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浏览/检索结果: 共18条，第1-10条 帮助

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A high-order numerical manifold method with continuous stress/strain field 期刊论文  OAI收割
APPLIED MATHEMATICAL MODELLING, 2020, 卷号: 78, 页码: 576-600
作者:  Yang, Yongtao;  Sun, Guanhua;  Zheng, Hong
  |  收藏  |  浏览/下载：27/0  |  提交时间：2021/05/25
Dynamical stochastic resonance for nonuniform illumination image enhancement 期刊论文  OAI收割
IET Image Processing, 2018, 卷号: 12, 期号: 12, 页码: 2147-2152
作者:  Zhang, Yongbin;  Liu, Hongjun;  Huang, Nan;  Wang, Zhaolu
  |  收藏  |  浏览/下载：53/0  |  提交时间：2018/12/18
High-intensity attosecond X-ray source generation by using low-intensity spatial inhomogeneous mid-infrared pulse combined with an ultraviolet pulse 期刊论文  OAI收割
INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 2017, 卷号: 31, 期号: 1
作者:  Feng, Liqiang;  Liu, Hang
  |  收藏  |  浏览/下载：69/0  |  提交时间：2019/06/20
Exploring Local and Overall Ordinal Information for Robust Feature Description 期刊论文  OAI收割
IEEE Transactions on Pattern Analysis and Machine Intelligence, 2016, 卷号: 38, 期号: 11, 页码: 2198-2211
作者:  Zhenhua Wang;  Bin Fan;  Gang Wang;  Fuchao Wu
  |  收藏  |  浏览/下载：40/0  |  提交时间：2018/01/03
Harmonic Extension and Enhancement Using a Two-Color Chirped Pulse and an Ultrashort Ultraviolet Pulse 期刊论文  OAI收割
spectroscopy letters, 2014, 卷号: 47, 期号: 10, 页码: 781-789
作者:  Feng, Liqiang;  Li, Wenliang;  Liu, Hang;  Yuan, Minghu;  Yuan, Shuping
收藏  |  浏览/下载：20/0  |  提交时间：2015/11/17
Third-order optical intensity correlation measurements of pseudo-thermal light 期刊论文  OAI收割
CHINESE PHYSICS B, 2014, 卷号: 23, 期号: 9
Chen, XH; Wu, W; Meng, SY; Li, MF
收藏  |  浏览/下载：22/0  |  提交时间：2015/04/14
Fabrication of high-efficiency ultraviolet blazed gratings by use of direct Ar2-CHF3 ion-beam etching through a rectangular photoresist mask (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies, May 24, 2011 - May 26, 2011, Beijing, China
Tan X.
收藏  |  浏览/下载：25/0  |  提交时间：2013/03/25
In ultraviolet spectroscopy  groove irregularity and surface roughness of nanometer magnitude can cause a significant loss of diffraction efficiency. Therefore  there is a constant need to improve the diffraction efficiency. A blazed grating can concentrate most of the light intensity into a desired diffraction order  it is important to control the groove shape precisely  so it is the optimum choice among gratings of different kinds of profile. As the operating wavelength of most UV spectral applications is less than 200 nm  especially the blaze angle and the apical angle. We have presented a direct shaping method to fabricate EUV blazed gratings by using an ion-beam mixture of Ar+ and CHF2 +to etch K9 glass with a rectangular photoresist mask. With this method  the required blaze angle is small  we have succeeded in fabricating well-shaped UV blazed gratings with a 1200 line/mm groove density and 8.54 blaze angles and 1200 line/mm groove density and 11.68 blaze angles  and the metrical efficiency is about 81% and 78%. The good performance of the gratings was verified by diffraction efficiency measurements. When one uses the etching model  the conditions on the ion-beam grazing incident angle and the CHF3partial pressure should be noted. Besides  since the etched groove shape depends on the aspect ratio of the photoresist mask ridge  if we wish to fabricate larger gratings with this method  we must improve the uniformity of the photoresist mask before ion-beam etching. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).  
A partially insulated interface crack between a graded orthotropic coating and a homogeneous orthotropic substrate under heat flux supply 期刊论文  OAI收割
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, 2010, 卷号: 47, 期号: 6, 页码: 768-778
作者:  Zhou, Yueting;  Li, Xing;  Yu, Dehao
  |  收藏  |  浏览/下载：13/0  |  提交时间：2018/07/30
Analysis of measuring errors for the visible light phase-shifting point diffraction interferometer (EI CONFERENCE) 会议论文  OAI收割
2010 OSA-IEEE-COS Advances in Optoelectronics and Micro/Nano-Optics, AOM 2010, December 3, 2010 - December 6, 2010, Guangzhou, China
作者:  Zhang Y.
收藏  |  浏览/下载：13/0  |  提交时间：2013/03/25
In order to improve the measuring accuracy of the visible light phase-shifting point diffraction interferometer (PS/PDI) for the extreme ultraviolet lithography (EUVL) aspheric mirrors  the main measuring errors will be discussed in this paper. At first  the elementary configuration and measuring principle of the visible light phase-shifting point diffraction interferometer are introduced briefly  then the different errors which are possible to affect the measuring result are summed up  the errors include PZT phase-shifting error  detector nonlinearity error  detector quantization error  wavelength instability error and intensity instability error of the laser source  vibration error  air refractivity instability error and so on. Through detailed analysis and simulation  the magnitude of these errors can be obtained. By analysing the reasons which cause these errors and the relationship between these errors and interferometer configuration parameters  some methods are put forward to avoid or restrain these errors accordingly.  
A study on atmospheric turbulence effects in full-optical free-space communication systems (EI CONFERENCE) 会议论文  OAI收割
2010 6th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2010, September 23, 2010 - September 25, 2010, Chengdu, China
作者:  Liu P.
收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25
Next generation free-space optical communication systems have used fiber-optic technology as the seamless connection between free-space and optical fiber. The full-optical free-space optical communication systems use optical fiber as the receiver to get faster communication speed. The atmospheric turbulence deeply influenced on the optical wave propagated in terrestrial application. As the active receiving area of the full-optical free-space optical communication systems is very small  it is important to research on the atmospheric turbulence effects on the full-optical free-space optical communication system. In this paper  we discuss about both the turbulence-induced intensity fluctuations and the angle-of-arrival effects in full-optical free-space optical communication systems which are used in a few kilometers communication. We gave the numerical results of the atmosphere turbulence effects on the free-space optical communication systems. In order to minimize the atmospheric turbulence influence on the full-optical free-space optical communications system  we also investigate the use of fine tracking system in the communication system. We have set up a full-optical free-space communication system in Tokyo and received useful data from the experiment. We compared the receiving power of the experiment  when the fine tracking system is On and Off. From the experiment results  we can see that the fine tracking system effectively mitigates the atmospheric turbulence and increases the receiving power of the communication system. 2010 IEEE.