Local vs. long-range infection in unidimensional epidemics

We study the effects of local and distance interactions in the unidimensional contact process (CP). In the model, each site of a lattice is occupied by an individual, which can be healthy or infected. As in the standard CP, each infected individual spreads the disease to one of its first-neighbors with rate $\lambda$, and with unitary rate, it becomes healthy. However, in our model, an infected individual can transmit the disease to an individual at a distance $\ell$ apart. This step mimics a vector-mediated transmission. We observe the host-host interactions do not alter the critical exponents significantly in comparison to a process with only L\'evy-type interactions. Our results confirm, numerically, early field-theoretic predictions.Comment: 8 pages, 6 figures, to appear on Frontiers in Physic

Thermal treatment of superconductor thin film of the BSCCO system using domestic microwave oven

In this work, we report the preparation of a superconductor thin film of the BSCCO system using a good quality powder with nominal composition Bi_{1.8}Pb_{0.4}Sr_2CaCu_2O_x which was thermally treated using a domestic microwave oven (2.45 GHz, 800 W). This film was grew on a single crystal of LaAlO_3(100) substrate and exhibited a crystalline structure with the c-axis perpendicular to the plane of the substrate. An onset superconducting transition temperature was measured at 80 K.Comment: 4 pages, 5 figure

Dynamics of Counterion Condensation

Using a generalization of the Poisson-Boltzmann equation, dynamics of counterion condensation is studied. For a single charged plate in the presence of counterions, it is shown that the approach to equilibrium is diffusive. In the far from equilibrium case of a moving charged plate, a dynamical counterion condensation transition occurs at a critical velocity. The complex dynamic behavior of the counterion cloud is shown to lead to a novel nonlinear force-velocity relation for the moving plate.Comment: 5 pages, 1 ps figure included using eps

Estudo de solos do município de Barra do Quaraí - RS

bitstream/item/41456/1/MUNICIPIO-DE-BARRA-DO-QUARAI.pdf; bitstream/item/41457/1/Backup-de-BARRA-LENTE-FINALformas1.pdf; bitstream/item/41458/1/BARRA-DO-QUARAI-FINAL-fotogramet.pdf; bitstream/item/41459/1/BARRA-DO-QUARAI-FINAL-planialt.pdf; bitstream/item/41460/1/BARRA-DO-QUARAI-FINAL-uso.pdf; bitstream/item/41461/1/BARRA-LENTE-FINALaptidao.pdf; bitstream/item/41466/1/BARRA-LENTE-FINALfruticultura.pdf; bitstream/item/41467/1/BARRA-LENTE-FINALsolos.pd

Estudo dos solos do município de Pelotas.

bitstream/item/41392/1/Pelotas.pdf; bitstream/item/41393/1/mapa-geomorfologia.pdf; bitstream/item/41394/1/mapa-solos.pdf; bitstream/item/41395/1/mapa-uso-das-terras.pd

Estudo dos solos do município de Capão do Leão.

bitstream/item/41388/1/Capao-do-leao.pdf; bitstream/item/41389/1/mapa-geomorfologia.pdf; bitstream/item/41390/1/mapa-solos.pdf; bitstream/item/41391/1/mapa-uso-da-terra.pd

Estudo dos solos do municipio de Camaquã

bitstream/item/41437/1/camaqua.pdf; bitstream/item/41438/1/mapa-aptidao-de-uso-de-terras.pdf; bitstream/item/41439/1/mapa-capacidade-de-uso.pdf; bitstream/item/41441/1/mapa-formas-de-relevo.pdf; bitstream/item/41442/1/mapa-solo.pd