Results 31 to 40 of about 4,234 (146)

A flight dynamics investigation of compound helicopter configurations [PDF]

, 2013
Compounding has often been proposed as a method to increase the maximum speed of the helicopter. There are two common types of compounding known as wing and thrust compounding.
Ferguson, K., Thomson, D.
core  

Emerging Molecular Antiferroelectrics: Advances and Prospects

Advanced Science, Volume 13, Issue 25, 4 May 2026.
This review focuses on the current research progress in emerging molecular antiferroelectrics, encompassing their diverse structures, antiferroelectricity‐associated properties, and application exploration, including energy storage, electrocaloric refrigeration, and electrostriction.
Xiaoqi Li, Qianxi Wang, Xiaoyu Zhang, Yating You, Zhihua Sun, Xitao Liu, Junhua Luo   +6 more
wiley   +1 more source

Aerodynamic Layout Design of a Compound Conventional Rotor High-Speed Unmanned Helicopter

Drones
High-speed capability is a defining feature of next-generation helicopters, enabling time-sensitive missions. This paper compares three high-speed configurations: tiltrotor, coaxial rigid rotor, and compound conventional rotor.
Long He, Liangquan Wang, Shipeng Yang, Jinwu Xiang, Qinghua Zhu, Dongxia Xu   +5 more
doaj   +1 more source

Subterranean Mine Inspection Using the Prometheus Re‐Configurable Drone

Journal of Field Robotics, Volume 43, Issue 3, Page 1646-1660, May 2026.
ABSTRACT This paper describes the design, development, and real‐world testing of an autonomous drone for subterranean exploration, known as “Prometheus.” Driven by requirements from industry that the drone be able to be deployed through areas of restricted access, Prometheus was designed to be directly deployed through a 150 mm aperture.
Liam Brown, Robert Clarke, Ali Akbari, Ferdian Jovan, Jameel Marafie, Ognjen Marjanovic, Sara Bernardini, Tom Richardson, Simon Watson   +8 more
wiley   +1 more source

The Future of Hydrogen‐Powered Aviation: Technologies, Challenges, and a Strategic Roadmap for Sustainable Decarbonization

Advanced Energy and Sustainability Research, Volume 7, Issue 3, March 2026.
Hydrogen‐powered aviation offers a transformative pathway to zero‐emission flight by eliminating in‐flight CO2 emissions. Key considerations include propulsion systems (fuel cells and hydrogen combustion), cryogenic storage and insulation challenges, infrastructure and cost barriers, and supply‐chain constraints.
Mubasshira, Md Mahbubur Rahman, Karib Hassan Khan, Md Nizam Uddin, Dewan Hafiz Nabil   +4 more
wiley   +1 more source

Design Challenges to Expand the Functionality of Drones: Deformable Rotorcraft and Nature‐Inspired Flapping Drones

Advanced Intelligent Systems, Volume 8, Issue 3, March 2026.
This review systematically analyzes deformable drones, including extendable, foldable, and tilting configurations, along with nature‐inspired flapping rotorcraft. By classifying deformation principles and structural mechanisms, design trade‐offs, functional capabilities, and future development potential are highlighted.
Ju‐Hee Lee, Sumin Jung, Jinwoo Jang, Yeji Han, Minchae Kang, Jihun Seong, Suyeon Seo, Eunsol Park, Haesol Kwak, Min‐Woo Han   +9 more
wiley   +1 more source

Ions as Architects of DNA Nanostructures: Mechanisms, Simulations, and Technological Frontiers

Small Structures, Volume 7, Issue 3, March 2026.
Ions are not merely passive electrolytes but active regulators of DNA nanostructures. This review shows how ion valence, hydration, and specificity govern electrostatic screening, correlation, and confinement, enabling DNA origami, metallized DNA, nanopores, hydrogels, DNAzymes, molecular machines, and energy devices through integrated experimental and
Sergiy Perepelytsya, Dmytro Piatnytskyi, Tetiana Bubon, Narcis Cibotariu, Aatto Laaksonen, Francesca Mocci   +5 more
wiley   +1 more source

Ground resonance analysis using a substructure modeling approach [PDF]

, 1985
A convenient and versatile procedure for modeling and analyzing ground resonance phenomena is described and illustrated. A computer program is used which dynamically couples differential equations with nonlinear and time dependent coefficients.
Austin, E. E., Berman, A., Chen, S. Y.
core   +1 more source

Design and Analysis of a 6‐Speed Coaxial Magnetic Gearbox With Axial Gear Shifting Mechanism for Automotive Applications

IET Electric Power Applications, Volume 20, Issue 1, January/December 2026.
This paper proposes a multi‐stage magnetic gearbox (MSMG) designed for automotive applications. The proposed architecture provides six distinct gear ratios within an integrated system. By effectively suppressing eddy current losses through adaptive segmentation, this design ensures robust performance for high‐power propulsion systems.
Ali Hosseini‐Fard, Seyed Hamid Shahalami, Esmaeil Fallah Choolabi   +2 more
wiley   +1 more source

Field Monitoring Study on Load‐Bearing Performance of Adjustable Pile‐Supported Wind Turbine Foundation in Open‐Pit Mine Dump Sites

Advances in Civil Engineering, Volume 2026, Issue 1, 2026.
To investigate the operational stress response and load‐transfer mechanisms of adjustable pile‐supported wind turbine foundation in open‐pit mine dump environments, a site‐specific monitoring scheme was developed for open‐pit mine dump environments, incorporating structural features of the foundation system.
Jin Xu, Fanhua Wang, Huibo Fan, Bin Liang, Gang Lu, Deping Wang, Jinkui Shi, Huanwei Wei, Fang Tan, Mustafa Zeybek   +9 more
wiley   +1 more source