Neutron
Mostrando 13-24 de 511 artigos, teses e dissertações.
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13. Experimental Analysis of Residual Stresses in Pre-Straightened SAE 1045 Steel
This paper aims at analyzing the effects of the roller pre-straightening of wire-rods on residual stress distributions in SAE 1045 steel bars. The combined drawing process is used in industrial production of bars in order to obtain a good surface quality and improved mechanical properties complying with specifications of the final products. In this process,
Mat. Res.. Publicado em: 24/08/2017
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14. PENETRAÇÃO E DISTRIBUIÇÃO DO CONSOLIDANTE PARALOID® B-72 EM CERÂMICA BRANCA ESTUDADA POR TOMOGRAFIA COM NÊUTRONS
The neutron tomography technique was employed to study the penetration and distribution of the consolidant Paraloid® B-72 in ceramic. This study was carried out in white contemporary ceramic vessels which were maintained in two distinct and controlled air humidity conditions, 35% and 90%, before the consolidant application (brushing technique). The results
Quím. Nova. Publicado em: 2017-08
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15. Evaluation of Major and Trace Elements in Medicinal Plants
This study presents the elemental concentration results obtained from 59 medicinal plants used in Brazil, determined by instrumental neutron activation analysis (INAA), inductively coupled plasma-optical emission spectrometry (ICP OES) and cold vapor atomic absorption spectrometry (CV AAS). The selected plant species were chosen from the Brazilian National A
J. Braz. Chem. Soc.. Publicado em: 2016-12
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16. Finite Element Method with Spectral Green's Function in Slab Geometry for Neutron Diffusion in Multiplying Media and One Energy Group
RESUMO A utilização de centrais nucleares para geração de energia elétrica é uma das principais alternativas para atender a demanda energética nos próximos anos sem agravar os problemas ambientais associados ao aquecimento global. O uso de métodos e técnicas de simulação que estimem a população de nêutrons no núcleo é fundamental para garant
TEMA (São Carlos). Publicado em: 2016-08
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17. Ti-based BCC Alloy: Dehydrogenation Characterization Using Synchrotron and Neutron Diffraction
Dehydrogenation of a BCC alloy of composition 52Ti-12V-36Cr doped with 4 wt.% Zr7Ni10 was studied by diffraction using synchrotron and neutron radiations. In the case of synchrotron radiation dehydrogenation was imposed by raising the temperature while keeping the sample under vacuum. We found that prior to final dehydrogenation the FCC dihydride phase is be
Mat. Res.. Publicado em: 17/05/2016
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18. Clinical assessment of 252Californium neutron intracavitary brachytherapy using a two-channel Y applicator combined with external beam radiotherapy for endometrial cancer
OBJECTIVE: The aim of this study was to determine the efficacy of 252Californium neutron intracavitary brachytherapy using a two-channel Y applicator combined with external beam radiotherapy for the treatment of endometrial cancer. METHODS: Thirty-one patients with stage I-III endometrial cancer were recruited for this study. The stage I patients received
Clinics. Publicado em: 2016-01
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19. Verification of Response of Neutron Monitor for In-Flight Neutron Dosimetry
ABSTRACT: In this work, we present the results of verification of special neutron monitoring equipment for use in aircrew dosimetry inside aircraft. The equipment was precalibrated with conventional neutron sources in a National Standard Laboratory of the Institute for Radioprotection and Dosimetry (IRD, Brazil) and verified in a Cosmic Energy Reference Fiel
J. Aerosp. Technol. Manag.. Publicado em: 2013-09
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20. Biodistribution of meglumine antimoniate in healthy and Leishmania (Leishmania) infantum chagasi-infected BALB/c mice
Pentavalent antimonials such as meglumine antimoniate (MA) are the primary treatments for leishmaniasis, a complex disease caused by protozoan parasites of the genus Leishmania . Despite over 70 years of clinical use, their mechanisms of action, toxicity and pharmacokinetics have not been fully elucidated. Radiotracer studies performed on animals have the po
Mem. Inst. Oswaldo Cruz. Publicado em: 2013-08
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21. Comparison between Neutron Diffraction measurements and numerical simulation of residual stresses of a Wire-Drawing process
In this work, a drawing processed was simulated to calculate forces and the resulting residual stresses in the material. The calculated residual stresses were compared with experimentally measured residual stresses by the Neutron Diffraction Method. The modeled process was the Wire Drawing. The necessary parameters to model the process were taken from an ind
Mat. Res.. Publicado em: 08/02/2013
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22. Estudo sobre determinação de elementos químicos em unhas humanas pelo método de análise por ativação com nêutrons / A study on chemical element determinations in human nails by neutron activation analysis
As análises de unhas têm sido objeto de estudo para avaliar os níveis de elementos acumulados no organismo humano e com aplicações deste tecido na monitoração da exposição ocupacional ou ambiental, na avaliação do estado nutricional, na identificação da intoxicação por metais tóxicos e na diagnose ou prevenção de doenças. As análises de u
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2012
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23. Estudo do campo de radiação neutrônica em torno do cíclotron GE PETtrace-8 de 16,5 MeV do CDTN / Study of the neutron radiation field around the GE-PETtrace-8 cyclotron do CDTN
Os radionuclídeos utilizados na tomografia por emissão de posítrons (PET) são produzidos utilizando um acelerador cíclotron. Os nêutrons produzidos durante a operação do cíclotron contribuem para exposição direta ou indireta dos Indivíduos Ocupacionalmente Expostos (IOEs), devido ao aumento da radiação de fundo da casamata. Além disso, há um
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/07/2012
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24. Estudo sobre a identificação de hádrons em câmaras de fotoemulsão / Study about hadron identification in emulsion chambers
This work introduces the importance of photoemulsion chambers that remain in use after decades and still offer many advantages for elementary particle physics. We cite OPERA (Oscillation Project with Emulsion-tRacking Apparatus) detector that is the greatest lead photoemulsion chamber detector ever constructed as an example of its application nowadays (nine
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/04/2012