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Low-latitude ionospheric disturbance electric field effects during the recovery phase of the 19-21 October 1998 magnetic storm
(American Geophysical Union, 2003-12-23)
Low‐latitude ionospheric electric fields and currents are often strongly disturbed during periods of enhanced geomagnetic activity. These perturbations can last for several hours after geomagnetic quieting. We use incoherent ...
Nonlinear control of a permanent magnet synchronous motor with disturbance torque estimation
(Institute of Electrical and Electronics Engineers, 2000-06)
This paper introduces a sensorless nonlinear control scheme for controlling the speed of a permanent magnet synchronous motor (PMSM) driving an unknown load torque. The states of the motor and disturbance torque are estimated ...
Finite-Set Model Predictive Current Control of Induction Motors by Direct Use of Total Disturbance
(Institute of Electrical and Electronics Engineers Inc., 2021)
Disturbance rejection strategies are very useful for the robustness improvement of the predictive control method. But they can only be used in the modulated-based predictive control methods such as continuous set model ...
Ionosonde observations of ionospheric disturbances due to the 15 February 2013 Chelyabinsk meteor explosion
(American Geophysical Union, 2015-10-29)
We report the results of our investigations on the potential ionospheric effects caused by the 15 February 2013 Chelyabinsk meteor explosion. We used the data from a number of digisonde stations located in Europe and Russia ...
Effects of recreational activities on Patagonian rocky shores
(Elsevier, 2017-08)
Recreational activities can be an important source of anthropogenic disturbance in intertidal benthic assemblages. On rocky shores, activities such as trampling, snorkeling and the handling of organisms may have a negative ...
Editorial article: Disturbance, seeds, restoration, and the importance of experiments and long-term observations: the Editors’ Award for 2005
(Wiley Blackwell Publishing, Inc, 2006-05)
Disturbance ecology has become an integral part of vegetation science over the past 25 years. Understanding human disturbances and human effects on natural disturbance regimes is a key to establishing restoration goals and ...
Controle por modos deslizantes e observador de distúrbios aplicados ao motor síncrono de ímãs permanentes
(Universidade Federal de Santa MariaBREngenharia ElétricaUFSMPrograma de Pós-Graduação em Engenharia Elétrica, 2015-08-20)
This master thesis proposes a current control technique based on sliding mode strategy
and disturbance observer for high-performance drive applied to permanent magnet
synchronous motors and can be extended to other ...
Plasma drifts and polarization electric fields associated with TID‐like disturbances in the low‐latitude ionosphere: C/NOFS observations
(American Geophysical Union, 2016-01-13)
Medium‐scale traveling ionospheric disturbances are often observed at the magnetically conjugate points in the nighttime midlatitude ionosphere. It has been suggested that gravity waves disturb the ionosphere and induce ...
Unknown input observers for uncertain systems: A unifying approach
(LavoisierCachanFrança, 1999)
A Robust Predictive Speed Control for SPMSM Systems Using a Sliding Mode Gradient Descent Disturbance Observer
(2023-03-01)
This paper proposes a sliding mode gradient descent disturbance observer-based adaptive reaching law sliding mode predictive speed control (GD-SMPC+ARL) for surface-mounted permanent magnet synchronous motor (SPMSM) systems ...