Results 81 to 90 of about 1,576 (295)

The Development of a Next-Generation Latticed Resistojet Thruster for CubeSats

Aerospace
CubeSat and small satellite resistojet heat exchanger designs are based on conventional concepts that have been used since the 1960s, being primarily limited to helical or twisted tape heat exchangers.
Daniel Turner, Robert Howie, Phil Bland
doaj   +1 more source

Novel Activated Metal Powders for Improved Hybrid Fuels and Green Solid Propellants

, 2016
The necessity of novel and specialized ingredients for peculiar applications like green solid propellants and fast hybrid fuels is boosting the research of energetic materials to replace conventional metals.
PARAVAN, CHRISTIAN, Di Lorenzo, Marco, GALFETTI, LUCIANO, DOSSI, STEFANO, Stefano Dossi, Christian Paravan, MAGGI, FILIPPO, Jovan Ardalic, Ardalic, Jovan, Marco Di Lorenzo, Filippo Maggi, Luciano Galfetti   +11 more
core   +1 more source

Soft Robotic Snake with Tunable Undulatory Gait for Efficient Underwater Locomotion

Advanced Robotics Research, EarlyView.
This study designs an underwater soft snake robot using 3D‐printed soft actuators, controlled by specific signals to generate sinusoidal undulation. Results show a positive correlation between speed and swing amplitude, with optimal performance at 2/3π phase offset, PLA tail, 1.2 voltage growth rate, and 6s undulation period achieving a maximum speed ...
Huichen Ma, Junjie Zhou, Raye Yeow
wiley   +1 more source

Decomposition of H₂O₂ on Monolithic MnO_x/ZrO₂ Catalysts for Aerospace Application

Chemical Engineering Transactions, 2015
Hydrogen peroxide is widely recommended in aerospace field for propulsive applications for the high energy density and for its “green” nature due to low toxicity and low environmental impact in comparison with conventional propellants (N2H4, N2O4 ...
L. Micoli, M. Turco
doaj   +1 more source

Dynamics of electrically controlled propellant valves for “green”-propellant thrusters

Technical mechanics
Recently, the leading space countries have paid much attention to searching for and using new types of untoxic “green” propellants. Developments of 0.1 N to 220 N “green”-propellant thrusters have been reported, and some of them have been successfully tested in flight conditions.
openaire   +1 more source

Preparation and Properties of a Novel High-Toughness Solid Propellant Adhesive System Based on Glycidyl Azide Polymer–Energetic Thermoplastic Elastomer/Nitrocellulose/Butyl Nitrate Ethyl Nitramine

, 2023
Glycidyl azide polymer (GAP)–energetic thermoplastic elastomer (GAP-ETPE) propellants have high development prospects as green solid propellants, but the preparation of GAP-ETPEs with excellent performance is still a challenge.
Zhen Wang, Jing Zhang, Shixiong Sun, Yunjun Luo   +3 more
core   +1 more source

Strong‐Magnetic Flexible Composites for Magnetically Responsive Soft Robots

Advanced Robotics Research, EarlyView.
This perspective provides an overview of the performance mechanisms, preparation methods, and applications of strong magnetic flexible composite materials in soft actuators (such as gripping, movement, and sensing), and further explores current opportunities and challenges.
Wenwen Li, Shuai Liu, Xinyi Wang, Xinglong Gong, Shouhu Xuan   +4 more
wiley   +1 more source

Current State of the Art of HNF based Composite Propellants

, 2004
The main activities currently performed for the development of HNF-based propellants are presented. The objectives and approach adopted are described. The results obtained on the HNF decomposition mechanism and on the re- and co-crystallisation of HNF ...
van der Heijden A. E. D. M., Leeming, B., Leeming B:, Ciucci A., Brotzu, A., Frota O:, BROTZU, Andrea, Bellerby J. M., Welland, W.H.M., Frota, O., Welland W. H. M., Ciucci, A., Heijden, A.E.D.M. van der, Bellerby, J.M.   +13 more
core  

Hard‐Magnetic Soft Millirobots in Underactuated Systems

Advanced Robotics Research, EarlyView.
This review provides a comprehensive overview of hard‐magnetic soft millirobots in underactuated systems. It examines key advances in structural design, physics‐informed modeling, and control strategies, while highlighting the interplay among these domains.
Qiong Wang, Zixuan Zhang, Bingyan Li, Junkai Wang, Hongcheng Gu   +4 more
wiley   +1 more source

Ionic liquid-H2O2 propellants and their ignition behavior

Propulsion and Energy
As the primary power source, propellants enable faster and more distant space exploration. While the traditional hydrazine-based bipropellants are gradually replaced due to their extreme volatility and carcinogenicity, ionic liquid-H2O2 has become an ...
Qing Cheng, Long Liu, Peihao Dou, Yingying Cao, Xing Zhang, Yanqiang Zhang   +5 more
doaj   +1 more source