Results 21 to 30 of about 369,913 (319)

Towards a Simplified DynamicWake Model Using POD Analysis

open access: yesEnergies, 2015
We apply a modified proper orthogonal decomposition (POD) to large eddy simulation data of a wind turbine wake in a turbulent atmospheric boundary layer. The turbine is modeled as an actuator disk.
David Bastine   +3 more
doaj   +1 more source

Numerical investigation of wind turbine wakes under high thrust coefficient

open access: yesWind Energy, 2022
We study wind turbine wakes of rotors operating at high thrust coefficients (CT > 24/25) using large‐eddy simulations with a rotating actuator disk model. Wind turbine wakes at high thrust coefficients are different from wakes at low thrust coefficients.
Luis A Martínez‐Tossas   +6 more
doaj   +1 more source

Disease and degeneration of aging neural systems that integrate sleep drive and circadian oscillations

open access: yesFrontiers in Neurology, 2011
Sleep and circadian activity rhythms become irregular with age which are characterized by fragmented sleep during the night and increased daytime sleepiness.
Kris eSingletary, Nirinjini eNaidoo
doaj   +1 more source

Fluidic force and wake velocity of 3D body with four limbs in uniform flow

open access: yesJournal of Fluid Science and Technology, 2023
Robots that operate at a disaster site have been proposed and the dispatch of rescue robots to such site is required. However, discussion on the transport of these robots is insufficient.
Shunsuke YAMADA, Teppei TSUJITA
doaj   +1 more source

Characteristics of unsteady flow around a vehicle affecting its high-speed stability during a dynamic steering action

open access: yesNihon Kikai Gakkai ronbunshu, 2014
In order to clarify unsteady flow structure’s behavior that improves vehicle’s high-speed stability during steering input, on-road analysis was conducted.
Yoshihiro OKADA   +3 more
doaj   +1 more source

Wake flow visualization of a dandelion pappus with posture change

open access: yesJournal of Fluid Science and Technology, 2023
A typical plant that is distributed by wind is the dandelion, which possesses a complex hairy pappus that aids in flying. A pappus or group of bristly filaments found in plumed seeds is believed to have a role in drag enhancement. The pappus prolongs the
Yuki SHIGENAGA, Hiroaki HASEGAWA
doaj   +1 more source

Formation Flight of Fixed-Wing UAVs: Dynamic Modeling, Guidance Design, and Testing in Realistic Scenarios

open access: yesAerospace
Autonomous unmanned flight based on fixed-wing aircraft constitutes a practical and economical solution for transport missions to remote destinations or disadvantaged communities, for which their payload and range represent interesting figures of merit ...
Carlo E.D. Riboldi, Marco Tomasoni
doaj   +1 more source

Sleep EEG Derived From Behind-the-Ear Electrodes (cEEGrid) Compared to Standard Polysomnography: A Proof of Concept Study

open access: yesFrontiers in Human Neuroscience, 2018
Electroencephalography (EEG) recordings represent a vital component of the assessment of sleep physiology, but the methodology presently used is costly, intrusive to participants, and laborious in application.
Annette Sterr   +13 more
doaj   +1 more source

Analysis of Flow Structures and Global Parameters across a Heated Square Cylinder in Forced and Mixed Convection

open access: yesAtmosphere, 2022
In the present study, numerical simulations are performed to identify the role of Reynolds number (Re), Richardson number (Ri) and free-stream orientations (α) on flow structures, aerodynamic parameters and heat transfer characteristics for the ...
Rashid Ali, Nadeem Hasan
doaj   +1 more source

Orexin and MCH neurons: regulators of sleep and metabolism

open access: yesFrontiers in Neuroscience, 2023
Sleep-wake and fasting-feeding are tightly coupled behavioral states that require coordination between several brain regions. The mammalian lateral hypothalamus (LH) is a functionally and anatomically complex brain region harboring heterogeneous cell ...
Hanan Bouâouda, Pawan Kumar Jha
doaj   +1 more source

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