中国科学院机构知识库网格
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浏览/检索结果: 共7条,第1-7条 帮助

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Dendrobium niveolabium (Orchidaceae, section Grastidium), a new Dendrobiinae species from Papua, Indonesia 期刊论文  OAI收割
PHYTOTAXA, 2021, 卷号: 490, 期号: 3, 页码: 271-277
作者:  
Naive, Mark Arcebal K.;  Handoyo, Frankie;  Ormerod, Paul;  Champion, Jeffrey
  |  收藏  |  浏览/下载:20/0  |  提交时间:2021/04/21
New and noteworthy species of Begonia (Begoniaceae) from Vietnam and Laos 期刊论文  OAI收割
PHYTOTAXA, 2021, 卷号: 522, 期号: 2, 页码: 75-93
作者:  
Averyanov,Leonid,V;  Nuraliev,Maxim S.;  Konstantinov,Eugene L.;  Maisak,Tatiana,V;  Kopylov-Guskov,Yury O.
  |  收藏  |  浏览/下载:42/0  |  提交时间:2022/04/02
Bulbophyllum yarlungzangboense (Orchidaceae; Epidendroideae; Malaxideae), a new species from Tibet, China 期刊论文  OAI收割
PHYTOTAXA, 2019, 卷号: 404, 期号: 2, 页码: 79-84
作者:  
Li, Jian-Wu;  Wang, Xi-Long;  Wang, Cheng-Wang;  Pan, Bo;  Song, Zhu-Qiu
  |  收藏  |  浏览/下载:22/0  |  提交时间:2022/01/06
A new algorithm for solving the best-fit sphere of optical aspherical surface (EI CONFERENCE) 会议论文  OAI收割
2nd International Conference on Advances in Materials and Manufacturing, ICAMMP 2011, December 16, 2011 - December 18, 2011, Guilin, China
作者:  
Lin J.;  Lu M.
收藏  |  浏览/下载:40/0  |  提交时间:2013/03/25
To solve the best-fit sphere (BFS) accurately is one of the technological keys for the generating and testing of optical aspherical surfaces. This paper presents a new algorithm for solving the BFS of aspherical surfaces to suppress some deficiencies in the existing BFS algorithms. In the proposed approach  it is not only suitable for the conic surface  a BFS is constructed  but also for higher order aspheres. The obtained asphericity and material removal function is more suitable for the machining and test. (2012) Trans Tech Publications  which passes through both sides of endpoints in the section o -?xy of the aspherical surfaces  Switzerland.  the center of the BFS is shifted along the x-axis  and its radius of curvature is automatically computed. The variable step size method is proposed to speed up the convergence of the iteration. Through numerically solving the BFS of conic and cubic surface  the advantages of the proposed approach are verified. The results show that the proposed approach is of rapid convergence  and high accuracy  
Pararuellia glomerata (Acanthaceae), a new species from Yunnan, China 期刊论文  OAI收割
BOTANICAL STUDIES, 2009, 卷号: 50, 期号: 2, 页码: 261-267
作者:  
Chen, Wen-Hong;  Shui, Yu-Min;  Sima, Yong-Kang;  Zhang, Rong-Mei;  Wei, Zhi-Dan
  |  收藏  |  浏览/下载:19/0  |  提交时间:2011/12/20
Dome design and coupled thermal-mechanical analysis of supersonic missile (EI CONFERENCE) 会议论文  OAI收割
2009 International Conference on Optical Instruments and Technology, OIT 2009, October 19, 2009 - October 22, 2009, Shanghai, China
Xing-qiao A.; Qun W.; Hong-guang J.
收藏  |  浏览/下载:58/0  |  提交时间:2013/03/25
A review of high-speed flow pressure and aerodynamic heating effect on Supersonic missile's dome is given. The dome should have excellent properties in optical  mechanical and chemical characteristics. A design of dome on supersonic mode is described according to tactical guide line of a missile. The dome made of quartz which is about 8mm thick and 141mm in window diameter. To check up the reliability of the dome  a reasonable finite element model (FEM) of dome is established  and a thermal-mechanical Analysis to the dome by finite element software NASTRAN has carried on  through these can obtained the distribution of temperature field and stress field when the speed is 2.3Ma. The results indicated that the stress was concentrated in the joint of the dome end and the Missile Section  and the maximum stress was 16.4Mpa. The stress of other nodes was smaller than the allowable stress of quartz glass. Reference to the results of the analysis  a lightweight revision to the dome structural dimension and a new method of dome fixing have put forward  which can reduce the stress concentration. 2009 SPIE.  
A new section with a new species of anemone (ranunculaceae) from mt. xiaowutai, china 期刊论文  iSwitch采集
Journal of systematics and evolution, 2008, 卷号: 46, 期号: 5, 页码: 738-741
作者:  
Wang, Wen-Tsai;  Liu, Bing
收藏  |  浏览/下载:33/0  |  提交时间:2019/05/10