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Search Results: 1 - 10 of 298457 matches for " J. Martino "
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A Sieve for Prime Based on Extension Form of Not Prime  [PDF]
Gabriele Martino
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.31014

This paper will illustrate two versions of an algorithm for finding prime number up to N, which give the first version complexity

\"\" (1)

where c1, c2 are constants, and N is the input dimension, and gives a better result for the second version. The method is based on an equation that expresses the behavior of not prime numbers. With this equation it is possible to construct a fast iteration to verify if the not prime number is generated by a prime and with which parameters. The second method differs because it does not pass other times over a number that has been previously evaluated as not prime. This is possible for a recurrence of not prime number that is (mod 3) = 0. The complexity in this case is better than the first. The comparison is made most with Mathematics than by computer calculation as the number N should be very big to appreciate the difference between the two versions. Anyway the second version results better. The algorithms have been

Primality Test  [PDF]
Gabriele Martino
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.31009

In this paper we will give an algorithm that in the worst case solve the question about the primality of a number in \"\" but that gives better result if the number is not prime (constant operation). Firstly, we will introduce an equation on which are based not prime numbers. With this equation it is possible to deduce the prime number that generates a not prime number and to establish an equation in which if exists a certain integer the number is not prime and therefore vice versa to deduce if it is prime.

Solving a Traveling Salesman Problem with a Flower Structure  [PDF]
Gabriele Martino
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.27079

This works aims to give an answer to the problem P = NP? The result is positive with the criteria that solve the Traveling Salesman Problem in polynomial cost of the input size and a proof is given. This problem gets a solution because a polyhedron, with a cut flower looking, is introduced instead of graph (e.g. tree).

NICS-TNG infrared spectroscopy of trans-neptunian objects 2000 EB173 and 2000 WR106
J. Licandro,E. Oliva,M. Di MArtino
Physics , 2001, DOI: 10.1051/0004-6361:20010758
Abstract: We report complete near-infrared (0.9-2.4 $\mu$m) spectral observations of trans-neptunian objects (TNOs) 2000 EB173 and 2000 WR106 collected using the new Near Infrared Camera Spectrometer (NICS) attached to the 3.56m Telescopio Nazionale Galileo (TNG). Both spectra are very red and with a quite strong and broad drop extending throughout the K band. However, while 2000 EB173 does not show any evidence of narrow absorption features, the spectrum of 2000 WR106 has quite deep water ice absorption at 1.5 and 2.0 $\mu$m. Moreover, the latter object is significantly less red than the former indicating, therefore, that the surface of 2000 WR106 is ``cleaner'' (i.e. less processed by particle irradiation) than that of 2000 EB173.
Broken ergodicity and memory in the minority game
J. A. F. Heimel,A. De Martino
Quantitative Finance , 2001, DOI: 10.1088/0305-4470/34/40/103
Abstract: We study the dynamics of the `batch' minority game with market-impact correction using generating functional techniques to carry out the quenched disorder average. We find that the assumption of weak long-term memory, which one usually makes in order to calculate ergodic stationary states, breaks down when the persistent autocorrelation becomes larger than c_c=0.772... We show that this condition, remarkably, coincides with the AT-line found in an earlier static calculation. This result suggests a new scenario for ergodicity breaking in disordered systems.
The Interventions of Pietro da Cortona in the Crypt of Santa Maria in Via Lata in Rome, Studied through a Morphometric Three-Dimensional Survey  [PDF]
Lorenzo Pio Massimo Martino
Open Journal of Civil Engineering (OJCE) , 2014, DOI: 10.4236/ojce.2014.42009

Twenty years after the last archaeological researches and surveys, a new investigation has been carried out on the basement in the church of Santa Maria in Via Lata in Rome. The study has employed three-dimensional surveys with laser scanning methodology and has focused both on archaeological and architectural issues. Indeed, the present layout of the basement derives from a XVII century remodelling of early Christian and medieval spaces planned by Pietro da Cortona. The architect gave a unique setting and composition to the underground spaces, different in shapes and building materials, thanks to the refinement of his baroque language. Though he worked in small spaces with static problems connected to the foundations and to the loads of the church rising above, and with poor lighting and extreme dampness, Pietro da Cortona put skilfully together “modern” elements with ancient or historical pre-existences. The study focuses on Berrettini’s design process through a three-dimensional analysis with CAD systems, starting from the new XVII century fa?ade and from the articulated distribution of routes that led to the intimate underground interiors. Metrical processing gave the possibility to improve the knowledge about room geometry and to confirm the interpretations put forward by major scholars such as Krautheimer and Cavazzi.

Petrografía, estructura y significado tectónico de la Faja de Deformación Los Túneles en las Sierras de Pocho y Guasapampa, Córdoba Petrography, structure and tectonic significance of 'Los Túneles' Shear Zone, Sierras de Pocho y Guasapampa, Córdoba, Argentina
R. D. Martino,A. B. Guereschi,J. A. Sfragulla
Revista de la Asociación Geológica Argentina , 2003,
Abstract: La Faja de Deformación Los Túneles (FDLT) se dispone norte-sur, con 75 kilómetros de largo y 1-5 kilómetros de ancho. Limita al oeste con la falla de Pocho y la zona de falla La Mermela, al este con las rocas del Macizo San Carlos y el gneis Las Palmas, al sur con la faja de deformación Pachango y hacia el norte se extiende paralelamente a las Sierras de Pocho y Guasapampa. Las rocas van desde milonitas al norte, pasando por protomilonitas y luego estromatitas poco deformadas al sur. Concomitantemente con la deformación, habrían ingresado fluidos ricos en H+, en un sistema abierto, los que habrían producido sillimanita y luego abundante muscovita a partir de plagioclasa y biotita. Las condiciones físicas de deformación varían desde la facies de anfibolitas superiores hasta la facies de esquistos verdes. La foliación reconocida es compuesta y está integrada por una foliación predominante C, orientada N 334°/42°E, la que es cortada por bandas de cizalla extensional de bajo ángulo C'. Sobre el plano C hay una lineación de estiramiento de Ms ± Sil ± Qtz, orientada N 50°/43° y con 80°N de cabeceo. La FDLT se interpreta como una faja de deformación dúctil, con movimiento inverso del techo hacia N 230°, que superpone rocas en zona de Sil + Kfs sobre rocas en zona de Sil + Ms. Se reconocen dos inversiones metamórficas de distintas edades y producidas en distintos regímenes de deformación. La FDLT es posmetamórfica con respecto a las metamorfitas regionales y preplutónica con respecto al plutón de Charquina. El período de actividad tectónica oscila entre el Cámbrico superior y el Ordovícico inferior (509-474 Ma), y coincidiría con el acercamiento del terrane Cuyania al margen gondwánico y con las etapas contraccionales póstumas de la colisión del terrane Pampia con el margen occidental de Gondwana. The 'Los Túneles' Shear Zone (LTSZ) is a 75 km long by 1-5 km wide north-south trending belt. It is bordered to the west by the Pocho Fault and the La Mermela Fault Zone, and to the east by the San Carlos Massif rocks and Las Palmas gneiss. The southern border is the Pachango Shear Zone and it extends northward parallel to the Sierras de Pocho y Guasapampa. Mylonites in the north, protomylonites in the centre and little-deformed stromatites in the south are recognized along the LTSZ. H+-rich fluids would have infiltrated during the deformation producing sillimanite and abundant muscovite from plagioclase and biotite. The P-T conditions of deformation were transitional between upper amphibolite to greenschist facies. The observed foliation is composite and consists of a
Identificación intraoperatoria del área motora suplementaria en cirugía neurooncológica Intraoperative identification of the supplementary motor area in neurooncological surgery
A. Gabarrós,J. Martino,M. Juncadella,G. Plans
Neurocirugía , 2011,
Abstract: Objetivos. El objetivo principal del estudio es conseguir la identificación intraoperatoria de la función del área motora suplementaria (AMS) implicada en tareas motoras complejas. El objetivo secundario es valorar el pronóstico funcional tras la preservación quirúrgica de este área. Método. Se han seleccionado 15 pacientes con tumores cerebrales localizados en área premotora. Todos los pacientes fueron intervenidos despiertos. El córtex motor primario fue identificado mediante estimulación cerebral directa. Para identificar el AMS, el paciente realizó una tarea motora de oposición de dedos con la mano contralateral a la lesión que se bloqueaba mediante la estimulación eléctrica del córtex cerebral premotor. Resultados. El AMS pudo ser identificada en todos los pacientes mediante este método. La resección fue macroscópicamente completa en 13 pacientes (86.6%) y subtotal en 2 (13.3%). La función encontrada en el AMS se ha podido preservar en 14 pacientes (93,3%). Sólo en una paciente se resecó parcialmente el AMS funcional junto a la lesión por infiltración de la misma (6.6%). En el postoperatorio inmediato 8 pacientes (53.3%) presentaron empeoramiento de los déficits, cinco pacientes (33.3%) no mostraron cambios respecto a su exploración preoperatoria y 2 pacientes mejoraron. A los 6 meses de la intervención 5 pacientes (33.3%) se encuentran asintomáticos y 10 pacientes presentan déficits permanentes. En este último grupo, 5 pacientes (33.3%) muestran un déficit muy leve que no interfiere en su vida normal. En los otros 5 pacientes (33.3%) los déficits permanentes interfieren con la vida del paciente: dos pacientes presentan hemiparesia severa 3/5 (igual estado preoperatorio que no mejora), uno afasia de expresión y otros dos (13.3%) presentan un síndrome del AMS izquierda permanente. En los 2 pacientes con hemiparesia severa postoperatoria se objetivó intraoperatoriamente una infiltración tumoral del córtex motor primario y de la vía motora; el déficit motor severo preoperatorio (KPS<70) se asoció con mal pronóstico funcional postoperatorio. Conclusiones. La estimulación cortical intraoperatoria resulta útil para la identificación del AMS. La preservación del AMS, una vez identificada, disminuye la aparición de síntomas postquirúrgicos y la persistencia del síndrome del AMS. Cuando el AMS se encuentra infiltrada por tumor, su resección quirúrgica puede causar déficits permanentes, especialmente en el hemisferio dominante. El déficit motor severo preoperatorio se asocia con mal pronóstico funcional. Objectives. The main objective of the present work was
Profile characterization of diffraction gratings using angle-resolved polarimetric measurements
Foldyna M.,De Martino A.,Licitra C.,Foucher J.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100502003
Abstract: Development of the characterization tools and techniques used by semi-conductor industry directs not only towards increasing of the instrumental precision, to push limits of the optical characterization methods to the smallest lines, but also towards a decreased dependency of the used tools on the tool-to-tool calibration procedures. The challenge approached in this work is to use multiple independent optical configurations to determine overall accuracy of the results with minimal or no assistance of the other non-optical methods. The approach presented here is based on a well-known change of sensitivity of the optical model parameters at the different azimuthal measurement configurations. The full potential of this method can only be unlocked using complete Mueller matrix measurements providing complete information on the anisotropic nature of the gratings. The measurements at multiple azimuth configurations, used in this work, illustrate the potential of the method on the experimental data provided by the angle-resolved and spectrally resolved Mueller matrix polarimetric tools. The results are consistent with the single-line AFM measurements used as an independent reference.
Dynamic facilitation picture of a higher-order glass singularity
Mauro Sellitto,Daniele De Martino,Fabio Caccioli,Jeferson J. Arenzon
Physics , 2010, DOI: 10.1103/PhysRevLett.105.265704
Abstract: We show that facilitated spin mixtures with a tunable facilitation reproduce, on a Bethe lattice, the simplest higher-order singularity scenario predicted by the mode-coupling theory (MCT) of liquid-glass transition. Depending on the facilitation strength, they yield either a hybrid glass transition or a continuous one, with no underlying thermodynamic singularity. Similar results are obtained for facilitated spin models on a diluted Bethe lattice. The mechanism of dynamical arrest in these systems can be interpreted in terms of bootstrap and standard percolation and corresponds to a crossover from a compact to a fractal structure of the incipient spanning cluster of frozen spins. Theoretical and numerical simulation results are fully consistent with MCT predictions.
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