Por una antropología histórica, crítica de esencializaciones culturales. Sobre un compromiso desde la Universidad Veracruzana

Reflection on the theoretical-methodological specificities of Avatares de la antropología histórica (Kuri and Millán 2021), a book on the origins, particularities and challenges of the degree in historical anthropology at the Universidad Veracruzana, twenty years after its foundation. I situate their proposals with respect to international debates in order to emphasize the relevance of their critical emphasis on cultural essentializations. They focused on relational and interpretative analyses on the production of meanings, referring to links between everyday practices and their socio-spatial conditions of realization, in order to distance themselves from ontological, structuralist and static concepts of culture and identity, traditions, space and body, as well as objectivist notions of history, archives and collective memory. I conclude on key theoretical-methodological opportunities and challenges to further enrich the anthropological-historical orientation of their program: on links between signification and power, and on their positions in debates on the specificities of a historical anthropology.Reflexión sobre las especificidades teórico-metodológicas de Avatares de la antropología histórica (Kuri y Millán 2021), libro sobre los orígenes, particularidades y retos de la licenciatura en antropología histórica de la Universidad Veracruzana, a veinte años de su fundación. Ubico sus propuestas respecto de debates internacionales a fin de resaltar la relevancia de su énfasis crítico de esencializaciones culturales. Se han centrado en análisis relacionales e interpretativos sobre la producción de significaciones, referidos a vínculos entre prácticas cotidianas y sus condiciones socio-espaciales de realización, a fin de distanciarse de conceptos ontológicos, estructuralistas y estáticos de cultura e identidad, tradiciones, espacio y cuerpo, así como de nociones objetivistas de historia, archivos y memoria colectiva. Termino sobre oportunidades y retos teórico-metodológicos clave para que sigan enriqueciendo la orientación antropológico-histórica de su programa: sobre vínculos entre significación y poder, y sobre sus posicionamientos en debates sobre las especificidades de una antropología histórica

BVRI Surface Photometry of Isolated Spiral Galaxies

A release of multicolor broad band (BVRI) photometry for a subsample of 44 isolated spirals drawn from the Catalogue of Isolated Galaxies (CIG) is presented. Total magnitudes and colors at various circular apertures, as well as some global structural/morphological parameters are estimated. Morphology is reevaluated through optical and sharp/filtered R band images, (B-I) color index maps, and archive near-IR JHK images from the Two-Micron Survey. The CAS structural parameters (Concentration, Asymmetry, and Clumpiness) were calculated from the images in each one of the bands. The fraction of galaxies with well identified optical/near-IR bars (SB) is 63%, while a 17% more shows evidence of weak or suspected bars (SAB). The sample average value of the maximum bar ellipticity is 0.4. Half of the galaxies in the sample shows rings. We identify two candidates for isolated galaxies with disturbed morphology. The structural CAS parameters change with the observed band, and the tendencies they follow with the morphological type and global color are more evident in the redder bands. In any band, the major difference between our isolated spirals and a sample of interacting spirals is revealed in the A-S plane. A deep and uniformly observed sample of isolated galaxies is intended for various purposes including (i) comparative studies of environmental effects, (ii) confronting model predictions of galaxy evolution and (iii) evaluating the change of galaxy properties with redshift.Comment: 44 pages, 9 figures and 7 tables included. To appear in The Astronomical Journal. For the 43 appendix figures 4.1-4.43 see http://www.astroscu.unam.mx/~avila/Figs4.1_4.43.tar.gz (7.2 Mb tar.gz file

Emanation Study of Gas Radon on the Ancient Cuexcomate Geyser in Puebla City, Mexico

Radon measurements were collected over a period of nine months in the area of the ancient Cuexcomate geyser, in Puebla City. For measuring radon, the passive method of nuclear tracks in solids was used, using polycarbonate CR-39 as radiation sensitive material. Radon concentrations varied in strong anti-correlation with the rainfall intensity. And are lower compared to other locations, in concordance with the stratigraphic composition, as travertine and deposits of volcanic origin, corresponding to the geyser chemical composition and the active environment in the north part of the Trans-Mexican Volcanic Belt with an andesitic and basalt composition

Nuclear Tracks Morphology Study Using Raman Methodology

In this work, a new methodology for rendering profiles of etched nuclear tracks is presented, using confocal micro-Raman spectrometry instrumentation. The precise profile of etched nuclear tracks with normal and/or angular incidence of the particle can be determined in few minutes, with a great visual and numerical resolution, that means a quantitative and qualitative simultaneous chemical and morphology characterization with the Raman technique. The Raman image routine is designed to acquire at each image pixel a complete Raman spectrum. This is a mapping of the functional groups that form the polymeric structure, which may be broken by the damage caused by the incident radiation and/or the etching process

A sensitivity analysis of the WFCAM Transit Survey for short-period giant planets around M dwarfs

The WFCAM Transit Survey (WTS) is a near-infrared transit survey running on the United Kingdom Infrared Telescope (UKIRT), designed to discover planets around M dwarfs. The WTS acts as a poor-seeing backup programme for the telescope, and represents the first dedicated wide-field near-infrared transit survey. In this paper we describe the observing strategy of the WTS and the processing of the data to generate lightcurves. We describe the basic properties of our photometric data, and measure our sensitivity based on 950 observations. We show that the photometry reaches a precision of ~4mmag for the brightest unsaturated stars in lightcurves spanning almost 3 years. Optical (SDSS griz) and near-infrared (UKIRT ZYJHK) photometry is used to classify the target sample of 4600 M dwarfs with J magnitudes in the range 11-17. Most have spectral-types in the range M0-M2. We conduct Monte Carlo transit injection and detection simulations for short period (<10 day) Jupiter- and Neptune-sized planets to characterize the sensitivity of the survey. We investigate the recovery rate as a function of period and magnitude for 4 hypothetical star-planet cases: M0-2+Jupiter, M2-4+Jupiter, M0-2+Neptune, M2-4+Neptune. We find that the WTS lightcurves are very sensitive to the presence of Jupiter-sized short-period transiting planets around M dwarfs. Hot Neptunes produce a much weaker signal and suffer a correspondingly smaller recovery fraction. Neptunes can only be reliably recovered with the correct period around the rather small sample (~100) of the latest M dwarfs (M4-M9) in the WTS. The non-detection of a hot-Jupiter around an M dwarf by the WFCAM Transit Survey allows us to place an upper limit of 1.7-2.0 per cent (at 95 per cent confidence) on the planet occurrence rate.Comment: 20 pages, 13 figures; accepted for publication in MNRA

Searching for transits in the Wide Field Camera Transit Survey with difference-imaging light curves

The Wide Field Camera Transit Survey is a pioneer program aiming at for searching extra-solar planets in the near-infrared. The images from the survey are processed by a data reduction pipeline, which uses aperture photometry to construct the light curves. We produce an alternative set of light curves using the difference-imaging method for the most complete field in the survey and carry out a quantitative comparison between the photometric precision achieved with both methods. The results show that differencephotometry light curves present an important improvement for stars with J > 16. We report an implementation on the box-fitting transit detection algorithm, which performs a trapezoid-fit to the folded light curve, providing more accurate results than the boxfitting model. We describe and optimize a set of selection criteria to search for transit candidates, including the V-shape parameter calculated by our detection algorithm. The optimized selection criteria are applied to the aperture photometry and difference-imaging light curves, resulting in the automatic detection of the best 200 transit candidates from a sample of ~475 000 sources. We carry out a detailed analysis in the 18 best detections and classify them as transiting planet and eclipsing binary candidates. We present one planet candidate orbiting a late G-type star. No planet candidate around M-stars has been found, confirming the null detection hypothesis and upper limits on the occurrence rate of short-period giant planets around M-dwarfs presented in a prior study. We extend the search for transiting planets to stars with J ≤ 18, which enables us to set a stricter upper limit of 1.1%. Furthermore, we present the detection of five faint extremely-short period eclipsing binaries and three M-dwarf/M-dwarf binary candidates. The detections demonstrate the benefits of using the difference-imaging light curves, especially when going to fainter magnitudes.Peer reviewe

Powerful Winds from Low-Mass Stars: V374 Peg

The rapid rotation (P=0.44 d) of the M dwarf V374Peg (M4) along with its intense magnetic field point toward magneto-centrifugal acceleration of a coronal wind. In this work, we investigate the structure of the wind of V374Peg by means of 3D magnetohydrodynamical (MHD) numerical simulations. For the first time, an observationally derived surface magnetic field map is implemented in MHD models of stellar winds for a low mass star. We show that the wind of V374Peg deviates greatly from a low-velocity, low-mass-loss rate solar-type wind. We find general scaling relations for the terminal velocities, mass-loss rates, and spin-down times of highly magnetized M dwarfs. In particular, for V374Peg, our models show that terminal velocities across a range of stellar latitudes reach ~(1500-2300) n_{12}^{-1/2} km/s, where n_{12} is the coronal wind base density in units of 10^{12} cm^{-3}, while the mass-loss rates are about 4 x 10^{-10} n_{12}^{1/2} Msun/yr. We also evaluate the angular-momentum loss of V374Peg, which presents a rotational braking timescale ~28 n_{12}^{-1/2} Myr. Compared to observationally derived values from period distributions of stars in open clusters, this suggests that V374Peg may have low coronal base densities (< 10^{11} cm^{-3}). We show that the wind ram pressure of V374Peg is about 5 orders of magnitude larger than for the solar wind. Nevertheless, a small planetary magnetic field intensity (~ 0.1G) is able to shield a planet orbiting at 1 AU against the erosive effects of the stellar wind. However, planets orbiting inside the habitable zone of V374Peg, where the wind ram pressure is higher, might be facing a more significant atmospheric erosion. In that case, higher planetary magnetic fields of, at least, about half the magnetic field intensity of Jupiter, are required to protect the planet's atmosphere.Comment: 13 pages, 5 figures, 1 table. MNRAS in pres

Four ultra-short period eclipsing M-dwarf binaries in the WFCAM Transit Survey

We report on the discovery of four ultra-short period (P<0.18 days) eclipsing M-dwarf binaries in the WFCAM Transit Survey. Their orbital periods are significantly shorter than of any other known main-sequence binary system, and are all significantly below the sharp period cut-off at P~0.22 days as seen in binaries of earlier type stars. The shortest-period binary consists of two M4 type stars in a P=0.112 day orbit. The binaries are discovered as part of an extensive search for short-period eclipsing systems in over 260,000 stellar lightcurves, including over 10,000 M-dwarfs down to J=18 mag, yielding 25 binaries with P<0.23 days. In a popular paradigm, the evolution of short period binaries of cool main-sequence stars is driven by loss of angular momentum through magnetised winds. In this scheme, the observed P~0.22 day period cut-off is explained as being due to timescales that are too long for lower-mass binaries to decay into tighter orbits. Our discovery of low-mass binaries with significantly shorter orbits implies that either these timescales have been overestimated for M-dwarfs, e.g. due to a higher effective magnetic activity, or that the mechanism for forming these tight M-dwarf binaries is different from that of earlier type main-sequence stars.Comment: 22 pages, 17 figures, 3 tables Accepted for publication in MNRA

INFORMACIÓN AL USUARIO SOBRE LOS PROCEDIMIENTOS REALIZADOS POR EL PERSONAL DE ENFERMERÍA.

INTRODUCTION: The role of the professional of nursery compromised with the excellence on giving care competent of quality to the population user in the institutions of health is to provide information during the procedures that it realizes, and facilitates the acceptance and the fulfilment of the treatment. OBJETIVE: To identify the participation of nursery on the information that grants the users on having realized procedures and ministration of medicines. MATERIAL AND METHOD: Descriptive study elaborated in August and September 2004, the size of the sample was 43 adults users, in the services of internal medicine, gynaecology and surgery, in the shifts morning and vespertine of the Hospital Genreal Regional N°1 of IMSS. The information was gathered across a direct interview to the wer loy a constructed form with 16 items of multiple options,using for it´s measuring the categories: always, sometimes, never and doesn´t apply, the content of the instrument was valited by experts. For the analysis is used the arithmetic mean, frecuency and percentage. RESULTS: The nurse takes part giving information in them following procedures: capture of vital signs always77%, results of the vital signs always68%, venopunción always79% , Taken care of the venopunción always 74% , ministration of medicines :medicine name’s always 42%, possible allergies , interaction and contraindications always 39 % , in the signs of the alarm of the injuries always 30%. CONCLUSIONS: The obtained results reflect that the nurse if it informs the users in the procedures that it realizes, the service that less reports is a surgery and the fact that more it reports it is gynaecology.INTRODUCCIÓN: El papel del profesional de enfermería comprometido con la excelencia al brindar cuidados competentes de calidad a la población usuaria en las instituciones de salud, le proporcionan información durante los procedimientos que realiza y facilita la aceptación y el cumplimiento del tratamiento. OBJETIVO: Identificar la participación de Enfermería sobre la información que otorga a los usuarios al realizar procedimientos y administración de medicamentos. MATERIAL Y MÉTODO: Estudio descriptivo elaborado en los meses de Agosto y Septiembre de 2004, el tamaño de la muestra fue de 43 usuarios adultos hospitalizados en los servicios de Medicina Interna, Ginecología y Cirugía, en los turnos matutino y vespertino del Hospital General Regional N°1 del IMSS. La información se recolectó a través de una entrevista directa al usuario con un formulario estructurado con 16 ítems de opción múltiple, utilizando para su medición las categorías siempre, algunas veces, nunca y no aplica, el contenido del instrumento fue validado por expertos. Para el análisis de los resultados se utiliza frecuencia y porcentaje. RESULTADOS: La enfermera participa dando información en los siguientes procedimientos: toma de signos vitales siempre 77%, resultado de los signos vitales siempre 68%; venopunción siempre 79%, cuidados de la venopunción siempre 74%; procedimiento de curaciones siempre 49%, signos de alarma de la lesión siempre 30%; administración de medicamentos: sobre el nombre del medicamento siempre 42%, posibles alergias, interacciones y contraindicaciones siempre 39%. CONCLUSIONES: Los resultados obtenidos reflejan que la enfermera informa a los usuarios en los procedimientos que realiza siempre en un 43%, en el servicio que menos informa es cirugía y el que más informa es ginecología