187,975 research outputs found
Introduzione
No full textSi tratta dell'introduzione alla miscellanea in onore di G. Avarucci curata dallo stesso Borri e da R. M. Borraccini
Masonry wall panels retrofitted with thermal-insulating GFRP-reinforced jacketing
No full textToday there is a need to provide thermally efficient walls, while at the same time to increase the mechanical properties of old unreinforced masonry walls that will not require large amounts of energy in the retrofitting or deconstruction processes. To address this problem, this paper gives the results of shear tests carried out on masonry panels made of solid bricks retrofitted with a new technique based on the use of glass fiber-reinforced polymers (GFRP) grids inserted into a thermal insulating jacketing. This was made of different low-strength lime-based mortars. Tests were carried out in laboratory and results were used for the determination of the shear modulus and strength of the wall panels before and after the application of the GFRP reinforcement. Retrofitted panels exhibited a significant enhancement in the lateral capacity when compared to the control panels. The thermal performance of the proposed mortars was also investigated both with and without GFRP. Low values of thermal conductivity were found, especially for the samples with GFRP; a reduction of the thermal transmittance value in the 34–45 % range was also obtained by applying 45 mm layer of coating in conventional masonry walls
Shear strengthening of wall panels through jacketing with cement mortar reinforced by GFRP grids
No full textThis paper gives the results of a series of shear tests carried out on historic wall panels reinforced with an innovative technique by means of jacketing with GFRP (Glass Fiber Reinforced Plastics) mesh inserted into an inorganic matrix. Tests were carried out in situ on panels cut from three different historic buildings in Italy: two in double-leaf rough hewn rubble stone masonry in Umbria and L'Aquila and another with solid brick masonry in Emilia. Two widely-known test methods: the diagonal compression test and the shear-compression test with existing confinement stress. The test results enabled the determination of the shear strength of the masonry before and after the application of the reinforcement. The panels strengthened with the GFRP exhibited a significant improvement in lateral load-carrying capacity of up to 1060% when compared to the control panels. A numerical study assessed the global behavior and the stress evolution in the unreinforced and strengthened panels using a finite element code
Interaction of L-alpha-methyl-alpha-hydrazino-3,4 dihydroxyphenylpropionic acid with dopa-decarboxylase from pig kidney.
No full textInteraction of N-(DL-seryl)N'-(2,3,4-trihydroxybenzyl)-hydrazine with L-dopa decarboxylase from pig kidney.
No full textEvent-Triggered Control of Nonlinear Systems with Time-Varying State Delays
No full textNonlinear systems with time delays have been object
of intense investigation in the last decades for their ability of capturing
the behavior of many natural and engineering systems, including
ecological, biomedical, industrial, robotic, and networked
systems. In this article, a method for the event-triggered stabilization
in the sample-and-hold sense of nonlinear time-delay systems
with time-varying state delays is presented. The approach exploits
control Lyapunov–Razumikhin functions and a spline-based approximation
of the functional state feedback, resulting in a finitememory
controller that avoids (by construction) continuous-state
monitoring while ensuring also that the minimal interevent time
is strictly positive. Examples of application of the illustrated technique
highlight the potential of the approach taken
Analisi delle diversità del tipo di depressione tra ricoveri in reparto internistico e in Clinica delle Malattie Nervose e Mentali
No full textTowns and Identities in the Italian Eastland: 790 – 810
No full textUrban identities in Italy and the Adriati
Personality disorders and personality factors as predictors of quality of life and of cure parameters: one year follow-up
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