The University of Sannio is a university located in Benevento, Italy. Founded in 1998 , The University of Sannio is a modern and dynamic institution in constant evolution. It is a significant part of Benevento, a small town that offers a pleasant studying environment. With almost 8.000 students, the university gives the town a youthful spirit and vibrant atmosphere. It is organized in 4 Faculties and offers courses at undergraduate and postgraduate level in the fields of Law, Statistics, the Environment, Geology, Biology, Biotechnology, Civil Engineering, Computer Engineering, Energy Engineering, Electronic Engineering, Economics and Business Organization, always aiming for a very high qualification. Wikipedia.
Fiorillo F.,University of Sannio
Water Resources Management | Year: 2014
This study constitutes a review of spring hydrograph recession analysis, and it is focused on karst aquifers. The different literature models have been separated into empirical and physically-based models; in the last ones, only analytical models have been considered, as they provide the discharge equation during recession. Under constant geometrical and hydraulic aquifer characteristics, it has been found that the "exponential form" appears to be the most recurrent theoretical type, at least during the long-term flow recession. During this stage, any deviation from the exponential form, may suggest hydraulic anisotropy of actual aquifers, as well as aquifer geometry has a fundamental role in controlling the shape of spring hydrographs. The hydrodynamics of karst aquifer under recession has been described, associating any segment of the hydrograph to a specific hydrologic condition of the aquifer, and also to a specific physical law which control the water flow. © 2014 Springer Science+Business Media Dordrecht.
Graziano G.,University of Sannio
Physical Chemistry Chemical Physics | Year: 2010
A polypeptide chain can adopt very different conformations, a fundamental distinguishing feature of which is the water accessible surface area, WASA, that is a measure of the layer around the polypeptide chain where the center of water molecules cannot physically enter, generating a solvent-excluded volume effect. The large WASA decrease associated with the folding of a globular protein leads to a large decrease in the solvent-excluded volume, and so to a large increase in the configurational/translational freedom of water molecules. The latter is a quantity that depends upon temperature. Simple calculations over the -30 to 150 °C temperature range, where liquid water can exist at 1 atm, show that such a gain decreases significantly on lowering the temperature below 0 °C, paralleling the decrease in liquid water density. There will be a temperature where the destabilizing contribution of the polypeptide chain conformational entropy exactly matches the stabilizing contribution of the water configurational/translational entropy, leading to cold denaturation. © the Owner Societies 2010.
Graziano G.,University of Sannio
International Journal of Biological Macromolecules | Year: 2012
It is well known that sucrose stabilizes the native state of globular proteins against both chemical denaturants and temperature. A largely accepted explanation of sucrose-induced stabilization is not yet emerged. It is shown that the same theoretical approach able to rationalize the occurrence of cold denaturation, the contrasting role of GdmCl and Gdm 2SO 4, and the TMAO counteraction of urea denaturing activity [PCCP 12 (2010) 14245; PCCP 13 (2011) 12008; PCCP 13 (2011) 17689] works well also in the case of sucrose. The solvent-excluded volume effect plays the fundamental role because sucrose addition to water causes a marked increase in volume packing density due to the large size of sucrose molecules, that act as crowding agents. © 2011 Elsevier B.V.
Di Sarno L.,University of Sannio
Engineering Structures | Year: 2013
The basic approach for seismic design of structures utilizes a single loading scenario and a single performance criterion; usually life-safety. In recent years, social and economic considerations have necessitated that more than one performance criterion is used, and also more than one level of earthquake intensity. This multiple load-and-limit state seismic design is the current best practice. There are a few locations around the world that warrant an alternative approach. These locations are affected by more than one earthquake within a relatively short period of time due to their special seismo-tectonic setting. Few existing studies simply assume that the first earthquake will impose the maximum damage. An opportunity has presented itself to study the effect of multiple strong earthquakes on structures as a consequence to the exceptionally rich set of records obtained from the earthquake sequence of Tohoku (Japan), starting on March 2011. In this technical note, five stations are selected to represent a set of sites subjected to multiple earthquakes of varying magnitudes and source-to-site distances. From the tens of records captured at these five sites, three are selected for each site to represent scenarios of leading and trailing strong-ground motion. A leading set is where the first earthquake has the largest peak ground acceleration (PGA) in the sequence of three, while a trailing set has the second or third records as its highest PGA signal. A short list of earthquake response parameters is selected, and the records are treated in two different manners. Inelastic constant ductility spectra for acceleration response are examined, alongside force reduction factor spectra. The final part of the technical note is a reinforced concrete (RC) frame analysis subjected to the same set of ground motions used for the response spectra. The inelastic response and force reduction factor spectra, alongside the inelastic response of the RC frame, not only confirm that multiple earthquakes deserve extensive and urgent studies, but also give indications of the levels of lack of conservatism in the safety of conventionally-designed structures when subjected to multiple earthquakes. © 2013 Elsevier Ltd.
Stabile A.,University of Sannio
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010
The Newtonian limit of the most general fourth-order gravity is performed with the metric approach in the Jordan frame with no gauge condition. The most general theory with fourth-order differential equations is obtained by generalizing the f(R) term in the action with a generic function containing two other curvature invariants: the Ricci square (R αβRαβ) and the Riemann square (R αβγδRαβγδ). The spherically symmetric solutions of the metric tensor present Yukawa-like spatial behavior, but now one has two characteristic lengths. At Newtonian order any function of curvature invariants gives us the same outcome like the so-called quadratic Lagrangian of gravity. From the Gauss-Bonnet invariant one will have an incomplete interpretation of the solutions and the absence of a possible third characteristic length linked to the Riemann square contribution. From the analysis of metric potentials, generated by a pointlike source, one has a constraint condition on the derivatives of f with respect to scalar invariants. © 2010 The American Physical Society.