中国科学院机构知识库网格系统: 检索

Theoretical study of fusion reactions S-32+Zr-94,Zr-96 and Ca-40+Zr-94,Zr-96 and quadrupole deformation of Zr-94 期刊论文 OAI收割
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2016, 卷号: 59, 页码: 8
作者: Wang, Bing; Zhao, WeiJuan; Zhao, EnGuang; Zhou, ShanGui

|

收藏 | 浏览/下载：23/0 | 提交时间：2018/05/31

empirical coupled channel model barrier distribution universal fusion function neutron transfer

Theoretical study of fusion reactions S-32+Zr-94,Zr-96 and Ca-40+Zr-94,Zr-96 and quadrupole deformation of Zr-94 期刊论文 OAI收割
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2016, 卷号: 59, 期号: 4, 页码: UNSP 642002
作者: Zhou, SG; Wang, B; Zhao, WJ; Zhao, EG; Zhou, SG (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.

|

收藏 | 浏览/下载：182/0 | 提交时间：2017/10/13

Empirical Coupled Channel Model Barrier Distribution Universal Fusion Function Neutron Transfer

Modeling and Analysis of Interstand Tension Control in 6-high Tandem Cold Rolling Mill 期刊论文 OAI收割
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL, 2014, 卷号: 21, 期号: 9, 页码: 830-836
作者: Zhang Xin; Chen Shuzong; Zhang Haoyu; Zhang Xiwen; Zhang Dianhua

|

收藏 | 浏览/下载：18/0 | 提交时间：2021/02/02

THICKNESS CONTROL DYNAMIC-MODEL SYSTEMS STRIP tension control tandem cold rolling mill bilinear transformation transfer function matrix model

Modeling and Analysis of Interstand Tension Control in 6-high Tandem Cold Rolling Mill 期刊论文 OAI收割
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL, 2014, 卷号: 21, 期号: 9, 页码: 830-836
作者: Zhang Xin; Chen Shuzong; Zhang Haoyu; Zhang Xiwen

|

收藏 | 浏览/下载：16/0 | 提交时间：2021/02/02

THICKNESS CONTROL DYNAMIC-MODEL SYSTEMS STRIP tension control tandem cold rolling mill bilinear transformation transfer function matrix model

Space optical remote sensor of the CAE thermal control index calculation method (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Advanced Design and Manufacturing Engineering, ADME 2011, September 16, 2011 - September 18, 2011, Guangzhou, China
作者: Li L.

收藏 | 浏览/下载：32/0 | 提交时间：2013/03/25

The thermal control indicators CAE methods of Space optical remote sensor are analyzed in the presented work. We sat up a thermal optical analysis model for space optical remote sensor. By assuming fully covered by in-orbit temperature load and using the finite element method for thermal deformation analysis we obtained the optical remote sensor surface deformation and displacement under various thermal loading. Using ZERNIKE polynomial wave was fitted to obtain ZERNIKE polynomial coefficients which were incorporated into the optical system design. Using CODE V optical calculation software heat-ray machines under elastic deformation of the system point spread function transfer function (MTF) wave front differential (WFE) etc. were calculated. Image quality changes of remote sensors are discussed in variety assumed cases such as temperature loads of quality change. By repeated iteration critical value of temperature fields meeting the design requirements are obtained for the optical system. Optical indicators were converged to the temperature field indicator then reasonable indicators of thermal control for remote sensors were obtained. For the thermal control design this method provided a reliable basis for design. (2011) Trans Tech Publications Switzerland.

Analyse the angular velocity estimation errors of -- filter based on high sampling rate (EI CONFERENCE) 会议论文 OAI收割
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011, July 15, 2011 - July 17, 2011, Inner Mongolia, China
作者: Zhang Y.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

In order to get angular velocity of stabilization servo mechanism from angular position sensors -- filter based on high sampling rate was established model and error characteristics were analyzed. With the hypothesis of constant acceleration -- filter and its angular velocity transfer function were deduced. Combing with optimum parameters the effects of and sample rate on the error characteristics were evaluated. According to the requirements of stabilization servo mechanism the frequency characteristics of angular velocity transfer function are analyzed and the filter parameters are designed. The experimental which filter tracked and smoothed sinusoidal signal the results show that when the cutoff frequency of angular velocity loop is 44.9rad/s sampling period and parameters are 0.08ms and 0.01279 respectively the phase leading of angular position is 70. -- filter tracked sinusoidal signals with maximum angular velocity(30/s) and maximum angular acceleration(30/s2) the error of angular velocity estimation was 0.053/s. In the engineering of electro-optical stabilization servo mechanism -- filter can reduce noise effectively and reached the requirement of platform angular velocity estimation. Also it is one of the effective methods to get angular velocity from angular position sensors. 2011 IEEE.

Modulation transfer function in seeker camera limits resulting from missile flutter caused by aerodynamic force (EI CONFERENCE) 会议论文 OAI收割
2010 2nd International Conference on Industrial Mechatronics and Automation, ICIMA 2010, May 30, 2010 - May 31, 2010, Wuhan, China
作者: Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

The imaging quality of seeker in flight mode has been evaluated through analyzing the effects of missile flutter on optical modulation transfer function (MTF) of the optical system. Firstly the data of transverse vibration has been processed to eliminate the trend term caused by the trajectory then obtained the displacement with two times trapezoidal integration. For the side rotation the high frequency noise interference in the data has been filtered by using five-point moving average method. Took this model as the quivering rule between the object and the image and then analyzed the effects of the transverse vibration and the side rotation on imaging quality through MTF. By calculation the r.m.s value of the image motion caused by missile transverse vibration is 0.026mm and the side rotation angle is 0.0044 . Through the establishment of two modulation transfer functions (MTF) of image random vibration and linear vibration the results show that the image quality had declined and the effect of transverse vibration on image quality is obvious. Through improving the rigidity of the missile and selection of small focal length optical system and shorten the time of exposure can improve the imaging quality of the seeker. 2010 IEEE.

Modulation transfer function measurement of sampled imaging systems in field test (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者: Yang L.; Zhang J.; Zhang J.; Zhang J.; Wang J.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

A digital mirror device (DMD) based light projector was developed as the target generator in modulation transfer function (MTF) measurement. In order to overcome the sampling-scene phase effect in MTF measurement of sampled imaging systems a method using random targets is introduced to yield a phase-averaged MTF. The main potential problem of implementing this method is the fact that the stationary assumption of the random targets may be vitiated in practical measurement especially in field test due to the ill condition. We provide an efficient model-independent way of analyzing and isolating the spectral contents arising from these additional contributions to MTF measurement. Algorithms with adaptive parameter selection were also developed for spectral estimation of the test image in order to overcome the challenge brought by the size limit of the test matrices for one certain field of view derived from the isoplantic region. The MTF measurement of a CCD video imager is used to demonstrate the measurement technique and illustrate the benefits over other methods. In order to validate the results comparisons have been made between MTF measurements of imager implemented using this method and bar target direct measurements. 2010 Copyright SPIE - The International Society for Optical Engineering.

The research on the automatic measurement of frequency characteristics of opto-electronic platform (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
作者: Liu H.; Liu H.; Chen J.; Liu H.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

A new frequency characteristic test method is proposed based on the digitization characteristics of optoelectronic platform servo system. First a digital processing controller is used to automatically test the entire process and tested data are uploaded to a PC through CAN-bus and then the tested data are transferred into accurate transfer function with the Levy method. Here we discuss the testing steps the data processing the extraction the Bode diagram plotting and the model identification in detail. The corresponding experiments are carried out and the results show that the method is simple with the features of high efficiency high precision and engineering feasibility. 2010 IEEE.

Non-parametric time series models for hydrological forecasting SCI/SSCI论文 OAI收割
2007
作者: Xia J.

收藏 | 浏览/下载：27/0 | 提交时间：2012/06/08

averaged method backfitting technique forecasting functional-coefficient autoregression model transfer function model local polynomial method non-parametric and functional-coefficient autoregression model periodic autoregressive model Semi-parametric regression model neural-networks runoff