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Search Results: 1 - 10 of 461910 matches for " A. Candela "
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On the dimension of additive sets
P. Candela,H. A. Helfgott
Mathematics , 2014,
Abstract: We study the relations between several notions of dimension for an additive set, some of which are well-known and some of which are more recent, appearing for instance in work of Schoen and Shkredov. We obtain bounds for the ratios between these dimensions by improving an inequality of Lev and Yuster, and we show that these bounds are asymptotically sharp, using in particular the existence of large dissociated subsets of $\{0,1\}^n\subset \mathbb{Z}^n$.
Perturbed asymptotically linear problems
R. Bartolo,A. M. Candela,A. Salvatore
Mathematics , 2012,
Abstract: The aim of this paper is investigating the existence of solutions of some semilinear elliptic problems on open bounded domains when the nonlinearity is subcritical and asymptotically linear at infinity and there is a perturbation term which is just continuous. Also in the case when the problem has not a variational structure, suitable procedures and estimates allow us to prove that the number of distinct crtitical levels of the functional associated to the unperturbed problem is "stable" under small perturbations, obtaining multiplicity results if the nonlinearity is odd, both in the non--resonant and in the resonant case.
Soporte nutricional en el paciente oncológico
C. Gómez Candela,A. Sastre Gallego
Nutrición Hospitalaria , 2003,
Multiple solutions for p-Laplacian type problems with asymptotically p-linear terms via a cohomological index theory
A. M. Candela,G. Palmieri,K. Perera
Mathematics , 2013,
Abstract: The aim of this paper is investigating the existence of weak solutions of the quasilinear elliptic model problem \[ \left\{\begin{array}{lr} - \divg (A(x,u)\, |\nabla u|^{p-2}\, \nabla u) + \dfrac1p\, A_t(x,u)\, |\nabla u|^p\ =\ f(x,u) & \hbox{in $\Omega$,}\\ u\ = \ 0 & \hbox{on $\partial\Omega$,} \end{array} \right. \] where $\Omega \subset \R^N$ is a bounded domain, $N\ge 2$, $p > 1$, $A$ is a given function which admits partial derivative $A_t(x,t) = \frac{\partial A}{\partial t}(x,t)$ and $f$ is asymptotically $p$-linear at infinity. Under suitable hypotheses both at the origin and at infinity, and if $A(x,\cdot)$ is even while $f(x,\cdot)$ is odd, by using variational tools, a cohomological index theory and a related pseudo--index argument, we prove a multiplicity result if $p > N$ in the non--resonant case.
The Application of K Phosphites to Seed Tubers Enhanced Emergence, Early Growth and Mycorrhizal Colonization in Potato (Solanum tuberosum)  [PDF]
Cecilia Tambascio, Fernanda Covacevich, María Candela Lobato, Carolina de Lasa, Daniel Caldiz, Guillermo Dosio, Adriana Andreu
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.51017

Rapid emergence and a vigorous growth prevent the seed tubers from infections by soil microbes and allow a rapid interception of solar radiation. In this work, the effect of the potassium phosphites (KPhi) applied to seed tubers of two potato cultivars on crop emergence and early growth was studied. Two experiments were performed under greenhouse and field conditions. Emergence of plants, leaf area, dry matter and the number of primary stems were measured in both experiments. Furthermore, mycorrhizal colonization was also measured on roots under field conditions. The application of KPhi reduced the period between planting and emergence, and increased leaf area and dry matter. The ratio between dry matter of aerials and underground organs was not affected by KPhi. Indigenous mycorrhizal colonization increased after KPhi application to seed tubers. These results confirm the benefit of the application of KPhi to seed tubers on early plant growth and suggest that their application in crop production would be advantageous.

First Characterization of Escherichia coli Strains Isolated from Wildlife Griffon Vulture (Gyps fulvus) in the Southeast of Spain  [PDF]
Azucena Mora, Nieves Ortega, Elena Garcia, Susana Viso, Mónica G. Candela, Ghizlane Dahbi, Francisco Cuello, María Rosa Caro
Open Journal of Veterinary Medicine (OJVM) , 2014, DOI: 10.4236/ojvm.2014.412040
Abstract: The aim of the present study was to characterize a collection of Escherichia coli strains isolated from asymptomatic griffon vulture (Gyps fulvus) during a reintroduction program in the southeast of Spain, in order to establish if griffon vulture could play a role in the spread of resistant or potentially pathogenic E. coli strains. For this purpose, 14 E. coli strains obtained from 10 griffon vulture were studied to establish their serotypes, phylogroups, virulencegene profiles and antimicrobial resistances. High heterogeneity was observed within the 14 strains isolated which belonged to three phylogroups (A, B1 and D), 8 serogroups (O2, O21, O29, O60, 073, O78, O103 and O141) and 13 different serotypes. Out of 34 genes screened, we have detected eight virulence genes that are typical of extraintestinal pathogenic E. coli (ExPEC) (fimH, fimAvMT78, iroN, iucD, cvaC, iss, traT and tsh); however, none of the studied strains showed the ExPEC status. The 14 strains were also analyzed for the production of extended-spectrum beta-lactamases (ESBLs) and for antimicrobial resistances. None of the 14 strains were ESBL-producing E. coli, but high resistance-prevalences to ampicillin and cotrimoxazole were detected. To our knowledge, this is the first characterization of E. coli strains isolated from griffon vulture and although they did not show high virulencegene scores, they showed cotrimoxazole resistance.
Desafíos de los emprendimientos educativos en las fábricas recuperadas
Fernández,Ana María; Calloway,Cecilia; Cabrera,Candela;
Anuario de investigaciones , 2009,
Abstract: this paper belongs to the ubacyt investigation p019 "autogestión, estado y producción de subjetividad: experiencias de fábricas y empresas recuperadas en argentina". it is an investigation of a descriptive-exploratory nature following a qualitative methodology to obtain and analyze information. the theoretical frame has a multireferential criterion that articulates ideas from social sciences, social psychology, theories of discursive productions and community psychology. some characteristics of educational enterprises that work inside of three of the recovered factories of the city of buenos aires are presented. it is about self-managed collectives composed by teaching staff, students and workers, that form high schools for young and adults based in popular education. in them prevails a self-managing, horizontal logic, in contrast with the characteristics of traditional education institutions. their functioning goes by assembly.
Estructura de la corriente de Yucatán en los canales de Cozumel y Yucatán
Athié, G;Candela, J;Sheinbaum, J;Badanf, A;Ochoa, J;
Ciencias marinas , 2011,
Abstract: a comparison based on eight months of simultaneous observations of the flow variability in the yucatan and cozumel channels shows that the portion of the yucatan current that crosses through cozumel channel is best correlated with the flow near the center of the yucatan channel within the core of the yucatan current (defined here as velocities in excess of 0.6 m s-1). the core has a mean transport of 9 sv, which is about 40% of that measured for the entire yucatan channel cross section. the position of maximum current velocity oscillates within the mean core position in the yucatan channel, shifting eastward when the current intensifies in cozumel channel and westward when it weakens, indicative of a current behavior dominated by inertia instead of topographic control. mesoscale features, possibly eddies passing through the region, seem to couple the variability in both channels, giving a plausible explanation for the observed current patterns.
Providing Learning Computing Labs using Hosting and Virtualization Technologies
Armide González,Carmelo Rubén García,Santiago Candela
International Journal of Emerging Technologies in Learning (iJET) , 2011, DOI: 10.3991/ijet.v6is2.1651
Abstract: This paper presents a computing hosting system to provide virtual computing laboratories for learning activities. This system is based on hosting and virtualization technologies. All the components used in its development are free software tools. The computing lab model provided by the system is a more sustainable and scalable alternative than the traditional academic computing lab, and it requires lower costs of installation and operation.
Tidal currents in the Yucatan Channel
F. Carrillo González,J. Ochoa,J. Candela,A. Badan
Geofísica internacional , 2007,
Abstract: Currents data from a ten-month period at 197 measuring points covering all Yucatan Channel were processed by harmonic analysis to estimate tidal parameters for the O1, K1, M2 and S2 components. The highly detailed coverage confirms the known dominance for the O1 and K1 diurnal components, but also showed, for the first time, their intensification in the deep eastern margin of the channel where maximum amplitudes in main axis are 17 and 19 cm.s-1. The data also confirms weak semi-diurnal components, of which the most intense, M2 and S2, have amplitudes only up to 2 cm.s-1. The tidal ellipses were elongated (i.e. with eccentricities close to one) in the NNW direction. The O1, K1, M2 and S2 contributions in transport variability through the channel have amplitudes of 11.7, 12.5, 1.2 and 1.0 Sv, all well determined above noise.
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