Spallation
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Effect of blisters and rims on radial hydride precipitation in fuel elements under dry storage conditions
ABSTRACT Hydrogen enters in Zry clads during fuel element life in service; when hydrogen exceeds the terminal solid solubility, circumferential hydrides are precipitated. In the presence of thermal gradients, produced for instance by oxide spallation, localized concentration of hydrides - known as blisters - can be formed. Due to the fact that zirconium hydr
Matéria (Rio J.). Publicado em: 19/07/2018
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2. Surface contact fatigue failure of a case hardened pinion shaft
An investigation was made to determine the causes of surface contact fatigue failure of a case hardened driver pinion located in the intermediate shaft of a reducer gearbox used in a sugar and alcohol mill. The examination of the component revealed the presence of a cemented layer substantially thicker than that generally specified for pinions devised for th
Mat. Res.. Publicado em: 20/05/2014
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3. Reações nucleares de alta energia (" Spallation") e sua aplicação em cálculo de sistemas nucleares acionados por Fonte / High energy nuclear reactions ("Spallation") and their application in calculation of the acceleration driven systems (ADS)
Neste trabalho apresentamos um estudo das reações nucleares de alta energia que são fundamentais na definição do termo fonte dos reatores nucleares subcríticos acionados por fonte externa. Estas reações nucleares, também conhecidas como "spallation", consistem na interação de hádrons de alta energia com os núcleons do núcleo atômico. A fenomen
Publicado em: 2011
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4. Neutron production evaluation from a ADS target utilizing the MCNPX 2.6.0 code
Accelerators Driven Systems (ADS) are an innovative type of nuclear system, which is useful for long-lived fission product transmutation and fuel regeneration. The ADS consist of a coupling of a sub-critical nuclear core reactor and a proton beam produced by particle accelerator. These particles are injected into a target for the neutrons production by spall
Brazilian Journal of Physics. Publicado em: 2010-12
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5. NUMERICAL STUDY OF THE INTERACTION BETWEEN A SUPERSONIC JET AND PLANAR SURFACE / ESTUDO NUMÉRICO DA INTERAÇÃO ENTRE UM JATO SUPERSÔNICO E UMA SUPERFÍCIE PLANA
I in this work a study of the interaction between a supersonic jet and a planar surface is presented, with the aim to analyze the behavior of the velocity, pressure and temperature flowfield. This study finds its motivation in the process of thermal spallation of hard rocks, which may result from the interaction between a high pressure and high temperature j
Publicado em: 2008
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6. Estudo, proposta e previsão de desempenho de um filtro de energia para experimentos com alta resolução de comprimento de onda em fontes pulsantes de nêutrons
Em fontes de nêutrons por spallation para pesquisa de materiais, o comprimento de onda dos nêutrons é geralmente determinado pelos tempos de percurso (TOF) dos nêutrons desde a fonte até o detector. A precisão atingível é limitada pelo fato de o tempo de emissão do pulso característico do sistema alvo/moderador ser diferente de zero (a situação i
Publicado em: 2007
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7. The utilization of crisp code in hybrid reactor studies
One of the main applications of the Hybrid Reactors (ADS - Accelerator Driven System) is the incineration of transuranics (TRU) by fast neutrons that emerge from a spallation source in a sub critical reactor waste burner [1, 2]. For this application, an accurate description and prediction of spallation reaction is necessary, including all the characteristics
Brazilian Journal of Physics. Publicado em: 2005-09
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8. Spallation physics and the ADS target design
This paper reviews the physics of the spallation which is a nuclear reaction in which a particle (e.g. proton) interacts with a nucleus. Given to the high energy of the incident proton, in a first stage it interacts with the individual nucleons in an intranuclear cascade which leads to the emission of secondary particles (neutrons, protons, mesons, etc.). In
Brazilian Journal of Physics. Publicado em: 2005-09
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9. Developement of crisp package for spallation reaction studies and its utilization in ADS (Accelerator Driven System)
The progress of nuclear physics had allowed a better understanding of nuclear structure and reaction mechanisms, but also enables important applications of nuclear energy in our modern way of life. We can point out those ones related to power generation from nuclear reactors, providing an almost inexhaustive power source due to the huge quantities of nuclear
Brazilian Journal of Physics. Publicado em: 2004-09
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10. Stress and adhesion of chromia-rich scales on ferritic stainless steels in relation with spallation
The relation between chromia scale spallation during oxidation or cooling down of ferritic stainless steels is generally discussed in terms of mechanical stresses induced by volume changes or differential thermal expansion. In the present paper, growth and thermal stress measurements in scales grown on different ferritic steel grades have shown that the main
Materials Research. Publicado em: 2004-03
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11. Oxidation - Nitridation of Ni-Cr-Al alloys
A series of alloys containing 24-36 wt pct Cr and 13.5 - 25.0 wt pct Al was reacted with air at 1100°C for 260 h. The products of isothermal reaction were scales of a-Al2O3 plus small amounts of Cr2O3. These grew according to parabolic kinetics, interrupted by episodic weight losses caused by partial spallation. No nitridation occurred during the isothermal
Materials Research. Publicado em: 2004-03
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12. Duplex Al-based thermal spray coatings for corrosion protection in high temperature refinery applications
The application of thermal spray coatings has been effective in preventing corrosion of steel and iron products. It has been used in a wide range of applications spreading from the petroleum to the food industry. In this work, the performance and effectiveness of a two-layered aluminum-based thermal spray coating applied to an ASTM A387 G11 steel was evaluat
Materials Research. Publicado em: 2004-03