Results 21 to 30 of about 195,565 (345)

Aircraft Hybrid-Electric Propulsion: Development Trends, Challenges and Opportunities

Journal of Control Automation and Electrical Systems, 2021
The present work is a survey on aircraft hybrid electric propulsion (HEP) that aims to present state-of-the-art technologies and future tendencies in the following areas: air transport market, hybrid demonstrators, HEP topologies applications, aircraft ...
M. A. Rendón, Carlos D. Sánchez R., Josselyn Gallo M., Alexandre H. Anzai   +3 more
semanticscholar   +1 more source

A Novel Integrated Gliding and Flapping Propulsion Biomimetic Manta-Ray Robot

Journal of Marine Science and Engineering, 2022
Bionic underwater robots are the intersection of biology and robotics; they have the advantages of propulsion efficiency and maneuverability. A novel vehicle that combines a gliding and flapping propulsion inspired by a manta ray is presented in this ...
Daili Zhang, Guang-xu Pan, Yonghui Cao, Qiaogao Huang, Yonghui Cao   +4 more
semanticscholar   +1 more source

Propulsion tests on ultra-high-temperature ceramic matrix composites for reusable rocket nozzles

Journal of Advanced Ceramics, 2023
Ultra-high-temperature ceramic matrix composites (UHTCMCs) based on a ZrB2/SiC matrix have been investigated for the fabrication of reusable nozzles for propulsion.
Diletta Sciti, Antonio Vinci, Luca Zoli, Pietro Galizia, Simone Failla, Stefano Mungiguerra, Giuseppe D. Di Martino, Anselmo Cecere, Raffaele Savino   +8 more
doaj   +1 more source

In-orbit demonstration of an iodine electric propulsion system

Nature, 2021
Propulsion is a critical subsystem of many spacecraft1–4. For efficient propellant usage, electric propulsion systems based on the electrostatic acceleration of ions formed during electron impact ionization of a gas are particularly attractive5,6.
D. Rafalskyi, Javier Martínez Martínez, L. Habl, Elena Zorzoli Rossi, P. Proynov, Antoine Boré, Thomas Baret, Antoine Poyet, T. Lafleur, S. Dudin, A. Aanesland   +10 more
semanticscholar   +1 more source

Comparison of Active Drag Using the MRT-Method and the MAD-System in Front Crawl Swimming

Proceedings, 2018
The purpose of this study was to compare the active drag values estimated by the MRT-method and the MAD-system. Six male competitive swimmers participated in this study and performed front crawl with arms only condition.
Kenzo Narita, Futoshi Ogita, Motomu Nakashima, Hideki Takagi   +3 more
doaj   +1 more source

Numerical Study on Fluid Dynamic Characteristics of a Cross-Flow Fan

Journal of Marine Science and Engineering, 2023
This paper focuses on the application of a cross-flow fan (CFF) to generate propulsion for a submersible aircraft with a flying wing configuration. A numerical method is established to simulate the CFF operating both in the air and underwater. This paper
Xiaowei Cai, Chun Zhang, Baoshou Wang
doaj   +1 more source

Stabilized detonation for hypersonic propulsion

Proceedings of the National Academy of Sciences of the United States of America, 2021
Significance There is now an intensifying international effort to develop robust propulsion systems for hypersonic and supersonic flight. Such a system would allow flight through our atmosphere at very high speeds and allow efficient entry and exit from ...
D. Rosato, Mason Thornton, Jonathan Sosa, Christian Bachman, Gabriel B. Goodwin, K. Ahmed   +5 more
semanticscholar   +1 more source

Fan Stage Design and Performance Optimization for Low Specific Thrust Turbofans

International Journal of Turbomachinery, Propulsion and Power, 2023
In modern turbofan engines, the bypass section of the fan stage alone provides the majority of the total thrust required in cruise, and the size of the fan has a considerable effect on the overall engine weight and nacelle drag.
Oliver Sjögren, Tomas Grönstedt, Anders Lundbladh, Carlos Xisto   +3 more
doaj   +1 more source

Associations between load-velocity profiling and race parameters of elite swimmers in the 100 and 200m freestyle events

Frontiers in Sports and Active Living, 2023
IntroductionImproving swimming performance involves assessments of biomechanical variables of the stroke, and it can be achieved using semi-tethered swimming tests. The aim of this study was thus to investigate the associations between load-velocity (L-V)
Yannis Raineteau, Yannis Raineteau, Guillaume Nicolas, Guillaume Nicolas, Benoit Bideau, Benoit Bideau, Nicolas Bideau, Nicolas Bideau, Robin Pla   +8 more
doaj   +1 more source

Bionic Propulsion on Water and Measurement of Propulsion

Physics Procedia, 2012
AbstractTraditional propulsion fashion on water are propeller propulsion and jet propulsion, but the efficiency relatively low. Used by biological propulsion, after the last million years of evolution, the maximum utilization of its power. Bionic propulsion system designed in this paper consists of two large travel umbrella wing plate in reciprocating ...
Zhao Si-yuan, Li Rong-xiang, Tu Shan-chao, Liu Yun, Zhu Tian-yu   +4 more
openaire   +2 more sources