Search results for "RIZ"
showing 10 items of 9613 documents
L'illuminazione artificiale per la valorizzazione dei contesti antichi nell'area mediterranea
2013
Occuparsi di illuminazione dovrebbe essere una responsabilità di quanti si interessano del miglioramento dell’esperienza della visita a un sito archeologico. Recentemente abbiamo assistito a una evoluzione, a una grande apertura e proiezione verso il mondo esterno di quelli che possiamo definire luoghi della memoria, come i siti archeologici. Il cambiamento coinvolge chi è preposto alla conservazione e i visitatori ed è determinato anche dall’aumento di questi ultimi. Evidentemente, c'è un maggiore interesse per la diffusione delle conoscenze riguardanti il patrimonio culturale e alla trasmissione di questi valori a un pubblico non specialistico. Occuparsi dell’illuminazione diventa un comp…
Stoïlow’s theorem revisited
2020
Stoilow's theorem from 1928 states that a continuous, open, and light map between surfaces is a discrete map with a discrete branch set. This result implies that such maps between orientable surfaces are locally modeled by power maps z -> z(k) and admit a holomorphic factorization. The purpose of this expository article is to give a proof of this classical theorem having readers in mind that are interested in continuous, open and discrete maps. (C) 2019 Elsevier GmbH. All rights reserved. Peer reviewed
Contrattualistica sportiva
2010
Il lavoro analizza la disciplina del contratto di lavoro sportivo, del contratto di sponsorizzazione, del contratto di merchandising e del contratto di vendita dei diritti televisivi
Multiethnic Japanese-English Bilinguals' Meal Time Talk
2014
This study employs sequential conversation analysis and membership categorization analysis to codeswitching multiethnic, multicultural and multilingual Japanese-English speakers. The research examines how participants accomplish social actions and goals such as teasing, planning schedules, complaining about family members, and being friends. In doing these social actions, transportable ethnic, linguistic, and cultural identities become emergent. Hence, this research shows instances of linguistic, multiethnic, and multicultural categories constructed and utilized for situational tasks and locally emergent goals. Furthermore, this study sees acts of codeswitching as a communicative resource t…
Impact flavor compounds in cooked rice cultivars from the Camargue area (France)
2010
International audience; Rice from two scented (Aychade, Fidji) and one nonscented (Ruille) cultivars from Camargue area (France) together with one Asian scented rice (Thai) were cooked and volatile compounds were extracted by dichloromethane/pentane (1;2, v/v) solvent mixture. 40 odorous compounds were noticed during GC-O analysis of the organic extracts, amongst which oct-1-en-3-one and 2-acetyl-1-pyrroline were altmost constantly perceived. Hierarchical cluster analysis (HCA) of perceived odours enabled to distinguish the groups of rice cultivars. 60 compounds were identified and quantified by GC-MS. New odour-active components of cooked rice were detected for the first time including oct…
Estimation of the frequency of copying among students using a randomized list
2013
Las recientes reformas educativas han llevado a un aumento de las tareas que los alumnos deben realizar fuera del horario lectivo. En el presente artículo estudiamos la proporción de alumnos que copian dichas tareas. Para ello, utilizamos la técnica de listas aleatorizadas, la cual mejora la fiabilidad de los datos reportados por los estudiantes porque disminuye sus incentivos a mentir. Los resultados obtenidos muestran la capacidad de dicho método para obtener información en este tipo de cuestiones de naturaleza sensible. Encontramos un alto porcentaje de alumnos que copian sus tareas (en torno al 35%), observando que los hombres copian con mayor frecuencia que las mujeres, excepto cuando …
Modeling Heterogeneous copolymerization of fluorinated monomers in scCO2
2009
In recent years the use of supercritical carbon dioxide (scCO2) in polymer processing and reaction has emerged as a “green” alternative to replace both environmentally hazardous organic solvents and water, whose utilization involves the production of large amount of waste streams. Moreover, scCO2 is non-toxic, inexpensive, and often exhibits intense plasticizing effect on polymers. In this work, the copolymerization of fluorinated monomers in scCO2 is explored. Batch free-radical copolymerization reactions of vinylidene fluoride (VDF) and hexafluoropropylene (HFP) have been carried out at temperature of 50 C and pressure of 400 bar using DEPDC as initiator and different amounts of stabilize…
Application of Silsesquioxanes in the Preparation of Polyolefin-Based Materials
2023
This paper is a review of studies on the use of the polyhedral oligomeric silsesquioxanes (POSS) of various structures in the synthesis of polyolefins and the modification of their properties, namely: (1) components of organometallic catalytic systems for the polymerization of olefins, (2) comonomers in the copolymerization with ethylene, and (3) fillers in composites based on polyolefins. In addition, studies on the use of new silicon compounds, i.e., siloxane–silsesquioxane resins, as fillers for composites based on polyolefins are presented. The authors dedicate this paper to Professor Bogdan Marciniec on the occasion of his jubilee.
Wpływ wybranych parametrów na efektywność katalizowanej wanadocenem kopolimeryzacji etylenu z norbornenem i właściwości otrzymanych produktów
2019
W pracy zbadano wpływ parametrów reakcji na kopolimeryzację etylenu z norbornenem wobec katalizatora wanadocenowego (Cp2VCl2) w obecności trichloroctanu etylu (ETA). Przeprowadzono serię reakcji kopolimeryzacji, zmieniając w każdej z nich jeden z parametrów reakcji: temperaturę lub ciśnienie etylenu. Następnie zbadano temperaturę zeszklenia, stopień wbudowania norbornenu i mikrostrukturę otrzymanych kopolimerów, poddając je analizie DSC oraz spektroskopii 13C NMR. Wykazano wpływ badanych parametrów na aktywność katalizatora oraz ilość i sposób wbudowania jednostek norbornenu w łańcuch polimerowy, jak również wartość temperatury zeszklenia produktu. Stwierdzono, że właściwości otrzymanego ko…
Copolymerization of Vinylidene Fluoride and Acrylic Acid in Supercritical Carbon Dioxide
2010
The free-radical copolymerization of vinylidene fluoride (VDF) and acrylic acid (AA) was carried out in supercritical carbon dioxide using both precipitation and dispersion techniques in the presence of an ammonium carboxylate perfluoropolyether compound. Formation of a copolymer was confirmed by variable contact time CP MAS NMR spectroscopy. Macromolecular matrices were significantly enriched in AA with respect to the initial feed composition and we found that the nonfluorinated monomer has a much higher reactivity ratio with respect to VDF. The cumulative concentration, crystallinity, and water affinity of the synthesized copolymers could be modified changing the initial feed composition,…