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浏览/检索结果: 共10条，第1-10条 帮助

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Multi-scale modal analysis for axisymmetric and spherical symmetric structures with periodic configurations 期刊论文  OAI收割
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING, 2017, 卷号: 317, 页码: 1068-1101
作者:  Li, Z. H.;  Ma, Q.;  Cui, J. Z.
  |  收藏  |  浏览/下载：26/0  |  提交时间：2018/07/30
Second-order two-scale finite element algorithm for dynamic thermo-mechanical coupling problem in symmetric structure 期刊论文  OAI收割
JOURNAL OF COMPUTATIONAL PHYSICS, 2016, 卷号: 314, 页码: 712-748
作者:  Li, Zhi-Hui;  Ma, Qiang;  Cui, Junzhi
  |  收藏  |  浏览/下载：35/0  |  提交时间：2018/07/30
A novel miniature absolute metal rotary encoder based on Single-track Periodic Gray Code (EI CONFERENCE) 会议论文  OAI收割
2012 2nd International Conference on Instrumentation and Measurement, Computer, Communication and Control, IMCCC 2012, December 8, 2012 - December 10, 2012, Harbin, Heilongjiang, China
作者:  Sun Y.;  Yang S.-W.;  Sun Y.;  Wan Q.-H.
收藏  |  浏览/下载：28/0  |  提交时间：2013/03/25
In order to improve the resolution and enhance the impact resistance and vibration resistance of encoders  a novel absolute metal rotary encoder based on Single-track Periodic Gray Code is presented. The configuration and working principle of the encoder is introduced  and then the metal code disc which can realize full scale absolute encoding on one single track and its corresponding metal slit disc are proposed. Finally  the data acquisition and processing system based on FPGA of encoder is presented. The resolution of the encoder can reach 5.27through electronic subdivision and calibration between the precision code and the coarse code with its volume only 4840mm. The encoder has some advantages such as small volume  low cost  high resolution and strong impact resistance. 2012 IEEE.  
High power VCSEL device with periodic gain active region (EI CONFERENCE) 会议论文  OAI收割
Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China
作者:  Zhang Y.;  Liu Y.;  Liu Y.;  Liu Y.;  Qin L.
收藏  |  浏览/下载：31/0  |  提交时间：2013/03/25
High power vertical cavity surface emitting lasers with large aperture have been fabricated through improving passivation  lateral oxidation and heat dissipation techniques. Different from conventional three quantum well structure  a periodic gain active region with nine quantum wells was incorporated into the VCSEL structure  with which high efficiency and high power operation were expected. The nine quantum wells were divided into three groups with each of them located at the antinodes of the cavity to enhance the coupling between the optical field and the gain region. Large aperture and bottom-emitting configuration was used to improve the beam quality and the heat dissipation. A maximum output power of 1.4W was demonstrated at CW operation for a 400m-diameter device. The lasing wavelength shifted to 995.5nm with a FWHM of 2nm at a current of 4.8A due to the internal heating and the absence of active water cooling. A ring-shape farfield pattern was induced by the non-homogeneous lateral current distribution in large diameter device. The light intensity at the center of the ring increased with increasing current. A symmetric round light spot at the center and single transverse mode operation with a divergence angle of 16 were observed with current beyond 4.8A.  
A two-scale method for identifying mechanical parameters of composite materials with periodic configuration 期刊论文  OAI收割
ACTA MECHANICA SINICA, 2006, 卷号: 22, 期号: 6, 页码: 581-594
作者:  Cui, J. Z.;  Yu, X. G.
  |  收藏  |  浏览/下载：19/0  |  提交时间：2018/07/30
Effects of fabricated error on transmission performance of double screens cross loop slot FSS configuration (EI CONFERENCE) 会议论文  OAI收割
2006 7th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2006, October 26, 2006 - October 29, 2006, Guilin, China
作者:  He B.
收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25
This paper proposes that the inter-layer separation distance (ISD) and the unit cell aligning error (UAE) are used as main variables to study the transmission performance attenuation of the double layer FSS configuration. The numerical analysis model for ISD and UAE was established and also was used to simulate the cross loop slot cell FSS transmission performance by the finite element and periodic moment method program. The double layer cross loop aperture FSS configuration designed was used as the numerical model. As a result of the numerical analysis  it is shown that both ISD and UAE produce insertion transmission loss (ITL) and insertion phase distortion (IPD) directly. Furthermore  ISD results in much loss of the amplitude of the transmitted signal for the FSS than UAE. It is significant for the designer for the multiplayer FSS to assign the fabricated error of the FSS dielectric layers. The UAE introduces the insertion phase variation badly.  
Magnon energy gap and the magnetically structural symmetry in a three-layer ferrimagnetic superlattice 期刊论文  OAI收割
Physica Status Solidi B-Basic Solid State Physics, 2006, 卷号: 243, 期号: 8, 页码: 1983-1995
R. K. Qiu; Z. D. Zhang; L. Q. Guo; C. H. Ying; A. Liang
收藏  |  浏览/下载：20/0  |  提交时间：2012/04/14
The quantitative relationship between metal radii, cationic radii and electronic configurations of elements 期刊论文  OAI收割
SCIENCE IN CHINA SERIES B-CHEMISTRY, 1999, 卷号: 42, 期号: 4, 页码: 337-344
作者:  Ai, DS;  Zeng, RS;  Ye, DN
  |  收藏  |  浏览/下载：16/0  |  提交时间：2018/09/26
The quantitative relationship between metal radii, cationic radii and electronic configurations of elements 期刊论文  OAI收割
SCIENCE IN CHINA SERIES B-CHEMISTRY, 1999, 卷号: 42, 期号: 4, 页码: 337-344
作者:  Ai, DS;  Zeng, RS;  Ye, DN
  |  收藏  |  浏览/下载：16/0  |  提交时间：2018/09/26
The two-scale analysis method for bodies with small periodic configurations 期刊论文  OAI收割
STRUCTURAL ENGINEERING AND MECHANICS, 1999, 卷号: 7, 期号: 6, 页码: 601-614
作者:  Cui, JZ;  Shih, TM;  Wang, YL
  |  收藏  |  浏览/下载：25/0  |  提交时间：2018/07/30