Results 121 to 130 of about 17,385 (315)
Natural families of periodic orbits
The Astronomical Journal, 1967 Abstract : In reference to any solution of a conservative dynamical system with two degrees of freedom, Hill's equation is generalized to encompass non- necessarily isoenergetic displacements as well as the isoenergetic displacements caused by a variation of a parameter. This new variational equation is made the foundation of a methodical procedure for
Deprit, André, Henrard, Jacques
openaire +2 more sources
CSF Monoamine Metabolites and Cognitive Trajectory in Early Parkinson's Disease
Annals of Clinical and Translational Neurology, EarlyView.ABSTRACT Background Imaging and postmortem studies indicate that abnormalities in monoaminergic neurotransmission contribute to cognitive impairment in Parkinson's disease (PD). However, it remains uncertain if cerebrospinal fluid (CSF) monoamine metabolites can serve as biomarkers of cognitive decline in early PD.
Jing‐Yu Shao +7 more
wiley +1 more source
SPG4 and Dementia: Expanding the Clinical Spectrum
Annals of Clinical and Translational Neurology, EarlyView.ABSTRACT Objective Hereditary spastic paraplegia (HSP) is a group of disorders characterized by progressive spasticity and lower limb weakness, with mutations in SPG4/SPAST being the most common cause. Detailed studies and clinical and molecular comparisons across different populations are missing.
Emanuele Panza +19 more
wiley +1 more source
Universal twinkling exponents for spectral fluctuations associated with mixed chaology [PDF]
, 2000 For systems that are neither fully integrable nor fully chaotic, bifurcations of periodic orbits give rise to semiclassically emergent singularities in the fluctuating part Nfl of the energy-level counting function. The bifurcations dominate the spectral
Keating, J. P. +5 more
core
Relationship Between Neurologic Symptoms and Signs and FMR1 Genotype in Premutation Carriers
Annals of Clinical and Translational Neurology, EarlyView.ABSTRACT Background and Objectives Fragile X‐associated Tremor/Ataxia Syndrome (FXTAS) is the most severe late‐onset condition caused by a premutation in the FMR1 gene, characterized by expanded CGG triplet repeats of 55–200. Clinical presentations of FXTAS, including gait ataxia, kinetic tremor, cognitive decline, and rare Parkinsonism, are linked to ...
Flora Tassone +8 more
wiley +1 more source
Stabilizing periodic orbits above the elliptic plane in the solar sail 3-body problem
, 2008 We consider periodic orbits high above the ecliptic plane in the Elliptic Restricted Three-Body Problem where the third massless body is a solar sail.
Biggs, J.D. +6 more
core
Magnetospheric and auroral activity during the April 18, 2002 sawtooth event. [PDF]
, 2006 We examine the 18 April 2002 sawtooth event. We find that the strong magnetic field dipolarizations observed in association with each tooth are not global in occurrence but are rather confined to the nightside.
Skoug, R. +8 more
core
A Disk-originated 329 Day Quasiperiodic Oscillation in the Seyfert 1 Galaxy J1626+5120
The Astrophysical Journal LettersThe Seyfert 1 galaxy J1626+5120 is estimated to host a 10 ^8 M _⊙ black hole (BH) accreting at Eddington ratio ${\dot{m}}_{\,\rm{Edd}\,}\approx 0.043$ . Its long-term multiband light-curve data show flicker-like variations, but in a well-sampled g -band ...
Litao Zhu +4 more
doaj +1 more source
Annals of Clinical and Translational Neurology, EarlyView.ABSTRACT Objective Considerable efforts have been dedicated to developing effective treatments for post‐stroke executive impairment (PSEI), among which repetitive transcranial magnetic stimulation (rTMS) has shown great potential. This study aimed to investigate the therapeutic effects of high‐frequency rTMS on working memory (WM) and response ...
Mengting Lao +6 more
wiley +1 more source