Results 51 to 60 of about 174,771 (214)
Advances in Mechanical Engineering, 2016 In recent years, unmanned aerial vehicles have gained increasing popularity. They are employed in many applications due to its features in terms of flexibility, low cost, and small size.
Jialiang Wang +5 more
doaj +1 more source
Earth and Space Science, Volume 13, Issue 8, August 2026.Abstract Accurately estimating Snow Water Equivalent (SWE) in glacierized regions is critical for glacier modeling and mass balance analysis yet remains challenging due to sparse observations and uncertainties in precipitation products. The objectives are twofold: (a) assess how well three widely used precipitation datasets—Stage IV (a radar–gauge ...
Yang Song, Ali Behrangi
wiley +1 more source
DronesUnmanned helicopters are always subject to various external disturbances and constraints when performing tasks. In this paper, an extended state observer-based command-filtered safe tracking control scheme is investigated for an unmanned helicopter under
Haoxiang Ma +4 more
doaj +1 more source
Earth and Space Science, Volume 13, Issue 8, August 2026.Abstract Satellite data have been used to estimate the three‐dimensional orientation of features on Mars inferred to be bedding planes to support interpretations of deposit characteristics and depositional environments. Opportunities to ground‐truth these estimates and to understand the geologic information recorded by surfaces measured from orbit are ...
O. A. Kanine +2 more
wiley +1 more source
High Voltage, Volume 11, Issue 4, Page 1090-1101, August 2026.ABSTRACT Power lines in synthetic‐aperture radar (SAR) images are reflected as point signatures, which fluctuate annually in both the azimuth and range directions. A novel framework is proposed in this paper to evaluate the four‐dimensional dynamic status of power line sag using those point signatures in time‐series SAR images.
Sijie Ma +4 more
wiley +1 more source
Design of an Optimal Fuzzy Controller for Hover mode of Finite Degree of Freedom Unmanned Helicopter [PDF]
Journal of Intelligent Procedures in Electrical Technology, 2012 A helicopter has nonlinear dynamics and it’s a multivariable system. A helicopter is an unstable plant with high level of interaction between some of its variables.
Sina Ameli +2 more
doaj
Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.Abstract Lava tubes and caves are key exploration targets on the Moon and Mars due to their potential to serve as natural infrastructure for future crewed missions. However, identifying these structures efficiently and reliably remains a major challenge.
J. Martin de Blas +6 more
wiley +1 more source
Reconfigurable unmanned aerial vehicles
, 2009 Unmanned Aerial Vehicles (UAVs) have been developing dramatically due to wars and miniaturisation of technology, which has made the UAV industry a very lucrative business. Research organisations have been funded by various research committees or military
Barlow, Chris +5 more
core +1 more source
Jixie chuandong, 2018 For unmanned helicopter economic cruises,main rotor speed changes could be significant. At present,the most effective method of changing the main rotor speed associated with the great speed range and low cost is a variable speed gear transmission ...
Li Zhengminqing +4 more
doaj
Asian Politics &Policy, Volume 18, Issue 3, July 2026.ABSTRACT Gray‐zone activities have become a central feature of security competition in East Asia, particularly in the Taiwan Strait, where persistent military operations blur the boundary between coercion and armed conflict. This study develops a structured threat‐assessment framework for evaluating the intensity of PLA aerial gray‐zone pressure around
Shih‐Yin Liang, Hsuan‐Lei Shao
wiley +1 more source