100 research outputs found
Ăxido de cĂĄlcio e Lactobacillus buchneri NCIMB 40788 na ensilagem de cana-de-açĂșcar in natura ou queimada
Dual Vortex Theory of Strongly Interacting Electrons: Non-Fermi Liquid to the (Hard) Core
As discovered in the quantum Hall effect, a very effective way for
strongly-repulsive electrons to minimize their potential energy is to aquire
non-zero relative angular momentum. We pursue this mechanism for interacting
two-dimensional electrons in zero magnetic field, by employing a representation
of the electrons as composite bosons interacting with a Chern-Simons gauge
field. This enables us to construct a dual description in which the fundamental
constituents are vortices in the auxiliary boson fields. The resulting
formalism embraces a cornucopia of possible phases. Remarkably,
superconductivity is a generic feature, while the Fermi liquid is not --
prompting us to conjecture that such a state may not be possible when the
interactions are sufficiently strong. Many aspects of our earlier discussions
of the nodal liquid and spin-charge separation find surprising incarnations in
this new framework.Comment: Modified dicussion of the hard-core model, correcting several
mistake
Perfil fermentativo de silagens de cana-de-açĂșcar in natura ou queimada e tratadas ou nĂŁo com Lactobacillus buchneri
Orbital-selective Mott transitions: Heavy fermions and beyond
Quantum phase transitions in metals are often accompanied by violations of
Fermi liquid behavior in the quantum critical regime. Particularly fascinating
are transitions beyond the Landau-Ginzburg-Wilson concept of a local order
parameter. The breakdown of the Kondo effect in heavy-fermion metals
constitutes a prime example of such a transition. Here, the strongly correlated
f electrons become localized and disappear from the Fermi surface, implying
that the transition is equivalent to an orbital-selective Mott transition, as
has been discussed for multi-band transition-metal oxides. In this article,
available theoretical descriptions for orbital-selective Mott transitions will
be reviewed, with an emphasis on conceptual aspects like the distinction
between different low-temperature phases and the structure of the global phase
diagram. Selected results for quantum critical properties will be listed as
well. Finally, a brief overview is given on experiments which have been
interpreted in terms of orbital-selective Mott physics.Comment: 29 pages, 4 figs, mini-review prepared for a special issue of JLT
Performance of dairy cows fed rations produced with sugarcane silages treated with additives or fresh sugarcane
Composição quĂmica e perdas fermentativas de silagem de cana-de-açĂșcar tratada com ureia ou hidrĂłxido de sĂłdio
Substituição do feno de tifton pela casca de mamona na dieta de ovinos: componentes não-carcaça
Avaliação da qualidade de vida, da dor nas costas, da funcionalidade e de alteraçÔes da coluna vertebral de estudantes de fisioterapia
O objetivo deste estudo foi avaliar a qualidade de vida, dor nas costas, funcionalidade e as alteraçÔes da coluna vertebral de estudantes de fisioterapia. Participaram 42 universitĂĄrios, sendo avaliada a coluna vertebral por meio do arcĂŽmetro, a dor nas costas por meio de um questionĂĄrio multidimensional de dor, a qualidade de vida por meio do questionĂĄrio SF-36 e funcionalidade a partir do Roland-Morris. Foi realizada estatĂstica descritiva e teste qui-quadrado (α=0,05). Os resultados demonstraram: prevalĂȘncia de alteraçÔes nas curvaturas da coluna vertebral de 38,1%; (n=16); alta prevalĂȘncia de dor nas costas (69%; n=29); baixa prevalĂȘncia de comprometimento da funcionalidade (3,4%; n=1); que nĂŁo hĂĄ associação entre as alteraçÔes nas curvaturas da coluna vertebral e funcionalidade e dor nas costas; e que os escores dos domĂnios do SF-36 foram maiores que 45, exceto o domĂnio "dor", cujo escore aproximado foi de 35. Conclui-se que quanto menor os nĂveis de intensidade da dor melhor o nĂvel de qualidade de vida
Projectile breakup dynamics for Li + Co: kinematical analysis of - coincidences
A study of the kinematics of the - coincidences in the Li +
Co system at a bombarding energy of MeV is presented.
With exclusive measurements performed over different angular intervals it is
possible to identify the respective contributions of the sequential projectile
breakup and direct projectile breakup components. A careful analysis using a
semiclassical approach of these processes provides information on both their
lifetime and their distance of occurrence with respect to the target. Breakup
to the low-lying (near-threshold) continuum is delayed, and happens at large
internuclear distances. This suggests that the influence of the projectile
breakup on the complete fusion process can be related essentially to direct
breakup to the Li high-lying continuum spectrum. %Comment: Revised version including new Fig.3 and Fig.4 with new CDCC
calculations. Accepted for publication at Eur. Phys. Jour. A. 11 pages, 6
figure
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