Caracterização dos solos de São José do Norte, Tavares e Mostardas-RS.

bitstream/item/41366/1/Sao-Jose-do-Norte.pdf; bitstream/item/41367/1/mapa-mostarda-capacidade-de-uso.pdf; bitstream/item/41368/1/mapa-mostarda-geomorfologia-e-solos.pdf; bitstream/item/41369/1/mapa-mostarda-solos.pdf; bitstream/item/41370/1/mapa-santa-vitoria-do-palmar-capacidade-de-uso.pdf; bitstream/item/41371/1/mapa-santa-vitoria-do-palmar-geomorfologia.pdf; bitstream/item/41372/1/mapa-santa-vitoria-do-palmar-solos.pdf; bitstream/item/41373/1/mapa-sao-jose-capacidade-de-uso.pdf; bitstream/item/41374/1/mapa-sao-jose-do-Norte.pdf; bitstream/item/41375/1/mapa-sao-jose-geomorfologia-e-solos.pdf; bitstream/item/41376/1/mapa-sao-jose-solos.pdf; bitstream/item/41377/1/mapa-Tavares-capacidade-de-uso-de-terras.pdf; bitstream/item/41378/1/mapa-Tavares-geomorfologia-e-solos.pdf; bitstream/item/41379/1/mapa-Tavares-solos.pd

Considerações sobre os solos da sub-região da Nhecolândia, Pantanal Mato-Grossense.

A Nhecolandia e uma das sub-regioes que compoem o Pantanal Mato Grossense. E totalmente constituida por sedimentos arenosos finos (95%), em deposicao pelo rio Taquari, desde o inicio do Periodo Quaternario, formando um leque aluvial. A sua superficie irregular, composta por um mesorelevo movimentado, conserva ainda a sua configuracao tipicamente aluvial, onde os cordoes arenosos (diques marginais), com cobertura vegetal de cerrado, leitos fosseis obstruidos (campos limpos e vazantes), com vegetacao de gramineas e pequenas lagoas (baias) sao uma sucessao constante. Os podzois hidromorficos -spodic psammaquent e aeric entic sideraquod - constituem os solos mais pobres e suscetiveis a lixiviacao, principalmente se quebrado o equilibrio atual com o uso. Nas bordas da planicie, para onde converge o fluxo freatico, os solos sao ferteis. Sao podzois hidromorficos eutroficos, areias quartzosas eutroficas e solonetz - aquic arenic eutrochrept. Discutem-se aspectos do uso dos solos nas partes nao alagaveis (cordoes arenosos) e a possibilidade de sua perda de fertilidade, com base em dados analiticos que evidenciam perdas de fosforo para as camadas inferiores do solo. Sao questionados alguns parametros em uso na classificacao dos solos no Pais e a sua aplicabilidade aos solos do Pantanal Mato-Grossense

Impact of stellar companions on precise radial velocities

Context: With the announced arrival of instruments such as ESPRESSO one can expect that several systematic noise sources on the measurement of precise radial velocity will become the limiting factor instead of photon noise. A stellar companion within the fiber is such a possible noise source. Aims: With this work we aim at characterizing the impact of a stellar companion within the fiber to radial velocity measurements made by fiber-fed spectrographs. We consider the contaminant star either to be part of a binary system whose primary star is the target star, or as a background/foreground star. Methods: To carry out our study, we used HARPS spectra, co-added the target with contaminant spectra, and then compared the resulting radial velocity with that obtained from the original target spectrum. We repeated this procedure and used different tunable knobs to reproduce the previously mentioned scenarios. Results: We find that the impact on the radial velocity calculation is a function of the difference between individual radial velocities, of the difference between target and contaminant magnitude, and also of their spectral types. For the worst-case scenario in which both target and contaminant star are well centered on the fiber, the maximum contamination for a G or K star may be higher than 10 cm/s, on average, if the difference between target and contaminant magnitude is $\Delta m$ < 10, and higher than 1 m/s if $\Delta m$ < 8. If the target star is of spectral type M, $\Delta m$ < 8 produces the same contamination of 10 cm/s, and a contamination may be higher than 1 m/sComment: Accepted for publication in A&A on 29/12/2019 - 14 page

Dependence of the Black-body Force on Spacetime Geometry and Topology

In this paper we compute the corrections to the black-body force (BBF) potential due to spacetime geometry and topology. This recently discovered attractive force on neutral atoms is caused by the thermal radiation emitted from black bodies and here we investigate it in relativistic gravitational systems with spherical and cylindrical symmetries. For some astrophysical objects we find that the corrected black-body potential is greater than the flat case, showing that this kind of correction can be quite relevant when curved spaces are considered. Then we consider four cases: The Schwarzschild spacetime, the global monopole, the non-relativistic infinity cylinder and the static cosmic string. For the spherically symmetric case of a massive body, we find that two corrections appear: One due to the gravitational modification of the temperature and the other due to the modification of the solid angle subtended by the atom. We apply the found results to a typical neutron star and to the Sun. For the global monopole, the modification in the black-body potential is of topological nature and it is due to the central solid angle deficit that occurs in the spacetime generated by that object. In the cylindrical case, which is locally flat, no gravitational correction to the temperature exists, as in the global monopole case. However, we find the curious fact that the BBF depends on the topology of the spacetime through the modification of the azimuthal angle and therefore of the solid angle. For the static cosmic string we find that the force is null for the zero thickness case.Comment: 8 pages, 5 figures. Revised versio

Complete high-precision entropic sampling

Monte Carlo simulations using entropic sampling to estimate the number of configurations of a given energy are a valuable alternative to traditional methods. We introduce {\it tomographic} entropic sampling, a scheme which uses multiple studies, starting from different regions of configuration space, to yield precise estimates of the number of configurations over the {\it full range} of energies, {\it without} dividing the latter into subsets or windows. Applied to the Ising model on the square lattice, the method yields the critical temperature to an accuracy of about 0.01%, and critical exponents to 1% or better. Predictions for systems sizes L=10 - 160, for the temperature of the specific heat maximum, and of the specific heat at the critical temperature, are in very close agreement with exact results. For the Ising model on the simple cubic lattice the critical temperature is given to within 0.003% of the best available estimate; the exponent ratios $\beta/\nu$ and $\gamma/\nu$ are given to within about 0.4% and 1%, respectively, of the literature values. In both two and three dimensions, results for the {\it antiferromagnetic} critical point are fully consistent with those of the ferromagnetic transition. Application to the lattice gas with nearest-neighbor exclusion on the square lattice again yields the critical chemical potential and exponent ratios $\beta/\nu$ and $\gamma/\nu$ to good precision.Comment: For a version with figures go to http://www.fisica.ufmg.br/~dickman/transfers/preprints/entsamp2.pd

Non scientific restrictions to poultry production: main global myth and beliefs.

Projeto/Plano de Ação: 11.11.11.111

Ciclo de vida de Alphitobius diaperinus Panzer (Coleoptera: Tenebrionidae) em laboratório.

Projeto/Plano de Ação: 11.11.11.111

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