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Calculation Methods of Axial Load-Bearing Capacity of Special-Shaped Column Composed of Concrete-Filled Steel Tubes 期刊论文
Journal of Tianjin University Science and Technology, 2019, 卷号: Vol.52, 页码: 67-74
作者:  Zhou, T.;  Di, C.;  Hu, J.
收藏  |  浏览/下载：13/0  |  提交时间：2019/11/21
Analysis of Low-Voltage Ride-Through Capability of Brushless Doubly-Fed Induction Generator 期刊论文
Control Engineering of China, 2016, 卷号: Vol.23 No.6, 页码: 852-857
作者:  Wu Xinkai;  Lei Yayun;  Xie Cong;  Gong Yaxiong
收藏  |  浏览/下载：10/0  |  提交时间：2019/12/31
The application of adaptive enhancement algorithm based on gray entropy in mammary gland CR image (EI CONFERENCE) 会议论文
2012 2nd International Conference on Consumer Electronics, Communications and Networks, CECNet 2012, April 21, 2012 - April 23, 2012, Three Gorges, China
Zhang M.-H.; Zhang Y.-Y.
收藏  |  浏览/下载：25/0  |  提交时间：2013/03/25
Mammary gland is composed entirely of soft tissue with approximate density  therefore mammary gland CR medicine radiation image presents a low contrast  and slight difference changes may be a manifestation of tumor  so it is necessary to enhance mammary gland CR image to improve its visual quality in order to meet the demands of doctor's clinical diagnosis. However the general enhancement algorithms over enhance the contrast and noise  due to image details lost  aiming at the defects  a mammary gland CR medicine image adaptive enhancement arithmetic based on image gray entropy is put forward. The arithmetic adapts dizzy image to magnify selected spatial frequency response in order to enhance the edge details of mammary gland CR images. It can adjust weighted factor K according to image gray characteristics namely pixel gray entropy. Experiments results demonstrate that mammary gland CR image enhanced by the algorithm has abundant details and high signal-to-noise ratio  moreover  CR image enhanced has good visual effect. So the method is effective and fit for enhancing CR medical radiation image edge details. 2012 IEEE.  
Precision analysis of simulation systems with hardware-in-loop caused by performance of three-Axis virtual flight motion simulator (EI CONFERENCE) 会议论文
2011 International Conference on Manufacturing Science and Technology, ICMST 2011, September 16, 2011 - September 18, 2011, Singapore, Singapore
Wang T.; Zhu M.-C.; Yin S.-L.; Jia H.-G.
收藏  |  浏览/下载：33/0  |  提交时间：2013/03/25
Simulation systems with hardware-in-loop are composed by three-Axis virtual flight motion simulator  simulation computer  load torque simulator  and visual simulation systems. Three-Axis Virtual Flight Motion Simulator are used to simulate the attitude of missile in simulation system with hardware-in-loop  so its performance influenced the result of simulation directly. This paper mainly analyzed the factors which influenced the performance of a three-Axis virtual flight motion simulator which we are used now in the lab  then analyzed the entire simulation system's error caused by these factors through numerical simulation method. By analysis we can see that bandwidth is the main factor influenced the precision of simulation systems with hardware-in-loop  mechanical device installation error and measurement error may also cause some errors of the systems at the same time.  
A composite hardness stamp in 184 PDMS for nanostructures transfer in high fidelity (EI CONFERENCE) 会议论文
2012 12th IEEE International Conference on Nanotechnology, NANO 2012, August 20, 2012 - August 23, 2012, Birmingham, United kingdom
Li S.; Shi L.; Yang Z.; Huang X.; Zhang Z.; Gao F.; Guo Y.; Yu W.; Du J.
收藏  |  浏览/下载：13/0  |  提交时间：2013/03/25
To improve the fidelity of nanostructures in transfer process  a composite stamp with reasonable hardness distribution in 184 PDMS used to nanoimprint was studied. The stamp is composed of a stiff 184 PDMS structured layer and a soft 184 PDMS supporter layer. We studied the relationship between the hardness of the 184 PDMS and the proportion of each component in 184 PDMS. The appropriate components proportions of prepolymer and curing agent corresponding to the different region of the composite stamp were presented. The fabrication method of the stamp is also presented. Corresponding experiments were carried out by using this stamp. Kinds of nanostructures were transferred in one inch diameter area with good fidelity. The feature sizes of the structures were less than 100 nm. 2012 IEEE.  
Stability control of quad-rotor based on explicit model following with inverse model feedforward method (EI CONFERENCE) 会议论文
2011 IEEE International Conference on Mechatronics and Automation, ICMA 2011, August 7, 2011 - August 10, 2011, Beijing, China
Bai Y.; Gong X.; Hou Z.; Tian Y.
收藏  |  浏览/下载：13/0  |  提交时间：2013/03/25
The quad-rotor is expected to carry out many different tasks. It is hoped that the quad-rotor can have different characteristics according to the different mission requirements. For this reason  a flight stability augmentation control system based on explicit model following with inverse model feedforward control method is proposed in this paper. This control system is composed of an explicit model  an inverse model and a feedback controller module. In order to calculate an inverse model of the coupled multivariable aircraft system  a feedback linearization loop is also applied to this control system. At last  simulations are performed to show the effectiveness of the designed stability augmentation control system in the presence of external disturbance and model uncertainty. The influence of explicit model to the characteristics of quad-rotor is also indicated in a contrast simulation result. 2011 IEEE.  
Research of active supporting technology based on 400mm thin mirror (EI CONFERENCE) 会议论文
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China
Li H.-Z.; Liu X.-Y.; Wang J.-L.
收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25
Using a spherical mirror of 400mm diameter and 12mm thickness  active supporting technology of thin mirror is researched. The axial support of the mirror is composed of 12 active supports and 3 fixed supports. The force actuator  which is composed of displacement actuator and force sensor  is installed in the active support. The mirror surface is tested by Zygo interferometer. For calibration  each actuator exerts unit force alone  and the surface variation is tested and taken as the response function of the actuator. The response functions of all actuators compose the stiffness matrix. Then the stiffness matrix is used by damped least square method to determine the correction force of each active support. In order to analyze the correction capability of the active supports  14 Zernike modes of the mirror surface are generated and tested respectively  and 7 modes are selected for correction. Initially  the RMS error of mirror surface is 1.16 I( =0.6328nm)when all actuators exert the same force. After 5 iterations  the RMS error of mirror surface is reduced to 0.13  close to the original surface quality. 2010 Copyright SPIE - The International Society for Optical Engineering.  
New phase measurement method for laser rangefinder (EI CONFERENCE) 会议论文
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
Sun W.-J.; Sun J.-N.; Bu W.-B.; Meng Z.
收藏  |  浏览/下载：20/0  |  提交时间：2013/03/25
A new phase measurement method is designed and presented by using the technique of signal shifting phase and the technique of signal multiplication for laser rangefinder. The intensity of laser light is modulated by cosine circuit signal  at the same time the cosine circuit signal is thansformed sine signal by the shifting phase technique. Two signals mentioned above are multiplied by received signal from the target respectively  then being transmitted into signal processor after passing through low band filter respectively. The result of phase-shift between the received signal and sent signal is calculated by means of signal processor and time-counter with double frequency of modulation signal. The proposed system is composed of four units such as control and count unit  emitting and receiving unit of laser light  signal processing unit and result display unit. The two most advantages of proposed system over others are its ability of proper isolation which reduces crosstalk and its independency thermal drift. Theoretical calculations and experimental results have shown the accuracy better than 2 mm. 2010 Copyright SPIE - The International Society for Optical Engineering.  
Static micro-michelson interferometer based on electro-optical effect (EI CONFERENCE) 会议论文
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems, November 19, 2008 - November 21, 2008, Chengdu, China
He X.; Jin G.; Liang J.
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25
Novel algorithm for computer-aided alignment of wide field of view complex optical system (EI CONFERENCE) 会议论文
Yang X.; Han C.
收藏  |  浏览/下载：29/0  |  提交时间：2013/03/25

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