Results 81 to 90 of about 295,166 (297)
Nihon Kikai Gakkai ronbunshu, 2015 As low-thrust propulsion technology becomes increasingly popular, orbital estimation for low-thrust spacecraft may become an area of increasing interest. More frequent use of low-thrust propulsion to place satellites in orbit gives more opportunities for
Naoki DATE, Mai BANDO, Shinji HOKAMOTO
doaj +1 more source
Engineering stimuli‐responsive shape‐morphing through high‐resolution 4D printing
Responsive Materials, EarlyView.This review summarizes recent progress in high‐resolution 4D printing with smart materials and micro/nanoscale techniques. It covers actuation strategies, key applications, and future challenges for scalable, precise shape‐morphing systems. Abstract 4D printing extends conventional additive manufacturing (AM) by enabling dynamic shape‐morphing ...
Shuheng Li +10 more
wiley +1 more source
Recent progress and perspectives of space electric propulsion systems based on smart nanomaterials
Nature Communications, 2018 Miniaturized spacecraft built from advanced nanomaterials are poised for unmanned space exploration. In this review, the authors examine the integration of nanotechnology in electric propulsion systems and propose the concept of self-healing and adaptive
I. Levchenko +5 more
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Trapping Xe in Nanocages Using a Plasma
Small Science, EarlyView.Silicate nanocages supported on metal powders trap xenon (Xe) atoms when exposed to a Xe plasma. Three major advances are achieved in this work including trapping Xe in (1) high‐surface‐area powder materials, using (2) a nonprecious metal support, and (3) a simple ionization method.
Laiba Bilal +8 more
wiley +1 more source
Journal of Engineering Research and ReviewsThe ever-growing desire to explore the cosmos compels us to seek more efficient and sustainable methods for space travel. Conventional rocket propulsion, reliant on the expulsion of propellant, presents limitations in terms of cost and environmental ...
Mostafa Essam Eissa
doaj +1 more source
Variable Side-Look Angle Concept For Radar Mapping [PDF]
, 1974 Radar mapping of planets can be accomplished at lower cost and with reduced emphasis on propulsion system capability from spacecraft operating in elliptical orbit than from circular ...
Vandenberg, Frank A.
core +1 more source
Global Policy, EarlyView.ABSTRACT The European Union's proposed Space Law aims to establish a unified approach for sustainable space activities across the EU. While the EU's satellite constellations contribute to sustainability efforts, they can also have negative environmental impacts.
Elena Cirkovic, Vitali Braun
wiley +1 more source
Cartography of Accident Causation Models: Remapping the Modeling Landscape
Risk Analysis, EarlyView.ABSTRACT Accident causation models are abstractions of the real world that explicitly or implicitly underlie our perception and understanding of accidents. As the continuous advancement of our dynamic society demands us to keep updating our understanding of accidents, this review article provides an overview of the landscape of accident causation ...
Takaharu Igarashi, Karen Marais
wiley +1 more source
Novel pole-sitter mission concepts for continuous polar remote sensing [PDF]
, 2012 The pole-sitter concept is a solution to the poor temporal resolution of polar observations from highly inclined, low Earth orbits and the poor high latitude coverage from geostationary orbit.
Ceriotti, Matteo +2 more
core +2 more sources
Experimental Physiology, EarlyView.Abstract Manned space exploration to distant destinations, including Mars, continues to be an aspiration of humankind. Space travel does, however, present many challenges to the body, amongst which adaptation to microgravity is perhaps the largest. For instance, both short and long manned spaceflight missions have shown substantial deleterious effects ...
Gerard McMahon +2 more
wiley +1 more source