Results 31 to 40 of about 5,349 (171)

A Unified Approach to Estimating Production Functions: Proxy Variables and Dynamic Panel Data

The Journal of Industrial Economics, EarlyView.
ABSTRACT We propose a new approach to production function estimation that integrates the strengths of the proxy‐variable (PV) and dynamic panel data (DPD) methods. Our framework augments the set of instruments for the level equation in Blundell and Bond [8] with a Berkson‐type instrument motivated by economic theory, following Olley and Pakes [28 ...
Jose Miguel Abito, Konstantinos Metaxoglou   +1 more
wiley   +1 more source

Exciting Objects for Historical Research—Mechanical Gyroscopes in Germany Between 1925 and 1975

Proceedings in Applied Mathematics and Mechanics, Volume 26, Issue 4, December 2026.
ABSTRACT The contribution presents a dissertation project in the history of science and technology that uses gyro instruments as objects of historical research, offering exciting opportunities for investigation using a wide variety of methodological approaches.
Maria Niklaus
wiley   +1 more source

Assessing the Behavioural Responses of Small Cetaceans to Unmanned Aerial Vehicles

Remote Sensing, 2021
Unmanned Aerial Vehicles (UAVs), or drones, have recently emerged as a relatively affordable and accessible method for studying wildlife. Vertical Take-off and Landing (VTOL) UAVs are appropriate for morphometric, behavioural, abundance and demographic ...
Joana Castro, Francisco O. Borges, André Cid, Marina I. Laborde, Rui Rosa, Heidi C. Pearson   +5 more
doaj   +1 more source

Collision‐Resilient Winged Drones Enabled by Tensegrity Structures

Advanced Robotics Research, Volume 2, Issue 5, October 2026.
Based on structures of birds such as the woodpeck, this article presents the collision‐resilient aerial robot, SWIFT. SWIFT leverages tensegrity structures in the fuselage and wings which allow it to undergo large deformations in a crash, without sustaining damage. Experiments show that SWIFT can reduce impact forces by 70% over conventional structures.
Omar Aloui, Raphael Zufferey, William Stewart, Mohammad Askari, Simon Jeger, Dario Floreano   +5 more
wiley   +1 more source

Applicability of Multirotors in Czech Armed Forces

Vojenské rozhledy, 2022
Authors of the paper present results of research in the area of deployment and operation of multirotors, i.e., autonomous aerial systems with vertical take-off and landing (VTOL) capability.
Petr Žárský, Petr Hlavizna, Jakub Hnidka   +2 more
doaj   +1 more source

Unmanned Aerial Systems for Corrosion Detection: Multi‐Sensor Technologies, Challenges, and Opportunities for Next‐Generation Inspection

Quality and Reliability Engineering International, Volume 42, Issue 6, Page 3565-3583, October 2026.
ABSTRACT Corrosion remains a critical threat to the integrity and service life of infrastructure in industries such as oil, gas, construction, renewable energy, and transportation. Traditional inspection methods, being labor‐intensive, hazardous, and often subjective, fall short in addressing modern inspection demands.
Alhossein Alharbi, Yunes Alqudsi, Alhasan Ali Alharbi, Mohammed Basheer Mohiuddin   +3 more
wiley   +1 more source

Respiration Patterns of Southern Right Whale (Eubalaena australis) Mothers and Calves in Southern Brazil

Marine Mammal Science, Volume 42, Issue 4, October 2026.
ABSTRACT Respiration is a key physiological process in cetaceans, closely linked to energy expenditure, behavior, and physiological state. Using drone‐based surveys, we quantified respiration patterns of southern right whale (Eubalaena australis) mother–calf pairs in southern Brazil across two reproductive seasons (2020–2021).
Jéssica Karasek, Daniel Danilewicz, Ticiana Fettermann, Carla Cavassani, Lucas Lima de Oliveira, Yvonnick Le Pendu   +5 more
wiley   +1 more source

Aerodynamic Investigation for a Propeller-Induced Lift-Enhancing Vertical Take-Off and Landing (VTOL) Configuration

Drones
Difficulty in thrust-matching between the cruise and vertical take-off and landing (VTOL) phases is one of the prominent issues faced by conventional VTOL fixed-wing drones.
Hongbo Wang, Guangjia Li, Jie Li, Junjie Zhuang   +3 more
doaj   +1 more source

A hierarchical unmanned aerial system–light detection and ranging–satellite learning framework for scaling heterogeneous vegetation cover mapping in rangelands

Grassland Research, Volume 5, Issue 3, Page 245-269, September 2026.
This study shows how drones, light detection and ranging (LiDAR), and satellites can be combined to map vegetation in rangelands more effectively. Drone imagery captures fine‐scale plant details, LiDAR adds information about vegetation structure and height, and satellite data allow the mapping approach to be expanded across larger areas.
Nishat Shermin, Narcisa G. Pricope, Padmanava Dash, Javier M. Osorio Leyton   +3 more
wiley   +1 more source

Flight-Log-Based Assessment and Center-of-Gravity-Oriented Redesign of a Large Flying-Wing VTOL UAV [PDF]

INCAS Bulletin
This study evaluates the VTOL behaviour of a 4.18 m-span, 15.5 kg flying-wing UAV and proposes a simplified propulsion-layout redesign. Three flights of the original tri-rotor configuration were analysed using attitude, motor and servo PWM, altitude, and
Gabriel-Petre BADEA, Daniel-Eugeniu CRUNTEANU   +1 more
doaj   +1 more source