Studio di un sistema trigenerativo fotovoltaico a concentrazione per una media utenza del settore terziario

Il presente lavoro è stato svolto durante una attività di stage della durata di sei mesi presso la sede ENEL Produzione-Ricerca di Pisa ed ha avuto come oggetto lo studio della produzione energetica da fonte rinnovabile, in particolare solare. Il sistema che ha reso fruibile il potenziale energetico solare è stato un sistema trigenerativo fotovoltaico a concentrazione. Inizialmente si è fornita una descrizione dettagliata di cosa sono i sistemi fotovoltaici a concentrazione e di quali sono i componenti fondamentali, e allo stesso tempo innovativi, di tale tecnologia. In seguito è stato preso in considerazione un caso studio reale e partendo dai dati a disposizione si è per prima cosa caratterizzata l’utenza, per poi confrontare le richieste di questa con la produzione del sistema a concentrazione. E’ stata inoltre condotta una analisi economica sulla base degli attuali costi della tecnologia. I risultati ottenuti sono stati successivamente confrontati con quelli relativi ad una analisi economica di scenario sulla base delle previste variazioni future di costo della tecnologia stessa

Dental Educators’ Perceptions of Educational Learning Domains

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/153618/1/jddjde019010.pd

New MACRO results on atmospheric neutrino oscillations

The final results of the MACRO experiment on atmospheric neutrino oscillations are presented and discussed. The data concern different event topologies with average neutrino energies of ~3 and ~50 GeV. Multiple Coulomb Scattering of the high energy muons in absorbers was used to estimate the neutrino energy of each event. The angular distributions, the L/E_nu distribution, the particle ratios and the absolute fluxes all favour nu_mu --> nu_tau oscillations with maximal mixing and Delta m^2 =0.0023 eV^2. A discussion is made on the Monte Carlos used for the atmospheric neutrino flux. Some results on neutrino astrophysics are also briefly discussed.Comment: Invited Paper at the NANP03 Int. Conf., Dubna, 200

Wavelength-shifting fibers for calorimetric measurements in a long base line neutrino oscillation experiment

Abstract The NOE Collaboration has proposed a calorimeter to measure the energy of the final states of ν interaction events. The properties of long scintillator bars with wavelength-shifting fiber readout have been studied to develop a calorimeter design option. Various prototypes have been exposed to a cosmic rays stand. The total measured light yield in the middle of a 6 m -long fiber is about 15 photoelectrons. With this photon collection performance, it has been simulated that the calorimeter can achieve 17%/ E and 50%/ E resolutions for electrons and pions, respectively

Production of He-4 and (4) in Pb-Pb collisions at root(NN)-N-S=2.76 TeV at the LHC

Results on the production of He-4 and (4) nuclei in Pb-Pb collisions at root(NN)-N-S = 2.76 TeV in the rapidity range vertical bar y vertical bar <1, using the ALICE detector, are presented in this paper. The rapidity densities corresponding to 0-10% central events are found to be dN/dy4(He) = (0.8 +/- 0.4 (stat) +/- 0.3 (syst)) x 10(-6) and dN/dy4 = (1.1 +/- 0.4 (stat) +/- 0.2 (syst)) x 10(-6), respectively. This is in agreement with the statistical thermal model expectation assuming the same chemical freeze-out temperature (T-chem = 156 MeV) as for light hadrons. The measured ratio of (4)/He-4 is 1.4 +/- 0.8 (stat) +/- 0.5 (syst). (C) 2018 Published by Elsevier B.V.Peer reviewe

La sindrome dello stretto toracico superiore: case report

La nostra esperienza conferma la validità della terapia fisica, della rieducazione funzionale distrettuale e degli esercizi respiratori nella TOS, associati al trattamento farmacologico con neurotrofici. Il nostro protocollo riabilitativo ha consentito un ripristino delle ADL, una migliiore tolleranza allo sforzo e di conseguenza una migliore qualità di vita

Self-Organization Pathways and Spatial Heterogeneity in Insulin Amyloid Fibril Formation

At high temperature and low pH, the protein hormone insulin is highly prone to form amyloid fibrils, and for this reason it is widely used as a model system to study fibril formation mechanisms. In this work, we focused on insulin aggregation mechanisms occurring in HCl solutions (pH 1.6) at 60 °C. By means of in situ Thioflavin T (ThT) staining, the kinetics profiles were characterized as a function of the protein concentration, and two concurrent aggregation pathways were pointed out, being concentration dependent. In correspondence to these pathways, different morphologies of self-assembled protein molecules were detected by atomic force microscopy images also evidencing the presence of secondary nucleation processes as a peculiar mechanism for insulin fibrillation. Moreover, combining ThT fluorescence and light scattering, the early stages of the process were analyzed in the low concentration regime, pointing out a pronounced spatial heterogeneity in the formation of the first stable fibrils in solution and the onset of the secondary nucleation pathways

Protein aggregates for water purification

Water pollution is the contamination of water bodies including lakes, rivers, oceans and it is a leading global risk factor for illness and death for people, plants and living organisms. A principal source of water pollution is industry, from which increasing amounts of toxic pollutants are released including heavy metals such as cobalt, lead and copper. Today various technologies for purifying contaminated water can be applied, a lot of them being typically expensive, ion specific and characterised by low efficiency. For these reason, the search of new biocompatible materials with increased capabilities is strongly needed.Protein aggregates have already revealed their potential as environmentally friendly, biocompatible, flexible materials for different application ranging from scaffold for tissue engineering to drug delivery. In peculiar conditions, proteins may destabilise their structure and undergo different association processes leading to amyloid like aggregates. These highly ordered structures stabilised by H-bonds include fibrils, spherulites and particulates. By suitably varying solution conditions it is possible to tune aggregate size and morphologies as well as their physicochemical (hydrophobicity, hydrophilicity, swelling/deswelling properties) and mechanical properties. Amyloid fibrils have already revealed their potential for applications in water purification as fundamental components of carbon based filter membranes used for separating water from heavy metals. Here we present an experimental study where particulates are tested as new tuneable biomaterials for metal adsorption. Particulates are considered a generic state for protein aggregation they are perfectly spherical aggregates whose diameter ranges from hundreds nanometers to few microns. They can be readily formed at high temperature in water solutions at pHs close to the isoelectric point and have never been related to pathologies. We used spectroscopy and microscopy methods to characterize the aggregates formation, structure and morphologies. Inductively coupled plasma Optical Emission Spectroscopy (ICP – OES) and Differential Pulse Anodic Stripping Voltammetry (DP-ASV)techniques are used to evaluate uptake/release of metal ions in different conditions as a function of time and of adsorbate – adsorbent ratio in kinetic and thermodynamic experiments. The most used kinetic and isotherm equations were used to fit experimental data in order to obtain information about adsorption mechanism. Changing aggregation conditions and in turn molecular properties of aggregates, it is possible to highlight peculiar structural features essential for metal binding/adsorption. This knowledge can be used to develop efficient biomaterials for removing toxic heavy metal from wastewater, also, to exploit them for several cycles of purification with minimal reduction in performance