中国科学院机构知识库网格系统: 检索

Aridity-Driven Non-Linear Shift of Plant Sodium Allocation Strategy at Regional and Global Scales 期刊论文 OAI收割
GLOBAL ECOLOGY AND BIOGEOGRAPHY, 2025, 卷号: 34, 期号: 3, 页码: e70025
作者: Guo, Hongbo; Zhang, Jiahui; Kang, Xiaoyan; Yu, Cong; He, Nianpeng

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收藏 | 浏览/下载：9/0 | 提交时间：2025/04/21

allocation strategy aridity community trait non-linear response plant sodium spatial variation

Negative Asymmetric Response of Pantropical Gross Primary Productivity to Precipitation Anomalies 期刊论文 OAI收割
EARTHS FUTURE, 2024, 卷号: 12, 期号: 10, 页码: 20
作者: Fan, Lei; Dong, Guanyu; Ciais, Philippe; Xiao, Xiangming; Xiao, Jingfeng

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收藏 | 浏览/下载：5/0 | 提交时间：2024/12/30

tropical carbon cycle climate extremes vegetation productivity non-linear response

Global evidence on the asymmetric response of gross primary productivity to interannual precipitation changes 期刊论文 OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2022, 卷号: 814, 页码: 9
作者: Wang, Yiheng; Xiao, Jingfeng; Li, Xing; Niu, Shuli

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收藏 | 浏览/下载：32/0 | 提交时间：2022/09/21

Asymmetric response Gross primary productivity Precipitation variability Non-linear Climate change Carbon dynamics

Global evidence on the asymmetric response of gross primary productivity to interannual precipitation changes 期刊论文 OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2022, 卷号: 814, 页码: 9
作者: Wang, Yiheng; Xiao, Jingfeng; Li, Xing; Niu, Shuli

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收藏 | 浏览/下载：36/0 | 提交时间：2022/09/21

Asymmetric response Gross primary productivity Precipitation variability Non-linear Climate change Carbon dynamics

Study of non-linear energy response of POLAR plastic scintillators to electrons 期刊论文 OAI收割
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2015, 卷号: 797, 页码: 94-100
作者: Zhang XF(张晓峰); Xiao HL(肖华林); Wu BB(吴伯冰); Zhang, XF; Xiao, HL

收藏 | 浏览/下载：91/0 | 提交时间：2016/04/18

POLAR Non-linear energy response Coincidence Least squares Monte Carlo simulation Birks' constant

Study on response function model for γ-ray scintillation detector 期刊论文 OAI收割
ATOMIC ENERGY SCIENCE AND TECHNOLOGY, 2015, 卷号: 49, 期号: 8, 页码: 1354-1358
作者: Li Z(李哲); Zhang YW(张译文); Sun SF(孙世峰); Wang BY(王宝义); Wei L(魏龙)

收藏 | 浏览/下载：60/0 | 提交时间：2016/04/18

Detector response Gamma ray spectra Gamma-ray energy Interaction mechanisms Non-linear parameters Radiation source Response function models Weighted least squares

The aircraft autopilot design of parameters changing in a wide range (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Zhen D.; Yue Z.

收藏 | 浏览/下载：28/0 | 提交时间：2013/03/25

Autopilot is an important part of aircraft Under the action of the disturbance torque for the flight parameters of aircraft Changing in a wide range the range was about 16km on the basic of analyzing the typical trajectory the max height was about 5100m the trajectory of feature points were selected the deviation of lateral was about 12m taking pitch control loop for example the maximum angle of attack was about 3.6 a sub- PID autopilot was designed using classical control theory the maximum elevator deflection was less than 5 using single-mode Transient suppression method the maximum aileron deflection was less than 2 the overload due to control surface transition deflection was avoided when control parameters changing the maximum roll was less than 5 the verification was done by non-linear simulation. The result showed that: the phase margin of autopilot was greater than 30 the response of overload can accurately track the given overload instruction. An autopilot design method of aircraft of parameter changes in a wide range was provided. 2011 IEEE. the bandwidth was more than 14rad / s the settling time was less than 0.7s the maximum overshoot was 23.3%

Nonlinear control design for system with mechanical resonance based on two tracking-differentiators (EI CONFERENCE) 会议论文 OAI收割
2010 IEEE International Conference on Mechatronics and Automation, ICMA 2010, August 4, 2010 - August 7, 2010, Xi'an, China
作者: Li J.; Li Y.; Li Y.; Li Y.; Li Y.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

A nonlinear control strategy for controlling a motion system with mechanical resonance is presented in this paper. A mathematical model of the servo system is derived according to the parameters of an actual system. By using two Tracking-Differentiators reference input and system output are tracked and their differential signals are given simultaneously. A nonlinear PD control law in velocity loop is designed based on non-smooth feedback. The simulation results show that the control law is superior remarkably in performance to linear PD control law and the classical PID control law. Tracking-Differentiator resolves the contradiction between rapidity and overshoot of system response. The nonlinear PD control law improves system dynamic performance and intensifies the ability of disturbance rejection. The control design achieved in this paper makes the servo system more robust. 2010 IEEE.

Algorithm research of target acquisition for TV tracking system based on Sliding Mode Control (EI CONFERENCE) 会议论文 OAI收割
2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010, August 20, 2010 - August 22, 2010, Chengdu, China
Wu P.; Gao H.-B.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

Target acquisition algorithm based on Sliding Mode Control (SMC) is proposed for TV tracking system. Target acquisition capability and performance are both improved attributing to overcoming the deficiencies of traditional linear control. In this paper sliding surface with variable coefficient and continuous control law without switching is introduced in the SMC controller design. The improved SMC shows better performance compared to basic SMC and full-field acquisition with rapid response and non-overshoot is achieved. The simulation of acquisition shows that the system can acquire a target passing through the view field of 1.53 in the width with an uniform speed of 15 /s while the whole process is in a short settling time and chattering-free and the reaching segment has no overshoot. 2010 IEEE.

Space optics remote sensor focusing components mechanics characteristic analysis based on FEM (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors, June 17, 2009 - June 19, 2009, Beijing, China
作者: Wang B.; Ren J.-Y.; Wang B.

收藏 | 浏览/下载：157/0 | 提交时间：2013/03/25

Space optical remote sensor is very important in many fields of science and military significance. It is widely applied. Space optical remote sensor design and manufacturing require precision and stability. Focusing mechanics is an important component of remote sensors. Focusing mechanics can guarantee the stability of the entire mechanics focusing accuracy therefore the stability of research focusing mechanics is very important. In order to guarantee the space optics remote sensor focusing mechanics the stability takes steps the space optics remote sensor focusing organization mechanics characteristic analysis from the classics contact theory. This article uses international general non-linear finite element analysis software ABAQUS to carry on mechanics characteristic analysis to the space optics remote sensor focusing mechanics. First acts according to the focusing mechanics unique feature carries on the finite element to the structural model the grid division the material attribute disposition and the boundary condition indeed grades. Then establishment contact non-linear finite element model and to focusing organization finite element model infliction unit action. Like this contacts the result and the equivalent static analysis result which the nonlinear analysis obtains carries on the contrast and the analysis. This article last count result modality is 90HZ satisfies the space optics remote sensor structure overall modality to request to be bigger than 50HZ.This article when carries on the dynamic analysis extracts the structure kinetic energy and the acceleration curve. In the dynamic analysis obtained transient response analysis modality 70.5Hz this also is bigger than 50HZ. The dynamic analysis indicated the structure dynamic stability has the distinct enhancement has provided certain foundation for the space optics remote sensor following development work reduced the overall system development cycle. 2009 SPIE.