102,002 research outputs found
"Arte dinamica del tempo fascista": il futurismo di Corrado Forlin
No full textL'intervento ricostruisce in sintesi la vicenda storico artistica di Corrado Forlin, fondatore insieme a Italo Fasolo del Gruppo futurista Savarè (1936-1942), che espose alle Biennali Internazionali di Venezia e alle Quadriennali di Roma
Le sequenze medievali nei saggi F e G
No full textIl capitolo presenta i risultati degli scavi delle fasi medievali del complesso monumentale di epoca romana di via Neroniana a Montegrotto Terme
Evolutionary experiments for self-assembling amphiphilic systems
No full textSome amphiphilic molecules in particular environments may self-assemble and originate chemical entities, such as vesicles, which are relevant in technological applications. Experimentation in this field is difficult because of the high dimensionality of the search space and the high cost of each experiment. To tackle the problem of designing a relatively small number of experiments to achieve the relevant information on the problem, we propose an evolutionary design of experiments based on a genetic algorithm. We built a particular algorithm where design and laboratory experimentation interact leading the search toward the optimality region of the space. To get insight in the process we then modelled the experimental results with different classes of regression models; from modelling we could identify the special role played by some molecules and the relevance of their relative weight in the composition. With modelling we “virtually” explored the experimental space and predicted compositions likely to generate very high yields. Models then provide valuable information for the redesign of the experiments and can be considered as an essential addition to the evolutionary approach
Tribological and electrochemical performances of HVOF sprayed NbC-NiCr coatings
No full textA wide range of mechanical parts are protected against wear and corrosion by thermally sprayed WC- or Cr3C2-based hardmetals. However, little is known about the potential of other hardmetal coating formulations. Since promising results were obtained with bulk NbC-based hardmetal cutting tools, in this work we investigated NbC-based coatings, which have not been reported yet in the literature. NbC particles were homogeneously dispersed with volume fractions of 25 % and 40 % in a Ni-20wt.%Cr matrix by mechanical alloying, and the resulting powders were sprayed onto stainless steel substrates by the High-Velocity Oxygen Fuel (HVOF) process.Irrespective of the process parameters, the coatings exhibit low porosity (<1 vol%) and hardness values of about 900 HV0.3 (NbC-25NiCr) and 1000 HV0.3 (NbC-40NiCr). The composition with higher amount of NbC phase is less hard because its greater brittleness results in cracking during indentation.The sliding wear resistance of the NbC-based coatings, tested by ball-on-disc tribometry from room temperature up to 600 degrees C, is generally intermediate between that of WC-CoCr and Cr3C2-NiCr references, and it is usually comparable to that of TiC-NiCr, another type of alternative hardmetal coating, tested in our previous work. Though the NbC-NiCr coatings exhibited limited three-body abrasion resistance due to the occurrence of some brittle fracture together with ductile grooving, they offer a particularly interesting performance at 400 degrees C, with lower wear rates than Cr3C2-NiCr and TiC-NiCr.Additionally, the NbC-NiCr coatings tested in this work, especially the one with 40 vol% matrix phase, exhibit excellent corrosion resistance. Corrosion current densities (similar to 0.1 mu A/cm(2)) and passive current densities (<1 mu A/cm(2)), both obtained by electrochemical polarization tests, were lower than the corresponding values found for all reference coatings (WC-CoCr, Cr3C2-NiCr and TiC-NiCr),Thus, the NbC-NiCr coatings are promising for applications where a good balance between corrosion resistance and wear resistance over a range of temperatures is required
Fig 2 -
No full textExamples of seismic damage and restoration observed at El Castillejo: A-B: shear cracks in Building 4; C: horizontally-shifted block of rammed earth in Building 3; D: tilted block of the outer wall; E: broken and displaced wall in Building 30; F: post-earthquake restoration of the western gatehouse and G: Building 10. Photographs by P. Forlin.</p
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
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