Search results for " SEM"
showing 10 items of 1467 documents
Strategie e traduzioni in cucina: la caponata
2020
Il capitolo rappresenta la prosecuzione di un lavoro di ricostruzione storico, semiotico e simbolico della significazione del famoso piatto della cucina siciliana già iniziato con il saggio "Caponata Rovina di Sicilia. In questo ulteriore saggio si offre una rivisitazione il più possibile esauriente delle medesime problematiche, aggiungendo un'analisi dei discorsi mediatici a proposito di caponata. The chapter represents the continuation of a work of historical, semiotic and symbolic reconstruction of the significance of the famous dish of Sicilian cuisine already begun with the essay "Caponata Rovina di Sicilia. In this further essay we offer a review as comprehensive as possible of the sa…
Caponata, rovina di Sicilia
2019
L’articolo ricostruisce la significazione della caponata, storico piatto della cucina siciliana, a partire dalla sua dimensione simbolica di piatto locale e comunitario, passando, quindi ad analizzarne la defi- nizione dizionariale. Della caponata, si ricostruisce l’etimologia e la genealogia. A partire dall’interpretazione delle trasformazioni storiche del piatto, l’articolo avanza l’ipotesi che alla base del suo senso profondo possa essere rintracciata l’estetica romantica della rovina.
Genitori e bambini: lasciamoli guardare in pace i loro cartoni
2017
Che differenza c'è fra l'analisi semiotica dei cartoni animati e la sua "versione facile"? In rete e nell'editoria si diffondono sempre più spesso testi a commento dei cartoni animati che piuttosto che aprire alla complessità del mondo tendono a costituire una volontà di controllo e di imposizione di visioni ideologiche pregresse.
On Language Adequacy
2015
Abstract The paper concentrates on the problem of adequate reflection of fragments of reality via expressions of language and inter-subjective knowledge about these fragments, called here, in brief, language adequacy. This problem is formulated in several aspects, the most general one being: the compatibility of the language syntax with its bi-level semantics: intensional and extensional. In this paper, various aspects of language adequacy find their logical explication on the ground of the formal-logical theory of syntax T of any categorial language L generated by the so-called classical categorial grammar, and also on the ground of its extension to the bi-level, intensional and ex- tensio…
Estudios sobre la enseñanza y aprendizaje de la resolución aritmética de problemas usando un sistema tutorial inteligente
2021
La resolución de problemas siempre ha ocupado un lugar importante en los currículos de matemáticas tanto en educación primaria como en educación secundaria. Un tipo de problemas, particularmente frecuente, son aquellos en los que la información viene dada mediante una narración en la que se describen situaciones cotidianas en las que participan cantidades. Estos problemas verbales son unos de los primeros a los que se enfrentan los estudiantes en su etapa escolar y que los acompañan hasta la finalización de la etapa secundaria. De manera general, los resultados mostrados en el estudio PISA (OECD, 2014a) ponen de manifiesto que la resolución de problemas matemáticos escolares y los problemas…
New phenolics, cytotoxicity and chemosystematic significance of Atriplex semibaccata
2019
Abstract The chemical characterization of the 70% hydromethanolic extract of Atriplex semibaccata (family: Chenopodiaceae) afforded a new methoxylated flavonol triglycoside, atrisemibaccatoside A (1), and a new lignanamide, (N-[(E)-m-hydroxycinnamoyl]tyramine (7), as well as, five known flavonols (2–6) and two lignanamides (8–9). The structures of the isolated compounds were established depending upon LR&HR-FAB-MS, 1D and 2D NMR spectroscopic analyses. The cytotoxic activity of the isolated compounds (1–4, and 7–9) was investigated. Compounds 7, 8 and 9 weakly inhibited the proliferation of leukemia CCRF-CEM cells with IC50 values of 78.5, 46.3, and 71.2 μg/ml, respectively, and exhibited n…
Molecular Tuning of the Magnetic Response in Organic Semiconductors
2017
The tunability of high-mobility organic semi-conductors (OSCs) holds great promise for molecular spintronics. In this study, we show this extreme variability - and therefore potential tunability - of the molecular gyromagnetic coupling ("g-") tensor with respect to the geometric and electronic structure in a much studied class of OSCs. Composed of a structural theme of phenyl- and chalcogenophene (group XVI element containing, five-membered) rings and alkyl functional groups, this class forms the basis of several intensely studied high-mobility polymers and molecular OSCs. We show how in this class the g-tensor shifts, $\Delta g$, are determined by the effective molecular spin-orbit couplin…
In-tube solid-phase microextraction coupled by in valve mode to capillary LC-DAD: Improving detectability to multiresidue organic pollutants analysis…
2009
Abstract A simple and fast capillary chromatographic method has been developed to identify and quantify organic pollutants at sub-ppb levels in real water samples. The major groups of pesticides (organic halogens, organic phosphorous, and organic nitrogen compounds), some hydrocarbons (polycyclic aromatic hydrocarbons), phthalates and some phenols such as phenol and bisphenol A (endocrine disruptors) were included in this study. The procedure was based on coupling, in-tube solid-phase microextraction (IT-SPME) by using a conventional GC capillary column (95% methyl–5% phenyl substituted backbone, 80 cm × 0.32 mm i.d., 3 μm film thickness) in the injection valve to capillary liquid chromatog…
Characterization of a fiber-reinforced new fully aromatic liquid crystalline polymer
1998
A new rigid liquid crystalline polymer that demonstrates good mechanical and thermomechanical properties and acceptable processing temperature has been recently synthesized and characterized. The melting temperature and some thermomechanical properties do not seem, however, suitable for use in some applications at high temperature or in the presence of aggressive fluids. The use of appropriate inorganic fillers can overcome these shortcomings. In this work the new LCP, polymerized in a bench-scale apparatus, and the same sample filled with carbon fibers are characterized. The properties of the carbon fiber filled LCP are compared with those of another filled wholly aromatic commercial LCP,…
Design, synthesis and photovoltaic properties of [60]fullerene based molecular materials
2005
Abstract The possibility to use new organic semiconductor materials, in place of silicon wafers, in the fabrication of photovoltaic devices on substrates offer the prospect of lower manufacturing costs, particularly for large area applications. Thus, one of the most promising areas in fullerene research involves its potential application, mixed with conjugated polymers, in mimicking photosynthesis and in the related solar energy conversion. The tendency to phase segregation in blends of C60 derivatives and conjugated polymers has to be optimized to improve both charge photogeneration and transport in photovoltaic devices. In order to optimize device performances, a great deal of work has be…