Results 261 to 270 of about 220,920 (303)
Advanced Functional Materials, EarlyView.A dual‐layer living hydrogel, ProΦGel, integrates bacteriophages and probiotics for synergistic wound infection therapy. The outer gelatin‐based matrix releases phages on demand in response to P. aeruginosa infections, while inner alginate beads sustain probiotic delivery.
Siyuan Tao +6 more
wiley +1 more source
Advanced Functional Materials, EarlyView.Polymorph engineering in ErMnO3 enables low‐voltage, forming‐free threshold switching with tunable negative differential resistance. Conducting orthorhombic regions embedded in an insulating hexagonal matrix provide controlled Joule‐heating‐enhanced Poole–Frenkel transport. The hexagonal phase prevents excessive heating and breakdown.
Rong Wu +8 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.
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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.
openaire +1 more source
Optimal, Low-Thrust, Earth-Moon Orbit Transfer
Journal of Guidance, Control, and Dynamics, 1998We 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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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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Designing continuous-thrust low-Earth-orbit to geosynchronous-Earth-orbit transfers
Journal of Spacecraft and Rockets, 1995This 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, 2012This 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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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 +5 more
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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 +5 more
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Small Low-Earth-Orbiting payloads
6th Sounding Rocket Conference, 1982There are a wide variety of scientific, military, and commerical missions and applications that can be performed by small, Low-Earth-Orbiting (LEO) satellites. There will be many opportunities in the 80's to exploit small LEO satellites for communication, data collection, navigation, location and tracking, earth resources, and space processing ...
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