Sobre algunas técnicas pesqueras tradicionales vascas.

Hemos limitado nuestra atención al estudio de las pesquerías tradicionales modestas, realizadas con aparejos de anzuelo en las costas vascas y cantábricas. Las primeras noticias que de ellas nos llegan remontan al siglo XII y XIV, haciendo referencia a las pescas de besugos y cazones, siendo la más antigua una procedente de 1272 que menciona las pesqueras de congrios de Bayona. Recogemos información de los aparejos habitualmente usados para estas pescas, insistiendo en que, en un principio, se utilizaron sólamente aparejos de mano, y que la aparición de los primeros palangres de gran fondo es mucho más reciente de lo que se había pensado. Económicamente, tras la pesca del besugo y la merluza, se explotó la pesca de los entonces denominados «peces de cuero» (pequeños escualos) y, con una intensidad muy superior a la actual, graciasa su fácil conservación, la de los congrios. Se exponen los aparejos utilizados para la captura de estas especies y algunas características de las maniobras que realizan nuestros pescadores, así como algunos modos de comercialización y conservación del pescado. He intentado, a la vez, recoger cuantas voces vascas se refieren al tema, muchas de ellas fonéticamente, ya hace medio siglo, y sus variantes locales. Asimismo las correspondientes voces castellanas

Didàctica de la seguretat : les normes

Per a la seguretat en el laboratori escolar és fonamental que l'alumnat tingui un bon coneixement de les normes de seguretat i les segueixi estrictament. Per aconseguir-ho cal organitzar adequadament l'ensenyament d'aquests contingut

Emmagatzematge de productes químics

Tot i que no hi ha cap normativa específica, cal que en els centres educatius fem un esforç per garantir la seguretat en l'emmagatzematge de productes químics

Didàctica de la seguretat

La seguretat en el laboratori passa perquè els alumnes coneguin les normes de seguretat i la forma correcta d'utilització dels instruments i gestió dels residus

El laboratori del teu centre és un lloc segur?

La seguretat del laboratori escolar es pot avaluar mitjançant un qüestionari

The stratified p-center problem

This work presents an extension of the p-center problem. In this new model, called Stratified p-Center Problem (SpCP), the demand is concentrated in a set of sites and the population of these sites is divided into different strata depending on the kind of service that they require. The aim is to locate p centers to cover the different types of services demanded minimizing the weighted average of the largest distances associated with each of the different strata. In addition, it is considered that more than one stratum can be present at each site. Different formulations, valid inequalities and preprocessings are developed and compared for this problem. An application of this model is presented in order to implement a heuristic approach based on the Sample Average Approximation method (SAA) for solving the probabilistic p-center problem in an efficient way.Comment: 32 pages, 1 pictur

Heat transfer enhancement using nanofluids in the compression exchanger in a solar Stirling engine

In this paper a improvement in the heat exchange of a solar Stirling engine during the compression phase was studied. The viability of using nanoparticles as ceramic oxide (Al2O3 in water) at different concentrations instead of conventional refrigerants (water or air) was evaluated. Since these systems could behave as non- Newtonian fluids the dynamic viscosity was measured, as well as other thermophysical properties. The results showed that the convective heat transfer coefficient could raise one order of magnitude respect to the conventional heat transfer fluids at moderately volume fractions (over 0.15).Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec

The Plasticity of Discourse Analysis for Social Science Research

This chapter argues that discourse analysis in its most varied approaches and methods is a reliable tool to research in a wide range of topics within the social sciences due to its flexibility, efficiency and productiveness in its outcomes. This is why I draw on the centrality of discourse in the constitutive relations between language in action and the construction and negotiation of identities. I illustrate this claim by presenting outcomes of two decades of research activity on racism and discrimination against Mapuche people in Chileans’ everyday discourse and their psychosocial effects on Mapuche individuals approached through critical discourse analysis, the discursive construction of ethnic identity in Mapuche adolescents in Chile dealt through discursive psychology and conversational analysis and finally Mapuche ethnic identity and culturally recreated places in Santiago studied through socio-interactional narrative approach

Characterization and thermophysical properties of rutile and alumina nanofluids

The characterization in relation to shape and particle size of alumina and rutile suspensions was performed. The intrinsic viscosity exhibited the presence of nonspherical aggregates in both suspensions although TEM images showed non monodisperse spherical shape of alumina particles. DLS indicated the existence of particle aggregates for both systems. In all cases, the increase in thermal conductivity with respect to the base fluid is verified. The thermal conductivities obtained experimentally were compared with three mathematical models, which yielded lower values than those measured. From rheological measurements and by means of the Peclet number defined in colloidal suspensions, values of thermal conductivity were also proposed.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec