Search results for "scienza"

Comparisons of processing and strength properties of two adhesive systems for composite joints

2007

Abstract In the present study rheological, static and impact tests are carried out on two adhesive resins usually employed in marine applications; then single lap joint tests are conducted on composites joints evidencing the effect of the curing time of both resins on the mechanical properties of the joint. The applicability and workability conditions of the adhesive resins are determined evaluating the curing evolution by a preliminary rheological analysis; then the relation of curing properties with the mechanical performances of the resins themselves and with ones of the composite joints is estimated. Static flexural and Izod impact tests are performed on the resins at increasing time af…

Quasi-Fractional Models of Human Tendons Hereditariness

2018

In this study, the authors, after collecting a series of experimental evidences following a creep and relaxation tendon campaign, propose a non-linear model of the viscoelastic behavior of the tendons. The ligaments investigated are the patellars and the hamstrings. The analytical model proposed by the authors aims to explain the non-linear hereditary behavior of these tissues and proposes an approach with which to develop a hereditary fractional-order non-linear model.

Compositi di PVC-Ag con proprietà antimicrobiche

2009

Nanoscale mechanical characterization of polymers by atomic force microscopy (AFM) nanoindentations: Viscoelastic characterization on a model material

2009

The Atomic Force Microscope (AFM), apart form its conventional use as a microscope, is also used for the characterization of the local mechanical properties of polymers. In fact, the elastic characterization of purely elastic materials using this instrument can be considered as a well assessed technique while the challenge remains the characterization of the viscoelastic mechanical properties. In particular, one finds the mechanical behavior changing when performing indentations at different loading rates, i.e., on different time scales. Moreover, this apparent viscoelastic behavior can also be due to complex contact mechanics phenomena, with the onset of plasticity and long-term viscoelast…

Ars curandi. Prospettive di filosofia della medicina

2011

Sulla scorta di alcuni scritti di H.-G. Gadamer, H. Jonas e R. Spaemann, nel presente saggio si teorizza una concezione “neo-ippocratica” dell’atto medico, in cui le istanze di umanizzazione e le esigenze di rigore scientifico sembrano riconciliate nel celebre detto “medicus curat, natura sanat”. Al di là di ogni indebita medicalizzazione dell’esistenza, infatti, l’arte medica saprà mostrare il suo volto umano nella misura in cui, orientandosi non alla ma-nipolazione dell’organismo ma alla sua cura e alla sua guarigione, riscoprirà, nel cuore dell’antica nozione di physis, quell’“armonia nascosta” che, ancora oggi, rappresenta lo scopo e al tempo stesso il limite del suo esercizio.

Il costruttivismo. La rivalutazione delle idee nelle relazioni internazionali

2021

The chapter traces the roots and evolution of constructivism, the defining features and the value added to IR theory. It also presents some contributions by constructivst scholars and identifies challenges.

A route to agnosticism in mathematics

Dynamic shakedown design of structures under repeated seismic loads

2013

The paper is devoted to the formulation of an optimal design (minimum volume) problem of elastic perfectly plastic structures subjected to suitable combinations of static (fixed) and dynamic (seismic) loads. The structure is constrained to simultaneously respect two different safety criteria; actually, it must exhibit an elastic shakedown behaviour for the combination of loads characterizing the serviceability conditions and it must prevent the instantaneous collapse for the highest expected load condition (combination of loads characterized by the presence of fixed loads and maximum expected intensity of seismic action). The shakedown limit behaviour for the optimal structure will be impos…

Comparison between unrestricted dynamic shakedown design and a new probabilistic approach for structures under seismic loadings

2014

The paper concerns a study related to the comparison between two different approaches utilized for the formulation of an optimal shakedown design problem for elastic plastic frame structures subjected to a combination of fixed and seismic loading. The first formulation utilizes the unrestricted dynamic shakedown theory, while the second one is based on a new probabilistic approach. The comparison is effected in terms of mathematical formulations, in terms of adopted loading models and in terms of numerical results. The performed applications are related to plane steel frames.

AN EMPIRICAL ANALYSIS OF THE PUBLIC SPENDING DECOMPOSITION ON ORGANIZED CRIME

2016

The aim of this paper is to investigate, empirically, what components of the public spending imply a decreasing effect on the organized crime and what components create opportunities for the organized crime, discussing also the role of government effciency. The findings show a strikingly consistent pattern. Organized crime mainly operates in the distribution of the public spending for health, housing and community amenities. There is a decreasing effect on organized crime of the public expenditure devoted to education and to create morality values, such as the expenditure for recreation, culture and religion. Finally, government efficiency in public spending is beneficial for reducing the o…