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Search Results: 1 - 10 of 208866 matches for " L. Carbone "
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Microstructured superhydrorepellent surfaces: Effect of drop pressure on fakir-state stability and apparent contact angles
L. Afferrante,G. Carbone
Physics , 2009, DOI: 10.1088/0953-8984/22/32/325107
Abstract: In this paper we present a generalized Cassi-Baxter equation to take into account the effect of drop pressure on the apparent contact angle theta_{app}. Also we determine the limiting pressure p_{W} which causes the impalement transition to the Wenzel state and the pull-off pressure p_{out} at which the drop detaches from the substrate. The calculations have been carried out for axial-symmetric pillars of three different shapes: conical, hemispherical topped and flat topped cylindrical pillars. Calculations show that, assuming the same pillar spacing, conical pillars may be more incline to undergo an impalement transition to the Wenzel state, but, on the other hand, they are characterized by a vanishing pull-off pressure which causes the drop not to adhere to the substrate and therefore to detach very easily. We infer that this property should strongly reduce the contact angle hysteresis as experimentally osberved in Ref. \cite{Martines-Conical-Shape}. It is possible to combine large resistance to impalement transition (i.e. large value of p_{W}) and small (or even vanishing) detaching pressure p_{out} by employing cylindrical pillars with conical tips. We also show that depending on the particular pillar geometry, the effect of drop pressure on the apparent contact angle theta_{app} may be more or less significant. In particular we show that in case of conical pillars increasing the drop pressure causes a significant decrease of theta_{app} in agreement with some experimental investigations \cite{LafunaTransitio}, whereas theta_{app} slightly increases for hemispherical or flat topped cylindrical pillars.
Critical issues and challenges in the post-2012 perspective for the possible participation of the forestry sector market for carbon credits
Alisciani F,Carbone F,Perugini L
Forest@ , 2011, DOI: 10.3832/efor0672-008
Abstract: The first commitment period of the Kyoto Protocol (KP) is in its conclusive phase and with it the chances for forest farms in having an active role in the carbon market too. All carbon credits coming from Land Use, Land Use Change and Forestry activities will be used free of charge by the Italian Government in order to meet the national emission reduction target established under the Kyoto Protocol. In particular, the emitting sectors excluded from the European Union Emission Trading Scheme will benefit from forest carbon credits to offset part of their emissions, while for forest owners there is not any recognition for the provided service. In order to avoid the replication of this situation in the post-2012, it is necessary that the institution and the forest stakeholders, create the conditions for forest farms to participate and obtain the benefits introduced with the establishment of the Emission Trading, within the framework of post-2012 agreement. This condition could be achieved through the institution of a national carbon market. In this perspective this paper examines the main critical issues that could affect the participation of forest farms in the market.
The educational and awareness purposes of the Paideia approach for heritage management
F. Carbone,L. Oosterbeek,C. Costa
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2012, DOI: 10.5194/nhess-12-1983-2012
Abstract: The need to raise awareness among the communities about the challenge of resource use – and, more generally, about the principles of sustainability – is the reason why the United Nations General Assembly proclaimed, in December 2002, the United Nations Decade of Education for Sustainable Development, 2005–2014 (DESD). For operators and managers of cultural and natural heritage, it represents a profound challenge to their ability to transmit the content of scientific knowledge to the general public in order to empower everyone on the preservation of cultural and natural resources, and to raise awareness about the potential that mankind has at its disposal. In this context, the application of the PAIDEIA APPROACH for the management of cultural heritage is the key to the recovery of socio-economic values intrinsic to these resources. This approach to management is based on the enhancement of cultural (namely archaeological) and natural heritage for social benefit and it involves the tourist trade as a vehicle of knowledge transmission, intercultural dialogue and socio-economic sustainable development.
Resistive transition in disordered superconductors with varying intergrain coupling
L. Ponta,A. Carbone,M. Gilli
Physics , 2010, DOI: 10.1088/0953-2048/24/1/015006
Abstract: The effect of disorder is investigated in granular superconductive materials with strong and weak links. The transition is controlled by the interplay of the \emph{tunneling} $g$ and \emph{intragrain} $g_{intr}$ conductances, which depend on the strength of the intergrain coupling. For $g \ll g_{intr}$, the transition involves first the grain boundary, while for $g \sim g_{intr}$ the transition occurs into the whole grain. The different intergrain coupling is considered by modelling the superconducting material as a disordered network of Josephson junctions. Numerical simulations show that on increasing the disorder, the resistive transition occurs for lower temperatures and the curve broadens. These features are enhanced in disordered superconductors with strong links. The different behaviour is further checked by estimating the average network resistance for weak and strong links in the framework of the effective medium approximation theory. These results may be relevant to shed light on long standing puzzles as: (i) enhancement of the superconducting transition temperature of many metals in the granular states; (ii) suppression of superconductivity in homogeneously disordered films compared to standard granular systems close to the metal-insulator transition; (iii) enhanced degradation of superconductivity by doping and impurities in strongly linked materials, such as magnesium diboride, compared to weakly-linked superconductors, such as cuprates.
Chemical composition of PM10 and PM1 at the high-altitude Himalayan station Nepal Climate Observatory-Pyramid (NCO-P) (5079 m a.s.l.)
S. Decesari,M. C. Facchini,C. Carbone,L. Giulianelli
Atmospheric Chemistry and Physics Discussions , 2009,
Abstract: We report chemical composition data for PM10 and PM1 from the Nepal Climate Observatory-Pyramid (NCO-P), the world's highest aerosol observatory, located at 5079 m a.s.l. at the foothills of Mt. Everest. Despite its high altitude, the average PM10 mass apportioned by the chemical analyses is of the order of 6 μg m 3 (i.e., 10 μg/scm), with almost a half of this mass accounted for by organic matter, elemental carbon (EC) and inorganic ions, the rest being mineral dust. Organic matter, in particular, accounted for by 2.0 μg m 3 (i.e., 3.6 μg/scm) on a yearly basis, and it is by far the major PM10 component beside mineral oxides. Non-negligible concentrations of EC were also observed (0.36 μg/scm), confirming that optically-active aerosol produced from combustion sources can be efficiently transported up the altitudes of Himalayan glaciers. The concentrations of carbonaceous and ionic aerosols follow a common time trend with a maximum in the premonsoon season, a minimum during the monsoon and a slow "ramp-up" period in the postmonsoon and dry seasons, which is the same phenomenology observed for other Nepalese Himalayan sites in previous studies. Such seasonal cycle can be explained by the seasonal variations of dry and moist convection and of wet scavenging processes characterizing the climate of north Indian subcontinent. We document the effect of orographic transport of carbonaceous and sulphate particles upslope the Himalayas, showing that the valley breeze circulation, which is almost permanently active during the out-of-monsoon season, greatly impacts the chemical composition of PM10 and PM1 in the high Himalayas and provides an efficient mechanism for bringing anthropogenic optically-active aerosols into the Asian upper troposphere (>5000 m a.s.l.). The concentrations of mineral dust are impacted to a smaller extent by valley breezes and follow a unique seasonal cycle which suggest multiple source areas in central and south-west Asia. Our findings, based on two years of observations of the aerosol chemical composition, provide clear evidence that the southern side of the high Himalayas are impacted by transport of anthropogenic aerosols which constitute the Asian brown cloud.
Experimental and Numerical Characterization of CaPaMan 2bis Operation
E. E. Hernandez‐Martinez,L. Conghui,G. Carbone,M. Ceccarelli
Journal of applied research and technology , 2010,
Abstract: In this paper, the operation performance of CaPaMan 2bis (Cassino Parallel Manipulator 2 bis) was investigated through labexperimental tests and computer simulations. Milli‐CaTraSys (Milli‐Cassino Tracking System) was implemented to determinedisplacements and orientation variations of CaPaMan 2bis end‐effector during experimental tests. A 3D (three dimension)virtual model was built in ADAMS environment to simulate the operation behavior for different prescribed motions. Severalprescribed motions have been simulated and tested under different conditions in order to characterize the system behavior. Inparticular, the kinematic characteristics were obtained from both, experimental tests and numerical simulations. Finally,experiment results and simulation computations were compared for purpose of performance evaluation and designcharacterization of the parallel manipulator structure and its prototype.
Biomembrane models and drug-biomembrane interaction studies: Involvement in drug design and development
Pignatello R,Musumeci T,Basile L,Carbone C
Journal of Pharmacy and Bioallied Sciences , 2011,
Abstract: Contact with many different biological membranes goes along the destiny of a drug after its systemic administration. From the circulating macrophage cells to the vessel endothelium, to more complex absorption barriers, the interaction of a biomolecule with these membranes largely affects its rate and time of biodistribution in the body and at the target sites. Therefore, investigating the phenomena occurring on the cell membranes, as well as their different interaction with drugs in the physiological or pathological conditions, is important to exploit the molecular basis of many diseases and to identify new potential therapeutic strategies. Of course, the complexity of the structure and functions of biological and cell membranes, has pushed researchers toward the proposition and validation of simpler two- and three-dimensional membrane models, whose utility and drawbacks will be discussed. This review also describes the analytical methods used to look at the interactions among bioactive compounds with biological membrane models, with a particular accent on the calorimetric techniques. These studies can be considered as a powerful tool for medicinal chemistry and pharmaceutical technology, in the steps of designing new drugs and optimizing the activity and safety profile of compounds already used in the therapy.
Un Cluster ad alte prestazioni per il progetto AMS
P. Bobik,Matteo Boschini,L. Carbone,D. Grandi
Bollettino del CILEA , 2002, DOI: 10.1472/bc.v85inovembre.1133
Abstract: Viene presentato lo sviluppo di un cluster ad architettura PC Linux per calcolo ad alte prestazioni nell'ambito del progetto AMS.
Array of Josephson junctions with a non-sinusoidal current-phase relation as a model of the resistive transition of unconventional superconductors
A. Carbone,M. Gilli,P. Mazzetti,L. Ponta
Physics , 2009, DOI: 10.1063/1.3525984
Abstract: An array of resistively and capacitively shunted Josephson junctions with nonsinusoidal current-phase relation is considered for modelling the transition in high-T$_c$ superconductors. The emergence of higher harmonics, besides the simple sinusoid $I_{c}\sin\phi$, is expected for dominant \emph{d}-wave symmetry of the Cooper pairs, random distribution of potential drops, dirty grains, or nonstationary conditions. We show that additional cosine and sine terms act respectively by modulating the global resistance and by changing the Josephson coupling of the mixed superconductive-normal states. First, the approach is applied to simulate the transition in disordered granular superconductors with the weak-links characterized by nonsinusoidal current-phase relation. In granular superconductors, the emergence of higher-order harmonics affects the slope of the transition. Then, arrays of intrinsic Josephson junctions, naturally formed by the CuO$_2$ planes in cuprates, are considered. The critical temperature suppression, observed at values of hole doping close to $p=1/8$, is investigated. Such suppression, related to the sign change and modulation of the Josephson coupling across the array, is quantified in terms of the intensities of the first and second sinusoids of the current-phase relation. Applications are envisaged for the design and control of quantum devices based on stacks of intrinsic Josephson junctions.
On the turbulent energy cascade in anisotropic magnetohydrodynamic turbulence
V. Carbone,L. Sorriso-Valvo,R. Marino
Physics , 2010,
Abstract: The problem of the occurrence of an energy cascade for Alfv\'enic turbulence in solar wind plasmas was hystorically addressed by using phenomenological arguments based to the weakness of nonlinear interactions and the anisotropy of the cascade in wave vectors space. Here, this paradox is reviewed through the formal derivation of a Yaglom relation from anisotropic Magnetohydrodynamic equation. The Yaglom relation involves a third-order moment calculated from velocity and magnetic fields and involving both Els\"asser vector fields, and is particularly useful to be used as far as spacecraft observations of turbulence are concerned.
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