中国科学院机构知识库网格系统: 检索

Vegetation and climate change during Marine Isotope Stage 3 in China SCI/SSCI论文 OAI收割
2014
作者: Zhao Y.; Li Q.; Li Q.; Zhao Y.

收藏 | 浏览/下载：169/0 | 提交时间：2014/12/24

Fossil pollen MIS 3 Vegetation change Climatic controls China last 50 loess plateau environmental-changes northwestern alaska tengger desert ice-core record lake bp history 000 years

Vegetation and climate change during Marine Isotope Stage 3 in China 期刊论文 OAI收割
Chinese Science Bulletin, 2014, 卷号: 59, 期号: 33, 页码: 4444-4455
作者: Zhao Y.; Yu Z. C.; Herzschuh U.; Yang B.; Zhao H.

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收藏 | 浏览/下载：16/0 | 提交时间：2014/12/24

Fossil Pollen Mis 3 Vegetation Change Climatic Controls China Loess Plateau Last 50 Environmental-changes 000 Years Northwestern Alaska Tengger Desert Ice-core Record Lake Bp History

The streamflow trend in Tangwang River basin in northeast China and its difference response to climate and land use change in sub-basins SCI/SSCI论文 OAI收割
2013
Liu W. B.; Cai T. J.; Fu G. B.; Zhang A. J.; Liu C. M.; Yu H. Z.

收藏 | 浏览/下载：18/0 | 提交时间：2014/12/24

Hydro-climatic trend Kendall's test Land use change SWAT Tangwang River basin Northeast China last 50 years loess plateau yellow-river variability impacts precipitation runoff availability oscillation temperature

Responses of natural runoff to recent climatic variations in the Yellow River basin, China SCI/SSCI论文 OAI收割
2013
作者: Zhang Z.; Tang Q.

收藏 | 浏览/下载：18/0 | 提交时间：2014/12/24

past 50 years reference evapotranspiration water discharge last half trends variability impacts evaporation streamflow surface

Relationship between species diversity and ecotope diversity 期刊论文 OAI收割
ECOLOGICAL COMPLEXITY AND SUSTAINABILITY, 2010, 卷号: 1195, 期号: S1, 页码: E40-E51
Yue Tianxiang; Li Qiquan

收藏 | 浏览/下载：152/22 | 提交时间：2011/03/30

AGRICULTURAL LAND-USE YELLOW-RIVER DELTA LAST 50 YEARS LANDSCAPE STRUCTURE HABITAT HETEROGENEITY ECOLOGICAL DIVERSITY BIODIVERSITY RICHNESS COMMUNITIES PATTERNS

Precipitation and temperature trends for the Southwest China: 1960-2007 SCI/SSCI论文 OAI收割
2010
Qin N. X.; Chen X.; Fu G. B.; Zhai J. Q.; Xue X. W.

收藏 | 浏览/下载：26/0 | 提交时间：2012/06/08

Mann-Kendall test climate change trend analysis precipitation temperature Southwest China yellow-river basin last 50 years tibetan plateau anthropogenic aerosols climatic variability impacts

Long-Term Temporal Variation of Extreme Rainfall Events in Australia: 1910-2006 SCI/SSCI论文 OAI收割
2010
Fu G. B.; Viney N. R.; Charles S. P.; Liu J. R.

收藏 | 浏览/下载：19/0 | 提交时间：2012/06/08

nino southern-oscillation high-intensity rainfalls quality data set last 50 years united-states precipitation events climatic variability regional rainfall western-australia yellow-river

Space optics remote sensor focusing components mechanics characteristic analysis based on FEM (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors, June 17, 2009 - June 19, 2009, Beijing, China
作者: Wang B.; Ren J.-Y.

收藏 | 浏览/下载：157/0 | 提交时间：2013/03/25

Space optical remote sensor is very important in many fields of science and military significance. It is widely applied. Space optical remote sensor design and manufacturing require precision and stability. Focusing mechanics is an important component of remote sensors. Focusing mechanics can guarantee the stability of the entire mechanics focusing accuracy therefore the stability of research focusing mechanics is very important. In order to guarantee the space optics remote sensor focusing mechanics the stability takes steps the space optics remote sensor focusing organization mechanics characteristic analysis from the classics contact theory. This article uses international general non-linear finite element analysis software ABAQUS to carry on mechanics characteristic analysis to the space optics remote sensor focusing mechanics. First acts according to the focusing mechanics unique feature carries on the finite element to the structural model the grid division the material attribute disposition and the boundary condition indeed grades. Then establishment contact non-linear finite element model and to focusing organization finite element model infliction unit action. Like this contacts the result and the equivalent static analysis result which the nonlinear analysis obtains carries on the contrast and the analysis. This article last count result modality is 90HZ satisfies the space optics remote sensor structure overall modality to request to be bigger than 50HZ.This article when carries on the dynamic analysis extracts the structure kinetic energy and the acceleration curve. In the dynamic analysis obtained transient response analysis modality 70.5Hz this also is bigger than 50HZ. The dynamic analysis indicated the structure dynamic stability has the distinct enhancement has provided certain foundation for the space optics remote sensor following development work reduced the overall system development cycle. 2009 SPIE.

Study of microsphere plate photomultiplier tube (EI CONFERENCE) 会议论文 OAI收割
ICO20: Remote Sensing and Infrared Devices and Systems, August 21, 2005 - August 26, 2005, Changchun, China
作者: Wang X.; Li Y.; Li Y.; Li Y.; Li Y.

收藏 | 浏览/下载：32/0 | 提交时间：2013/03/25

The photomultiplier tube (PMT) that can work in different wavelength is an important detector device in remote sense technology. Microsphere plate using glass beads 50to 70m in diameter sintered together is the core component of the microsphere plate photomultiplier tube It is a novel two-dimension electron multiplier. The electrons gain for a single plate is about 1017 and do not have the phenomenon of ion-feedback. Furthermore the fabrication process is very easy. In this paper much interest was put on the microsphere plate photomultiplier tube. Based on the analyses from the theory and the experiment result we point out the key technology for fabricating PMT is how to obtain glass beads with narrow range in diameter and how to sinter the glass beads with a sufficient pylome. Factors affect the gradating technology and sintering process along with the solution to them is presented. In the last the structure scheme and technological characteristic for fabricating microsphere plate photomultiplier tube were given. The pulse rising-time of MSP-PMT is below 400ps suitable to the detection of high-speed pulse. As easy to be fabricated and has great advantage over MCP multiplier in the ratio of performance to price the microsphere plate photomultiplier tube is a promising dim-light detector.

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：29/0 | 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.