中国科学院机构知识库网格系统: 检索

Time-evolution of a trapped Bose-Einstein Condensation in a quantum cavity - art. no. 60282E 会议论文 OAI收割
2005
作者: Zhang L.; Wang C.; Zhang L.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/28

Investigation of growth mode in ZnO thin films prepared at different temperature by plasma-molecular beam epitaxy (EI CONFERENCE) 会议论文 OAI收割
13th International Conference on Molecular Beam Epitaxy, August 22, 2004 - August 27, 2004, 13th International Conference on Molecular Beam Epitaxy, August 22, 2004 - August 27, 2004
Liang H. W.; Lu Y. M.; Shen D. Z.; Yan J. F.; Li B. H.; Zhang J. Y.; Liu Y. C.; Fan X. W.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

High-quality ZnO thin films on c-plane sapphire (Al2O 3) substrates were prepared by plasma-molecular beam epitaxy (P-MBE). The influence of growth temperature on growth mode of ZnO was investigated. Real-time monitored by reflection high-energy electron diffraction (RHEED) images show that below 500 C ZnO thin film was grown by three-dimension (3D) growth mode. While the two-dimension (2D) growth mode was obtained above growth temperature of 650 C. Atomic force microscopy (AFM) images present that the surface morphology of ZnO thin film with 2D growth is improved and X-ray rocking curves (XRC) indicate that the full width at half maximum (FWHM) of the ZnO (0 0 2) peak becomes narrow. From the photoluminescence (PL) spectra ultraviolet (UV) emission peak exhibits obvious blue-shift for the samples grown at lower temperature which is attributed to the effect of the quantum confinement arisen from small crystal grain sizes. The minimum carrier concentration of N=7.661016 cm-3 was obtained in the ZnO thin films with the 2D grown which is closed to that of bulk ZnO. 2005 Elsevier B.V. All rights reserved.

Study on LD-pumped Nd : YAG laser cutter - art. no. 60282F 会议论文 OAI收割
2005
作者: Zhang J.; Zhang J.; Zhang J.; Zhao J.

收藏 | 浏览/下载：4/0 | 提交时间：2013/03/28

Research on LD-pumped dual wavelength Nd : YAG laser with high beam quality for machining - art. no. 60282G 会议论文 OAI收割
2005
作者: Zhang J.; Zhang J.; Zhang J.

收藏 | 浏览/下载：6/0 | 提交时间：2013/03/28

The auto-focus precision analysis of the phase method in the theodolite 会议论文 OAI收割
2005
作者: Zhang T.

收藏 | 浏览/下载：7/0 | 提交时间：2013/03/28

Packaging technology of polymer/Si arrayed waveguide grating and their environmental stability (EI CONFERENCE) 会议论文 OAI收割
2005 6th International Conference on Electronics Packaging Technology, August 30, 2005 - September 2, 2005, Dameisha, Shenzhen, China
作者: Zhang Y.; Zhang X.; Zhang X.; Zhang X.; Wang F.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

Future optical communication systems will use more of the exceptional high bandwidth of optical fiber. Wavelength division multiplexing (WDM) systems are well suited to transport terabits of information via the fiber[1]. Multiplexers/ demultiplexers (MUX/DEMUX) are essential components for dense WDM systems. Several different kinds of multiplexer types have been developed in the past: (a) interference filters (b) fiber gratings and (c) planar lightwave circuit (PLC) MUX/DEMUXers[2 3]. The planar fabrication process of the last mentioned PLCs allows the realization of high performance filters with a large number of wavelength channels. Further an integration with other optical elements seems to be possible. Arrayed waveguide gratings (AWG) are a special kind of PLC-MUX/DEMUXers which are very attractive components for WDM systems because of their great flexibility in filter design[4 5]. Basically an AWG is an optical spectrograph built in planar waveguide technique. Typically AWGs works in a high grating order (50-250). For AWG multiplexer applications in communications systems a precise wavelength controllability and wavelength stability with long term is demanded. Recently a polymeric (especially fluorinated polymer with low optical absorption loss in the infrared region) AWG has attracted much attention because of its easy fabrication low cost possibility and a potential of integration with other polymer devices[6]. Standard AWGs however show a change of center wavelength with temperature. A method to prevent this temperature drift is to package the AWG together with a temperature controller in order to tune and fix the desired filter-wavelength. In this paper a 32-channel AWG was fabricated using a cross-linkable fluorinated poly (ether ether ketone) (FPEEK) its package technology and environmental stability were also discussed. 2005 IEEE.

Cultivated land changes in urbanization in Shijiazhuang City of Hebei Province in China 会议论文 OAI收割
Zhang J. Y.; Jia S. F.; Ieee

收藏 | 浏览/下载：10/0 | 提交时间：2012/06/30

cultivated land changes RS GIS urbanization Shijiazhang City Hebei Province China

Measurement of evapotranspiration of mixed bush and grass in headwater region of North China Plain 会议论文 OAI收割
Li F. D.; Zhang Q. Y.; Gao K. C.; Xu Z. Q.; Song X. F.; Ieee

收藏 | 浏览/下载：12/0 | 提交时间：2012/06/30

evapotranspiration Bowen Ratio Penman-Monteith method crop coefficient evaporation forest

Pore size determination of supported organic-inorganic hybrid membranes by modified gas permeation method 会议论文 OAI收割
Shenzhen, PEOPLES R CHINA, MAY 09-12, 2004
作者: Zhang, G. C.; Zhang, B. Q.; Lin, X. P.; Chen, Y. F.; Xie, Y. S.

收藏 | 浏览/下载：20/0 | 提交时间：2014/08/28

Gas Permeation Method Pore Size Determination Modified Organic-inorganic Hybrid Membrane Ceramic Membranes Alumina Stability Layer