Results 31 to 40 of about 547,861 (372)

The Mean and Scatter of the Velocity Dispersion-Optical Richness Relation for maxBCG Galaxy Clusters [PDF]

, 2007
The distribution of galaxies in position and velocity around the centers of galaxy clusters encodes important information about cluster mass and structure. Using the maxBCG galaxy cluster catalog identified from imaging data obtained in the Sloan Digital
Annis, J., Becker, M. R., Evrard, A., Johnston, D., Koester, B., Lau, E., McKay, T. A., Miller, C., Nichol, R., Rozo, E., Sheldon, E., Wechsler, R. H.   +11 more
core   +4 more sources

Electron velocity distribution function in a plasma with temperature gradient and in the presence of suprathermal electrons: application to incoherent-scatter plasma lines [PDF]

Annales Geophysicae, 1998
The plasma dispersion function and the reduced velocity distribution function are calculated numerically for any arbitrary velocity distribution function with cylindrical symmetry along the magnetic field.
P. Guio, J. Lilensten, W. Kofman, N. Bjørnå   +3 more
doaj   +1 more source

Biases in the estimation of velocity dispersions and dynamical masses for galaxy clusters [PDF]

EPJ Web of Conferences, 2020
Using a set of 73 numerically simulated galaxy clusters, we have characterised the statistical and physical biases for three velocity dispersion and mass estimators, namely biweight, gapper and standard deviation, in the small number of galaxies regime ...
Ferragamo A., Rubiño-Martín J.A., Betancort-Rijo J., Munari E., Sartoris B., Barrena R.   +5 more
doaj   +1 more source

Velocity Dispersions of Massive Quiescent Galaxies from Weak Lensing and Spectroscopy

, 2020
We use MMT spectroscopy and deep Subaru Hyper Suprime-Cam (HSC) imaging to compare the spectroscopic central stellar velocity dispersion of quiescent galaxies with the effective dispersion of the dark matter halo derived from the stacked lensing signal ...
Dell'Antonio, Ian P., Geller, Margaret J., Kawanomoto, Satoshi, Komiyama, Yutaka, Koshida, Shintaro, Miyazaki, Satoshi, Sohn, Jubee, Utsumi, Yousuke, Zahid, Harus J.   +8 more
core   +1 more source

Influence of Physical Parameters of Coal Seam on “Cross” Phenomenon of Rayleigh In-seam Wave Dispersion Curve

Meikuang Anquan, 2020
Dispersion curves of Rayleigh channel waves may have “cross” between the fundamental and first higher order modes either in the phase velocities or in group velocities in the low frequency band.
HE Daxi, ZHU Peimin, SHEN Suishui, CAI Wei, WANG Wengang
doaj   +1 more source

Determining the velocity dispersion of the thick disc [PDF]

Monthly Notices of the Royal Astronomical Society, 2012
We attempt to recover the mean vertical velocity and vertical velocity dispersion as a function of the Galactic height for a sample drawn from a realistic Galaxy distribution function by following the method presented in Moni Bidin et al. (2012). We find that, for the sample size used, the observational error in the velocities is much smaller than the ...
openaire   +4 more sources

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   +3 more sources

Pictures of Blockscale Transport: Effective versus Ensemble Dispersion and Its Uncertainty [PDF]

Adv. Water Resour. 91 (2016), 11-22, 2016
Using a Lagrangian framework, we discuss different conceptualizations of the blockscale dispersion tensor. We distinguish effective and ensemble blockscale dispersion, which measure the impact of subscale velocity fluctuations on solute dispersion. Ensemble dispersion quantifies subscale velocity fluctuations between realizations, which overestimates ...
arxiv   +1 more source

Dynamic fluid transport property of hydraulic fractures and its evaluation using acoustic logging

Petroleum Exploration and Development, 2022
The existing acoustic logging methods for evaluating the hydraulic fracturing effectiveness usually use the fracture density to evaluate the fracture volume, and the results often cannot accurately reflect the actual productivity.
Huanran LI, Xiaoming TANG, Shengqing LI, Yuanda SU   +3 more
doaj  

On the wobbles of phase-velocity dispersion curves

Geophysical Journal International, 2020
SUMMARYTo calculate phase-velocity dispersion curves, we introduce a method which reflects both structural and dynamic effects of wave propagation and interference. Rayleigh-wave fundamental-mode surface waves from the South Atlantic Ocean earthquake of 19 August 2016, M = 7.4, observed at the AlpArray network in Europe are strongly influenced by the ...
Kolinsky P., Bokelmann G., Hetenyi G., Abreu R., Allegretti I., Apoloner M. -T., Aubert C., Besancon S., De Berc M. B., Bokelmann G., Brunel D., Capello M., Carman M., Cavaliere A., Cheze J., Chiarabba C., Clinton J., Cougoulat G., Crawford W. C., Cristiano L., Czifra T., D'Alema E., Danesi S., Daniel R., Dannowski A., Dasovic I., Deschamps A., Dessa J. -X., Doubre C., Egdorf S., Fiket T., Fischer K., Friederich W., Fuchs F., Funke S., Giardini D., Govoni A., Graczer Z., Groschl G., Heimers S., Heit B., Herak D., Herak M., Huber J., Jaric D., Jedlicka P., Jia Y., Jund H., Kissling E., Klingen S., Klotz B., Kolinsky P., Kopp H., Korn M., Kotek J., Kuhne L., Kuk K., Lange D., Loos J., Lovati S., Malengros D., Margheriti L., Maron C., Martin X., Massa M., Mazzarini F., Meier T., Metral L., Molinari I., Moretti M., Nardi A., Pahor J., Paul A., Pequegnat C., Petersen D., Pesaresi D., Piccinini D., Piromallo C., Plenefisch T., Plomerova J., Pondrelli S., Prevolnik S., Racine R., Regnier M., Reiss M., Ritter J., Rumpker G., Salimbeni S., Santulin M., Scherer W., Schippkus S., Schulte-Kortnack D., Sipka V., Solarino S., Spallarossa D., Spieker K., Stipcevic J., Strollo A., Sule B., Szanyi G., Szucs E., Thomas C., Thorwart M., Tilmann F., Ueding S., Vallocchia M., Vecsey L., Voigt R., Wassermann J., Weber Z., Weidle C., Wesztergom V., Weyland G., Wiemer S., Wolf F., Wolyniec D., Zieke T., Zivcic M., Zlebcikova H.   +118 more
openaire   +3 more sources