Experimental study of a three-dimensional large-scale structure in a reciprocating oscillatory flow

1990 ◽  
Vol 6 (5-6) ◽  
pp. 261-275 ◽  
Author(s):  
Mikio Hino ◽  
Yu Fukunishi ◽  
Yan Meng
Keyword(s):  
Experimental Study ◽  
Large Scale ◽  
Oscillatory Flow ◽  
Three Dimensional ◽  
Large Scale Structure ◽  
Scale Structure

scholarly journals Inferring high-redshift large-scale structure dynamics from the Lyman-α forest

2019 ◽  
Vol 630 ◽  
pp. A151 ◽  
Author(s):  
Natalia Porqueres ◽  
Jens Jasche ◽  
Guilhem Lavaux ◽  
Torsten Enßlin
Keyword(s):  
Large Scale ◽  
High Redshift ◽  
Three Dimensional ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Modal Parameter ◽  
Large Scale Structures ◽  
Quasar Spectra ◽  
Large Scale Flow ◽  
Fully Bayesian

One of the major science goals over the coming decade is to test fundamental physics with probes of the cosmic large-scale structure out to high redshift. Here we present a fully Bayesian approach to infer the three-dimensional cosmic matter distribution and its dynamics at z >  2 from observations of the Lyman-α forest. We demonstrate that the method recovers the unbiased mass distribution and the correct matter power spectrum at all scales. Our method infers the three-dimensional density field from a set of one-dimensional spectra, interpolating the information between the lines of sight. We show that our algorithm provides unbiased mass profiles of clusters, becoming an alternative for estimating cluster masses complementary to weak lensing or X-ray observations. The algorithm employs a Hamiltonian Monte Carlo method to generate realizations of initial and evolved density fields and the three-dimensional large-scale flow, revealing the cosmic dynamics at high redshift. The method correctly handles multi-modal parameter distributions, which allow constraining the physics of the intergalactic medium with high accuracy. We performed several tests using realistic simulated quasar spectra to test and validate our method. Our results show that detailed and physically plausible inference of three-dimensional large-scale structures at high redshift has become feasible.

scholarly journals Erratum: Three-dimensional hydrodynamical simulations of the large-scale structure of W50-SS433

2008 ◽  
Vol 389 (2) ◽  
pp. 1008-1008 ◽  
Author(s):  
Jesús Zavala ◽  
Pablo F. Velázquez ◽  
Adriano H. Cerqueira ◽  
Gloria M. Dubner
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Hydrodynamical Simulations

Three-dimensional simulation of large-scale structure in the Universe

Nature ◽  
1983 ◽  
Vol 305 (5931) ◽  
pp. 196-198 ◽  
Author(s):  
Joan Centrella ◽  
Adrian L. Melott
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Dimensional Simulation ◽  
The Universe

scholarly journals Automatic Three-Dimensional Measurement of Large-Scale Structure Based on Vision Metrology

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Zhaokun Zhu ◽  
Banglei Guan ◽  
Xiaohu Zhang ◽  
Daokui Li ◽  
Qifeng Yu
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Blob Detection ◽  
Three Dimensional Measurement ◽  
Fully Automatic ◽  
Voting Strategy ◽  
Key Techniques

All relevant key techniques involved in photogrammetric vision metrology for fully automatic 3D measurement of large-scale structure are studied. A new kind of coded target consisting of circular retroreflective discs is designed, and corresponding detection and recognition algorithms based on blob detection and clustering are presented. Then a three-stage strategy starting with view clustering is proposed to achieve automatic network orientation. As for matching of noncoded targets, the concept of matching path is proposed, and matches for each noncoded target are found by determination of the optimal matching path, based on a novel voting strategy, among all possible ones. Experiments on a fixed keel of airship have been conducted to verify the effectiveness and measuring accuracy of the proposed methods.

scholarly journals Radio Surveys and Large Scale Structure

1991 ◽  
Vol 44 (6) ◽  
pp. 759 ◽  
Author(s):  
PA Shaver
Keyword(s):  
Radio Source ◽  
Large Scale ◽  
Three Dimensional ◽  
Large Scale Structure ◽  
Radio Galaxies ◽  
Scale Structure ◽  
Radio Sources ◽  
Clusters Of Galaxies ◽  
Normal Galaxies ◽  
Dimensional Distribution

An analysis of the Molonglo Reference Catalogue indicates that significant departures from isotropy are present in the sky distribution of strong extragalactic radio sources. This has been shown to be due to local large scale structure, specifically a concentration to the supergalactic plane, which also influences the slope of the source counts. A study of the three-dimensional distribution of local radio galaxies shows that they are more strongly concentrated to the supergalactic plane than are optically�selected galaxies, and that the supergalactic concentration is more extensive than hitherto believed. It appears that radio galaxies (and clusters of galaxies) trace the 'skeleton' of large scale structure, about which normal galaxies are more loosely distributed. Thus, while large scale structure evidently complicates the interpretation of radio source counts, it appears that radiO surveys can be of value in exploring structures on the largest scales.

Experimental Study on Scale Effects of Bentonite / Sand Mixtures on Gas Migration Properties

1996 ◽  
Vol 465 ◽  
Author(s):  
Toshiyuki Hokari ◽  
Mitsunobu Okihara ◽  
Takashi Ishii ◽  
Takao Ishii ◽  
Hiroyuki Ikuse
Keyword(s):  
Experimental Study ◽  
Laboratory Test ◽  
Large Scale ◽  
Scale Effects ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Gas Migration ◽  
Test Results ◽  
Laboratory Test Results ◽  
Small Test

ABSTRACTGas migration properties of bentonite/sand mixtures for a large-scale structure were estimated on the basis of laboratory test results obtained with small test specimens. Water and gas migration tests were carried out to clarify scale effects on migration properties of the mixtures.

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