Search results for " IR"
showing 10 items of 1350 documents
The Comparison of Self-Perception of the Use of Learning Strategies in Spanish and Lithuanian Secondary Students When Learning Science
2021
Improving students‘ learning strategies is important for them in order to learn successfully. This article compares the self-perception of the use of learning strategies in Spanish and Lithuanian secondary schools students when learning science and analyse the students understanding of these strategies to determine the sociocultural environment influence on this perception. Results emphasize the need to include support actions to improve the management of strategies in secondary school.
Application of Molecular Topology for the Prediction of Reaction Yields and Anti-Inflammatory Activity of Heterocyclic Amidine Derivatives
2011
Topological-mathematical models based on multiple linear regression analyses have been built to predict the reaction yields and the anti-inflammatory activity of a set of heterocylic amidine derivatives, synthesized under environmental friendly conditions, using microwave irradiation. Two models with three variables each were selected. The models were validated by cross-validation and randomization tests. The final outcome demonstrates a good agreement between the predicted and experimental results, confirming the robustness of the method. These models also enabled the screening of virtual libraries for new amidine derivatives predicted to show higher values of reaction yields and anti-infl…
Calibration of the underground muon detector of the Pierre Auger Observatory
2021
To obtain direct measurements of the muon content of extensive air showers with energy above $10^{16.5}$ eV, the Pierre Auger Observatory is currently being equipped with an underground muon detector (UMD), consisting of 219 10 $\mathrm{m^2}$-modules, each segmented into 64 scintillators coupled to silicon photomultipliers (SiPMs). Direct access to the shower muon content allows for the study of both of the composition of primary cosmic rays and of high-energy hadronic interactions in the forward direction. As the muon density can vary between tens of muons per m$^2$ close to the intersection of the shower axis with the ground to much less than one per m$^2$ when far away, the necessary bro…
Estudio comparado entre el impacto de la política migratoria estadounidense sobre la Frontera Norte de México y la política migratoria española sobre…
2020
A través de este trabajo, se pretende mostrar los resultados de la investigación sobre el terreno llevada a cabo en la ciudad fronteriza de Tijuana y algunos puntos clave de la frontera norte de México con Estados Unidos ubicados en la región de Baja California y California, para compararlos con los obtenidos en el estudio realizado en las ciudades autónomas de Ceuta y Melilla, además de otras localidades cercanas a la frontera sur de España con Marruecos. Su finalidad es establecer hasta qué punto el control de fronteras ha condicionado el patrón de desplazamientos de migrantes irregulares hacia estos países, y cuáles han sido sus consecuencias en las regiones fronterizas. Así, en primer l…
Naisvankien näkemyksiä valvotusta koevapaudesta
2018
Tutkimuksen tehtävänä on selvittää naisvankien näkemyksiä valvotusta koevapaudesta sekä millaisia näkemyksiä naisvangit nostavat esiin valvotun koevapauden prosessista. Tarkoi-tuksena on tarkastella naisvankien valvottua koevapautta naiserityisyyden, marginaalisuu-den ja rikollisuudesta irrottautumisen eli desistanssin käsitteen kautta. Valvottu koevapaus on tullut Suomen rangaistusjärjestelmään 1.1.2006 ja valvotun koeva-pauden lakia uudistettiin 1.1.2014. Valvottu koevapaus on vielä suhteellisen tuore rangaistusmuoto. Valvotun koevapauden tarkoituksena on saada vanki palautumaan asteittain takaisin yhteiskuntaan. Vanki voi päästä suorittamaan koevapautta valvonnan alaisena vapau-teen tiet…
Understanding generation of multifunctional nanogels in chemical-free e-beam irradation synthesis
2018
Radiation engineered nanogels are the core of very promising theranostic nanodevoces. They can be produced starting from aqueous solutions of chemically inert polymers by pulsed e-beam irradiation.
Microwave-assisted synthesis of semiconductor nanoparticles in water/oil microemulsion
2005
Stable CdS and ZnS nanoparticles with exalted luminescence properties have been obtained in water/sodium bis (2-ethylhexyl) sulfosuccinate (AOT)/n-heptane microemulsion using microwave in order to take away selectively water molecules from microemulsion system. The nanoparticles synthesis was performed using a microwave exposure set-up opportunely assembled that allows irradiating the reactor with microwave of 2.45 GHz maintaining constant the temperature. The nanoparticles growth kinetics, as a function of irradiation time, was performed by means of UV-Vis spectroscopy. Information about the structural changes that microemulsion undergoes when irradiated with microwave was obtained by mean…
Un ironico gioco di contrappunti. Il Decameroncino di Luigi Capuana
2019
The Decameroncino is an emblematic text, in the literary workshop of Capuana, of a constant research theoretical on the form of modern novella. The relationship exhibited with Boccaccio's work allows the writer of Mineo to institute a wise game of filming and overturning, woven with the double thread of counterpoint ironic. The organic system of the Decameron is remodeled in the sense of fragmentation. Through a fantastic restless and paradoxical, the narrative suspends criteria of deterministic realism to allude to complexity of the true and of the writing that figures it.
Impacto del tratamiento periodontal en el ratio rnakl/opg
2015
La reabsorción ósea es uno de los procesos con mayor transcendencia en la periodontitis. El descubrimiento del eje RANKL/RANL/0PG (receptor activador de la osteoclastogénesis) supuso un avance en la comprensión del remodelado óseos fisiológico y patológico. Los recientes estudios realizados tanto a nivel histológico como a nivel del fluido crevicular, han comprobado el aumento del ratio RANKL/OPG en los pacientes con periodontitis.Nuevos conocimientos en ésta línea aportarán información sobre la patogenia y por tanto podrían ser utilizados en el diagnóstico y tratamiento periodontal. Objetivo: Determinar el efecto del tratamiento periodontal básico (raspado y alisado radicular, junto con in…
Origins of radiation-induced attenuation in pure-silica-core and Ge-doped optical fibers under pulsed x-ray irradiation
2020
We investigated the nature, optical properties, and decay kinetics of point defects causing large transient attenuation increase observed in silica-based optical fibers exposed to short duration and high-dose rate x-ray pulses. The transient radiation-induced attenuation (RIA) spectra of pure-silica-core (PSC), Ge-doped, F-doped, and Ge + F-doped optical fibers (OFs) were acquired after the ionizing pulse in the spectral range of [∼0.8–∼3.2] eV (∼1500–∼380 nm), from a few ms to several minutes after the pulse, at both room temperature (RT) and liquid nitrogen temperature (LNT). Comparing the fiber behavior at both temperatures better highlights the thermally unstable point defects contribut…