Results 111 to 120 of about 64,082 (287)

Estimating red deer Cervus elaphus population density using drones in a steep and rugged terrain

Wildlife Biology, EarlyView.
Precise and accurate information about population density, crucial for wildlife management, is difficult to obtain for elusive species living in dense forests or steep and inaccessible terrain. Using unmanned aerial vehicles (UAVs), we developed a method for obtaining absolute population estimates of ungulates living in steep, rugged, and partly ...
Julie Bommerlund, Torbjørn Ergon, Simon Filhol, Atle Mysterud   +3 more
wiley   +1 more source

Experimental study of main rotor tip geometry and tail rotor interactions in hover. Volume 2: Run log and tabulated data [PDF]

A model scale hover test was conducted in the Sikorsky Aircraft Model Rotor hover Facility to identify and quantify the impact of the tail rotor on the demonstrated advantages of advanced geometry tip configurations.
Balch, D. T., Lombardi, J.
core   +1 more source

Experimental assessment of large mammal population estimates from airborne thermal videography

Wildlife Biology, EarlyView.
Wildlife resource management requires reliable, fast, and affordable methods of surveying wildlife populations to develop and adaptively adjust policies. Thermal video from drones can yield high rates of detection over large areas with relative speed and safety.
Julia S. McElhinny, Gregory D. Larsen, Maxwell Messinger, Chad H. Newbolt, Andrew Whitworth, Stephen S. Ditchkoff, Miles R. Silman, Jared T. Beaver   +7 more
wiley   +1 more source

Aerodynamic characteristics of a 1/6-scale powered model of the rotor systems research aircraft [PDF]

A wind-tunnel investigation was conducted to determine the effects of the main-rotor wake on the aerodynamic characteristics of the rotor systems research aircraft (RSRA).
Freeman, C. E., Mineck, R. E.
core   +1 more source

Optimal Scheduling of Data Centre Integrated Energy Systems Considering Electric‐Thermal Demand Response Under Icing Uncertainty

Energy Internet, EarlyView.
ABSTRACT Extreme icing disasters increasingly undermine the reliability of integrated power and heat networks by causing line outages, supply shortages and sharp thermal load fluctuations. To address these challenges, this paper proposes a comprehensive optimisation framework that exploits the spatiotemporal flexibility of data centres for coordinated ...
Yan Wang, Hui Hou, Zhengguo Wang, Wenzhe Zheng, Zhengtian Li, Xiangning Lin, Wu Chen   +6 more
wiley   +1 more source

The radar image formation algorithms for screws of an aerial vehicle in horizontal and vertical planes in the radar sensor with inverse synthesis of antenna aperture

Доклады Белорусского государственного университета информатики и радиоэлектроники, 2019
The radar image formation algorithms for rotating parts of an aerial vehicle in the radar sensor with inverse synthesis of antenna aperture using the monochromatic probing signal are considered.
S. R. Heister, T. T. Nguyen
doaj  

Integrating simultaneous interfacial shear rheology with neutron reflectometry for structural and dynamic analysis of fluid interfacial systems

Journal of Applied Crystallography, EarlyView.
We present a new setup at the FIGARO horizontal neutron reflectometer enabling simultaneous measurement of the structural and mechanical properties of liquid interfaces, combining neutron reflectometry with interfacial shear rheology.The study of the structure and mechanical properties of complex fluid interfaces has attracted growing interest in ...
Pablo Sánchez-Puga, Javier Tajuelo, Javier Carrascosa-Tejedor, Miguel Ángel Rubio, Philipp Gutfreund, Armando Maestro   +5 more
wiley   +1 more source

Control of Helicopter Using Virtual Swashplate

Drones
This article presents a virtual swashplate mechanism for a mini helicopter in classic configuration. The propeller bases are part of a passive mechanism driven by main rotor torque modulaton, this mechanism generates a synchronous and opposite change in ...
Jonathan Flores, Sergio Salazar, Ivan Gonzalez-Hernandez, Yukio Rosales, Rogelio Lozano, Eduardo Salazar, Benjamin Nicolas   +6 more
doaj   +1 more source

Sailing Through Time: Building Pacific Maritime Resilience

Global Policy, EarlyView.
ABSTRACT This article examines the Pacific Blue Shipping Partnership (PBSP), an ambitious initiative aimed at decarbonising maritime transport across Oceania. The study explores the cultural, historical and technological aspects of wind‐propelled shipping in the Pacific.
Christiaan De Beukelaer, John Taukäve, Maria Sahib, Eldine Glees, Aseri Driu, Joshua Lakabung, Atina Schutz, Joseph H. Genz, Shania G. Tamagyongfal, Jerolynn K. Myazoe, Alexander Mawyer, Alson Kelen, Larry Raigetal, Raffael Held, Andrew Irvin, Morgan Wairiu, Peter Nuttall, Transform Aqorau, Kyrie Lalauvaki, Aileen Sefeti, John Kautoke   +20 more
wiley   +1 more source

Experimental studies of radar image construction algorithms for propellers and measurement method for repetition frequencies of the blades

Доклады Белорусского государственного университета информатики и радиоэлектроники, 2019
The radar image construction algorithms for propellers of aerial vehicles belonging to the classes «helicopter» and «propeller-driven aircraft» were proposed in [1].
S. R. Heister, T. T. Nguyen
doaj