Vacuum Decay
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Comparative study of inclusion removal from liquid steel in the RH and argon purging processes
Abstract In order to improve steel quality, it is necessary to increase the cleanliness of the liquid steel; that is, to reduce the number and size of the inclusions in the liquid steel, as well as to control their chemical composition. For this purpose, processes (with different operating costs) are used, such as the bubbling of inert gas in the steel ladle
REM, Int. Eng. J.. Publicado em: 2020-09
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2. Desenvolvimento de método para medida de permeabilidade superficial de revestimentos de argamassa. / Development of method for measuring the surface permeability of coating mortar.
The phenomenon of permeability refers to the ability with which a fluid is transported through a porous medium, driven by pressure gradient between the material and the external environment. Degradation agents are conducted to the interior of mortar and concrete driven through such a phenomenon. Therefore, it is the permeability as a key parameters for durab
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/05/2011
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3. Decaimentos de mésons D e DSJ no modelo C3P0
The Fock-Tani representation is a field theory formalism appropriated for the simultaneous treatment of composite particles and their constituents. The 3P0 model is a typical decay model which considers only OZI-allowed strong decays. The model considers a quark-antiquark pair created with the vacuum quantum numbers in the presence of the initial state meson
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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4. Propriedades de madeiras termorretificadas / Properties of thermalrectified wood
Heat treatment applied to the wood leads to the degradation and/or rearrangement of its principal chemical constituents, especially cellulose, hemicelluloses, and lignin, improving some properties such as dimensional stability, resistance to attack by wood decay organisms, and reducing the hygroscopicity. This occurs mainly by the OH groups degradation prese
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/05/2010
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5. Dark Energy and The Accelerating Universe: Conceptual Aspects and Observational Tests / Energia escura e aceleração do Universo: Aspectos conceituais e testes observacionais
In the last decade, the extraordinary progress of the astronomical observations (distances with supernovas, matter and cosmic background radiation (CBR) power spectrum, X-ray surface brightness of galaxy clusters, etc) associated with important theoretical developments turned Cosmology one of the most exciting frontiers of contemporary science. In this thesi
Publicado em: 2010
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6. Buracos negros em universos brana com constante cosmológica / Black holes in brane worlds with cosmological constant
We found classes of static and spherically symmetric black hole solutions on the brane for a vacuum configuration, non-null cosmological constant, embedded into a 5-dimensional asymptotically anti-de Sitter bulk. In the asymptotically de Sitter case, the only solution obtained was the extreme Schwarzschild-de Sitter geometry. In the asymptotically anti-de Si
Publicado em: 2008
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7. Decaimentos de neutrinos induzidos por escalares e aplicações a supernovas / Neutrinos decays via scalars and their applications to supernovas
In this work we study nonradiative decays of Majorona neutrinos, via massless bosons, in vacuum and matter. The considerate couplings between the neutrinos and the bosons were scalar and pseudoscalar. In particular we study the processes n i ® nj + c e n i ® n j + c (where is either scalar or pseudoscalar field). In vacuum, we calculate effective rates in
Publicado em: 2006
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8. Strong limits on the possible decay of the vacuum energy into CDM or CMB photons
We investigate models that suggest that the vacuum energy could decay into cold dark matter (CDM) or into a homogeneous distribution of thermalized cosmic microwave background (CMB) photons. We show that the agreement of the density fluctuation spectra obtained from the CMB and galaxy distribution data puts strong limits on the rate of vacuum energy decay. A
Brazilian Journal of Physics. Publicado em: 2005-12
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9. Ion flux transmission along an insulating duct with an axial magnetic field
An experimental study of the metallic ion flux in a pulsed copper vacuum arc with an annular anode and operated with an axial magnetic field is presented. It is employed an insulating drift duct surrounded by an external coil which generates an axial magnetic field. Operating the arc under vacuum condition, measurements of the ion flux and the plasma potenti
Brazilian Journal of Physics. Publicado em: 2004-12
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10. Topological charge screening and pseudoscalar glueballs
Topological charge screening in the QCD vacuum is found to provide crucial nonperturbative contributions to the short-distance expansion of the pseudoscalar (0-+) glueball correlator. The screening contributions enter the Wilson coefficients and are an indispensable complement to the direct instanton contributions. They restore consistency with the anomalous
Brazilian Journal of Physics. Publicado em: 2004-09
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11. Nonsense-mediated mRNA decay: from vacuum cleaner to Swiss army knife
Two new approaches have identified physiological nonsense-mediated mRNA decay (NMD) substrates, and suggest that NMD functions as a multipurpose tool in the modulation of gene expression.
BioMed Central.
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12. γ-irradiation of PEGd,lPLA and PEG-PLGA Multiblock Copolymers: II. Effect of Oxygen and EPR Investigation
The purpose of this research was to evaluate how the presence of oxygen can affect irradiation-induced degradation reactions of PEGd,lPLA and PEG-PLGA multiblock copolymers submitted to gamma irradiation and to investigate the radiolytic behavior of the polymers. PEGd,lPLA, PEG-PLGA, PLA, and PLGA were irradiated by using a 60Co irradiation source in air and
Springer US.