High nonlinear optical response in 4-chlorothiazole-based azo dyes

Four azo dyes showing high nonlinear optical properties were prepared, based on a 4-chlorothiazole azo moiety functionalized with strong acceptor groups and/or further donor/acceptor groups along the conjugated backbone. The effects of the acceptors as well as the lateral donor/acceptor groups upon absorption properties, thermal stability and second order nonlinear optical activity were evaluated. © 2010 Elsevier Ltd. All rights reserved

Perylene diimides functionalized with N-thiadiazole substituents: Synthesis and electronic properties in OFET devices

Two new perylene diimide derivatives N,N′-bis(5-tridecyl-1,3,4- thiadiazol-2-yl)perylene-3,4,9,10-tetracarboxylic 3,4:9,10-diimide (PDI-T1) and N,N′-bis[5-(1-hexyl)nonyl-1,3,4-thiadiazol-2-yl]perylene-3,4,9, 10-tetracarboxylic 3,4:9,10-diimide (PDI-T2), achieved by functionalizing the basic perylene molecular core at imide nitrogen with 1,3,4-thiadiazole rings, have been synthesized. Both these compounds make possible the fabrication of n-type organic thin-film transistors able to work in air, even when bare SiO2 surfaces are utilized as gate dielectric. As active channels of transistors in the bottom-contact bottom-gate configuration, PDI-T1 evaporated films exhibited a maximum mobility of 0.016 cm2/V s in vacuum. For evaporated PDI-T2 films, instead, mobility values were found to be more than one order of magnitude lower, because of their reduced degree of crystalline order. However, PDI-T2 films can be also deposited by solution techniques and field-effect transistors were fabricated by spin-coating, displaying mobility values ranging between 10-6 and 10-5 cm2/V s. Similar to what previously found for other perylene diimide derivatives, our experimental work also demonstrates that the electrical response of both PDI-T1 and PDI-T2 transistors under ambient conditions can be improved by increasing the level of hydrophobicity of the dielectric surface. © 2012 Elsevier B.V. All rights reserved

Fundamentals of Laparoscopic Surgery: A Surgical Skills Assessment Tool in Gynecology

This analysis suggests that the fundamentals of laparoscopic surgery skills test may be a valuable assessment tool for gynecology residents; however, the cognitive test may need further adaptation for application to gynecologists

Geopolymer composites for potential applications in cultural heritage

A new class of geopolymer composites, as materials alternative to traditional binders, was synthesized and its potentialities as restoration material in Cultural Heritage has been explored. This material has been prepared through a co-reticulation reaction in mild conditions of a metakaolin-based geopolymer inorganic matrix and a commercial epoxy resin. The freshly prepared slurry displays a consistency, workability and thixotropic behavior that make it suitable to be spread on different substrates in restoration, repair and reinforcement actions, even on walls and ceilings. Applicability and compatibility tests on tuff and concrete substrates were carried out and the microstructure of the samples in correspondence of the transition zone was analyzed by means of scanning electron microscope (SEM) observations and energy dispersive spectroscopy (EDS) mapping. Our studies pointed out the formation of a continuous phase between the geopolymer composite and tuff and concrete substrates, highlighting a high compatibility of the geopolymer binder with different kinds of materials. These features indicate a large potential for applications of these materials in Cultural Heritage

A real-time compact monitor for environmental radiation: Cosmic rays and radioactivity

We report here about the possibility of using a compact scintillation NaI(Tl) detector, long-term stable and reliable, to monitor separately the components of the environmental radiation, i.e. in the energy range 0.28–2.8 MeV, due to very low energy secondary (Ultrasoft) cosmic radiation and radioactivity, airborne and from environment matter. We suggest some procedures to accomplish time variation analysis, by using a sample of data collected in Bologna

DiagText: manual do usuário.

DiagText é uma ferramenta que teve como objetivo inicial auxiliar o processo de extração de informações de documentos textuais que descrevem doenças de culturas agrícolas para formação de uma árvore de decisão baseada nos sintomas das doenças avaliadas.bitstream/item/11847/1/doc84.pd