Displasia Epifisaria Hemimélica en rótula: (descripción de un nuevo caso y revisión bibliográfica)

Se describe un nuevo caso de Displasia Epifisaria Hemimélica que asienta en una legalización muy poco frecuente cual es la rótula. Realizan una amplia revisión bibliográfica de la literatura mundial y se comentan las variaciones observadas en cuanto al cuadro clínico, diagnóstico y diagnóstico diferencial.The authors describe a new case of Dysplasia Epiphysealis Hemimelica with affectation of the patela. It is a localization very infrequent. They have made a review of the literature and analyse the variations observed as for clinical findings, diagnosis and differential diagnosis

High precision determination of sea level height reached by Belgranense Ingression for North of Buenos Aires and South of Santa Fe and Entre Ríos, Argentina

En el presente trabajo se llevó a cabo, mediante técnicas geodésicas de alta precisión, la determinación de las cotas alcanzadas porel nivel del mar en depósitos aflorantes asignables a la ingresión Belgranense (Pleistoceno tardío), la cual representa el punto másalto del nivel del mar (EIM 5e) durante el Cuaternario. Las localidades relevadas en este estudio pertenecen al sector norte de laingresión y se encuentran ubicadas en el noreste de la provincia de Buenos Aires y extremo sur de las provincias de Santa Fe y EntreRíos. A partir de los datos relevados y en combinación con información preexistente y un modelo de elevación digital (MDE), se realizóuna reconstrucción tentativa de la paleolínea de costa de la ingresión Belgranense. Ante las diferencias de elevaciones ortométricaspresentadas (de aproximadamente 4 m entre los afloramientos estudiados), queda abierta, subsidiariamente, la posibilidad de unainfluencia neotectónica en el área. Se discuten los resultados especialmente en relación con eventos sísmicos históricos y recientes,principalmente aquellos registrados a fines del año 2018 en la provincia de Buenos Aires.In this work, we perform measurements of the sea level orthometric heights using high precision geodetic techniques in deposits belonging to the Belgranense ingression (Late Pleistocene) which represents the highest point of sea level (MIS 5e) during the Quaternary. The outcrops represent the northern sector of the ingression and are located in the northeast region of the province of Buenos Aires and south of the provinces of Santa Fe and Entre Ríos. Subsequently, we created a tentative reconstruction of the Belgranense paleo-coastline based on the data collected, previous information and a digital elevation model (MDE). Given the differences in orthometric heights presented (about 4 meters between the outcrops studied), possible neotectonic influence remains open. We discuss the results in the context of historical and recent seismic events, particularly those registered at the end of 2018 in the province of Buenos Aires.Fil: Cappellotto, Luiggina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Acosta, Ayelén M.C.. Ministerio de Defensa. Instituto Geografico Nacional; ArgentinaFil: Perez, Daniel José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Orgeira, Maria Julia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Gómez, Demián. Ministerio de Defensa. Instituto Geografico Nacional; Argentin

Is Vtb=1 ?

The strongest constraint on Vtb presently comes from the 3 x 3 unitarity of the CKM matrix, which fixes Vtb to be very close to one. If the unitarity is relaxed, current information from top production at Tevatron still leaves open the possibility that Vtb is sizably smaller than one. In minimal extensions of the standard model with extra heavy quarks, the unitarity constraints are much weaker and the EW precision parameters entail the strongest bounds on Vtb. We discuss the experimental perspectives of discovering and identifying such new physics models at the Tevatron and the LHC, through a precise measurement of Vtb from the single top cross sections and by the study of processes where the extra heavy quarks are produced.Comment: 19 pages, 8 figure

Lepton flavor violating signals of a little Higgs model at the high energy linear e+e−e^{+}e^{-} colliders

Littlest Higgs $(LH)$ model predicts the existence of the doubly charged scalars $\Phi^{\pm\pm}$, which generally have large flavor changing couplings to leptons. We calculate the contributions of $\Phi^{\pm\pm}$ to the lepton flavor violating $(LFV)$ processes $l_{i}\to l_{j}\gamma$ and $l_{i}\to l_{j}l_{k}l_{k}$, and compare our numerical results with the current experimental upper limits on these processes. We find that some of these processes can give severe constraints on the coupling constant $Y_{ij}$ and the mass parameter $M_{\Phi}$. Taking into account the constraints on these free parameters, we further discuss the possible lepton flavor violating signals of $\Phi^{\pm\pm}$ at the high energy linear $e^{+}e^{-}$ collider $(ILC)$ experiments. Our numerical results show that the possible signals of $\Phi^{\pm\pm}$ might be detected via the subprocesses $e^{\pm}e^{\pm}\to l^{\pm}l^{\pm}$ in the future $ILC$ experiments.Comment: 16 pages, 7 figures. Discussions and references added, typos correcte

Fully differential W' production and decay at next-to-leading order in QCD

We present the fully differential production and decay of a W' boson, with arbitrary vector and axial-vector couplings, to any final state at next-to-leading order in QCD. We demonstrate a complete factorization of couplings at next-to-leading order in both the partial width of the W' boson, and in the full two-to-two cross section. We provide numerical predictions for the contribution of a W' boson to single-top-quark production, and separate results based on whether the mass of the right-handed neutrino (nu_R) is light enough for the leptonic decay channel to be open. The single-top-quark analysis will allow for an improved direct W' mass limit of 525-550 GeV using data from run I of the Fermilab Tevatron. We propose a modified tolerance method for estimating parton distribution function uncertainties in cross sections.Comment: 23 pages, revtex3, 13 ps fig

The fully differential single-top-quark cross section in next-to-leading order QCD

We present a new next-to-leading order calculation for fully differential single-top-quark final states. The calculation is performed using phase space slicing and dipole subtraction methods. The results of the methods are found to be in agreement. The dipole subtraction method calculation retains the full spin dependence of the final state particles. We show a few numerical results to illustrate the utility and consistency of the resulting computer implementations.Comment: 37 pages, latex, 2 ps figure

Predictive Model of School Dropouts in Higher Education: An Approach From Data Mining Using the CRISP-DM Methodology

Este artículo presenta el desarrollo de un modelo para predecir, de manera temprana y oportuna, casos de estudiantes que muestren un potencial riesgo de deserción escolar, mediante el uso de técnicas de minería de datos. La deserción escolar a nivel superior es un problema multifactorial y complejo de analizar por la intervención de elementos de diversa índole, como factores familiares, académicos, educacionales, la situación económica familiar, las habilidades intelectuales de los estudiantes o la didáctica de los profesores. Este gran volumen de información a analizar no es fácilmente manejable con técnicas estadísticas tradicionales, sino que se precisa buscar estrategias que permitan operar con los bancos de datos de modo más eficiente y rápido. En el desarrollo de la propuesta se aplicó de una manera novedosa la minería de datos, para explorar los cambios en los comportamientos de los estudiantes, vinculados a diferentes causas de abandono escolar, utilizando la metodología CRISP-DM, con datos de 1,374 estudiantes de una institución de educación superior. Los resultados muestran las técnicas utilizadas para identificar y seleccionar factores asociados a la deserción estudiantil y los algoritmos para generar los modelos predictivos, de los cuáles pudo seleccionarse el más preciso, con mayor puntuación y facilidad de interpretación.This article presents the development of a model to predict, in an early and timely manner, cases of students who show a potential risk of dropping out of school, through the use of data mining techniques. High school dropout is a multifactorial and complex problem to analyze due to the intervention of diverse elements, such as family, academic, educational factors, the family economic situation, the intellectual abilities of the students or the didactics of the teachers. This large volume of information to be analyzed is not easily manageable with traditional statistical techniques, but it is necessary to find strategies that allow operating with data banks more efficiently and quickly. In the development of the proposal, data mining was applied in a novel way to explore changes in student behaviors, linked to different causes of school dropout, using the CRISP-DM methodology, with data from 1,374 students from an institution of higher education. The results show the techniques used to identify and select factors associated with student dropout, and the algorithms to generate predictive models, from which the most precise one could be selected, with the highest score and ease of interpretation

D* Production in Deep Inelastic Scattering at HERA

This paper presents measurements of D^{*\pm} production in deep inelastic scattering from collisions between 27.5 GeV positrons and 820 GeV protons. The data have been taken with the ZEUS detector at HERA. The decay channel $D^{*+}\to (D^0 \to K^- \pi^+) \pi^+$ (+ c.c.) has been used in the study. The $e^+p$ cross section for inclusive D^{*\pm} production with $5<Q^2<100 GeV^2$ and $y<0.7$ is 5.3 \pms 1.0 \pms 0.8 nb in the kinematic region {$1.3<p_T(D^{*\pm})<9.0$ GeV and $| \eta(D^{*\pm}) |<1.5$}. Differential cross sections as functions of p_T(D^{*\pm}), $\eta(D^{*\pm}), W$ and $Q^2$ are compared with next-to-leading order QCD calculations based on the photon-gluon fusion production mechanism. After an extrapolation of the cross section to the full kinematic region in p_T(D^{*\pm}) and $\eta$(D^{*\pm}), the charm contribution $F_2^{c\bar{c}}(x,Q^2)$ to the proton structure function is determined for Bjorken $x$ between 2 $\cdot$ 10$^{-4}$ and 5 $\cdot$ 10$^{-3}$.Comment: 17 pages including 4 figure