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Department of Information Engineering (DII)
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Department of Life and Environmental Sciences - DiSVA
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  • [Show abstract] [Hide abstract]
    ABSTRACT: Among the methods available for repairing or strengthening reinforced concrete (RC) beams, the Near Surface Mounted (NSM) technique has been shown to be a suitable method in many cases. Nevertheless, the effect of tensile concrete cracking on the bond mechanisms of Fiber Reinforced Polymer (FRP) rods in rod-resin interfaces and/or in resin concrete interfaces has yet to be investigated. This paper analyses the effects of damages due to bending cracking of concrete and loss of bond of NSM carbon-FRP (CFRP) rectangular rods on the static and dynamic responses of strengthened RC beams. Occurrence of damage in a reinforced concrete element leads to changes in its dynamic response. In many cases, experimental vibration monitoring of strengthening through dynamic tests is a convenient, non-destructive method. An investigation was developed to evaluate the experimental vibration changes of RC beams; three beams were built and examined experimentally by static tests and free vibration. One non-strengthened beam was tested to evaluate frequency value changes due to cracking at increasing bending moment. Two beams were strengthened with NSM CFRP rectangular rods: one was built without defects and one was strengthened with an imposed damage simulating loss of adhesion damage. Comparison between experimental and theoretical frequency values for three beams and the analysis of frequency changes due to damage for bending cracks and loss of adhesion allow discussing the actual behavior of RC beams with NSM CFRP rods.
    Composites Part B Engineering 12/2014; 67:95–110.
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    ABSTRACT: The North Adriatic Sea is a shallow basin characterized by peculiar trophic and hydrologic conditions affecting the composition, species abundance and seasonal cycles of the benthic assemblages. Due to high productivity rates comparable to those of the north seas, here the benthic organisms reach sizes or densities significantly higher than the same species observed in other Mediterranean localities and show wider periods of reproduction. Concerning the dynamics of zoanthids, there are very few studies about these Mediterranean species, and this research is the first on the abundance and reproduction of Epizoanthus arenaceus. The zoanthid from shallow waters of the NW Adriatic Sea has a maximum abundance of 25,000 polyps m− 2 (about 40 g C m− 2). E. arenaceus shows a growth phase during winter and a regression period from summer to autumn coinciding with gametogenesis. During summer, the decreases in current intensity and prey concentration combined with the increase in the reproductive effort may cause shrinkage and fission/fragmentation of the colonies. On the contrary, the maturation and release of gametes are positively correlated with the temperature trend. A temporal and spatial separation of the production of male and female gametes was observed, leading us to hypothesize that temperature could affect sex determination. The comparison of patterns in abundance and reproduction at 3–4 m and 6–7 m shows that the shallower colonies seem to be more sensitive to extreme values of temperature. The NW sector of the Adriatic Sea, vulnerable to severe anthropogenic pressure and subject to frequent thermal anomalies, is particularly prone to the mortality episodes of benthic organisms. For these reasons, the study of the dynamics of invertebrates from this area is crucial to forecast the effects of environmental changes in the entire Mediterranean basin.
    Journal of Experimental Marine Biology and Ecology 12/2014; 461:144–153.
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    ABSTRACT: This study compares the environmental impacts related to the production of cotton yarn from cultivation to washing and drying, when cotton is supplied by four companies located in four different countries (Egypt, China, India and the USA). Interesting results have been obtained from cultivation scenarios where the productivity influences the value of the environmental impact associated to each country. The highest greenhouse effect is produced by the Indian company, with 0.89 kg of CO2 equivalent (per 1 kg of cotton). Fuel consumption and Ammonium nitrate are the first items of greenhouse effect in all companies because of their extensive use and the lack of rotation with other unprofitable crops. In Chinese and Egyptian companies the irrigation sources are severely threatened and it is necessary to switch from a flood irrigation to a drip irrigation system. The production phase of cotton yarn provides an impact equal to 2.81 CO2 kg-equivalent. The most critical impacts of cotton yarn production are due to Dyeing (1.24 CO2 kg-eq.) and Spinning (0.64 CO2 kg-eq.) phases and they are essentially connected to reactive reagents and pigments, electrical and thermal energy. Regarding thermal energy consumptions some improvements in dyeing plants (recover cooling water, return steam condensate to boilers or reuse different process waters) may allow the company to decrease in CO2 emission by 41.7%. Moreover a reduction in CO2 emission by 34.6% can be achieved in the spinning phase using an optimized suction tube in conjunction with adjustable inverter control.
    Journal of Cleaner Production 11/2014; 82:154–165.


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  • Head of Institution
    Sauro Longhi
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Journal of Bioactive and Compatible Polymers 01/2011; 26(4):420-434.
Process Biochemistry. 01/2005;

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