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Search Results: 1 - 10 of 323801 matches for " L. O. Santos "
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Carryover Effect of Imidazolinone Herbicides for Crops Following Rice  [PDF]
L. O. Santos, J. J. O. Pinto, L. B. Piveta, J. A. Noldin, L. Galon, G. Concen?o
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.58117

We aimed with this study to evaluate the effects of residual activity in soil of formulated mixtures of the herbicides imazethapyr + imazapic and imazapyr + imazapic on ryegrass and on rice cultivars, IRGA 424 and BRS Querencia. Two experiments were conducted under greenhouse in randomized blocks design with four replications in split-plot and split-split-plot designs, respectively for the first (E1) and second (E2) experiments. For E1, main plots allocated herbicides (imazethapyr + imazapic and imazapyr + imazapic), and subplots the doses [(0, 0.5, 1.0, 1.5 and 2.0 fold the label dose of imazethapyr + imazapic (1 L·ha-1) and imazapyr + imazapic (140 g·ha

Padr o em vidro fosco nas doen as pulmonares difusas. Correla o da tomografia computadorizada de alta resolu o com a anatomopatologia
Santos Maria Lúcia O.
Radiologia Brasileira , 2002,
Collapsing Spheres Satisfying An "Euclidean Condition"
L. Herrera,N. O. Santos
Physics , 2009, DOI: 10.1007/s10714-010-0986-4
Abstract: We study the general properties of fluid spheres satisfying the heuristic assumption that their areas and proper radius are equal (the Euclidean condition). Dissipative and non-dissipative models are considered. In the latter case, all models are necessarily geodesic and a subclass of the Lemaitre-Tolman-Bondi solution is obtained. In the dissipative case solutions are non-geodesic and are characterized by the fact that all non-gravitational forces acting on any fluid element produces a radial three-acceleration independent on its inertial mass.
Dynamics of dissipative gravitational collapse
L. Herrera,N. O. Santos
Physics , 2004, DOI: 10.1103/PhysRevD.70.084004
Abstract: The Misner and Sharp approach to the study of gravitational collapse is extended to the dissipative case in, both, the streaming out and the diffusion approximations. The role of different terms in the dynamical equation are analyzed in detail. The dynamical equation is then coupled to a causal transport equation in the context of Israel--Stewart theory. The decreasing of the inertial mass density of the fluid, by a factor which depends on its internal thermodynamics state, is reobtained, at any time scale. In accordance with the equivalence principle, the same decreasing factor is obtained for the gravitational force term. Prospective applications of this result to some astrophysical scenarios are discussed.
A general relativistic effect in quasi-spherical objects as the possible origin of relativistic jets
L. Herrera,N. O. Santos
Physics , 2005, DOI: 10.1007/s10509-007-9509-5
Abstract: Based on recently reported results, we present arguments that sign changes in proper acceleration of test particles on the symmetry axis and close to the r=2M surface of quasi-spherical objects - related to the quadrupole moment of the source - might be at the origin of relativistic jets of quasars and micro-quasars.
Geodesics in Lewis Spacetime
L. Herrera,N. O. Santos
Physics , 1997, DOI: 10.1063/1.532470
Abstract: The geodesic equations are integrated for the Lewis metric and the effects of the different parameters appearing in the Weyl class on the motion of test particles are brought out. Particular attention deserves the appearance of a force parallel to the axial axis and without Newtonian analogue.
Shear-free and homology conditions for self-gravitating dissipative fluids
L. Herrera,N. O. Santos
Physics , 2003, DOI: 10.1046/j.1365-8711.2003.06764.x
Abstract: The shear free condition is studied for dissipative relativistic self-gravitating fluids in the quasi-static approximation. It is shown that, in the Newtonian limit, such condition implies the linear homology law for the velocity of a fluid element, only if homology conditions are further imposed on the temperature and the emission rate. It is also shown that the shear-free plus the homogeneous expansion rate conditions are equivalent (in the Newtonian limit) to the homology conditions. Deviations from homology and their prospective applications to some astrophysical scenarios are discussed, and a model is worked out.
Cylindrical Collapse and Gravitational Waves
L. Herrera,N. O. Santos
Physics , 2005, DOI: 10.1088/0264-9381/22/12/007
Abstract: We study the matching conditions for a collapsing anisotropic cylindrical perfect fluid, and we show that its radial pressure is non zero on the surface of the cylinder and proportional to the time dependent part of the field produced by the collapsing fluid. This result resembles the one that arises for the radiation - though non-gravitational - in the spherically symmetric collapsing dissipative fluid, in the diffusion approximation.
On the gravitomagnetic effects in cylindrically symmetric spacetimes
L. Herrera,N. O. Santos
Mathematics , 2001, DOI: 10.1063/1.1402632
Abstract: Using gyroscopes we generalize results, obtained for the gravitomagnetic clock effect in the particular case when the exterior spacetime is produced by a rotating dust cylinder, to the case when the vacuum spacetime is described by the general cylindrically symmetric Lewis spacetime. Results are contrasted with those obtained for the Kerr spacetime.
Allelopathic potential and systematic evaluation of secondary compounds in extracts from roots of Canavalia ensiformis by capillary electrophoresis
Santos, S.;Moraes, M. L. L.;Rezende, M. O. O.;
Eclética Química , 2007, DOI: 10.1590/S0100-46702007000400002
Abstract: organic extracts were obtained from roots of canavalia ensiformis and evaluated for allelopathic potential on the germination of the weed seeds: mimosa pudica, cassia tora and cassia occidentalis showing a strong allelopathic potential. after that, a systematic study of these crude extracts was made using specific protocols developed in capillary electrophoresis (ce) in order to determine some classes of secondary metabolites. capillary electrophoresis protocols were highly specific, which makes it possible to identify 5 classes of compounds using the same crude extract samples and analyze them fartly. some of the compounds identified show activity in the inhibition of seeds germination.
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