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Design of a dual-band wearable planar inverted f antenna based on characteristic mode theory 会议论文
作者:  Yan, Sen;  Hu, Xiaomu;  Zhang, Jiahao;  Kong, Linghui;  Vandenbosch, Guy A.E.
收藏  |  浏览/下载：15/0  |  提交时间：2019/11/19
Layout Optimization of Solar Array for Stratospheric Airship with Thermal Effect 会议论文
Proceedings of 2018 9th International Conference on Mechanical and Aerospace Engineering, ICMAE 2018
作者:  Wu, Y.;  Lv, M.;  Cui, E.;  Zhu, M.
收藏  |  浏览/下载：3/0  |  提交时间：2019/12/30
The Application Research of BIM Technology in Energy Efficiency Evaluation About High-rise Building 会议论文
4th International Conference on Energy and Environmental Protection (ICEEP), Shenzhen, PEOPLES R CHINA, JUN 02-04, 2015
作者:  Tan Xianliang*;  Guan Changsheng;  Lu Yiwei;  Liu Aidong;  Xiang Chao
收藏  |  浏览/下载：2/0  |  提交时间：2019/12/24
The endothermic performance experimental study of new type cavity heat receiver 会议论文
Guangzhou, China, December 29, 2012 - December 30, 2012
作者:  Li, Jinping;  Zhao, Qintong;  Feng, Rong;  Li, Zhen;  Ma, Jian
收藏  |  浏览/下载：12/0  |  提交时间：2020/11/15
Study on nano film of TiO/sub 2/ and ZnFe/sub 2/O/sub 4 / composite prepared by dip coating method 会议论文
Key Engineering Materials, 3rd International Conference on High-Performance Ceramics (CICC-3), Shenzhen, China, INSPEC
Hongyi Li; Yunhan Ling; Xinjun Jiang; Xinde Bai
收藏  |  浏览/下载：3/0
Theoretical analysis of emission characteristics of second-order distributed feedback semiconductor lasers (EI CONFERENCE) 会议论文
Semiconductor Lasers and Applications IV, October 18, 2010 - October 19, 2010, Beijing, China
Qin L.; Ye S.; Hu Y.; Zhang N.; Ning Y.; Liu Y.; Wang L.
收藏  |  浏览/下载：14/0  |  提交时间：2013/03/25
Based on the modified coupled-wave theory  the emission characteristics  including threshold gain  photon density distribution in the cavity  and external differential quantum efficiency for second-order DFB lasers are investigated. Numerical simulation results show that for given device structure with wavelength of 1.55 m  the feedback coupling coefficient and the surface radiation coupling coefficient of the second-order grating have great influence on the emission characteristics of the device. By choosing different duty cycles of the grating  we can change the two coupling coefficients  which affect the emission characteristics. For an overall consideration  an optimal duty cycle of 0.43 is chosen. The optimized results show that the device works without degeneracy modes and spatial burning hole. Besides  the side-mode suppress ratio (SMSR) and external differential quantum efficiency reach as high as 42 dB and 47%  respectively. 2010 SPIE.  
Experiments of second harmonic generation output in pulsed TEA CO 2 laser (EI CONFERENCE) 会议论文
High-Power Lasers and Applications V, October 18, 2010 - October 19, 2010, Beijing, China
Guo R.; Li D.
收藏  |  浏览/下载：42/0  |  提交时间：2013/03/25
It is always the hot subject to realize the output of high-power laser in the range of 3-5m wavelength. This rang of wave band has greatly important applications in military because it located in the atmosphere window. Generally there are two ways to obtain this range of laser wavelength. One way is through optical parameter oscillation (OPO) from shorter laser wavelength and the other is through second harmonic generation (SHG) from longer laser wavelength. Firstly  the comparison between tow nonlinear crystals ZnGeP2 and AgGaSe2 is conducted for their nonlinear coefficient and damaging threshold in theory. The theoretical results show that the crystal AgGaSe 2 is more suitable for the SHG of pulsed TEA CO2 laser. When using pulsed TEA CO2 laser with wavelength of 9.3m to pumping AgGaSe2 SHG crystal  the wavelength of 4.65m is obtained. In the condition of repetition rate 100Hz  the upmost output power of single pulse is up to level of 1W  which corresponding efficiency of SHG is about 6%. The experimental results show that the polarization of laser beam has greatly influence on the SHG output of the crystal. Under the radiation of 3MW/cm 2 from fundamental wave and the right position for maximal SHG output in the crystal  when polarization of laser beam rotates 4.5  the SHG output of energy decrease about 30%. The research of this paper will make a foundation for further development of mid-infrared laser. 2010 Copyright SPIE - The International Society for Optical Engineering.  
Method for obtaining real temperature of space object by using the ratio of emissivity at different wavelengths (EI CONFERENCE) 会议论文
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China
Guo-Qiang W.; Tao C.; Jian-Li W.
收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25
The infrared radiation character (temperature and efficiency radiation area) of a space object is an important characteristic  we can judge the state of the object working in orbit by measuring temperature and variety. Due to lower temperature of the object and far distance between the object and the earth  the infrared radiation signal is faintness  therefore temperature and the infrared radiation character is difficult to measure. There are several methods to measure the temperature of the object in theory and each one has its applicability respectively  such as applying Wien Law to compute temperature  based on Stefan-Bolzmann law to compute temperature and utilizing multi-spectrum detector to measure temperature As a whole these methods are based on the hypothesis that the object is a Black-body or the radiance emissivity is constant. In fact  homochromatic radiance of object is not a constant but a function that changes with wavelength. Since the problem that an object whose homochromatic radiance s not a constant which results in temperature can not be computed accurately  we bring forward a method to contrast the luminance of the object at different wavelengths and deduce the relationship among homochromatic radiance and wavelength and the temperature of Black-body  from which we can compute real temperature of object. 2009 SPIE.  
Time-domain Characteristics of Terahertz Radiation for Dipole Antenna of Nonlinear Photoconductive Switches 会议论文
2009 LASERS & ELECTRO-OPTICS & THE PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, VOLS 1 AND 2, 2009-01-01
作者:  Xue, Hong;  Shi, Wei;  Ma, Xiangrong
收藏  |  浏览/下载：2/0  |  提交时间：2019/12/25
Design of optical elements for imaging the earth's plasmasphere (EI CONFERENCE) 会议论文
International Symposium on Photoelectronic Detection and Imaging, ISPDI 2007: Optoelectronic System Design, Manufacturing, and Testings, September 9, 2007 - September 12, 2007, Beijing, China
Wang L.-H.; Wang X.-K.; Chen B.
收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25
Studying the distribution of He+ in Earth's plasmasphere by detecting its resonantly-scattered emission at 304A will record the structure and dynamics of the cold plasma in Earth's plasmasphere on a global scale. EUV imaging systems usually utilizes near normal incidence optics including multilayer mirror and filter. In this paper  the space condition of the Earth's plasmasphere to confirm the expected performance of mirror and filter for this task were analyzed and some guidelines for the design of the optical elements were introduced. In order to achieve higher response at 304A and reduce 584A radiation for the optical system  a new multilayer coating of Mo/Si with UOx (x=2-3) was developed  and it is indicated that promising filter material is Al/C with a nickel mesh. In addition  we compute the reflectance of multilayer mirror based on optical constants and the transmission of the filter based on atomic scattering factor. The results show the multilayer mirror has high reflectance of 26.27% at 304 Aand low reflectance of 0.60% at 584A. Finally  the conversion efficiency of mirror coupled with filter is 6.88% at 304A and 0.01% at 584 A.  

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