Results 41 to 50 of about 356,579 (289)

Space and Observers in Cosmology [PDF]

, 2001
I provide a prescription to define space, at a given moment, for an arbitrary observer in an arbitrary (sufficiently regular) curved space-time. This prescription, based on synchronicity (simultaneity) arguments, defines a foliation of space-time, which ...
Lachièze-Rey, M.
core   +2 more sources

Active Edgewise Blade Damping Control of Large Wind Turbines by Using the Pitch Controller and an Interval Observer

Actuators
Large wind turbines have typically poorly damped structures. Hence, the absence of damping leads to aeroelastic oscillations, and the operational rotor speed can approach the critical rotor speed.
Suryans Chamoli, Adrian Gambier
doaj   +1 more source

Efficiency at optimal work from finite reservoirs: a probabilistic perspective [PDF]

, 2014
We revisit the classic thermodynamic problem of maximum work extraction from two arbitrary sized hot and cold reservoirs, modelled as perfect gases. Assuming ignorance about the extent to which the process has advanced, which implies an ignorance about ...
Bar-Shalom Y., Bar-Shalom Y., Blackman S. S., Bogler P. L., Bryson A. E., Salmond D. J.   +5 more
core   +1 more source

Jordan Canonical Form for Solving the Fault Diagnosis and Estimation Problems

Technologies, 2023
The suggested methods for solving fault diagnosis and estimation problems are based on the use of the Jordan canonical form. The diagnostic observer, virtual sensor, interval, and sliding mode observer design problems are considered. Algorithms have been
Oleg Sergiyenko, Alexey Zhirabok, Paolo Mercorelli, Alexander Zuev, Vladimir Filaretov, Vera Tyrsa   +5 more
doaj   +1 more source

A neural network adaptive interval observer design for nonlinear systems

IET Control Theory & Applications, 2022
A design method of neural network adaptive interval observer for the continuous‐time unknown nonlinear system is proposed. The bounds of unknown nonlinear functions are described by the state and the input, so that the bounds of the nonlinear function ...
Zeren Yi, Wei Xie, Longwen Liu, Bugong Xu   +3 more
doaj   +1 more source

A non-linear observer for unsteady three-dimensional flows [PDF]

, 2007
A method is proposed to estimate the velocity field of an unsteady flow using a limited number of flow measurements. The method is based on a non-linear low-dimensional model of the flow and on expanding the velocity field in terms of empirical basis ...
A. Iollo, Abarbanel, Adrian, Bonnet, Buffoni, Camarri, Cohen, Cohen, E. Lombardi, Everson, Ewing, Galletti, Galletti, Hoepffner, Kalman, Le Dimet, Lions, Lumley, M. Buffoni, M.V. Salvetti, Ma, Naguib, S. Camarri, Schmit, Sirovich, Spazzini, Tinney, Venturi, Willcox   +28 more
core   +6 more sources

Distributed Sliding Mode Fault-Tolerant LFC for Multiarea Interconnected Power Systems under Sensor Fault

Complexity, 2022
This paper focuses on the problem of load frequency control and sensor fault-tolerant control in the multiarea power grid. To solve these problems, a sliding mode control strategy based on an interval observer is designed.
Xichao Zhou, Zhenlan Dou, Weiming Zhang, Yiwei Zhang, Deyi Wang, Chunyan Zhang, Dezhi Xu   +6 more
doaj   +1 more source

Acceleration-induced nonlocality: kinetic memory versus dynamic memory [PDF]

, 2001
The characteristics of the memory of accelerated motion in Minkowski spacetime are discussed within the framework of the nonlocal theory of accelerated observers. Two types of memory are distinguished: kinetic and dynamic.
Giglio, Eric, Reinhard, P.-G., Suraud, Eric   +2 more
core   +4 more sources

Inter- and intra-observer reliability of thoracic limb circumference measurement methods in sound dogs

Frontiers in Veterinary Science, 2023
ObjectiveThe primary objectives of this study are to (1) compare the inter- and intra-observer reliability of thoracic limb circumference measurement methods in sound dogs, and (2) determine the most reliable thoracic limb positioning and location on the
Kelly Deabold, Jordan Harriz, Brandy Madeiros, Wendy Davies, Justin Shmalberg, Erin Miscioscia   +5 more
doaj   +1 more source

Clinical Insights Into Hypercalcemia of Malignancy in Childhood

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Hypercalcemia of malignancy (HCM) is a rare but life‐threatening metabolic emergency in children that occurs in less than 1% of pediatric cancer cases, with a reported incidence ranging from 0.4% to 1.0% across different studies. While it is observed in 10%–20% of adult malignancies, pediatric HCM remains relatively uncommon.
Hüseyin Anıl Korkmaz
wiley   +1 more source