机构

• 长春光学精密机械与物... [5]
• 金属研究所 [2]
• 物理研究所 [1]
• 中国科学院大学 [1]
• 西安光学精密机械研究... [1]

采集方式

• OAI收割 [9]
• iSwitch采集 [1]

内容类型

• 会议论文 [5]
• 期刊论文 [5]

发表日期

• 2016 [1]
• 2011 [2]
• 2010 [1]
• 2009 [2]
• 2006 [2]
• 2005 [1]
• 更多

学科主题

• aircraft i... [1]
• amplifiers [1]
• chemical r... [1]
• chemistry [1]
• gas dynami... [1]
• rare earth... [1]
• 更多

筛选

浏览/检索结果: 共10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 Yb-doped large-mode-area aluminosilicate laser fibre fabricated by chelate precursor doping technique 期刊论文  OAI收割 electronics letters, 2016, 卷号: 52, 期号: 23, 页码: 1942-u42 作者:  Peng, Kun;  Wang, Zhen;  Zhan, Huan;  Ni, Li;  Gao, Cong 收藏  |  浏览/下载：118/0  |  提交时间：2016/11/22 ytterbium  aluminium compounds  doping  optical fibre fabrication  optical fibre testing  electron probe analysis  secondary ion mass spectroscopy  laser beams  optical fibre amplifiers  AlSiO:Yb  power 1 kW  efficiency 81  0 percent  slope efficiency  laser output  two-stage master oscillator power amplifier system  time-of-flight secondary ion mass spectrometry  electron probe microanalysis  fibre testing  numerical aperture  homogeneous large-core preform  gas flow control system  high-purity materials  chelate precursor doping technique  large mode area aluminosilicate laser fibre   Design of motion compensation mechanism of satellite remote sensing camera (EI CONFERENCE) 会议论文  OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China Gu S.; Yan Y.; Xu K.; Jin G. 收藏  |  浏览/下载：47/0  |  提交时间：2013/03/25 With the development of aerospace remote sensing technology  the ground resolution of remote sensing camera enhances continuously. Since there is relative motion between camera and ground target when taking pictures  the target image recorded in recording media is moved and blurred. In order to enhance the imaging quality and resolution of the camera  the image motion had to be compensated. In order to abate the effect of image motion to image quality of space camera and improve the resolution of the camera  the compensation method of image motion to space camera is researched. First  the reason of producing drift angle and adjustment principle are analyzed in this paper. This paper introduce the composition and transmission principle of image motion compensation mechanism. Second  the system adopts 80C31 as controller of drift angle  and adopts stepping motor for actuators  and adopts absolute photoelectric encoder as the drift Angle measuring element. Then the control mathematical model of the image motion compensation mechanism are deduced  and it achieve the closed-loop control of the drift angle position. At the last  this paper analyses the transmission precision of the mechanism. Through the experiment  we measured the actual precision of the image motion compensation mechanism  and compared with the theoretical analysis. There are two major contributions in this paper. First  the traditional image motion compensation mechanism is big volume and quality heavy. This has not fit for the development trend of space camera miniaturization and lightweight. But if reduce the volume and quality of mechanism  it will bring adverse effects for the precision and stiffness of mechanism. For this problem  This paper designed a image motion compensation that have some advantages such as small size  light weight at the same time  high precision  stiffness and so on. This image motion compensation can be applicable to the small optics cameras with high resolution. Second  the traditional mechanism control need to corrected  fitting and iterative for the control formula of mechanism. Only in this way  we can get the optimal control mathematical model. This paper has high precision of the control formula derived. It can achieve the high precision control without fitting  It also simplify the difficulty of control mathematical model establishment. This paper designed the range of adjusting of image motion compensation mechanism between -5 +5. Based on choosing-5  -4  -3  -2  -1  0  +1  +2  +3  +4  +4 as the expectation value of the imaginary drift angle  we get ten groups of the fact data in adjusting drift angle measured. The test results show that the precision of the drift angle control system can be achieved in 1. It can meet the system requirements that the precision of the control system is less than 3'  and it can achieve the high-precision image motion compensation. 2011 SPIE.   Spin-glass behavior and exchange bias in phase-separated Nd(0.85)Sr(0.15)CoO(3) 期刊论文  OAI收割 Journal of Alloys and Compounds, 2011, 卷号: 509, 期号: 15, 页码: 4950-4953 J. H. Mao; Y. Sui; X. J. Wang; Y. Y. Yang; X. Q. Zhang; Y. Wang; W. F. Liu 收藏  |  浏览/下载：29/0  |  提交时间：2012/04/13 Spin glasses  Cobaltite  Exchange and superexchange  Exchange bias  la1-xsrxcoo3 0-less-than-or-equal-to-x-less-than-or-equal-to-0.5  transport-properties  magnetic-properties  system  dynamics   Slip motor speed control system based on LPC2136 and low cost CMOS camera (EI CONFERENCE) 会议论文  OAI收割 2010 IEEE International Conference on Advanced Computer Control, ICACC 2010, March 27, 2010 - March 29, 2010, 445 Hoes Lane - P.O.Box 1331, Piscataway, NJ 08855-1331, United States 作者:  Yang S.-W. 收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25 In this paper  Slip motor speed is in the precision of 1 percent in scope of 0 to 1400rpm. Practical application shows that the system is reliable  designed the slip motor speed control system for packing rubber strip which is used in plastic steel door and window. The system  stable and higher precision of control. The system design provides reference for similar control system and builds the basis for the design of intelligent control system. 2010 IEEE.  32-bit embedded microprocessor LPC2136 as the control core  PWM speed control  velocity feedback from tachogenerator  rubber strip position feedback from the CMOS camera  has proved that CMOS camera's image quality meets the engineering requirement   Level 0 and level 1 data processing for a type of hyper-spectral imager (EI CONFERENCE) 会议论文  OAI收割 2009 International Conference on Optical Instruments and Technology, OIT 2009, October 19, 2009 - October 21, 2009, Shanghai, China Li X.; Yan C. 收藏  |  浏览/下载：74/0  |  提交时间：2013/03/25 Hyper-spectral imaging (HSI) is a kind of optical remote sensor that can simultaneously obtain spatial and spectral information of ground targets. We are now designing a data processing system for a type of space-borne push-broom HSI  then it performs radiometric and spectral calibration based on the ground calibration results and onboard calibration collection. The detailed algorithms for bad pixel replacement  which has 128 spectral channels covering the spectral range from 400nm to 2500nm. With its large amount of spectral channels  radiometric and spectral calibration were presented. After processing  the HSI collects large volume of spectral imaging data need to be efficiently and accurately processed and calibrated. In this paper  the digital numbers downlinked from the spacecraft can be converted into at-sensor absolute spectral radiance of ground targets  the detailed Level 0 and Level 1 data processing steps for the HSI were presented. The Level 0 processing refers to a set of tasks performed on the data downlinked from the spacecraft  thus providing accurate quantified spectral imaging data for various applications. 2009 SPIE.  including decoding to extract science data  separating the science data into files corresponding to different tasks (e.g. ground imaging  dark imaging  and onboard calibration)  checking data integrity and instrument settings  data format conversion  and Level 0 files creation. The Level 1 processing performs several steps on Level 0 data. Firstly  it corrects the image artifacts (mostly the SWIR smear effect)  subtracts the dark background  and performs the bad pixel replacement according to the prelaunch measurement   Athermal design of hybrid refractive/harmonic diffractive optical system for far-infrared multi-band (EI CONFERENCE) 会议论文  OAI收割 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, November 19, 2008 - November 21, 2008, Chengdu, China 作者:  Liu Y.;  Liu Y.;  Zhang H.;  Zhang H.;  Sun Q. 收藏  |  浏览/下载：31/0  |  提交时间：2013/03/25 In order to get enough information about the target  avoid big chromatic aberration as a result of wide spectrum and the complexity of optical system and adapt different special environment temperature  a hybrid refractive/harmonic diffractive optical system in far-infrared multi-band is described in the paper. This diffractive optical system has been designed an athermalized multi-band imaging system with harmonic diffractive element in 15-50m spectrum  based on larger 1dispersion capability and particular thermal dispersive power of harmonic diffractive element. Then  at the temperature range from 0C to 40C  this design can simultaneously meet with all requirements of the imaging system in five harmonic wave bands  including15.8-16.2m  18.5-20m  23-25m  30.5-33.5m and 46-50m. In each harmonic wave band  the magnification changes as a function of wavelength  which creates image registration error. To compensate this shortcoming  a zoom optical system is designed with three lenses by means of optical two- component method. The design results show that the hybrid refractive/harmonic diffractive optical system can realize athermalized and achromatic design  and the zoom optical system makes half image height at 3.53mm in every harmonic wave band and still realizes aberration compensation action. In the five harmonic wave bands  each optical transfer function approaches the diffraction limit at ambient temperature range of 0C to 40C. Finally  the system realizes the requirements of portability  mini-type and ease for fabrication. 2009 SPIE.   A novel computational method to predict transcription factor dna binding preference 期刊论文  iSwitch采集 Biochemical and biophysical research communications, 2006, 卷号: 348, 期号: 3, 页码: 1034-1037 作者:  Qian, Ziliang;  Cai, Yu-Dong;  Li, Yixue 收藏  |  浏览/下载：23/0  |  提交时间：2019/05/10 Transcription factor  Transcription factor dna binding preference  Nearest neighbor algorithm  0/1 system  Jackknife cross-validation test  Gene ontology   Energy transfer in Pr3+- and Cr3+-codoped SrAl 12O19 system (EI CONFERENCE) 会议论文  OAI收割 作者:  Luo Y.;  Zhang X.;  Zhang X.;  Zhang X.;  Zhang J. 收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25 The energy transfer processes in Pr3+- and Cr 3+-codoped SrAl12O19 system are studied experimentally. The transfer can convert the 1S0 ultraviolet fluorescence of Pr3+ into the red emission of Cr 3+. The 3P0 state  which may be populated by 1S0&rarr1I6 emission  can also act as a donor state in the transfer to Cr3+. Cross-relaxation process is reported firstly in energy transfer between the pair of Pr 3+-Cr3+ in SrAl12O19 system. Two-step energy transfer is discussed  which involves two visible photons for each vacuum ultraviolet photon absorbed. 2006 Elsevier B.V. All rights reserved.   Crystal structure of the primitive orthorhombic epsilon '-(Al,Si)(4)Cr phase 期刊论文  OAI收割 JOURNAL OF ALLOYS AND COMPOUNDS, 2005, 卷号: 395, 期号: 1-2, 页码: 117 He, ZB; Kuo, KH 收藏  |  浏览/下载：15/0  |  提交时间：2013/09/17 AL-CR SYSTEM  QUASI-CRYSTALS  APPROXIMANT  0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1  EQUILIBRIA  SYMMETRY  AL-4(CR  ALLOYS  FAMILY   New phenomena in temperature dependence of spontaneous magnetization in a two-sublattice system 期刊论文  OAI收割 Journal of Magnetism and Magnetic Materials, 1997, 卷号: 174, 期号: 3, 页码: 261-268 Z. D. Zhang; M. H. Yu; T. Zhao 收藏  |  浏览/下载：12/0  |  提交时间：2012/04/14 two-sublattice system  temperature dependence of magnetization  ferromagnetism and ferrimagnetism  neutron-diffraction  rare-earth  lattice  model  crystal  0-less-than-or-equal-to-x-less-than-or-equal-to-1  anisotropy  mossbauer