نتایج جستجو برای: firas al
تعداد نتایج: 443135 فیلتر نتایج به سال:
One still cannot conclusively assert that the universe underwent a neutral phase, despite the new COBE FIRAS limit y < 2:5 10 ?5 on Compton y-distortions of the cosmic microwave background. Although scenarios where the very early (z 1; 000) ionization is thermal, caused by IGM temperatures exceeding 10 4 K, are clearly ruled out, there is a signiicant loophole for cosmologies with typical CDM p...
The photometric errors of the external calibrator for the FIRAS instrument on the COBE are smaller than the measurement errors on the cosmic microwave background (CMBR) spectrum (typically 0.02 MJy/sr, 1 σ), and smaller than 0.01% of the peak brightness of the CMBR. The calibrator is a re-entrant cone, shaped like a trumpet mute, made of Eccosorb iron-loaded epoxy. It fills the entire beam of t...
The mean sky-averaged Comptonization parameter, y, describing the scattering of the CMBby hot gas in clusters of galaxies is calculated in an array of flat and open cosmological and dark matter models. The models are globally normalized to fit cluster X-ray data, and intracluster gas is assumed to have evolved in a manner consistent with current observations. We predict values of y lower than t...
In the expanding near Universe where ≈ 50 % of the matter is clumped into galaxies and their halos, it was known from an earlier work that the angular magnification of a large CMB emission feature depends on the statistical balance between light beam convergence by clumps and divergence within the voids for the majority of the sightlines to the feature. The total flux, however, reflects this ba...
We discuss two new observational techniques that use observations of the Cosmic Microwave Background (CMB) to place constraints upon the mass, distance, and size distribution of small objects in the Kuiper Belt and inner Oort Cloud, collectively known as Trans-Neptunian Objects (TNOs). The first new technique considers the spectral distortion of the isotropic, or monopole, CMB by TNOs that have...
Firas A. Jassim Faculty of Administrative Sciences Management Information Systems Department Irbid National University Irbid, 2600, Jordan [email protected] Abstract Image compression is an important filed in image processing. The science welcomes any tinny contribution that may increase the compression ratio by whichever insignificant percentage. Therefore, the essential contribution in this...
We have deduced the cosmic microwave background (CMB) temperature in the Coma cluster (A1656, z = 0.0231), and in A2163 (z = 0.203) from spectral measurements of the Sunyaev-Zel’dovich (SZ) effect over four passbands at radio and microwave frequencies. The resulting temperatures at these redshifts are TComa = 2.789 +0.080 −0.065 K and TA2163 = 3.377 +0.101 −0.102 K, respectively. These values c...
Ammar Al-Chalabi, Peter M. Andersen, Siddharthan Chandran, Adriano Chio, Philippe Corcia, Philippe Couratier, Olof Danielsson, Mamede de Carvalho, Claude Desnuelle, Torsten Grehl, Julian Grosskreutz, Trygve Holmøy, Caroline Ingre, Merete Karlsborg, Grethe Kleveland, Jan Christoph Koch, Blaz Koritnik, Magdalena KuzmaKozakiewicz, Hannu Laaksovirta, Albert Ludolph, Christopher McDermott, Thomas Me...
Structures of new antifungal antibiotics, benanomicins A and B were determined to be N-[[5-[6-deoxy-3-O-(beta-D-xylopyranosyl)-beta-D-galactopyranosyloxy+ ++ ]-5, 6-dihydro-1,6,9,14-tetrahydroxy-11-methoxy-3-methyl-8,13-dioxobenzo++ + [a]naphthacen-2-yl]carbonyl]-D-alanine and N-[[5-[4-amino-4,6-dideoxy-3-O-(beta-D-xylopyranosyl)-beta-D- galactopyranosyloxy]-5,6-dihydro-1,6,9,14-tetrahydroxy-...
9 Country Comparisons of Human Stroke Research Since 2001 A Bibliometric Study Kjell Asplund, MD; Marie Eriksson, PhD; Olle Persson, PhD (Stroke. 2012;43:830-837.)
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