Results 121 to 130 of about 64,082 (287)

A flight dynamics investigation of compound helicopter configurations [PDF]

, 2013
Compounding has often been proposed as a method to increase the maximum speed of the helicopter. There are two common types of compounding known as wing and thrust compounding.
Ferguson, K., Thomson, D.
core  

In situ aerial bioacoustic monitoring from extremely noisy drone recordings

Methods in Ecology and Evolution, EarlyView.
Abstract Aerial bioacoustic monitoring has the potential to transform biodiversity surveys by enabling rapid acoustic sampling across large and inaccessible habitats. However, its application from unmanned aerial vehicles (UAVs) has remained limited because strong rotor self‐noise overwhelms target sounds such as bird vocalisations, compromising the ...
Lin Wang, Michael Clayton, Axel G. Rossberg   +2 more
wiley   +1 more source

COMPUTATIONAL MODELING OF AERODYNAMIC INTERFERENCE OF HELICOPTER MAIN AND TAIL ROTORS AT THE SPECIAL FLIGHT REGIMES

Научный вестник МГТУ ГА, 2016
This article is concentrated on modeling and researching of aerodynamic characteristics of main and tail rotors’ combination of a single-rotor helicopter scheme. Non-linear free wake vortical model with diffusion of free wake is used.
Y. M. Ignatkin, P. V. Makeev, A. I. Shomov   +2 more
doaj  

Aeroelastic characteristics of the AH-64 bearingless tail rotor [PDF]

The results of a wind tunnel test program to determine the performance loads and dynamic characteristics of the Composite Flexbeam Tail Rotor (CFTR) for the AH-64 Advanced Attack Helicopter are reported.
Banerjee, D.
core   +1 more source

Microarrayed Allergen Molecules Distinguish IgE Sensitisation to Blomia tropicalis and Dermatophagoides pteronyssinus

Allergy, EarlyView.
This study established a microarray containing a representative panel of purified Blo t and Der p allergens for the identification of patients sensitised to Blo t and/or Der p. Results indicate that the microarray based on Blo t and Der p allergens is a useful tool for the identification of Blo t‐ and/or Der p‐sensitised patients. The microarray may be
Nishelle Dsouza, Siratcha Phanthong, Huey‐Jy Huang, Milena Weber, Eszter Sarzsinszky, Petra Zieglmayer, Gabrielle Pauli, Margarete Focke‐Tejkl, Mikhail Tulaev, Nikolina Todorovic, Walter Keller, Thomas Schlederer, Luis Caraballo, Anchalee Tungtrongchitr, Rudolf Valenta, Pongsakorn Tantilipikorn, Susanne Vrtala   +16 more
wiley   +1 more source

Aerodynamic Effect of Strakes on Two-Dimensional Tail Boom Models of the OH-58A and the OH-58D Helicopters [PDF]

During hover and low speed flight, helicopters experience significant aerodynamic forces on the tail boom caused by the wake from the main and tail rotors and by crosswinds.
Crowell, Cynthia A., Kelley, Henry L.
core   +1 more source

Applying rotorcraft modelling technology to renewable energy research [PDF]

, 2009
The perceived need to reduce mankind's impact on the global climate motivates towards a future society in which a significant proportion of its energy needs will be extracted from the winds and the tides of the planet.
Brown, R.E., Fletcher, Timothy M., Kelly, Mary E., Kim, Hyo Wan, Phillips, Catriona, Scheurich, Frank   +5 more
core  

Differential segment‐specific signalling pathways for guanylate cyclase C‐activated anion secretion in murine ileocolon

British Journal of Pharmacology, EarlyView.
Abstract Background and Purpose Guanylate cyclase‐C (GC‐C) is the receptor for endogenous (uro)guanylin peptides, bacterial toxins and pharmacological analogues. Receptor activation leads to intestinal fluid loss, but also activates an antiproliferative pathway and is a promising target in colorectal cancer therapy.
Renjie Xiu, Johannes Reiner, Franz Hofmann, Azam Salari, Ursula Seidler   +4 more
wiley   +1 more source

Damage and Failure of Aeroengine Blades Under Small UAV Impacts

International Journal of Aerospace Engineering
Unmanned aerial vehicles (UAVs) may collide with vulnerable parts of other aircrafts, such as engine blades, causing accidents. The research on small UAV impact is limited. Besides, UAV impact with propeller and rotor blades is poorly understood. In this
Zhibin Wu, Chi Chen, Feiying Chen, Jun Liu   +3 more
doaj   +1 more source

Rotorcraft research testing in the National Full-Scale Aerodynamics Complex at NASA Ames Research Center [PDF]

The unique capabilities of the National Full-Scale Aerodynamics Complex (NFAC) for testing rotorcraft systems are described. The test facilities include the 40- by 80-Foot Wind Tunnel, the 80- by 120-Foot Wind Tunnel, and the Outdoor Aerodynamic Research
Johnson, W., Smith, C. A., Warmbrodt, W.
core   +1 more source