5,693 research outputs found
Pancreatoscopy-guided electrohydraulic lithotripsy in a patient with calcific chronic pancreatitis
info:eu-repo/semantics/publishedVersio
: three-body final state interactions and isospin states
Final state interactions are considered to formulate the meson decay
amplitude for the channel. The Faddeev decomposition of the
Bethe-Salpeter equation is used in order to build a relativistic three-body
model within the light-front framework. The S-wave scattering amplitude for the
system is considered in the and isospin channels with the
set of inhomogeneous integral equations solved perturbatively. In comparison
with previous results for the meson decay in the same channel, one has to
consider the different partonic processes, which build the source amplitudes,
and the larger absorption to other decay channels appears, that are important
features to be addressed. As in the decay case, the convergence of the
rescattering perturbative series is also achieved with two-loop contributions.Comment: 10 pages, 4 figure
Point-Coupling Models from Mesonic Hypermassive Limit and Mean-Field Approaches
In this work we show how nonlinear point-coupling models, described by a
Lagrangian density that presents only terms up to fourth order in the fermion
condensate , are derived from a modified meson-exchange
nonlinear Walecka model. The derivation can be done through two distinct
methods, namely, the hypermassive meson limit within a functional integral
approach, and the mean-field approximation in which equations of state at zero
temperature of the nonlinear point-coupling models are directly obtained.Comment: 18 pages. Accepted for publication in Braz. J. Phy
Estudio de metodologÃas de impregnación de Me2Si(Ind)2ZrCl2 sobre nanopartÃculas de MCM-41 para la sÃntesis de polipropileno
NanopartÃculas de MCM-41 fueron utilizadas como soporte para el complejo metalocénico (Me2Si(Ind)2ZrCl2) y su
cocatalizador metilaluminoxano (MAO), en la sÃntesis de polipropileno, Primeramente se estudiaron dos metodologÃas de
impregnación, observando los efectos en la actividad catalÃtica y masa molecular. Con estos resultados posteriormente una
tercera metodologÃa de impregnación, más optimizada, fue utilizada consiguiendo significativas mejoras en la actividad
catalÃtica. Los polÃmeros obtenidos fueron caracterizados por GPC y TGA. La utilización de estas nanopartÃculas como
soporte dio lugar a la formación de nanocompósitos de polipropileno de manera in situ. La última metodologÃa de
impregnación empleada resultó ser adecuada para este propósito, ya que permite modificar la cantidad de soporte que se
desea incorporar y variar la concentración de catalizador que será impregnada
Preventing Atomicity Violations with Contracts
Software developers are expected to protect concurrent accesses to shared
regions of memory with some mutual exclusion primitive that ensures atomicity
properties to a sequence of program statements. This approach prevents data
races but may fail to provide all necessary correctness properties.The
composition of correlated atomic operations without further synchronization may
cause atomicity violations. Atomic violations may be avoided by grouping the
correlated atomic regions in a single larger atomic scope. Concurrent programs
are particularly prone to atomicity violations when they use services provided
by third party packages or modules, since the programmer may fail to identify
which services are correlated. In this paper we propose to use contracts for
concurrency, where the developer of a module writes a set of contract terms
that specify which methods are correlated and must be executed in the same
atomic scope. These contracts are then used to verify the correctness of the
main program with respect to the usage of the module(s). If a contract is well
defined and complete, and the main program respects it, then the program is
safe from atomicity violations with respect to that module. We also propose a
static analysis based methodology to verify contracts for concurrency that we
applied to some real-world software packages. The bug we found in Tomcat 6.0
was immediately acknowledged and corrected by its development team
Diagnóstico participativo em comunidades ribeirinhas na Amazônia: peixes e sua ecologia.
Este trabalho teve o objetivo de levantar o conhecimento do ribeirinho sobre a ecologia dos peixes em relação ao hábito alimentar, e quais as principais plantas utilizadas como alimento para estas populações locais por meio de oficinas participativas
Endometriosis: A Rare Cause of Large Bowel Obstruction.
Large bowel obstruction can result in significant morbidity and mortality, especially in cases of acute complete obstruction. There are many possible causes, the most common in adults being colorectal cancer. Endometriosis is a benign disease, and the most affected extragenital location is the bowel, especially the rectosigmoid junction. However, transmural involvement and acute occlusion are very rare events. We report an exceptional case of acute large bowel obstruction as the initial presentation of endometriosis. The differential diagnosis of colorectal carcinoma may be challenging, and this case emphasizes the need to consider intestinal endometriosis in females at a fertile age presenting with gastrointestinal symptoms and an intestinal mass causing complete large bowel obstruction.info:eu-repo/semantics/publishedVersio
Inspecção e reabilitação do Seminário Conciliar de Braga
Apresenta-se o diagnóstico, análise e reforço de um edifÃcio dos anos 30, realizado
essencialmente em betão armado, mas com paredes de contorno em cantaria de granito. Devido a uma alteração de uso, de seminário para arquivo, realizaram-se diferentes análises estruturais (lineares e não-lineares) para definir as condições de segurança do edifÃcio. Dada a necessidade de reforço, discutem-se diferentes alternativas e detalha-se o projecto de execução
Imaging Techniques in Breast Cancer
Existem vários métodos de Imagem que permitem avaliar a mama. Estes métodos têm conhecido uma evolução importante, quer
por melhoria de técnicas como a mamografia, ecografia e Ressonância Magnética, quer pelo aparecimento de novas técnicas, como a
tomossÃntese. Os autores abordam as diferentes técnicas de Imagem da mama, as suas indicações e caracterÃsticas, bem como alguns aspectos tecnológicos que correspondem a melhorias recentes
- …