Results 41 to 50 of about 796 (172)

Comparison of linear and nonlinear active disturbance rejection control method for hypersonic vehicle [PDF]

, 2016
Near space hypersonic vehicles have features of strong coupling, nonlinearity and acute changes in aerodynamic parameters, which are challenging for the controller design. Active disturbance rejection control (ADRC) method does not depend on the accurate
Gao, Ke, Song, Jia, Wang, Lun, Yang, Erfu   +3 more
core   +1 more source

Key Technical Fields and Future Outlooks of Space Manipulators: A Survey

SmartBot, EarlyView.
This paper systematically reviews the technological development of space manipulators, emphasizing the unique challenges posed by space environments. It examines four areas: structural design, modeling, planning, and control, while introducing typical ground test platforms.
Gang Chen, Zeyuan Huang, Ying Yan, Xiaokang An, Zhikai Zhao, Jirong Lin, Xiangrong Zhao, Xianyuan Gao, Junyi Zong, Xuewen Jia, Zhipeng Yao, Jianliang Liao, Ning Ji   +12 more
wiley   +1 more source

The State of Poverty and Food Insecurity in Maseru, Lesotho [PDF]

, 2015
This report on food insecurity in urban Lesotho is the latest in a series on Southern African cities issued by AFSUN. Like the previous reports, it focuses on one city (Maseru) and on poor neighbourhoods and households in that city. More than 60% of poor
Crush, Jonathan, Frayne, Bruce, Leduka, Resetselemang, Letsie, Moipone, Makoa, Ts’episo, Matobo, Thope, McCordic, Cameron, Mphale, Matseliso, Phaila, Mmantai   +8 more
core   +5 more sources

Three-vector model predictive power control of doubly fed induction generator based on linear extended state observer under unbalanced grid

International Journal of Electrical Power & Energy Systems
Doubly-fed induction generator (DFIG) is susceptible to unbalanced grid voltage and mismatched motor parameters during grid-connected operation. The conventional model predictive control (MPC) has low complexity and fast dynamic response, which is widely
Hui Jin, Zhenxiong Zhou, Pingping Qu
doaj   +1 more source

Spaceflight and sport science: Physiological monitoring and countermeasures for the astronaut–athlete on Mars exploration missions

Experimental Physiology, EarlyView.
Abstract Long‐duration spaceflight impacts essentially every system in the human body, resulting in multisystem deconditioning that might impair the health and performance of crewmembers, particularly on long‐duration exploration missions to Mars. In this review, we apply the sport science model of athlete monitoring, testing and training to astronauts;
Luke DeVirgiliis, Nicholas J. Goode, Kurt W. McDowell, Kirk L. English, Robert Novo, Virina Botros, Ginika Agwu, Jessica M. Scott, Lori L. Ploutz‐Snyder   +8 more
wiley   +1 more source

Linear Active Disturbance Rejection Control for DC Bus Voltage of Permanent Magnet Synchronous Generator Based on Total Disturbance Differential

Energies, 2019
The wind power grid-connected inverter system has nonlinear, strong coupling, and is susceptible to grid voltage fluctuations and nonlinear load effects.
Xuesong Zhou, Mao Liu, Youjie Ma, Bao Yang, Faqing Zhao   +4 more
doaj   +1 more source

Linear Active Disturbance Rejection Control for DC Bus Voltage Under Low-Voltage Ride-Through at the Grid-Side of Energy Storage System

Energies, 2020
The energy storage inverter system has the characteristics of nonlinearity, strong coupling, variable parameters, and flexible mode switching between parallel and off grid.
Youjie Ma, Luyong Yang, Xuesong Zhou, Xia Yang, Yongliang Zhou, Bo Zhang   +5 more
doaj   +1 more source

New Double Closed Loop Linear Active Disturbance Rejection Control of Energy Storage Grid-Connected Inverter Based on Lead-Lag Correction Link

IEEE Access, 2020
The energy storage grid-connected inverter system is a complex system with strong nonlinearity and strong coupling, which quality and efficiency of grid-connection are affected by factors such as grid voltage fluctuations and model uncertainty.
Youjie Ma, Luyong Yang, Xuesong Zhou, Xia Yang   +3 more
doaj   +1 more source

Geometric Active Disturbance Rejection Control for Autonomous Rotorcraft in Complex Atmospheric Environment [PDF]

, 2023
This dissertation presents several novel robust tracking control schemes of rotorcraft unmanned aerial vehicles under realistic atmospheric turbulence. To achieve fast converging and stable performance of the rotorcraft control scheme, a new H\ {o ...
Wang, Ningshan
core  

Century‐long trends in plant diversity of temperate mountain vegetation are modulated along elevation gradient

Journal of Ecology, Volume 114, Issue 3, March 2026.
Resurvey studies in mountain forests of the Tatra Mountains (Central Europe) show that plant diversity has increased over the past century, particularly at lower elevations. These shifts were associated more with increased nitrogen deposition and reduced grazing pressure than with direct climate warming.
Kacper Foremnik, Radim Hédl, Antoni Zięba, Jerzy Szwagrzyk, Bartłomiej Surmacz, Remigiusz Pielech   +5 more
wiley   +1 more source