Results 11 to 20 of about 87,347,625 (209)
Ground effect on a rotor wake. [PDF]
, 1985 The effect of the ground on a rotor wake in forward flight has been investigated experimentally in the working section of an 8ft x Oft straight-through wind tunnel.
Kusmarwanto, I.
core +7 more sources
Measurements of a rotor flow in ground effect and visualization of the brown-out phenomenon [PDF]
, 2008 Quantitative and qualitative results of a series of experiments conducted on a rotor in ground effect at low forward speeds are presented. The velocity over a wide area of the ground effect wake was measured using Particle Image Velocimetry (PIV), and ...
Green, R., Nathan, N.
core +8 more sources
Self-Powered All-in-One Wearable Bioelectronics Driven by Pneumatic Energy Buffering of Daily Footsteps. [PDF]
Adv Sci (Weinh)A pneumatic energy‐buffering strategy transforms transient and intermittent footsteps into quasi‐continuous electrical energy for a self‐powered wearable biosensing platform. The footwear‐integrated air‐pumping harvester, combined with the rationally designed power‐management system, powers a wearable ankle PPG device with reduced motion artifacts ...
Kim JS +8 more
europepmc +2 more sources
The effect of helicopter configuration on the fluid dynamics of brownout [PDF]
, 2008 Brown’s Vorticity Transport Model, coupled to an additional particle transport model, is used to simulate the development of the dust cloud that can form around a helicopter when operating in dusty or desert conditions.
Brown, R.E. +3 more
core +13 more sources
Journal of Harbin University of Science and Technology, 2018 In order to study the generator rotor slot wedge eddy current loss under different conditions . The 1407MVA turbo generator at half speed is researched as an example. Mathematical model is established in 2D electromagnetic field.
GE Bao-jun +5 more
doaj +1 more source
Voltage stability improvement of an Egyptian power grid‐based wind energy system using STATCOM
Wind Energy, 2022 The increase in electricity demand places its focus on renewable energies as sustainable energy resources. Wind energy is one of the most important green energy sources.
Montaser Abdelsattar +6 more
doaj +1 more source
IEEE Access, 2022 The article presents the design and development of invasive weed optimization (IWO) for the sensor less speed control of doubly fed induction generator (DFIG) under balanced and unbalanced conditions. A healthy condition represents the balanced condition
Abhinav Saxena +5 more
doaj +1 more source
Environment-sensitive behavior of fluorescent molecular rotors
Journal of Biological Engineering, 2010 Molecular rotors are a group of fluorescent molecules that form twisted intramolecular charge transfer (TICT) states upon photoexcitation. When intramolecular twisting occurs, the molecular rotor returns to the ground state either by emission of a red ...
Theodorakis Emmanuel A, Haidekker Mark A
doaj +1 more source
Main rotor-tail rotor intraction and its implications for helicopter directional control [PDF]
, 2008 Aerodynamic interference between the main and tail rotor can have a strong negative influence on the flight mechanics of a conventional helicopter. Significant unsteadiness in the tail rotor loading is encountered under certain flight conditions, but the
Fletcher, Timothy M., Brown, R.E.
core +4 more sources
Remote Sensing in Ecology and Conservation, 2023 Wind energy is a major and rapidly expanding renewable energy source. Horizontal‐axis wind turbines, the main tool in this industry, induce mortality in flying animals and consequently bring about conservation concerns and regulatory restrictions.
Yuval Werber +4 more
doaj +1 more source