Results 11 to 20 of about 173,822 (304)
A Study on the Propulsion Performance in the Actual Sea by means of Full-scale Experiments [PDF]
TransNav, 2013 The IMO has adopted Energy Efficiency Design Index (EEDI), Ship Energy Efficiency Management Plan (SEEMP) and Energy Efficiency Operational Indicator (EEOI) in order to reduce GHG emissions from international shipping.
Jun Kayano +3 more
doaj +1 more source
Principle, Fabrication and Emerging Applications of Nanobottle Motor
Energies, 2022 Micro/nano-motors play an important role in energy, environment, and biomedicines. As a new type of nano-motors, nanobottles attract great attention due to their distinct advantages of a large cavity, high specific surface area, bionic streamline ...
Qingyuan Liu +4 more
doaj +1 more source
Power Prediction Method for Ships Using Data Regression Models
Journal of Marine Science and Engineering, 2023 This study proposes machine learning-based prediction models to estimate hull form performance. The developed models can predict the residuary resistance coefficient (CR), wake fraction (wTM), and thrust deduction fraction (t). The multi-layer perceptron
Yoo-Chul Kim +5 more
doaj +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 +8 more
doaj +1 more source
CFD Analysis of De Laval Nozzle of a Hybrid Rocket Engine [PDF]
E3S Web of Conferences: The study gives a general overview of the CFD-simulated gas flow via the nozzle of a De Laval rocket engine. In CFD software, the mesh is generated using the nozzle’s geometry.
Ahmad Mohamed Tarmizi +6 more
doaj +1 more source
Efficiency of fish propulsion [PDF]
Bioinspiration & Biomimetics, 2015 It is shown that the system efficiency of a self-propelled flexible body is ill-defined unless one considers the concept of quasi-propulsive efficiency, defined as the ratio of the power needed to tow a body in rigid-straight condition over the power it needs for self-propulsion, both measured for the same speed. Through examples we show that the quasi-
Maertens, Audrey +2 more
openaire +5 more sources
Wave, 2021 This study is to investigate propulsion efficiency due to changes in draught of ship using data series and theoretical approach. A hard chain rescue boat with triplet screw was used for the study and to examine the effect of thrust deduction factor and ...
Muhammad Sawal Baital +3 more
doaj
THE FUTURE OF SPACECRAFT NUCLEAR PROPULSION [PDF]
, 2014 This paper summarizes the advantages of space nuclear power and propulsion systems. It describes the actual status of international power level dependent spacecraft nuclear propulsion missions, especially the high power EU-Russian MEGAHIT study ...
Jansen, Frank, F. JANSEN
core +1 more source
Journal of Experimental Biology, 2006 <p>Published - <a href="/records/9h45s-c7678/files/BROjeb06.pdf?download=1">BROjeb06.pdf</a></p>
openaire +2 more sources
Displaced geostationary orbit design using hybrid sail propulsion [PDF]
, 2011 Due to an increase in number of geostationary spacecraft and limits imposed by east-west spacing requirements, the geostationary orbit is becoming congested.
Biggs, James +3 more
core +3 more sources