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浏览/检索结果: 共18条，第1-10条 帮助

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Temporal patterns of algae in different urban lakes and their correlations with environmental variables in Xi'an, China 期刊论文  OAI收割
JOURNAL OF ENVIRONMENTAL SCIENCES, 2023, 卷号: 133, 页码: 138-151
作者:  Chen, Shengnan;  Liu, Hanyan;  Zhang, Haihan;  Li, Kai;  Wang, Na
  |  收藏  |  浏览/下载：20/0  |  提交时间：2024/09/10
Soil Fungal Community Composition, Not Assembly Process, Was Altered by Nitrogen Addition and Precipitation Changes at an Alpine Steppe 期刊论文  OAI收割
FRONTIERS IN MICROBIOLOGY, 2020, 卷号: 11
作者:  Xiao, Yuanming;  Li, Changbin;  Yang, Yang;  Peng, Yunfeng;  Yang, Yuanhe
  |  收藏  |  浏览/下载：18/0  |  提交时间：2020/11/25
Soil Fungal Community Composition, Not Assembly Process, Was Altered by Nitrogen Addition and Precipitation Changes at an Alpine Steppe 期刊论文  OAI收割
FRONTIERS IN MICROBIOLOGY, 2020, 卷号: 11
作者:  Xiao, Yuanming;  Li, Changbin;  Yang, Yang;  Peng, Yunfeng;  Yang, Yuanhe
  |  收藏  |  浏览/下载：10/0  |  提交时间：2022/03/01
Driving Factors That Reduce Soil Carbon, Sugar, and Microbial Biomass in Degraded Alpine Grasslands 期刊论文  OAI收割
RANGELAND ECOLOGY & MANAGEMENT, 2019, 卷号: 72, 期号: 2
作者:  Zhang, Rui;  Bai, Yanfu;  Zhang, Tao;  Henkin, Zalmen;  Degen, A. Allan
  |  收藏  |  浏览/下载：34/0  |  提交时间：2019/11/26
Responses of Soil Micro-Food Web to Land Use Change from Upland to Paddy Fields with Different Years of Rice Cultivation 期刊论文  OAI收割
PEDOSPHERE, 2017, 卷号: 27, 期号: 1, 页码: 155-164
作者:  Lu Ying;  Bai Wei;  Wang Xuefeng;  Cai Qian;  Liang Wenju
  |  收藏  |  浏览/下载：12/0  |  提交时间：2021/02/02
Plant functional diversity mediates the effects of vegetation and soil properties on community-level plant nitrogen use in the restoration of semiarid sandy grassland 期刊论文  iSwitch采集
ECOLOGICAL INDICATORS, 2016, 卷号: 64, 页码: 272-280
作者:  Zuo, Xiaoan;  Zhang, Jing;  Lv, Peng;  Zhou, Xin;  Li, Yulin
收藏  |  浏览/下载：49/0  |  提交时间：2019/10/09
Plant functional diversity enhances associations of soil fungal diversity with vegetation and soil in the restoration of semiarid sandy grassland 期刊论文  iSwitch采集
ECOLOGY AND EVOLUTION, 2016, 卷号: 6, 期号: 1, 页码: 318-328
作者:  Zuo, Xiaoan;  Wang, Shaokun;  Lv, Peng;  Zhou, Xin;  Zhao, Xueyong
收藏  |  浏览/下载：36/0  |  提交时间：2019/10/09
Modeling and variable structure control of a vehicle flexible manipulator (EI CONFERENCE) 会议论文  OAI收割
10th World Congress on Intelligent Control and Automation, WCICA 2012, July 6, 2012 - July 8, 2012, Beijing, China
作者:  Wang Z.;  Li Y.;  Li Y.;  Li Y.;  Li Y.
收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25
In this paper  the mathematical modeling and the application of a new trajectory tracking control technique for hydraulic-driven rigid-flexible manipulator are concerned. To get a closer dynamic behavior of the real system  both the flexible manipulator linkage and the actuator dynamics are considered. The exact dynamic model of flexible manipulator is derived using Lagrange principle and assumed modes method. The partial decoupled dynamic equation is derived using nonlinear decoupling feedback control method. The whole dynamic model is established by a driven Jacobin matrix  which represents the coupling between hydraulic servo system and mechanical system. A variable structure controller with inverse dynamics is designed for trajectory tracking. To weaken the chattering of control signal  saturation function is used to instead of sign function. The experimental results investigate the effectiveness of the proposed approaches. 2012 IEEE.  
水土保持背景下黄土丘陵区农业产业资源系统耦合关系研究——基于农户行为的视角 期刊论文  OAI收割
中国生态农业学报, 2012, 卷号: 20, 期号: 03, 页码: 369-377
夏自兰; 王继军; 姚文秀; 吕明权
收藏  |  浏览/下载：37/0  |  提交时间：2014/06/24
Study on navigation control method for CyberCar based on machine vision (EI CONFERENCE) 会议论文  OAI收割
2007 IEEE International Conference on Robotics and Biomimetics, ROBIO, December 15, 2007 - December 18, 2007, Yalong Bay, Sanya, China
Zhang R.-H.; Wang R.-B.; You F.; Jia H.-G.; Chen T.
收藏  |  浏览/下载：28/0  |  提交时间：2013/03/25
The guiding principle and composition of CyberCar based on machine vision was introduced. Applying IM sequence signals as input response signals and least squares method to establish the dynamic equation for CyberCar steering system by system identification experiments firstly  and then combined with the preview kinematics model and two-degree steering dynamic model of vehicle. Therefore  it can trace the path steadily and reliably. 2008 IEEE.  the steering control mathematics model based on preview kinematics for CyberCar was established. And then the switching hyper plane is designed by applying the optimal control theory  during the change of the curve curvature radius is little  the curve tracking of the intelligent vehicle is carried out by adopting sliding variable structure controller. Aim at the parameter uncertainty of tire  a vehicle steering system uncertain model was founded and analyzed. A H optimal controller is designed with the method of H control theory to solve the problem about model uncertainty. The simulation and experiment results show that the controller designed by the proposed method has good robustness and adaptability