Results 71 to 80 of about 120,659 (273)
Non-Abrikosov Vortex and Topological Knot in Two-gap Superconductor
, 2006 We establish the existence of topologically stable knot in two-gap superconductor whose topology $\pi_3(S^2)$ is fixed by the Chern-Simon index of the electromagnetic potential.
Pengming Zhang, Y. M. Cho, Y. M. Cho
core +1 more source
Annals of Gastroenterological Surgery, EarlyView.This study analyzed log data from the Japanese hinotori surgical robot to characterize manipulation performed by experienced surgeons in robotic surgery. Compared with less‐experienced surgeons, the experienced group demonstrated shorter task durations, reduced travel distances with the right instrument (Arm3), faster and more dynamically modulated ...
Masaki Saito +11 more
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
Deformation of medium having string structure
Vietnam Journal of Mechanics, 2005 In this paper we constructed a model of plastic deformation of the medium having string structure. The knot theory was used to classify the plastic state.
Trinh Van Khoa
doaj +1 more source
Climate change and perennial crop production: Evidence of yield impact and adaptation in California
American Journal of Agricultural Economics, EarlyView.Abstract Perennial crops are economically important. They contribute to food security, providing essential nutrients that are often lacking in annual crops, and provide additional environmental benefits compared with annual crops. Despite their importance, empirical research on the impacts of climate change and adaptation on perennial crops remains ...
Yuanyuan Wen +2 more
wiley +1 more source
Frontiers in Psychology, 2017 Background: During the third year general surgery clerkship, medical students are required to develop laparoscopic knot-tying skills. Knot-tying skills studies often rely on objective variables (e.g., time, materials used, number of iterations) that lend
Michael S. Dempsey, Douglas F. Kauffman
doaj +1 more source
Nahm sums, quiver A-polynomials and topological recursion
Journal of High Energy Physics, 2020 We consider a large class of q-series that have the structure of Nahm sums, or equivalently motivic generating series for quivers. First, we initiate a systematic analysis and classification of classical and quantum A-polynomials associated to such q ...
Hélder Larraguível +3 more
doaj +1 more source
Alzheimer's Disease Co‐Pathology and Cognitive Impairment in Amyotrophic Lateral Sclerosis
Annals of Neurology, EarlyView.Objectives Amyotrophic lateral sclerosis (ALS) and Alzheimer's disease (AD) share neuropathological features, including tau, amyloid, and TDP‐43 pathology. This study investigated whether AD‐related pathological changes are associated with cognitive impairment ALS. Methods Cerebrospinal fluid (CSF total‐tau, phosphorylated‐tau, beta‐amyloid) and plasma
Elisabeth Kasper +29 more
wiley +1 more source
Illuminating new and known relations between knot invariants
Machine Learning: Science and TechnologyWe automate the process of machine learning correlations between knot invariants. For nearly 200 000 distinct sets of input knot invariants together with an output invariant, we attempt to learn the output invariant by training a neural network on the ...
Jessica Craven +3 more
doaj +1 more source
Wilson loop invariants from WN conformal blocks
Nuclear Physics B, 2015 Knot and link polynomials are topological invariants calculated from the expectation value of loop operators in topological field theories. In 3D Chern–Simons theory, these invariants can be found from crossing and braiding matrices of four-point ...
Oleg Alekseev, Fábio Novaes
doaj +1 more source