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浏览/检索结果: 共10条，第1-10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 Bathyal records of enhanced silicate erosion and weathering on the exposed Luzon shelf during glacial lowstands and their significance for atmospheric CO2 sink 期刊论文  OAI收割 CHEMICAL GEOLOGY, 2018, 卷号: 476, 页码: 302-315 作者:  Xu, Zhaokai;  Li, Tiegang;  Clift, Peter D.;  Wan, Shiming;  Qiu, Xiaohua   |  收藏  |  浏览/下载：30/0  |  提交时间：2018/04/02 Chemical Weathering  Sea Level  East Asian Summer Monsoon  Atmospheric Co2 Concentration  Western Philippine Sea   北极地区和电子垃圾拆解地典型 POPs生物累积放大效应 学位论文  OAI收割 博士, 北京: 中国科学院研究生院, 2015 作者:  朱超飞 收藏  |  浏览/下载：129/0  |  提交时间：2016/08/15 持久性有机污染物  北极  电子垃圾拆解地  浓度水平  营养级放大，POPs  the Arctic  E-waste recycling region  concentration level  trophic magnification   Ozone concentrations, flux and potential effect on yield during wheat growth in the Northwest-Shandong Plain of China SCI/SSCI论文  OAI收割 2015 作者:  Zhu Z. L.;  Sun, X. M.;  Zhao, F. H.;  Meixner, F. X. 收藏  |  浏览/下载：34/0  |  提交时间：2015/12/09 Ozone concentration  Ozone flux  Deposition velocity  Eddy covariance  Yield loss estimation  Cropland ecosystem  agricultural crop yields  yangtze-river delta  ground-level ozone  surface ozone  winter-wheat  dry deposition  european wheat  long-term  impact  exposure   不同氮效率基因型冬小麦物质生产对CO2浓度升高的响应研究 期刊论文  OAI收割 中国生态农业学报, 2012, 卷号: 20, 期号: 04, 页码: 459-465 沈玉芳; 许育彬; 王佩玲; 李世清 收藏  |  浏览/下载：35/0  |  提交时间：2014/08/27 CO2浓度倍增  Di-atmospheric CO2 concentration  氮素水平  Nitrogen level  冬小麦  Winter wheat  物质生产  Matter production  氮效率  Nitrogen efficiency  产量  Yield   Screening level ecological risk assessment for phenols in surface water of the Taihu Lake 期刊论文  OAI收割 CHEMOSPHERE, 2010, 卷号: 80, 期号: 9, 页码: 998-1005 作者:  Wang, Donghong 收藏  |  浏览/下载：16/0  |  提交时间：2015/07/31 Phenols  Concentration  Ecological risk assessment  Screening level  Taihu Lake   Assessment of pH and soil degradation: Case of Rwanda tea growing areas 会议论文  OAI收割 2010 2nd IITA International Conference on Geoscience and Remote Sensing, Qingdao, China, 2010 De La Paix; Mupenzi Jean1; Ge; Jiwen1; Li; Lanhai2; Habiyaremye; Gabriel1; Theoneste; Nzayisenga3; Emmanuel; Kamanzi3 收藏  |  浏览/下载：21/0  |  提交时间：2011/08/23 Soils - Degradation - Geology - Magnesium - Manganese - Nitrogen fertilizers - Potassium - Remote sensing - Sodium - Soil surveys - Base elements - Heavy materials - High concentration - Low level - Soil degradation - Soil sample - Tea plantations   Concentration Levels and Potential Ecological Risks of Polycyclic Aromatic Hydrocarbons in Chinese Rivers 期刊论文  OAI收割 WATER QUALITY EXPOSURE AND HEALTH, 2009, 卷号: 1, 期号: 2, 页码: 105-113 作者:  Feng, Chenglian;  Luo, Qian;  Wang, Zijian 收藏  |  浏览/下载：46/0  |  提交时间：2015/08/13 Polycyclic aromatic hydrocarbons (PAHs)  Chinese rivers  Concentration level  Geographic distribution  Ecological risk   Modeling the maximum apparent quantum use efficiency of alpine meadow ecosystem on Tibetan Plateau SCI/SSCI论文  OAI收割 2007 Xu L. L.; Zhang X. Z.; Shi P. L.; Li W. H.; He Y. T. 收藏  |  浏览/下载：14/0  |  提交时间：2012/06/08 maximum apparent quantum use  efficiency (alpha(0))  stand level  modeling Eddy covariance  alpine meadow  Tibet plateau  co2 concentration  flux measurements  winter-wheat  yield  photosynthesis  assimilation  atmosphere  leaves  c-3   Energy transfer processes on both Er+ ion concentration and excitation densities in Yb3+-Er3+ codoped LaF3 matrix (EI CONFERENCE) 会议论文  OAI收割 作者:  Zhang J.;  Wang Y.;  Wang Y.;  Wang Y.;  Zhang J. 收藏  |  浏览/下载：20/0  |  提交时间：2013/03/25 The effects of both Er3+ ion concentration and excited density upon frequency upconversion fluorescence emissions in Er3+/Yb 3+-codoped LaF3 powder are investigated. The results reveal that a higher Er3+ concentration can induce not only upconversion emission enhancements but also the changes among the relative intensities of the 407  519  539 and 651 nm radiation transitions as the samples are excited within the ranges of 20 to 700 mW with 978 nm laser diode (LD) as an excitation source. The changes are described by a schematic level model with the cross-relaxation processes between Er3+ ions and a series of dynamic equations that take into account the population of temperature dependent in Er3+. 2006 Elsevier B.V. All rights reserved.   Rare-earth doped tungsten tellurite glasses and waveguides: Fabrication and characterization (EI CONFERENCE) 会议论文  OAI收割 Physics of Non-Crystalline Solids 10, October 15, 2004 - October 15, 2004, Parma, Italy 作者:  Chen B.;  Chen B. 收藏  |  浏览/下载：28/0  |  提交时间：2013/03/25 Tungsten tellurite glasses doped with Er3+  Tm3+  Pr3+  and Ho3+ ions were prepared by melt quenching. The glass matrix was the same for all types of glasses and had a high sodium content in order to allow the fabrication of waveguides using an ion-exchange technique. The absorption spectra of the glasses were measured and the Judd-Ofelt parameters q were obtained from the experimental oscillator strengths of the f &rarr f transitions. Er3+ doped glasses showed a very high quantum efficiency when comparing the calculated radiative decay time with the measured lifetime of the 4I 13/2 metastable level. Ag+ Na+ ion-exchanged planar waveguides were successfully obtained in all types of glasses and characterized by the prism coupling technique. It turned out that the diffusion constant values are very similar for glasses containing different rare-earth ions with the same concentration  while  at least for the Er 3+ doped ones  the diffusion constant changes with the ions concentration. 2004 Elsevier B.V. All rights reserved.