Results 101 to 110 of about 189,925 (269)

Research on Characteristics of Helicopter Engine Bleed Airflow Limitation and Temperature Drop

Nanjing Hangkong Hangtian Daxue Xuebao
The helicopter’s environmental control system is restricted from drawing more than its engine’s maximum allowed bleed air volume to avoid excessive power loss.
LUO Pinggen, ZENG Mancheng, CHEN Zheng, XIA Wenqing   +3 more
doaj   +1 more source

Monitoring wildlife using long‐endurance solar‐electric UAVs

Wildlife Biology, EarlyView.
This report discusses the effectiveness of using small solar‐electric UAV (uncrewed aerial vehicles) for aerial wildlife monitoring. We review four years of aerial wildlife monitoring missions using a 5.5‐m wingspan, solar‐electric UAV that was equipped with a gimballed IR/RGB camera.
Götz Bramesfeld, William Bissonnette, Maya Rahaman‐Noronha, Kanwar Johal   +3 more
wiley   +1 more source

Micro‐habitat selection by boreal woodland caribou improves access to food

Wildlife Biology, EarlyView.
Bio‐logging sensors attached to radiotelemetry receivers have great potential to transform our understanding of the ecological, physiological, and energetic constraints that shape patterns of wildlife movement under field conditions. We used video camera collars to assess microhabitat selectivity by woodland caribou Rangifer tarandus in boreal forests ...
Ian D. Thompson, Philip A. Wiebe, Arthur R. Rodgers, Douglas Reid, James A. Baker, Brent R. Patterson, Eric McNeill, Romain Dejeante, John M. Fryxell   +8 more
wiley   +1 more source

Fast Aerodynamic Prediction of Airfoil with Trailing Edge Flap Based on Multi-Task Deep Learning

Aerospace
Conventional methods for solving Navier–Stokes (NS) equations to analyze flow fields and aerodynamic forces of airfoils with trailing edge flaps (TEFs) are known for their significant time cost.
Chi Zhang, Zhiyuan Hu, Yongjie Shi, Guohua Xu   +3 more
doaj   +1 more source

Finite difference time domain grid generation from AMC helicopter models [PDF]

A simple technique is presented which forms a cubic grid model of a helicopter from an Aircraft Modeling Code (AMC) input file. The AMC input file defines the helicopter fuselage as a series of polygonal cross sections. The cubic grid model is used as an
Cravey, Robin L.
core   +1 more source

Parturition timing and the pre‐ and post‐partum behaviour of female moose assessed using animal‐borne video and movement‐based approaches

Wildlife Biology, EarlyView.
Limited information on moose calving behaviour, including parturition timing, cow‐calf interactions, and pre‐ and post‐partum movement patterns hinder our ability to define calving phenology and habitat use. GPS‐collars were deployed on 89 female moose over five years, including eight collars equipped with animal‐borne video and environmental data ...
Mikaela Borgeaud LeBlanc, Manuelle Landry‐Cuerrier, Vincent Brodeur, Murray M. Humphries   +3 more
wiley   +1 more source

Sand Ingestion Behavior of Helicopter Engines During Hover in Ground Effect

Aerospace
Sand ingestion exerts significant effects on the performance of helicopter engines, and it is imperative to investigate this phenomenon. In this study, the mechanisms of engine sand ingestion during helicopter hover in ground effect are analyzed. Firstly,
Qiang Li, Linghua Dong, Changxin Song, Weidong Yang   +3 more
doaj   +1 more source

Spatiotemporal mapping the usable space of free‐roaming equids across the western United States

Wildlife Society Bulletin, EarlyView.
Identification of the inter‐decadal (2010‐2011) enhancement‐degradation gradients in the usable space for wild equid Herd Management Areas in the Great Basin, USA. Abstract Management of feral equids in the American West is hindered by the lack of a formal habitat map and monitoring system.
Alexander Hernandez, Eric Thacker, Kaden Patten, David Stoner   +3 more
wiley   +1 more source

Results of the noise measurement program on a standard and modified OH-6A helicopter [PDF]

A field noise measurement program has been conducted on a standard OH-6A helicopter and one that had been modified by reducing the rotor speed, altering rotor tip shape, and treating the engine exhaust and inlet to reduce the external noise levels.
Henderson, H. R., Hilton, D. A., Peegg, R. J.   +2 more
core   +1 more source

First Vasectomy Procedure Successfully Performed on a Southern African Male Giraffe (Giraffa camelopardalis giraffa)

Zoo Biology, EarlyView.
First successful vasectomy in a southern African male giraffe, Giraffa camelopardis giraffa ABSTRACT This study reports the first successful vasectomy on a southern African male giraffe (Giraffa camelopardalis giraffa). The goal of the procedure was to create a teaser male for reproductive studies.
Francois Deacon, Willem Daffue, Edward Collin Albertyn, Susanna Maria Krüger, Ayanda Maqhashu, Jacquiline Goedhals, Andri Grobbelaar, Marike Badenhorst   +7 more
wiley   +1 more source