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71.
Intonti F Riboli F Caselli N Abbarchi M Vignolini S Wiersma DS Vinattieri A Gerace D Balet L Li LH Francardi M Gerardino A Fiore A Gurioli M 《Physical review letters》2011,106(14):143901
A revisited realization of the Young's double slit experiment is introduced to directly probe the photonic mode symmetry by photoluminescence experiments. We experimentally measure the far field angular emission pattern of quantum dots embedded in photonic molecules. The experimental data well agree with predictions from Young's interference and numerical simulations. Moreover, the vectorial nature of photonic eigenmodes results in a rather complicated parity property for different polarizations, a feature which has no counterpart in quantum mechanics. 相似文献
72.
Stefano Cipolla Carmine Di Fiore Fabio Durastante Paolo Zellini 《Numerical Linear Algebra with Applications》2019,26(2)
In this work, given a positive definite matrix A, we introduce a class of matrices related to A, which is obtained by suitably combining projections of its powers onto algebras of matrices simultaneously diagonalized by a unitary transform. After a detailed theoretical study of some spectral properties of the matrices of this class, which suggests their use as regularizing preconditioners, we prove that such matrices can be cheaply computed when the matrix A has a Toeplitz structure. We provide numerical evidence of the advantages coming from the employment of the proposed preconditioners when used in regularizing procedures. 相似文献
73.
G. D'Erasmo L. Fiore A. Pantaleo I. Iori Li Zu Yu A. Moroni F. Gramegna M. Pavanati G. Prete R. A. Ricci G. Viesti 《Zeitschrift für Physik A Hadrons and Nuclei》1985,321(3):425-428
The element distributions for the reactions32S+100Mo,32S+93Nb, and28Si+93Nb have been measured atE/B~1.4. The correlations between the first moment of the measured distributions and TKEL are consistent with the predictions of the liquid drop potential energy surfaces showing the charge equilibration of the dinuclear systems. The measured second moments are compared with a recent systematics. 相似文献
74.
Summary We have analysed observations of the three Seyfert Galaxies IC4329A, MCG-6-30-15 and NGC 4051 extracted from the GINGA archive.
The variations in the (4⋎18) keV spectrum of the three sources can be interpreted in the framework of a model with two components:
a ?direct? power law with constant spectral index (α=1.9⋎2.1), and the ?reflection bump? predicted by Guilbert and Rees, and
Lightman and White which is produced by reprocessing of the direct power law in optically thick matter in the surroundings
of the central source. The differences found in the behaviour of the three sources would arise, in this scenario, from the
different size of the ?reprocessing region?.
Paper presented at the V Cosmic Physics National Conference, S. Miniato, November 27–30, 1990. 相似文献
75.
Summary Two procedures aimed at a synthetic, quantitative characterization of the integrative activity in a small system of nerve
cells are proposed, and applications to the buccal ganglion of the molluskAplysia are described. Both methods are based on cross-correlation evaluation. The first method processes intracellular signals simultaneously
recorded from pairs of neurones, and reveals and measures the occurrence of shared synaptic input. The second method processes
extracellular multiunit signals recorded by two cuff electrodes placed around one nerve, and evaluates the impulse traffic,
subdivided according to direction and speed of propagation. The outcome of both methods may be used to represent the state
of the system, and may provide a basis to further studies on its dynamics.
Paper presented at the International Workshop ?Fluctuations in Physics and Biology: Stochastic Resonance, Signal Processing
and Related Phenomena?, Elba, 5–10 June 1994. 相似文献
76.
Fiore CE 《The Journal of chemical physics》2011,135(11):114107
Parallel tempering Monte Carlo simulations have been applied to a variety of systems presenting rugged free-energy landscapes. Despite this, its efficiency depends strongly on the temperature set. With this query in mind, we present a comparative study among different temperature selection schemes in three lattice-gas models. We focus our attention in the constant entropy method (CEM), proposed by Sabo et al. In the CEM, the temperature is chosen by the fixed difference of entropy between adjacent replicas. We consider a method to determine the entropy which avoids numerical integrations of the specific heat and other thermodynamic quantities. Different analyses for first- and second-order phase transitions have been undertaken, revealing that the CEM may be an useful criterion for selecting the temperatures in the parallel tempering. 相似文献
77.
78.
G.C. Lavorato G. Fiore A. Castellero M. Baricco J.A. Moya 《Physica B: Condensed Matter》2012,407(16):3192-3195
Amorphous alloys with composition (at%) Fe48Cr15Mo14C15B6Gd2 (alloy A) and Fe48Cr15Mo14C15B6Y2 (alloy B) were prepared either using pure elements (A and B1) and a commercial AISI430 steel as a base material (B2). When prepared from pure elements both alloys (A and B1) could be cast in plate form with a fixed thickness of 2 mm and variable lengths between 10 and 20 mm by means of copper-mold injection in air atmosphere. In the case of alloy B2, prepared using commercial grade raw materials, rods of 2 mm diameter were obtained. 相似文献
79.
Roberto Cirilli Stefano Alcaro Rossella Fioravanti Daniela Secci Stefano Fiore Francesco La Torre Francesco Ortuso 《Journal of chromatography. A》2009,1216(22):4673-4678
The cellulose tris(4-methylbenzoate) chiral stationary phase (CSP) (commercially known as Chiralcel OJ-H) exhibited an extremely high enantioselectivity when used in the HPLC resolution of N-thiocarbamoyl-3-(4′-prenyloxy)-phenyl-5-phenyl-4,5-dihydro-(1H) pyrazole (Compound 1), in both normal-phase and polar organic conditions. Using n-hexane–ethanol (80:20, v/v) as a mobile phase, an enantioseparation factor value of 138.5 was found. In order to modulate the elution time of the longer retained enantiomer, a simple HPLC procedure was developed. The optimized analytical protocol was based on the stopped flow technique and did not involve any change in mobile phase composition. The stronger interaction energy of the (S) enantiomer compared to that of the (R) enantiomer was mainly attributed to the formation of a hydrogen bonding between the amino group of the thiocarbamoyl moiety and the carbonyl oxygen of the CSP. 相似文献
80.