Results 101 to 110 of about 31,802 (273)

Experimental Factors and Techniques for Pool Boiling Heat Transfer Enhancement: A Critical Review

Heat Transfer, EarlyView.
ABSTRACT This review presents a comprehensive assessment of active strategies for enhancing pool boiling heat transfer, with a focus on techniques that do not rely solely on the boiling surface modification. It examines a broad range of methodologies including fluid additives, external fields, mechanical interventions, and thermal‐geometric tuning that
José E. Pereira, R. R. Souza, A. S. Moita   +2 more
wiley   +1 more source

Bifurcations in unsteady aerodynamics [PDF]

Nonlinear algebraic functional expansions are used to create a form for the unsteady aerodynamic response that is consistent with solutions of the time dependent Navier-Stokes equations.
Tobak, M., Unal, A.
core   +1 more source

Aerodynamic Response of a Hovering Rotor to Ramp Changes in Pitch Input [PDF]

, 2008
Under transient conditions, a helicopter rotor generates a complex, time-dependent pattern of shed and trailed vorticity in its wake that has profound eects on its loading.
Brown, R.E., Duraisamy, K.
core   +1 more source

Predictive Control for Alleviation of Gust Loads on Very Flexible Aircraft

, 2014
In this work the dynamics of very flexible aircraft are described by a set of non-linear, multi-disciplinary equations of motion. Primary structural components are represented by a geometrically-exact composite beam model which captures the large dynamic
Chen P., Goland M., Goland M., Géradin M., Géradin M., Maciejowski J. M., Rawlings J. B., Simpson R. J. S., Stevens B. L.   +8 more
core   +1 more source

Raman Signature of the Wings of the Globe Skimmer Dragonfly: Pantala flavescens

Journal of Raman Spectroscopy, EarlyView.
Raman spectroscopy is used to confirm the presence of aliphatic and aromatic hydrocarbons and related derivatives including aldehydes, halides, alcohols, acids, esters, and phenols on the wings of Pantala flavescens. The analysis indicates that wing‐surface lipid composition is largely consistent across the three main ecological zones in Ghana. Notably,
Rachel Desulme, Eva Gates, Myah Massiah, Malek Stafford, Lou Bellinghausen, Lillian Blanchard, Henry Adamson, Evajoice Otoo, Thomas D. Dovie, Abdul A. R. M. Rashid, Ebenezer Boakye, Calvin A. Asiedu, Princess W. Coffie, Hilda Armonle, Abigail Mensah, Kofi W. Adu, Jessica L. Ware, Lara D. LaDage, Rofela Combey, Ekaterina S. Kiseeva   +19 more
wiley   +1 more source

Forces on Obstacles in Rotor Wake – A GARTEUR Action Group [PDF]

, 2017
The paper describes the objectives and the structure of the GARTEUR Action Group HC/AG-22 project which deals with the basic research about the forces acting on obstacles when immersed in rotor wakes.
Bakker, Richard, Barakos, George, Boisard, Ronan, Chirico, Giulia, De Gregorio, Fabrizio, Gallas, Quentin, Gibertini, Giuseppe, Giuni, Michea, Green, Richard, Schmid, Matthias, Schwarz, Thorsten, Visingardi, Antonio, Voutsinas, Spyros, Zagaglia, Daniele   +13 more
core   +1 more source

Vestibular Dysfunction in Parkinson's Disease: A Systematic Review of Signs and Symptoms

Movement Disorders Clinical Practice, EarlyView.
Abstract Background Despite the growing interest in the link between Parkinson's disease (PD) neuropathology and vestibular system, there is still a lack of consensus about the presence of vestibular dysfunctions in PD. Objective This review aims to identify vestibular signs and symptoms reported in PD patients and to summarize and critically appraise ...
Francisco Rosado‐Martins, Beatriz Santos, Cláudia M. Costa, Tiago Eça, Raquel Bouça‐Machado, Joaquim J. Ferreira   +5 more
wiley   +1 more source

Study on Water Entry of a 3D Torpedo Based on the Improved Smoothed Particle Hydrodynamics Method

Applied Sciences
The water entry of a torpedo is a complex nonlinear problem, involving transient impact, free surface deformation, droplet splashing, and fluid–structure coupling, which poses severe challenges to traditional mesh methods.
Xiaowei Cai, Wei Wu, Wenji Han, Wenjie Li, Jun Zhang, Yanmei Jiao   +5 more
doaj   +1 more source

Performance analysis of flexible aircraft with active control [PDF]

Small perturbation equations of motion of a flexible aircraft with an active control technology (ACT) system were developed to evaluate the stability and performance of the controlled aircraft.
Morino, L., Noll, R. B.
core   +1 more source

Subsonic flutter analysis addition to NASTRAN [PDF]

, 1973
A subsonic flutter analysis capability has been developed for NASTRAN, and a developmental version of the program has been installed on the CDC 6000 series digital computers at the Langley Research Center.
Doggett, R. V., Jr., Harder, R. L.
core   +1 more source