中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共8条，第1-8条

帮助

条数/页：排序方式：
	Effectiveness of farmland transfer in alleviating farmland abandonment in mountain regions SCI/SSCI论文 OAI收割 2016 作者: Shao J. A.; Zhang, S. C.; Li, X. B. \| 收藏 \| 浏览/下载：39/0 \| 提交时间：2017/11/09 land rental market farmland abandonment farming conditions farmland resource optimization mountain region economic-development china transitions area
	Comprehensive Evaluation of Ski Resort Development Conditions in Northern China SCI/SSCI论文 OAI收割 2016 作者: Li Y.; Zhao, M. Y.; Guo, P.; Zheng, J.; Li, Z. H. \| 收藏 \| 浏览/下载：36/0 \| 提交时间：2017/11/09 ski resort development conditions index system evaluation China climate-change tourism snow snowmaking sector alps
	Molecular Weight Dependency of Crystallization and Melting Behavior of beta-Nucleated Isotactic Polypropylene 期刊论文 OAI收割 journal of polymer science part b-polymer physics, 2014, 卷号: 52, 期号: 19, 页码: 1301-1308 Lu, Ying; Wang, Qiao; Men, Yongfeng 收藏 \| 浏览/下载：37/0 \| 提交时间：2015/10/19 Compounds of isotactic polypropylene (iPP) and beta-nucleating agent were used to investigate the relationship between the development of beta phase and molecular weight in iPP under quiescent crystallization conditions by using wide angle X-ray diffraction and differential scanning calorimetry techniques. In all cases the dependency of the formation of beta phase in iPP on molecular weight of iPP at a defined crystallization temperature range was found. The iPP with high molecular weight possessed a wide range of crystallization temperature in inducing rich beta phase. However poor or even no beta phase was obtained for the samples with low molecular weight in the same range. In addition an upper critical crystallization temperature of producing dominant beta phase was found at 125 degrees C. Beyond this temperature a phenomenon of prevailing alpha phase became obvious. (C) 2014 Wiley Periodicals Inc.
	The Roles of Spatial Locations and Patterns of Initial Errors in the Uncertainties of Tropical Cyclone Forecasts CNKI期刊论文 OAI收割 2012 作者: Chen BY(陈博宇); Mu M(穆穆) \| 收藏 \| 浏览/下载：0/0 \| 提交时间：2024/12/18 sensitive area,conditional nonlinear optimal perturbation,CNOP,uncertainty of initial conditions,nonlinear development
	Study of horizontal shafting with spherical four-way structure (EI CONFERENCE) 会议论文 OAI收割 2012 International Conference on Optoelectronics and Microelectronics, ICOM 2012, August 23, 2012 - August 25, 2012, Changchun, China 作者: Yang L.; Yang L. 收藏 \| 浏览/下载：30/0 \| 提交时间：2013/03/25 Altazimuth photoelectric theodolite level shaft U-type and T-type structure but with the expanding field of applications of photoelectric theodolite the horizontal shaft structure occur great changes. For example in the marine environment shipboard conditions the instrument has a waterproof corrosion-resistant easy maintenance and other functions while carrier-based optoelectronic devices from a single visible television configure the development of integrated infrared system and ranging system as one of the single-station measurement system due to the spherical structure has sufficient internal space exactly adapted to this need. In this paper the horizontal axis of a spherical four-way structure. From aspects of the spherical four-way split in the form and shafting design and finite element analysis of the detailed design. A spherical four-way horizontal axis system diameter 550mm weight 19kg sphere in the 40kg load the maximum deformation of 3.3m fully meet the requirements. The shaft of the structure of the shaking is less than 2 arc seconds the vibration test the re-examination instrument accuracy change is less than 1 arc seconds. Verify that the structure is stable and reliable. 2012 IEEE.
	The roles of spatial locations and patterns of initial errors in the uncertainties of tropical cyclone forecasts 期刊论文 OAI收割 ADVANCES IN ATMOSPHERIC SCIENCES, 2012, 卷号: 29, 期号: 1, 页码: 63-78 作者: Chen Boyu; Mu Mu 收藏 \| 浏览/下载：26/0 \| 提交时间：2013/09/24 sensitive area conditional nonlinear optimal perturbation CNOP uncertainty of initial conditions nonlinear development
	Analysis of atmospheric pressure and temperature changes on the image quality of aerial camera (EI CONFERENCE) 会议论文 OAI收割 2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011, August 19, 2011 - August 22, 2011, Jilin, China Dong B.; Tian H.-Y. 收藏 \| 浏览/下载：27/0 \| 提交时间：2013/03/25 This paper starts from the study of the aerial camera's work environment analyzes the temperature and atmosphere pressure changes on aerial camera's imaging quality of influence. Point out that when the altitude of the camera changes atmospheric pressure and temperature of constant change so the camera's optical focal surface position changes thus affecting the image quality of the camera causing changes in the camera's focal surface optical and affecting the camera's image quality. Summarize the rules that the temperature and pressure influence the image quality of the camera in aerial environment. Analyze the various environmental conditions on the impact of camera's image quality. For different types of camera put forward the corresponding convergence compensation method and provides a reference value to the development of the aerial camera. 2011 IEEE.
	Support technique of ultra thin mirror in space optics (EI CONFERENCE) 会议论文 OAI收割 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, November 2, 2005 - November 5, 2005, Xian, China 作者: Ren J.-Y.; Gao M.-H. 收藏 \| 浏览/下载：34/0 \| 提交时间：2013/03/25 With the development of space optical system the technique of ultra thin mirror come forth and is paid more attention because of less difficulty in machining low cost lightweight no disassembly during detecting and maintaining. The key technique takes advantage of deformation of ultra thin mirror as the influence of environment to adjust the surface figure. Its accuracy meets requirement. An analysis method is based on finite element analysis (FEA) and many items including the amount of support points the way of arrangement the optimum design of support component are studied. The finite element method was used to analyze the mirror and some different mirror support schemes. The principal aim of the mirror analysis is to get numbers of support points and the ways of the support. There are three schemes including 12-6-1 12-8-1 and 16-8-1 models. Deformation of deadweight is calculated under the three conditions. The way of 16-8-1 is more suitable than the designs of other two. The support subassembly is amended to meet with the mirror surface RMS in the range of 30m. Deformation of the mirror with support structure has been calculated. The result is 16.52nm lower than a quarter of the wavelength which indicates the feasibility of the support scheme applied to mirror. Theoretical result for the best way of support is presented. The result of analysis shows that requirement surface figure could be met through adjusting support points. It predicts feasibility of the support technique and provides theoretical value for active adjustment in the laboratory. At present support and adjusting experiment of ultra thin mirror is being carried on.