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浏览/检索结果: 共36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发表日期升序发表日期降序提交时间升序提交时间降序作者升序作者降序 The chained effects of earlier vegetation activities and summer droughts on ecosystem productivity on the Tibetan Plateau 期刊论文  OAI收割 AGRICULTURAL AND FOREST METEOROLOGY, 2022, 卷号: 321, 页码: 13 作者:  Chen, Ning;  Zhang, Yangjian;  Song, Changchun;  Xu, Mingjie;  Zhang, Tao   |  收藏  |  浏览/下载：44/0  |  提交时间：2022/09/21 Earlier vegetation activities  Summer drought  Compensate  Carbon uptake  Multiple scales observations  The Tibetan Plateau   The chained effects of earlier vegetation activities and summer droughts on ecosystem productivity on the Tibetan Plateau 期刊论文  OAI收割 AGRICULTURAL AND FOREST METEOROLOGY, 2022, 卷号: 321, 页码: 13 作者:  Chen, Ning;  Zhang, Yangjian;  Song, Changchun;  Xu, Mingjie;  Zhang, Tao   |  收藏  |  浏览/下载：35/0  |  提交时间：2022/09/21 Earlier vegetation activities  Summer drought  Compensate  Carbon uptake  Multiple scales observations  The Tibetan Plateau   The compensation effects of post-drought regrowth on earlier drought loss across the tibetan plateau grasslands 期刊论文  OAI收割 AGRICULTURAL AND FOREST METEOROLOGY, 2020, 卷号: 281, 页码: 20 作者:  Chen, Ning;  Zhang, Yangjian;  Zu, Jiaxing;  Zhu, Juntao;  Zhang, Tao   |  收藏  |  浏览/下载：15/0  |  提交时间：2020/05/19 Alpine grasslands  Compensate  Drought  NEP  NPP  Regrowth   The compensation effects of post-drought regrowth on earlier drought loss across the tibetan plateau grasslands 期刊论文  OAI收割 AGRICULTURAL AND FOREST METEOROLOGY, 2020, 卷号: 281, 页码: 20 作者:  Chen, Ning;  Zhang, Yangjian;  Zu, Jiaxing;  Zhu, Juntao;  Zhang, Tao   |  收藏  |  浏览/下载：46/0  |  提交时间：2020/05/19 Alpine grasslands  Compensate  Drought  NEP  NPP  Regrowth   Synthesis and Thermoelectric Properties of Charge-Compensated SyPdxCo4-xSb12 Skutterudites 期刊论文  OAI收割 ACS APPLIED MATERIALS & INTERFACES, 2018, 卷号: 10, 期号: 1, 页码: 625, 634 作者:  Wan, Shun;  Qiu, Pengfei;  Huang, Xiangyang;  Song, Qingfeng;  Bai, Shengqiang   |  收藏  |  浏览/下载：47/0  |  提交时间：2018/12/28 thermoelectric  skutterudite  charge-compensate  S filling  Pd doping   Environment Effect on Two Way Satellite Time and Frequency Transfer 会议论文  OAI收割 2012 European Frequency and Time Forum, EFTF2012, Gothenburg, Sweden, 2012年4月23-4月27日 Zhang H(张虹) 收藏  |  浏览/下载：24/0  |  提交时间：2013/12/25 TWSTFT  Temperature and humidity  correlation  satellite simulation  compensate   Research on satellite platform vibration compensation technology for space optical communication (EI CONFERENCE) 会议论文  OAI收割 2012 International Meeting on Opto-Electronics Engineering and Materials Research, OEMR 2012, July 27, 2012 - July 29, 2012, Shenyang, Liaoning, China Han C.; Li X. 收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25 The piezo-electric steering control system is used to compensate the vibration of satellite platform. The mathematical model of piezo-electric steering system is built. The adaptive controller based on improved LMS filter algorithm is designed according to this system characteristic. The adaptive delay filter is designed to solve slow convergence speed problem of traditional algorithm. Meanwhile  the adaptive delay filter can also compensate phase delay of control circuit. The adaptive deviation filter is introduced and it effectively compensates the vibration deviation which is low frequency and high amplitude. The experimental results show that the remained errors are rad  which meets space optical communication requirement and proves that this control scheme is valid and feasible. (2012) Trans Tech Publications  Switzerland.   Reliable attitude stability control of quad-rotor based on fault-tolerant approach (EI CONFERENCE) 会议论文  OAI收割 2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China 作者:  Gao Q. 收藏  |  浏览/下载：46/0  |  提交时间：2013/03/25 The reliability flight property has received much attention within the aircraft control community throughout the last decades. In this paper  the fault-tolerant control technique is introduced into the attitude stability control system of a quadrotor UAV in order to compensate the influence of the actuators fault of the aircraft. This control scheme is composed of two components: a robust fault detection module using the modelbased observation approach and a reconfigurable controller. Besides the designing procedure  the theoretical analysis of robustness and stability of the designed FTC scheme are also contained in this article. And finally  the availability of the proposed scheme is verified through numerical simulation. 2012 IEEE.   Analysis on the influence of random vibration on MEMS gyro precision and error compensation (EI CONFERENCE) 会议论文  OAI收割 2011 3rd International Conference on Mechanical and Electronics Engineering, ICMEE 2011, September 23, 2011 - September 25, 2011, Hefei, China 作者:  Li M. 收藏  |  浏览/下载：28/0  |  提交时间：2013/03/25 In order to improve its precision in dynamic environment  a Kalman filter was designed. Firstly  two sets of random drift data of MEMS gyro were respectively analysed  and it was found that the variance of random drift under random vibration significantly increased and its mean also changed. Then calculation results show that attitude angle error under random vibration is 2.6  while in the static test it is 0.25. Analysis on the characteristics of random drift was carried out  and it is found that it can be treated as stable  normally distributed random signal. Finally  a corresponding Kalman filter was designed. The results indicated that after filtering the variance of random drift is reduced to 0.0282  26.4% of pre-filtering and the attitude angle error is reduced to 1.5  57.7% of pre-filtering. The above method can effectively compensate for the attitude angle error of MEMS gyro caused by random vibration. This study can be a reference to the application of low-cost MEMS gyro in aircraft navigation. (2012) Trans Tech Publications  Switzerland.   The application of diagnostic equipment in the Tokamak fusion reaction (EI CONFERENCE) 会议论文  OAI收割 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, November 6, 2011 - November 9, 2011, Beijing, China Zhang B.-S.; Chang J.; Gong X.-Z.; Gan J.-F.; Feng S.-L. 收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25 This paper introduces the infrared optical system in the Tokamak fusion reaction device. In this optical system  3.the relay group lenses. This paper describes the decrease of the modulation transfer function (MTF) when the temperature changes and how to compensate the decrease of the MTF in order to maintain the image quality in a high level. As a result  the traditional optical structure can't meet the requirements  2.the Cassegrain system  the image quality of this optical system can reach the requirements when the temperature changes. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).  because the length of the infrared optical system in the Tokamak is very long. The design of optical system in the detection facility includes three parts:1.the combination of the concave aspheric mirror and flat mirror