Results 41 to 50 of about 350,639 (185)
Solar Sails : Technology and demonstration status [PDF]
, 2012 Solar Sail propulsion has been validated in space (IKAROS, 2012) and soon several more solar-sail propelled spacecraft will be flown. Using sunlight for spacecraft propulsion is not a new idea.
Barnes, Nathan +5 more
core +1 more source
Biology, 2022 Different movement speeds can contribute to different joint loading in sports. Joint contact force is the actual force acting on the articular surface, which could predict performance and injury, but is rarely reported for badminton overhead strokes ...
Xinze Cui +4 more
doaj +1 more source
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
openaire +1 more source
A Portable, Low-Cost Wheelchair Ergometer Design Based on a Mathematical Model of Pediatric Wheelchair Dynamics [PDF]
, 2015 Evaluation and training of wheelchair propulsion improves efficiency and prevents orthopaedic injury in pediatric manual wheelchair users. Ergometers allow static propulsion and emulate typical conditions. Currently available ergometers have deficiencies
Harris, Gerald F. +2 more
core +1 more source
A Two-Phase Mass Flow Rate Model for Nitrous Oxide Based on Void Fraction
Aerospace, 2022 In the field of space propulsion, self pressurized technology is an example of innovation capable of improving system performances through reduction of volumes and other optimizations.
Simone La Luna +4 more
doaj +1 more source
Efficiency of fish propulsion [PDF]
Bioinspiration & Biomimetics, 2015 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
openaire +5 more sources
Fluids, 2020 Turning maneuvers by aquatic animals are essential for fundamental life functions such as finding food or mates while avoiding predation. However, turning requires resolution of a fundamental dilemma based in rotational mechanics: the force powering a ...
John O. Dabiri +5 more
doaj +1 more source
The Development of a Next-Generation Latticed Resistojet Thruster for CubeSats
AerospaceCubeSat and small satellite resistojet heat exchanger designs are based on conventional concepts that have been used since the 1960s, being primarily limited to helical or twisted tape heat exchangers.
Daniel Turner, Robert Howie, Phil Bland
doaj +1 more source
The Effect of Chemical Reactivity on the Formation of Gaseous Oblique Detonation Waves
Aerospace, 2019 High-fidelity numerical simulations using a Graphics Processing Unit (GPU)-based solver are performed to investigate oblique detonations induced by a two-dimensional, semi-infinite wedge using an idealized model with the reactive Euler equations coupled ...
Chian Yan +3 more
doaj +1 more source
Propulsion Drive Models for Full Electric Marine Propulsion Systems [PDF]
2007 IEEE International Electric Machines & Drives Conference, 2007 Integrated full electric propulsion systems are being introduced across both civil and military marine sectors. Standard power system analysis packages cover electrical and electromagnetic components but have limited models of mechanical subsystems and their controllers.
Apsley, JM +9 more
openaire +5 more sources