Results 31 to 40 of about 10,858,201 (300)
ChandraObservations of Low Velocity Dispersion Groups [PDF]
The Astrophysical Journal, 2005 Deviations of galaxy groups from cluster scaling relations can be understood in terms of an excess of entropy in groups. The main effect of this excess is to reduce the density and thus luminosity of the intragroup gas. Given this, groups should also should show a steep relationship between X-ray luminosity and velocity dispersion.
Helsdon, Stephen F. +2 more
openaire +2 more sources
Group refractive index and group velocity dispersion measurement by complex master slave interferometry [PDF]
, 2018 This paper demonstrates that the complex master slave interferometry (CMSI) method used in spectral domain interferometry (SDI) can efficiently be used for accurate refractive index and group velocity dispersion measurements of optically transparent ...
Bairstow, Fiona +5 more
core +1 more source
Numerical Simulation of Three-Core Photonic Crystal Fiber With Large Group-Velocity Dispersion
IEEE Access, 2020 The three-core photonic crystal fiber (TC-PCF) is proposed to obtain large group-velocity dispersion (GVD) because of the coupling effects between the fundamental modes (FMs) of the central core and higher-order modes (HOMs) of the two side cores.
Jianfang Yang +3 more
doaj +1 more source
Group velocity of dielectric waveguide modes [PDF]
, 1968 The group velocity and dispersion of surface-wave nodes propagating along a circular dielectric rod are computed and presented graphically in normalised form.
Laybourn, P.J.R.
core +1 more source
Remote Sensing, 2019 The wavenumber-frequency spectra of many radar measurements of the sea surface contain a linear feature at frequencies lower than the first order dispersion relationship commonly referred to as the “group line”.
Andrew J. Kammerer, Erin E. Hackett
doaj +1 more source
Strong group-velocity dispersion compensation with phase-engineered sheet metamaterials
, 2014 Resonant metamaterials usually exhibit substantial dispersion, which is considered a shortcoming for many applications. Here we take advantage of the ability to tailor the dispersive response of a metamaterial, introducing a new method of group-velocity ...
Dastmalchi, B. +8 more
core +1 more source
Parametric study of the behaviour of group velocity dispersion in optical pulse compression [PDF]
, 1992 An optical pulse compressor is investigated over a large range of compression factors, fiber lengths and laser powers. The given theory for zero group velocity dispersion is valid over the investigated range of grating-prism distances.
Ernst, G.J., Mols, R.F.X.A.M.
core +1 more source
JGEUnderstanding of Earth's subsurface is crucial for mitigating geological hazards, particularly earthquakes. A key parameter for subsurface characterization is the surface wave dispersion curve, which strongly reflects shear wave velocity (Vs) at various ...
Muhammad Fachrul Rozi Kurniawan +2 more
doaj +1 more source
Identification of microstructured materials by phase and group velocities
Mathematical Modelling and Analysis, 2009 An inverse problem to determine parameters of microstructured solids by means of group and phase velocities of wave packets is studied. It is proved that in the case of normal dispersion the physical solution is unique and in the case of anomalous ...
Jaan Janno, Jüri Engelbrecht
doaj +1 more source
Applied Sciences, 2021 Guided waves have immense potential for structural health monitoring applications in numerous industries including aerospace. It is necessary to evaluate guided wave dispersion characteristics, i.e., group velocity and phase velocity profiles, for using ...
Muhammad Khalid Malik +2 more
doaj +1 more source