Results 161 to 170 of about 73,260 (219)

Impacts of genetic selection on satellite cell function in poultry. [PDF]

Front Physiol
Yimiletey J, Velleman SG, Yu H.
europepmc   +1 more source

Intercomparison case study of data-driven reconstructions of a cloud-obscured Saharan dust plume in Europe. [PDF]

Sci Rep
Kanngießer F, Fiedler S.
europepmc   +1 more source

Enhancement of Hypoxia-Induced Autophagy via the HIF-1apha/BNIP3 Pathway Promotes Proliferation and Myogenic Differentiation of Aged Skeletal Muscle Satellite Cells. [PDF]

Life (Basel)
Zhou L, Feng C, Lin J, Geng M, Qu D, Xing J, Lin H, Ma X, Nakanishi R, Maeshige N, Kondo H, Fujino H.   +11 more
europepmc   +1 more source

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Geometry and control of satellite formations

Proceedings of the 2000 American Control Conference. ACC (IEEE Cat. No.00CH36334), 2000
Satellite formations based on the solutions to Hill's equations have relatively simple geometric shapes. This paper shows that all such formations around a leader satellite in a circular orbit are determined by the intersection of a plane and an elliptic cylinder of eccentricity /spl radic/3/2. In a moving coordinate system fixed to the leader.
Hsi-Han Yeh, Andrew Sparks
openaire   +1 more source

Multi-satellite formation and reconfiguration

Proceedings of the 2000 American Control Conference. ACC (IEEE Cat. No.00CH36334), 2000
This paper addresses the problem of formation and reconfiguration of multiple micro-satellite systems. A control scheme, called the perceptive frame, is adopted which integrates the decentralized feedback of each satellite with online sensor information to achieve the goal of formation keeping and intersatellite coordination.
Wei Kang 0001, Andrew G. Sparks, Siva Banda   +2 more
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Formation Flying Satellites: Control By an Astrodynamicist

Celestial Mechanics and Dynamical Astronomy, 2001
Potential periodic formation orbits can be identified using Hill's equation. However, as gravitational perturbations destroy the periodicity, a control is required to maintain the desired orbits. Here, the authors address the control of individual satellites as well as the control of the whole constellation.
Alfriend, Kyle T., Vadali, Srinivas R., Schaub, Hanspeter   +2 more
openaire   +1 more source

Nonlinear Tracking Control for Satellite Formations

Journal of Guidance, Control, and Dynamics, 2002
A tracking control law using a sliding mode framework is derived to control a satellite formation. Hill's relative motion equations are used to model the follower satellite's motion relative to the leader. To minimize fuel required to maintain the formation, each satellite is constrained to reside near a natural orbit.
Hsi-Han Yeh, Eric Nelson, Andy Sparks
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Control of satellite formations

AIAA Guidance, Navigation, and Control Conference and Exhibit, 2001
This paper develops further a new concept for controlling satellite formations by considering the J2 perturbation. The relative orbits considered here are perturbations of periodic orbits obtained from Hill's equations. A novel, disturbance accommodating control design process is presented for minimizing the total fuel consumption for the formation and
K. Naik, S. Vadali, S. Vaddi, K. Alfriend   +3 more
openaire   +1 more source