2,195 research outputs found
Quantum Critical Point in the Spin Glass-Kondo Transition in Heavy Fermion Systems
The Kondo-Spin Glass competition is studied in a theoretical model of a Kondo
lattice with an intra-site Kondo type exchange interaction treated within the
mean field approximation, an inter-site quantum Ising exchange interaction with
random couplings among localized spins and an additional transverse field in
the x direction, which represents a simple quantum mechanism of spin flipping.
We obtain two second order transition lines from the spin-glass state to the
paramagnetic one and then to the Kondo state. For a reasonable set of the
different parameters, the two second order transition lines do not intersect
and end in two distinct QCP.Comment: 20 pages; 1 figure; to appear in Physical Review
Field behavior of an Ising model with aperiodic interactions
We derive exact renormalization-group recursion relations for an Ising model,
in the presence of external fields, with ferromagnetic nearest-neighbor
interactions on Migdal-Kadanoff hierarchical lattices. We consider layered
distributions of aperiodic exchange interactions, according to a class of
two-letter substitutional sequences. For irrelevant geometric fluctuations, the
recursion relations in parameter space display a nontrivial uniform fixed point
of hyperbolic character that governs the universal critical behavior. For
relevant fluctuations, in agreement with previous work, this fixed point
becomes fully unstable, and there appears a two-cycle attractor associated with
a new critical universality class.Comment: 9 pages, 1 figure (included). Accepted for publication in Int. J.
Mod. Phys.
Comportamento do Angiostrongylus costaricensis em planorbÃdeos
Some terrestrial mollusks are natural hosts of Angiostrongylus costaricensis. In the laboratory, this nematode can be maintained in certain planorbids, which are aquatic mollusks and intermediate hosts of Schistosoma mansoni. Mollusks can be infected with Angiostrongylus costaricensis by ingestion of or active penetration by the first-stage larvae. In this work we assessed the ability of Biomphalaria glabrata to attract first-stage larvae of A. costaricensis. Movement of the nematode larvae towards the mollusks was observed after 15 min, 30 min and 1 h. B. glabrata did not attract the first-stage larvae of A. costaricensis in any of the three intervals. The susceptibility of two populations of Biomphalaria tenagophila to infection by A. costaricensis was also determined. One population was genetically selected for the susceptibility to S. mansoni while the other was not. Third-stage larvae were recovered from the snails 30 days after exposure of the two populations to 120 first-stage larvae. All the mollusks were infected. However, a significantly higher number of third-stage larvae were recovered in mollusks not genetically selected.Alguns moluscos terrestres são hospedeiros naturais do Angiostrongylus costaricensis. No laboratório, esse nematódeo pode ser mantido em planorbÃdeos, que são moluscos aquáticos e hospedeiros intermediários do Schistosoma mansoni. Os moluscos podem ser infectados com A. costaricensis por ingestão ou por penetração ativa de larvas de primeiro estágio. Neste trabalho, testamos a habilidade de Biomphalaria glabrata em atrair larvas de primeiro estágio de A. costaricensis. A movimentação das larvas do nematódeo em direção aos moluscos foi observada após 15 minutos, 30 minutos e 1 hora. B. glabrata não atraiu as larvas de primeiro estágio de A. costaricensis nos três intervalos de tempo. Verificamos também a suscetibilidade de duas populações de Biomphalaria tenagophila à infecção por A. costaricensis. Uma população era selecionada geneticamente para a susceptibilidade ao S. mansoni, enquanto a outra não o era. Larvas de terceiro estágio foram recuperadas dos moluscos 30 dias após a exposição das duas populações a 120 larvas de primeiro estágio. Todos os moluscos estavam infectados. Entretanto, um número significativamente maior de larvas de terceiro estágio foi recuperado em moluscos não geneticamente selecionados.19920
Androgenic alopecia: an entity to consider in adolescence
info:eu-repo/semantics/publishedVersio
Achernar: Rapid Polarization Variability as Evidence of Photospheric and Circumstellar Activity
We present the results of a high accuracy ()
polarization monitoring of the Be Star Achernar that was carried out between
July 7th and November 5th, 2006. Our results indicate that, after a near
quiescent phase from 1998 to 2002, Achernar is presently in an active phase and
has built a circumstellar disk. We detect variations both in the polarization
level and position angle in timescales as short as one hour and as long as
several weeks. Detailed modeling of the observed polarization strongly suggests
that the short-term variations originate from discrete mass ejection events
which produce transient inhomogeneities in the inner disk. Long-term
variations, on the other hand, can be explained by the formation of an inner
ring following one or several mass ejection events.Comment: 16 pages, 5 figures, Accepted to Ap
Bouncing and inflationary dynamics in quantum cosmology in the de Broglie-Bohm interpretation
The quantum cosmology of the flat Friedmann-Lema{\^i}tre-Robertson-Walker
Universe, filled with a scalar field, is considered in the de Broglie-Bohm
(dBB) interpretation framework. A stiff-matter quantum bounce solution is
obtained. The bouncing and subsequent pre-inflationary and inflationary
dynamics are studied in details. We consider some representative primordial
inflation models as examples, for which analytical expressions characterizing
the dynamical quantities can be explicitly derived. The dependence of the
inflationary dynamics on the quantum bounce parameters is then analyzed. The
parameters emerging from our description are constrained by requiring the
produced dynamics to be in accordance with some key cosmological quantities.
The constraining conditions are also illustrated through regions of parameter
space in terms of the bounce quantities.Comment: 18 pages, 2 figure
Hiperplasia Estromal Pseudoangiomatosa em idade pediátrica: caso clinico e revisão da literatura
Pseudoangiomatous stromal hyperplasia (PASH) is a rare benign disease, characterized by abnormal proliferation of fibroglandular stroma. It was first described in 1986. The authors present a case of a twelve year-old girl with a history of kidney transplantation due to nephrotic syndrome with rapidly progressive and painful breast asymmetry with approximately six months duration. No lymphadenopathy or other signs or symptoms were associated. Ultrasound didn’t reveal specific findings. Breast magnetic resonance (MR) showed a massive heterogeneous nodular mass with regular contours and contrast enhancement. Given the degree of breast asymmetry as well as the patient’s symptoms, surgical excision of the tumor was preferred over core biopsy. Histopathological and immunohistochemical examination showed pseudoangiomatous stromal hyperplasia. The authors describe the clinical presentation, imaging and histological features as well as therapeutic approach in these patientsinfo:eu-repo/semantics/publishedVersio
Tricritical behaviour in deterministic aperiodic Ising systems
We use a mixed-spin model, with aperiodic ferromagnetic exchange interactions
and crystalline fields, to investigate the effects of deterministic geometric
fluctuations on first-order transitions and tricritical phenomena. The
interactions and the crystal field parameters are distributed according to some
two-letter substitution rules. From a Migdal-Kadanoff real-space
renormalization-group calculation, which turns out to be exact on a suitable
hierarchical lattice, we show that the effects of aperiodicity are
qualitatively similar for tricritical and simple critical behaviour. In
particular, the fixed point associated with tricritical behaviour becomes fully
unstable beyond a certain threshold dimension (which depends on the
aperiodicity), and is replaced by a two-cycle that controls a weakened and
temperature-depressed tricritical singularity.Comment: Formatting improved. 7 pages, 2 figures (included). Journal reference
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