Navegação Ciências Exatas e da Terra por Autor "Livi, Rogerio Pohlmann"
Resultados 1-10 de 10
-
Chemical damage in poly (phenylene sulphide) from fast ions: dependence on the primary-ion stopping power
Papaleo, Ricardo Meurer; Hallen, A.; Sundqvist, B.U.R.; Araujo, Marco Aurelio de; Johnson, R.E.; Farenzena, Lucio Sartori; Livi, Rogerio Pohlmann (1996) [Artigo de periódico]Thin poly(phenylene sulphide) foils were bombarded with fast atomic ions (4He, 12C, 16O, 32S, 79Br, 127I) in the energy range between 2.5 to 78 MeV. In order to maintain the same ion track size for all impacting ions, their ... -
Como estimar dimensões e grandezas físicas : pequenos e grandes números
Livi, Rogerio Pohlmann (1990) [Artigo de periódico]Resumo não disponível -
Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight
Farenzena, Lucio Sartori; Livi, Rogerio Pohlmann; Araujo, Marco Aurelio de; García Bermúdez, Gerardo Jose; Papaleo, Ricardo Meurer (2001) [Artigo de periódico]Cratering and plastic deformation induced by individual MeV ions on the surface of polystyrene thin films of different molecular weights (Mw) (from 3250 to 2 X 10⁷u) are investigated using scanning force microscopy. 20 ... -
Detrapping of vacancies at in/sup 111/ in quenched silver
Arias, C. Alonso; Behar, Moni; Filevich, A.; García Bermúdez, Gerardo Jose; Savino, E.J.; Livi, Rogerio Pohlmann; Zawislak, Fernando Claudio (1981) [Artigo de periódico]The isothermal recovery of a quenched Ag foil doped with 111 ln has been studied through the time-differential perturbed-angular-correlation technique. A nearest-neighbor-vacancy configuration has produced a quadrupole ... -
Electric field gradients and impurity distributions in doped noble metals : a systematic study
Baumvol, Israel Jacob Rabin; Behar, Moni; Jornada, Joao Alziro Herz da; Livi, Rogerio Pohlmann; Lodge, Kenneth William; Zawislak, Fernando Claudio; Lopez Garcia, A. (1980) [Artigo de periódico]The electric field gradients created at 111Cd nuclei by dilute transition-element impurities in noble metais are studied by the technique of time-differential perturbed angular correlation. The present results supplement ... -
Electric quadrupole interactions of /sup 111/cd nuclei in the cubic ag lattice doped with sn impurity
Zawislak, Fernando Claudio; Livi, Rogerio Pohlmann; Schaf, Jacob; Behar, Moni (1976) [Artigo de periódico]The electric quadrupole interactions produced by near-neighbor impurity atoms of Sn on 111Cd probe nuclei in a cubic Ag lattice were studied by the time-differential perturbed angular correlation technique. The effects of ... -
Probing thermomechanical behavior of polymers at the nanometer scale with single-ion bombardment and scanning force microscopy
Papaleo, Ricardo Meurer; Oliveira, Luciano Denardin de; Farenzena, Lucio Sartori; Araujo, Marco Aurelio de; Livi, Rogerio Pohlmann (2000) [Artigo de periódico]Features produced by swift heavy ions on polymer thin films at different temperatures are used to identify the transition between vitreous and viscoelastic behaviors (the glass transition temperature) and to probe the ... -
Study of the hyperfine magnetic field acting on /sup 181/ta nuclei in ni matrix
Livi, Flavio Pohlmann; Livi, Rogerio Pohlmann; Rogers, John David; Zawislak, Fernando Claudio (1973) [Artigo de periódico]Hyperfine interactions for Ta impurities in a polycrystalline nickel matrix produced by quenching from the melt have been studied using the perturbed-angular-correlation technique. An effective hyperfine field of -89.8 ± ... -
Temperature dependence of the electric field gradient generated by nearest-neighbor impurity atoms in cubic Ag metal
Baumvol, Israel Jacob Rabin; Behar, Moni; Iglesias, Jose Roberto; Livi, Rogerio Pohlmann; Zawislak, Fernando Claudio (1978) [Artigo de periódico]The electric quadrupole interactions produced by near-neighbor (nn) and distant-neighbor impurity atoms of Cu, Au, Zn, In, Ga, Al, Sn, and Sb in a cubic Ag lattice are measured as a function of the temperature by the time ... -
Temperature dependence of the electric field gradient in cubic ag metal doped with impurities
Zawislak, Fernando Claudio; Livi, Rogerio Pohlmann; Baumvol, Israel Jacob Rabin; Schaf, Jacob; Behar, Moni (1977) [Artigo de periódico]