Bases for the Matching Lattice of Matching Covered Graphs

This article contains a brief introduction to the theory of matching covered graphs: ear-decompositions, the matching lattice and the most important results of the theory. In its last section we prove that the matching lattice of any matching covered graph has a basis consisting solely of perfect matchings and we present a conjecture relating the minimum number of double ears of any eardecomposition of a matching covered graph and the number of bricks and bricks isomorphic to the Petersen graph in any brick decomposition of the same graph

Twisting to Abelian BF/Chern-Simons Theories

Starting from a $D=3$, $N=4$ supersymmetric theory for matter fields, a twist with a Grassmann parity change is defined which maps the theory into a gauge fixed, abelian $BF$ theory on curved 3-manifolds. After adding surface terms to this theory, the twist is seen to map the resulting supersymmetric action to two uncoupled copies of the gauge fixed Chern-Simons action. In addition, we give a map which takes the $BF$ and Chern-Simons theories into Donaldson-Witten TQFT's. A similar construction, but with $N=2$ supersymmetry, is given in two dimensions.Comment: 19 pages, CTP #2237, LaTe

Gamma-Glutamyltransferase is a Reliable Marker for Tubular Effects of Contrast Media

The aim of this study was to evaluate the usefulness of the measurement of urinary excretion of the brush-border enzyme gamma glutamyl-transferase (GGT), in comparison with that of alanine aminopeptidase (AAP), as a marker for tubular toxicity due to contrast media (CM). Urinary activities of AAP and GGT were measured prior to the administration of CM and 1, 3 and 5 days after in forty-nine adult renal patients undergoing a radiological examination with intravascular administration of CM. The behavior of GGT was similar to that of AAP. In fact, urinary activities of both AAP and GGT increased greatly after CM. This effect was maximal on the 1st day and statistically significant for both enzymes. Furthermore, on the 1st day a relevant increase of enzyme activity (at least +50% over the basal value) was observed in the same number of patients (67%) for AAP and GGT. The concordance between GGT and AAP variations was high and statistically significant. Finally, different variables (osmolarity, dose of CM, and baseline renal function of the patients) had a similar effect on urinary excretion of AAP and GGT. The repeatability of duplicated determinations of GGT resulted better than that of AAP. In conclusion, the good concordance of the results of GGT with those of AAP justifies the use of GGT as a marker for tubular effects due to CM. Furthermore, the measurement of GGT has a better repeatability than that of AAP

Renormalization and finiteness of topological BF theories

We show that the BF theory in any space-time dimension, when quantized in a certain linear covariant gauge, possesses a vector supersymmetry. The generator of the latter together with those of the BRS transformations and of the translations form the basis of a superalgebra of the Wess-Zumino type. We give a general classification of all possible anomalies and invariant counterterms. Their absence, which amounts to ultraviolet finiteness, follows from purely algebraic arguments in the lower-dimensional cases.Comment: 27 p., Latex fil

A pandemia de COVID-19 e casos de violência doméstica: percepções de profissionais da atenção primária à saúde no contexto de isolamento social

Objective: to analyze the perceptions of primary health care professionals in Paranaguá/PR about the relationship between the COVID-19 pandemic and cases of domestic violence in their assigned territories, identifying challenges in the approach, impacts on families and case management. Methodology: qualitative research was conducted using semi-structured interviews and focus groups with 36 professionals from two primary health care units in Paranaguá, on the Paraná coast. Results: Primary health care professionals unanimously reported an increase in the number of domestic violence cases in those communities, affecting women, children, and adolescents, with the closure of schools identified as an aggravating factor. The main challenges highlighted were the disruption of primary health care services during the peak of the pandemic due to the reallocation of professionals and resources; misinformation about referral processes for domestic violence cases within the intersectoral network; fear among professionals regarding the pandemic and reporting domestic violence cases; and high staff turnover. Conclusion: The period of social isolation caused by the pandemic intensified domestic violence cases, according to the perceptions of primary health care professionals in Paranaguá. The dismantling of the intersectoral network further compromised the care of individuals in situations of vulnerability and/or violence. The absence of national guidelines from the federal government left municipalities and primary health care professionals on their own to deal with the issue. Submission: 03/30/23| Review: 06/14/23| Approval: 10/04/23Objetivo: analizar las percepciones de los profesionales de la atención primaria de salud de Paranaguá/PR sobre las relaciones entre la pandemia de COVID-19 y los casos de violencia doméstica en sus territorios asignados, identificando desafíos en el abordaje, impactos en las familias y gestión de casos. Metodología: investigación cualitativa con entrevistas semiestructuradas y grupos focales con 36 profesionales de dos unidades básicas de salud de Paranaguá, en la costa de Paraná. Resultados: los profesionales de la atención primaria de salud fueron unánimes al reportar el aumento del número de casos de violencia doméstica en esas comunidades, con afectaciones tanto a mujeres, niños y adolescentes, siendo el cierre de escuelas un agravante. Se informaron los principales desafíos: la interrupción de la atención primaria de salud durante el apogeo de la pandemia con el desplazamiento de profesionales y recursos; desinformación sobre los flujos de derivación de casos de violencia doméstica en la red intersectorial; miedo entre los profesionales, tanto a la pandemia como a denunciar casos de violencia doméstica; y rotación profesional. Conclusión: El período de aislamiento social provocado por la pandemia intensificó los casos de violencia doméstica según la percepción de los profesionales de la atención primaria de salud en Paranaguá. El desmantelamiento de la red intersectorial perjudicó aún más la atención a personas en situación de vulnerabilidad y/o violencia. La ausencia de directrices nacionales por parte del gobierno federal dejó a los municipios y a los profesionales de atención primaria de salud a su suerte a la hora de abordar el problema. Envío: 30/03/23| Revisión: 14/06/23| Aprobación: 04/10/23  Objetivo: analisar as percepções de profissionais da atenção primária à saúde de Paranaguá/PR sobre as relações entre a pandemia de COVID-19 e casos de violência doméstica em seus territórios adscritos, identificando desafios na abordagem, impactos nas famílias e manejo dos casos. Metodologia: pesquisa qualitativa com entrevistas semiestruturadas e grupos focais com 36 profissionais de duas unidades básicas de saúde de Paranaguá, litoral paranaense. Resultados: profissionais da atenção primária à saúde foram unânimes em relatar o aumento no número de casos de violência doméstica naquelas comunidades, com impactos tanto para mulheres, quanto para crianças e adolescentes, sendo o fechamento das escolas um fator agravante. Como principais desafios, foram reportados: a desestruturação da atenção primária à saúde durante o auge da pandemia com deslocamento de profissionais e recursos; desinformação sobre fluxos de encaminhamento nos casos de violência doméstica na rede intersetorial; medo dos profissionais, tanto da pandemia, quanto de denunciar casos de violência doméstica; e rotatividade de profissionais. Conclusão: O período de isolamento social causado pela pandemia intensificou os casos de violência doméstica segundo as percepções de profissionais da atenção primária à saúde de Paranaguá. O desmonte da rede intersetorial prejudicou ainda mais o cuidado de pessoas em situação de vulnerabilidade e/ou violência. A ausência de diretrizes nacionais do governo federal deixou municípios e profissionais da atenção primária à saúde à própria sorte para lidar com o problema. Submissão: 30/03/23| Revisão: 14/06/23| Aprovação: 04/10/2

A pair of forbidden subgraphs and perfect matchings

AbstractIn this paper, we study the relationship between forbidden subgraphs and the existence of a matching. Let H be a set of connected graphs, each of which has three or more vertices. A graph G is said to be H-free if no graph in H is an induced subgraph of G. We completely characterize the set H such that every connected H-free graph of sufficiently large even order has a perfect matching in the following cases.(1)Every graph in H is triangle-free.(2)H consists of two graphs (i.e. a pair of forbidden subgraphs).A matching M in a graph of odd order is said to be a near-perfect matching if every vertex of G but one is incident with an edge of M. We also characterize H such that every H-free graph of sufficiently large odd order has a near-perfect matching in the above cases

Realizations of Thermal Supersymmetry

We investigate realizations of supersymmetry at finite temperature in terms of thermal superfields, in a thermally constrained superspace: the Grassmann coordinates are promoted to be time-dependent and antiperiodic, with a period given by the inverse temperature. This approach allows to formulate a Kubo-Martin-Schwinger (KMS) condition at the level of thermal superfield propagators. The latter is proven directly in thermal superspace, and is shown to imply the correct (bosonic and fermionic) KMS conditions for the component fields. In thermal superspace, we formulate thermal covariant derivatives and supercharges and derive the thermal super-Poincar\'e algebra. Finally, we briefly investigate field realizations of this thermal supersymmetry algebra, focussing on the Wess-Zumino model. The thermal superspace formalism is used to characterize the breaking of global supersymmetry at finite temperature.Comment: 27 pages, no figures, LaTeX. Typos corrected and references added. To appear in Nucl. Phys.

Homicídios de mulheres e meninas no estado do Paraná: uma análise territorial retrospectiva de 2014 a 2018

O Brasil é o país com maior número absoluto de homicídios no mundo. Objetivamos realizar uma análise temporal e territorial dos homicídios contra mulheres e meninas no estado do Paraná entre 2014 e 2018. A metodologia utilizada foi um estudo ecológico retrospectivo de tendência temporal dos homicídios no período. Os dados oficiais de homicídios foram obtidos no Sistema de Informações sobre Mortalidade (SIM), do Ministério da Saúde, enquanto dados da população feminina foram obtidos do Instituto Brasileiro de Geografia e Estatística (IBGE). Os dados foram tabulados e analisados por meio de estatística descritiva, incluindo cálculo de taxas por 100 mil mulheres, características das vítimas, causa do homicídio e distribuição geográfica, os quais foram plotados em mapas no software QGIS. Os principais achados foram: 1) redução de 27% no número de homicídios contra mulheres e meninas no Paraná entre 2014 e 2018; 2) as principais causas foram por armas de fogo (44%), seguidas de objetos cortantes/perfurantes (32%); 3) o perfil das vítimas era predominantemente de mulheres jovens, de 25 a 34 anos (27%), seguido por 15 a 24 anos (25%); brancas (77%), com 4 a 7 anos de escolaridade (36%) e solteiras (61%); 4) o local mais comum do homicídio foi o domicílio, contabilizando 35% dos casos; 5) geograficamente, a região metropolitana de Curitiba, litoral, região de fronteira com o Paraguai e com o Mato Grosso do Sul, assim como o entorno de cidades como Londrina, Cascavel, Maringá e Paranavaí foram alguns clusters que apresentaram taxas de homicídio acima da média do estado