Search results for "cienza"
showing 10 items of 1535 documents
Recycling of a starch-based biodegradable polymer
2002
A new starch-based polymeric system, ZI1OU from Novamont, mainly composed of starch and polycaprolactone, was reprocessed several times in an extruder to investigate the recyclability of this biodegradable polymer. A previous investigation of the thermomechanical degradation in a mixer has been also done. The degradation is mostly due to the thermal stress but the presence of the mechanical stress strongly increases the degradation kinetic. During melt processing two concurrent processes take place: the first is the degradation, i.e. the breaking and shortening of polymeric chains, mostly occurring in the PCL phase; the second is the formation of some crosslinked structure in the starch pha…
Il cinema didattico di Roberto Omegna tra propaganda fascista e divulgazione scientifica
2019
Il seguente articolo parla dei film scientifici ed educativi prodotti da Roberto Omegna per l’Istituto Luce durante il periodo fascista. Dall’analisi dei documentari emergono due prospettive: quella dello scienziato, il cui orientamento era positivista, e quello del regime, che tentò di strumentalizzare le pellicole scientifiche a scopi propagandistici. Rimanendo fedele a se stesso e alla verità dei fatti che desiderava produrre attraverso i suoi film, Omegna fu il pioniere di una pedagogia documentaristica che vedeva nella divulgazione scientifica un modo per condurre le nuove generazioni sulla via del progresso. The following paper is about the scientific and educational movies produced b…
OPUNTIA FICUS INDICA/MATER-BI® BASED GREEN COMPOSITES FOR FERTILIZER CONTROLLED RELEASE DEVICES PRODUCTION
Fractional Spectral Moments for Digital Simulation of Multivariate Wind Velocity Fields
2012
In this paper, a method for the digital simulation of wind velocity fields by Fractional Spectral Moment function is proposed. It is shown that by constructing a digital filter whose coefficients are the fractional spectral moments, it is possible to simulate samples of the target process as superposition of Riesz fractional derivatives of a Gaussian white noise processes. The key of this simulation technique is the generalized Taylor expansion proposed by the authors. The method is extended to multivariate processes and practical issues on the implementation of the method are reported.
A novel exact representation of stationary colored Gaussian processes (fractional differential approach)
2010
A novel representation of functions, called generalized Taylor form, is applied to the filtering of white noise processes. It is shown that every Gaussian colored noise can be expressed as the output of a set of linear fractional stochastic differential equations whose solution is a weighted sum of fractional Brownian motions. The exact form of the weighting coefficients is given and it is shown that it is related to the fractional moments of the target spectral density of the colored noise.
Drilling characteristics and properties analysis of fiber reinforced polymer composites: A comprehensive review
2023
Fiber-reinforced polymer (FRP) composites play a vital role in the production of structural and semi-structural components for engineering applications. The drilling process is a commonly employed machining process for FRP composites to join the FRP structural elements. Usually, the FRP composites possess a heterogeneous nature because of their multi-layered structure, hybridization, and the presence of multi-phase materials. Hence, common problems like delaminations, fuzzing, buckling, cracking, matrix and fiber burning occur during the drilling operations. These problems cause dimensional inaccuracy, poor surface finish, and tool wear and reduce the mechanical strength of the composites. …
Influenza del confinamento del calcestruzzo con FRP sulla stabilità delle barre compresse
2009
Effect of Short-Term and UV Irradiation Aging on the Behaviour of SBS-Modified Bitumen
2022
To obtain road bitumen with improved temperature and fatigue resistance, polymers and/or rubbers could be added to it. A particularly suitable polymer for bitumen modification is styrene-butadiene-styrene (SBS) copolymer but limited information is available about the ageing behaviour of modified binders. In this work, two neat bitumens, with different penetration grades, and two SBS-modified bitumens, containing different SBS amounts, were selected, and their short-term and UVB ageing behaviour were investigated considering dynamic shear rheometry and Attenuated Total Reflectance-Fourier Transformation InfraRed spectroscopy (ATR-FTIR). Short-time ageing behaviour was investigated performing…
UN METODO INNOVATIVO DI ANALISI MODALE OPERATIVA PER L’IDENTIFICAZIONE STRUTTURALE
2022
L'ingegner Zamjatin e la rivolta della fantasia
2012
Evgenii Zamiatin worked as an engineer while pursuing his literary career; in the eyes of his contemporaries, this was one relevant trait of his image. His masterpiece, the novel “We”, however, depicts a deeply pessimistic picture of an over-rational future society. This depiction contains, moreover, a number of attributes that can be traced back to Zamiatin's satirical picture of England in his novella “The Islanders”. Was this meant to be a warning against the dangers of technology, or against the developments of the bolshevik westernizing ideology? Was this engineer an enemy of rational thinking? The language of mathematics plays a relevant role in the novel's figural system; maybe, part…