994 research outputs found

    Towards a global model of accounting education

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    Purpose - The purpose of this paper is to examine the accounting education systems in three countries - Australia, Japan and Sri Lanka - to inform the development and testing (by application) of a Global Model of Accounting Education

    Structure of the Isovector Dipole Resonance in Neutron-Rich 60Ca^{60}Ca Nucleus and Direct Decay from Pygmy Resonance

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    The structure of the isovector dipole resonance in neutron-rich calcium isotope, 60Ca^{60}Ca, has been investigated by implementing a careful treatment of the differences of neutron and proton radii in the continuum random phase approximation (RPARPA). The calculations have taken into account the current estimates of the neutron skin. The estimates of the escape widths for direct neutron decay from the pygmy dipole resonance (PDRPDR) were shown rather wide, implicating a strong coupling to the continuum. The width of the giant dipole resonance (GDRGDR) was evaluated, bringing on a detailed discussion about its microscopic structure.Comment: 13 pages, 2 figures, RevTex

    Neutron star properties with relativistic equations of state

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    We study the properties of neutron stars adopting relativistic equations of state of neutron star matter, calculated in the framework of the relativistic Brueckner-Hartree-Fock approximation for electrically charge neutral neutron star matter in beta-equilibrium. For higher densities more baryons (hyperons etc.) are included by means of the relativistic Hartree- or Hartree-Fock approximation. The special features of the different approximations and compositions are discussed in detail. Besides standard neutron star properties special emphasis is put on the limiting periods of neutron stars, for which the Kepler criterion and gravitation-reaction instabilities are considered. Furthermore the cooling behaviour of neutron stars is investigated, too. For comparison we give also the outcome for some nonrelativistic equations of state.Comment: 43 pages, 22 ps-figures, to be published in the International Journal of Modern Physics

    First Order Kaon Condensate

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    First order Bose condensation in asymmetric nuclear matter and in neutron stars is studied, with particular reference to kaon condensation. We demonstrate explicitly why the Maxwell construction fails to assure equilibrium in multicomponent substances. Gibbs conditions and conservation laws require that for phase equilibrium, the charge density must have opposite sign in the two phases of isospin asymmetric nuclear matter. The mixed phase will therefore form a Coulomb lattice with the rare phase occupying lattice sites in the dominant phase. Moreover, the kaon condensed phase differs from the normal phase, not by the mere presence of kaons in the first, but also by a difference in the nucleon effective masses. The mixed phase region, which occupies a large radial extent amounting to some kilometers in our model neutron stars, is thus highly heterogeneous. It should be particularly interesting in connection with the pulsar glitch phenomenon as well as transport properties.Comment: 25 pagees, 20 figures, Late

    Caracterização molecular de duas cepas do flavivírus Rocio, isoladas durante a epidemia de encefalite no Estado de São Paulo, Brasil e desenvolvimento do teste one-step RT-PCR para diagnóstico

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    Rocio virus (ROCV) was responsible for an explosive encephalitis epidemic in the 1970s affecting about 1,000 residents of 20 coastland counties in SĂŁo Paulo State, Brazil. ROCV was first isolated in 1975 from the cerebellum of a fatal human case of encephalitis. Clinical manifestations of the illness are similar to those described for St. Louis encephalitis. ROCV shows intense antigenic cross-reactivity with Japanese encephalitis complex (JEC) viruses, particularly with Ilheus (ILHV), St. Louis encephalitis, Murray Valley and West Nile viruses. In this study, we report a specific RT-PCR assay for ROCV diagnosis and the molecular characterization of the SPAn37630 and SPH37623 strains. Partial nucleotide sequences of NS5 and E genes determined from both strains were used in phylogenetic analysis. The results indicated that these strains are closely related to JEC viruses, but forming a distinct subclade together with ILHV, in accordance with results recently reported by Medeiros et al. (2007).O vĂ­rus Rocio (ROCV) foi responsĂĄvel por uma explosiva epidemia de encefalite que ocorreu nos anos 70 afetando cerca de 1.000 habitantes de 20 municĂ­pios litorĂąneos do Estado de SĂŁo Paulo, Brasil. ROCV foi isolado em 1975 de cerebelo de caso humano fatal de encefalite. As manifestaçÔes clĂ­nicas da doença sĂŁo semelhantes Ă quelas descritas para encefalite St. Louis. ROCV apresenta intensa reatividade cruzada com os vĂ­rus do Complexo da Encefalite Japonesa (JEV), particularmente com o vĂ­rus IlhĂ©us (ILHV) e com os vĂ­rus das encefalites St. Louis, Murray Valley e West Nile. Neste estudo, relatamos o desenvolvimento de um teste de RT-PCR especĂ­fico para diagnĂłstico de ROCV e a caracterização molecular das cepas SPAn37630 e SPH37623. Foi realizada a anĂĄlise filogenĂ©tica das seqĂŒĂȘncias parciais dos genes NS5 e E, de ambas as cepas. Os resultados indicaram que essas cepas sĂŁo intimamente relacionadas ao complexo JEV, mas formando um subgrupo com o ILHV, de acordo com os resultados recentemente publicados por MEDEIROS et al. (2007)

    Complete relativistic equation of state for neutron stars

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    We construct the equation of state (EOS) in a wide density range for neutron stars using the relativistic mean field theory. The properties of neutron star matter with both uniform and non-uniform distributions are studied consistently. The inclusion of hyperons considerably softens the EOS at high densities. The Thomas-Fermi approximation is used to describe the non-uniform matter, which is composed of a lattice of heavy nuclei. The phase transition from uniform matter to non-uniform matter occurs around 0.06fm−30.06 \rm{fm^{-3}}, and the free neutrons drip out of nuclei at about $2.4 \times 10^{-4}\ \rm{fm^{-3}}$. We apply the resulting EOS to investigate the neutron star properties such as maximum mass and composition of neutron stars.Comment: 23 pages, REVTeX, 9 ps figures, to appear in Phys. Rev.

    The structure of superheavy elements newly discovered in the reaction of 86^{86}Kr with 208^{208}Pb

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    The structure of superheavy elements newly discovered in the 208^{208}Pb(86^{86}Kr,n) reaction at Berkeley is systematically studied in the Relativistic Mean Field (RMF) approach. It is shown that various usually employed RMF forces, which give fair description of normal stable nuclei, give quite different predictions for superheavy elements. Among the effective forces we tested, TM1 is found to be the good candidate to describe superheavy elements. The binding energies of the 293^{293}118 nucleus and its α−\alpha-decay daughter nuclei obtained using TM1 agree with those of FRDM within 2 MeV. Similar conclusion that TM1 is the good interaction is also drawn from the calculated binding energies for Pb isotopes with the Relativistic Continuum Hartree Bogoliubov (RCHB) theory. Using the pairing gaps obtained from RCHB, RMF calculations with pairing and deformation are carried out for the structure of superheavy elements. The binding energy, shape, single particle levels, and the Q values of the α−\alpha-decay QαQ_{\alpha} are discussed, and it is shown that both pairing correlation and deformation are essential to properly understand the structure of superheavy elements. A good agreement is obtained with experimental data on QαQ_{\alpha}. %Especially, the atomic number %dependence of QαQ_{\alpha} %seems to match with the experimental observationComment: 19 pages, 5 figure
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