Results 101 to 110 of about 2,299,265 (280)
Archives of Metallurgy and Materials, 2016 Rolling friction representing the energy dissipation mechanism with the elastic deformation at the contact point could act directly on particle percolation.
Zhou Heng +5 more
doaj +1 more source
Velocity Dispersions of Brightest Cluster Galaxies and Their Host Clusters [PDF]
, 2019 We explore connections between brightest cluster galaxies (BCGs) and their host clusters. We first construct a HeCS-omnibus cluster sample including 227 galaxy clusters within $0.02 < z < 0.30$; the total number of spectroscopic members from MMT/Hectospec and SDSS observations is 52325.
arxiv +1 more source
The velocity dispersion and mass function of the outer halo globular cluster Palomar 4 [PDF]
, 2012 We obtained precise line-of-sight radial velocities of 23 member stars of the remote halo globular cluster Palomar 4 (Pal 4) using the High Resolution Echelle Spectrograph (HIRES) at the Keck I telescope. We also measured the mass function of the cluster
M. Frank +7 more
semanticscholar +1 more source
Einstein on the Impossibility of Superluminal Velocities [PDF]
arXiv, 2012 In 1907 Einstein discussed with Wilhelm Wien the occurrences of superluminal velocities in dispersive and absorptive media. Einstein tried to present to Wien an expression for the group velocity in dispersive media that was based on his 1905 relativistic addition theorem for velocities, which he claimed to be valid for absorptive media, and to ...
arxiv
International Journal of Geophysics, 2020 This work assesses the feasibility of the direct use of surface-wave dispersion curves from seismic ambient noise to gain insight into the crustal structure of Bransfield Strait and detect seasonal seismic velocity changes. We cross-correlated four years
K. Muhumuza
doaj +1 more source
Calibrating stellar velocity dispersions based on spatially-resolved h-band spectra for improving the m-sigma relation [PDF]
, 2013 To calibrate stellar velocity dispersion measurements from optical and near-IR stellar lines, and to improve the black hole mass (MBH)- stellar velocity dispersion (sigma) relation, we measure stellar velocity dispersions based on high quality H-band spectra for a sample of 31 nearby galaxies, for which dynamical MBH is available in the literature.
arxiv +1 more source
Results in Optics, 2023 In this paper we experimentally demonstrate a femtosecond all-polarization- maintaining laser amplifier in an all-fiber scheme, which consists of a mode-locked oscillator and a two-stage amplifier.
Kuo Meng +3 more
doaj
THE COSMOLOGICAL SIZE AND VELOCITY DISPERSION EVOLUTION OF MASSIVE EARLY-TYPE GALAXIES [PDF]
, 2011 We analyze 40 cosmological re-simulations of individual massive galaxies with present-day stellar masses of M* > 6.3 × 1010 M☉ in order to investigate the physical origin of the observed strong increase in galaxy sizes and the decrease of the stellar ...
L. Oser +3 more
semanticscholar +1 more source
Tight gas detection based on the reflectivity dispersion technology
Petroleum Exploration and Development, 2014 The study focuses on the reflectivity dispersion caused by velocity dispersion related to pore fluid and its application to identify tight gas reservoirs.
Zhifang YANG +3 more
doaj
What drives the evolution of gas kinematics in star-forming galaxies? [PDF]
, 2018 One important result from recent large integral field spectrograph (IFS) surveys is that the intrinsic velocity dispersion of galaxies traced by star-forming gas increases with redshift. Massive, rotation-dominated discs are already in place at z~2, but they are dynamically hotter than spiral galaxies in the local Universe.
arxiv +1 more source