中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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CAS IR Grid
机构
地理科学与资源研究所 [1]
长春光学精密机械与物... [1]
西北高原生物研究所 [1]
半导体研究所 [1]
采集方式
OAI收割 [4]
内容类型
会议论文 [2]
SCI/SSCI论文 [1]
期刊论文 [1]
发表日期
2016 [1]
2007 [2]
2002 [1]
学科主题
光电子学 [1]
生物科学::植物学 [1]
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Fewer new species colonize at low frequency N addition in a temperate grassland
SCI/SSCI论文
OAI收割
2016
作者:
Zhang Y. H.
;
Stevens, C. J.
;
Lu, X. T.
;
He, N. P.
;
Huang, J. H.
收藏
  |  
浏览/下载:41/0
  |  
提交时间:2016/12/16
acidification
ammonium accumulative
biodiversity
ecological
processes
interspecific competition
nitrogen addition frequency
nitrogen deposition
species turnover
inner-mongolia grasslands
nitrogen deposition
productivity gradient
biodiversity loss
plant diversity
richness
establishment
limitation
light
cycle
Interannual fluctuations in floral longevity, pollinator visitation and pollination limitation of an alpine plant (Gentiana straminea Maxim., Gentianaceae) at two altitudes in the Qinghai-Tibetan Plateau
期刊论文
OAI收割
plant systematics and evolution, 2007, 卷号: 267, 期号: 1-4, 页码: 255-265
作者:
Duan, Y.-W.
;
Zhang, T.-F.
;
Liu, J.-Q.
收藏
  |  
浏览/下载:70/0
  |  
提交时间:2009/12/07
visiting frequency
bumblebee pollination
pollination limitation
alpine plants
Mid-frequency surface error test with a Foucault apparatus (EI CONFERENCE)
会议论文
OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, July 8, 2007 - July 12, 2007, Chengdu, China
作者:
Li J.
;
Li J.
;
Xuan B.
;
Li J.
收藏
  |  
浏览/下载:17/0
  |  
提交时间:2013/03/25
Testing of mid-frequency surface error is of the first importance for fast optics
especially for large aperture aspherics. Foucault test plays a dominant role for surface error inspection before the digital interferometer age
but it seems to have faded out these days because no quantitative results turn out. However
an interferometer with high resolution CCDs is either unavailable or unaccessible in the process of manufacture. As its advantages are realized and recognized for the second time
Foucault test is going back to the stage again. A new theory of calculating the contrast of the shadow pattern of Foucault test is put forward in this paper and some modifications are discussed upon the analyses of the limitation of traditional Foucault apparatus. A paraboloidal mirror was fabricated and tested by the modified Foucault apparatus whose effect has been proved to be great. The methods of controlling mid-frequency error are described in the other paper at this conference- "Multi-mode combine manufacturing technology for large aperture aspheric mirrors"1.
Choice of calibration equations of the TSM method
会议论文
OAI收割
3rd international conference on microwave and millimeter wave technology, beijing, peoples r china, aug 17-19, 2002
Wang YL
;
Chen ZY
;
Zhu NH
收藏
  |  
浏览/下载:23/0
  |  
提交时间:2010/10/29
calibration
network analyzer
frequency limitation
scattering-parameter measurement
NETWORK-ANALYZER CALIBRATION
TEST FIXTURES