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浏览/检索结果: 共13条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 单晶高温合金定向凝固雀斑形成倾向液相密度差判据 期刊论文  OAI收割 稀有金属, 2023, 卷号: 47, 期号: 8, 页码: 1113-1121 作者:  姜卫国;  韩东宇;  董琳;  李相伟;  李凯文   |  收藏  |  浏览/下载：24/0  |  提交时间：2024/01/07 single crystal superalloy  directional solidification  freckle formation tendency  density difference  单晶高温合金  定向凝固  雀斑形成倾向  密度差   GNSS time offset monitoring based on the single difference among systems 期刊论文  OAI收割 IET RADAR SONAR AND NAVIGATION, 2020, 卷号: 14, 期号: 2, 页码: 299-302 作者:  Tu, Rui;  Zhang, Pengfei;  Zhang, Rui;  Fan, Lihong;  Liu, Jinhai   |  收藏  |  浏览/下载：24/0  |  提交时间：2020/11/09 delays  satellite navigation  radio receivers  Global Positioning System  GNSS time  single difference  time offset monitoring  multiple Global Navigation Satellite Systems  compatibility  interoperability  conventional signal space approaches  single-point positioning  SPP  precise point positioning  single-difference point positioning  SDPP  receiver clock parameter  common model errors  estimated time  smooth estimation  time offset estimation  different stations  system biases   基于高阶差分的type-1广义Feistel-SP结构与Feistel-SPSP结构比较研究 期刊论文  OAI收割 通信学报, 2014, 卷号: 35, 期号: 7, 页码: 1-9 董乐; 杜蛟; 吴文玲   |  收藏  |  浏览/下载：46/0  |  提交时间：2014/12/16 type-1广义Feistel结构  单SP函数  双SP函数  高阶差分  伪随机性  type-1 Feistel structure  single SP-function  double SP-function  higher-order difference  pseudo-randomness   Thermal difference analysis and athermalization design of infrared optical system (EI CONFERENCE) 会议论文  OAI收割 Optical Design and Testing IV, October 18, 2010 - October 20, 2010, Beijing, China 作者:  Zhang X.;  Zhang X.;  Zhang X. 收藏  |  浏览/下载：32/0  |  提交时间：2013/03/25 When infrared optical system works in a large temperature range  the thermal effect of optical lens and optical tube will produce image plane shift and lead to imaging quality deterioration. In order to eliminate the thermal aberration  the athermalization design principles of infrared optical system were introduced  and some commonly used methods of thermal difference compensation were described. Proceeding from single lens  the thermal difference caused by temperature changing was analyzed  and the relationship between temperature and focus shift was obtained. Considering optical tube thermal expansion  a set of equations to estimate the thermal difference of lens group was given. Finally  an infrared optical imaging system that can work under the temperature range of -40C to 60C was design according to athermal technique  in which a new mechanical passive temperature compensation was proposed. Through simulation  the athermalization design could make imaging plane shift the smallest. The simulation results coincided with the theoretical formula  and the design had reference value in engineering. 2010 Copyright SPIE - The International Society for Optical Engineering.   Graph fitting test method for the interpolation error of Moire fringe (EI CONFERENCE) 会议论文  OAI收割 9th International Conference on Electronic Measurement and Instruments, ICEMI 2009, August 16, 2009 - August 19, 2009, Beijing, China 作者:  Sun Y.;  Sun Y. 收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25 In order to realize the fast test for the interpolation error  the graph fitting test method for the interpolation error of Moire fringe is put forward in this paper. Firstly  the triangular wave Moire fringe photoelectric signal of the encoder whose phase difference is 90 are sampled to get the Lissajous graph of the two signals. Secondly  the single wave represented by the founded subsection function is used to fit the practical Moire fringe Lissajous graph. Then  the fitting result is tested to verify whether it satisfies the accuracy requirement. Lastly  the founded subsection function instead of the practical wave function is used to calculate the interpolation error. Using the graph fitting method to sample the Moire fringe single of 15-bits photoelectric encoder to get the interpolation error curve  the tested maximum interpolation error is 70" and the minimum error is - 69". Comparing with the interpolation error which is received from traditional test method  the change trend of the interpolation error curve is similar  and peak-peak value is almost equality. The results of experiment indicate that: the equipment is convenient and the examination method is efficient and feasible. The measure speed is fast and the manifestation result is intuitionistic. The system can be used in the working field. The method can avoid the speed influence and realize the dynamic interpolation error measure  which is significant for the research of encoder's dynamic accuracy characteristics. 2009 IEEE.   The analysis and design of low velocity estimation based on observer (EI CONFERENCE) 会议论文  OAI收割 2009 IEEE International Conference on Automation and Logistics, ICAL 2009, August 5, 2009 - August 7, 2009, Shenyang, China 作者:  Wang D.;  Zhang S. 收藏  |  浏览/下载：34/0  |  提交时间：2013/03/25 Low velocity servo system needs precision velocity estimation. An observer for low velocity estimation was proposed in this paper. First  the source of low velocity estimation errors and the shortcomings of the single period difference were analyzed. The relationship between the estimation accuracy and estimator's frequency characteristics was concluded. Then  the structure of the observer was proposed. Frequency characteristics were used to design the compensator which can stabilize the observer. The stability of the observer was also discussed. At last  the observer's estimation accuracy was evaluated through a quantitative comparison. The results of simulation and experiment have shown that the quantized error in velocity estimation decreases dramatically when a velocity observer is used. Compared with some commonly-used estimators  the phase lag accompanying the observer is much less. 2009 IEEE.   Electromagnetic field enhancement in TERS configurations 期刊论文  OAI收割 JOURNAL OF RAMAN SPECTROSCOPY, 2009, 卷号: 40, 期号: 10, 页码: 1343 Yang, ZL; Aizpurua, J; Xu, HX 收藏  |  浏览/下载：40/0  |  提交时间：2013/09/17 DIFFERENCE TIME-DOMAIN  ELECTRON-ENERGY-LOSS  RAMAN-SPECTROSCOPY  SINGLE-MOLECULE  TRANSITION-METALS  SCATTERING  SERS  NANOPARTICLES  SIMULATION  DIELECTRICS   Central hole effect on Whispering-Gallery-Mode of triangular lattice photonic crystal microcavity (EI CONFERENCE) 会议论文  OAI收割 Optoelectronic Materials and Devices III, October 27, 2008 - October 30, 2008, Hangzhou, China 作者:  Zhang Y.;  Wang L.;  Wang L.;  Wang L.;  Wang Z. 收藏  |  浏览/下载：25/0  |  提交时间：2013/03/25 Whispering-Gallery-Mode (WGM) photonic crystal microcavity is a kind of photonic crystal application and can potentially be used for miniaturized photonic devices  such as thresholdless lasers. In this paper we study the WGM of photonic crystal microcavities focusing on the so called H2 cavities which are formed by removing seven air holes. The WGM in these large-size cavities has some advantages compared with single defect WGM in the view of real device applications. We further add a central air hole in the cavity region to analyze the effect on WGM in the microcavity by finite difference time domain (FDTD) and plane wave expansion (PWE). It is found that the tolerance of WGM is large enough for the fabrication of electrical injection structure. 2008 SPIE.   Zero-difference and single-difference precise orbit determination for LEO using GPS 期刊论文  OAI收割 CHINESE SCIENCE BULLETIN, 2007, 卷号: 52, 期号: 15, 页码: 2024-2030 作者:  Peng DongJu;  Wu Bin 收藏  |  浏览/下载：17/0  |  提交时间：2010/07/30 low earth orbiters (LEO)  precise orbit determination (POD)  single-difference (SD)  zero-difference (ZD)   Mirror nuclei N-12 and B-12 in relativistic mean field theory 期刊论文  OAI收割 HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION, 2006, 卷号: 30, 页码: 53-55 作者:  Mei, Hua;  Chen, Hong;  Yao, Jiang-Ming;  Meng, Jie   |  收藏  |  浏览/下载：17/0  |  提交时间：2018/05/31 relativistic mean field theory  mirror nuclei  binding energy difference  single particle energy