4,218 research outputs found
Advances in Functional Solution Processed Planar 1D Photonic Crystals
No full textAn overview on the properties and applications of polymer and inorganic planar 1D photonic crystals fabricated from solution is provided here. In the last decades, photonic crystals became technologically relevant for light management, photovoltaics, sensing, and lasing. Such structures are traditionally produced by lithographic and vacuum techniques, but the need to reduce costs and to scale-up the fabrication have lead the research toward new materials, simplified structures, and low-cost mass scale growth processes. In this regard, polymer and inorganic mesoporous distributed Bragg reflectors fabricated from solution attracted considerable technological interest. This review focuses on the properties of such structures, concentrating on state-of-the-art fabrication and applications
Le «buone letture». 2. Giovanni Casati
No full textIl saggio è costituito da due parti, la prima delle quali, dedicata alla fondazione della Federazione italiana delle biblioteche circolanti cattoliche, è stata pubblicata nel precedente numero dei «Nuovi Annali», XXVII (2013), pp. 137-163. In questa seconda parte viene delineata la figura intellettuale di Giovanni Casati, che diresse la «Rivista di letture» dal 1912 al 1944, trasformando il periodico della Federazione in una rivista impegnata nella divulgazione della cultura cattolica. A questo impegno militante Casati fece corrispondere un intenso programma editoriale, che trovò espressione nella pubblicazione di saggi letterari, di manuali e opere repertoriali.The study consists of two parts; the first is dedicated to the history of the Federazione italiana delle biblioteche circolanti cattoliche since its foundation (1904) up to 1912 and was published in the previous volume of the «Nuovi Annali », XXVII (2013), pp. 137-163. In this second part, the author outlines the intellectual figure of Giovanni Casati, who directed the «Rivista di letture» from 1912 to 1944, transforming the magazine of the Federation in a journal engaged in the spreading of Catholic culture. To this militant engagement Casati matched an intense publishing program, which found its expression in the publication of literary essays, manuals and reference works
Comico e tragico del diritto nella novellistica italiana: il novelliere di Giovanni Sercambi
No full textNelle novelle di età tardomedievale ed umanistica, a causa del loro carattere fortemente realistico, il diritto ha un posto importante, poiché rappresenta un elemento centrale e ineliminabile della vita della comunità. Il novelliere di Giovanni Sercambi da Lucca non fa eccezione, anche se l’autore non ha una cultura giuridica né s’interessa in modo specifico al diritto. Il presente saggio vuole analizzare sotto tale profilo queste novelle per verificare quale concezione del diritto emerge da esse e come la narrazione ne risulti arricchita.In the late medieval and humanistic novellas, owing to their very realistic character, the right is an important central and inevitable element in community life. Giovanni Sercambi’s novelliere is no exception even if the author lacks a legal culture, nor is specifically interested in right. This essay intends to analyze these novellas under this profile to verify what kind of right they consider and how the stories are enriched
Sintesi di materiale ibrido a base di PVAL e ossido di titanio idrato per applicazioni fotoniche
No full textCellulose ternary photonic crystal created by solution processing
No full textFor the first time, a multiplanar photonic crystal structure has been obtained using cellulose as a structural material. This all-polymer system, made of cellulose, polyvinyl alcohol and poly(N-vinylcarbazole) is a ternary planar photonic crystal composed by 7 repeated trilayers produced by spin coating. Trimethylsilyl cellulose is used as a precursor to be converted to cellulose. Transverse Transmission Electron Microscopy analysis of our systems confirms the multilayered structure whose optical response can be theoretically accounted for. Preliminary results on the response of the photonic crystal to water vapors envisage the use of this system for humidity optical sensing
Bird presence vegetation complexity data in Melbourne, Australia. Data created in 2018 by Giovanni Carrabs.
No full textBird presence and vegetation complexity data from Melbourne, Australia. Data created for a university thesis project and publication in 2018. Author: Giovanni Carrabs.</p
Chapter Atto biografo di Giovanni Gualberto
No full textThe paper examines the Vita s. Iohannis Gualberti by Atto, reconstructing its genesis and fortune. Probably the author wrote this hagiography when he was abbot and before becoming bishop of Pistoia. He re-elaborated the Life of the saint by Andrea of Strumi, adapting it to a changed historical and ecclesiastical context. The text was successful among the Vallombrosan Order and it was used by later hagiographers to create epitomes and rewritings of the Life of Giovanni Gualberto
All-Polymer Photonic Microcavities Doped with Perylene Bisimide J-Aggregates
No full textThanks to exciting chemical and optical features, perylene bisimide J-aggregates are ideal candidates to be employed for high-performance plastic photonic devices. However, they generally tend to form pi-pi stacked H-aggregates that are unsuitable for implementation in polymer resonant cavities. In this work, the efficient compatibilization of a tailored perylene bisimide forming robust J-aggregated supramolecular polymers into amorphous polypropylene is introduced. The new nanocomposite is then implemented into an all-polymer planar microcavity, which provides strong and directional spectral redistribution of the J-aggregate photoluminescence, due to a strong modification of the photonic states. A systematic analysis of the photoemitting processes, including photoluminescence decay and quantum yields, shows that the optical confinement in the polymeric microcavity does not introduce any additional nonradiative de-excitation pathways to those already found in the J-aggregate nanocomposite film and pave the way to PBI-based high-performance plastic photonic devices
High refractive index hyperbranched polyvinylsulfides for planar one‐dimensional all‐polymer photonic crystals
No full textWe report on the growth and characterization of onedimensional
(1D) planar all-polymer photonic crystals (PhC) with
high dielectric contrast (Dn50.3) prepared by spin coating using
hyperbranched polyvinylsulfide polymers (HB-PVS) as high
refractive index material and cellulose acetate as low refractive
index material. Solution processable HB-PVS show a near ultraviolet
absorption inducing an increased refractive index in the
visible-near infrared (n51.68, k51000 nm). HBPVS:Cellulose
Acetate Distributed Bragg Reflectors show a very clear fingerprint
of the photonic band gap possessing the expected polarized
dispersion properties as a function of the incidence angle.
Moreover, engineered microcavities tuned on the weak fluorescence
spectrum of the HB-PVS show directional fluorescence
enhancement effects due to spectral redistribution of the emission
oscillator strength. The combination of all these properties
testifies the high optical quality of the obtained photonic structures
thus indicating HB-PVS as an interesting material for the
preparation of such PhC. V
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