Showing papers by "National Nuclear Energy Commission published in 1983"
TL;DR: The history of the Sabatini volcanic complex can be divided into three stages: 1) construction of the Sacrofano pyroclastic edifice by predominantly Strombolian activity.
54 citations
TL;DR: In this article, the coupled transport of Cu 2+ and H + ions through solid supported liquid membranes consisting of a porous polypropylene film immobilizing a β-hydroxy-oxime (carrier) in toluene has been studied as function of both the hydrodynamic conditions and the chemical composition of the system.
50 citations
TL;DR: In order to improve the understanding of the water in the Amazon Basin, samples of rain and moisture were collected daily at Belem and Manaus from August 78 to January 80 All isotope data are presented as discussed by the authors.
Abstract: In order to improve the understanding of the water in the Amazon Basin, samples of rain and moisture were collected daily at Belem and Manaus from August 78 to January 80 All isotope data are presented The most depleted values, sometimes lower than — 10‰ in δ18O at Belem or Manaus, were encountered during the rainy season (January-April) Possible causes of the seasonal differences in tne isotope pattern are discussed
42 citations
TL;DR: An alternative method for correcting the dose rate, maintaining the nominal source-surface distance, and not using the inverse square law, but a greater power function, is suggested.
Abstract: An analysis of the effective source–surface distance was made taking into account the influence of energy, field size, equivalent square field size, and the accelerator design. Measurements made in three accelerators showed the influence of parameters like beam flattening and collimation systems on the effective source–surface distance. A brief review of the theory is made leading to a mathematical expression for the effective source–surface distance, showing a good agreement with the experimental results. An alternative method for correcting the dose rate, maintaining the nominal source–surface distance, and not using the inverse square law, but a greater power function, is suggested.
12 citations
TL;DR: The possibility of using electron cooling in the LEAR ring, operating as a p-p-collider between 0.6 and 2.0 GeV/c, is investigated in this article.
Abstract: The possibility of using electron cooling in the LEAR ring, operating as a p-p- collider between 0.6 and 2.0 GeV/c, is investigated. Cooling times at different energies and expected luminosities are evaluated. The project of an electron source ((100÷700) keV, 10A d.c.,j==5·103 A/m2) with high-efficiency energy recovery is proposed. Problems regarding cathode, optics, beam qualities and diagnostic methods are tackled.
9 citations
TL;DR: In this article, the growth of the passivating film on a lithium electrode in contact with sulfuryl chloride solutions has been examined by micropolarization and complex impedance measurements, and the results tend to confirm the hypothesis of a two-layer film, where probably the first layer is thin and compact and the second layer is porous and defective.
4 citations
TL;DR: In this article, the authors presented the results of an elastic-plastic bi-dimensional finite element analysis for a bolted flange in a boiling water reactor vessel, which was performed by the finite element program ADINA using the incremental iteration technique.
2 citations
01 Jan 1983
TL;DR: In this article, the authors describe a facility that features a CV-28 variable energy cyclotron at the Instituto de Engenharia Nuclear in Rio de Janeiro, Brazil for among other purposes, the acquisition of neutron nuclear data for the Brazilian fast reactor programme.
Abstract: A facility is described that features a CV-28 variable energy cyclotron, at the Instituto de Engenharia Nuclear in Rio de Janeiro, Brazil, for among other purposes, the acquisition of neutron nuclear data for the Brazilian fast reactor programme. Acceptance tests, which resulted in measurements of beam emittance, energy width and time width, to assess its potential, will be presented. The initial part of the fast neutron data measurement programme, supported by the IAEA, will be concerned with the production of fast monoenergetic neutrons, in the several MeV region, to measure excitation functions of (n, 2n) reactions by the activation method. Installation of a beam transport system to allow cleaner experiments is under way. Neutron detectors are being built. Possibilities of pulsing the machine by simple suppression of some of the microstructure pulses will be discussed.
1 citations
TL;DR: In this article, thin film dosimeters (TFD) were used for beam mapping and depth dose measurements in synchrotron radiation beams produced in electron storage rings (ESR).
1 citations
TL;DR: In this paper, the response of bare cellulose nitrate (CN) LR-115, type II (Kodak-Pathe), track detector exposed to various mixtures of radon and airborne radon-daughters is investigated.
1 citations
01 Jan 1983
TL;DR: The first operation of a Free Electron Laser (FEL) was demonstrated at Stanford University as discussed by the authors, where the first coherent electromagnetic radiation of short wavelength from relativistic electrons moving in a periodic magnetic field was demonstrated.
Abstract: The first operation of a Free Electron Laser (FEL), i.e., the production of coherent electromagnetic radiation of short wavelength from relativistic electrons moving in a periodic magnetic field, was demonstrated at Stanford University1.