Results 11 to 20 of about 440 (138)
Neuromodulation: Technology at the Neural Interface, EarlyView., 2021 Abstract Background Posttraumatic stress disorder (PTSD) is associated with autonomic dysfunction as indicated by deficits in the sympathetic and parasympathetic nervous systems. These abnormalities are expressed as elevated heart rate and reduced heart rate variability (HRV), respectively.
Camila Cosmo +4 more
wiley +1 more source
On the Proper Treatment of Dynamics in Cognitive Science
Topics in Cognitive Science, EarlyView., 2023 Abstract This essay examines the relevance of dynamical ideas for cognitive science. On its own, the mere mathematical idea of a dynamical system is too weak to serve as a scientific theory of anything, and dynamical approaches within cognitive science are too rich and varied to be subsumed under a single “dynamical hypothesis.” Instead, after first ...
Randall D. Beer
wiley +1 more source
Graphs and projective plaines in 3-manifolds
International Journal of Mathematics and Mathematical Sciences, 1986 Proper homotopy equivalent compact P2-irreducible and sufficiently large 3-manifolds are homemorphic. The result is not known for irreducible 3-manifolds that contain 2-sided projective planes, even if one assumes the Poincaré conjecture.
Wolfgang Heil, Seiya Negami
doaj +1 more source
UniverseIf spacetime is a physical object, it is conceivable that it loses its integrity or is destroyed in some way as a continuum in an abrupt process initiated in spacetime itself.
Jerzy Król, Torsten Asselmeyer-Maluga
doaj +1 more source
Massive AdS supergravitons and holography
Journal of High Energy Physics, 2019 I compare two holographic mechanisms giving to the graviton a parametrically-small supersymmetric mass m g in Anti-de Sitter spacetime. In the context of bimetric gravity these mechanisms couple ‘weakly’ two initially decoupled superconformal theories by:
Constantin Bachas
doaj +1 more source
Maximal multiplicity of the line at infinity in a sextic polynomial differential system
Acta et Commentationes: Ştiinţe Exacte şi ale NaturiiWe investigate planar polynomial differential systems of degree six having an invariant straight line at infinity with high algebraic multiplicity in the sense of the Poincaré compactification.
Vadim Repeșco
doaj +1 more source
Space-Time Defects and Group Momentum Space
Advances in High Energy Physics, 2017 We study massive and massless conical defects in Minkowski and de Sitter spaces in various space-time dimensions. The energy momentum of a defect, considered as an (extended) relativistic object, is completely characterized by the holonomy of the ...
Michele Arzano, Tomasz Trześniewski
doaj +1 more source
Ciência & Educação, 2004 Este trabalho descreve as pesquisas realizadas por Henri Becquerel e por Silvanus Thompson, em 1897, que são normalmente descritas como representando a descoberta da radioatividade.
Roberto de Andrade Martins
doaj +1 more source
Asymmetry in Skipping Enhances Viability Against Control Input Noise
Advanced Robotics Research, EarlyView.Quadruped animals use asymmetric galloping gaits at high speeds, yet the functional role of this asymmetry remains unclear. This study shows that left–right asymmetry in touchdown angles enhances robustness to control noise. Using a simple two‐legged locomotion model and viability theory, it demonstrates that asymmetric skipping substantially enlarges ...
Yuichi Ambe, Alvin So, Shinya Aoi
wiley +1 more source
Searching for ribbons with machine learning
Machine Learning: Science and TechnologyWe apply Bayesian optimization and reinforcement learning to a problem in topology: the question of when a knot bounds a ribbon disk. This question is relevant in an approach to disproving the four-dimensional smooth Poincaré conjecture; using our ...
Sergei Gukov +3 more
doaj +1 more source