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224 results on '"Frediani, M"'

4. Comparison of different processing methods to prepare poly(lactid acid)-hydrotalcite composites

Author

Scaffaro, R., Botta, L., Passaglia, E., Oberhauser, W., Frediani, M., and Di Landro, L.

Subjects
Lactic acid -- Usage, Polymeric composites -- Production processes -- Comparative analysis, Engineering and manufacturing industries, Science and technology
Abstract

The effect of the compounding method on the morphology and on the properties of poly(lactic acid) (PLA)-hydrotalcite (HT) composites was studied. Moreover, the influence of two different kinds of HT--organically modified (OM-HT) and unmodified (U-HT)--and their concentration was evaluated. The composites were prepared using either a single screw extruder (SSE), a counter rotating twin-screw compounder (TSC) or a corotating twin-screw extruder (TSE). The prepared materials were characterized by scanning electron microscopy, gel permeation chromatography (GPC) analysis, mechanical and rheological measurements. The results indicated that the best morphology, i.e., particles dimension and distribution, is exhibited by materials prepared by TSE while the worse ones by the samples processed by SSE. The viscosity of all the materials containing the HT is lower in comparison with the viscosity exhibited by the neat matrix, in particular, when the OM-HT is used. These results were correlated to degradation phenomena occurring during the processing of the materials as revealed by the results of GPC analysis. The addition of HT caused only a slight increase of elastic modulus of filled materials even when 5% of filler was incorporated. However, in full agreement with morphological analyses, the best performances were exhibited by materials prepared by TSE while the worse ones by the samples processed by SSE., INTRODUCTION Over the past decades there has been a growing interest toward polymeric materials obtained by renewable sources and with potential biodegradability or compost-ability to reduce the overall environmental impact [...]

Published
2014
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15. Microsatellite markers are powerful tools for discriminating among olive cultivars and assigning them to geographically defined populations

Author

Sarri, V., Baldoni, L., Porceddu, A., Cultrera, N.G.M., Contento, A., Frediani, M., Belaj, A., Trujillo, I., and Cionini, P.G.

Subjects
Population genetics -- Research, Olive -- Genetic aspects, Olive -- Research, Nucleotide sequence -- Research, Biological sciences
Abstract

Abstract: Twelve simple sequence repeat (SSR) loci were used to differentiate among 118 cultivars sampled in several countries of the Mediterranean basin and to analyze the genetic structure of olive [...]

Published
2006

26. On the use of hydrotalcite in PLA based composites

Author

BOTTA, Luigi, SCAFFARO, Roberto, Passaglia, E, Oberhauser, W, Frediani, M, Di Landro, L., Botta, L, Scaffaro, R, Passaglia, E, Oberhauser, W, Frediani, M, and Di Landro, L

Subjects
PLA, hydrotalcite, composites
Published
2012

30. Using NWP simulations in satellite rainfall estimation of heavy precipitation events over mountainous areas

Author

Zhang, X. Anagnostou, E.N. Frediani, M. Solomos, S. Kallos, G.

Abstract

In this study, the authors investigate the use of high-resolution simulations from the Weather Research and Forecasting Model (WRF) for evaluating satellite rainfall biases of flood-inducing storms in mountainous areas. A probability matching approach is applied to evaluate a power-law relationship between satelliteretrieved and WRF-simulated rain rates over the storm domain. Satellite rainfall in this study is from the NOAA Climate Prediction Center morphing technique (CMORPH). Results are presented based on analyses of five heavy precipitation events that induced flash floods in northern Italy and southern France complex terrain basins. The WRF-based adjusted CMORPH rain rates exhibited improved error statistics against independent radar rainfall estimates. The authors show that the adjustment procedure reduces the underestimation of high rain rates, thus moderating the magnitude dependence of CMORPH rainfall bias. The Heidke skill score for the WRF-based adjusted CMORPH was consistently higher for a range of rain rate thresholds. This is an indication that the adjustment procedure ameliorates the satellite rain rates to provide a better estimation. Results also indicate that the low rain detection of CMORPH technique is also identifiable in the WRF-CMORPH comparison; however, the adjustment procedure herein does not incorporate this effect on the satellite rainfall bias adjustment. © 2013 American Meteorological Society.

Published
2013

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