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Search Results: 1 - 10 of 207910 matches for " Daniela P. Ferro "
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Cohen-Macaulay graphs arising from digraphs
Giuseppa Carrá Ferro,Daniela Ferrarello
Mathematics , 2007,
Abstract: In this paper we show a correspondence between directed graphs and bipartite undirected graphs with a perfect matching, that allows to study properties of directed graphs through the properties of the corresponding undirected graphs. In particular it is shown that a directed graph is transitive iff a corresponding undirected graph is Cohen-Macaulay.
Polynomial ideals and directed graphs
Giuseppa Carrá Ferro,Daniela Ferrarello
Mathematics , 2007,
Abstract: In this paper it is shown that it is possible to associate several polynomial ideals to a directed graph $D$ in order to find properties of it. In fact by using algebraic tools it is possible to give appropriate procedures for automatic reasoning on cycles and directed cycles of graphs.
Fractal Characteristics of May-Grünwald-Giemsa Stained Chromatin Are Independent Prognostic Factors for Survival in Multiple Myeloma
Daniela P. Ferro,Monica A. Falconi,Randall L. Adam,Manoela M. Ortega,Carmen P. Lima,Carmino A. de Souza,Irene Lorand-Metze,Konradin Metze
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0020706
Abstract: The use of computerized image analysis for the study of nuclear texture features has provided important prognostic information for several neoplasias. Recently fractal characteristics of the chromatin structure in routinely stained smears have shown to be independent prognostic factors in acute leukemia. In the present study we investigated the influence of the fractal dimension (FD) of chromatin on survival of patients with multiple myeloma.
A última disciplina da administra o: um estudo didático e integrado de um modelo de planejamento estratégico
Carlos Alberto Gon?alves,Daniela Ferro Oliveira
Revista de Administra??o da UFSM , 2008,
Abstract: No ensino de Administra o, nos últimos períodos, geralmente existe em seus currículos de cursos a disciplina de Planejamento Estratégico e/ou de Política e Administra o Estratégica. No sentido amplo, é uma disciplina desafiadora e de grande responsabilidade por exigir análises sobre o enorme conjunto de conhecimentos sobre os ambientes e atores constitutivos da empresa analisada. No ambito das empresas, há a prática, por algumas corpora es, de se adotar as atividades de “fazer o Planejamento Estratégico” como forma de reflex o, direcionamento e melhoria de racionalidade na pragmática da Gest o Estratégica. Esse trabalho aborda, como ênfase, uma proposta de elaborar um formato ou esbo o de orienta o à elabora o de Planejamento Estratégico (PE). Para isso, busca consorciar um modelo (frame) como base, proposto por Hitt, Ireland e Hoskisson (2002), e realizar uma bricolagem de ferramentas de suporte descritas por vários autores e espalhadas pela literatura. Discute-se, ainda, a riqueza de representa o dos frames como forma disciplinadora da abstra o humana (MILLER, 1956). Busca-se, com isso, n o somente auxiliar no ensino da disciplina de PE, mas também oferecer aos executivos e consultores, na coordena o empresarial, elementos para a melhoria das atividades do “fazer o Planejamento Estratégico”.
A úLTIMA DISCIPLINA DA ADMINISTRA O: UM ESTUDO DIDáTICO E INTEGRADO DE UM MODELO DE PLANEJAMENTO ESTRATéGICO
Carlos Alberto Gon?alves,Daniela Ferro Oliveira
Revista PRETEXTO , 2005,
Abstract: No ensino de Administra o, nos últimos períodos, geralmente existe em seus currículos de cursos a disciplina de Planejamento Estratégico e/ou de Política e Administra o Estratégica. No sentido amplo, é uma disciplina desafiadora e de grande responsabilidade por exigir análises sobre o enorme conjunto de conhecimentos sobre os ambientes e atores constitutivos da empresa analisada. No ambito das empresas há a prática, por algumas corpora es, de se adotar as atividades de "fazer o Planejamento Estratégico" como forma de reflex o, direcionamento e melhoria de racionalidade na pragmática da Gest o Estratégica. Esse trabalho aborda, como ênfase, uma proposta de elaborar um formato ou esbo o de orienta o à elabora o de Planejamento Estratégico – PE. Para isso, busca consorciar um modelo (frame) como base, proposto por Hitt, Ireland e Hoskisson (2002), e realizar uma bricolagem de ferramentas de suporte descritas por vários autores e espalhadas pela literatura. Discute-se, ainda, a riqueza de representa o dos frames como forma disciplinadora da abstra o humana (MILLER, 1956). Busca-se com isso n o somente auxiliar no ensino da disciplina de PE, mas também oferecer aos executivos e consultores, na coordena o empresarial, elementos para a melhoria das atividades do "fazer o Planejamento Estratégico".
Pulsed Led’s Light at 650 nm Promote and at 470 nm Suppress Melatonin’s Secretion  [PDF]
F. Ferro Milone, A. Bolner, G. P. Nordera, S. Z. Scalinci
Neuroscience & Medicine (NM) , 2015, DOI: 10.4236/nm.2015.61006
Abstract:
In a previous research we have studied the effect of the stimulation of the retina, by pulsed LED’s light of different wavelength, on the spectral density of the alpha rhythms of the electroencephalogram [1] [2]. In conformity to our results and the recent discovery of a nonvisual pathway of light from the retina to the brain, we are induced to search for the effect of stimulation of the retina, with different wavelength, on the melatonin’s secretion. We have, therefore, stimulated the retina with blue LED’s light 470 nm and red LED’s light 650 nm, and measured the melatonin’s secretion in saliva by means of High Pressure Liquid Chromatography (HPLC). The results show that melatonin values are higher with long wavelength stimulation (red, 650 nm) to be confronted with short wavelength stimulation where the values are lower (blue, 470 nm), the difference being significant (***). Action spectrum of short wavelength, producing melatonin suppression, was already evidenced in vivo; it was also demonstrated that blue LED’s light differentially modulated cell’s survival and growth, inducing mitochondrial suppression in vitro. We speculate, therefore, that long wavelength light (red) produces photobiomodulation effect at the level of the retina and that this effect is the opposite of the effect produced by the short wavelength (blue). The molecular mechanism underlying both effects may be, we suppose, the activation (red) or depression (blue) of the mitochondrial cytochrome c oxidase activity at the level of the pool of the retina’s ganglion cells.
Atmospheric Abundances in Post-AGB candidates of Intermediate Temperature
A. Arellano Ferro,Sunetra Giridhar,P. Mathias
Physics , 2001, DOI: 10.1051/0004-6361:20000572
Abstract: Detailed atmospheric abundances have been calculated for a sample of A-G supergiant stars with IR fluxes and/or high galactic latitudes. HD 172481 and HD 158616 show clear indications of being post-AGB stars that have experienced third dredge-up. HD 158616 is carbon-rich while the abundance pattern of HD 172481 and its large Li enhancement gives support to the hot bottom burning scenario that explains paucity of carbon-rich stars among AGB stars. HD 172324 is very likely a hot post-AGB star that shows a strong carbon deficiency. HD 725, HD 218753 and HD 331319 also appear to be evolved objects between the red giant and the AGB. HD 9167, HD 173638 with a few exceptions, reflect solar abundances and no signs of post red giant evolution. They are most likely young massive disk supergiants. Further analysis of proto-Planetary Nebula HDE 341617 reveals that He lines show signs of velocity stratification. The emission lines have weakened considerably since 1993. The envelope expands at 19 km s$^{-1}$ relative to the star. Atmospheric abundances, evolutionary tracks and isochrones are used to estimate masses and ages of all stars in the sample.
Temperature dependence of modified CNO nuclear reaction rates in dense stellar plasmas
F. Ferro,A. Lavagno,P. Quarati
Physics , 2003, DOI: 10.1016/j.physa.2004.04.043
Abstract: We study the dependence of the CNO nuclear reaction rates on temperature, in the range of $10^7\div 10^8$ K, the typical range of temperature evolution from a Sun-like star towards a white dwarf. We show that the temperature dependence of the CNO nuclear reaction rates is strongly affected by the presence of non-extensive statistical effects in the dense stellar core. A very small deviation from the Maxwell-Boltzmann particle distribution implies a relevant enhancement of the CNO reaction rate and could explain the presence of heavier elements (e.g. Fe, Mg) in the final composition of a white dwarf core. Such a behavior is consistent with the recent experimental upper limit to the fraction of energy that the Sun produces via the CNO fusion cycle.
Non-extensive resonant reaction rates in astrophysical plasmas
F. Ferro,A. Lavagno,P. Quarati
Physics , 2003, DOI: 10.1140/epja/i2004-10006-0
Abstract: We study two different physical scenarios of thermonuclear reactions in stellar plasmas proceeding through a narrow resonance at low energy or through the low energy wing of a wide resonance at high energy. Correspondingly, we derive two approximate analytical formulae in order to calculate thermonuclear resonant reaction rates inside very coupled and non ideal astrophysical plasmas in which non-extensive effects are likely to arise. Our results are presented as simple first order corrective factors that generalize the well known classical rates obtained in the framework of Maxwell-Boltzmann statistical mechanics. As a possible application of our results, we calculate the dependence of the total corrective factor with respect to the energy at which the resonance is located, in an extremely dense and non ideal carbon plasma.
Nonextensive Interpretation Of Radiative Recombination In Electron Cooling
G. Maero,P. Quarati,F. Ferro
Physics , 2005, DOI: 10.1140/epjb/e2006-00101-6
Abstract: An interest for the low-energy range of the nonextensive distribution function arises from the study of radiative recombination in electron cooling devices in particle accelerators, whose experimentally measured reaction rates are much above the theoretical prediction. The use of generalized distributions, that differ from the Maxwellian in the low energy part (due to subdiffusion between electron and ion bunches), may account for the observed rate enhancement. In this work, we consider the isotropic distribution function and we propose a possible experiment for verifying the existence of a cut-off in the generalized momentum distribution, by measuring the spectrum of the X-rays emitted from radiative recombination reactions.
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