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]

筛选

浏览/检索结果: 共4条，第1-4条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 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