87,340 research outputs found
Dall'Informatica umanistica alle culture digitali. Atti del convegno di studi (Roma, 27-28 ottobre 2011) in memoria di Giuseppe Gigliozzi, a cura di Fabio Ciotti e Gianfranco Crupi
No full textLaser irradiation of ZnO:Al/Ag/ZnO:Al multilayers for electrical isolation in thin film photovoltaics
No full textLaser irradiation of ZnO:Al/Ag/ZnO:Al transparent contacts is investigated for segmentation purposes. The quality of the irradiated areas has been experimentally evaluated by separation resistance measurements, and the results are complemented with a thermal model used for numerical simulations of the laser process. The presence of the Ag interlayer plays two key effects on the laser scribing process by increasing the maximum temperature reached in the structure and accelerating the cool down process. These evidences can promote the use of ultra-thin ZnO:Al/ Ag/ZnO:Al electrode in large-area products, such as for solar modules. © 2013 Crupi et al.; licensee Springer
Formal and Empirical Methods in Philosophy of Science
No full textThis essay addresses the methodology of philosophy of science and illustrates how formal and empirical methods can be fruitfully combined. Special emphasis is given to the application of experimental methods to confirmation theory and to recent work on the conjunction fallacy, a key topic in the rationality debate arising from research in cognitive psychology. Several other issue can be studied in this way. In the concluding section, a brief outline is provided of three further examples
Low frequency noise and gate bias instability in normally off AlGaN/GaN HEMTs
No full textIn this brief, traps-related dispersion phenomena are investigated on GaN/AlGaN MOS-high-electron mobility transistors. Pulsed I-V characteristics and low-frequency-noise measurements are the characterization vehicles used to get a direct insight of the device trap-states. By considering a set of ten samples, device-to-device fluctuation parameters extracted from trap-related measurements (1/f noise and gate bias instability) are systematically compared with conventional electrical parameters (threshold voltage and ON-current). Two separate trends are identified and ascribed to two different trap families
Dall'Informatica umanistica alle culture digitali. Atti del convegno di studi (Roma, 27-28 ottobre 2011) in memoria di Giuseppe Gigliozzi
No full textThe Linked TEI: Text Encoding in the Web. TEI Conference and Members Meeting 2013: October 2-5, Rome
No full textInvestigation on the Tensile Properties of Virgin and Recycled HDPE for Boatbuilding Applications Through Experimental Tests
No full textThe search for novel materials suitable for the construction of boat structures and components has acquired paramount importance in the last few years, driven by technological developments in terms of processes and formulations. Particularly, specific types of plastics have attracted attention due to manufacturing techniques that are able to exploit the material’s mechanical properties at their best while ensuring execution simplicity and precision. This is the case of High-Density Polyethylene, commonly known with its acronym HDPE and increasingly used for the construction of small workboats. The numerous positive features of HDPE for marine applications can be summed up in high flexibility, toughness and durability, anti-corrosion properties, and excellent resistance to marine growth. In addition, HDPE can be recycled in several ways for different applications and may give origin to regenerated polyethylene as well, positioning itself in a market that favours materials capable of increasing the eco-sustainability of the final products. Despite all these benefits, the quite limited knowledge and expertise related to the different formulations of the materials available on the market and the presence of several suppliers can lead to incorrect applications that might jeopardise its large-scale diffusion. Moreover, the properties of regenerated HDPE must be thoroughly investigated to understand its potential scope of use. For these reasons, almost all Ship Classification Societies are still working on proper regulations applicable to this material, with some tentative proposals from RINA and Bureau Veritas. The present paper aims to fit into this context by presenting a mechanical characterisation activity to evaluate tensile properties of both virgin and recycled materials through experimental tests. After describing the different types of HDPE employed, the authors present the testing approach and its results
Optimization of a Green Extraction of Polyphenols from Sweet Cherry (Prunus avium L.) Pulp
No full textThis work focused on the optimization of the ultrasound (US) extraction of polyphenols from sweet cherry pulp by monitoring cyanidin-3O-rutinoside, quercetin-3O-rutinoside, and trans-3-O-coumaroylquinic acid, representing the main anthocyanin, flavonol, and hydroxycinnamate, respectively, identified in the extracts through chromatographic analyses (HPLC-DAD), as output variables. The optimization was performed following a two-level central composite design and the influence of the selected independent variables (i.e., extraction time and solid to solvent ratio) was checked through the response surface methodology. The maximum recovery of the phenolic compounds was obtained at 3 min and 0.25 g/mL in water/ethanol (1:1, v/v) at a set temperature (25 °C), sonication power (100 W), and sonication frequency (37 kHz). Subsequent validation experiments proved the effectiveness and reliability of the gathered mathematical models in defining the best ultrasound-assisted extraction conditions
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