Jack Bailey: A Texas Drover\u27s Diary, 1868

Introduction: In the late nineteenth century, thousands sought adventure and fortune on the cattle trails. Unfortunately, few committed their experiences to writing. The journal of Jack Bailey, which records the activities of a Texas cowboy from August 5 to November 8, 1868, is the earliest known daily account of life on the trail in the years following the Civil War. [Note: materially originally published by David Dary (ed.) in A Texas Cowboy\u27s Journal: Up the Trail to Kansas in 1868

The ALMA Early Science View of FUor/EXor objects. IV. Misaligned Outflows in the Complex Star-forming Environment of V1647 Ori and McNeil's Nebula

We present Atacama Large Millimeter/sub-millimeter Array (ALMA) observations of the star-forming environment surrounding V1647 Ori, an outbursting FUor/EXor pre-MS star. Dust continuum and the (J = 2 - 1) $^{12}$CO, $^{13}$CO, C$^{18}$O molecular emission lines were observed to characterize the V1647 Ori circumstellar disc and any large scale molecular features present. We detect continuum emission from the circumstellar disc and determine a radius r = 40 au, inclination i = 17$^{\circ}$$^{+6}_{-9}$ and total disc mass of M$_{\mathrm{disk}}$ of ~0.1 M$_{\odot}$. We do not identify any disc structures associated with nearby companions, massive planets or fragmentation. The molecular cloud environment surrounding V1647 Ori is both structured and complex. We confirm the presence of an excavated cavity north of V1647 Ori and have identified dense material at the base of the optical reflection nebula (McNeil's Nebula) that is actively shaping its surrounding environment. Two distinct outflows have been detected with dynamical ages of ~11,700 and 17,200 years. These outflows are misaligned suggesting disc precession over ~5500 years as a result of anisotropic accretion events is responsible. The collimated outflows exhibit velocities of ~2 km s$^{-1}$, similar in velocity to that of other FUor objects presented in this series but significantly slower than previous observations and model predictions. The V1647 Ori system is seemingly connected by an "arm" of material to a large unresolved structure located ~20$"$ to the west. The complex environment surrounding V1647 Ori suggests it is in the early stages of star formation which may relate to its classification as both an FUor and EXor type object.Comment: 18 pages, 14 figures, 4 tables; accepted for publication in MNRA

The ALMA Early Science View of FUor/EXor Objects - V. Continuum Disc Masses and Sizes

Low-mass stars build a significant fraction of their total mass during short outbursts of enhanced accretion known as FUor and EXor outbursts. FUor objects are characterized by a sudden brightening of ∼5 mag at visible wavelengths within 1 yr and remain bright for decades. EXor objects have lower amplitude outbursts on shorter time-scales. Here we discuss a 1.3 mm Atacama Large Millimeter/submillimeter Array (ALMA) mini-survey of eight outbursting sources (three FUors, four EXors, and the borderline object V1647 Ori) in the Orion Molecular Cloud. While previous papers in this series discuss the remarkable molecular outflows observed in the three FUor objects and V1647 Ori, here we focus on the continuum data and the differences and similarities between the FUor and EXor populations. We find that FUor discs are significantly more massive (∼80–600 MJup) than the EXor objects (∼0.5–40 MJup). We also report that the EXor sources lack the prominent outflows seen in the FUor population. Even though our sample is small, the large differences in disc masses and outflow activity suggest that the two types of objects represent different evolutionary stages. The FUor sources seem to be rather compact (Rc \u3c 20–40 au) and to have a smaller characteristic radius for a given disc mass when compared to T Tauri stars. V1118 Ori, the only known close binary system in our sample, is shown to host a disc around each one of the stellar components. The disc around HBC 494 is asymmetric, hinting at a structure in the outer disc or the presence of a second disc

Tous connectés - Une App pour gérer vos études en France

Dans internet existent beaucoup de sites qui offrent des services de documentation pour les études à l'étranger dans les pays francophones. Notre service est conçu pour les personnes qui veulent étudier en France. Toutefois, il n'y a pas un programme ou application qui est à ceux-là mêmes qui sont intéressés à ce pays, et pour effectuer ces procédures il est nécessaire pour eux de faire un long processus dans tout site Web, ou dans le pire des cas, ils doivent se déplacer physiquement à une agence pour recevoir des conseils sur leur voyage ou études. Le but de ce travail est de proposer une App innovatrice qui permet aux élèves de faire des recherches et d'accélérer leurs processus de documentation et de voyages pour leurs études à l'étranger dans un seul endroit.CHAPITRE 1 Introduction Introduction à l'étude Énoncé du problème Formulation du problème Justification du travail de recherche Question de recherche et objectifs CHAPITRE 2 Cadre théorique et état de l'art Introduction au chapitre Cadre théorique Neuromarketing La mobilité académique Procédures consulaires Technologie État de l'art CHAPITRE 3 Conception de la recherche Introduction au chapitre Type d'étude Contexte Participants Instruments de collecte de données CHAPITRE 4 Conclusions Introduction au chapitre Comparaison du travail de recherche avec les études précédentes Importance du travail de recherche Limites de l’étude Projections de la recherche RéférencesPregradoProfesional en Lenguas ModernasLenguas Moderna

ALMA observations of Elias 2–24: a protoplanetary disk with multiple gaps in the Ophiuchus molecular cloud

We present ALMA 1.3 mm continuum observations at 0. 2 (25 au) resolution of Elias 2–24, one of the largest and brightest protoplanetary disks in the Ophiuchus Molecular Cloud, and we report the presence of three partially resolved concentric gaps located at ∼20, 52, and 87 au from the star. We perform radiative transfer modeling of the disk to constrain its surface density and temperature radial profile and place the disk structure in the context of mechanisms capable of forming narrow gaps such as condensation fronts and dynamical clearing by actively forming planets. In particular, we estimate the disk temperature at the locations of the gaps to be 23, 15, and 12 K (at 20, 52, and 87 au, respectively), very close to the expected snowlines of CO (23–28 K) and N2 (12–15 K). Similarly, by assuming that the widths of the gaps correspond to 4–8× the Hill radii of forming planets (as suggested by numerical simulations), we estimate planet masses in the range of 0.2 1.5 – MJup, 1.0 8.0 – MJup, and 0.02 0.15 – MJup for the inner, middle, and outer gap, respectively. Given the surface density profile of the disk, the amount of “missing mass” at the location of each one of these gaps (between 4 and 20 MJup) is more than sufficient to account for the formation of such planets.Fil: Cieza, Lucas A.. Universidad Diego Portales; ChileFil: Casassus, Simon. Universidad de Chile; ChileFil: Pérez, Sebastian. Universidad de Chile; ChileFil: Hales, Antonio. Alma Observatory; ChileFil: Cárcamo, Miguel. Universidad de Chile; ChileFil: Ansdell, Megan. University of California at Berkeley; Estados UnidosFil: Avenhaus, Henning. Universitat Zurich; SuizaFil: Bayo, Amelia. Universidad de Valparaiso; ChileFil: Bertrang, Gesa H.-M.. Universidad Diego Portales; ChileFil: Cánovas, Hector. Agencia Espacial Europea; EspañaFil: Christiaens, Valentin. Universidad de Chile; ChileFil: Dent, William. Alma Observatory; ChileFil: Ferrero, Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Olofsson, Johan. Universidad de Valparaiso; ChileFil: Orcajo, Santiago. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Osses, Axel. Universidad de Chile; ChileFil: Peña Ramirez, Karla. Universidad de Antofagasta; ChileFil: Principe, David. Massachusetts Institute of Technology; Estados UnidosFil: Ruíz Rodríguez, Dary. Rochester Institute Of Technology; Estados UnidosFil: Schreiber, Matthias R.. Universidad de Valparaiso; ChileFil: Plas, Gerrit van der. Univ. Grenoble Alpes; SuizaFil: Williams, Jonathan P.. Institute For Astronomy, University Of Hawaii; Estados UnidosFil: Zurlo, Alice. Universidad Diego Portales; Chil

The Ophiuchus DIsc Survey Employing ALMA (ODISEA). II. The effect of stellar multiplicity on disc properties

We present Adaptive Optics (AO) near infrared (NIR) observations using VLT/NACO and Keck/NIRC2 of ODISEA targets. ODISEA is an ALMA survey of the entire population of circumstellar discs in the Ophiuchus molecular cloud. From the whole sample of ODISEA we select all the discs that are not already observed in the NIR with AO and that are observable with NACO or NIRC2. The NIR-ODISEA survey consists of 147 stars observed in NIR AO imaging for the first time, as well as revisiting almost all the binary systems of Ophiuchus present in the literature (20 out of 21). In total, we detect 20 new binary systems and one triple system. For each of them we calculate the projected separation and position angle of the companion, as well as their NIR and millimeter flux ratios. From the NIR contrast we derived the masses of the secondaries, finding that 9 of them are in the sub-stellar regime (30-50 \MJup). Discs in multiple systems reach a maximum total dust mass of $\sim$ 50 M$_{\oplus}$, while discs in single stars can reach a dust mass of 200 M$_{\oplus}$. Discs with masses above 10 M$_{\oplus}$ are found only around binaries with projected separations larger than $\sim$ 110 au. The maximum disc size is also larger around single star than binaries. However, since most discs in Ophiuchus are very small and low-mass, the effect of visual binaries is relatively weak in the general disc population.Comment: 13 pages, 13 figures, 4 tables. Published in MNRA

Planteamiento estratégico de Responsabilidad Social para la Empresa la Casita de la Mazorca

El concepto de la responsabilidad social empresarial moderna viene tomando fuerza desde la creación de entes internacionales que regulan el trabajo, los derechos fundamentales, el cuidado del medio ambiente y las demás políticas sociales, como lo son la OIT, la ONU, la ISO, la declaración de derechos humanos, la sostenibilidad ambiental y demás iniciativas que buscan garantizar los derechos de la población y que las empresas retribuyan un poco al entorno social y medioambiental, considerando la cantidad de recursos que consumen y las emisiones que generan en el desarrollo de su actividad económica. En el presente trabajo se diagnosticaran y se formularan estrategias de mejora de la gestión que realiza La casita de la mazorca en cuanto a la implementación de programas de responsabilidad social dentro y fuera de la organización, del cuidado del medio ambiente, la convivencia laboral y la divulgación de resultados y rendiciones de cuentas que muestran la buena fe y transparencia con la que opera la organización; permitiéndole ganar buen posicionamiento en el mercado en el que se desenvuelve. Dicho análisis se realiza mediante la revisión documental de informes, reglamentos internos y políticas adoptadas por la organización, así como también la aplicación de un instrumento de recolección de información, como lo es la encuesta la cual nos permite analizar los diferentes datos y también de la percepción que tienen los trabajadores y colaboradores del accionar y las políticas de la empresa.The concept of modern corporate social responsibility has been gaining strength since the creation of international entities that regulate work, fundamental rights, care for the environment and other social policies, such as the ILO, the UN, the ISO, the declaration of human rights, environmental sustainability and other initiatives that seek to guarantee the rights of the population and that companies give back a little to the social and environmental environment, considering the amount of resources they consume and the emissions they generate in the development of their activity economic. In the present work, strategies will be diagnosed and formulated to improve the management carried out by La casita de la mazorca in terms of the implementation of social responsibility programs inside and outside the organization, care for the environment, work coexistence and the disclosure of results and accountability that show the good faith and transparency with which the organization operates; allowing it to gain a good position in the market in which it operates. Said analysis is carried out through the documentary review of reports, internal regulations and policies adopted by the organization, as well as the application of an information collection instrument, such as the survey, which allows us to analyze the different data and also the perception that workers and collaborators have of the company's actions and policies