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Search Results: 1 - 10 of 308719 matches for " F; D′Onofrio "
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Exact Casimir interaction between eccentric cylinders
D. A. R. Dalvit,F. C. Lombardo,F. D. Mazzitelli,R. Onofrio
Physics , 2006, DOI: 10.1103/PhysRevA.74.020101
Abstract: The Casimir force is the ultimate background in ongoing searches of extra-gravitational forces in the micrometer range. Eccentric cylinders offer favorable experimental conditions for such measurements as spurious gravitational and electrostatic effects can be minimized. Here we report on the evaluation of the exact Casimir interaction between perfectly conducting eccentric cylinders using a mode summation technique, and study different limiting cases of relevance for Casimir force measurements, with potential implications for the understanding of mechanical properties of nanotubes.
Síntesis y caracterización de Fe40Ni40Ag20 y (FeNi)80Ag20 mecánicamente aleados
BONYUET,D; GONZáLEZ,G; OCHOA,J; GONZáLEZ-JIMéNEZ,F; DONOFRIO,L;
Revista de la Facultad de Ingeniería Universidad Central de Venezuela , 2006,
Abstract: mechanical alloying (ma) is a process that has shown to be a versatile tool to produce nanostructured composites and alloys from normally immiscible elements. it has the advantage that the parameters of the process can be varied in order to control the grade of the alloy and the microstructure characteristics. in this form, it is possible to produce magnetic materials with new properties. the phase diagrams of ni-ag and fe ag show that mutual solubility is very low in the liquid state as in the solid state. however, it has been able to obtain partial solid solutions in these systems by mechanical alloying and other techniques. because the ball milling process is a non equilibrium technique, it is possible to force the mixture of immiscible elements. in this work we present a study of the ternary system fe-ag-ni, preparing by mechanical alloying fe40ni40ag20 and (feni)80ag20 in a spex 8000 mixer/mill. then we characterized the samples by x-ray diffraction (xrd), transmission electron microscopy (tem) and m?ssbauer spectroscopy. the nanometric size grain is confirmed by xrd. m?ssbauer spectroscopy indicates the grade of alloying after different milling times.
STUDY OF THE Fe-75%Ag SYSTEM OBTAINED BY MECHANICAL ALLOYING
Bonyuet,D; González,G; Ochoa,J; Gonzalez-Jimenez,F; DOnofrio,L;
Revista Latinoamericana de Metalurgia y Materiales , 2002,
Abstract: mechanical alloying (ma) is a powder processing technique, which allows us to induce solid state reactions in binary systems immiscible in equilibrium. fe and ag have a mutually repulsive nature that makes them completely immiscible under thermodynamically stable conditions. the ball milling process being a non-equilibrium technique seems promising in obtaining at least a partial solid solution in this system. mixtures of fe and ag powders with 75 wt% ag were studied by x-ray diffraction (xrd), scanning electron microscopy (sem) and transmission electron microscopy (tem). we have found that it is possible to obtain a small mutual solid solution in this system by ma. this is also confirmed by m?ssbauer spectroscopy.
Contribution of Radiocarbon Dating to the Chronology of Eneolithic in Campania (Italy)
I. Passariello, P. Talamo, A. D'Onofrio, P. Barta, C. Lubritto, F. Terrasi
Geochronometria , 2010, DOI: 10.2478/v10003-010-0008-2
Abstract: The paper presents new and important 14C data from eight Eneolithic sites in Campania measured at the Centre for Isotopic Research of Cultural and Environmental Heritage (CIRCE) AMS laboratory in Caserta (Italy). Twenty-four 14C determinations on bone and charcoal are used here for chronological reconstruction of human habitation and dating of some volcanic eruptions affecting the settlement activity. Our research has shed new light on absolute chronology of the whole Campanian Eneolithic, a period of profound cultural transformations triggered by introduction and use of metals, in particular copper.
Present Limits on the Precision of SM Predictions for Jet Energies
A. A. Paramonov,F. Canelli,M. D'Onofrio,H. J. Frisch,S. Mrenna
Physics , 2010, DOI: 10.1016/j.nima.2010.07.039
Abstract: We investigate the impact of theoretical uncertainties on the accuracy of measurements involving hadronic jets. The analysis is performed using events with a Z boson and a single jet observed in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV in 4.6 $\mathrm{fb^{-1}}$ of data from the Collider Detector at Fermilab (CDF). The transverse momenta (\pt) of the jet and the boson should balance each other due to momentum conservation in the plane transverse to the direction of the $p$ and $\bar{p}$ beams. We evaluate the dependence of the measured \pt-balance on theoretical uncertainties associated with initial and final state radiation, choice of renormalization and factorization scales, parton distribution functions, jet-parton matching, calculations of matrix elements, and parton showering. We find that the uncertainty caused by parton showering at large angles is the largest amongst the listed uncertainties. The proposed method can be re-applied at the LHC experiments to investigate and evaluate the uncertainties on the predicted jet energies. The distributions produced at the CDF environment are intended for comparison to those from modern event generators and new tunes of parton showering.
Concep o retórica e concep o semantica da metáfora
Salvatore D'Onofrio
Alfa : Revista de Linguística , 2001,
Abstract: O Autor realiza um estudo sobre as duas principais teorias surgidas para o entendimento da estrutura e do funcionamento do processo metafórico: a teoria retórica, que considera a metáfora apenas como uma figura de estilo, e a teoria semantica, que vê na metáfora o princípio onipresente e indispensável para a renova o da linguagem humana e para a cria o do texto poético.
Os motivos da sátira romana
Salvatore D'Onofrio
Alfa : Revista de Linguística , 2001,
Abstract:
SUSY Searches with Jets at CDF
M. D'Onofrio
Physics , 2008,
Abstract: We present the most recent results on searches for squarks and gluinos in ppbar collisions at sqrt(s)=1.96 TeV, in events with large missing transverse energy, leptons and multiple jets in the final state, based on 1.8 to 2.8 fb-1 of data collected by the CDF Run II detector at the Tevatron. No evidence of new physics is found and exclusion limits in several MSSM scenarios are extracted.
Beauty production cross section measurements at Ecm=1.96 TeV
Monica D'Onofrio
Physics , 2005,
Abstract: The RunII physics program at the Tevatron started in spring 2001 with protons and antiprotons colliding at an energy of $\sqrt{s}$=1.96 TeV, and it is carrying on with more than 500 pb-1 of data as collected by both the CDF and D0 experiments. Recent results on beauty production cross section measurements are here reported.
Fractal growth of tumors and other cellular populations: Linking the mechanistic to the phenomenological modeling and vice versa
Alberto d'Onofrio
Quantitative Biology , 2013, DOI: 10.1016/j.chaos.2008.04.014
Abstract: In this paper we study and extend the mechanistic mean field theory of growth of cellular populations proposed by Mombach et al in (Mombach J. C. M. et al., Europhysics Letter, 59 (2002) 923) (MLBI model), and we demonstrate that the original model and our generalizations lead to inferences of biological interest. In the first part of this paper, we show that the model in study is widely general since it admits, as particular cases, the main phenomenological models of cellular growth. In the second part of this work, we generalize the \emph{MLBI} model to a wider family of models by allowing the cells to have a generic unspecified biologically plausible interaction. Then, we derive a relationship between this generic microscopic interaction function and the growth rate of the corresponding macroscopic model. Finally, we propose to use this relationship in order to help the investigation of the biological plausibility of phenomenological models of cancer growth.
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