36,146 research outputs found
Avaliação do supervisor do estagiário como ferramenta de melhoria do processo de estágio.
O objetivo deste trabalho consiste em compreender que, por meio da interpretação das avaliações dos estagiários em relação ao supervisor, é possível criar uma busca pela mudança e reflexão no comportamento do supervisor
Logarithmic behavior of degradation dynamics in metal--oxide semiconductor devices
In this paper the authors describe a theoretical simple statistical modelling
of relaxation process in metal-oxide semiconductor devices that governs its
degradation. Basically, starting from an initial state where a given number of
traps are occupied, the dynamics of the relaxation process is measured
calculating the density of occupied traps and its fluctuations (second moment)
as function of time. Our theoretical results show a universal logarithmic law
for the density of occupied traps , i.e., the degradation is logarithmic and its amplitude depends on the
temperature and Fermi Level of device. Our approach reduces the work to the
averages determined by simple binomial sums that are corroborated by our Monte
Carlo simulations and by experimental results from literature, which bear in
mind enlightening elucidations about the physics of degradation of
semiconductor devices of our modern life
Schr\"odinger formalism for a particle constrained to a surface in
In this work it is studied the Schr\"odinger equation for a non-relativistic
particle restricted to move on a surface in a three-dimensional Minkowskian
medium , i.e., the space equipped with the
metric . After establishing the consistency of the
interpretative postulates for the new Schr\"odinger equation, namely the
conservation of probability and the hermiticity of the new Hamiltonian built
out of the Laplacian in , we investigate the confining
potential formalism in the new effective geometry. Like in the well-known
Euclidean case, it is found a geometry-induced potential acting on the dynamics
which, besides
the usual dependence on the mean () and Gaussian () curvatures of the
surface, has the remarkable feature of a dependence on the signature of the
induced metric of the surface: if the signature is ,
and if the signature is . Applications to surfaces of
revolution in are examined, and we provide examples where the
Schr\"odinger equation is exactly solvable. It is hoped that our formalism will
prove useful in the modeling of novel materials such as hyperbolic
metamaterials, which are characterized by a hyperbolic dispersion relation, in
contrast to the usual spherical (elliptic) dispersion typically found in
conventional materials.Comment: 26 pages, 1 figure; comments are welcom
Determination of metabolite profiles in tropical wines by 1H NMR spectroscopy and chemometrics.
The aim of this work was to determine metabolite profiles of tropical wines produced in northeast Brazil, by using 1H NMR spectroscopy in comoination with chemometric methods to analyze and discrirninate wine samples from 2007 vintages produced by different wineries
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