Tidally-driven Roche-Lobe Overflow of Hot Jupiters with MESA

Many exoplanets have now been detected in orbits with ultra-short periods, very close to the Roche limit. Building upon our previous work, we study the possibility that mass loss through Roche lobe overflow (RLO) may affect the evolution of these planets, and could possibly transform a hot Jupiter into a lower-mass planet (hot Neptune or super-Earth). We focus here on systems in which the mass loss occurs slowly ("stable mass transfer" in the language of binary star evolution) and we compute their evolution in detail with the binary evolution code MESA. We include the effects of tides, RLO, irradiation and photo-evaporation of the planet, as well as the stellar wind and magnetic braking. Our calculations all start with a hot Jupiter close to its Roche limit, in orbit around a sun-like star. The initial orbital decay and onset of RLO are driven by tidal dissipation in the star. We confirm that such a system can indeed evolve to produce lower-mass planets in orbits of a few days. The RLO phase eventually ends and, depending on the details of the mass transfer and on the planetary core mass, the orbital period can remain around a few days for several Gyr. The remnant planets have a rocky core and some amount of envelope material, which is slowly removed via photo-evaporation at nearly constant orbital period; these have properties resembling many of the observed super-Earths and sub-Neptunes. For these remnant planets we also predict an anti-correlation between mass and orbital period; very low-mass planets ($M_{\rm pl}\,\lesssim\,5\,M_{\oplus}$) in ultra-short periods ($P_{\rm orb}$<1d) cannot be produced through this type of evolution.Comment: 14 pages, 7 figures, 2 tables. Accepted by ApJ. The manuscript has been revised significantly to address the referee's comments. A link to MESA inlist files is now provided on page

Mining for Observables: A New Challenge in Numerical Relativity

One of the motivations behind numerical relativity is to provide gravitational wave signals of compact objects to observers using the new gravitational wave detectors. Yet, because of the complexities involved, no dependable signals of binary-black hole coalescences have been established. The work in this proceedings is motivated by how numerical relativity can be used today to predict robust features in gravitational wave signals of binary black-hole coalescence by making approximations to the full problem. To illustrate this, we present results from evolving a Klein-Gordon equation on a frozen background. The background is set by a sequence of initial data in which the binary is in quasi-equilibrium. We probe the data resulting from the evolution for the transition between the linear and non-linear regimes using oscillations of the black holes as our guide. This information is used to motivate a qualitative picture of the gravitational signal of a black-hole coalescence

Control interno y gestión de compras públicas en una municipalidad de Lima – 2022

El objetivo de estudio fue determinar el vínculo existente sobre el control interno y la gestión de compras públicas en una Municipalidad de Lima durante el año 2022. Se tuvo en consideración una clasificación metodológica según su fuente fue de campo; tuvo un diseño no experimental; un enfoque cuantitativo y una tipología básica con un alcance correlacional; además se empleó la técnica del cuestionario y como instrumento la guía de preguntas. Se tuvo como resultado de los 86 encuestados que el 57% lo expresó como regular al control interno y el 81.4% de estos encuestados calificó a la gestión de compras públicas como regular. Además, se empleó el Rho de Spearman para establecer la correlación moderada con un valor de .486. Se concluyó que con respecto al objetivo general que la vinculación del control interno y la gestión de compras públicas si influyen en una municipalidad de Lima

'I' is for 'Insider': Practitioner Research in Schools

"In this paper we five teachers and teacher educators draw upon our personal classroom experiences in order to explore the definitions, descriptions, and nature of educational practitioner research, what we call teacher research. We highlight the tensions that can exist between and among teacher research, institutional needs and macro-policies, and argue that as both stance and method, teacher research can complement traditional, outsider- driven social science research. Further, practitioner research can check the errors and inequitable outcomes which may result from educational policies strictly reliant on the large-scale quantitative research designs currently dominant in the United States." (author's abstract

Sistema web para el control de inventario en la empresa Web Solutions S.A.C.

La presente tesis titulada: “Sistema web para el control de inventario en la empresa Web Solutions S.A.C” tiene como objetivo principal Determinar la influencia de una Sistema Web para el control de inventario en la empresa Web Solutions S.A.C. Para el desarrollo del sistema web se utilizó la metodología SCRUM por ser una metodología ágil, adaptable y ordenada. El software se desarrolló con el lenguaje de programación PHP, con los lenguajes de diseño y maquetación HTML, CSS y las validaciones con Java Script. Como base de datos se utilizó MySql. El tipo de investigación es aplicada- experimental, el diseño de la investigación es Pre- experimental y el enfoque es cuantitativo. La población para el primer indicador se determinó a 130 productos agrupados en 20 fichas de registro. El tamaño de la muestra estuvo conformado por 97 productos, estratificadas en 20 días. La población para el segundo indicador se determinó en 2500 pedidos agrupados en 20 fichas de registro. El tamaño de la muestra estuvo conformado por 333 pedidos, estratificadas por días. Por lo tanto, la muestra quedo conformada por 20 fichas de registro. El muestreo para los dos indicadores es el aleatorio probabilístico simple. La técnica de recolección de datos fue el fichaje y el instrumento fue la ficha de registro, los cuales fueron validados por expertos. Se concluye que el sistema web incremento el índice de Rotación de stock en un 26.85% Por lo tanto, se afirma que el sistema web incrementa el índice de Rotación de stock Se concluye que el sistema web incremento la Tasa de abastecimiento de pedidos en un 15.1% Por lo tanto, se afirma que el sistema web incrementa la Tasa de abastecimiento de pedidos

The new outfit of Neusticemys neuquina: Holw recent findings and techniques helped clarify its phylogenetic affinities

Neusticemys neuquina is one of the two known turtles from the Upper Jurassic of the Vaca Muerta Formation. Since its initial description in 1988 its taxonomic affinities have been unstable because all known specimens are postcranial elements, which seem to lack phylogenetic relevance. Initially referred, putatively, to the genus Eurysternum, it has also been considered a protostegid or a basal cryptodire. Recently, the discovery and descriptions of three skulls (MOZ 064, MACN-PV 105, MHNSR-PV-1195) and their study using computed tomography helped establish it as a member of Thalassochelydia. The new skulls have in common with Thalassochelydia: the articular process of the quadrate posteriorly oriented; the presence of a prominent, ventrally infolding ridge of the posterior surface of the processus articularis of the quadrate; a long interpterygoid contact; the presence of a pterygoid contact with the articular surfaces of the quadrate; an anterolateral recess of the anterior surface of the quadrate lateral to the processus trochlearis oticum; the presence of a fossa on the supraoccipital-opisthotic-exoccipital contact area; the foramina anterius caroticus cerebralis close together but as independent foramina in the basisphenoid; and the presence of a splenial bone in the mandible. Some of the features that distinguish it from other Thalassochelydia are the presence of a depression on the ventral surface of the basisphenoid, a relatively larger foramen nervi trigemini and reduced and steepened triturating surfaces in both the mandible and maxilla. The mandibular morphology resembles that of Dermochelys coriacea rather than that of other thalassochelydians and panchelonioids, which might indicate similarities in the feeding preferences between these species. New research has shown that thalassochelydians might have been better adapted to marine environments than previously thought and Neusticemys neuquina is not the exception.Fil: González Ruiz, Pablo. Universidad Tecnologica Nacional. Facultad Reg.san Rafael. Instituto de Evolucion, Ecologia Historica y Ambiente. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Mendoza. Instituto de Evolucion, Ecologia Historica y Ambiente.; ArgentinaFil: de la Fuente, Marcelo Saul. Universidad Tecnologica Nacional. Facultad Reg.san Rafael. Instituto de Evolucion, Ecologia Historica y Ambiente. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Mendoza. Instituto de Evolucion, Ecologia Historica y Ambiente.; ArgentinaFil: Fernández, Marta S.. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; ArgentinaTurtle Evolution Symposium 2021TrelewArgentinaMuseo Paleontológico Egidio Ferugli

PROCESSO ESTRUTURAL E POLÍTICAS PÚBLICAS: O CASO DO PARQUE NACIONAL SERRA DA CAPIVARA

This article aims to analyze, through a case study, the relationship between the implementation of a public policy and the use of the structural judicial process. The problem developed will be: To what extent can the structural process intervene in environmental public policies, without offending the principle of separation of powers? Based on this problem, the following hypothesis is developed: It is possible to use the structural process in the contribution of the institution of environmental public policies without offending the principle of separation of powers. Thus, the logical-deductive method will be used in academic research, through case studies, especially the case of Serra da Capivara National Park.O presente artigo tem por objetivo analisar, por meio do estudo de caso, a relação existente entre a concretização de uma política pública e a utilização do processo judicial estrutural. O problema desenvolvido será: Em que medida o processo estrutural pode intervir em políticas públicas ambientais, sem ofender o princípio da separação dos poderes? Partindo deste problema, desenvolve-se a seguinte hipótese: É possível a utilização do processo estrutural na contribuição de instituição de políticas públicas ambientais sem ofensa ao princípio da separação de poderes. Assim, será utilizado o método lógico-dedutivo na pesquisa acadêmica, por meio do estudo de casos, especialmente, o caso do Parque Nacional da Serra da Capivara

A TRIBUTAÇÃO NA PANDEMIA: O RESPEITO AO PRINCÍPIO DA CAPACIDADE CONTRIBUTIVA

O presente artigo tem por finalidade analisar os principais efeitos da pandemia na tributação brasileira, tendo como destaque o princípio constitucional da capacidade contributiva. O artigo traz como problema central, o seguinte questionamento: como a pandemia pode afetar a capacidade contributiva das pessoas? Partindo deste problema, desenvolve-se a seguinte hipótese: O Estado deve respeitar a capacidade contributiva das pessoas levando em consideração a retração econômica causada pela pandemia. Assim, serão abordados os efeitos da pandemia no campo da tributação tendo em vista o princípio da capacidade contributiva e qual o papel do judiciário sobre este aspecto

Septic Arthritis and Multifocal Osteomyelitis Caused by Capnocytophaga Canimorsus: A Case Report

Capnocytophaga; Osteomyelitis; Septic arthritisCapnocitofaga; Osteomielitis; Artritis sépticaCapnocytophaga; Osteomielitis; Artritis sèpticaMicrobiological diagnosis of chronic osteoarticular infections remains a major challenge, particularly when the clinical presentation is atypical and the pathogen is uncommon. In this unique case, Capnocytophaga canimorsus, a microorganism belonging to the oral microbiota of some domestic animals, caused septic arthritis and multifocal osteomyelitis in the long bone of a 43-year-old immunocompetent man. The patient was treated with two-stage surgery and local and systemic antibiotic therapy, and had a successful recovery. C. canimorsus should be considered as a possible etiological agent in patients with osteoarticular pathology and a history of exposure to domestic animals