Results 1 to 10 of about 440,820 (310)
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
Brokaw, Charles J.
core +7 more sources
Electric Propulsion Methods for Small Satellites: A Review
Aerospace, 2021 Over 2500 active satellites are in orbit as of October 2020, with an increase of ~1000 smallsats in the past two years. Since 2012, over 1700 smallsats have been launched into orbit. It is projected that by 2025, there will be 1000 smallsats launched per
Dillon O’Reilly +2 more
doaj +2 more sources
Efficiency of Fish Propulsion [PDF]
Bioinspiration & Biomimetics, 2014 It is shown that the system efficiency of a self-propelled flexible body is ill-defined unless one considers the concept of quasi-propulsive efficiency, defined as the ratio of the power needed to tow a body in rigid-straight condition over the power it needs for self-propulsion, both measured for the same speed. Through examples we show that the quasi-
Maertens, Audrey +2 more
arxiv +8 more sources
Self-Propulsion of Chemically Active Droplets [PDF]
Annual Review of Fluid Mechanics, 2022 Microscopic active droplets are able to swim autonomously in viscous flows. This puzzling feature stems from solute exchanges with the surrounding fluid via surface reactions or their spontaneous solubilization and from the interfacial flows resulting ...
S. Michelin
semanticscholar +1 more source
Battery Energy Storage Systems in Ships’ Hybrid/Electric Propulsion Systems
Energies, 2023 The shipping industry is going through a period of technology transition that aims to increase the use of carbon-neutral fuels. There is a significant trend of vessels being ordered with alternative fuel propulsion.
M. Kolodziejski, I. Michalska-Pożoga
semanticscholar +1 more source
Identifying Effective Drivers in the Future of Sports Businesses in Khorasan Razavi Province [PDF]
Journal of New Studies in Sport Management, 2022 The purpose of this study was to identify effective drivers in the future of sports businesses in Khorasan Razavi province. The participants included experts in management, marketing and sports businesses. The interviews were conducted by snowball method
Mohammad Ali Sahebkaran +2 more
doaj +1 more source
Analysis of Effective Drivers in Pattern Framework of Spatial-Policy Making [PDF]
جغرافیا و آمایش شهری منطقهای, 2021 Architectural rupture and instability is a pattern of land management with disabilities and theoretical and operational shortcomings that the foundation of this kind of integrated and coordinating approach is always shaken with intensity and weakness ...
Hedayat Darvishi +3 more
doaj +1 more source
High shear rate propulsion of acoustic microrobots in complex biological fluids
Science Advances, 2022 Untethered microrobots offer a great promise for localized targeted therapy in hard-to-access spaces in our body. Despite recent advancements, most microrobot propulsion capabilities have been limited to homogenous Newtonian fluids.
Amirreza Aghakhani +5 more
semanticscholar +1 more source
Overview of Propulsion Systems for Unmanned Aerial Vehicles
Energies, 2022 Unmanned Aerial Vehicle (UAV) propulsion technology is significantly related to the flight performance of UAVs, which has become one of the most important development directions of aviation.
Bowen Zhang +3 more
semanticscholar +1 more source
Rheological similarities between dense self-propelled and sheared particulate systems [PDF]
Soft Matter 16, 3642 (2020), 2021 Different from previous modelings of self-propelled particles, we develop a method to propel the particles with a constant average velocity instead of a constant force. This constant propulsion velocity (CPV) approach is validated by its agreement with the conventional constant propulsion force (CPF) approach in the flowing regime.
arxiv +1 more source