Results 11 to 20 of about 67,240,934 (242)
Extension of the sun-synchronous Orbit [PDF]
, 2010 Through careful consideration of the orbit perturbation force due to the oblate nature of the primary body a secular variation of the ascending node angle of a near-polar orbit can be induced without expulsion of propellant.
Bosquillon de Frescheville, Francois +9 more
core +4 more sources
On-Orbit Manoeuvring Using Superquadric Potential Fields [PDF]
, 2007 On-orbit manoeuvring represents an essential process in many space missions such as orbital assembly, servicing and reconfiguration. A new methodology, based on the potential field method along with superquadric repulsive potentials, is discussed in this
Badawy, Ahmed
core +5 more sources
Rarefied gas effects on the aerodynamics of high area-to-mass ratio spacecraft in orbit [PDF]
, 2013 The aerodynamic situation of a satellite-on-a-chip operating in low Earth orbit bears some resemblance to a classical Crookes radiometer. The large area-to-mass ratio characteristic of a SpaceChip means that very small surface-dependent forces produce ...
White, Craig +4 more
core +4 more sources
On-orbit assembly using superquadric potential fields [PDF]
, 2008 The autonomous on-orbit assembly of a large space structure is presented using a method based on superquadric artificial potential fields. The final configuration of the elements which form the structure is represented as the minimum of some attractive ...
Badawy, Ahmed, McInnes, Colin
core +4 more sources
Biologically Inspired Complete Coverage Path Planning Algorithm Based on Q-Learning
Sensors, 2023 Complete coverage path planning requires that the mobile robot traverse all reachable positions in the environmental map. Aiming at the problems of local optimal path and high path coverage ratio in the complete coverage path planning of the traditional ...
Xiangquan Tan +3 more
doaj +1 more source
Vector Fields and Differential Forms on the Orbit Space of a Proper Action
Axioms, 2021 In this paper, we study differential forms and vector fields on the orbit space of a proper action of a Lie group on a smooth manifold, defining them as multilinear maps on the generators of infinitesimal diffeomorphisms, respectively.
Larry Bates +2 more
doaj +1 more source
Research of Materials and Manufacturing Technology System for On-orbit Manufacturing [PDF]
E3S Web of Conferences, 2023 On-orbit manufacturing is affected by space microgravity, high vacuum, large temperature variation, strong radiation and other environmental factors, which also puts forward new requirements for materials and process methods suitable for on-orbit ...
Jiayong Yan +6 more
doaj +1 more source
Electrochromic orbit control for smart-dust devices [PDF]
, 2012 Recent advances in MEMS (micro electromechanical systems) technology are leading to spacecraft which are the shape and size of computer chips, so-called SpaceChips, or ‘smart dust devices’.
Colombo, Camilla +3 more
core +4 more sources
The hot orbit: Orbital cellulitis
Middle East African Journal of Ophthalmology, 2012 Orbital cellulitis is an uncommon condition previously associated with severe complications. If untreated, orbital cellulitis can be potentially sight and life threatening. It can affect both adults and children but has a greater tendency to occur in the pediatric age group. The infection most commonly originates from sinuses, eyelids or face, retained
Chaudhry, Imtiaz A. +2 more
openaire +3 more sources
Haemangiopericytoma of the orbit [PDF]
Australian and New Zealand Journal of Ophthalmology, 1992 AbstractOrbital haemangiopericytomas are ideally managed by complete surgical excision in the first instance. This is frequently not achieved, because difficulty in making the diagnosis preoperatively results in incisional biopsy and the highly vascular nature of the tumour makes complete excision difficult.
Sullivan, TJ +5 more
openaire +5 more sources