1,308 research outputs found
PCR-based Landmark Unique Gene (PLUG) markers are a useful tool for comparative genomic analysis and BAC clone screening in wheat
Dissertação de mestrado em Psicologia Clínica e Saúde (Psicopatologia e Psicoterapia Dinâmica), apresentada à Faculdade de Psicologia e Ciências da Educação da Universidade de CoimbraOs pacientes infetados pelo VIH têm sido objeto de interesse por parte
dos profissionais de saúde mental pela dimensão do impacto psicológico do
diagnóstico, evolução da infeção e a vulnerabilidade destes sujeitos. Seja
como for, em traço de evolução da terapêutica, a infeção pelo vírus da
imunodeficiência humana (VIH) é, atualmente, uma doença tendencialmente
crónica.
Entre as perturbações mentais, a depressão é descrita como uma das
comorbidades mais frequentes nos indivíduos com VIH e que muitas vezes
passa despercebida. Acompanha-se de elevada morbilidade e apresenta um
impacto sócio-económico, sendo uma das causas mais frequentes de
suicídio. Para além da incapacidade que se vai instalando progressivamente,
os indivíduos são confrontados com o estigma social, carência de apoio
social e isolamento.
Neste sentido, este estudo foi realizado com o intuito de chamar a
atenção para a necessidade de intervenção psicoterapêutica com esta
população, através da exploração dos sintomas psicopatológicos mais
prevalentes (com especial destaque para a depressão e para a ideação
suicida), tendo em consideração a progressão da doença e a as caraterísticas
socio-demográficas.Patients infected with HIV have been the object of interest on the part
of mental health professionals due to the dimension of the psychological
impact of the diagnosis, the course of infection and the vulnerability of these
subjects. Anyway, in trait evolution of therapy, infection by the human
immunodeficiency virus (HIV) is currently a chronic disease.
Among mental disorders, depression is described as one of the most
frequent comorbidities in individuals infected with HIV and which often
goes unnoticed. It is accompanied by high morbidity and presents a socialeconomic
impact, being one of the most frequent causes of suicide. Beyond
the progressively established disability, individuals face social stigma, lack
of social support and isolation.
Thus, this study was conducted in order to draw attention to the need
for psychotherapeutic intervention among this population, through the
exploitation of the most prevalent psychopathological symptoms (with
special emphasis on depression and suicidal ideation), taking into account
the progression of this disease and the social-demographic characteristics
Two tricritical lines from a Ginzburg-Landau expansion: application to the LOFF phase
We study the behavior of the two plane waves configuration in the LOFF phase
close to T=0. The study is performed by using a Landau-Ginzburg expansion up to
the eighth order in the gap. The general study of the corresponding grand
potential shows, under the assumption that the eighth term in the expansion is
strictly positive, the existence of two tricritical lines. This allows to
understand the existence of a second tricritical point for two antipodal plane
waves in the LOFF phase and justifies why the transition becomes second order
at zero temperature. The general analysis done in this paper can be applied to
other cases.Comment: LaTex file, 15 pages, 6 figure
Density of States and Energy Gap in Andreev Billiards
We present numerical results for the local density of states in semiclassical
Andreev billiards. We show that the energy gap near the Fermi energy develops
in a chaotic billiard. Using the same method no gap is found in similar square
and circular billiards.Comment: 9 pages, 6 Postscript figure
The Superconducting Proximity Effect as a Tool to Investigate Metal Films and Interfaces
052The superconducting
proximity effect is measured in sandwiches of thin Pb films and the alkali
metals Cs, Rb, K and Na. The -dependence provides information about the
interface barriers between Pb and the alkalis. Such a barrier is particularly
large in Pb/Cs sandwiches. It is not due to impurities or oxydation. In the
presence of a sufficiently strong barrier a special form of the Cooper limit
can be applied to calculate the transition temperature of the sandwich
Bogoliubov - de Gennes versus Quasiclassical Description of Josephson Structures
The applicability of the quasiclassical theory of superconductivity in
Josephson multi-layer structures is analyzed. The quasiclassical approach is
compared with the exact theory based on the Bogoliubov - de Gennes equation.
The angle and energy resolved (coarse-grain) currents are calculated using both
techniques. It is shown that the two approaches agree in geometries
after the coarse-grain averaging. A quantitative discrepancy, which exceeds the
quasiclassical accuracy, is observed when three or more interfaces are present.
The invalidity of the quasiclassical theory is attributed to the presence of
closed trajectories formed by sequential reflections on the interfaces.Comment: revtex4,12 pages, 12 figure
Energy and pressure densities of a hot quark-gluon plasma
We calculate the energy and hydrostatic pressure densities of a hot
quark-gluon plasma in thermal equilibrium through diagrammatic analyses of the
statistical average, , of the
energy-momentum-tensor operator . To leading order at high
temperature, the energy density of the long wave length modes is consistently
extracted by applying the hard-thermal-loop resummation scheme to the
operator-inserted no-leg thermal amplitudes .
We find that, for the long wave length gluons, the energy density, being
positive, is tremendously enhanced as compared to the noninteracting case,
while, for the quarks, no noticeable deviation from the noninteracting case is
found.Comment: 33 pages. Figures are not include
Ultrafast optical nonlinearity in quasi-one-dimensional Mott-insulator
We report strong instantaneous photoinduced absorption (PA) in the
quasi-one-dimensional Mott insulator in the IR spectral
region. The observed PA is to an even-parity two-photon state that occurs
immediately above the absorption edge. Theoretical calculations based on a
two-band extended Hubbard model explains the experimental features and
indicates that the strong two-photon absorption is due to a very large
dipole-coupling between nearly degenerate one- and two-photon states. Room
temperature picosecond recovery of the optical transparency suggests the strong
potential of for all-optical switching.Comment: 10 pages, 4 figure
Rough Surface Effect on Meissner Diamagnetism in Normal-layer of N-S Proximity-Contact System
Rough surface effect on the Meissner diamagnetic current in the normal layer
of proximity contact N-S bi-layer is investigated in the clean limit. The
diamagnetic current and the screening length are calculated by use of
quasi-classical Green's function. We show that the surface roughness has a
sizable effect, even when a normal layer width is large compared with the
coherence length . The effect is as large as that
of the impurity scattering and also as that of the finite reflection at the N-S
interface.Comment: 12 pages, 3 figures. To be published in J. Phys. Soc. Jpn. Vol.71-
Andreev Bound States and Self-Consistent Gap Functions for SNS and SNSNS Systems
Andreev bound states in clean, ballistic SNS and SNSNS junctions are
calculated exactly and by using the Andreev approximation (AA). The AA appears
to break down for junctions with transverse dimensions chosen such that the
motion in the longitudinal direction is very slow. The doubly degenerate states
typical for the traveling waves found in the AA are replaced by two standing
waves in the exact treatment and the degeneracy is lifted.
A multiple-scattering Green's function formalism is used, from which the
states are found through the local density of states. The scattering by the
interfaces in any layered system of ballistic normal metals and clean
superconducting materials is taken into account exactly. The formalism allows,
in addition, for a self-consistent determination of the gap function. In the
numerical calculations the pairing coupling constant for aluminum is used.
Various features of the proximity effect are shown
- …