Search results for "gall"
showing 10 items of 903 documents
Ciencia en las aulas: Prácticas pedagógicas, cultura material e historia de la ciencia en la obra de Modesto Bargalló en España (1894-1939)
2020
La presente tesis doctoral aborda la biografía de Modesto Bargalló (1894-1981), centrada en sus orígenes, sus años de formación y de docencia en España (1894-1939). El relato biográfico confeccionado, atendiendo a las perspectivas más recientes sobre la aproximación biográfica, le revela como testigo y actor destacado de la renovación pedagógica experimentada por enseñanza de las ciencias en el primer tercio del siglo XX. Dicho relato ha sido elaborado a partir del estudio de su ingente producción impresa (como sus manuales de ciencias y obras para maestros), incluyendo algunas obras hasta ahora inéditas como el boletín Faraday, fundado por Bargalló en 1928 y considerada la primera publicac…
Local structure of gallate proton conductors
2009
Lanthanum barium gallate proton conductors are based on disconnected GaO4 groups. The insertion of hydroxyls in the LaBaGaO4 network proceeds through self-doping with Ba2+, consequent O2- vacancy formation to fulfill charge neutrality. With a structural investigation on self-doped LaBaGaO4 oxides using synchrotron XRD and EXAFS on the Ga K-edge, we find that: (a) the GaO4 tetrahedra retain their size throughout the whole series; (b) the GaO4 tetrahedra rotate as rigid bodies on hydration, leading to the formation of a network of shorter O-O configurations that are stabilized by hydrogen bonds; (c) contraction of the lattice occurs along the a unit cell axis, as a consequence of an overall s…
El final del bandoler : aproximació a la literatura de patíbul de la Corona d?Aragó
2017
Resum: Durant l’època moderna s’imprimiren nombrosos plecs de cordell relacionats amb el bandolerisme en els territoris de la Corona d’Aragó. Una part important d’aquests textos populars és el final que rep el protagonista de la història, què normalment solia acabar en el patíbul. Per eixa raó, el present article posa l’accent en un tema poc tractat fins al moment com són les execucions públiques en aquest tipus de relats literaris. En aquestes pàgines s’estudia, per una banda, el ritual punitiu que sofria el reu quan anava a ser executat: formes d’execució, turments, penes corporals o la intenció que tenien els pamflets que s’imprimien. Per altra, es comparen documents judicials amb els pl…
Laser spectroscopy of gallium isotopes beyond N = 50
2012
The installation of an ion-beam cooler-buncher at the ISOLDE, CERN facility has provided increased sensitivity for collinear laser spectroscopy experiments. A migration of single-particle states in gallium and in copper isotopes has been investigated through extensive measurements of ground state and isomeric state hyperfine structures. Lying beyond the N = 50 shell closure, 82Ga is the most exotic nucleus in the region to have been studied by optical methods, and is reported here for the first time. ispartof: pages:012071-6 ispartof: Journal of Physics: Conference Series vol:381 issue:1 pages:012071-6 ispartof: Rutherford Centennial Conference on Nuclear Physics location:Manchester, UK dat…
Identification of highly effective antitrypanosomal compounds in essential oils from the Apiaceae family
2018
The Apiaceae family encompasses aromatic plants of economic importance employed in foodstuffs, beverages, perfumery, pharmaceuticals and cosmetics. Apiaceae are rich sources of essential oils because of the wealth of secretory structures (ducts and vittae) they are endowed with. The Apiaceae essential oils are available on an industrial level because of the wide cultivation and disposability of the bulky material from which they are extracted as well as their relatively cheap price. In the fight against protozoal infections, essential oils may represent new therapeutic options. In the present work, we focused on a panel of nine Apiaceae species (Siler montamon, Sison amomum, Echinophora spi…
Temperature dependence of the E2h phonon mode of wurtzite GaN/AlN quantum dots
2008
Raman scattering has been used to study the temperature dependence of the frequency and linewidth of the E2h phonon mode of GaN/AlN quantum dot stacks grown on 6H-SiC. The evolution of the nonpolar phonon mode was analyzed in the temperature range from 80 to 655 K for both quantum dots and barrier materials. The experimental results are interpreted by comparison with a model that takes into account symmetric phonon decay and the different thermal expansions of the constituents of the heterostructure. We find a small increase in the anharmonic parameters of the phonon modes in the heterostructure with respect to bulk. jorbumar@alumni.uv.es Alberto.Garcia@uv.es Ana.Cros@uv.es
Oscillator strength reduction induced by external electric fields in self-assembled quantum dots and rings
2007
We have carried out continuous wave and time resolved photoluminescence experiments in self-assembled In(Ga)As quantum dots and quantum rings embedded in field effect structure devices. In both kinds of nanostructures, we find a noticeable increase of the exciton radiative lifetime with the external voltage bias that must be attributed to the field-induced polarizability of the confined electron hole pair. The interplay between the exciton radiative recombination and the electronic carrier tunneling in the presence of a stationary electric field is therefore investigated and compared with a numerical calculation based on the effective mass approximation.
Correlation between optical properties and barrier composition in InxGa1−xP/GaAs quantum wells
1998
9 páginas, 11 figuras.
Nuorten identiteetti-ilmaisu IRC-Galleriassa : ilmaisukeinoina nimimerkit, profiilikuvat ja kuvatekstit
2010
NUORTEN IDENTITEETTI-ILMAISU IRC-GALLERIASSA Ilmaisukeinoina nimimerkit, profiilikuvat ja kuvatekstit Piia Pyykkönen Sosiologia Pro gradu-tutkielma Yhteiskuntatieteiden ja filosofian laitos Jyväskylän yliopisto Ohjaaja: Terhi-Anna Wilska Syksy 2010 Sivumäärä: 113 Pro gradu-tutkielmani käsittelee nuorten identiteetti-ilmaisua IRC-Galleriassa. Identiteettiilmaisun selvittämisessä ovat apuna nuorten profiilikuvat, niihin liittyvät tekstit sekä nuorten itselleen keksimät nimimerkit. Aineisto on kerätty internetin sosiaalisesta yhteisöpalvelusta IRC-Galleriasta. Aineisto koostuu neljässä eri yhteisössä olevien jäsenten profiilikuvista, niihin liittyvistä kuvateksteistä ja jäsenten nimimerkeistä.…
Liberalizing Industrial Relations in Southern-Europe: Towards the End of a Coordinated and Egalitarian Model
2016
The paper focuses on the changes that occurred to the architecture of industrial relations in Southern-European countries during the last decade. In particular, the bargaining systems of Italy, France, Spain, Greece and Portugal are compared, with a particular attention to the legislative measures enacted under the influence of international institutions after the 2008 financial and sovereign debt crisis. The theoretical framework, under which the process of transformation is analysed, is the literature on comparative politics as recently reviewed by Thelen. At the same time, the work takes into account the labour law dogmatic category of "inderogability", represented by the couple law-bran…