Results 261 to 270 of about 18,526 (302)

Marking Tests to Certify Part Identification Processes for Use in Low Earth Orbit

, 2015
Don Roxby
openalex   +1 more source

Complex Cryptographic and User‐Centric Physically Unclonable Functions Enabled by Strain‐Sensitive Nanocrystals via Selective Ligand Exchange

Advanced Functional Materials, EarlyView.
This study investigates electromechanical PUFs that improve on traditional electric PUFs. The electron transport materials are coated randomly through selective ligand exchange. It produces multiple keys and a key with motion dependent on percolation and strain, and approaches almost ideal inter‐ and intra‐hamming distances.
Seungshin Lim, Hanseok Seo, Taesung Park, Byung Ku Jung, Junhyeok Park, Young Kyun Choi, Dae Yang Oh, Soong Ju Oh   +7 more
wiley   +1 more source

Covalent Organic Frameworks for Water Sorption: The Importance of Framework Physical Stability

Advanced Functional Materials, EarlyView.
This study explores the water‐vapor stability of 2D covalent organic frameworks (COFs) with varying pore sizes. Results reveal microporous COFs demonstrate superior stability compared to mesoporous ones, despite lower water uptake. Mesoporous keto‐enamine‐linked COFs show enhanced stability due to intralayer hydrogen bonds, confirmed by simulations and
Wei Zhao, He Li, Bui Duc Thuan, Weidong Chen, Qiang Zhu, Mounib Bahri, Boyu Li, Kexin Yu, Chengjun Kang, Ting Chen, Zekun Wang, Nigel D. Browning, Kian Jon Chua, Dan Zhao   +13 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, 1997
Summary: 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.
openaire   +2 more sources

Low Earth Orbit

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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Optimal, Low-Thrust, Earth-Moon Orbit Transfer

Journal of Guidance, Control, and Dynamics, 1998
We find optimal, low-thrust, Earth-Moon orbit transfers by using the method of collocation with nonlinear programming. The initial spacecraft Earth orbit is arbitrary; the final lunar orbit is arbitrary. The Moon is in its actual orbit. The vehicle dynamics include the effect of Moon's gravity during the Earth-departure phase and the effect of Earth's ...
Herman, Albert L., Conway, Bruce A.
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Low Earth Orbits (LEO)

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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Designing continuous-thrust low-Earth-orbit to geosynchronous-Earth-orbit transfers

Journal of Spacecraft and Rockets, 1995
This paper examines a method that can he used to transfer a spacecraft from a circular low Earth orbit (LEO), inclined to the equator, to a circular geosynchronous Earth orbit (GEO) with no inclination. The principle is to minimize the propulsive-mass cost for a continuously thrusting vehicle with the capability for multiple on-off thrusting cycles ...
David B. Spencer, Robert D. Culp
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Precise Autonomous Orbit Control in Low Earth Orbit

AIAA/AAS Astrodynamics Specialist Conference, 2012
This paper analyses the problem of the autonomous absolute orbit control of a space- craft in low Earth orbit using different on-board feedback control systems. Three types of control are compared. The first implements an analytical control algorithm. The second and third controllers considered are the linear and the quadratic optimum regulator from
De Florio, S., D'Amico, S., Radice, G.
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Mosses in Low Earth Orbit

2019
As a part of the European Space Agency mission "EXPOSE-R2" on the International Space Station (ISS), the BIOMEX (Biology and Mars Experiment) experiment investigates the habitability of Mars and the limits of life. In preparation for the mission, experimental verification tests and scientific verification tests simulating different combinations of ...
Huwe, Björn, Fiedler, Annelie, Moritz, Sophie, Rabbow, Elke, de Vera, Jean-Pierre Paul, Joshi, Jasmin Radha   +5 more
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