the requirements to laser disturbing satellite-based detector. If considering the peak power of pulsed laser even decrease laser average power it is also possible to damage the detector. This result will provide the reliable evidences to evaluate the effect of laser disturbing satellite-based detector. 2009 SPIE.