中国科学院机构知识库网格系统: 检索

The crystal structure and transformations of the omicron phase ? in the Ti-Al-Nb system and on the ambiguity of its subvariants?1 and?2 期刊论文 OAI收割
SCRIPTA MATERIALIA, 2022, 卷号: 219, 页码: 6
作者: Xu, Shuai; Reid, Mark; Lin, Junpin; Liang, Yongfeng; Yang, Liang

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收藏 | 浏览/下载：21/0 | 提交时间：2023/05/09

In-situ neutron diffraction Phase transformation Crystal structure Structure prototype

The crystal structure and transformations of the omicron phase O in the Ti-Al-Nb system and on the ambiguity of its subvariants O1 and O2 期刊论文 OAI收割
SCRIPTA MATERIALIA, 2022, 卷号: 219, 页码: 6
作者: Xu, Shuai; Reid, Mark; Lin, Junpin; Liang, Yongfeng; Yang, Liang

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收藏 | 浏览/下载：52/0 | 提交时间：2022/09/16

Omicron Ti2NbAl phase In-situ neutron diffraction Phase transformation Crystal structure Structure prototype

Knowledge structure driven prototype learning and verification for fact checking 期刊论文 OAI收割
KNOWLEDGE-BASED SYSTEMS, KNOWLEDGE-BASED SYSTEMS, 2022, 2022, 卷号: 238, 238, 页码: 10, 10
作者: Wang, Shuai; Mao, Wenji; Wei, Penghui; Zeng, Daniel D.

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收藏 | 浏览/下载：34/0 | 提交时间：2022/06/10

Fact checking Fact checking Knowledge structure Hierarchical prototype learning Relation enhancement Verification Knowledge structure Hierarchical prototype learning Relation enhancement Verification

Research on Flexible Structure of a Space Flight Prototype Doppler Asymmetric Spatial Heterodyne Interferometer 会议论文 OAI收割
Beijing, PEOPLES R CHINA, 2020-11-30
作者: Dang, Jianan; Sun, Jian; Feng, Yutao; Chang, Chenguang; Wu, Yang

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收藏 | 浏览/下载：26/0 | 提交时间：2021/06/21

Doppler Asymmetric Spatial Heterodyne interferometer Space Flight Prototype Flexible support structure Modal analysis Random vibration Acceleration overload

Debris Flow Drainage Channel with Energy Dissipation Structures: Experimental Study and Engineering Application 期刊论文 OAI收割
JOURNAL OF HYDRAULIC ENGINEERING, 2018, 卷号: 144, 期号: 10, 页码: 6
作者: Chen, Jiangang; Chen, Xiaoqing; Zhao, Wanyu; You, Yong

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收藏 | 浏览/下载：49/0 | 提交时间：2018/09/03

Debris flow Drainage channel Energy dissipation structure Roughness coefficient Prototype observation

A numerical study on responses of submerged floating structures undergoing vortex-induced vibration and seismic excitation 会议论文 OAI收割
2nd International Symposium on Submerged Floating Tunnels and Underwater Tunnel Structures (SUFTUS), Chongqing, PEOPLES R CHINA, DEC, 2016
作者: Kang L(康凌); Ge F(葛斐); Wu XD(武晓东); Hong YS(洪友士)

收藏 | 浏览/下载：24/0 | 提交时间：2017/05/12

Fluid-structure interaction nonlinearity tether spacing TUNNEL PROTOTYPE CHINA

Design of a miniature axial flux flywheel motor with PCB winding for nanosatellites (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Optoelectronics and Microelectronics, ICOM 2012, August 23, 2012 - August 25, 2012, Changchun, China
Wu J.

收藏 | 浏览/下载：39/0 | 提交时间：2013/03/25

This paper presents the design and analysis of an axial flux permanent-magnet (AFPM) machine for nanosatellites application. It is a miniature axial flux surface mounted permanent magnet flywheel motor using a printed circuit board (PCB) stator winding. The PCB stator has simplified the design and construction and avoids unnecessary space since size reduction has become one of the most important aspects of flywheel motor design for nanosatellites. The performances of the machine are estimated by combination method of three-dimensional (3D) electromagnetic finite element analysis (FEA) and approximate theoretical analysis. The back EMF and electromagnetic torque are derived. A comparison between the analysis and experimental measurement results of the prototype machine is also presented. Both simulated and experimental results show that the proposed motor would be an acceptable solution for the nanosatellite applications with advantages such as simple structure and low-cost as multi-layer circuit board production techniques have made the production of printed circuit coils cheaper and easier. 2012 IEEE.

Study on spectrograph for ionosphere: A broadband imaging instrument prototype for far-ultraviolet (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
作者: Wang S.-R.; Lin G.-Y.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

Current research on space-based exploration for the ionosphere needs more advanced technologies. Because the spectral signals in the ionosphere distributing basically in the far-ultraviolet waveband are very weak. Usual spectrometer structures and detectors such as CCD can't receive enough information. Based on this principle of atmospheric sounding the imaging spectrometer prototype for ionosphere detection application was designed to solve the problem. This prototype consists of the telescope and the imaging spectrometer. The simple structure and small number of mirrors can help higher transmission efficiency be achieved and weak signals detection be implemented. The telescope is an off-axis parabolic mirror and the spectrometer is a modified Czerny-Turner spectral imaging system. Modified Czerny-Turner spectrometer contains a spherical mirror a fixed plane grating and a toroidal mirror. By adjusting the incident angle to the collimating mirror and using toroidal mirror coma and astigmatism were corrected well. We also optimize distances between the grating to the focusing mirror and the focusing mirror to the image plane to improve disadvantages of traditional Czerny-Turner structure. Designed results demonstrate that aberrations are substantially corrected and high image quality can be obtained in broad waveband. The photon counting Wedge-Strip-Anode detector with micro-channel planes as the receiving plane is accepted for the instrument prototype. The other photon counting 2-D detector responding well for weak light such as Cross-Delay line detector and MAMA detector can also be used for detection. The calibration and performances testing system is made of a vacuum system a deuterium lamp a monochrometer and the instrument prototype. Results obtained from the experiment show that the spectral resolution is 2.4 nm and the spatial resolution is 80 m. The other calibration experiments are running. The technology of the spectrometer prototype is important for the research and applications of ionosphere remote sensing. 2011 SPIE.

Optimal design of strap-down inertial navigation support under random loads (EI CONFERENCE) 会议论文 OAI收割
2010 IEEE International Conference on Information and Automation, ICIA 2010, June 20, 2010 - June 23, 2010, Harbin, Heilongjiang, China
作者: Li M.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

In order to realize miniaturization and light weight of the strap-down inertial navigation system and then to make sure that it works well under random loads optimal design is applied to the strap-down inertial navigation support with the methods of topology optimization and size optimization. Firstly based on the installation requirement of devices and connection requirement of the support and the carrier the initial structure of the support is designed. Topology optimization with FEA software ANSYS is adopted on the initial structure to get the basic one. Then 5 critical sizes are chosen as design variables and the support structure is optimized by means of size optimization to reach light weight with satisfying the requirement of dynamic stiffness. Finally random vibration analysis is applied to the initial structure. In the mean time random vibration test is carried out to qualify the analysis method. After the qualification a random vibration analysis is applied to the optimized support structure to get the rms of displacement response and acceleration response of the support to validate whether the optimized structure is appropriate. The results indicate that the dynamic stiffness of the optimized support structure satisfies the design requirements and its weight is lighter 49.38% than that of the initial one. This research can be a reference to the structure design of supports under random loads and the result has been applied to the development and manufacture of a prototype aerocraft. 2010 IEEE.

Study on the Driving Scheme of a 4-m Alt-azimuth Telescope (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Large Mirrors and Telescopes, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Zhang J.; Dai S.; Zhao Y.; Zhao Y.; Zhao Y.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

By summarizing the corresponding parameters Of the driving system of a 4-m Alt-azimuth telescope some unit techniques like the driving modes and structure angular position measurement methods in detail have been analyzed in the paper. A set of primary schemes for astronomical applications including the altitude axes being driven by 2 DC torque motors the azimuth by 4 DC torque motors using helical gears and two pieces of the 27-bit segment tape encoders for each set of axes is proposed. To meet practical engineering needs the shafting motion parameters are designed and motor elementary parameters are primarily calculated to offer the important references for further study on system driving model and prototype development.