中国科学院机构知识库网格系统: 检索

The effects of changes in flowering plant composition caused by nitrogen and phosphorus enrichment on plant-pollinator interactions in a Tibetan alpine grassland 期刊论文 OAI收割
FRONTIERS IN PLANT SCIENCE, 2022, 卷号: 13, 页码: 964109
作者: Wang, Lin-Lin; Ren, Fei; Zhang, Chan; Huang, Xiao-Juan; Zhang, Zhen-Hua

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收藏 | 浏览/下载：19/0 | 提交时间：2024/08/21

climate change grassland ecosystems biodiversity loss nutrition addition pollination network Qinghai-Tibet Plateau BIODIVERSITY LOSS NUTRIENT ENRICHMENT SPECIES LOSS LIMITATION DEPOSITION RESOURCES COMMUNITY SPECIALIZATION DETERMINANTS DECLINES

Global effects of land-use intensity on local pollinator biodiversity 期刊论文 OAI收割
NATURE COMMUNICATIONS, 2021, 卷号: 12, 期号: 1, 页码: 2902
作者: Millard,Joseph; Outhwaite,Charlotte L.; Kinnersley,Robyn; Freeman,Robin; Gregory,Richard D.

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收藏 | 浏览/下载：47/0 | 提交时间：2022/04/02

AGRICULTURAL INTENSIFICATION SPECIES COMPOSITION INSECT DIVERSITY RESPONSES DECLINES IMPACTS PLANTS TRAITS BEES

Assessments of 16 Exploited Fish Stocks in Chinese Waters Using the CMSY and BSM Methods 期刊论文 OAI收割
FRONTIERS IN MARINE SCIENCE, 2020, 卷号: 7, 页码: 10
作者: Zhai, Lu; Liang, Cui; Pauly, Daniel

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收藏 | 浏览/下载：39/0 | 提交时间：2021/04/12

data-poor fisheries Chinese coastal fisheries biomass declines CMSY stock assessments

The Effect of Neonicotinoid Insecticide and Fungicide on Sugar Responsiveness and Orientation Behavior of Honey Bee (Apis mellifera) in Semi-Field Conditions 期刊论文 OAI收割
INSECTS, 2018, 卷号: 9, 期号: 4, 页码: -
作者: Jiang, Xingchuan; Wang, Zhengwei; He, Qibao; Liu, Qiongqiong; Li, Xinyang

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收藏 | 浏览/下载：39/0 | 提交时间：2019/04/22

Declines Survival Exposure

Changes of flowering phenology and flower size in rosaceous plants from a biodiversity hotspot in the past century 期刊论文 OAI收割
SCIENTIFIC REPORTS, 2016, 卷号: 6, 期号: 0, 页码: 28302
作者: Yu, Q (Yu, Qin); Tian, B (Tian, Bin); Yang, YP (Yang, Yong-Ping); Duan, YW (Duan, Yuan-Wen); Yang, YP

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收藏 | 浏览/下载：20/0 | 提交时间：2017/09/27

Pollinated Plants Climate Responses Declines Animals Britain Trends

Effect of Different Fertilizer Application on the Soil Fertility of Paddy Soils in Red Soil Region of Southern China SCI/SSCI论文 OAI收割
2012
Dong W. Y.; Zhang X. Y.; Wang H. M.; Dai X. Q.; Sun X. M.; Qiu W. W.; Yang F. T.

收藏 | 浏览/下载：32/0 | 提交时间：2014/12/25

long-term fertilization organic-matter phosphorus fractions mineral fertilizers subtropical china northeast china yield declines crop yields rice carbon

The ship-borne infrared searching and tracking system based on the inertial platform (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者: Li Y.; Zhang H.; Zhang H.; Li Y.; Li Y.

收藏 | 浏览/下载：36/0 | 提交时间：2013/03/25

As a result of the radar system got interferenced or in the state of half silent it can cause the guided precision drop badly In the modern electronic warfare therefore it can lead to the equipment depended on electronic guidance cannot strike the incoming goals exactly. It will need to rely on optoelectronic devices to make up for its shortcomings but when interference is in the process of radar leading especially the electro-optical equipment is influenced by the roll pitch and yaw rotation it can affect the target appear outside of the field of optoelectronic devices for a long time so the infrared optoelectronic equipment can not exert the superiority and also it cannot get across weapon-control system "reverse bring" missile against incoming goals. So the conventional ship-borne infrared system unable to track the target of incoming quickly the ability of optoelectronic rivalry declines heavily.Here we provide a brand new controlling algorithm for the semi-automatic searching and infrared tracking based on inertial navigation platform. Now it is applying well in our XX infrared optoelectronic searching and tracking system. The algorithm is mainly divided into two steps: The artificial mode turns into auto-searching when the deviation of guide exceeds the current scene under the course of leading for radar.When the threshold value of the image picked-up is satisfied by the contrast of the target in the searching scene the speed computed by using the CA model Least Square Method feeds back to the speed loop. And then combine the infrared information to accomplish the closed-loop control of the infrared optoelectronic system tracking. The algorithm is verified via experiment. Target capturing distance is 22.3 kilometers on the great lead deviation by using the algorithm. But without using the algorithm the capturing distance declines 12 kilometers. The algorithm advances the ability of infrared optoelectronic rivalry and declines the target capturing time by using semi-automatic searching and reliable capturing-tracking when the lead deviation of the radar is great. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Dynamic optimum design and analysis of cam wave generator for harmonic gear drive (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Information and Automation, ICIA 2011, June 6, 2011 - June 8, 2011, Shenzhen, China
Xiao Q.; Han X.; Jia H.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

Mathematical models of structural optimization were established for the cam wave generator then a conceptual model by integrally taking its static and dynamic performance into consideration which satisfied the model acted by four concentrated forces while the dynamic optimum design was carried out. The topology optimization of the cam wave generator was performed based on artificial material density method was obtained. And the size optimization of the cam wave generator was also executed based on the zero-order method in software Ansys after setting up its parameterized model. The optimized results indicate that its final volume declines to 1284.217mm3 from its 1397.830mm3 which reduced by 42.18% than the original volume of cam (2221.224mm3). Simultaneously the static analysis and modal analysis were implemented and the results show that the static and dynamic performance complies with the design requirements proving that the results of dynamic optimum design are reasonable. The optimized results in paper are realizable in engineering. And the study method provides not only a reference to decreasing design mass and lowering inertia of the cam wave generator but also an important basis of lightweight design of harmonic gear drive. 2011 IEEE.

Optical characterization of bare CdSe and CdSe/CdS core/shell nanocrystals (EI CONFERENCE) 会议论文 OAI收割
ICO20: Biomedical Optics, August 21, 2005 - August 26, 2005, Changchun, China
作者: Liu L.; Yu B.; Liu L.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

Thiol-capped CdSe/CdS core/shell nanocrystals (NCs) which show high luminescence quantum yield are synthesized in an aqueous solution. UV-Vis absorption spectroscopy and photoluminescence (PL) spectroscopy are employed to analyze optical characters and stabilities of NCs. Furthermore PL properties are studied in a temperature range between 77K and 300K. The PL peak position of bare CdSe NCs shifts toward shorter wavelengths and the band becomes sharper with decreasing temperature. On the same condition the PL peak position of CdSe/CdS core/shell NCs keeps unconverted nearly with the variation of temperature. Photostability of bare CdSe NCs and CdSe/CdS core/shell NCs are compared under the 325nm laser irradiation. It takes 78 seconds that the PL intensity declines to the half for CdSe NCs but 442 seconds for CdSe/CdS core/shell NCs. The fluorescence decay lifetime increases about six times after overcoating. The results indicate that the CdS shell can improve the low temperature PL stability and photostability of CdSe NCs effectively.

An empirical analysis of China's state-owned forests SCI/SSCI论文 OAI收割
2004
作者: Tao R.

收藏 | 浏览/下载：13/0 | 提交时间：2012/06/08

China forest sector deforestation forest growth declines deforestation growth policy