机构

• 烟台海岸带研究所 [2]
• 长春光学精密机械与物... [1]
• 地球环境研究所 [1]

采集方式

• OAI收割 [4]

内容类型

• 期刊论文 [3]
• 会议论文 [1]

发表日期

• 2012 [1]
• 2011 [2]
• 2009 [1]

学科主题

• Environmen... [2]
• Engineerin... [1]

筛选

浏览/检索结果: 共4条，第1-4条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Study on ultra-light secondary baffle for coaxial two-mirror telescope (EI CONFERENCE) 会议论文  OAI收割 2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China 作者:  Zhang L.;  Zhang L. 收藏  |  浏览/下载：63/0  |  提交时间：2013/03/25 The coaxial two-mirror telescope consists of two mirrors facing each other. Classical two-mirror arrangements are Gregorian and Cassegrain. These systems are usually applied to space telescopes and often have optical baffles to prevent stray light from entering the focal plane. The optical baffles consist of concentric rings suspended between the secondary and the primary mirror. The secondary baffle for a large two-mirror optical system is designed and analyzed in this paper. According to mission of a telescope  the structure should have high stiffness and high reliability and light weight. Compared with invar  aluminum alloy and titanium alloy  carbon fiber composite is currently the best material in terms of weight-to-strength ratio. It also has advantages of high temperature tolerance and low thermal expansion. So carbon fiber composite is chosen as material to meet requirements of the coaxial telescope. In this paper  optimization method based on finite element analysis (FEA) is used for design the secondary baffle. Minimum weight of the baffle is chosen as an objective function. Thicknesses of former tube and vanes are chosen as variables. Analysis results show that the designed secondary baffle has maximum diameter of 180mm  total length of 120mm and weighs 142g. And its fundamental frequency reaches 651Hz. Therefore the baffle has many advantages  such as ultra-light weight  high stiffness and dimensional stability  etc. The optimization method and the baffle design can be helpful to other coaxial telescopes  such as Cassegrain  Gregorian and their subdivisions. 2012 IEEE.   Quality assurance and quality control for thermal/optical analysis of aerosol samples for organic and elemental carbon 期刊论文  OAI收割 ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 2011, 卷号: 401, 期号: 10, 页码: 3141-3152 作者:  Fung, KK (Fung, Kochy K.)[3];  Kohl, SD (Kohl, Steven D.)[1];  Watson, JG (Watson, John G.)[1,2];  Chow, JC (Chow, Judith C.)[1,2];  Trimble, DL (Trimble, Dana L.)[1]   |  收藏  |  浏览/下载：25/0  |  提交时间：2019/01/07 Thermal/optical carbon analysis  IMPROVE_Aprotocol  Aerosol  Organic carbon  Elemental carbon  Pyrolysis  Quality assurance  Quality control   Harmonizing Aerosol Carbon Measurements between Two Conventional Thermal/Optical Analysis Methods 期刊论文  OAI收割 ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2011, 卷号: 45, 期号: 7, 页码: 2902-2908 作者:  Zhi, Guorui;  Chen, Yingjun;  Sun, Junying;  Chen, Laiguo;  Tian, Wenjuan   |  收藏  |  浏览/下载：25/0  |  提交时间：2011/07/22 Secondary Organic Aerosol  Thermal-optical Analysis  Elemental Carbon  Particulate Matter  Black Carbon  Chemical-composition  Source Apportionment  Temperature  Particles  Air   Effects of temperature parameters on thermal-optical analysis of organic and elemental carbon in aerosol 期刊论文  OAI收割 ENVIRONMENTAL MONITORING AND ASSESSMENT, 2009, 卷号: 154, 期号: 1-4, 页码: 253-261 作者:  Zhi, Guorui;  Chen, Yingjun;  Sheng, Guoying;  Fu, Jiamo   |  收藏  |  浏览/下载：16/0  |  提交时间：2011/07/05 Thermal-optical Analysis  Temperature  Elemental Carbon  Organic Carbon