中国科学院机构知识库网格系统: 检索

Cracking mechanisms in additively manufactured pure tungsten from printing single tracks, thin walls and cubes 期刊论文 OAI收割
MATERIALS & DESIGN, 2023, 卷号: 234, 页码: 17
作者: Chen, Jinhan; Li, Mingshen; Li, Kailun; Zhang, Wenjing; Yang, Zhengmao

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收藏 | 浏览/下载：29/0 | 提交时间：2023/11/28

Cracking Tungsten Additive manufacturing Grain boundaries Microstructures Geometric effect

SGOT: A Simplified Geometric-Optical Model for Crown Scene Components Modeling over Rugged Terrain 期刊论文 OAI收割
REMOTE SENSING, 2022, 卷号: 14, 期号: 8, 页码: 24
作者: Hu, Guyue; Li, Ainong

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收藏 | 浏览/下载：36/0 | 提交时间：2022/07/05

canopy reflectance geometric-optical model scene components topographic effect

Sequential Templating Approach: A Groundbreaking Strategy to Create Hollow Multishelled Structures 期刊论文 OAI收割
ADVANCED MATERIALS, 2019, 卷号: 31, 期号: 38, 页码: 19
作者: Mao, Dan; Wan, Jiawei; Wang, Jiangyan; Wang, Dan

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收藏 | 浏览/下载：82/0 | 提交时间：2019/11/12

application geometric effect hollow multishelled sequential templating approach

Broadband spin Hall effect of light in single nanoapertures 期刊论文 OAI收割
LIGHT-SCIENCE & APPLICATIONS, 2017, 卷号: 6
作者: Luo, Xian-Gang; Pu, Ming-Bo; Li, Xiong; Ma, Xiao-Liang

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收藏 | 浏览/下载：21/0 | 提交时间：2018/11/20

geometric phase metasurface nanoaperture spin Hall effect of light

Substituent effects on geometric and electronic properties of iron tetraphenylporphyrin: a DFT investigation 期刊论文 OAI收割
JOURNAL OF MOLECULAR MODELING, 2012, 卷号: 18, 期号: 6, 页码: 2483-2491
作者: Wei, Lu; She, Yuanbin; Yu, Yanmin; Yao, Xiaoqian; Zhang, Suojiang

收藏 | 浏览/下载：28/0 | 提交时间：2013/10/17

DFT Electronic properties Geometric properties Iron tetraphenylporphyrin Substituent effect

Optimum design of the carbon fiber thin-walled baffle for the space-based camera (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
Yan Y.; Gu S.; An Y.; Jin G.

收藏 | 浏览/下载：15/0 | 提交时间：2013/03/25

The thin-walled baffle design of the space-based camera is an important job in the lightweight space camera research task for its stringent quality requirement and harsh mechanical environment especially for the thin-walled baffle of the carbon fiber design. In the paper an especially thin-walled baffle of the carbon fiber design process was described and it is sound significant during the other thin-walled baffle design of the space camera. The designer obtained the design margin of the thin-walled baffle that structural stiffness and strength can tolerated belong to its development requirements through the appropriate use of the finite element analysis of the walled parameters influence sensitivity to its structural stiffness and strength. And the designer can determine the better optimization criterion of thin-walled baffle during the geometric parameter optimization process in such guiding principle. It sounds significant during the optimum design of the thin-walled baffle of the space camera. For structural stiffness and strength of the carbon fibers structure which can been designed the effect of the optimization will be more remarkable though the optional design of the parameters chose. Combination of manufacture process and design requirements the paper completed the thin-walled baffle structure scheme selection and optimized the specific carbon fiber fabrication technology though the FEM optimization and the processing cost and process cycle are retrenchment/saved effectively in the method. Meanwhile the weight of the thin-walled baffle reduced significantly in meet the design requirements under the premise of the structure. The engineering prediction had been adopted and the related result shows that the thin-walled baffle satisfied the space-based camera engineering practical needs very well its quality reduced about 20% the final assessment index of the thin-walled baffle were superior to the overall design requirements significantly. The design method is reasonable and efficient to the other thin-walled baffle that mass and work environment requirement is requirement harsh. 2011 SPIE.

Effect of gimbal point displacement on optical axis pointing precision in an image seeker (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
作者: Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：39/0 | 提交时间：2013/03/25

A concentric glass spherical dome was usually chosen as the transparent window mounted in front of the optical lens in an image seeker. However optical ray had to change its direction when propagating through the dome due to refraction unless passing through the center of the dome which demanded gimbal point coincide with the center of the dome exactly. In fact gimbal point displacement could not be eliminating due to fabrication assembly and vibration therefore the optical axis pointing error generated. In this paper the effect of gimbal point displacement on optical axis pointing precision in an image seeker was analyzed and the theoretical expression of the optical axis pointing error was derived based on geometric optics and the error dynamics was explored by numerical. Take a visible light image seeker as a case the thickness of concentric glass spherical dome was 8mm and the inner radius was 72mm and the optical axis pointing errors varying dynamically with the look angle and the gimbal point displacement were shown in graph. When the gimbal displacement was 0.11mm the maximum optical axis pointing error was 0.054mrad that is equal to the instantaneous field of view (IFOV) corresponding to the camera system whose focal length was 120mm and pixel size was 6.5m. Furthermore with the gimbal displacement increasing the optical axis pointing error increased linearly. The analyzed results provided a theoretical basis for the displacement range which had to be limited strictly in the gimbal design process. 2011 IEEE.

Speed Geometric Quantum Logical Gate Based on Double-Hamiltonian Evolution under Large-Detuning Cavity QED Model 期刊论文 OAI收割
COMMUNICATIONS IN THEORETICAL PHYSICS, 2010, 卷号: 54, 期号: 4, 页码: 672-674
作者: Chen Chang-Yong; Liu Zong-Liang; Kang Shuai; Li Shao-Hua

收藏 | 浏览/下载：21/0 | 提交时间：2015/06/25

unconventional geometric gate dissipation the heating effect

Modeling of satellite borne TDI CCD pitching imaging image motion velocity vector (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: Zhang L.; Li S.; Zhang L.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

In order to obtain three-dimensional observation effect with single satellite borne time delay and integrate charge coupled device (TDI-CCD) pitching imaging is required. More accurate real-time image motion velocity vector computational model of space camera is also necessary to make the imaging perfect. Imaging motion velocity vector computation model must be set up on image plane at pitching imaging. According to the geometric relationship between the pitching imaging space camera and the Earth's rotation motion satellite borne TDI CCD pitching imaging motion velocity vector model is derived by mapping the ground speed to the image plane and using coordinate transformation method. The numerical simulation results show that the image velocity model can reduce deviation angle error about 33' and about 30% image motion speed error compared to traditional ground velocity model. 2009 IEEE.

Active pixel sensor geometrical characteristic effects on star image subdivided locating accuracy for star tracker (EI CONFERENCE) 会议论文 OAI收割
ICO20: Remote Sensing and Infrared Devices and Systems, August 21, 2005 - August 26, 2005, Changchun, China
作者: Liu J.; Liu J.; Liu J.; Li J.; Li J.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

Active pixel sensor (APS) star tracker becomes an investigated hotspot because of its technical advantages. And centroid algorithm is a subpixel method proper to star position calculation because of its high accuracy and simplicity. When centroid algorithm is applied on APS star tracker APS pixel geometrical characteristics might effect on star image position accuracy. Because the amplifier circuit and other function circuits inter pixel of APS take up some pixel area the Fill Factor is less than 100%. Moreover the active sensitive area has a certain geometrical shape such as square rectangle and L shape. The Fill Factor of pixel influences on star image subdivided locating accuracy when using centioid algorithm. In this paper we have analyzed all pixel geometrical characteristics influence on the star position accuracy. From simulation experiments we can conclude that Fill factor and pixel geometric shape influence on star position accuracy. The star locating error increased when Fill Factor decreased and different geometrical shape of active sensitive area of pixel can make different influence on star location accuracy the symmetrical sensitive area in x or y axis have symmetrical location error in the same axis.