Spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko from the OSIRIS instrument onboard the ROSETTA spacecraft

Context. The Rosetta mission of the European Space Agency has been orbiting the comet 67P/Churyumov-Gerasimenko (67P) since August 2014 and is now in its escort phase. A large complement of scientific experiments designed to complete the most detailed study of a comet ever attempted are onboard Rosetta. Aims. We present results for the photometric and spectrophotometric properties of the nucleus of 67P derived from the OSIRIS imaging system, which consists of a Wide Angle Camera (WAC) and a Narrow Angle Camera (NAC). The observations presented here were performed during July and the beginning of August 2014, during the approach phase, when OSIRIS was mapping the surface of the comet with several filters at different phase angles (1.3 degrees-54 degrees). The resolution reached up to 2.1 m/px. Methods. The OSIRIS images were processed with the OSIRIS standard pipeline, then converted into I/F. radiance factors and corrected for the illumination conditions at each pixel using the Lommel-Seeliger disk law. Color cubes of the surface were produced by stacking registered and illumination-corrected images. Furthermore, photometric analysis was performed both on disk-averaged photometry in several filters and on disk-resolved images acquired with the NAC orange filter, centered at 649 ran, using Hapke modeling. Results. The disk-averaged phase function of the nucleus of 67P shows a strong opposition surge with a G parameter value of -0.13 +/- 0.01 in the HG system formalism and an absolute magnitude H-v(1, 1, 0) = 15.74 +/- 0.02 mag. The integrated spectrophotometry in 20 filters covering the 250-1000 nm wavelength range shows a red spectral behavior, without clear absorption bands except for a potential absorption centered at similar to 290 rim that is possibly due to SO2 ice. The nucleus shows strong phase reddening, with disk-averaged spectral slopes increasing from 11%/( 100 nm) to 16%/(100 nm) in the 1.3 degrees-54 degrees phase angle range. The geometric albedo of the comet is 6.5 +/- 0.2% at 649 nm, with local variations of up to similar to 16% in the Hapi region. From the disk-resolved images we computed the spectral slope together with local spectrophotometry and identified three distinct groups of regions (blue, moderately red, and red). The Hapi region is the brightest, the bluest in term of spectral slope, and the most active surface on the comet. Local spectrophotometry shows an enhancement of the flux in the 700-750 nm that is associated with coma emissions.

Feasibility of stereotactic MRI-based image guidance for the treatment of vascular malformations: a phantom study.

PURPOSE Treatment of vascular malformations requires the placement of a needle within vessels which may be as small as 1 mm, with the current state of the art relying exclusively on two-dimensional fluoroscopy images for guidance. We hypothesize that the combination of stereotactic image guidance with existing targeting methods will result in faster and more reproducible needle placements, as well as reduced radiationexposure, when compared to standard methods based on fluoroscopy alone. METHODS The proposed navigation approach was evaluated in a phantom experiment designed to allow direct comparison with the conventional method. An anatomical phantom of the left forearm was constructed, including an independent control mechanism to indicate the attainment of the target position. Three interventionalists (one inexperienced, two of them frequently practice the conventional fluoroscopic technique) performed 45 targeting attempts utilizing the combined and 45 targeting attempts utilizing the standard approaches. RESULTS In all 45 attempts, the users were able to reach the target when utilizing the combined approach. In two cases, targeting was stopped after 15 min without reaching the target when utilizing only the C-arm. The inexperienced user was faster when utilizing the combined approach and applied significantly less radiation than when utilizing the conventional approach. Conversely, both experienced users were faster when using the conventional approach, in one case significantly so, with no significant difference in radiation dose when compared to the combined approach. CONCLUSIONS This work presents an initial evaluation of a combined navigation fluoroscopy targeting technique in a phantom study. The results suggest that, especially for inexperienced interventionalists, navigation may help to reduce the time and the radiation dose. Future work will focus on the improvement and clinical evaluation of the proposed method.

Safe abortion: technical and policy guidance for health systems

Esta 2da edición de la Guía recoge la última evidencia disponible no sólo respecto de la atención del aborto seguro sino también de cómo deben organizarse los recursos humanos, los insumos y las instituciones de salud para garantizar los derechos humanos, incluyendo los derechos sexuales y reproductivos de las mujeres.

Practice advisory: interim guidance for care of obstetric patients during a zika virus outbreak

Zika during pregnancy has been associated with birth defects, specifically significant microcephaly. Transmission of Zika to the fetus has been documented in all trimesters; Zika virus RNA has been detected in fetal tissue from early missed abortions, amniotic fluid, term neonates and the placenta. However, much is not yet known about Zika virus in pregnancy. Uncertainties include the incidence of Zika virus infection among pregnant women in areas of Zika virus transmission, the rate of vertical transmission and the rate with which infected fetuses manifest complications such as microcephaly or demise. The absence of this important information makes management and decision making in the setting of potential Zika virus exposure (i.e. travel to endemic areas) or maternal infection, difficult. Currently, there is no vaccine or treatment for this infection.

The XXI century guidance and its social responsibility

El presente trabajo tiene como finalidad considerar la orientación del siglo XXI en Venezuela como una disciplina con un alto compromiso social. Como programa, debe, hoy día, redefinirse con el objeto de impulsar propuestas conducentes a la inclusión de todas aquellas personas, que tradicionalmente han sido excluidas por su raza, etnia, género y/o discapacidad física y que como praxis social esté dirigida a la facilitación de los procesos de desarrollo humano en las dimensiones del Ser, Convivir, Servir, Conocer y Hacer, en el contexto personal, familiar y comunitario a lo largo del continuo del ciclo vital. L as competencias adquiridas a través de los procesos de orientación, son determinantes para proporcionar los medios a las ciudadanas y los ciudadanos para gestionar su propio desarrollo y el de su comunidad Se plantea la necesidad de un cambio de paradigma que deje atrás la clásica postura de un orientador que ayuda al orientado, desde el que conoce, el que tiene experiencia. Se sugiere más bien una relación de orientación intersubjetiva. Por otra parte, se habla de la necesidad de fortalecer el capital social de los espacios que contextualizan el proceso orientador. Se explican además, los alcances del Sistema Nacional de Orientación.

Equity and guidance : The challenge of a proposal

La presente propuesta corresponde a un proyecto de extensión universitaria, acreditado y subsidiado por la Secretaría de Extensión Universitaria de la Universidad Nacional de La Plata. Este plan de trabajo interinstitucional e interdisciplinario formó parte de una de las acciones de transferencia de nuestro último proyecto de investigación denominado La Orientación Vocacional Ocupacional en escuelas denominadas de alta vulnerabilidad psicosocial.

Career guidance in Denmark : Social control in a velvet glove

La Orientación Vocacional en Dinamarca está bien organizada y es altamente profesional. Esto refleja una política orientadora centrada en el papel que la orientación juega como instrumento en el ejercicio de un leve control social. Con este telón de fondo, el dilema de la Orientación en Dinamarca reside en el delicado equilibrio existente entre la orientación considerada como una herramienta para el desarrollo personal, y como un instrumento de control social.

Vocational guidance in people with special educational needs as the result of visual impairment during the transition stage from high school to advanced education

This work proposes to seek for the factors related to the choices that people with special educational needs make as the result of the visual impairment, during the transition stage from high school to advanced education. Therefore, we have taken into consideration that Vocational Guidance and the transition towards adulthood get specific characteristics in case of visually impaired young people, particularly in what's related to continue with advanced education. The focus of this work is to be able to clarify the existence of factors that make this transition stage easier or harder, through the observation of visually impaired and blind people who complete high school. This matter has aroused interest and concern about the strategies to follow to ensure the successful entrance and remaining in the selected advanced education. However, if we don?t know the factors involved in the described fact, it's difficult to design an appropriate intervention strategy. Then, in order to take acknowledge about the specific issues of visually impaired young people who complete high school, we chose a special school for this disability and some students who will join this project

Career guidance in Quebec, Canadá

First, the guidance counselor profession in the province of Quebec will be described: the professional association to which it belongs, the required in- struction, the counselors' tasks and the institutions for which they work. There follows the description of the main current tendencies in career guidance devel- opment in this French-speaking area of Canada with about 7.2 million inhabit- ants, approximately one fourth of the total country population. Finally, a brief description of the Center for Research on Education and Labor of the University of Shebrooke as well as of some instruments that one of the teams is constructing will be provided.

Model of ICT skills and new professional profile of the Guidance Counsellors in some European countries

El artículo analiza la utilización de las Tecnologías de la Información y Comunicación en el escenario de algunos países europeos en el ámbito de la Orientación Educativa y Profesional.

Equity and Guidance : The challenge of following up young graduates

In this paper we present a support strategy of guidance for the young people from vulnerable population, both urban and rural, who have completed high school and are involved in an extension program so called Equity and guidance: the challenge of a proposal in state educational institutions from the La Plata, Berisso and Ensenada districts. This program gives them a reflection space to analyze their personal, social and community situation as a self-managed process towards a project of life. For some time we have supported young people with the purpose of helping them to make a life project. When doing so, we've always noticed the need of finding strategies to provide reasons to carry on the project of completing high school, to search new knowledge, request scholarships, to think of alternatives according to their circumstances, etc. In this sense, the Project: ?Equity and Guidance: the challenge of following up young graduates? is a revealing experience since it shows the urgent need to provide real means to enable communities we work with to make the most of opportunities. For the young people who belong to a vulnerable community, a project of life doesn't mean just thinking of the choice of careers, trainings or jobs. It also means to find how to make it possible in their daily life. Everything we make, think and manage in this project has the same purpose: help them so they can make a life project according to their subjectivity