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浏览/检索结果: 共23条，第1-10条 帮助

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More than two hundred and fifty thousand spectroscopic binary or variable star candidates discovered by LAMOST 期刊论文  OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2019, 卷号: 19, 期号: 5, 页码: 12
作者:  Qian SB(钱声帮);  Shi XD(施相东);  Zhu LY(朱俐颖);  Li LJ(李临甲);  Zhang J(张嘉)
  |  收藏  |  浏览/下载：93/0  |  提交时间：2019/06/11
Physical properties of gamma Doradus pulsating stars and their relationship with long-period delta Scuti variables 期刊论文  OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2019, 卷号: 19, 期号: 1, 页码: 20
作者:  Qian SB(钱声帮);  Li LJ(李临甲);  He JJ(何家佳);  Zhang J(张嘉);  Zhu LY(朱俐颖)
  |  收藏  |  浏览/下载：97/0  |  提交时间：2019/03/04
The Vegetation Dynamics and Climate Change Responses by Leaf Area Index in the Mu Us Desert 期刊论文  OAI收割
Sustainability, 2019, 卷号: 11, 期号: 11, 页码: 13
作者:  D.F.Zheng;  Y.H.Wang;  Y.Y.Shao;  L.X.Wang
  |  收藏  |  浏览/下载：18/0  |  提交时间：2020/08/24
An analysis of first-time and repeat visitors to Korean national parks from 2007 and 2013 期刊论文  OAI收割
Journal of Mountain Science, 2017, 卷号: 14, 期号: 12, 页码: 2527-2539
作者:  Yunseon CHOE;  Michael A. SCHUETT;  Kyu-Won SIM
  |  收藏  |  浏览/下载：140/0  |  提交时间：2017/12/07
ThIs Paper ExamIned VIsiTors To Bukhansan NatiOnal Park In Korea Based On First-time And Repeat vIsitatiOn. Bukhansan NatiOnal Park Is Korea's Most Heavily vIsited NatiOnal Park With Annual vIsitatiOn Of Six milliOn VIsiTors In 2015. Data Used In ThIs Article Were Collected On-site In The Park In 2007 And 2013 By The Korea NatiOnal Park Service (Knps). The Study Variables Included Socio-demographics  Travel Behavior  Motivation  And Satisfaction With Park Attributes  Services And Facilities. Data Were Analyzed By Each Study Year For First-time And Repeat Visitors. Results Showed Significant Differences For Both First-time And Repeat Visitors.On Several Socio-demographic  Travel Behavior  And Motivation Variables Within Each Study Year. For Satisfaction With Park Attributes  Facilities And Services  First-time VisiTors Were Significantly Different From Repeat VisiTors On Seven Variables For Both Years. implicatiOns Are Given Regarding Programs And Services To Improve visiTor satisfactiOn And Sustain The Natural  Cultural And HisTorical Resources At Bukhansan nAtional Park And Other nAtional Parks In Korea. Future Research Suggestions Are Provided To Learn More About visiTor Characteristics  StAndards Of Quality And Preferences In The National Parks.  
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：62/0  |  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.  
Detection of a degenerate companion of the SX phoenicis star KZ Hydrae by studying its long-term variability 期刊论文  OAI收割
ASTRONOMICAL JOURNAL, 2008, 卷号: 135, 期号: 5, 页码: 1958-1967
作者:  Fu, JN;  Khokhuntod, P;  Rodriguez, E;  Boonyarak, C;  Marak, K
收藏  |  浏览/下载：29/0  |  提交时间：2016/04/08
Non-adiabatic oscillations of red giants 期刊论文  OAI收割
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 卷号: 378, 期号: 4, 页码: 1270-1282
作者:  Xiong, D. R.;  Deng, L.
收藏  |  浏览/下载：28/0  |  提交时间：2015/04/20
Non-adiabatic oscillations of red giants 期刊论文  OAI收割
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 卷号: 378, 期号: 4, 页码: 1270-1282
作者:  Xiong, D. R.;  Deng, L.
  |  收藏  |  浏览/下载：23/0  |  提交时间：2017/10/23
Estimating the structure and geometry of winds from luminous blue variables via fitting the continuum energy distributions 期刊论文  OAI收割
ASTROPHYSICAL JOURNAL, 2007, 卷号: 659, 期号: 2, 页码: 1563-1575
作者:  Guo JH(郭建恒);  Li Y(李焱)
收藏  |  浏览/下载：16/0  |  提交时间：2016/04/07
Ccd photometry of candidate RR Lyrae stars in the Sloan Digital Sky Survey 期刊论文  OAI收割
ASTRONOMICAL JOURNAL, 2005, 卷号: 130, 期号: 4, 页码: 1640-1651
作者:  Wu, C;  Qiu, YL;  Deng, JS;  Hu, JY;  Zhao, YH
收藏  |  浏览/下载：22/0  |  提交时间：2017/03/13