Minimal entropy and geometric decompositions in dimension four

We show vanishing results about the infimum of the topological entropy of the geodesic flow of homogeneous smooth four manifolds. We prove that any closed oriented geometric four manifold has zero minimal entropy if and only if it has zero simplicial volume. We also show that if a four manifold M admits a geometric decomposition, in the sense of Thurston, and does not have geometric pieces modelled on hyperbolic four-space, the complex hyperbolic plane or the product of two hyperbolic planes, then M admits an F-structure. It follows that M has zero minimal entropy and collapses with curvature bounded from below. We then analyse whether or not M admits a metric whose topological entropy coincides with the minimal entropy of M and provide new examples of manifolds for which the minimal entropy problem cannot be solved.Comment: 38 pages, corrected flat case; Theorem A is now in terms of F-structures, improved exposition; new final section collects all results needed for the proofs of the main theorem

"Nosotros no somos vagos" : la cooperativa Salvador Allende : entre el estigma, la visibilización y el reconocimiento

Tesis de LicenciaturaEn esta tesina nos proponemos analizar la manera en que opera el Salario Social Complementario (SSC) considerándolo un nuevo “plan social” impulsado y propuesto por las organizaciones sociales nucleadas principalmente en la CTEP. Este programa habilitó la creación de numerosas cooperativas. Nos centraremos en el estudio de una de ellas, la cooperativa Salvador Allende, la cual se organiza realizando tareas de mantenimiento en el Hospital Interzonal de Agudos Eva Perón (HIGA) en el partido de San Martín.Nuestra metodología consistió en realizar trabajo de campo entre abril y noviembre del año 2018 llevando adelante numerosas observaciones, charlas y entrevistas.A lo largo de nuestro recorrido, se nos presentaron las preguntas que guían nuestra investigación: ¿Qué significaciones sobre el trabajo experimentan quienes reciben el programa social? ¿De qué manera se relaciona el programa social con la producción de estigmas y que significados y re-significados le dan los trabajadores? ¿Con qué fuerza opera el estigma en la organización y prácticas de la cooperativa? ¿Qué relación tiene la cooperativa con la salud pública?En síntesis, nuestro objetivo es analizar las nociones que atraviesan a los trabajadores de la cooperativa Salvador Allende como receptores de un programa social. Cómo dichas significaciones y re-significaciones se relacionan con la producción de estigmas para ver de qué manera esa elaboración de sentidos diversos, tienen efectos sobre la cooperativa en general.Fil: Fuente Goldman, Julia de la. Universidad Nacional de San Martín. Instituto de Altos Estudios Sociales; Argentin

Commensurate Itinerant Antiferromagnetism in BaFe2As2: 75As-NMR Studies on a Self-Flux Grown Single Crystal

We report results of 75As nuclear magnetic resonance (NMR) experiments on a self-flux grown single crystal of BaFe2As2. A first-order antiferromagnetic (AF) transition near 135 K was detected by the splitting of NMR lines, which is accompanied by simultaneous structural transition as evidenced by a sudden large change of the electric field gradient tensor at the As site. The NMR results lead almost uniquely to the stripe spin structure in the AF phase. The data of spin-lattice relaxation rate indicate development of anisotropic spin fluctuations of the stripe-type with decreasing temperature in the paramagnetic phase.Comment: 7 pages, 7 figures, accepted for publication in J. Phys. Soc. Jp

The problem of shot selection in basketball

In basketball, every time the offense produces a shot opportunity the player with the ball must decide whether the shot is worth taking. In this paper, I explore the question of when a team should shoot and when they should pass up the shot by considering a simple theoretical model of the shot selection process, in which the quality of shot opportunities generated by the offense is assumed to fall randomly within a uniform distribution. I derive an answer to the question "how likely must the shot be to go in before the player should take it?", and show that this "lower cutoff" for shot quality $f$ depends crucially on the number $n$ of shot opportunities remaining (say, before the shot clock expires), with larger $n$ demanding that only higher-quality shots should be taken. The function $f(n)$ is also derived in the presence of a finite turnover rate and used to predict the shooting rate of an optimal-shooting team as a function of time. This prediction is compared to observed shooting rates from the National Basketball Association (NBA), and the comparison suggests that NBA players tend to wait too long before shooting and undervalue the probability of committing a turnover.Comment: 7 pages, 2 figures; comparison to NBA data adde

Social inclusion and ways of supporting it: Enacting frameworks constructed within an organization at the Buenos Aires Province, Argentina

El artículo se inscribe en una investigación etnográfica más amplia realizada en Argentina con organizaciones que promueven la inclusión social y laboral de personas con padecimientos subjetivos. Acorde a lo que sostiene la Ley Nacional de Salud Mental 26.657/2010 en su artículo 11 partimos de la noción inclusión social y laboral para analizar cómo se construye en una organización ubicada en la ciudad de La Plata, Provincia de Buenos Aires. Este trabajo desarrolla aspectos clave identificados en un trabajo anterior (de la Fuente Goldman y Garcia, 2022) pero tomados con mayor profundidad para poner a debate no sólo cómo dicha noción se construye en el día a día de la organización, sino también los efectos que produce en todos sus participantes, tanto las personas identificadas con padecimientos como las que inicialmente no son identificadas como tales. Nuestra perspectiva teórica y metodológica combina la etnografía y el enfoque sociolingüístico interaccional con el análisis semántico de los discursos. De esta manera, presentamos una interpretación situada de la inclusión sociolaboral, ya que hemos documentado cómo se pone en práctica y de qué manera se la retoma a nivel discursivo para construir significado en interacción. Nuestro trabajo se desarrolla de acuerdo a un enfoque colaborativo y de propiedad colectiva de conocimiento (Heras, 2014) que expresa una compleja trama de pensamiento entre las autoras en vínculos múltiples con distintos participantes.The article is part of an ethnographic larger project conducted in Argentina with organizations that promote social and labor inclusion of people with subjective disorders. We start by discussing the notion of social and labor inclusion as it is defined by the National Mental Health Law 26.657/2010 in its article 11. We then analyze how such notion is constructed in an organization located in the city of La Plata, Province of Buenos Aires. Taking as a starting point our findings from a preview piece (de la Fuente Goldman y Garcia, 2022) we develop our interpretation hear in greater depth to discuss not only social inclusion as a concept as work, daily, but also the effects on all participants in the organization, namely those who are identified as suffering and those who initially are not identified as such. Our theoretical and methodological perspective combines an ethnographic and interactional sociolinguistic approach with semantic analysis of discourses. We thus present a situated interpretation of social and laboral inclusion as embodied, as we have documented how it is put into practice and taken up discursively to construct meaning in interaction. Our work is currently being developed according to a collaborative approach and collective ownership of knowledge (Heras, 2014).Fil: de la Fuente Goldman, Julia. Universidad Nacional de San Martin. Escuela de Humanidades. Laboratorio de Investigacion En Ciencias Humanas. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Pque. Centenario. Laboratorio de Investigacion En Ciencias Humanas.; ArgentinaFil: Garcia, Elena. Universidad Nacional de La Plata; Argentina. Asociación Civil Integración Comunitaria por la Salud Mental “Una Movida de Locos"; Argentina. Centro de Salud Mental Comunitaria Pichón Rivière; Argentin

Social inclusion and ways of supporting it: Enacting frameworks constructed within an organization at the Buenos Aires Province, Argentina

El artículo se inscribe en una investigación etnográfica más amplia realizada en Argentina con organizaciones que promueven la inclusión social y laboral de personas con padecimientos subjetivos. Acorde a lo que sostiene la Ley Nacional de Salud Mental 26.657/2010 en su artículo 11 partimos de la noción inclusión social y laboral para analizar cómo se construye en una organización ubicada en la ciudad de La Plata, Provincia de Buenos Aires. Este trabajo desarrolla aspectos clave identificados en un trabajo anterior (de la Fuente Goldman y Garcia, 2022) pero tomados con mayor profundidad para poner a debate no sólo cómo dicha noción se construye en el día a día de la organización, sino también los efectos que produce en todos sus participantes, tanto las personas identificadas con padecimientos como las que inicialmente no son identificadas como tales. Nuestra perspectiva teórica y metodológica combina la etnografía y el enfoque sociolingüístico interaccional con el análisis semántico de los discursos. De esta manera, presentamos una interpretación situada de la inclusión sociolaboral, ya que hemos documentado cómo se pone en práctica y de qué manera se la retoma a nivel discursivo para construir significado en interacción. Nuestro trabajo se desarrolla de acuerdo a un enfoque colaborativo y de propiedad colectiva de conocimiento (Heras, 2014) que expresa una compleja trama de pensamiento entre las autoras en vínculos múltiples con distintos participantes.The article is part of an ethnographic larger project conducted in Argentina with organizations that promote social and labor inclusion of people with subjective disorders. We start by discussing the notion of social and labor inclusion as it is defined by the National Mental Health Law 26.657/2010 in its article 11. We then analyze how such notion is constructed in an organization located in the city of La Plata, Province of Buenos Aires. Taking as a starting point our findings from a preview piece (de la Fuente Goldman y Garcia, 2022) we develop our interpretation hear in greater depth to discuss not only social inclusion as a concept as work, daily, but also the effects on all participants in the organization, namely those who are identified as suffering and those who initially are not identified as such. Our theoretical and methodological perspective combines an ethnographic and interactional sociolinguistic approach with semantic analysis of discourses. We thus present a situated interpretation of social and laboral inclusion as embodied, as we have documented how it is put into practice and taken up discursively to construct meaning in interaction. Our work is currently being developed according to a collaborative approach and collective ownership of knowledge (Heras, 2014).Fil: de la Fuente Goldman, Julia. Universidad Nacional de San Martin. Escuela de Humanidades. Laboratorio de Investigacion En Ciencias Humanas. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Pque. Centenario. Laboratorio de Investigacion En Ciencias Humanas.; ArgentinaFil: Garcia, Elena. Universidad Nacional de La Plata; Argentina. Asociación Civil Integración Comunitaria por la Salud Mental “Una Movida de Locos"; Argentina. Centro de Salud Mental Comunitaria Pichón Rivière; Argentin

The Okamoto-Nolen-Schiffer anomaly without rho-omega mixing

We examine the effect of isospin-violating meson-nucleon coupling constants and of $\pi$-$\eta$ mixing on the binding-energy differences of mirror nuclei in a model that possesses no contribution from $\rho$-$\omega$ mixing. The ${}^{3}$He-${}^{3}$H binding-energy difference is computed in a nonrelativistic approach using a realistic wave function. We find the ${}^{3}$He-${}^{3}$H binding-energy difference very sensitive to the short-distance behavior of the nucleon-nucleon potential. We conclude that for the typically hard Bonn form factors such models can not account for the observed binding-energy difference in the three-nucleon system. For the medium-mass region (A=15--41) the binding-energy differences of mirror nuclei are computed using a relativistic mean-field approximation to the Walecka model. We obtain large binding-energy differences---of the order of several hundred keV---arising from the pseudoscalar sector. Two effects are primarily responsible for this new finding: a) the inclusion of isospin breaking in the pion-nucleon coupling constant, and b) the in-medium enhancement of the small components of the bound-state wave functions. We look for off-shell ambiguities in these results and find them to be large.Comment: 19 LaTeX pages and 2 postscript figures. Revisions/additions: Manuscript now includes a treatment of the binding-energy difference in the three-nucleon system as well as a study of possible off-shell ambiguities in the binding-energy differences of (A=15-41) mirror nucle

Does the revised cardiac risk index predict cardiac complications following elective lung resection?

Background: Revised Cardiac Risk Index (RCRI) score and Thoracic Revised Cardiac Risk Index (ThRCRI) score were developed to predict the risks of postoperative major cardiac complications in generic surgical population and thoracic surgery respectively. This study aims to determine the accuracy of these scores in predicting the risk of developing cardiac complications including atrial arrhythmias after lung resection surgery in adults. Methods: We studied 703 patients undergoing lung resection surgery in a tertiary thoracic surgery centre. Observed outcome measures of postoperative cardiac morbidity and mortality were compared against those predicted by risk. Results: Postoperative major cardiac complications and supraventricular arrhythmias occurred in 4.8% of patients. Both index scores had poor discriminative ability for predicting postoperative cardiac complications with an area under receiver operating characteristic (ROC) curve of 0.59 (95% CI 0.51-0.67) for the RCRI score and 0.57 (95% CI 0.49-0.66) for the ThRCRI score. Conclusions: In our cohort, RCRI and ThRCRI scores failed to accurately predict the risk of cardiac complications in patients undergoing elective resection of lung cancer. The British Thoracic Society (BTS) recommendation to seek a cardiology referral for all asymptomatic pre-operative lung resection patients with > 3 RCRI risk factors is thus unlikely to be of clinical benefit

Trabajo y salud mental. Dispositivos social solidarios y políticas públicas durante y pospandemia

Como en todos los lugares del mundo, la pandemia por covid-19 provocó en Argentina situaciones inesperadas y complejas, no solamente por ser completamente nuevas, sino por su gravedad y por la velocidad de sus efectos. En el ámbito de la salud mental pública se plantearon desafíos muy severos y algunos de ellos fueron atendidos con una enorme dosis de creatividad y cooperación. Un caso singular lo constituyeron los dispositivos de inclusión sociolaboral, término usado en la Ley de Salud Mental Nº 26657 para referirse a las alternativas de atención e inclusión por vía del trabajo. En tanto dichos dispositivos están insertos en diferentes contextos organizacionales (hospitales monovalentes y polivalentes, centros de día, universidades públicas, asociaciones civiles, talleres protegidos, centros de formación profesional y cooperativas de trabajo), se les presentaron cuestiones que dejaron al descubierto más claramente la importancia y necesidad de comprender cómo se efectúa en ellos el trabajo y qué aspectos normativos es preciso continuar revisando para que sus propósitos puedan cumplirse con mayor facilidad. Como punto de partida, sostenemos que estas formas de organizar el trabajo están inscriptas en el sector de la Economía social solidaria por las características que asumen. Nos concentramos en dos aspectos en nuestro análisis: por un lado, los esfuerzos por sostener el acceso al trabajo autogestionado, realizados por parte de dispositivos que participaron de un proyecto de incubación de emprendimientos sociolaborales que pertenecen a la Red de Cooperativas Sociales en Argentina y, por otro, los cambios en materia de política pública (en particular las resoluciones del Instituto Nacional de Asociativismo y Economía Social 1000/2021 y 1366/22), ya que tuvieron lugar durante y pospandemia y se vieron, en parte, informados por la labor de algunas organizaciones vinculadas a la Red de Cooperativas Sociales, entramado que nuclea a los dispositivos antes enunciados

A survey of current and past Pediatric Infectious Diseases fellows regarding training

<p>Abstract</p> <p>Background</p> <p>The objectives of this study were to characterize the satisfaction of Pediatric Infectious Diseases fellows with their training and to understand how opinions about training have changed over time.</p> <p>Methods</p> <p>Anonymous survey studies were conducted with questions designed to include areas related to the 6 ACGME core competencies. Surveys for current fellows were distributed by fellowship directors, while surveys for graduates were mailed to all individuals with Pediatric Infectious Diseases certification.</p> <p>Results</p> <p>Response rates for current fellows and graduates were 50% and 52%, respectively. Most fellows (98%) and graduates (92%) perceived their overall training favorably. Training in most clinical care areas was rated favorably, however both groups perceived relative deficiencies in several areas. Current fellows rated their training in other competency areas (e.g., systems-based practice, research, and ethics) more favorably when compared to past graduates. Recent graduates perceived their training more favorably in many of these areas compared to past graduates.</p> <p>Conclusions</p> <p>Pediatric Infectious Diseases fellowship training is well regarded by the majority of current and past trainees. Views of current fellows reflect improved satisfaction with training in a variety of competency areas. Persistent deficiencies in clinical training likely reflect active barriers to education. Additional study is warranted to validate perceived deficiencies and to establish consensus on the importance of these areas to infectious diseases training.</p