Results 31 to 40 of about 193,131 (370)
Acoustic propulsion of nano- and microcones: dependence on the viscosity of the surrounding fluid [PDF]
Langmuir 38, 10736-10748 (2022), 2022 This article investigates how the acoustic propulsion of cone-shaped colloidal particles that are exposed to a traveling ultrasound wave depends on the viscosity of the fluid surrounding the particles. Using acoustofluidic computer simulations, we found that the propulsion of such nano- and microcones decreases strongly and even changes sign for ...
arxiv +1 more source
Propulsion on a superhydrophobic ratchet [PDF]
Scientific Reports, 2014 Liquids in the Leidenfrost state were shown by Linke to self-propel if placed on ratchets. The vapour flow below the liquid rectified by the asymmetric teeth entrains levitating drops by viscosity. This effect is observed above the Leidenfrost temperature of the substrate, typically 200°C for water.
Dupeux, Guillaume +4 more
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Upper Stage Liquid Propellant Rocket Engine: A Case Analysis [PDF]
Journal of Aerospace Technology and Management, 2021 This paper provides an overview of the design and development process for the L75 liquid propellant rocket engine (LPRE) foreseen as upper stage of a satellite launch vehicle application.
Daniel Soares de Almeida +2 more
doaj +1 more source
Bionic Propulsion on Water and Measurement of Propulsion
Physics Procedia, 2012 AbstractTraditional propulsion fashion on water are propeller propulsion and jet propulsion, but the efficiency relatively low. Used by biological propulsion, after the last million years of evolution, the maximum utilization of its power. Bionic propulsion system designed in this paper consists of two large travel umbrella wing plate in reciprocating ...
Zhao Si-yuan +4 more
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Perspectives, frontiers, and new horizons for plasma-based space electric propulsion
Physics of Plasmas, 2020 There are a number of pressing problems mankind is facing today that could, at least in part, be resolved by space systems. These include capabilities for fast and far-reaching telecommunication, surveying of resources and climate, and sustaining global ...
I. Levchenko +8 more
semanticscholar +1 more source
Genetic algorithm-based multiple moving target reaching using a fleet of sailboats
IET Cyber-systems and Robotics, 2019 This study addresses the problem of Dynamic Travelling Salesman Problem for a multi-agent system using a fleet of sailboats. A genetic algorithm (GA) is proposed, which attributes to each agent a varying number of targets to be collected.
Viel Christophe +4 more
doaj +1 more source
The Kinky Propulsion of Spiroplasma [PDF]
Cell, 2005 Bacteria have evolved many different means of generating movement. In this issue of Cell, Shaevitz et al. (2005) describe the swimming movement of a helical bacterium called Spiroplasma. They discover that Spiroplasma propels itself by generating two temporally distinct kinks that travel the length of the bacterium. These results point to the existence
Charles W. Wolgemuth, Nyles W. Charon
openaire +3 more sources
Maximizing propulsive thrust of a driven filament at low Reynolds number via variable flexibility [PDF]
Soft Matter 13, 2339-2347 (2017), 2016 At low Reynolds numbers the locomotive capability of a body can be dramatically hindered by the absence of inertia. In this work, we show how propulsive performance in this regime can be significantly enhanced by employing spatially varying flexibility.
arxiv +1 more source
Comparison of Active Drag Using the MRT-Method and the MAD-System in Front Crawl Swimming
Proceedings, 2018 The purpose of this study was to compare the active drag values estimated by the MRT-method and the MAD-system. Six male competitive swimmers participated in this study and performed front crawl with arms only condition.
Kenzo Narita +3 more
doaj +1 more source
, 2023 “Surface propulsion”means that the aircraft uses its surface of the shell to propel air. Due to the large surface area of the aircraft shell, aircraft using surface propulsion is equivalent to having a huge jet area. The huge surface area of the outer shell allows the aircraft to use a smaller airflow velocity to drive a large flow of gas, achieving ...
openaire +1 more source