Results 31 to 40 of about 2,815 (307)

Stable configurations for bounded satellite formation flying in the presence of gravitational perturbations [PDF]

, 2022
A formation of satellites operating in low Earth orbits is subject to erturbations associated to the nonuniform gravitational field of the Earth, whose entities depend on the position, resulting in a different effect on each satellite of the formation.
Mauro Pontani, Paolo Teofilatto, Stefano Carletta   +2 more
core  

Pattern transition in spacecraft formation flying using bifurcating potential field [PDF]

, 2012
Many new and exciting space mission concepts have developed around spacecraft formation flying, allowing for autonomous distributed systems that can be robust, scalable and flexible.
Derek J. Bennet, Colin R. McInnes, McInnes, Colin, Bennet, Derek James, Bennet, Derek J., McInnes, Colin R.   +5 more
core   +1 more source

Network configuration analysis for formation flying satellites [PDF]

2001 IEEE Aerospace Conference Proceedings (Cat. No.01TH8542), 2002
The performance of two networks to support autonomous multi-spacecraft formation flying systems is presented. Both systems are comprised of a ten-satellite formation, with one of the satellites designated as the central or "mother ship." All data is routed through the mother ship to the terrestrial network.
E.J. Knoblock, T.M. Wallett, V.K. Konangi, K.B. Bhasin   +3 more
openaire   +1 more source

Satellite formation flying control by mass exchange [PDF]

Acta Astronautica, 2014
Abstract Novel approach for formation flying relative motion control is proposed and studied. It is based on a mass exchange between satellites. A certain mass is separated from one satellite in a given direction with a given velocity. It impacts absolutely inelastically another satellite to impart a pulse.
Danil Ivanov, Michael Ovchinnikov, Sergey Shestakov   +2 more
openaire   +1 more source

Passivity-Based Control with Disturbance Observer of Electromagnetic Formation Flight Spacecraft in the Port-Hamiltonian Framework

Applied Sciences
Satellite formation flying technology currently represents a focal point in space mission research. Traditional spacecraft payload performance and lifespan are often constrained by propellant limitations.
Jiaming Wang, Qingrui Zhou, Wei Zheng, Jiang Shao   +3 more
doaj   +1 more source

Clinical, Histopathological, and Molecular Characterization of Pediatric MN1::ZNF341‐Associated Cancer

Pediatric Blood &Cancer, EarlyView.
ABSTRACT A lethal round‐cell malignancy with an MN1::ZNF341 fusion has recently been reported in three infants. Here, we describe four further tumors, three in newborns (including monozygotic twins), and one in an adolescent. Detailed clinical, radiological, and histopathological data differentiate these tumors from their main mimics, neuroblastoma and
Thomas R. W. Oliver, Dyanne Rampling, Barbara Walkowiak, Nathaniel D. Anderson, Manas Dave, Henry Lee‐Six, Sadie Baskind, Pooja Balasubramanian, Glenn Anderson, Conor Parks, Toochi Ogbonnah, Emilia R. Robertson, Simon Hannam, Rohan Verma, John C. Achermann, Liina Palm, Neil Sebire, Thomas Jacques, Tom Watson, Carryl Dryden, Karin Straathof, Mette Jorgensen, Olga Slater, Sam Behjati, Sarita Depani, J. Ciaran Hutchinson   +25 more
wiley   +1 more source

VIGS as a strategy to reverse aphid wing induction by Y‐satellite RNA of cucumber mosaic virus

FEBS Open Bio, 2023
Y‐satellite RNA (Y‐sat) of cucumber mosaic virus upregulates the expression of the aphid ABCG4 gene, which promotes aphid wing formation. We used ABCG4 virus‐induced gene silencing (VIGS) to prevent the wing‐induction mechanism of Y‐sat and thus ...
Hangil Kim, Chikara Masuta
doaj   +1 more source

Time‐restricted feeding prior to Mycobacterium tuberculosis infection reduces tissue CD4+ T cells with limited impact on bacterial clearance

FEBS Open Bio, EarlyView.
Time‐restricted feeding (TRF) in mice increased liver fatty acid oxidation and decreased fatty acid biosynthesis. These alterations persisted when TRF was discontinued and the host was infected with Mycobacterium tuberculosis. Pre‐exposure to TRF did not alter tissue (lung and spleen) mycobacterial burden but significantly reduced CD3+ T cells in lungs
Ashish Gupta, Nidhi Yadav, Subhasmita Das, R. Rajendra Kumar Reddy, Nupur Sharma, Amol Ratnakar Suryawanshi, Jaswinder Singh Maras, Ranjan Kumar Nanda   +7 more
wiley   +1 more source

Optimal on-off cooperative manoeuvers for long-term satellite cluster flight [PDF]

, 2014
When a group of satellites is equipped with a particulary simple propul- sion system, e.g. cold-gas thrusters, constraints on the thrust level and total propellant mass renders cluster-keeping extremely challenging.
Gurfil, Pini, Mazal, Leonel, Mingotti, Giorgio   +2 more
core   +1 more source

Research on Formation of Microsatellite Communication with Genetic Algorithm

The Scientific World Journal, 2013
For the formation of three microsatellites which fly in the same orbit and perform three-dimensional solid mapping for terra, this paper proposes an optimizing design method of space circular formation order based on improved generic algorithm and ...
Guoqiang Wu, Yuguang Bai, Zhaowei Sun
doaj   +1 more source