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showing 10 items of 3539 documents
Formal Variation and Language Change in Catalan Quantifiers : the Role of Pragmatics
2020
This article studies the formal variation of the masculine singular forms of the quantifiers u/un 'one', algú/algun 'someone, some', ningú/ningun 'no-one, anyone, not one, any, none' and cada u/cada un 'everyone, each one' in contemporary Catalan. The standard uses of these forms are contrasted with dialectal uses, obtained from a thorough search in oral and written corpora. In addition, they are compared with the uses in the other Romance languages and with their historical evolution in Catalan. The whole set of data, and especially the dialectal information on the Valencian area, allow us to explain the various factors that have interacted in the variation and formal change of these quant…
Nomi di piante e nomi di santi. San Giovanni nella lessicografia botanica siciliana
2022
A Mario Alinei si deve l’idea che alcune porzioni del lessico della nostra lingua siano più conservative di altre e che esse manifestino traccia, nelle circostanze più fortunate, delle diverse stratificazioni iconimiche prodottesi secolarmente. Il contributo rintraccia, nella lessicografia dialettale siciliana, i tipi lessicali legati alla agiofitonimia, concentrandosi in particolare sulle erbe dedicate a san Giovanni. Si propongono percorsi motivazionali anche alla luce di ipotesi etimologiche inedite.
Biofabrication of biosilica-glass by living organisms
2008
Biosilicification is an evolutionarily old and widespread type of biomineralization both in unicellular and multicellular organisms, including sponges, diatoms, radiolarians, choanoflagellates, and higher plants. In the last few years combined efforts in molecular biology, cell biology, and inorganic and analytical chemistry have allowed the first insight into the molecular mechanisms by which these organisms form an astonishing variety of siliceous structures that cannot be achieved by chemical methods. Here we report about the present stage of knowledge on structure, biochemical composition, and mechanisms of biosilica formation, focusing our attention particularly on sponges because of t…
La literatura emblemática, Goya y la avaricia
1991
GOYA, A CABALLO ENTRE DOS EPOCAS, RECURRIO A LA EMBLEMATICA COMO FUENTE DE INSPIRACION EN ALGUNAS DE SUS OBRAS, A LAS QUE IMPRIMIO SU PERSONAL INTERPRETACION. CON ESTA ORIENTACION, ENTRE SUS PRINCIPALES FUENTES SE ENCUENTRAN LOS EMBLEMAS DE ALCIATO Y EL TEATRO MORAL DE VAENIUS. (A.B.C./ L.A.G.)
Homeostasis in school science: analysis of the subject and results of a proposal for classroom work
2016
El trabajo presenta un breve repaso del nacimiento del concepto de homeostasis en la historia de la fisiología. Se ha realizado un estudio de aula con estudiantes de tercer curso de secundaria apreciando las dificultades que estos presentan para construir una visión holista del concepto de homeostasis. La ciencia escolar porta una iconicidad múltiple, derivada del lenguaje experto, que en muchos casos se revela como un obstáculo para el aprendizaje de los estudiantes novatos. Siendo la homeostasis un concepto básico en la estructura del curriculum nacional se hace una llamada para ahondar en su investigación didáctica.
Evaluation of 2,3-epoxypropyl groups and functionalization yield in glycidyl methacrylate monoliths using gas chromatography
2014
Abstract Poly(glycidyl methacrylate- co -ethylene dimethacrylate) (poly(GMA- co -EDMA)) is most frequently used as parent monolith to obtain stationary phases with a variety of surface chemistries for liquid chromatography and capillary electrochromatography. Functionalization is performed by opening the accessible 2,3-epoxypropyl groups of the monolith with a suitable reagent. The number of 2,3-epoxypropyl groups which are accessible before and after the functionalization reaction, and the grafting yield, are important parameters, required both to optimize functionalization and to interpret the chromatographic performance of functionalized monoliths. In this work, a method capable of provi…
<title>Holographic recording in amorphous semiconductor films</title>
1997
The present state of the real time holographic recording in amorphous semiconductor films is reviewed including mechanisms, parameters, properties and applications. Effects of the coherent, incoherent and relaxational self- enhancement as well as the influence of the film structure relaxation are considered. Quasi-permanent sub-band-gap light holographic recording is reported for the first time. 157
A Novel High‐Pressure Tin Oxynitride Sn 2 N 2 O
2020
Chemistry - a European journal in Press(in Press), chem.201904529 (2019). doi:10.1002/chem.201904529
Wavelength-compensated time-sequential multiplexed color joint transform correlator
2010
We report a wavelength-compensated three-channel (RGB) joint transform correlator (JTC) for color pattern recognition using a ferroelectric liquid-crystal spatial light modulator (SLM) operating in binary pure phase modulation. We apply a previously reported time-multiplexing technique useful in creating wavelength-compensated diffraction patterns, based on the synchronization of properly scaled diffraction masks with the input wavelength selection obtained by applying a rotating RGB color-filter wheel to an Ar-Kr laser. The application of this technique to a JTC architecture permits real-time color object detection. In order to achieve a high light efficiency for the correlation process, w…
Third-harmonic light polarization control in magnetically resonant silicon metasurfaces
2021
Nonlinear metasurfaces have become prominent tools for controlling and engineering light at the nanoscale. Usually, the polarization of the total generated third harmonic is studied. However, diffraction orders may present different polarizations. Here, we design an high quality factor silicon metasurface for third harmonic generation and perform back focal plane imaging of the diffraction orders, which present a rich variety of polarization states. Our results demonstrate the possibility of tailoring the polarization of the generated nonlinear diffraction orders paving the way to a higher degree of wavefront control.