Results 61 to 70 of about 3,315 (185)

Big Bird: A global dataset of birds in drone imagery annotated to species level

Remote Sensing in Ecology and Conservation, EarlyView.
Drones are a valuable tool for surveying birds, but manually detecting and identifying birds in drone images is costly. We assembled a diverse dataset of 23 865 images of birds captured with 21 different drones across 11 countries. We labelled 4824 of these images, detailing the location, species, posture category, age category, and sex of 49 990 birds
Joshua P. Wilson, Tatsuya Amano, Thomas Bregnballe, Alejandro Corregidor‐Castro, Roxane Francis, Diego Gallego‐García, Jarrod C. Hodgson, Landon R. Jones, César R. Luque‐Fernández, Dominik Marchowski, John McEvoy, Ann E. McKellar, W. Chris Oosthuizen, Christian Pfeifer, Martin Renner, José Hernán Sarasola, Mateo Sokač, Roberto Valle, Adam Zbyryt, Richard A. Fuller   +19 more
wiley   +1 more source

Quantifying Migratory Bat Movements in Central Europe Across Seasons and Years Using a Vertical‐Looking Radar

Remote Sensing in Ecology and Conservation, EarlyView.
Vertical‐looking radar provides a first multi‐year analysis of migratory bat phenology in Europe. Bat activity was lowest in winter, increased from spring, and peaked in summer, with similar timing of pre‐ and post‐maternity migrations across years.
Silvia Giuntini, Janine Aschwanden, Damiano G. Preatoni, Fabian Hertner, Birgen Haest, Baptiste Schmid   +5 more
wiley   +1 more source

Bionic flapping wing structural parameter optimization based on lift maximization

Aviation
To address the issues of short endurance and poor flight performance of flapping wing aircraft, this study focuses on the double-crank double-rocker two-segment flapping wing mechanism and conducts structural parameter optimization research based on ...
Haojun Yang, Jinglin Luo, Xiaoqiang Li, Yuguang Liang, Zelin Hong, Jingjing Zhang, Zhifeng Wang   +6 more
doaj   +1 more source

Bio-Inspired Flexible Flapping Wings with Elastic Deformation

Aerospace, 2017
Over the last decades, there has been great interest in understanding the aerodynamics of flapping flight and development of flapping wing Micro Air Vehicles (FWMAVs).
Tien Van Truong, Quoc-Viet Nguyen, Heow Pueh Lee   +2 more
doaj   +1 more source

Key Technical Fields and Future Outlooks of Space Manipulators: A Survey

SmartBot, EarlyView.
This paper systematically reviews the technological development of space manipulators, emphasizing the unique challenges posed by space environments. It examines four areas: structural design, modeling, planning, and control, while introducing typical ground test platforms.
Gang Chen, Zeyuan Huang, Ying Yan, Xiaokang An, Zhikai Zhao, Jirong Lin, Xiangrong Zhao, Xianyuan Gao, Junyi Zong, Xuewen Jia, Zhipeng Yao, Jianliang Liao, Ning Ji   +12 more
wiley   +1 more source

Design of a bionic flapping wing mechanism based on RSSR mechanism and analysis of aerodynamic characteristics

Journal of Engineering and Applied Science
Flapping-wing aircraft have broad application prospects in scientific research and engineering. Based on the spatial offset RSSR mechanism, this paper designs a bionic flapping-wing structure.
Wen-Juan Deng, Yi-Fan Yang, Chen-Xu Mei, Zi-Heng Guo, Yan He   +4 more
doaj   +1 more source

Can Scalable Design of Wings for Flapping Wing Micro Air Vehicle Be Inspired by Natural Flyers?

International Journal of Aerospace Engineering, 2018
Lift production is constantly a great challenge for flapping wing micro air vehicles (MAVs). Designing a workable wing, therefore, plays an essential role. Dimensional analysis is an effective and valuable tool in studying the biomechanics of flyers.
Yanghai Nan, Bei Peng, Yi Chen, Zhenyu Feng, Don McGlinchey   +4 more
doaj   +1 more source

A Preliminary Exploratory Measurement Model for Systems Thinking in Defence and Aerospace Engineering: A Bifurcated Framework Developed via Multiple Correspondence Analysis

Systems Research and Behavioral Science, EarlyView.
ABSTRACT Modern engineering faces a ‘complexity crisis’ characterized by interlinked, multidisciplinary ‘wicked problems’, particularly within the defence and aerospace sectors. Although systems thinking is recognized as a critical competency for navigating this environment, empirical quantitative frameworks for its measurement remain limited.
Shimon Fridkin, Sigal Kordova
wiley   +1 more source

Saving Bambi from the mower? Using a drone with thermal camera to evaluate a low‐tech scaring technique to reduce roe deer fawn mortality during grass harvest

Wildlife Biology, EarlyView.
Roe deer is a species that hides their neonates as an anti‐predator strategy. This may prove efficient against mammalian predators, such as the red fox; however, it might be an ecological trap as large numbers of fawns are killed by tractors with harvesters each year during grass harvest.
Thomas Vogler, Neri H Thorsen, Simen Pedersen   +2 more
wiley   +1 more source

The effect of passive deformation of dragonfly wing on aerodynamic characteristics

Nihon Kikai Gakkai ronbunshu, 2016
Dragonflies can perform both of gliding and flapping flight and have high maneuverability in spite of small-size. The aim of this study is to develop Micro Air Vehicle (MAV) based on the flight of dragonfly.
Hisayoshi NAKA, Hiromu HASHIMOTO
doaj   +1 more source