Manual de seguridad en el almacenamiento y manipulación de productos químicos. Propuesta de diseño e implementación.

La realización de las Prácticas Externas en las cuales me he desempeñado, se basaron en el diseño, desarrollo y planificación tanto de los contenidos, como la metodología adecuada para la implementación de una Guía o Manual, para la prevención de riesgos laborales a ser implementada en el Almacén de Productos Químicos de la Universidad de Valladolid, (en adelante UVa). La misma obedeció a la necesidad de garantizar las condiciones de seguridad de las personas y los bienes, que pudieren ser afectados por una inadecuada utilización del Almacén de Productos Químicos de la UVa, así como garantizar el cuidado del medio ambiente. Para la realización de este trabajo se consideró toda la normativa específica aplicable.Departamento de Ingeniería Química y Tecnología del Medio AmbienteMáster en Gestión de la Prevención de Riesgos Laborales, Calidad y Medio Ambient

Letter to the editor

A response to Dango S, Lin R, Hennings E, Passlick B. Initial experience with a synthetic sealant PleuraSeal™ after pulmonary resections: a prospective study with retrospective case matched controls. Journal of Cardiothoracic Surgery 2010, 5:50

Spiders of soybean crops in Santa Fe Province, Argentina: Influence of surrounding spontaneous vegetation on lot colonization

Trials during two consecutive soybean cycles were performed in central Santa Fe in order to determine the main spider families present in the crop and to determine the influence of spontaneous margin flora on colonization towards the lot. Samplings were done by sweeping net and pitfall traps. It was concluded that: 1. Oxyopidae was the most frequent family in the herbaceous layer of both the margins and the soybean crop, and Lycosidae in the lower layer; 2. Margin strips in a soybean lot contribute to the colonization of the crop by spiders of aerial habits and also promote re-colonization following pesticide applications, since they act as shelters. The influence on spiders of terrestrial habits was somewhat lower; 3. The distribution of the populations of spiders of terrestrial habits was homogeneous in a soybean crop seeded directly and these predators had a greater capacity to control pests at all points of the lot.Centro de Estudios Parasitológicos y de Vectore

Modélisation et simulation des écoulements de contre-courant de l'hélium superfluide par la méthode Boltzmann sur réseau

The exceptional thermal properties of superfluid helium, or He-II, are exploited to the cryogenic refrigeration of high power installations, although the underlying physical mechanisms remain poorly understood. The He-II can be described macroscopically as the superposition of two fluids in interaction: a normal fluid behaves as an ordinary liquid, and a superfluid without viscosity. In the presence of a heat source, a counterflow established between these two components. The heat dissipation by this counterflow is limited by the occurrence of instabilities in misunderstood condition; the wide dispersion of experimental data does not allow to discriminate between the different theoretical models. This thesis examines using numerical simulations the role of boundary conditions and the mutual coupling between the two components of the He-II in triggering instabilities in counterflow.An innovative lattice Boltzmann type approach was developed to model the mesoscopic scale interaction between the two components of the He-II. A code reproducing counterflow in 2D and 3D conducts has been developed and validated. The results obtained indicate amplified entrance effects for superfluid component, which generate abnormally high pressure drops. The head of these entrance effects mechanism has been studied and it is shown that it can distort the detection of the transition threshold in too short pipes; This may partly explain the dispersion of experimental data.To illustrate the power of the approach in a complex geometry, the wake of an obstacle in a counterflow was simulated. The presence of recirculation areas on both sides of the obstacle, already observed experimentally, is found and explained by a new mechanism using "virtual walls".Les propriétés thermiques exceptionnelles de l’hélium superfluide, ou He-II, sont mises à profit pour la réfrigération cryogénique d'installations de forte puissance, bien que les mécanismes physiques sous-jacents restent mal compris. L’He-II peut être décrit à l’échelle macroscopique comme la superposition de deux fluides en interaction : un fluide normal se comportant comme un liquide ordinaire, et un superfluide sans viscosité. En présence d’une source de chaleur, un contre-courant s’établit naturellement entre ces deux composantes. L’évacuation de la chaleur par ce contre-courant est limitée par l’apparition d’instabilités dans des conditions mal comprises ; la grande dispersion des données expérimentales ne permettant pas de discriminer les différents modèles théoriques. Cette thèse examine à l’aide de simulations numériques le rôle des conditions aux bords et du couplage mutuel entre les deux composantes de l’He-II dans le déclenchement des instabilités de contre-courant.Une approche originale de type Boltzmann sur réseau a été développée pour modéliser à l’échelle mésoscopique l'interaction entre les deux composantes de l’He-II. Un code reproduisant les écoulements de contre-courant en conduite 2d et 3d a été développé et validé. Les résultats obtenus indiquent des effets d’entrée de conduite amplifiés pour la composante superfluide, qui engendrent des pertes de charge anormalement élevées. Le mécanisme responsable de ces effets d’entrée a été étudié et il est montré qu'il peut fausser la détection du seuil de transition dans des conduites trop courtes ; ceci peut expliquer en partie la dispersion des données expérimentales.Pour illustrer la puissance de l'approche dans une géométrie complexe, le sillage d'un obstacle dans un écoulement de contre-courant a été simulé. La présence de zones de recirculation des deux côtés de l’obstacle, déjà observée expérimentalement, est retrouvée et expliquée par un mécanisme original de parois virtuelles

An analysis of changes to transit accessibility and equity after the opening of a bus rapid transit system in Hartford, Connecticut

In March 2015, CTfastrak, a bus rapid transit system operating in Connecticut in the United States, opened after nearly 16 years of planning and controversy. The 15.1-km (9.4-mi) busway connects the town of New Britain to the state capital of Hartford. The analysis conducted in this paper investigates whether or not CTfastrak and the transit system restructuring that occurred between 2013 and 2016 improved overall transit accessibility in the region, and if so, whether or not the distribution of these improvements is equitable. This exploration provides strong evidence that overall transit accessibility has improved in the region. Horizontal, or spatial equity, did worsen slightly as a result of this highly localized project. However, vulnerable populations experience more improvements and fewer decreases in transit accessibility than the general population. Though these analyses seem promising, an analysis of the distribution of transit access among workers hints that while many people are experiencing increases in general accessibility, they may not have meaningful access to their place of employment

Pathophysiological mechanism of post-lobectomy air leaks

Background: Air leak post-lobectomy continues to remain a significant clinical problem, with upper lobectomy associated with higher air leak rates. This paper investigated the pathophysiological role of pleural stress in the development of post-lobectomy air leak.Methods: Preoperative characteristics and postoperative data from 367 consecutive video assisted thoracic surgery (VATS) lobectomy resections from one centre were collected prospectively between January 2014 and March 2017. Computer modelling of a lung model using finite element analysis (FEA) was used to calculate pleural stress in differing areas of the lung.Results: Air leak following upper lobectomy was significantly higher than after middle or lower lobectomy (6.3% versus 2.5%, P=0.044), resulting in a significant six-day increase in mean hospital stay, P=0.004. The computer simulation model of the lung showed that an apical bullet shape was subject to eightyfold higher stress than the base of the lung model.Conclusions: After upper lobectomy, the bullet shape of the apex of the exposed lower lobe was associated with high pleural stress, and a reduction in mechanical support by the chest wall to the visceral pleura due to initial post-op lack of chest wall confluence. It is suggested that such higher stress in the lower lobe apex explains the higher parenchymal air leak post-upper lobectomy. The pleural stress model also accounts for the higher incidence of right-sided prolonged air leak post-resection.peer-reviewe

Feminismos latinoamericanos ¿Movimiento social, espacio social, política del deseo o campo de acción?

Este artículo tiene como objetivo aportar una reflexión acerca del movimiento feminista en Latinoamérica, sus formas de organización política, estrategias y activismos. Con este propósito se reconstruirán brevemente los aportes de la escuela estadounidense y europea acerca de los movimientos sociales para luego poner el foco en los aportes latinoamericanos y, de manera más específica, en las contribuciones de las teorías feministas decoloniales y feminismos comunitarios. Asimismo, se recuperarán aportes conceptuales tales como espacio social, política del deseo y campos de acción para poner en tensión la noción misma de movimiento social y su pertinencia al referirnos a los plurales feminismos de la región. Se pretende establecer ciertas coordenadas que nos permitan situar el pensamiento y estudiar las características del movimiento feminista con sus particularidades del momento y sus continuidades históricas

POLÍTICAS PÚBLICAS PARA UNA POBLACIÓN VULNERABLE: EVALUACIÓN DEL PLAN “VUELVO A ESTUDIAR” EN ROSARIO, ARGENTINA

The aim of this research is to analyze and asses the implementation of the program called “Vuelvo a Estudiar”, managed by the government of the province of Santa Fe, at La Tablada. The above mention program is a comprehensive socio-educational policy, a drop-out recovery program developed, as a priority, in impoverished neighborhoods. It is also presented as policy instrument craftily developed and increasingly implemented according to the persons responsible for the field work and a network structure approach. The analysis is based on the policy network approach. It starts locally, taking into consideration the players, their relationship at field work, their instruments and backgrounds, as well as the interrelationship or tensions between their rationalities during the hands-on work.El presente trabajo de investigación propone un análisis y evaluación de la implementación del Plan “Vuelvo a Estudiar” de la provincia de Santa Fe en el Barrio La Tablada. El mismo, se presenta como una política socioeducativa inclusiva que pretende reinsertar escolarmente a jóvenes que hayan abandonado la escuela secundaria, circunscribiéndose en barrios vulnerables considerados como prioritarios. Asimismo, se plantea como un instrumento de política desarrollado artesanalmente e implementado de manera incremental de acuerdo a los responsables territoriales, y bajo una estructura en red. Para analizarlo, desarrollamos un estudio a partir del enfoque de policy network o gestión en redes partiendo desde lo local considerando a los diferentes actores, las relaciones entre los mismos en el territorio, sus instrumentos y saberes en juego como las racionalidades que se interrelacionan y/o tensionan en el momento de la puesta en práctica