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浏览/检索结果: 共10条，第1-10条 帮助

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Stability analysis of CAES salt caverns using a creep-fatigue model in Yunying salt district, China 期刊论文  OAI收割
JOURNAL OF ENERGY STORAGE, 2023, 卷号: 62, 期号: -, 页码: -
作者:  Zhao, Kai;  Ma, Hongling;  Li, Haoran;  Yang, Chunhe;  Li, Peng
  |  收藏  |  浏览/下载：23/0  |  提交时间：2023/08/02

Use of quantitative real-time PCR to select reference genes in the testis and ovary of Apostichopus japonicus during the breeding period

 期刊论文  OAI收割
AQUACULTURE REPORTS, 2022, 卷号: 22, 页码: 7
作者:  Zhang, Shuangyan;  Ru, Xiaoshang;  Su, Fang;  Liang, Wenke;  Zhang, Libin
  |  收藏  |  浏览/下载：40/0  |  提交时间：2022/07/18
Temporal stability of soil moisture on two transects in a desert area of northwestern China SCI/SSCI论文  OAI收割
2016
作者:  Zhang P. P.;  Shao, M. A.;  Zhang, X. C.;  Dai, XQ
收藏  |  浏览/下载：42/0  |  提交时间：2016/12/16
Timing generator of scientific grade CCD camera and its implementation based on FPGA technology (EI CONFERENCE) 会议论文  OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, April 26, 2010 - April 29, 2010, Dalian, China
作者:  Li Y.;  Li Y.;  Li Y.;  Li Y.
收藏  |  浏览/下载：32/0  |  提交时间：2013/03/25
The Timing Generator's functions of Scientific Grade CCD Camera is briefly presented: it generates various kinds of impulse sequence for the TDI-CCD  video processor and imaging data output  acting as the synchronous coordinator for time in the CCD imaging unit. The IL-E2TDI-CCD sensor produced by DALSA Co.Ltd. use in the Scientific Grade CCD Camera. Driving schedules of IL-E2 TDI-CCD sensor has been examined in detail  the timing generator has been designed for Scientific Grade CCD Camera. FPGA is chosen as the hardware design platform  schedule generator is described with VHDL. The designed generator has been successfully fulfilled function simulation with EDA software and fitted into XC2VP20-FF1152 (a kind of FPGA products made by XILINX). The experiments indicate that the new method improves the integrated level of the system. The Scientific Grade CCD camera system's high reliability  stability and low power supply are achieved. At the same time  the period of design and experiment is sharply shorted. 2010 Copyright SPIE - The International Society for Optical Engineering.  
In situ long trace profiler for measurement of Wolter type-I mirror (EI CONFERENCE) 会议论文  OAI收割
Advances in Metrology for X-Ray and EUV Optics III, August 1, 2010 - August 2, 2010, San Diego, CA, United states
作者:  Chen B.;  Chen B.
收藏  |  浏览/下载：27/0  |  提交时间：2013/03/25
The surface profile of Wolter type-I mirror has a great impact on the performance of Solar X-ray Telescope. According to the existing fabrication instrument and experimental conditions in our lab  an in situ Long Trace Profiler is developed and set up on the fabrication instrument in order to measure the surface profile of Wolter mirror in real time during fabrication process. Its working mechanism  structural parameters and data processing algorithm are investigated. The prototype calibrated by a standard plane mirror is used to measure a sample of Wolter type-I mirror. The results show that our prototype can achieve an accuracy of 2.6rad rms for slope error with a stability of 1.33rad during the whole measurement period. This can meet further fabrication requirements. 2010 Copyright SPIE - The International Society for Optical Engineering.  
网络控制系统控制器设计和稳定性分析 学位论文  OAI收割
工学博士, 中国科学院自动化研究所: 中国科学院研究生院, 2009
作者:  郭新兰
收藏  |  浏览/下载：60/0  |  提交时间：2015/09/02
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.  
Key techniques of laser direct writing of fine lines on the spherical surface (EI CONFERENCE) 会议论文  OAI收割
ICO20: Optical Design and Fabrication, August 21, 2005 - August 26, 2005, Changchun, China
Liang F.; Hu J.
收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25
The main principles of laser direct writing (LDW) system for lines on the spherical surface (SS) are discussed. It is pointed out that line profile is determined by the exposure dose distribution  which lies on the light intensity distribution of focus plane and the scanning speed. To improve the quality of line profile on the SS  several key techniques as follows are introduced. Firstly  the unique system configuration  four axes mutually intersecting at the center of the SS  is adopted  which ensures the shape of the focus be maintained circular during the writing period. Secondly  an automatic focus system (AFS) with the function of automatic focus in a certain range is introduced. Thirdly  to guarantee the linear velocity to accord with the exposure character of the photoresist all the time  an efficient arithmetic that controls motors run at appropriate angular velocity in different latitude is developed. Finally  to achieve a stable and well-behaved system so as to compensate the velocity instability resulting from unavoidable errors of mechanical and electronics factor  a powerful programmable multi-axis controller (PMAC) is utilized as the kernel element of the servocontrol system  and the curves of step response and parabolic response achieved by feedforward and PID loop tuning indicate that the location precision and velocity stability have reached a high level. The experimental results of LDW of lines on the SS work piece with a diameter 30 mm and a radius equal to 100 mm are given. The section analysis of the lines on the photoresist by the atomic force microscope (AFM) after exposure and development is performed. The results show that line width is about 3.0 m  and the steep sides of the lines are parallel to each other.  
Supersolubility and induction of aluminosilicate nucleation from clear solution 期刊论文  OAI收割
JOURNAL OF CRYSTAL GROWTH, 2003, 卷号: 254, 期号: 1-2, 页码: 156-163
作者:  Zhang, YF;  Li, YH;  Zhang, Y
收藏  |  浏览/下载：17/0  |  提交时间：2013/11/08
Controlling Hopf bifurcations: Discrete-time systems 期刊论文  OAI收割
DISCRETE DYNAMICS IN NATURE AND SOCIETY, 2000, 卷号: 5, 期号: 1, 页码: 29-33
作者:  Chen, GR;  Fang, JQ;  Hong, YG;  Qin, HS
  |  收藏  |  浏览/下载：16/0  |  提交时间：2018/07/30