Results 41 to 50 of about 195,565 (345)
A new propulsion concept for high propulsive hydrodynamic efficiency
Ocean Engineering, 2022 A novel marine propulsor concept is presented for high hydrodynamic efficiency. Optimum performance is sought by thrust-producing counter-flapping foils cyclically oscillating along a closed trajectory. The thrusting device exhibits low propulsion loading and low viscous losses.
Martio, Jussi +3 more
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The Role of the Double-Layer Potential in Regularised Stokeslet Models of Self-Propulsion
Fluids, 2021 The method of regularised stokeslets is widely used to model microscale biological propulsion. The method is usually implemented with only the single-layer potential, the double-layer potential being neglected, despite this formulation often not being ...
David J. Smith +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 ...
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Dual-UAV Enabled Secure Data Collection With Propulsion Limitation
IEEE Transactions on Wireless Communications, 2021 Unmanned aerial vehicles (UAVs) have been widely utilized to improve the end-to-end performance of wireless communications. However, its line-of-sight makes UAV communication vulnerable to malicious eavesdroppers.
Ran Zhang +5 more
semanticscholar +1 more source
Propulsive Capability of an Asymmetric GDM Propulsion System [PDF]
42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2006 *† The role of the ambipolar potential in the propulsive capability of the Gasdynamic Mirror (GDM) has been studied previously. The electrostatic potential arises as a result of the initial rapid escape of the electrons due to their small mass, leaving behind an excess of ions and creating a positive electric potential that slows down the electron ...
Kammash, Terry B., Tang, Ricky
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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
Frontiers in Neurorobotics, 2021 Background: Soft robotic exosuits can facilitate immediate increases in short- and long-distance walking speeds in people with post-stroke hemiparesis.
Franchino Porciuncula +11 more
doaj +1 more source
Journal of Experimental Biology, 2006 In this JEB Classics paper, Sir James Gray and G. J. Hancock explained how spermatozoa are propelled by flagellar bending waves (Gray and Hancock, 1955). This paper was a lasting success because it provided an easy-to-understand solution to a complicated hydrodynamic problem, and because it provided a quantitative prediction of the swimming speed that ...
openaire +5 more sources
Deployment of Solar Sails by Joule Effect: Thermal Analysis and Experimental Results
Aerospace, 2020 Space vehicles may be propelled by solar sails exploiting the radiation pressure coming from the sun and applied on their surfaces. This work deals with the adoption of Nickel-Titanium Shape Memory Alloy (SMA) elements in the sail deployment mechanism ...
Gianluigi Bovesecchi +4 more
doaj +1 more source
Stage reduced counter-rotating axial compressor for jet engine
International Journal for Simulation and Multidisciplinary Design Optimization, 2021 Variation in the states of system, mass flow and pressure are some of the disturbances which are experienced by the compressors in the jet engine under working condition.
Ferdaus F. +3 more
doaj +1 more source