Path coverings with prescribed ends in faulty hypercubes

We discuss the existence of vertex disjoint path coverings with prescribed ends for the $n$-dimensional hypercube with or without deleted vertices. Depending on the type of the set of deleted vertices and desired properties of the path coverings we establish the minimal integer $m$ such that for every $n \ge m$ such path coverings exist. Using some of these results, for $k \le 4$, we prove Locke's conjecture that a hypercube with $k$ deleted vertices of each parity is Hamiltonian if $n \ge k +2.$ Some of our lemmas substantially generalize known results of I. Havel and T. Dvo\v{r}\'{a}k. At the end of the paper we formulate some conjectures supported by our results.Comment: 26 page

Conocimiento didáctico del contenido de los profesores de tecnología que participan en la red virtual de aprendizaje - REDOTIC

El proyecto de tesis doctoral, pretende describir, interpretar y analizar las características del conocimiento didáctico del contenido de los profesores de tecnología que hacen parte de la red virtual de aprendizaje REDOTIC. La pregunta de investigación ¿Cuáles son las características del conocimiento didáctico del contenido, de los profesores de tecnología que participan en redes virtuales de aprendizaje?. Esta línea de investigación sobre el conocimiento de los profesores de tecnología es nueva en Colombia y pretende reafirmar una categoría de conocimiento exclusiva de los profesores, que apoya las reivindicaciones de profesionalización de la docencia y que en la enseñanza de las ciencias, ha generado gran número de investigaciones en diversas líneas, que ayudan a iluminar el campo del saber necesario para enseñar tecnología

Classification of air masses that affect the south of Santa Fe, their trajectories and the relationship between them to the the daily precipitation in January

El objetivo del trabajo es identificar las masas de aire que afectan el sur de Santa Fe durante los eneros de 1998-2006 y relacionarlas con la precipitación diaria, tomando como estación representativa a Zavalla (33º01´S, 60º53´O). La información diaria analizada es: temperaturas media, máxima y mínima, humedad relativa, heliofanía efectiva, presión atmosférica, precipitación y dirección de viento a las 8 y 14 horas local, campos de altura geopotencial en 1000 y 500 hPa, de temperatura en 1000 hPa y de humedad específica en 850 hPa del NCEP. Se aplica el algoritmo K-means y se identifican cuatro tipos de masas de aire: Cálida Seca (mCS): muy cálida; Cálida Húmeda (mCH): aumenta significativamente la humedad y la nubosidad respecto a mCS; Templada Seca (mTS): menores temperaturas mínimas; Templada Húmeda (mTH): muy húmeda, y bajas amplitudes térmicas diarias, asociada a condiciones previas al pasaje de frentes fríos. El 50% de días lluviosos ocurren durante mCH y el 32% con mTH, y el 93% de las más intensas acontecen durante el predominio de dichas masas. Las mTH tienen mayor eficiencia en la ocurrencia de precipitación pues en el 50% de los casos precipita, y para las mCH solo en el 27%.The aim of this work is to identify the air masses that affect the south of Santa Fe in January during 1998-2006 and to relate it to the daily precipitation, in Zavalla (33º01´S, 60º53´O). The analyzed daily information is: mean, maximum and minimum temperature, relative humidity, effective insolation, atmospheric pressure, precipitation and wind direction of the 8 and 14 hours. The fields of circulation and temperature in 1000 and 500 hPa, and specific humidity in 850 hPa, are calculated using NCEP Reanálisis data. Analysis of cluster k-means is applied and it determines four types of air masses: Warm Drought: a very warm air mass; Warm Humid: it increases the humidity and cloudiness, Moderate Dry: air mass with the smallest minimum temperatures; Moderate Humid: very humid air mass, daily losses thermal amplitude, associated to the previous conditions to the passage of cold fronts. The 50% of the precipitation days happen during Warm Humid masses and the 32% with Moderate Humid, and 93% of the most intense occurs during these masses. Moderate Humid have major efficiency in the precipitation occurrence because in 50% of the cases precipitates, and for Warm Humid only in 27%.Fil: Coronel, Alejandra S.. Universidad Nacional de Rosario. Facultad de Ciencias Agrarias; ArgentinaFil: Castañeda, Maria Elizabeth. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

The Agua Prieta Powerhouse Slope Instability

The slope instability that endangered seriously the powerhouse of the Aqua Prieta Hydroelectric Project and involved about one million cubic meters of soils and breccias is described. The evolution of the geotechnical instrumentation measurements done from October 1987 to date, the geomechanic analysis performed and the stabilization works are discussed

How Do You Build a "Culture of Health"? A Critical Analysis of Challenges and Opportunities from Medical Anthropology.

The Robert Wood Johnson Foundation's Culture of Health Action Framework aims to "make health a shared value" and improve population health equity through widespread culture change. The authors draw upon their expertise as anthropologists to identify 3 challenges that they believe must be addressed in order to effectively achieve the health equity and population health improvement goals of the Culture of Health initiative: clarifying and demystifying the concept of "culture," contextualizing "community" within networks of power and inequality, and confronting the crises of trust and solidarity in the contemporary United States. The authors suggest that those who seek to build a "Culture of Health" refine their understanding of how "culture" is experienced, advocate for policies and practices that break down unhealthy consolidations of power, and innovate solutions to building consensus in a divided nation

Soil investigation using a participative approach for agri-environmental improvement in Monegros, Spain

5 Pags.- 1 Tabl.- 2 Figs.The saline wetlands of the Monegros Desert, in the center of the Ebro Basin (NE Spain), host valuable biodiversity and pedodiversity. A part of this area has been proposed for inclusion in the Natura 2000 E. U. Network. However, agricultural intensification is changing the area as more land is consolidated for new irrigation or is plowed to obtain CAP (Common Agricultural Policy) subsides. Soil mapping is needed to assist in the delimitation of natural habitats and make conservation compatible with agriculture. The methodology presented here to characterize agri-environmental areas takes into account current agricultural and environmental practices. The approach was participative, asking the opinion of farmers and agricultural and environmental officers about a new agrienvironmental measure which could be proposed to the Rural Development section of the CAP The measure would economize agriculture inputs in unproductive areas and also meet nature conservation purposes. A GIS data base was built for selecting the farming plots suitable for new agricultural practices favoring biodiversity and pedodiversity. At the local scale, we used remote sensing and pedodiversity criteria for selecting low productive areas to be prospected. The opinion po!! resulted in a positive response, with a 67% of the managed surface favoring a new CAP measure compatible with nature conservation. The po!! corifirmed the interest of thefarmers in having detailed maps of the soil features that limit crop production.MEC and FEDER funded this work within the Project AGL2006-01283.Peer reviewe