Results 111 to 120 of about 51,014 (299)
Interactional aerodynamics and acoustics of a propeller-augmented compound coaxial helicopter
, 2008 The aerodynamic and acoustic characteristics of a generic hingeless coaxial helicopter with a tail-mounted propulsor and stabiliser have been simulated using Brown's Vorticity Transport Model.
Kim, Hyo Wan +3 more
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Analytical modeling of rotor-structure coupling using modal decomposition for the structure and the blades. [PDF]
, 2014 This paper presents a linear semi-analytical model that is able to predict complex rotor-structure coupling phenomena and their stability. It was primarily designed so as to gain a better physical understanding of this kind of aeroelastic instabilities ...
ROUCOULES, Lionel +3 more
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The British Journal of Sociology, EarlyView.ABSTRACT This piece examines the systematic erosion of academic freedom and the institutionalized censorship and repression of academics in Iran following the Woman, Life, Freedom movement, where universities have been reshaped into extensions of the security state through ideological vetting, pervasive surveillance, and the purging of dissenting ...
Arash Beidollahkhani
wiley +1 more source
MachinesAdvances in distributed electric propulsion and urban air mobility technologies have spurred a surge of research on electric Vertical Take-Off and Landing (eVTOL) aircraft.
Jiahao Zhu +4 more
doaj +1 more source
Seasonal Habitat Selection by a Threatened Ungulate in an Industrializing Boreal Landscape
Animal Conservation, EarlyView.Understanding habitat selection by Threatened wood bison in landscapes characterized by anthropogenic disturbance is important for conservation planning. During summer and winter, bison selected for linear (e.g., roads, seismic lines, pipelines) and polygonal (e.g., well sites) disturbances, unless there were high densities of linear features.
Lisa J. Koetke +4 more
wiley +1 more source
Geometrically Nonlinear Analysis of Composite Beams Based Using a Space–Time Finite Element Method
AerospaceIn this paper, we present a transient-format time-continuous Galerkin finite element method for fully intrinsic geometrically exact beam equations that are energy-consistent.
Xin Hu, Lidao Chen, Yong Liu
doaj +1 more source
[Booklet: B700.1 409 Advanced Attack Helicopter]
, 1956 Booklet: B700.1 409 Advanced Attack ...
Bell Helicopter Textron
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Making Mining Licit: Gold, Commodification, and the Everyday Performance of Law in Colombia
American Anthropologist, EarlyView.ABSTRACT Ethnographies of resource‐making have shown that the extraction of resource value from objects is premised on obviating the emplaced lifeworlds that surrounded objects before they traveled to consumer markets. Much of this literature looks at such supply‐chain disentanglement from the viewpoint of corporate and formal regulatory practices ...
Jesse Jonkman
wiley +1 more source
DronesThe unmanned quad tilt-rotor eVTOL (QTRV) is a variable-configuration aircraft that combines the features of vertical takeoff and landing (VTOL), hovering, and high-speed cruising, making its control system design particularly challenging.
Bohai Deng +3 more
doaj +1 more source
The effect of rotor design on the fluid dynamics of helicopter brownout
, 2009 Helicopters operating close to the ground in dusty environments tend to generate large clouds of dust in the surrounding air. These clouds can obscure the pilot's view of the ground and lead to a dangerous condition known as brownout.
Brown, R.E. +4 more
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