Results 121 to 130 of about 3,274,537 (356)
A General Relativistic Rotating Evolutionary Universe
, 2008 We show that when we work with coordinate cosmic time, which is not proper time, Robertson-Walker's metric, includes a possible rotational state of the Universe. An exact formula for the angular speed and the temporal metric coefficient, is found.Comment:
C. Brans +7 more
core +1 more source
Computing center conditions for vector fields with constant angular speed
Journal of Computational and Applied Mathematics, 2003 AbstractWe investigate the planar analytic systems which have a center-focus equilibrium at the origin and whose angular speed is constant. The conditions for the origin to be a center (in fact, an isochronous center) are obtained. Concretely, we find conditions for the existence of a Cw-commutator of the field.
Algaba Durán, Antonio +1 more
openaire +2 more sources
Advanced Engineering Materials, EarlyView.Herein, silicon‐based nanoparticle coatings on X2CrNiMo17‐12‐2 metal powder are presented. The coating process scale, process parameters, nanoparticle size (65–200 nm) as well as the coating amount are discussed regarding powder properties. The surface roughness affects the flowability, while reflectance depends on the coating material and surface ...
Arne Lüddecke +4 more
wiley +1 more source
Duty Cycle-Rotor Angular Speed Reverse Acting Relationship Steady State Analysis Based on a PMSG d–q Transform Modeling [PDF]
, 2022 José Genaro González-Hernández +1 more
openalex +1 more source
Elastic limit angular speed of solid and annular disks under thermomechanical loading
, 2016 In this study, the influence of thermo-mechanical loading on stresses and deformation states in a rotating disk with varying thicknesses has been evaluated based on a variational principle considering the radial displacement field as unknown.
P. Nayak, K. Saha
semanticscholar +1 more source
IEEE transactions on intelligent transportation systems (Print), 2018 Spatial characteristics of the propagation channel have a vital impact on the application of multi-antenna techniques. This paper analyzes angular characteristics and the spatial correlation for high-speed railway (HSR) channels, based on a novel moving ...
Tao Zhou, C. Tao, S. Salous, Liu Liu
semanticscholar +1 more source
Beyond Order: Perspectives on Leveraging Machine Learning for Disordered Materials
Advanced Engineering Materials, EarlyView.This article explores how machine learning (ML) revolutionizes the study and design of disordered materials by uncovering hidden patterns, predicting properties, and optimizing multiscale structures. It highlights key advancements, including generative models, graph neural networks, and hybrid ML‐physics methods, addressing challenges like data ...
Hamidreza Yazdani Sarvestani +4 more
wiley +1 more source
, 2016 Modern aircraft engine designs feature reduced clearances that may initiate structural contacts between rotating and static components. A numerical strategy dedicated to the simulation of such interactions is here enriched in order to account for time ...
Alain Batailly, M. Legrand, C. Pierre
semanticscholar +1 more source
Advanced Engineering Materials, EarlyView.Laser surface texturing significantly improves the corrosion resistance and mechanical strength of 3D‐printed iron polylactic acid (Ir‐PLA) for marine applications. Optimal laser parameters reduce corrosion by 80% and enhance tensile strength by 25% and ductility by 15%.
Mohammad Rezayat +6 more
wiley +1 more source
Inelastic scattering of OH from a liquid PFPE surface: Resolution of correlated speed and angular distributions [PDF]
, 2023 Maksymilian J. Roman +6 more
openalex +1 more source