Results 151 to 160 of about 177,434 (388)

Amphibious Generator via Mechanical Coupling for Versatile Energy Harvesting

open access: yesAdvanced Energy and Sustainability Research, EarlyView.
An amphibious hybrid triboelectric nanogenerator–electromagnetic generator (TENG–EMG) efficiently harvests energy from wind and water. By integrating TENG and EMG units with a gear‐assisted mechanism, it enhances power output and powers small electronic devices.
Chi Zhang   +7 more
wiley   +1 more source

A Study on the Two-Dimensional Numerical Simulation of Wing Flutter in a Heavy Gas

open access: yesAerospace
Using heavy gases in wind tunnel tests can reduce model weight issues, which have intensified with advancements in high-performance aircraft technology. This study employs time-domain analysis to examine the flutter characteristics and correction methods
Zhe Hu, Shun He, Bo Lu, Jun Zha
doaj   +1 more source

Experimental and analytical transonic flutter characteristics of a geared-elevator configuration [PDF]

open access: yes
The flutter model represented the aft fuselage and empennage of a proposed supersonic transport airplane and had an all movable horizontal tail with a geared elevator. It was tested mounted from a sting in the transonic dynamics tunnel. Symmetric flutter
Doggett, R. V., Jr.   +2 more
core   +1 more source

Impacts of geopolitics and policy on Latin American biodiversity and water resources

open access: yesAgribusiness, EarlyView.
Abstract Latin America is a major agricultural producer with important natural resources. Efforts have been made to protect sensitive areas but are hindered by agricultural trade disruptions outside the control of individual countries due to globally integrated crop markets.
Jerome Dumortier   +2 more
wiley   +1 more source

Application of a flight test and data analysis technique to flutter of a drone aircraft [PDF]

open access: yes
Modal identification results presented were obtained from recent flight flutter tests of a drone vehicle with a research wing (DAST ARW-1 for Drones for Aerodynamic and Structural Testing, Aeroelastic Research Wing-1).
Bennett, R. M.
core   +1 more source

Import Wheat Tenders and the Effects of the Russian Invasion

open access: yesAgribusiness, EarlyView.
ABSTRACT Risk and volatility for many commodities escalated sharply following the Russian invasion of Ukraine, creating numerous uncertainties for trading firms and importers. The purpose of this study is to analyze the bidding behavior in Egyptian wheat import tenders in the pre‐ and post‐invasion periods.
William W. Wilson   +2 more
wiley   +1 more source

Preliminary study of effects of winglets on wing flutter [PDF]

open access: yes
Some experimental flutter results are presented over a Mach number range from about 0.70 to 0.95 for a simple, swept, tapered, flat-plate wing model having a planform representative of subsonic transport airplanes and for the same wing model equipped ...
Doggett, R. V., Jr., Farmer, M. G.
core   +1 more source

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