中国科学院机构知识库网格系统: 检索

Paleontologic, paleogeographic, and sedimentologic controls on the spatial-temporal distribution of Permian sponge reefs in South China 期刊论文 OAI收割
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 2024, 卷号: 654, 页码: 20
作者: Tian, Xuesong; Liang, Kun; Vinn, Olev; Chen, Dishu; Zhang, Feng

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收藏 | 浏览/下载：11/0 | 提交时间：2025/03/28

Permian sponge reef South China Frame-building hypercalcified sponge Time-spaced distribution Geological controlled factors Two reef-forming intervals

Improved equations of ground pressure for shallow large-diameter shield tunnel considering multiple impact factors 期刊论文 OAI收割
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 2023, 卷号: 138, 期号: -, 页码: -
作者: Cui, Lan; Yang, Wenyu; Zheng, Junjie; Sheng, Qian

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收藏 | 浏览/下载：22/0 | 提交时间：2023/08/02

Ground pressure Large -diameter shield tunnel Shallow tunnel Two -stage method Non -uniform displacement pattern Multiple impact factors

Determinants of smallholder farmers' choice on mulch film thickness in rural China 期刊论文 OAI收割
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 2021, 页码: 12
作者: Li, Chang; Guo, Jianbing; Xu, Xiangbo; Sun, Mingxing; Zhang, Linxiu

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收藏 | 浏览/下载：39/0 | 提交时间：2021/06/10

Mulch film thickness Heckman two-stage model Influencing factors Recycling

Determinants of smallholder farmers' choice on mulch film thickness in rural China 期刊论文 OAI收割
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 2021, 页码: 12
作者: Li, Chang; Guo, Jianbing; Xu, Xiangbo; Sun, Mingxing; Zhang, Linxiu

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收藏 | 浏览/下载：16/0 | 提交时间：2021/06/10

Mulch film thickness Heckman two-stage model Influencing factors Recycling

Spatiotemporal changes in Chinese land circulation between 2003 and 2013 期刊论文 OAI收割
JOURNAL OF GEOGRAPHICAL SCIENCES, 2018, 卷号: 28, 期号: 6, 页码: 707-724
作者: Wang Yahui; Li Xiubin; Xin Liangjie; Tan Minghong; Jiang Min

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收藏 | 浏览/下载：43/0 | 提交时间：2019/05/30

land circulation rent-free driving factors Heckman two-stage model China

Spatiotemporal changes in Chinese land circulation between 2003 and 2013 期刊论文 OAI收割
JOURNAL OF GEOGRAPHICAL SCIENCES, 2018, 卷号: 28, 期号: 6, 页码: 707-724
作者: Wang Yahui; Li Xiubin; Xin Liangjie; Tan Minghong; Jiang Min

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收藏 | 浏览/下载：18/0 | 提交时间：2019/05/30

land circulation rent-free driving factors Heckman two-stage model China

Spatiotemporal changes in Chinese land circulation between 2003 and 2013 期刊论文 OAI收割
JOURNAL OF GEOGRAPHICAL SCIENCES, 2018, 卷号: 28, 期号: 6, 页码: 707-724
作者: Wang Yahui; Li Xiubin; Xin Liangjie; Tan Minghong; Jiang Min

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收藏 | 浏览/下载：25/0 | 提交时间：2019/05/30

land circulation rent-free driving factors Heckman two-stage model China

The investigation of point defect modes of phononic crystal for high Q resonance (EI CONFERENCE) 会议论文 OAI收割
2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11, June 5, 2011 - June 9, 2011, Beijing, China
作者: Liu J.; Liu J.; Liu J.; Li F.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

Point defect cavity was constructed in a two-dimensional phononic crystal plate. It was excited by a small piezo chip in the cavity and the vibration of each point defect modes were detected by an optical interferometer. Point defect modes on 2D PC plate in vacuum air and loaded with water were investigated theoretically and experimentally to make clear of Q factors which are affected by inner attenuation band gap effects and medium. The way to get high Q resonance has been found. It helps to design a new kind of resonator or sensor. 2011 IEEE.

MAC protocol with dynamic priority adjustment for light trail networks (EI CONFERENCE) 会议论文 OAI收割
Network Architectures, Management, and Applications VIII, December 8, 2010 - December 12, 2010, Shanghai, China
作者: Fang W.; Li S.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

In order to improve the wavelength utilization as well as the fairness of the light trail networks we modified the FP MAC from the view point of weight balance by introducing a weight mode. The weight mode is composed of two factors real-time factor and node activity ratio. Moreover the weight mode is used as a bid by each LT node to compute the priority. Hence the priority of the LT node is adjusted dynamically in every round and the MAC protocol with dynamic priority adjustment is entitled as DPA MAC. Simulation results show that the performances of DPA MAC protocol are much better than that of FP MAC protocol in terms of packet loss rate and activity percentile. 2011 Copyright SPIE - The International Society for Optical Engineering.

Evaluation of the operating range for ground-based infrared imaging tracking system (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: Zhang Z.-D.

收藏 | 浏览/下载：48/0 | 提交时间：2013/03/25

Ground-based infrared imaging tracking system (GIITS) is of great importance for aerial target warning and guard. The operating range is one of the key performance specifications on the other which should be calculated calculate the radiation power received on the detector in order to analysis whether the output signal meets the detection requirements or not analyzed and studied during the whole GIITS design process. The operating range is mostly influenced by a few factors without considering the effect of the background radiation. By improving of the traditional method including atmospheric attenuation a new operating range calculation model of the GIITS was established based on two requirements. One is that the image size of observed target should meet the requirement of the processor signal extraction. The number of the pixel occupied by target image should be more than 9. The other is that the signal noise ratio (SNR) of the GIITS should not be less than 5 to meet the requirements of the target detection probability and spatial frequency. The SNR calculation equation in form of energy is deduced and the radiation characteristic of the observed target and background are analyzed. When evaluate the operating range of the GIITS using the new method the performance of GIITS and feature of target and background. This paper firstly makes analysis and summarization on the definite localizations of the traditional operating range equation of the GIITS. The localizations are mainly in two aspects. On one hand we should successively calculate two operating range values according to two requirements mentioned above and choose the minimum value as the analytic result. In the end the dispersion of the image and the effect of image dispersion are not considered in the traditional method an evaluation of operating range for fighter aircraft is accomplished as an example. The influence factors in every aspect on operating range were explored by the calculated result. The new operating range calculation model provides the theoretical basis for the design and applications as well as the comprehensive evaluation of a GIITS. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).