Mi revista, nuestra revista, vuestra revista : La sierra digital.

Este proyecto de innovación educativa se presentó en el Congreso Internacional de Innovación en la Educación celebrado en Valladolid los días 26, 27 y 28 de abril de 2005

Los escolares ante las drogas : una aproximación ante la prevención.

Conocer más profundamente la incidencia y planteamientos que sobre la problemática de las drogas puede haber entre los escolares de Vizcaya. Tratar de conocer lo que piensan y sienten sobre las drogas los escolares de Vizcaya. Obtener una hipótesis que pueda orientar el análisis de la problemática de las drogas en estudios futuros. 798 alumnos de sexto a octavo de EGB de centros públicos y privados, utilizándose 90 para realizar el estudio, divididos en zonas geográficas y tipo de centro. En este estudio, primero, se tratan las ideas que han aportado diferentes autores y organismos, tanto nacionales como internacionales, sobre como llevar a cabo una prevención de las drogas en la escuela y hacia que puntos hay que dirigirse. En segundo lugar, obtener de todas estas teorías unos criterios e ideas comunes a todas ellas, para a continuación, analizar esos puntos concretos en la muestra y ver como responden a dichos aspectos los trabajos de redacción seleccionados. El tercer paso consiste en formular las hipótesis referentes a los aspectos de política preventiva de las drogas en el ámbito escolar. Redacción sobre las drogas. Análisis de contenido, que permite un conocimiento a la hora de reflejar actitudes, intereses y valores. Análisis informático mediante el programa World Star. Análisis de individuos zona geográfica y tipo de centro y de términos: conocimiento, entorno familiar, entorno escolar, entorno social y la salud. Se aprecia cierta consciencia de que el tabaco y el alcohol son drogas, aunque su valoración sea más bien neutral. Términos como cannabis o marihuana no parecen estar muy integrados en el conocimiento de estos individuos, si bien parecen conocer en cierta medida la cocaína. Parece que reconocen los disgustos y sufrimientos que el problema acarrea a la familia y en muy poca medida el papel que puede jugar la familia en la prevención del problema de las drogas. No se ha podido llegar a configurar la fuente de conocimiento a través de la cual los miembros del corpus han llegado a incluir en sus trabajos los términos que se han analizado y su valoración. Lo que sí se ha apreciado es que se establece una relación droga-alcohol y tabaco, es decir, tanto el alcohol como el tabaco son sustancias que son drogas para ellos.

Una ecolog??a organizacional para dirigir un agrupamiento escolar en Lisboa (Portugal) : aprendizajes y pr??cticas situacionalmente construidas

Resumen basado en el de la publicaci??n

Point sampling with uniformly distributed lines

In this paper we address the problem of extracting representative point samples from polygonal models. The goal of such a sampling algorithm is to find points that are evenly distributed. We propose star-discrepancy as a measure for sampling quality and propose new sampling methods based on global line distributions. We investigate several line generation algorithms including an efficient hardware-based sampling method. Our method contributes to the area of point-based graphics by extracting points that are more evenly distributed than by sampling with current algorithms

Mothers' verbal language to young hearing impaired children

This paper discusses the effect of a mother's language on the language development of her hearing impaired child.

La narrativa de los programas de farándula: el caso de Vamos con todo

El análisis de los programas televisivos sobre farándula ha sido abordado de manera tangencial por parte de las ciencias sociales. Las únicas referencias sobre el star system y el metarrelato del entretenimiento -nociones sin las que no podría trabajarse este tema- pueden hallarse en los trabajos de Gubern y Gabler -que a su vez han influenciado aquellos de Martín-Barbero y Rincón-, de allí que se vuelva pertinente aplicar estas propuestas a un producto específico de la industria del entretenimiento, en este caso los shows dedicados a la farándula. De este modo, el propósito de la investigación es adentrarse en el estilo narrativo de estos programas, haciendo uso de los aportes teóricos de los autores antes mencionados. Para ello se ha procedido a caracterizar los principales elementos del discurso y la narrativa de la televisión, así como del metarrelato del entretenimiento, la prensa del corazón y el star system, los que, a su vez, fueron contrastados con un análisis de contenido aplicado a la narrativa de “Vamos con todo”, uno de los programas emblemáticos de la prensa rosa nacional. Este ejercicio mostró en qué grado los programas de farándula se adecúan a los supuestos del discurso televisivo y a las reglas de la narrativa que utiliza la televisión, permitiendo, además, profundizar en la categoría de “formato” sobre la base de la definición previa de Rincón -el formato es la unidad de creación televisiva. No obstante, los resultados de la investigación permiten llegar a conclusiones más generales acerca de los presupuestos del metarrelato del entretenimiento y de la estructura de clase en la que se basa el star system.

Plant remains as evidence for seasonality of site use in the Mesolithic period

Attempts to identify the seasons during which Mesolithic sites may have been occupied have usually concentrated on evidence from faunal assemblages, while the potential of plant remains has been largely neglected. In this paper the use of plant remains as indicators of seasonality is discussed, especially where they represent the accidental charring of species unlikely to have been deliberately collected and stored. This is illustrated with reference to the early Mesolithic site of Star Carr, North Yorkshire, and discussed in the context of other Mesolithic sites from which assemblages of charred plant remains have been recovered.

From the sun to the Earth: The 13 May 2005 coronal mass ejection

We report the results of a multi-instrument, multi-technique, coordinated study of the solar eruptive event of 13 May 2005. We discuss the resultant Earth-directed (halo) coronal mass ejection (CME), and the effects on the terrestrial space environment and upper Earth atmosphere. The interplanetary CME (ICME) impacted the Earth’s magnetosphere and caused the most-intense geomagnetic storm of 2005 with a Disturbed Storm Time (Dst) index reaching −263 nT at its peak. The terrestrial environment responded to the storm on a global scale. We have combined observations and measurements from coronal and interplanetary remote-sensing instruments, interplanetary and near-Earth in-situ measurements, remote-sensing observations and in-situ measurements of the terrestrial magnetosphere and ionosphere, along with coronal and heliospheric modelling. These analyses are used to trace the origin, development, propagation, terrestrial impact, and subsequent consequences of this event to obtain the most comprehensive view of a geo-effective solar eruption to date. This particular event is also part of a NASA-sponsored Living With a Star (LWS) study and an on-going US NSF-sponsored Solar, Heliospheric, and INterplanetary Environment (SHINE) community investigation.

Strained relations: a critical analysis of the mining conflict in Prestea, Ghana

This paper examines the dynamics of the ongoing conflict in Prestea, Ghana, where indigenous galamsey mining groups are operating illegally on a concession awarded to Bogoso Gold Limited (BGL), property of the Canadian-listed multinational Gold Star Resources. Despite being issued firm orders by the authorities to abandon their activities, galamsey leaders maintain that they are working areas of the concession that are of little interest to the company; they further counter that there are few alternative sources of local employment, which is why they are mining in the first place. Whilst the Ghanaian Government is in the process of setting aside plots to relocate illegal mining parties and is developing alternative livelihood projects, efforts are far from encouraging: in addition to a series of overlooked logistical problems, the areas earmarked for relocation have not yet been prospected to ascertain gold content, and the alternative income-earning activities identified are inappropriate. As has been the case throughout mineral-rich sub-Saharan Africa, the conflict in Prestea has come about largely because the national mining sector reform program, which prioritizes the expansion of predominantly foreign-controlled large-scale projects, has neglected the concerns of indigenous subsistence groups.

'To move or not to move': Reflections on the resettlement of artisanal miners in the western region of Ghana

This article critically reflects upon the shortcomings of the 'Prestea Action Plan', an ambitious initiative undertaken to facilitate the resettlement of artisanal miners operating in the Western Region of Ghana. The aim of the exercise was to identify viable areas for the thousands of operators who were working illegally in the town of Prestea, an area under concession to the US-based multinational, Golden Star Resources Ltd. At the time of its launch, it was one of the few support initiatives to target artisanal miners, whose claims to land are generally not recognized by governments. It was a particularly significant exercise in Ghana because it suggested that the authorities, who traditionally have exercised a policy of non-negotiation with such groups, had finally recognized that dialogue was needed if the growing rift between the country's indigenous artisanal miners, foreign mining companies and government bodies was to be bridged. It soon emerged, however, that despite its commendable policy objectives, the Plan was fundamentally flawed-problems which would undermine the entire exercise.

Evidence for an inhibitory role of bone morphogenetic protein(s) in the follicular-luteal transition in cattle

Bone morphogenetic proteins (BMPs) and their receptors are expressed in ovarian theca cells (TC) and granulosa cells (GC) and BMPs have been implicated in the regulation of several aspects of follicle development including thecal androgen production and granulosal oestrogen production. Their potential involvement in luteal function has received less attention. in this study, we first compared relative abundance of mRNA transcripts for BMPs, activin-beta A and BMP/activin receptors in bovine corpus luteum (CL) and follicular theca and granulosa layers before undertaking functional in vitro experiments to test the effect of selected ligands (BMP6 and activin A) on luteinizing bovine TC and GC. Relative to P-actin transcript abundance, CL tissue contained more BMP4 and -6 mRNA than granulosa, more BMP2 mRNA than theca but much less activin-beta A mRNA than both granulosa and theca. Transcripts for all seven BMP/activin receptors were readily detected in each tissue and two transcripts (BMPRII, ActRIIA) were more abundant in CL than either theca or granulosa, consistent with tissue responsiveness. In vitro luteinization of TC and GC from antral follicles (4-6 mm) was achieved by culturing with 5% serum for 6 days. Treatment with BMP6 (0, 2, 10, and 50 ng/ml) and activin A (0, 2, 10 and 50 ng/ml) under these conditions dose-dependently suppressed forskolin-induced progesterone (P-4) secretion from both cell types without affecting cell number. BMP6 reduced forskolin-stimulated upregulation of STAR mRNA and raised 'basal' CYP17A1 mRNA level in theca-lutein cells without affecting expression of CYP11A1 or hydroxy-Delta-5-steroid dehydrogenase, 3 beta- and steroid Delta-isomerase 1 (HSD3B1). In granulosa-lutein cells, STAR transcript abundance was not affected by BMP6, whereas forskolin-induced expression of CYP11A1, HSD3B1, CYP19A1 and oxytocin transcripts was reduced. In both cell types, follistatin attenuated the suppressive effect of activin A and BMP6 on forskolin-induced P4 secretion but had no effect alone. Granulosa-lutein cells secreted low levels of endogenous activin A (similar to 1 ng/ml); BMP6 reduced this, while raising follistatin secretion thus decreasing activin A:follistatin ratio. Collectively, these findings support inhibitory roles for BMP/activin signalling in luteinization and steroidogenesis in both TC and GC.

Ted Hughes: the development of a children's poet

This article looks at how Ted Hughes' poetry for children developed over more than 30 years of publication. It traces the movement from his earlier, more conventional rhyming poems, such as Meet My Folks! (1961) and Nessie the Mannerless Monster (1964), to the mature, free verse "animal poems" for older readers of Season Songs (1976c), Under the North Star (1981) and the "farmyard fable" What is the Truth? (1984). The article argues that the later lyrical poems for younger readers where Hughes returned to rhyme, The Cat and the Cuckoo (1987) and The Mermaid's Purse (1993), represent an undervalued final phase of Hughes' work for children which is rarely discussed by critics. The discussion considers Hughes' changing attitude to the concept of the "children's poet" at different periods of his career. Reference is made throughout to Hughes' own writing about children and poetry, such as Poetry in the Making (1967), and to parallel developments in his poetry for adults.