Results 221 to 230 of about 9,161,553 (268)
Advanced Engineering Materials, EarlyView.This study applies machine learning regression to predict chromium layer thickness in decorative trivalent chromium electroplating, using 441 experiments from laboratory‐scale (1L) and pilot‐scale (14L) setups. Tree‐based models, particularly CatBoost, outperformed linear regression by capturing nonlinear parameter interactions (R2$R^2$ up to 0.77 ...
Christoph Baumer +4 more
wiley +1 more source
Comparison of Triply Periodic Minimal Surface Energy Absorbers Under Uniaxial Compressive Loading
Advanced Engineering Materials, EarlyView.This study investigates LCD 3D printed Triply Periodic Minimal Surface (TPMS) structures as mechanical energy absorbers. By comparing various base designs and layered combinations under uniaxial compression, it identifies that a Diamond‐Gyroid sandwich structure offers superior performance.
Sergej Grednev +2 more
wiley +1 more source
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Optimal Low-Earth-Orbit-Geostationary-Earth-Orbit Intermediate Acceleration Orbit Transfer
Journal of Guidance, Control, and Dynamics, 1997Summary: The problem of minimum-time orbit transfer using intermediate acceleration is analyzed using both precise integration and averaging. Continuous constant accelerations of the order of \(10^{-2}g\) are considered for applications using nuclear propulsion upper stages.
Jean Albert Kéchichian
exaly +3 more sources
2020
Low Earth orbit or LEO will be covered to a greater extent in this book than other types of space systems for a multitude of reasons. The most important to me is that as space becomes more reachable and feasible for varying organizations to operate within, that accessibility will begin at LEO first.
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Low Earth orbit or LEO will be covered to a greater extent in this book than other types of space systems for a multitude of reasons. The most important to me is that as space becomes more reachable and feasible for varying organizations to operate within, that accessibility will begin at LEO first.
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The Radiation Environment in Low-Earth Orbit
Radiation Research, 1997The radiation environment in low-Earth orbit is a complex mixture of galactic cosmic radiation, particles of trapped belts and secondary particles generated in both the spacecraft and Earth's atmosphere. Infrequently, solar energetic particles are injected into the Earth's magnetosphere and can penetrate into low-Earth orbiting spacecraft.
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IEEE Spectrum, 2014
NASA has found itself curiously earthbound of late. Since it retired the space shuttles in 2011, the U.S. space agency has had to send astronauts to the International Space Station aboard Russian rockets.
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NASA has found itself curiously earthbound of late. Since it retired the space shuttles in 2011, the U.S. space agency has had to send astronauts to the International Space Station aboard Russian rockets.
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Evolved spacecraft trajectories for low earth orbit
Proceedings of the 2014 Annual Conference on Genetic and Evolutionary Computation, 2014In this paper we use Differential Evolution (DE), with best evolved results refined using a Nelder-Mead optimization, to solve complex problems in orbital mechanics relevant to low Earth orbits (LEO). A class of so-called 'Lambert Problems' is examined.
David W. Hinckley Jr. +3 more
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Inter-satellite ranging in the Low Earth Orbit
2016 10th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP), 2016Many satellite systems require knowledge about inter-satellite distances. Inter-satellite links provide direct connectivity between satellites and may be used for ranging, while they remove the need of dedicated hardware. This paper addresses inter-satellite ranging at the Low Earth Orbit (LEO) using S-Band signals. We take the requirements from recent
Mohammad Alawieh +3 more
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2010 20th International Crimean Conference "Microwave & Telecommunication Technology", 2010
The handheld portable satellite phones, semifixed satellite payphones and remote offices including Satellite Broadband, Satellite Asset Tracking and Fleet Management (SATFM), Satellite Supervisory Control and Data Acquisition (SCADA) or Machine-to-Machine (M2M) monitoring, control, command and logistics system are a very new communications tools ...
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The handheld portable satellite phones, semifixed satellite payphones and remote offices including Satellite Broadband, Satellite Asset Tracking and Fleet Management (SATFM), Satellite Supervisory Control and Data Acquisition (SCADA) or Machine-to-Machine (M2M) monitoring, control, command and logistics system are a very new communications tools ...
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Performance of a BGO detector in low Earth orbit
IEEE Transactions on Nuclear Science, 1991A 7.6-cm*7.6-cm BGO (bismuth germanate) detector was flown in the middeck of the Space Shuttle Columbia August 8-13, 1989, as part of the Shuttle Activation Monitor (SAM) experiment. One of the goals of this experiment was to compare the performance of the BGO to that of NaI in the same environment.
P.S. Haskins +9 more
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