[PDF] Top 20 Braz. J. Phys. vol.39 número4

... We have presented the radiation beam profiles using phys- ical wedge filters for a 6 MV Siemens Linac. The measure- ments were conducted for field sizes of 10 × 10, 15 × 15 and 20 × 20 cm 2 , at several ... See full document

... for a sample of the order of penetration depth, the superconducting properties such as the critical fields, the critical current, the vortex lattice and the vortex itself, can present ne[r] ... See full document

... More precisely, in this paper we will investigate a law of variation for the mean Hubble parameter that yields a constant value for the deceleration parameter in a perfect fluid LRS Bian[r] ... See full document

... The merits advocated for this provisional model, the Lo- gistics differential equation supplemented by the use of the Drude model at low temperatures, are the prediction of a characteris[r] ... See full document

... On the other hand, the deficit angle introduces a possibility to scale the radius of the cylinder in such a way that a simple cylin- der and a cylinder with conicity may have the same ma[r] ... See full document

... Nonrelativistic quantum gravity, e.g., shows promise for prohibiting black holes altogether (which would eliminate singularities and also solve the black hole information paradox), gives[r] ... See full document

... The in-plane electronic band structure near the zone edge K is Dirac-like for graphene, a mixture of linear and quadratic for bilayer graphene and multilayer graphene, and quadratic for [r] ... See full document

... The values of adjustable parameters and other useful phys- ical parameters together with the values of χ 2 , using both McIntyre and Frahn-Venter models, are listed in Table 1. The value[r] ... See full document

... To substantiate the above results dielectric studies are per- formed. The variation of capacitance with respect to various external bias voltages is studied in cholesteric phase. Such a [r] ... See full document

... In Tab.III it is shown the empirical values of b as well the predict values. The value of the exponent obtained by Hem- mingsen [39] (b = 0.75) is out of our predicted range. How- ever, Prothero [40] observed that ... See full document

... de Andrade, P.R. dos Santos, and W.T.B. de Sousa Departamento de F´ısica, Universidade Estadual de Ponta Grossa, Av. Samples were prepared by a standard solid- state reaction technique. [r] ... See full document

... A second study of the parastring theory is proposed [28, 29], where the paraquantization is done by requiring that both the center of mass variables and the excitation modes of the strin[r] ... See full document

... While a detailed study of decay rates in finite size metastable potentials has been presented in Ref.[19], this paper reconsiders the infinite size instantonic theory for a bistable φ 4 [r] ... See full document

... The typical X-ray diffraction patterns for a pure Y- 123 (GA) and for Ag-doped Y-123 powders (GB, GC and GD) prior to sintering are shown in Fig. 2. The X-ray pat- terns revealed that all powders have the orthorhombic ... See full document

... [18] Siahpoush V., Tafreshi M., Sobhanian S., Khorram S., Adap- tation of Sing Lee’s model to the Filippov type plasma focus geometry, Plasma Phys. Control. Fusion 47, 1065–1075, 2005. [19] Silva P., Soto L., ... See full document

... The CW5082 interaction is construct from the Kuo- Herling interaction so-called KH5082 [5], by replacing the tow body matrix elements (TBME) of protons in the sub- shell N = 4 using the [r] ... See full document

... In the present paper we report on the thickness dependence of electrical and optical properties of ITO films, prepared by activated reactive evaporation.. ∗ Electronic address:.[r] ... See full document

... Experimental measurements in terrestrial laboratory, space and astrophysical observations of variation and fluctuation of nuclear decay constants, measurements of large enhancements in f[r] ... See full document

... mutualism system are discussed. Based on the numerical computation, it is found that: (i) The noise intensity D slows down the the fluctuation decay of species density firstly and then enhances it. (ii) The time delay τ ... See full document

... set of 39 disks was irradiated simultaneously in 39 irradiation channels of the rotary specimen rack. The channel 4 (showed in Figure 1) of the RSR is not in use at this moment. During the irradiation, the ... See full document