中国科学院机构知识库网格系统: 检索

外商直接投资对小岛屿国家经济增长的影响——基于旅游业门槛效应的分析 期刊论文 OAI收割
资源科学, 2020, 卷号: 42, 期号: 11, 页码: 2132
作者: 郭越; 黄友星; 杨宇; 刘曙光; 王畅

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收藏 | 浏览/下载：129/0 | 提交时间：2021/03/15

Small Island States foreign direct investment economic growth tourism development threshold effect 小岛屿国家外商直接投资经济增长旅游业门槛效应

外商直接投资对小岛屿国家经济增长的影响——基于旅游业门槛效应的分析 期刊论文 OAI收割
资源科学, 2020, 卷号: 42, 期号: 11, 页码: 2132
作者: 郭越; 黄友星; 杨宇; 刘曙光; 王畅

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收藏 | 浏览/下载：23/0 | 提交时间：2021/03/15

Small Island States foreign direct investment economic growth tourism development threshold effect 小岛屿国家外商直接投资经济增长旅游业门槛效应

The Fortunian (lowermost Cambrian) Qinscyphus necopinus (Cnidaria, Scyphozoa, Coronatae) underwent direct development 期刊论文 OAI收割
NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN, 2018, 卷号: 289, 期号: 2, 页码: 149-159
作者: Shao, Tiequan; Liu, Yunhuan; Duan, Baichuan; Zhang, Huaqiao （张华侨）; Zhang, Hu

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收藏 | 浏览/下载：54/0 | 提交时间：2019/05/22

Fossil Embryos Olivooids Plesiomorphy Of Metazoan Development Direct Development Cambrian Fortunian Stage South China

The spatial distribution of industries in transitional China: A study of Beijing SCI/SSCI论文 OAI收割
2015
作者: Li J. M.; Zhang, W. Z.; Chen, H. X.; Yu, J. H.

收藏 | 浏览/下载：40/0 | 提交时间：2015/12/09

Industrial spatial pattern The dual power of government and market Transitional economy Beijing foreign direct-investment centrally planned-economy zhongguancun-science-park land-development building-height rent gradients urban location suburbanization guangzhou

Design of semi-physical simulation for small satellite by virtual display (EI CONFERENCE) 会议论文 OAI收割
2011 3rd International Conference on Mechanical and Electronics Engineering, ICMEE 2011, September 23, 2011 - September 25, 2011, Hefei, China
Xu K.; Lv Y.; Jin G.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

Semi-physical simulation of attitude control system is the more synthetically test and verify for designing of small satellite control system. It is an important means of small satellite development. However the results of current semi-physical simulation system have a lot of non-intuitive. Compare with the actual environment the simulation environment still has striking disparity. So the shortcomings affect precision of simulation. Based on the virtual display technology the group semi-physical simulation system has been constructed for attitude control of small satellite due to the combination with xPC real-time environment the simulation computer high-precision single-axis air-bearing turntable reaction wheel air thrust device fiber gyroscopes sensors synchronizer power subsystem and wireless devices virtual display computer etc. Semi-physical simulation achieved the visual simulation in orbit and tracked new information of virtual environment of space into real-time simulation computer. Simulation results show that the simulation system for real-time attitude and orbit position of small satellite semi-physical simulation has an excellent display effect. At the same time Real-time transfuse of orbit information provides a more accurate space environment simulation. The simulation system of small satellite attitude control to design and evaluate the more direct and convenient. (2012) Trans Tech Publications Switzerland.

Nanoscale patterns made by using a 13.5-nm Schwarzschild objective and a laser produced plasma source (EI CONFERENCE) 会议论文 OAI收割
Optical Micro- and Nanometrology IV, April 16, 2012 - April 18, 2012, Brussels, Belgium
作者: Wang X.; Wang X.; Wang X.; Wang Z.; Wang Z.

收藏 | 浏览/下载：37/0 | 提交时间：2013/03/25

Lithium fluoride (LiF) crystal is a very promising candidate as nanometer resolution EUV and soft X-ray detector. Compared with other EUV and soft X-ray detectors charge coupled device and photographic films LiF crystal has high resolution large field of view and wide dynamic range. In this paper using LiF crystal as EUV detector and a Schwarzschild objective (SO) working at 13.5nm as projection optics mesh images with 4.2 m 1.2 m and 800 nm line width and pinhole patterns with 1.5m diameter are acquired in projection imaging mode and direct writing mode respectively. Fluorescence intensity profiles of images show that the resolution of mesh image is 900 nm and the one of pinhole image is 800 nm. In the experiments a spherical condense mirror based on normal incidence type is used to eliminate the damage and contamination on the masks (mesh and pinhole) caused by the laser plasma and the energy density is not decreased compared with that the masks are close to the plasma. The development of the SO the alignment of the objective and the imaging experiments are also reported. 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Direct adaptive fuzzy decentralized control for reconfigurable modular manipulators (EI CONFERENCE) 会议论文 OAI收割
29th Chinese Control Conference, CCC'10, July 29, 2010 - July 31, 2010, Beijing, China
作者: Li Y.; Li Y.; Li Y.; Li Y.; Zhu L.

收藏 | 浏览/下载：32/0 | 提交时间：2013/03/25

A stable direct adaptive fuzzy decentralized control for reconfigurable modular manipulators is proposed to satisfy the concept of modular software. For the development of the decentralized control the dynamics of reconfigurable manipulators is represented as a set of interconnected subsystems. The fuzzy logic systems are introduced to model the unknown dynamics of subsystem and the interconnection term by using adaptive algorithm. Based on Lyapunov stability theorem the stability of the closed-loop systems can be verified. The simulation results are presented to show the effectiveness of the proposed adaptive fuzzy decentralized control schemes.

Alignment of off-axis asphere and compensator with four poles (EI CONFERENCE) 会议论文 OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China
作者: Li J.; Chen Y.; Li J.; Li J.; Wang P.

收藏 | 浏览/下载：58/0 | 提交时间：2013/03/25

Aspheres are utilized widely thanks to the development of optical design manufacture and testing. Compensators are usually necessary when aspheres are under test. The alignment of aspheres and their compensators is a risk because it's tough to check whether the compensators work in right way. A new method of alignment with four poles is put forward in this paper. Optical interval error can be tight while it is quite important due to direct influence on central curvature conic constant and high order coefficients of aspherical surface. A modified on-axis Foucault apparatus is set up since it makes the optical axis visible and helps to control the error of off-axis amount. Some small holes are drilled in the metallic cell of the compensator so that the ends of poles can be stably relied on in order to increase operational repeatability. The method has been carried out practically and it matches the measurement result given by a set of theodolites. 2009 SPIE.

Automatic spin coater for concave spherical substrate (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems, July 8, 2007 - July 12, 2007, Chengdu, China
Fengchao L.; Jingsong G.; Xiaoguo F.; Jingli Z.; Zhijun X.; Jun H.; Fenglin X.; Huiqing W.; Xiaohan L.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

Coating photoresist film with uniform thickness on concave spherical substrate (CSS) is very important for microfabrication of concave spherical optical elements by lithography technique via a laser direct writer for the uneven photoresist film will result in ununiformity of line width so as to influence the characters of optical elements. For improving the uniformity of photoresist film coating on CSS an automatic spin coater was designed. The process and the mathematical model of spin coating for CSS were analyzed. Difficulties for realizing the spin coater consist of the control of multi-axis motion precisely and collaboratively valves on/ff properly and real-timely. A flexible and well-behaved spinning motion system was achieved by tmeans of principal and subordinate CPUs control. The motion program for spin coating could be created and implemented automatically while the pressure and the valves were was watched and controlled in real time. Film coating and laser direct writing experiments on a CSS with aperture equals to 100 mm and radius equals to 370 mm were performed. Photoresist film with uniform thickness on CSS was obtained by selecting proper spin coating parameters such as rotational speed acceleration and viscosity of the photoresist. After development the section analysis by the atomic force microscope showed that photoresist film thickness was about 517 nm in the center and about 520 nm in the edge of substrate the film thickness error was within 1% and the line width was about 6.0 m with steep sides parallel each other. Experimental results indicate that uniform thickness of thin photoresist film has been coated on CSS by the spin coater which contributes to quality improvement of laser direct writing lines on CSS.

Method for the fabrication of isometric mesh on the concave of a spherical substrate (EI CONFERENCE) 会议论文 OAI收割
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies - Advanced Optical Manufacturing and Testing Technologies, November 2, 2005 - November 5, 2005, Xian, China
作者: Feng X.-G.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

Metallic mesh has been widely used in electromagnetic interference windows. While the duty ratio of curved mesh equals to planar mesh' the theory of planar mesh may be applied to curved mesh according to equivalent-circuit model. So the idea that latitude lines intersect latitude lines to form isometric mesh on the concave of a sphere is put forward and the method of fabricating the mesh by concentric optical scan is introduced. The movement parts of equipment consist of an erection turning a horizontal dividing and a pitching dividing spindle. Firstly a spherical substrate is fixed on the horizontal dividing spindle that has been set horizontally on the erect turning spindle the substrate revolves around the axis of the erect spindle the tube of object lens that is fixed on the pitching dividing spindle steps at pitching direction and a revolving circuit of the substrate corresponds to a step of the tube. Gradually a set of latitude lines is attained. Afterward the substrate makes a quarter turn around the horizontal spindle another orientation latitude lines are also gained. Thus the isometric mesh on the concave of a spherical substrate is gained. The process comprises surface cleaning coating photoresist laser direct writing development evaporated film dissolving photoresist and plating. The fabricated spherical mesh has a line width of 7 m and a period of 600m. Experiment shows that infrared transmission and electromagnetism shield efficiency of the metallic mesh are relatively consistent with theoretical value.