Random Nuclei
Mostrando 1-12 de 58 artigos, teses e dissertações.
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1. Analysis of transformations nucleated on non-random sites simulated by cellular automata in three dimensions
Cellular automata simulation in three dimensions is carried out to simulate microstrutural evolution for nuclei distribution ranging from a periodic arrangement to clusters of nuclei. The effect of clustering in three dimensions is found to be much more difficult to detect using conventional microstructural path analysis than in two dimensions. Microstructur
Materials Research. Publicado em: 2007-06
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2. The spreading width calculation of giant resonances with a semi-microscopic approach
We have proposed a semi-microscopic approach to calculate the two particles - two holes (2p - 2h) spreading width of giant resonances. Our proposal has been based in a hybrid method that implements the statistical multistep compound theory of Feshbach, Kerman and Koonin (FKK), widely and successful used in nuclear reactions mechanisms, in order to include re
Brazilian Journal of Physics. Publicado em: 2006-12
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3. Microstructural descriptors and cellular automata simulation of the effects of non-random nuclei location on recrystallization in two dimensions
The effect of non-random nuclei location and the efficiency of microstructural descriptors in assessing such a situation are studied. Cellular automata simulation of recrystallization in two dimensions is carried out to simulate microstrutural evolution for nuclei distribution ranging from a periodic arrangement to clusters of nuclei. The simulation results
Materials Research. Publicado em: 2006-06
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4. Partial escape width for nuclei with neutron excess
In this work, the escape width for nuclei with neutron excess is calculated by continuum Random Phase Approximation (RPA) with a careful treatment on the differences between the densities of neutrons and protons.
Brazilian Journal of Physics. Publicado em: 2005-09
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5. Statistical behavior and symmetry tests
Symmetries and statistical properties in nuclei are closely related. The most striking example is the extremely large enhancement of parity violation in neutron resonances. Statistical distributions can provide information about the underlying character of nuclear properties. Level statistics and electromagnetic transition distributions have been used succes
Brazilian Journal of Physics. Publicado em: 2004-09
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6. The use of the random nucleus for identification of clubs of convergence between Brazilian states and cities / O uso do nÃcleo estocastico para identificaÃÃo de clubes de convergÃncia entre estados e municÃpios brasileiros
The studies about convergence in Brazil have concentrated in the β and σ- convergence analysis. In this thesis is presented a new methodolgy to study convergence, that analyses how the income distribution among brazilian states and municipalities evolves over the time. Three kinds of estimation are done: a) kernel smoothed densities are estimated t
Publicado em: 2004
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7. Estrutura nuclear e competição entre modos de decaimento de ressonancia gigantes
The low-lying leveI structure of the odd-mass Pb isotopes ( 193A205) is investigated in terms of the projected BCS approximation (PBCS) with one- and three- quasiparticle. A surface delta interaction (SDI) is used as residual interaction. Excitation energies, spectroscopic factors magnetic dipole and electric quadrupole moments are calculated and compared wi
Publicado em: 1997
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8. Relationship of Nuclear Segregation and Macroconidial Germination in Microsporum gypseum1
Microsporum gypseum macroconidia germinated at 37 C possessed from one to eight nuclei per germinated spore compartment. The distribution of nuclei per spore compartment was the result of a random packaging of nuclei from the available nuclear population. Partial inhibition of germination by incubation at 25 C or at 37 C in the presence of 10−4m phenyl met
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9. Nonrandom Sister Chromatid Segregation and Nuclear Migration in Hyphae of Aspergillus nidulans
Radioactive conidiospores of Aspergillus nidulans were prepared by growing a purine-requiring mutant with tritiated adenine. When these spores germinated in a nonradioactive medium, the dispersion of the original chromosome set could be followed by treating the hyphae with ribonuclease and preparing radioautograms. Germinating spores with four or eight nucle
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10. Muscle differentiation and morphogenesis in the regenerating tail of lizards.
The differentiation of muscles in the lizards Anolis and Lampropholis with tails that had regenerated for 21-50 d was investigated by light and electron microscope autoradiography using tritiated thymidine. At the apex of the regenerating tail, groups of 4-8 myoblasts of the promuscle aggregates fused to produce bundles of myotubes whose multiple labelled an
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11. Replication of polyoma DNA in isolated nuclei: analysis of replication fork movement.
The movement of replication forks during polyoma DNA synthesis in isolated nuclei was analyzed by digesting newly synthesized DNA with the restriction endonuclease HpaII which cleaves polyoma DNA into eight unique fragments. The terminus of in vitro DNA synthesis was identified by cleaving newly completed molecules with HpaII. The distribution of label in th
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12. Preferential transcription of the ovalbumin gene in isolated hen oviduct nuclei by RNA polymerase B.
The synthesis of ovalbumin mRNA sequences was studied in isolated nuclei from hen oviduct. Two different methods of analysis were used to distinguish in vitro synthesized from preexisting mRNA sequences: (i) Mercurated ribonucleotides were used for in vitro RNA synthesis, and the newly synthesized RNA was purified by chromatography on sulfhydryl-agarose and