Searching Arxiv, refresh for possibly better results.

Results for "Antonello Sotgiu"

total 172took 0.21s
Spontaneous Radiofrequency Emission from Electron Spins within Drosophila: a preliminary report on a novel biological signalJul 10 2019Using simple radio frequency (RF) instrumentation, we detect spontaneous RF emission from Drosophila immersed in a magnetic field within a waveguide or a shielded RF resonator. Remarkably, the RF emissions are abolished by chloroform anesthesia, suggesting ... More
IntelliAV: Building an Effective On-Device Android Malware DetectorFeb 04 2018The importance of employing machine learning for malware detection has become explicit to the security community. Several anti-malware vendors have claimed and advertised the application of machine learning in their products in which the inference phase ... More
Water-filled telescopesJan 22 2014In this short note we discuss the case of the thought experiments on water-filled telescopes and their realizations during 18th and 19th century. The story of those instruments shows that the scientific progress occurs in a curious way, since there was ... More
Cultural Astronomy and Archaeoastronomy: an Italian ExperienceDec 09 2013A brief review is given of some recent positive developments regarding the reception of archaeoastronomy by the archaeological institutions in Italy. Discussions and problems that are currently going on in this field are also mentioned, such as the separation ... More
Hesiod's calendar and the star SpicaApr 08 2013Oct 23 2013In Hesiod's calendar, circa 8th century BCE, the harvest times of cereals were indicated by the heliacal rising of Pleiades (harvest) and by that of Orion (thresh). We tried to verify which risings and settings of the brightest stars could have been used ... More
Classical and quantum dynamics of a particle constrained on a circleJun 06 2001Jun 05 2002The Dirac method is used to analyze the classical and quantum dynamics of a particle constrained on a circle. The method of Lagrange multipliers is scrutinized, in particular in relation to the quantization procedure. Ordering problems are tackled and ... More
The myths of the BearMay 02 2013Following previous works on ancient myths in Greek and Latin literature regarding Ursa Major, and the possible relation with the ancient shape of the constellation, we discuss further this case in the light of the evolution of Homo sapiens and the ethnographic ... More
The dichotomy between 'practical' and 'theoretical' astronomy in ancient and late antique literatureJun 06 2016Aug 22 2016In Plato's dialogues Republic and Laws, the most important disciplines for the best education of the rulers of the city are identified with arithmetic, geometry and astronomy. Those disciplines, however, are not intended for practical applications, but ... More
On the Possibility of an Astronomical Perspective in the Study of Human EvolutionDec 05 2013The Sapient Paradox is the apparently unexplainable time delay of several ten thousand years following the arrival of Homo sapiens in Asia and Europe and before the introduction of impressive innovations with the agricultural revolution. Renfrew (2007) ... More
Bonaparte and the astronomers of Brera ObservatoryMay 27 2014In Northern Italy, between 1796 and 1814, Napoleon Bonaparte formed a Republic, and then a Kingdom, controlled by France. Milan was the capital of the State, and the Brera Palace was the main cultural centre, as regards both the arts and the sciences. ... More
The Optical Approach to Casimir EffectsAug 02 2004We propose a new approach to the Casimir effect based on classical ray optics. We define and compute the contribution of classical optical paths to the Casimir force between rigid bodies. Our approach improves upon the proximity force approximation. It ... More
Two examples of the relation between the contemporary science and PlatoSep 05 2016The philosopher Plato is remembered even today by scientists, and his writings are still inspiring the scientific research. In the present short note (intended essentially for public outreach) two examples are briefly illustrated: 1) the European space ... More
Atlantis, Carli and Bailly, and a short discussion about 'demonstration' in cultural astronomySep 28 2016Some European scholars in the second half of 18th century discussed the myth of Atlantis taking into account the studies of the evolution of the Earth and of the beginning and diffusion of civilization, in particular the beginning of astronomy. Atlantis ... More
Breaking the core-envelope symmetry in p-mode pulsating starsMay 13 2004It has been shown that there is a potential ambiguity in the asteroseismic determination of the location of internal structures in a pulsating star. We show how, in the case of high-order non-radial acoustic modes, it is possible to remove this ambiguity ... More
Random perfect lattices and the sphere packing problemFeb 25 2012Motivated by the search for best lattice sphere packings in Euclidean spaces of large dimensions we study randomly generated perfect lattices in moderately large dimensions (up to d=19 included). Perfect lattices are relevant in the solution of the problem ... More
Ergodicity breaking in a model showing many-body localizationJun 11 2012Feb 27 2013We study the breaking of ergodicity measured in terms of return probability in the evolution of a quantum state of a spin chain. In the non ergodic phase a quantum state evolves in a much smaller fraction of the Hilbert space than would be allowed by ... More
Extreme lattices: symmetries and decorrelationsSep 05 2013We study statistical and structural properties of extreme lattices, which are the local minima in the density landscape of lattice sphere packings, in $d$-dimensional Euclidean space $\mathbb{R}^d$. Specifically, we ascertain the distributions of densities, ... More
The forward approximation as a mean field approximation for the Anderson and Many Body Localization transitionsAug 20 2015Dec 07 2015In this paper we analyze the predictions of the forward approximation in some models which exhibit an Anderson (single-) or many-body localized phase. This approximation, which consists in summing over the amplitudes of only the shortest paths in the ... More
Toward a multilevel representation of protein molecules: comparative approaches to the aggregation/folding propensity problemJul 28 2014Apr 30 2015This paper builds upon the fundamental work of Niwa et al. [34], which provides the unique possibility to analyze the relative aggregation/folding propensity of the elements of the entire Escherichia coli (E. coli) proteome in a cell-free standardized ... More
Superlensing properties of one-dimensional dielectric photonic crystalsJul 22 2009We present the experimental observation of the superlensing effect in a slab of a one-dimensional photonic crystal made of tilted dielectric elements. We show that this flat lens can achieve subwavelength resolution in different frequency bands. We also ... More
Diffusive and subdiffusive spin transport in the ergodic phase of a many-body localizable systemApr 28 2016Jul 25 2016We study high temperature spin transport in a disordered Heisenberg chain in the ergodic regime. By employing a density matrix renormalization group technique for the study of the stationary states of the boundary-driven Lindblad equation we are able ... More
Classifying sequences by the optimized dissimilarity space embedding approach: a case study on the solubility analysis of the E. coli proteomeAug 17 2014Jan 14 2015We evaluate a version of the recently-proposed classification system named Optimized Dissimilarity Space Embedding (ODSE) that operates in the input space of sequences of generic objects. The ODSE system has been originally presented as a classification ... More
A biclustering approach to university performances: an Italian case studyApr 24 2014University evaluation is a topic of increasing concern in Italy as well as in other countries. In empirical analysis, university activities and performances are generally measured by means of indicator variables, summarizing the available information ... More
Variable stars in nearby galaxies. VI. Frequency-period distribution of Cepheids in IC 1613 and other galaxies of the Local GroupApr 11 2002The frequency--period distribution and other properties of Cepheids in IC 1613 are discussed and compared with those of stars in our Galaxy (Milky Way), LMC, SMC, M31 and M33. Taking into account the observational limitations and related incompleteness, ... More
A Hierarchical Genetic Optimization of a Fuzzy Logic System for Flow Control in Micro GridsApr 16 2016Computational Intelligence techniques are today widely used to solve complex engineering problems. Bio-inspired algorithms like Genetic Algorithms and Fuzzy Inference Systems are nowadays adopted as hybrids techniques in the commercial and industrial ... More
Multivariate Markov-Switching models and tail risk interdependenceDec 22 2013Mar 02 2014Markov switching models are often used to analyze financial returns because of their ability to capture frequently observed stylized facts. In this paper we consider a multivariate Student-t version of the model as a viable alternative to the usual multivariate ... More
On the structure of typical states of a disordered Richardson model and many-body localizationMar 17 2011Jun 10 2011We present a thorough numerical study of the Richardson model with quenched disorder (a fully-connected XX-model with longitudinal random fields). We study the onset of delocalization in typical states (many-body delocalization) and the delocalized phase ... More
The SAT-UNSAT transition in the adversarial SAT problemOct 03 2013Mar 07 2014Adversarial SAT (AdSAT) is a generalization of the satisfiability (SAT) problem in which two players try to make a boolean formula true (resp. false) by controlling their respective sets of variables. AdSAT belongs to a higher complexity class in the ... More
New bounds on millicharged particles from cosmologyMar 14 2007May 23 2007Particles with millicharge q and sub-eV mass can be produced in photon-photon collisions, distorting the energy spectrum of the Cosmic Microwave Background. We derive the conservative bound q < 10^-7 e (as well as model-dependent bounds two orders of ... More
Bipartite quantum systems: on the realignment criterion and beyondFeb 14 2008Aug 01 2008Inspired by the `computable cross norm' or `realignment' criterion, we propose a new point of view about the characterization of the states of bipartite quantum systems. We consider a Schmidt decomposition of a bipartite density operator. The corresponding ... More
Parity Doubling and SU(2)_L x SU(2)_R Restoration in the Hadron SpectrumNov 07 2005Jun 02 2006We construct the most general nonlinear representation of chiral SU(2)_L x SU(2)_R broken down spontaneously to the isospin SU(2), on a pair of hadrons of same spin and isospin and opposite parity. We show that any such representation is equivalent, through ... More
Bayesian Hidden Markov Modelling Using Circular-Linear General Projected Normal DistributionAug 20 2014Jan 24 2015We introduce a multivariate hidden Markov model to jointly cluster time-series observations with different support, i.e. circular and linear. Relying on the general projected normal distribution, our approach allows for bimodal and/or skewed cluster-specific ... More
A flexible bivariate location-scale finite mixture approach to economic growthOct 17 2014We introduce a multivariate multidimensional mixed-effects regression model in a finite mixture framework. We relax the usual unidimensionality assumption on the random effects multivariate distribution. Thus, we introduce a multidimensional multivariate ... More
V39: an unusual object in the field of IC 1613Apr 23 2002The variable star V39 in the field of IC 1613 is discussed in the light of the available photometric and new spectroscopic data. It has strong emission Balmer lines, and the observed characteristics could be explained by a W Vir pulsating star with a ... More
Computing the laser beam path in optical cavities: a geometric Newton's method based approachOct 14 2015Mar 14 2016In the last decade, increasing attention has been drawn to high precision optical experiments, which push resolution and accuracy of the measured quantities beyond their current limits. This challenge requires to place optical elements (e.g. mirrors, ... More
Modeling and Recognition of Smart Grid Faults by a Combined Approach of Dissimilarity Learning and One-Class ClassificationJul 25 2014Dec 17 2014Detecting faults in electrical power grids is of paramount importance, either from the electricity operator and consumer viewpoints. Modern electric power grids (smart grids) are equipped with smart sensors that allow to gather real-time information regarding ... More
Dixon's extended bodies and impulsive gravitational wavesOct 15 2009The "reaction" of an extended body to the passage of an exact plane gravitational wave is discussed following Dixon's model. The analysis performed shows several general features, e.g. even if initially absent, the body acquires a spin induced by the ... More
How many eigenvalues of a Gaussian random matrix are positive?Dec 06 2010We study the probability distribution of the index ${\mathcal N}_+$, i.e., the number of positive eigenvalues of an $N\times N$ Gaussian random matrix. We show analytically that, for large $N$ and large $\mathcal{N}_+$ with the fraction $0\le c=\mathcal{N}_+/N\le ... More
Modelling corporate defaults: A Markov-switching Poisson log-linear autoregressive modelApr 24 2018This article extends the autoregressive count time series model class by allowing for a model with regimes, that is, some of the parameters in the model depend on the state of an unobserved Markov chain. We develop a quasi-maximum likelihood estimator ... More
A novel algorithm for online inexact string matching and its FPGA implementationDec 10 2017Nov 26 2018Accelerating inexact string matching procedures is of utmost importance when dealing with practical applications where huge amount of data must be processed in real time, as usual in bioinformatics or cybersecurity. Inexact matching procedures can yield ... More
Quantitative estimates of the surface habitability of Kepler-452bJun 05 2017Kepler-452b is currently the best example of an Earth-size planet in the habitable zone of a sun-like star, a type of planet whose number of detections is expected to increase in the future. Searching for biosignatures in the supposedly thin atmospheres ... More
Brain-Computer Interface meets ROS: A robotic approach to mentally drive telepresence robotsDec 05 2017Apr 04 2019This paper shows and evaluates a novel approach to integrate a non-invasive Brain-Computer Interface (BCI) with the Robot Operating System (ROS) to mentally drive a telepresence robot. Controlling a mobile device by using human brain signals might improve ... More
Return probability for the Anderson model on the random regular graphMay 31 2018Nov 01 2018We show that comparing typical and mean values of the return probability one can differentiate between ergodic and multifractal dynamical phases in some random matrix model (power-law random banded matrices and Rosenzweig-Porter matrices), and in the ... More
Variable stars in nearby galaxies. II. Population I and II Cepheids in Field A of IC 1613Sep 09 1999The light curves of Cepheids and other variable stars in Field A of IC 1613, obtained with a CCD and no filter ($Wh$ photometry), have been analyzed. It is possible to separate first overtone from fundamental mode population I Cepheids taking into account ... More
Spatial dispersion effects upon local excitation of extrinsic plasmons in a graphene micro-diskJul 25 2015Sep 19 2015Excitation of surface plasmon waves in extrinsic graphene is studied using a full-wave electromagnetic field solver as analysis engine. Particular emphasis is placed on the role played by spatial dispersion due to the finite size of the two-dimensional ... More
X-ray emission from A0-F6 spectral type starsJun 13 1999We use the ROSAT public data archive to study the X-ray emission of a sample of supposedly single A0-F6 spectral type stars from the Bright Star Catalogue. We detected X-ray emission from 19 A and 33 F-type stars. However, our results are not sufficient ... More
Many-body localization dynamics from gauge invarianceJun 19 2017Dec 17 2017We show how lattice gauge theories can display many-body localization dynamics in the absence of disorder. Our starting point is the observation that, for some generic translationally invariant states, Gauss law effectively induces a dynamics which can ... More
Gravitational Wave Interaction with Normal and Superconducting CircuitsAug 28 1998The interaction, in the long--wavelength approximation, of normal and superconducting electromagnetic circuits with gravitational waves is investigated. We show that such interaction takes place by modifying the physical parameters R, L, C of the electromagnetic ... More
Fast and Robust Detection of Fallen People from a Mobile RobotMar 09 2017This paper deals with the problem of detecting fallen people lying on the floor by means of a mobile robot equipped with a 3D depth sensor. In the proposed algorithm, inspired by semantic segmentation techniques, the 3D scene is over-segmented into small ... More
On the quantum spin glass transition on the Bethe latticeJun 21 2016We investigate the ground-state properties of a disorderd Ising model with uniform transverse field on the Bethe lattice, focusing on the quantum phase transition from a paramagnetic to a glassy phase that is induced by reducing the intensity of the transverse ... More
Proximal Gradient Algorithms: Applications in Signal ProcessingMar 05 2018Mar 01 2019Advances in numerical optimization have supported breakthroughs in several areas of signal processing. This paper focuses on the recent enhanced variants of the proximal gradient numerical optimization algorithm, which combine quasi-Newton methods with ... More
On the Anderson transition on the Bethe latticeDec 09 2018May 23 2019We study the Anderson model on the Bethe lattice by working directly with real energies $E$. We show that the criterion for the stability of the populations leads to the same results as other, more traditional methods based on the imaginary part of the ... More
Dark Matter in the Standard Model?Mar 27 2018Sep 03 2018We critically reexamine two possible Dark Matter candidate within the Standard Model. First, we consider the $uuddss$ exa-quark. Its QCD binding energy could be large enough to make it (quasi) stable. We show that the cosmological Dark Matter abundance ... More
A comparison of remotely-sensed and inventory datasets for burned area in Mediterranean EuropeJun 14 2019Quantitative estimate of observational uncertainty is an essential ingredient to correctly interpret changes in climatic and environmental variables such as wildfires. In this work we compare four state-of-the-art satellite fire products with the gridded, ... More
Dixon's extended bodies and weak gravitational wavesOct 15 2009General relativity considers Dixon's theory as the standard theory to deal with the motion of extended bodies in a given gravitational background. We discuss here the features of the "reaction" of an extended body to the passage of a weak gravitational ... More
On the long-term correlations and multifractal properties of electric arc furnace time seriesMar 11 2015Jun 15 2015In this paper, we study long-term correlations and multifractal properties elaborated from time series of three-phase current signals coming from an industrial electric arc furnace plant. Implicit sinusoidal trends are suitably detected by considering ... More
Light scattering by radiation fields: the optical medium analogyAug 23 2014The optical medium analogy of a radiation field generated by either an exact gravitational plane wave or an exact electromagnetic wave in the framework of general relativity is developed. The equivalent medium of the associated background field is inhomogeneous ... More
Quadrupole effects on the motion of extended bodies in Kerr spacetimeOct 15 2009The motion of a body endowed with dipolar as well as quadrupolar structure is investigated in the Kerr background according to the Dixon's model, extending a previous analysis done in the Schwarzschild background. The full set of evolution equations is ... More
Quadrupole effects on the motion of extended bodies in Schwarzschild spacetimeOct 15 2009The motion of an extended body up to the quadrupolar structure is studied in the Schwarzschild background following Dixon's model and within certain restrictions (constant frame components for the spin and the quadrupole tensor, center of mass moving ... More
On the Anderson transition on the Bethe latticeDec 09 2018Apr 04 2019We study the Anderson model on the Bethe lattice by working directly with real energies $E$. We show that the criterion for the stability of the populations leads to the same results as other, more traditional methods based on the imaginary part of the ... More
On the impact of topological properties of smart grids in power losses optimization problemsJan 19 2015Jan 21 2015Power losses reduction is one of the main targets for any electrical energy distribution company. In this paper, we face the problem of joint optimization of both topology and network parameters in a real smart grid. We consider a portion of the Italian ... More
Lagrangian Dynamics in High-Dimensional Point-Vortex SystemsJun 09 1998We study the Lagrangian dynamics of systems of N point vortices and passive particles in a two-dimensional, doubly periodic domain. The probability distribution function of vortex velocity, p_N, has a slow-velocity Gaussian component and a significant ... More
Distribution of partition function zeros of the $\pm J$ model on the Bethe latticeJan 27 2010Jun 15 2010The distribution of partition function zeros is studied for the $\pm J$ model of spin glasses on the Bethe lattice. We find a relation between the distribution of complex cavity fields and the density of zeros, which enables us to obtain the density of ... More
Signatures of many-body localisation in the dynamics of two-sites entanglementAug 31 2016Jan 09 2017We are able to detect clear signatures of dephasing -- a distinct trait of Many-Body Localisation (MBL) -- via the dynamics of two-sites entanglement, quantified through the concurrence. Using the protocol implemented in [Science {\bf 349}, 842 (2015)] ... More
Energy transport in a disordered spin chain with broken U(1) symmetry: Diffusion, subdiffusion, and many-body localizationMay 02 2018Nov 05 2018We explore the physics of the disordered XYZ spin chain using two complementary numerical techniques: exact diagonalization (ED) on chains of up to 17 spins, and time-evolving block decimation (TEBD) on chains of up to 400 spins. Our principal findings ... More
On initial direction, orientation and discreteness in the analysis of circular variablesSep 29 2015In this paper, we propose a discrete circular distribution obtained by extending the wrapped Poisson distribution. This new distribution, the Invariant Wrapped Poisson (IWP), enjoys numerous advantages: simple tractable density, parameter-parsimony and ... More
Emergent geometries and nonlinear-wave dynamics in photon fluidsDec 04 2015Nonlinear waves in defocusing media are investigated in the framework of the hydrodynamic description of light as a photon fluid. The observations are interpreted in terms of an emergent curved spacetime generated by the waves themselves, which fully ... More
Variable stars in nearby galaxies. V. Search for Cepheids in Field A of NGC 6822Apr 02 2002The results of a CCD survey for variability of stars in the nearby galaxy NGC 6822 are presented. The goal of the survey was to obtain good light curves of Cepheids for Fourier decomposition and to detect shorter period Cepheids. Since the program was ... More
Variable stars in nearby galaxies. I. Search for Cepheids in Field A of IC 1613Jun 29 1999The first results are presented of a four-year program dedicated to the CCD observations of Cepheids in the nearby galaxy IC 1613. Since the program was carried out with a relatively small telescope, the Dutch 0.9 m at ESO-La Silla, the observations were ... More
Multifractal Characterization of Protein Contact NetworksOct 03 2014Oct 09 2014The multifractal detrended fluctuation analysis of time series is able to reveal the presence of long-range correlations and, at the same time, to characterize the self-similarity of the series. The rich information derivable from the characteristic exponents ... More
Proximal Gradient Algorithms: Applications in Signal ProcessingMar 05 2018May 08 2018Advances in numerical optimization have supported breakthroughs in several areas of signal processing. This paper focuses on the recent enhanced variants of the proximal gradient numerical optimization algorithm, which combine quasi-Newton methods with ... More
Signatures of many-body localisation in the dynamics of two-sites entanglementAug 31 2016Sep 12 2016We are able to detect clear signatures of dephasing -- a distinct trait of Many-Body Localisation (MBL) -- via the dynamics of two-sites entanglement, quantified through the concurrence. Using the protocol implemented in [Science {\bf 349}, 842 (2015)] ... More
Identifying user habits through data mining on call data recordsNov 22 2017In this paper we propose a framework for identifying patterns and regularities in the pseudo-anonymized Call Data Records (CDR) pertaining a generic subscriber of a mobile operator. We face the challenging task of automatically deriving meaningful information ... More
The Index Distribution of Gaussian Random MatricesOct 05 2009We compute analytically, for large N, the probability distribution of the number of positive eigenvalues (the index N_{+}) of a random NxN matrix belonging to Gaussian orthogonal (\beta=1), unitary (\beta=2) or symplectic (\beta=4) ensembles. The distribution ... More
Search for low instability strip variables in the young open cluster NGC 2516May 20 1998In this paper we revise and complete the photometric survey of the instability strip of the southern open cluster NGC 2516 published by Antonello and Mantegazza (1986). No variable stars with amplitudes larger than $0^m.02$ were found. However by means ... More
Entanglement critical length at the many-body localization transitionOct 28 2016Oct 30 2017We study the details of the distribution of the entanglement spectrum (eigenvalues of the reduced density matrix) of a disordered spin chain exhibiting a many-body localization (MBL) transition. In the thermalizing region we identify the evolution under ... More
Dynamics of a small neutrally buoyant sphere in a fluid and targeting in Hamiltonian systemsJul 22 2000We show that, even in the most favorable case, the motion of a small spherical tracer suspended in a fluid of the same density may differ from the corresponding motion of an ideal passive particle. We demonstrate furthermore how its dynamics may be applied ... More
Particle dynamics and deviation effects in the field of a strong electromagnetic waveAug 23 2014Some strong field effects on test particle motion associated with the propagation of a plane electromagnetic wave in the exact theory of general relativity are investigated. Two different profiles of the associated radiation flux are considered in comparison, ... More
Probable nonradial g-mode pulsation in early A-type starsNov 16 2005A survey for line profile variability in early A-type stars has been performed in order to detect nonradial pulsation signatures. The star HR 6139, with spectral type A2V and estimated T_eff=8800 K, shows evident line profile variations that can be explained ... More
A generative model for protein contact networksMar 08 2015In this paper we present a generative model for protein contact networks. The soundness of the proposed model is investigated by focusing primarily on mesoscopic properties elaborated from the spectra of the graph Laplacian. To complement the analysis, ... More
Entanglement critical length at the many-body localization transitionOct 28 2016We study the details of the distribution of the entanglement spectrum (eigenvalues of the reduced density matrix) of a disordered spin chain exhibiting a many-body localization (MBL) transition. In the thermalizing region we identify the evolution under ... More
Entanglement critical length at the many-body localization transitionOct 28 2016Nov 18 2016We study the details of the distribution of the entanglement spectrum (eigenvalues of the reduced density matrix) of a disordered spin chain exhibiting a many-body localization (MBL) transition. In the thermalizing region we identify the evolution under ... More
Phase diagram of bipartite entanglementJun 04 2019We investigate the features of the entanglement spectrum (distribution of the eigenvalues of the reduced density matrix) of a large quantum system in a pure state. We consider all R\'enyi entropies and recover purity and von Neumann entropy as particular ... More
A novel mechanical analogy based battery model for SoC estimation using a multi-cell EKFJan 14 2016The future evolution of technological systems dedicated to improve energy efficiency will strongly depend on effective and reliable Energy Storage Systems, as key components for Smart Grids, microgrids and electric mobility. Besides possible improvements ... More
Tests of Quantum Gravity induced non-locality via opto-mechanical quantum oscillatorsDec 07 2015Apr 26 2016Several quantum gravity scenarios lead to physics below the Planck scale characterised by nonlocal, Lorentz invariant equations of motion. We show that such non-local effective field theories lead to a modified Schr\"odinger evolution in the nonrelativistic ... More
An Agent-Based Algorithm exploiting Multiple Local Dissimilarities for Clusters Mining and Knowledge DiscoverySep 17 2014We propose a multi-agent algorithm able to automatically discover relevant regularities in a given dataset, determining at the same time the set of configurations of the adopted parametric dissimilarity measure yielding compact and separated clusters. ... More
Analysis of heat kernel highlights the strongly modular and heat-preserving structure of proteinsSep 05 2014Mar 16 2015In this paper, we study the structure and dynamical properties of protein contact networks with respect to other biological networks, together with simulated archetypal models acting as probes. We consider both classical topological descriptors, such ... More
Tuning efficiency and sensitivity of guided resonances in photonic crystals and quasi-crystals: A comparative studyJun 18 2010Jul 28 2010In this paper, we present a comparative study of the tuning efficiency and sensitivity of guided resonances (GRs) in photonic crystal (PC) holed slabs based on periodic and aperiodically-ordered unit cells, aimed at assessing the applicability of these ... More
Astronomical orientations in sanctuaries of DauniaJul 08 2013Prehistoric sanctuaries of Daunia date back several thousand years. During the Neolithic and Bronze Age the farmers in that region dug hypogea and holes whose characteristics suggest a ritual use. In the present note we summarize the results of the astronomical ... More
A Dirty Holographic SuperconductorAug 08 2013Jun 20 2014We study the effects of disorder on a holographic superconductor by introducing a random chemical potential on the boundary. We consider various realizations of disorder and find that the critical temperature for superconductivity is enhanced. We also ... More
Data-driven detrending of nonstationary fractal time series with echo state networksOct 24 2015In this paper, we propose a data-driven approach to the problem of detrending fractal and multifractal time series. We consider a time series as the measurements elaborated from a dynamical process over time. We assume that such a dynamical process is ... More
Asymmetry in energy versus spin transport in certain interacting, disordered systemsMar 30 2018We study energy transport in XXZ spin chains driven to nonequilibrium configurations by thermal reservoirs of different temperatures at the boundaries. We discuss the transition between diffusive and subdiffusive transport regimes in sectors of zero and ... More
Experimental evidence of cut-wire-induced enhanced transmission of transverse-electric fields through sub-wavelength slits in a thin metallic screenAug 26 2010Oct 28 2010Recent numerical studies have demonstrated the possibility of achieving substantial enhancements in the transmission of transverse-electric-polarized electromagnetic fields through subwavelength slits in a thin metallic screen by placing single or paired ... More
The habitable zone of Earth-like planets with different levels of atmospheric pressureFeb 19 2013As a contribution to the study of the habitability of extrasolar planets, we implemented a 1-D Energy Balance Model (EBM), the simplest seasonal model of planetary climate, with new prescriptions for most physical quantities. Here we apply our EBM to ... More
Magnetoquasistatic Resonances of Small Dielectric ObjectsJul 05 2019A small dielectric object with positive permittivity may resonate when the free-space wavelength is large in comparison with the object dimensions if the permittivity is sufficiently high. We show that these resonances are all magnetoquasistatic in nature ... More
The Holographic Disorder-Driven Supeconductor-Metal TransitionJul 08 2015We implement the effects of disorder on a holographic superconductor by introducing a random chemical potential on the boundary. We demonstrate explicitly that increasing disorder leads to the formation of islands where the superconducting order is enhanced ... More
Effect of speckle on APSCI method and Mueller ImagingJan 09 2014The principle of the polarimetric imaging method called APSCI (Adapted Polarization State Contrast Imaging) is to maximize the polarimetric contrast between an object and its background using specific polarization states of illumination and detection. ... More
Volume Integral Formulation for the Calculation of Material Independent Modes of Dielectric ScatterersMar 29 2017Oct 14 2017In the frame of volume integral equation methods, we introduce an alternative representation of the electromagnetic field scattered by a homogeneous object of arbitrary shape at a given frequency, in terms of a set of modes independent of its permittivity. ... More
Compensation of the laser parameters fluctuations in large ring laser gyros: a Kalman filter approachAug 07 2012Sep 11 2012He-Ne ring laser gyroscopes are, at present, the most precise devices for absolute angular velocity measurements. Limitations to their performance come from the non--linear dynamics of the laser. Following the Lamb semi-classical theory, we find a set ... More
Support set of random wave-functions on the Bethe latticeDec 30 2013We introduce a new measure of ergodicity, the support set $S_\varepsilon$, for random wave functions on disordered lattices. It is more sensitive than the traditional inverse participation ratios and their moments in the cases where the extended state ... More