Gamma Spectra
Mostrando 1-12 de 84 artigos, teses e dissertações.
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1. Gamma irradiation effects on polycaprolactone/zinc oxide nanocomposite films
Abstract Polycaprolactone (PCL) to which has been added zinc oxide nanoparticles (ZnO NPs) produces nanocomposites (PCL/ZnO NCs). These nanocomposites can be used in biomedical applications and in the food packaging sector. However, for these materials to be used in these applications, they need to be sterilized. For this, gamma irradiation is the most comm
Polímeros. Publicado em: 21/03/2019
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2. FTIR study of aquamarines after gamma irradiation, heat treatment and electrodiffusion
Abstract Beryl, Be3Al2(SiO3)6, is a natural gemstone with many colors. Some of these colors can be induced or modified by exposure to ionizing radiation, by heating, and maybe by electrodiffusion. Small contents of chromophore chemical elements are related to the colors of beryl, like iron, chromium, vanadium, manganese, and others. There is great interest i
REM, Int. Eng. J.. Publicado em: 2017-09
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3. Dating stalagmite from Caverna do Diabo (Devil´S Cave) by TL and EPR techniques
ABSTRACT A cylindrical fragment of stalagmite from Caverna do Diabo, State of São Paulo, Brazil, has been studied and dated by thermoluminescence and electron paramagnetic resonance techniques. The thermoluminescence glow curves of stalagmite samples and subsequently gamma irradiated, have shown rise of three peaks at 135, 180 and 265 °C. From electron par
An. Acad. Bras. Ciênc.. Publicado em: 2016-12
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4. New insights into the structural characteristics of irradiated crotamine
Abstract Background: Since ionizing radiation has the potential to alter the molecular structure and affect the biologica properties of biomolecules, it has been successfully employed to attenuate animal toxins. The present study aimed to characterize the structural modifications on irradiated crotamine, a toxin from
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 11/08/2015
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5. Use of Lead (II) Sulfide Nanoparticles as Stabilizer for PMMA Exposed to Gamma Irradiation
Lead (II) sulfide (PbS) were synthesized by sonochemical method and crystals with cubic structure exhibit aggregated nanoparticles with size in the range of 50-100 nm. Commercial Poly(methyl methacrylate) (PMMA) containing the PbS nanoparticles (PbS-NP) exposed to gamma irradiation were investigated and both the viscosity-average molar mass (Mv) and degradat
Mat. Res.. Publicado em: 2015-04
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6. Evaluation of the scattered radiation components produced in a gamma camera using Monte Carlo method
INTRODUCTION: This paper presents a simulation for evaluation of the scattered radiation components produced in a gamma camera PARK using Monte Carlo code SIMIND. It simulates a whole body study with MDP (Methylene Diphosphonate) radiopharmaceutical based on Zubal anthropomorphic phantom, with some spinal lesions. METHODS: The simulation was done by comparin
Rev. Bras. Eng. Bioméd.. Publicado em: 2014-06
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7. Transposição e fragmentação do Rio Piumhi (Bacia do Rio São Francisco, MG): variáveis limnológicas e microcrustáceos zooplanctônicos da Lagoa dos Tropeiros
The aim of this study was to analyse the physical and chemical characteristics of Tropeiros Lake (Capitólio, MG), located in Piumhi river sub‐basin, a river diverted from the Rio Grande basin to the são Francisco River basin, and to analize the taxonomic composition, abundance, diversity and the size structure of the planktonic microcrustaceans. Phys
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/06/2011
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8. STUDY OF BINARY COMPLEXES OF ALUMINUM(III) WITH SULFUR AMINO ACIDS AND PHOSPHATE LIGANDS / ESTUDO DE COMPLEXOS BINÁRIOS DE ALUMÍNIO(III) COM AMINOÁCIDOS SULFURADOS E LIGANTES FOSFATADOS
The study of binary complexes of Al(III) with sulfur amino acids (methionine, cysteine, homocysteine and penicillamine) and phosphate ligands (adenosine 5 - triphosphate and phosphocreatine) was done in aqueous solution applying potentiometric titrations, (13)C and (27)Al NMR, Raman spectroscopy, molecular modeling and DFT: B3LYP/6-311G theoretical calculati
Publicado em: 2010
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9. Calibrando a microfísica de nuvens do modelo RAMS a partir dos dados coletados pelo ALPA. / Calibrating the cloud microphysics of the RAMS model from data collected by ALPA.
This work presents curve fittings for observed cloud droplet spectra as well as sensitivity tests to cloud microphysics parameters in RAMS 6.0 model, in order to attain a better configuration of this model for use in the state of Ceará. The methodology is based on comparisons between model results and observations collected during the ―Cloud Microphys
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/12/2009
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10. A comparison between channel selections in heavy ion reactions
The gamma rays de-exciting the yrast and near yrast states in neutron deficient as well as neutron rich nuclei from fusion-evaporation and deep-inelastic reactions and other emission particles have been recorded using an array of escape suppressed germanium detectors, a BGO ball, a recoil separator, silicon charge particle detectors and an ionization chamber
Brazilian Journal of Physics. Publicado em: 2009-03
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11. Efeito da radiação gama sobre a viscosidade de soluções de gelatina e pectina utilizadas na indústria de alimentos / Effect of gamma irradiation in the viscosity of gelatin and pectin solutions used in food industry
A pectina é uma substância polissacarídica originada de plantas, que pode ser utilizada como agente gelificante, estabilizante de compotas, em bebidas láticas e iogurtes. A gelatina, proteína, nesse caso de origem bovina, é principalmente utilizada como agente gelificante, pois, forma hidrogéis por resfriamento. O processo de irradiação por radiaç�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2008
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12. DEVELOPMENT OF A GAMMA RAY SPECTROMETRY SOFTWARE FOR NEUTRON ACTIVATION ANALYSIS USING THE OPEN SOURCE CONCEP / Desenvolvimento de um software de espectrometria gama para análise por ativação com nêutrons utilizando o conceito de código livre
This study developed a specific software for gamma ray spectra analysis for researchers of the Neutron Activation Laboratory (LAN), which was named SAANI (Instrumental Neutron Activation Analysis Software). The LAN laboratory of the Institute for Research and Nuclear Energy (IPEN-CNEN/SP), uses a multielementar analytical technique, based on irradiation of a
Publicado em: 2008