174 research outputs found
Oltre la Moffa: linee educative
No full textDopo una nota storica sul noviziato orionino Maria Immacolata di Villa Moffa di Bandito di Bra (Cuneo), si pubblica un resoconto del 1912 dell'incontro di don Luigi Orione con i suoi collaboratori sugli orientamenti disciplinari e pedagogici benedettino-salesiani delle case della congregazione.After a historical note on the Villa Moffa’s novitiate, called "Maria Immacolata", at Bandito di Bra (Cuneo), it is published an account, dated 1912, of the meeting of Don Luigi Orione with his staff on the disciplinary and pedagogical guidelines, related to the benedectine and salesian teaching of houses of his congregation
Con la Barba o senza? Effetti sulla Credibilità dei Testimonial Pubblicitari e sull’Intenzione d’Acquisto
No full text
Optical gain in the near infrared by light-emitting electrospun fibers
No full textThe potential integration of polymer nanofibers in photonic devices and circuits is a major driver for research on their waveguiding and optical gain properties. Emission in the near‐infrared is especially important in this framework in view of the realization of nanofiber‐based optical amplifiers. Here, the optical gain properties of electrospun fibers embedding near‐infrared light‐emitting molecules are investigated. Upon pulsed optical pumping, line narrowing typical of amplified spontaneous emission is observed, with gain of 5.5 cm−1 and threshold fluence down to 0.25 mJ cm−2. Importantly, the stimulated emission characteristics are strongly dependent on individual fiber characteristics and on the mutual alignment of nanofibers in arrays, thus being tailorable through the fiber architecture and assembling. These results open interesting perspectives for the exploitation of electrospun fibers as active components in the near‐infrared range
All-optical switching in dye-doped DNA nanofibers
No full textAll-optical switches are introduced which are based on deoxyribonucleic acid (DNA) in the form of electrospun fibers, where DNA is semi-intercalated with a push-pull, luminescent nonlinear pyrazoline derivative. Optical birefringence is found in the organic nanofibers, with fully reversible switching controlled through continuous-wave laser irradiation. The photoinduced signal is remarkably large, with birefringence highlighted by optically-driven refractive index anisotropy approaching 0.001. Sub-millisecond characteristic switching times are found. Integrating dye-intercalated DNA complex systems in organic nanofibers, as a convenient and efficient approach to template molecular organization and control it by external stimuli, might open new routes for realizing optical logic gates, reconfigurable photonic networks and sensors through physically-transient biopolymer components
IL NUOVO "ESERCITO INDUSTRIALE DI RISERVA". Il ruolo degli immigrati nel mercato del lavoro. La realtà e gli ideologismi della Sociologia "progressista".
No full textElectrospun Amplified Fiber Optics
No full textABSTRACT: All-optical signal processing is the focus of much research aiming to obtain effective alternatives to existing data transmission platforms. Amplification of light in fiber optics, such as in Erbium-doped fiber amplifiers, is especially important for efficient signal transmission. However, the complex fabrication methods involving high-temperature processes performed in a highly pure environment slow the fabrication process and make amplified components expensive with respect to an ideal, high-throughput, room temperature production. Here, we report on near-infrared polymer fiber amplifiers working over a band of ∼20 nm. The fibers are cheap, spun with a process entirely carried out at room temperature, and shown to have amplified spontaneous emission with good gain coefficients and low levels of optical losses (a few cm−1). The amplification process is favored by high fiber quality and low self-absorption. The found performance metrics appear to be suitable for short-distance operations, and the large variety of commercially available doping dyes might allow for effective multiwavelength operations by electrospun amplified fiber optics
Passato e presente. Progettazione di manufatti tipo per la conservazione e la fruizione di un'area di cava dismessa di valenza storica ubicata ad alta quota nel Parco Regionale delle Alpi Apuane.
No full textSi studiano le potenzialità di valorizzazione delle risorse ambientali di un sito di cava.
Cave antiche, soleggiamento, vento, terreno, materiali abbandonati nei ravaneti possono generare le caratteristiche dell'architettura anche ai fini della sostenibilità
"Il III° Libro del Capitale alla prova empirica della storia: capitale finanziario e commerciale nella vicenda di Suez"
No full textRatiometric Organic Fibers for Localized and Reversible Ion Sensing with Micrometer-Scale Spatial Resolution
No full textA fundamental issue in biomedical and environmental sciences is the development of sensitive and robust sensors able to probe the analyte of interest, under physiological and pathological conditions or in environmental samples, and with very high spatial resolution. In this work, novel hybrid organic fibers that can effectively report the analyte concentration within the local microenvironment are reported. The nanostructured and flexible wires are prepared by embedding fluorescent pH sensors based on seminaphtho-rhodafluor-1-dextran conjugate. By adjusting capsule/polymer ratio and spinning conditions, the diameter of the fibers and the alignment of the reporting capsules are both tuned. The hybrid wires display excellent stability, high sensitivity, as well as reversible response, and their operation relies on effective diffusional kinetic coupling of the sensing regions and the embedding polymer matrix. These devices are believed to be a powerful new sensing platform for clinical diagnostics, bioassays and environmental monitoring
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