[PDF] Top 20 Braz. J. Phys. vol.38 número3A

... 5: Calculated electron steady-state drift velocity in bulk InAs, AlAs and AlGaAs as a function of applied electric field at various donor concentration up to 10 18 cm − 3 at room tempera[r] ... See full document

... , (4) evolutions of the product operators under the r.f. pulse, chem- ical shift and spin-spin coupling Hamiltonians can be easily obtained. For IS(I = 1, S = 1) spin system the evolutions of some product operators under ... See full document

... In these works, the authors have treated the incorpora- tion of noise into the JCM as the stochastic fluctuations in the atom-field coupling parameter (that is assumed to fluctu- ate in [r] ... See full document

... Although AZO film can obtain a good texture surface by diluted hydrochloric acid, the etching process and surface morphology are difficult to control due to the high etching rate even if[r] ... See full document

... [21] measured similar values of hardness and elastic modulus, as here reported, by using the same instrumented indentation technique for the ab -plane of melt-textured YBCO. Comparing th[r] ... See full document

... Usually the resolution is quoted in terms of the pa- rameter “total unsharpness - (Ut)” which is evaluated by scan- ning the gray level intensity at the radiography image of a sharp edge[r] ... See full document

... In this work we consider the inhomogeneous version of the yeast cell-cycle introduced by Li et al. [3]. The cell cycle is represented by a regulatory network and the dynamics is mod- eled as a simple discrete dynamical ... See full document

... Finally, if the boundary condition is ˆ T -invariant but “not confining” (i.e., be- longing to (5)), then we can have the following cases: (i) De- generacy in the energy levels i.e., the[r] ... See full document

... We have proved that the equations of a previously studied metric nonsymmetric theory of gravitation of a field imbedded in a Minkowski space, do not admit any non-singular static solutio[r] ... See full document

... In the present paper we have addressed the problem of wave propagation in dusty plasmas, starting from a kinetic formu- lation which takes into account the incorporation of electrons and[r] ... See full document

... A completely different approach to experiment and anal- ysis involves neutron resonances in medium and heavy nu- clei. For some two decades (approximately 1960 to 1980) there were sometimes conflicting reports about ... See full document

... The dywan model can then make qualitative and quan- titative predictions in nuclear reactions at intermediate en- ergies, and this gives the possibility to investigate differ- ent dynamical aspects, as the role of the ... See full document

... Using Monte Carlo technics [11] we simulate the CXR and incoherent radiation from the liquid crystal described above, to study the dependence of radiation characteristics versus crystal [r] ... See full document

... Given the conceptual modified fast energy ADS under study [8,9], it is proposed a solid lead zero power ADS, us- ing U/Th fuel, and using as neutron source proton or deu- terium from the[r] ... See full document

... Deep–inelastic reactions are the most general re- action mechanism which can be used to study neutron–rich nuclei and are able to populate relatively high–spin states.. We used the 82 Se[r] ... See full document

... [6] J. T. Arruda-Neto, A. C. Cestari, G. P. Nogueira L. E. C. Fon- seca, C. B. Zamboni, M. Saiki, M. V. Manso, J. Mesa, V. R. Vanin, O. A. M. Helene, A. Deppman, V. P. Likhachev, A. N. Gouveia, A. C. Jorge, ... See full document

... Bacchi et al [8] presented cesium-137 profile in undisturbed soil as result of average value of eight samples sites, in increments of 5 cm, which show an exponential decrease in depth.. [r] ... See full document

... Thus, before the pCT image reconstruction, the initial and outgoing t -values for each proton in all projections should be rounded to the nearest center of sampling inter- val (hypotheti[r] ... See full document

... A comparison between the results of the symmetry model wave function (solid lines) and those of SPSM (dashed line) shows that a proper configuration mixing is very important to reproduce[r] ... See full document

... Motivated by the quality of our results, we have extended the optical potential parameters obtained in that case in order to calculate angular distributions and polariza- tions for the e[r] ... See full document