Search results for "COPP"
showing 10 items of 3147 documents
TiO2-based photocatalysts impregnated with metallo-porphyrins employed for degradation of 4-nitrophenol in aqueous solutions: role of metal and macro…
2007
Photodegradation of organic compounds in water solutions by means of economically advantageous and environment-friendly processes is a topic of growing interest. In recent years a great attention has been devoted to TiO2-based photocatalysts for the oxidative degradation of various organic pollutants. In this context, we have prepared new photo-catalytic polycrystalline TiO2 systems impregnated with sensitizers, i.e., copper, iron or manganese porphyrins, and investigated their photoactivity for 4-nitrophenol oxidation compared with that of bare TiO2. A significant improvement of the photoreactivity was observed in the case of TiO2 impregnated with copper porphyrin, while only a slight bene…
Thin Film CIGS Solar Cells, Photovoltaic Modules, and the Problems of Modeling
2013
Starting from the results regarding a nonvacuum technique to fabricate CIGS thin films for solar cells by means of single-step electrodeposition, we focus on the methodological problems of modeling at cell structure and photovoltaic module levels. As a matter of fact, electrodeposition is known as a practical alternative to costly vacuum-based technologies for semiconductor processing in the photovoltaic device sector, but it can lead to quite different structural and electrical properties. For this reason, a greater effort is required to ensure that the perspectives of the electrical engineer and the material scientist are given an opportunity for a closer comparison and a common language.…
Selective encapsulation and enhancement of the emission properties of a luminescent Cu(I) complex in mesoporous silica
2018
We describe a synthetic approach to prepare new luminescent silica‐based materials through the encapsulation of a neutral copper(I) complex inside the pores of mesoporous silica nanoparticles (MSN). The copper(I) complex is present, in the solid state, as two polymorphs, blue and yellow emissive, and in solution it shows a pale yellow color that is also mirrored by an emission in the yellow‐orange region of the electromagnetic spectrum. The X‐ray structures of single crystals have been obtained for both polymorphs. The complex encapsulation in MSN is achieved by its entrapment inside micelles followed by condensation of the silica source. Interestingly, the entrapment leads to the isolation…
Sponge‐Like Behaviour in Isoreticular Cu(Gly‐His‐X) Peptide‐Based Porous Materials
2015
We report two isoreticular 3D peptide-based porous frameworks formed by coordination of the tripeptides Gly-L-His-Gly and Gly-L-His-L-Lys to Cu(II) which display sponge-like behaviour. These porous materials undergo structural collapse upon evacuation that can be reversed by exposure to water vapour, which permits recovery of the original open channel structure. This is further confirmed by sorption studies that reveal that both solids exhibit selective sorption of H2 O while CO2 adsorption does not result in recovery of the original structures. We also show how the pendant aliphatic amine chains, present in the framework from the introduction of the lysine amino acid in the peptidic backbo…
Huit objets de cuivre et de bronze du piémont pyrénéen oriental : analyse croisée typologique et métallique
2015
Cet article porte sur huit pièces à base de cuivre – deux haches plates et six poignards – provenant de la zone sous-pyrénéenne orientale (Corbières, Haute Vallée de l’Aude, Pays d’OImes), dans les départements de l’Aude et de l’Ariège de l’Est (région de Lavelanet). Elles sont décrites et replacées dans leur contexte typochronologique, alors que les aspects technoéconomiques sont envisagés via la composition métallique (composition élémentaire et rapports isotopiques du plomb). Cinq objets en cuivre – deux haches et trois poignards – sont attribués au Chalcolithique. L’une des haches se rapproche des types nord-ibériques et son importation depuis cette région est suggérée par les analyses …
I rapporti patrimoniali tra i conviventi
2014
Il saggio analizza il tema dei rapporti patrimoniali all'interno della coppia di fatto, con prevalente attenzione alla fase fisiologica dello svolgimento del rapporto affettivo. Nell'assenza di una specifica normativa, la disciplina applicabile viene di volta in volta rintracciata con riferimento alle norme costituzionali e ai principi generali dell'ordinamento, alle regole di formazione pattizia e agli enunciati consolidati nel diritto vivente, senza dimenticare l'apporto, anch'esso a volte criticamente discusso,del formante dottrinale.
Halogen Bonds in 2,5-Dihalopyridine-Copper(I) Halide Coordination Polymers
2019
Two series of 2,5-dihalopyridine-Cu(I)A (A = I, Br) complexes based on 2-X-5-iodopyridine and 2-X-5-bromopyridine (X = F, Cl, Br and I) are characterized by using single-crystal X-ray diffraction analysis to examine the nature of C2&minus
Aplidin® induces JNK-dependent apoptosis in human breast cancer cells via alteration of glutathione homeostasis, Rac1 GTPase activation, and MKP-1 ph…
2006
Aplidin® is an antitumor agent in phase II clinical trials that induces apoptosis through the sustained activation of Jun N-terminal kinase (JNK). We report that Aplidin® alters glutathione homeostasis increasing the ratio of oxidized to reduced forms (GSSG/GSH). Aplidin® generates reactive oxygen species and disrupts the mitochondrial membrane potential. Exogenous GSH inhibits these effects and also JNK activation and cell death. We found two mechanisms by which Aplidin® activates JNK: rapid activation of Rac1 small GTPase and downregulation of MKP-1 phosphatase. Rac1 activation was diminished by GSH and enhanced by L-buthionine (SR)-sulfoximine, which inhibits GSH synthesis. Downregulatio…
Procreazione medicalmente assistita: il consenso alle tecniche di pma e la responsabilità genitoriale di single, conviventi e parti unite civilmente
2018
Il saggio prende in esame il tema dell’aspirazione alla genitorialità delle persone singole e delle coppie same-sex dopo la legge n. 76/2016 sulle unioni civili e le convivenze, e quello del formale riconoscimen- to della genitorialità acquisita in fatto dagli stessi soggetti e della connessa responsabilità genitoriale. Ricostruita la cornice costituzionale di riferimento, vengono proposte alcune soluzioni interpretative volte a superare in via ermeneutica l’inconciliabilità di talune regole di rango ordinario con le regole e i principî apicali rintracciati in un sistema multilivello delle fonti. Esaminate le disposizioni del codice civile e delle leggi speciali in materia di assunzione del…
Previsione delle prestazioni del veicolo su strada: stato dell’arte
2016
Questo lavoro contiene una rassegna dei metodi che sono usati per la previsione delle prestazioni del veicolo su strada, in dipendenza del motore installato. La prima parte mostra il calcolo delle resistenze al moto, cioè le forze che il veicolo deve vincere per avanzare sulle strade piane e in salita. Particolarmente interessante appare la parte che riguarda la resistenza aerodinamica, della quale si tratta di metodi sperimentali (galleria del vento), metodi empirici e metodi CFD. Si propone inoltre l’applicazione della norma CUNA sulla velocità per la determinazione dei consumi anche al calcolo dei coefficienti aerodinamici. La rassegna esclude la resistenza accidentale in curva perché no…