3,961 research outputs found
Sobre algunas técnicas pesqueras tradicionales vascas.
Hemos limitado nuestra atención al estudio de las pesquerÃas 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 habÃa 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 caracterÃsticas de las maniobras que realizan nuestros pescadores, asà 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
Didà ctica 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 quÃmics
Tot i que no hi ha cap normativa especÃfica, cal que en els centres educatius fem un esforç per garantir la seguretat en l'emmagatzematge de productes quÃmics
Didà ctica 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
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
El laboratori del teu centre és un lloc segur?
La seguretat del laboratori escolar es pot avaluar mitjançant un qüestionari
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 AndalucÃa 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 AndalucÃa Tec
- …