Modelli numerici per l'analisi sismica di edifici in muratura colpiti dal sisma Centro Italia 2016: confronto tra metodi ad elementi finiti e a telaio equivalente

Nella seguente tesi si affronta la simulazione della risposta al sisma di edifici esistenti in muratura tramite modellazione numerica. Viene confrontato un modello di tipo continuo ad elementi finiti con uno a telaio equivalente al fine di verificare eventuali criticità dei due approcci. Lo studio è condotto sul comportamento nel piano di una parete attraverso un'analisi statica non lineare, con indagini parametriche al variare dell'ipotesi di solai e di alcune caratteristiche geometriche

Accurate estimation of vehicle attitude for satellite tracking in ka band SOTM

The development of SOTM systems for land applications increases the need of use greater frequency (Ka band) : this introduces new problems related to land systems SOTM that do not appear in aeronautics applications. Among these, satellite tracking/pointing is a very critical aspect, above all in Ka band for which the maximum pointing error admitted is one tenth of degree: this does not allow the use of wide step tracking technique and it foist on the use of accurate open loop systems making use of inertial measurement system. In order to improve the performance of this system and making it accurate for Ka band, novel solution in the prediction of the vehicle attitude must be studied. In this paper the performance of inertial measurement system are enhanced by means of a fusion of sensor data and extended Kalman filters

Influence of the “wetting–drying” compaction on the adsorptive characteristics of nanosilica A-300

The methods of low-temperature 1 H NMR and IR spectroscopy, densitometry, and adsorption from solutions are applied to study the influence of “wetting–drying” compaction on the adsorptive characteristics of the nanosilica A-300 in relation to water and gelatin. It was shown that if the bulk density changes from 0.05 to 0.25 g/ml, the protein adsorptive capacity of the nanosilica decreases no more than by 30%, which, apparently, is connected with the decrease of the part of the surface, available for the protein molecules. Interfacial energy in relation to water increases from 37 to 52 mJ/m 2 if the bulk density increases and this is connected with the increase of the contribution from minor clusters (nanodrops) adsorbed on the surface water