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2
Termoluminescencia da calcita induzida por radiacao gama e ultravioleta. (Thermoluminescent of induced calcite by gamma and ultraviolet radiation).
1987-01-01

Samples of brazilian calcite, exposed to gamma radiation in laboratory and heated at constant rate of 2.7(sup 0) C/s, showed three glow peaks at 150, 250 and 350 (sup 0)C in their thermoluminescent emission curves. The analysis of these peaks, using diffe...

National Technical Information Service (NTIS)

3
Processo alternativo de vulcanizacao do latex de borracha natural induzida por radiacao ionizante. (Alternative vulcanization process of natural rubber latex induced by ionizing radiation).
1991-01-01

The natural rubber latex was vulcanized by two different process: (a) thermal process in the presence of sulfur; (b) alternative process using radiation (gamma rays and electrons beam). The comparative study of rubber goods quality (surgical gloves and ba...

National Technical Information Service (NTIS)

4
Influencia do sensibilizador radiolitico na vulcanizacao do latex de borracha natural induzida por radiacao ionizante. (Influence of radiolytic sensitizers in natural rubber latex vulcanization induced by ionizing radiation).
1991-01-01

This work made on radiation vulcanization of natural rubber latex process by gamma rays from (sup 60) Co source and electron beam of 1.5 MeV, 25 m A by Dynamitron, instead of classic process using sulfur. The experiment was carried out to study the influe...

National Technical Information Service (NTIS)

5
Estudo de possiveis alteracoes agroindustriais induzidas pelo metodo de cultura de tecido irradiado em cana-de-acucar variedade NA 56-79. (Study of the agroindustrial alterations induced by the irradiated tissue culture in sugar cane, variety NA 56-79).
1991-01-01

The use of plant tissue culture and the application of gamma radiation as mutation inducing agents, in the sugar cane plant, variety NA 5679, are studied. The variation in the contents of brix, pol, fiber, purity, extraction, phosphorus, nitrogen, reducin...

National Technical Information Service (NTIS)

7
Dependencia do grau de cristalinidade com a graftizacao induzida por radiacao gama da N,N(sup ') - dimetilacrilamida em polietileno. (Dependence of crystallinity degree with induced grafting by gamma radiation of N,N(sup ')-dimethyl acrylamide).
1991-01-01

N,N' -dimethyl acrylamide (DMAA) graft copolymerization onto polyethylene films was carried out, using a organic solvent as a reaction medium and gamma rays from a (sup 60) Co source for surface activation. Thermal analysis revealed the crystallinity and ...

National Technical Information Service (NTIS)

8
Analise genetica da variacao induzida por radiacao gama em caracteres quantitativos de Caupi (Vigna unguiculata (L.) Walp.). (Genetical analysis of the induced variation by gamma radiation in quantitative features of Caupi (Vigna unguiculata (L.) Walp.)).
1987-01-01

Genetical analysis procedures of the cobalt 60 gamma radiation effects in the induced mutations in quantitative characters of Caupi BR-1 Poty. The following characters were evaluated: day to first flower (FI), number of pods per plant (NVP), pod lenght (C...

National Technical Information Service (NTIS)

9
Alteracoes biologicas em Musca domestica L., 1758 (Diptera: Muscidae), induzidas pela radiacao gama do cobalto-60. (Biological changes in Musca domestica L., 1758 (Diptera:Muscidae), induced by gamma radiation ((sup 60) Co)).
1989-01-01

This work was carried out in the Entomology Section of the Centre of Nuclear Energy in Agriculture (CENA), University of Sao Paulo, Piracicaba, Sao Paulo, Brazil. The objective of the present research work was to investigate some effects of gamma radiatio...

National Technical Information Service (NTIS)

10
Reacoes fotonucleares induzidas por radiacao gama de captura de neutrons, nos nucleos de U-233 e Pu-239, junto ao limiar. (Photonuclear reactions of U-233 and Pu-239 near threshold induced by thermal neutron capture gamma rays).
1990-01-01

The photonuclear cross sections of U-293 and Pu-239 have been studied by using monochromatic and discrete photons, in the energy interval from 5.49 to 9.72 MeV, produced by thermal neutron capture. The gamma fluxes incident on the samples were measured us...

National Technical Information Service (NTIS)

11
Variabilidade �ptica de longo per�odo e precess�o de jato: o caso de BL Lacertae
2003-08-01

Variabilidade � tipicamente uma caracter�stica de AGNs, sendo observada em toda a faixa eletromagn�tica. Em rela��o �s escalas de tempo, varia��es desde horas at� de algumas d�cadas foram encontradas por v�rios autores. Em alguns casos, an�lises temporais de curvas de luz mostram a exist�ncia de periodicidade nas varia��es observadas. Um exemplo de objeto que preenche ...

NASA Astrophysics Data System (ADS)

12
Le r�le de la pression porale au cours de la fracturation hydraulique et les implications pour les arriv�es brutales d'eau souterraine dans les mines et tunnels
2011-04-01

Water outbursts from the floor during underground mining, and those from the surrounding rock mass of tunnels, involve the basic principle of hydraulic fracturing. Based on the hydraulic-fracturing mechanism, considered to be dependent on the coupling between seepage and damage, it is deemed that the variation of the pore-fluid pressure coefficient must be taken into account during this coupled ...

NASA Astrophysics Data System (ADS)

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