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2nd International Conference on: "Times of Polymer - TOP" June 20-23, 2004 Ischia (Italy)
No full textThe 2nd International Conference on 'Times of Polymer', which was held at at the Congress Center of the Continental Terme Hotel Ischia, Italy, from 20-23 June is discussed. The Italian Associations of Materials (AIMAT) and Macromolecules (AIM), the Italian Society of Rheology and the National Institute of Materials Science and Technology (INSTM) sponsored the Conference and funding was received from INSTM. The conference had a primary objective the meeting of a number of scientists working within the area of timescale of polymers. The scientific program started with the lecture by Prof. Alberto D'Amore on 'Mathematical modeling and Numerical Evaluation of Relaxation-Induced Residual Stress in Amorphous Polymers'
Flexural fatigue behaviour of random continuous fibre reinforced thermoplastic composites
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Flexural fatigue behaviour of random continuous fibre reinforced thermoplastic composites
No full textDeconvolution of the segmental and chain modes in amorphous polymers: Do the short-chain modes affect the bulk relaxation?
No full textA new method for calculating the retardation spectra for linear viscoelastic materials is presented. The method uses the analytical expressions among the viscoelastic functions through the numerical evaluation of the Inverse Laplace Transform (ILT) with the Gaver–Wynn–Rho (GWR) algorithm. It is applied to study three polymers' relaxation mechanisms: a star Polystyrene and two Polycyanurate networks with two different crosslink densities. The shear spectrum is de-convoluted to separate the segmental and the chain modes responsible for the softening dispersion. The retardation mechanisms extracted from the shear response are then compared with the volumetric bulk response. The results show that the shear segmental contribution is narrower than the volumetric bulk response and finishes about two decades before the shoulder's appearance in the shear retardation spectrum. Thus, the volumetric bulk response, mainly exerted by the segmental mode, is also affected at long times by the short time chain mechanism, usually claimed to be Sub-Rouse modes
Traffic models for traffic control in urban areas
No full textAbstractThe paper deals with state models with queues as state variables, which are the most appropriate ones to describe traffic controlled by signal settings, as it is in urban areas. In a first part, several features are scanned which are relevant in analizing traffic conditions in urban areas on the base of a general model. Then the “free-flow” condition is defined, and some results are derived about its properties and on the influence the control variables may have on it. Finally a class of normative models is presented for periodic traffic control problems, which prescribe conditions for the control variables in order to guarantee free-flow
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