Fan Stage Design and Performance Optimization for Low Specific Thrust Turbofans
International Journal of Turbomachinery, Propulsion and Power, 2023 In modern turbofan engines, the bypass section of the fan stage alone provides the majority of the total thrust required in cruise, and the size of the fan has a considerable effect on the overall engine weight and nacelle drag.
Oliver Sjögren +3 more
doaj +1 more source
Swimming Efficiency of Bacterium Escherichia Coli [PDF]
, 2005 We use in vivo measurements of swimming bacteria in an optical trap to determine fundamental properties of bacterial propulsion. In particular, we determine the propulsion matrix, which relates the angular velocity of the flagellum to the torques and forces propelling the bacterium.
arxiv +1 more source
Validation of a propulsion model in front crawl swimming [PDF]
arXiv, 2023 A propulsion model has been proposed for front crawl swimming (Carmigniani et al., 2020). The aim of this study is to validate this model through a progressive speed test using instrumented paddles to estimate the propulsion forces in swimming.
arxiv
Emergence of collective propulsion through cell-cell adhesion [PDF]
Phys. Rev. E 97, 042413 (2018), 2017 The mechanisms driving the collective movement of cells remain poorly understood. To contribute toward resolving this mystery, a model was formulated to theoretically explore the possible functions of polarized cell-cell adhesion in collective cell migration. The model consists of an amoeba cell with polarized cell-cell adhesion, which is controlled by
arxiv +1 more source
Joint Optimization of Trajectory, Propulsion, and Thrust Powers for Covert UAV-on-UAV Video Tracking and Surveillance [PDF]
IEEE Transactions on Information Forensics and Security, 2020 Autonomous tracking of suspicious unmanned aerial vehicles (UAVs) by legitimate monitoring UAVs (or monitors) can be crucial to public safety and security.
Shuyan Hu +4 more
semanticscholar +1 more source
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
Sea Turtles Employ Drag-Reducing Techniques to Conserve Energy
Journal of Marine Science and Engineering, 2022 Sea turtles are recognised as one of the ocean’s most remarkable migratory species, accomplishing journeys that cover thousands of kilometres. This fact is even more extraordinary when considering sea turtles consume mostly low-energy foods.
Nick van der Geest +3 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
Advances in Engine Efficiency: Nanomaterials, Surface Engineering, and Quantum-Based Propulsion
MagnetochemistryThis study explores ground-breaking methods for improving engine efficiency by combining cutting-edge materials, theoretical frameworks, and alternative energy paradigms.
Mario J. Pinheiro
doaj +1 more source
Toward Smart Footwear to Track Frailty Phenotypes—Using Propulsion Performance to Determine Frailty
Sensors, 2018 Frailty assessment is dependent on the availability of trained personnel and it is currently limited to clinic and supervised setting. The growing aging population has made it necessary to find phenotypes of frailty that can be measured in an ...
Hadi Rahemi +3 more
doaj +1 more source