Results 91 to 100 of about 14,302 (311)

Periodic orbits, superintegrability, and Bertrand’s theorem

AIP Advances, 2020
Periodic orbits are the key for understanding classical Hamiltonian systems. As we show here, they are the clue for understanding Bertrand’s result relating the boundedness, flatness, and periodicity of orbits with the functional form of the potentials ...
R. P. Martínez-y-Romero, H. N. Núñez-Yépez, A. L. Salas-Brito   +2 more
doaj   +1 more source

MiR‐513a promotes human erythroid differentiation by modulating c‐Jun

FEBS Open Bio, EarlyView.
During early human erythropoiesis, miR‐513a promoted erythroid differentiation in primary human CD34+ hematopoietic stem‐progenitor cells and human TF‐1 erythroleukemic cells by indirectly decreasing c‐Jun and phospho‐c‐Jun expression, which are associated with increased GATA1 expression.
MinJung Kim, Brittany Taylor, Shannon Bolten, Christian L. Eberly, Mahliya Abdurahman, T. Michael Creed, Acong Yang, Taylor L. Hatchet, Tristan Dyson, Shuo Gu, Curt I. Civin, Tami J. Kingsbury   +11 more
wiley   +1 more source

Analysis and control of displaced periodic orbits in the Earth-Moon system

, 2009
We consider displaced periodic orbits at linear order in the circular restricted Earth-Moon system, where the third massless body is a solar sail. These highly non-Keplerian orbits are achieved using an extremely small sail acceleration. In this paper we
Simo, J., Simo, Jules, McInnes, Colin R., McInnes, C.R.   +3 more
core  

The numerical computation of connecting orbits in dynamical systems

, 1990
Beyn W-J. The numerical computation of connecting orbits in dynamical systems. IMA Journal of Numerical Analysis. 1990;10(3):379-405.Structural changes in dynamical systems are often related to the appearance or disappearance of orbits connecting two ...
Beyn, Wolf-Jürgen
core   +1 more source

Periodic orbits for an autonomous version of the Duffing–Holmes oscillator

Nonlinear Analysis
In the autonomous Duffing–Holmes oscillator, the existence of periodic orbits was detected numerically. Using the Hopf bifurcation theory, we prove analytically that such periodic orbits exist.
Guangfeng Dong, Jaume Llibre
doaj   +1 more source

Reversible Relative Periodic Orbits

Journal of Differential Equations, 2002
The aim of this paper is to extend recently obtained results [\textit{B. Sandstede}, \textit{A. Scheel} and \textit{C. Wulff}, J. Nonlinear Sci. 9, 349--378 (1999; Zbl 0951.35014); \textit{C. Wulff}, \textit{J. S. W. Lamb} and \textit{I. Melbourne}, Ergodic Theory Dyn. Syst.
Lamb, JSW, Wulff, C
openaire   +3 more sources

Systemic dysregulation of apolipoproteins in amyotrophic lateral sclerosis serum

FEBS Open Bio, EarlyView.
Amyotrophic lateral sclerosis (ALS) is a fatal disease that damages motor neurons. This study found that people with ALS show significant changes in blood fats and the proteins that carry them. Several apolipoproteins were higher, lipid balances were altered, and normal protein–lipid relationships were disrupted.
Finula I. Isik, Russell Pickford, Hannah C. Timmins, Olivier Piguet, Glenda M. Halliday, Matthew C. Kiernan, Woojin Scott Kim   +6 more
wiley   +1 more source

Displaced solar sail orbits : dynamics and applications

, 2010
We consider displaced periodic orbits at linear order in the circular restricted Earth-Moon system, where the third massless body is a solar sail. These highly non-Keplerian orbits are achieved using an extremely small sail acceleration.
Simo, J., Simo, Jules, McInnes, Colin, McInnes, Colin R., McInnes, C.R.   +4 more
core  

Time-delayed feedback control in astrodynamics

, 2009
In this paper we present time-delayed feedback control (TDFC) for the purpose of autonomously driving trajectories of nonlinear systems into periodic orbits.
Biggs, James, BIGGS, JAMES DOUGLAS, McInnes, Colin, Biggs, James D., McInnes, Colin R.   +4 more
core   +1 more source

Molecular dynamics simulations of positively selected codons in FcγRI reveal novel biochemical binding properties

FEBS Open Bio, EarlyView.
Evolutionary analysis across 32 placental mammals identified positive selection at residues H148 and W149 in the immune receptor FcγR1. Ancestral reconstruction combined with molecular dynamics simulations reveals how these mutations may influence receptor structure and dynamics, providing insight into the evolution of antibody recognition and immune ...
David A. Young, Omar Arias‐Gaguancela, Fiona Gibson, Morgan Grainger, Jodie Score, Amit Nathubhai, Mauricio Cafiero, Lee Richard Machado   +7 more
wiley   +1 more source