中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共7条，第1-7条

帮助

条数/页：排序方式：
	Reentry guidance based on feedback linearization (EI CONFERENCE) 会议论文 OAI收割 2011 International Conference on Electronics, Communications and Control, ICECC 2011, September 9, 2011 - September 11, 2011, Ningbo, China Li D.-W. 收藏 \| 浏览/下载：30/0 \| 提交时间：2013/03/25 This paper presents a new reentry guidance algorithm for RLV (Reusable Launching Vehicle). The algorithm consists of two integrated components: trajectory planning algorithm and tracking algorithm. The most striking feature of algorithm here lies in that both planning and tracking are executed directly in height-velocity space which is different from the methodology of configuration of drag in traditional shuttle guidance. In the session of trajectory planning all trajectory constraints can be expressed with upper bound and lower bound in height-velocity space then a linear interpolation is carried to search the nominal trajectory satisfying the requirement of downrange and target constraints. Then the tracking algorithm uses feedback linearization method to track this nominal profile and meet all constraints. Another typical feature of this algorithm is the strategy of downrange extension using FPA (flight path angle) controller to fulfill the requirement of large downrange. Proper combination of planning-tracking algorithm and FPA controller can bring great flexibility and adaptability to reentry guidance. The algorithm is proved to be robust enough to accommodate the model error and noises in the dynamics. 2011 IEEE.
	Study on optical parts of MOEMS optical switch with low insertion loss (EI CONFERENCE) 会议论文 OAI收割 MEMS/MOEMS Technologies and Applications II, November 10, 2004 - November 12, 2004, Beijing, China 作者: Wang W.; Wang L.; Wang L.; Wang L.; Chen W. 收藏 \| 浏览/下载：32/0 \| 提交时间：2013/03/25 We study insertion losses of optical switch when the laser beam is propagating during the free space between two single mode fibers (SMFs) and the related assemblage challenges Then a new packaging structure is developed for the hybrid-integration of free-space MOEMS (micro-opto-electro-mechanical systems) chip with a silicon micromachined submount to improve alignment accuracy. The submount is designed to accommodate various free-space MOEMS chips with minimal active optical alignment thus reducing the packaging cost. The silicon submount has a central recess to place the MOEMS chip in sixteen V-grooves for optical fibers and micropits for micro ball lenses all bulk micromachined at the same time by a single anisotropic wet etching step. A corner compensation technique is employed to prevent erosion of the convex corners where different geometries meet. Through this assembling method the fiber micro ball lens can be aligned preciously thus reduced lateral and angular misalignment between them. Then total insertion losses can be decreased.
	迎接化学工程的新发展期刊论文 OAI收割化工冶金, 1985, 期号: 03, 页码: 1-16 作者: 郭慕孙收藏 \| 浏览/下载：14/0 \| 提交时间：2014/08/27 化学工程 kinetics branch operations accommodate engineer 学术报告会 preparing providing innovative
	FRACTIONALLY CHARGED COLOR SINGLET FERMIONS AND LOW MASS MAGNETIC MONOPOLES IN SU(9) GRAND UNIFIED MODELS 期刊论文 OAI收割 Science in China;Ser.A, 1983, 期号: 4, 页码: 1189-1197 作者: Dong FX(东方晓); Du DS(杜东生); Xue PY(薛丕友); Zhou XJ(周咸建) 收藏 \| 浏览/下载：9/0 \| 提交时间：2015/12/10 elegant ordinary accommodate fractional singlet noted charges generator broken exotic
	A NEW METHOD FOR FLAVOR UNIFICATIONS 期刊论文 OAI收割 Science in China;Ser.A, 1983, 期号: 5, 页码: 412-417 作者: Zhang YP(章义朋); Xue PY(薛丕友); Zhou XJ(周咸建) 收藏 \| 浏览/下载：14/0 \| 提交时间：2015/12/10 handed currents accommodate symmetry invariant usual breaking unified steps breakdown
	RESIDUAL DISCRETE SYMMETRY AND SU(8) GRAND UNIFIED MODEL 期刊论文 OAI收割 Science in China;Ser.A, 1982, 期号: 6, 页码: 51-58 作者: Du DS(杜东生); Ma ZQ(马中骐); Xue PY(薛丕友) 收藏 \| 浏览/下载：14/0 \| 提交时间：2015/12/10 unified constructing symmetry connected broken accommodate matrices criterion breaking genera
	GENERATION PROBLEM AND SU(7) GRAND UNIFIED THEORIES 期刊论文 OAI收割 Scientia Sinica, 1981, 期号: 6, 页码: 1366-1378 作者: Ma ZQ(马中骐); Du DS(杜东生); Xue PY(薛丕友); Yue ZW(岳宗五) 收藏 \| 浏览/下载：18/0 \| 提交时间：2015/12/10 unified invariant accommodate gauge assignment instead belief steps breaking dimensions