نتایج جستجو برای: zw factorizatio
تعداد نتایج: 724 فیلتر نتایج به سال:
We show that the difference between the Ar and Si relative abundance ratio derived from FUSE absorption spectra and from the H ii regions of I Zw 18 is a consequence of the microturbulent analysis applied to the absorption spectra. FUSE observations were performed with a large entrance aperture which fully covered the galaxy. This means that the observed profiles are averaged over the full body...
So far all relativistically boosted jets with superluminal motion have only been detected in typical radio galaxies with early type host galaxies. We have now discovered superluminal motion in the Seyfert I galaxy III Zw 2, classified as a spiral. Superluminal motion was first inferred from the spectral evolution of the source and then confirmed by VLBI observations. The lower limit for the app...
The cytoadhesin family consists of platelet glycoprotein (GP) lIb-Illa and the endothelial vitronectin receptor. The $ subunit (GP lIla) of these complexes expresses the alloantigen Zw (or Pl ). This alloantigen is not expressed by members of other integrin subfamilies. By using immunoprecipitation and immunoblot techniques. we found that the /9 subunit of a heterodimer. expressed by cultured h...
We present results from new deep HST/ACS photometry of I Zw 18, the most metalpoor blue compact dwarf galaxy in the nearby universe. It has been previously argued that this is a very young system that started forming stars only . 500 Myr ago, but other work has hinted that older (& 1 Gyr) red giant branch (RGB) stars may exist in this galaxy. Our deeper data indeed reveal evidence for an RGB. U...
Humans, mice, and even kangaroos have an XX female:XY male system of sex determination, in which the Y harbors a male-dominant sex-determining gene SRY. Birds have the opposite, ZZ males and ZW females, and may use a dosage-sensitive Z-borne gene. Other reptiles have genetic sex but no visible sex chromosomes, or determine sex by temperature of egg incubation. How can we make sense of so much v...
Search for the production of ZW and ZZ boson pairs decaying into charged leptons and jets in p[bar over p] collisions at s = 1.96TeV. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Y...
What is sex determination? Sex determination is the mechanism by which sexual organisms direct gonad development towards distinct but reproductively compatible outcomes. Molecular signaling cascades in the developing gonad provide instructions to the tissue to develop as male or female (or in some cases hermaphrodite), and these signals can be initiated in different ways. Sex can be determined ...
In this paper fast algorithms for the solution of systems Tu = b with a strongly nonsingular hermitian Toeplitz coefficient matrix T via different kinds of factorizations of the matrix T are discussed. The first aim is to show that ZW-factorization of T is more efficient than the corresponding LU-factorization. The second aim is to design and compare different Schurtype algorithms for LUand ZW-...
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