Results 31 to 40 of about 20,787 (234)

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

Cross‐Scale Hierarchical Targeted Delivery System Based on Small‐Scale Magnetic Robots

Advanced Robotics Research, EarlyView.
This article reviews a cross‐scale hierarchical targeted delivery system that integrates magnetic continuum robots and magnetic microrobots. By combining rapid long‐range navigation with precise microscale targeting, the system overcomes key limitations of single‐scale approaches.
Junjian Zhou, Zhiqiang Chen, Yuanbiao Ma, Zhiqiang Tang, Qianqian Wang   +4 more
wiley   +1 more source

The structure of knowledge base to support the development of low-thrust liquid-propellant rocket engines based on computer technologies

Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2022
Some data on the knowledge base to support the development of low-thrust liquid-propellant rocket engines using computer technologies are presented. The structure of the base is proposed on the basis of characteristic features of engines, including the ...
V. V. Ryzhkov
doaj   +1 more source

Precipitation‐Modulated Harmonic Architectures Enable Superior Strength–Ductility Synergy from Cryogenic to Elevated Temperatures in Nanostructured Alloys

Advanced Science, EarlyView.
Precipitation‐modulated recrystallization enables a programmable bimodal harmonic architecture in a high‐entropy alloy, delivering 1–2 GPa yield strength with >10% ductility from −196 °C to 700 °C. The resulting broad‐temperature robustness arises from the synergy of dual‐mode nanoprecipitation, harmonic core–shell topology, and temperature‐adaptive ...
Wei Li, Liangyin Xiong, Mengchao Niu, Junhua Luan, Wei Wang, Zengbao Jiao   +5 more
wiley   +1 more source

Rejuvenated Amorphous Alloys: Processing Methods, Microstructures and Mechanical Properties

Advanced Science, EarlyView.
Three rejuvenation methods – mechanical and thermal rejuvenation, and other rejuvenation routes such as ultrasonic processing – can be used to modify structures of glassy alloys, especially atomic clusters, and therefore enhances plasticity and activates work‐hardening behaviors.
Can Yang, Yu Chen, Chunguang Tang, Si Lan, Jun Tan, Heng Ye, Hua Chen, Zhifu Yao, Jürgen Eckert, Dongxian Zhang, Jian‐Zhong Jiang   +10 more
wiley   +1 more source

Rotating Bending Fatigue Behavior of AlSi10Mg Fabricated by Powder Bed Fusion-Laser Beam: Effect of Layer Thickness

Crystals
A single batch of AlSi10Mg powder was used to fabricate two groups of round bars via horizontal printing, employing an identical strategy except for one parameter in the process of powder bed fusion-laser beam. The parameter is layer thickness, set at 50
Lu Liu, Shengnan Wang, Yifan Ma
doaj   +1 more source

An Investigation of the Relationship Between Central Bank Unconventional Monetary Policy and Bitcoin Activity

International Journal of Finance &Economics, EarlyView.
ABSTRACT This article investigates whether the unconventional monetary policy (UMP) measures pursued by the Federal Reserve, the Bank of England, the Bank of Japan, and the European Central Bank since the Global Financial Crisis (GFC) are associated with an appetite for cryptocurrency.
Niamh Wylie, Martha O'Hagan‐Luff
wiley   +1 more source

Advances in phase stabilization techniques of AN using KDN and other chemical compounds for preparing green oxidizers

Defence Technology, 2019
Research and development of green oxidizers and green fuels as a possible replacement for ammonium perchlorate (NH4ClO4, AP) and hydrazine (N2H4) respectively has been increased considerably in the recent years. AP and hydrazine are the oxidizer and fuel
Pratim Kumar
doaj   +1 more source

Numerical analysis of LOx-BioLPG combustion in high-pressure liquid rocket engine propulsion system

South African Journal of Chemical Engineering, 2023
The present work numerically investigates the steady state LOx-BioLPG combustion in a high-pressure liquid rocket engine propulsion system, based on the RANS approach using Eulerian single-phase thermo-chemical modeling with Peng-Robinson equation of ...
Md.Rhyhanul Islam, Zahir U. Ahmed, Khandkar Aftab Hossain   +2 more
doaj   +1 more source

Recent progress in modeling of cryogenic cavitation for liquid rocket propulsion

Progress in Aerospace Sciences, 2005
Abstract Thermal effects substantially impact the cavitation dynamics of cryogenic fluids. The present article reviews recent progress made toward developing modeling and computational strategies to simulate cryogenic cavitation relevant to liquid rocket propulsion applications.
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA ( host institution ), Utturkar, Yogen ( author ), Wu, Jiongyang ( author ), Wang, Guoyo ( author ), Shyy, Wei ( author )   +4 more
openaire   +2 more sources