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Search Results: 1 - 10 of 278665 matches for " I. N.;Soares "
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Reflection of equatorial Kelvin waves at eastern ocean boundaries Part II: Pacific and Atlantic Oceans
J. Soares,I. Wainer,N. C. Wells
Annales Geophysicae (ANGEO) , 2003,
Abstract: The effect of viscosity, non linearities, incident wave period and realistic eastern coastline geometry on energy fluxes are investigated using a shallow water model with a spatial resolution of 1/4 degree in both meridional and zonal directions. Equatorial and mid-latitude responses are considered. It is found that (1) the influence of the coastline geometry and the incident wave period is more important for the westward energy flux than for the poleward flux, and (2) the effect of the inclination of the eastern ocean boundary on the poleward energy flux, for the Pacific and Atlantic Oceans, decline as the period of the incident wave increases. Furthermore, the model simulations suggest that the poleward energy fluxes from meridional boundaries give plausible results for motions of seasonal and annual periods. For comparatively shorter periods, a realistic coastline geometry has to be included for more accurate results. It is recommended that any numerical model involving the reflection of baroclinic Rossby waves (of intraseasonal, seasonal or annual periods) on the eastern Pacific or Atlantic Oceans, should consider the effect of the coastline geometry in order to improve the accuracy of the results. Key words. Oceanography: general (climate and interannual variability; equatorial oceanography). Oceanography: physical (eastern boundary currents).
Reflection of equatorial Kelvin waves at eastern ocean boundaries Part I: hypothetical boundaries
J. Soares,I. Wainer,N. C. Wells
Annales Geophysicae (ANGEO) , 2003,
Abstract: A baroclinic shallow-water model is developed to investigate the effect of the orientation of the eastern ocean boundary on the behavior of equatorial Kelvin waves. The model is formulated in a spherical polar coordinate system and includes dissipation and non-linear terms, effects which have not been previously included in analytical approaches to the problem. Both equatorial and middle latitude response are considered given the large latitudinal extent used in the model. Baroclinic equatorial Kelvin waves of intraseasonal, seasonal and annual periods are introduced into the domain as pulses of finite width. Their subsequent reflection, transmission and dissipation are investigated. It is found that dissipation is very important for the transmission of wave energy along the boundary and for reflections from the boundary. The dissipation was found to be dependent not only on the presence of the coastal Kelvin waves in the domain, but also on the period of these coastal waves. In particular the dissipation increases with wave period. It is also shown that the equatorial β-plane approximation can allow an anomalous generation of Rossby waves at higher latitudes. Nonlinearities generally have a small effect on the solutions, within the confines of this model. Key words. Oceanography: general (equatorial oceanography; numerical modeling) · Oceanography: physical (eastern boundary currents)
Recobrimento da liga Ti-6Al-4V com hidroxiapatita pelo método sol-gel e sua aplica??o a hastes femorais n?o-cimentadas
Avés, E. P.;Galván, J. C.;Lima, I. R.;Granjeiro, J. M.;Bastos, I. N.;Soares, G. D.;
Ceramica , 2008, DOI: 10.1590/S0366-69132008000400015
Abstract: the coating of metallic alloys with bioactive ceramics aims to accelerate bone formation around the implant, contributing to its fixation. in this paper, the deposition of hydroxyapatite ceramic on ti-6al-4v alloy sheets by the sol-gel method was studied. the coating layer was characterized by scanning electron microscopy, x-ray diffraction and its adhesion to substrate was evaluated by shear testing. the citocompatibility test shows that the sol-gel coating did not provoke the cell death significantly higher than the control (p > 0.05). moreover, femoral stems removed from patient (explants) were adequately coated using the sol-gel process.
Fun??o de resposta da melancia aos níveis de água e aduba??o nitrogenada, no Vale do Curu, CE
Soares, José I.;Costa, Raimundo N. T.;Silva, Luiz A. C. da;Gondim, Rubens S.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2002, DOI: 10.1590/S1415-43662002000200006
Abstract: the objective of this research was to study the effect of different levels of irrigation and nitrogen fertilization applied to watermelon crop and to establish a production function aimed at economic optimization of the yield based on the costs of water and fertilizer. the experimental design consisted of randomized blocks with split plots combining five irrigation water levels (312.1, 288.5, 252.6, 205.2 and 142.5 mm) and four levels of fertilization (0, 75, 150 and 300 kg ha-1) with four replications. the watermelon cultivar crimson sweet was used and the irrigations were monitored by tensiometers installed at 0.15 m of depth. the irrigation was applied when the soil matric potential reached -30 kpa. the maximum productivity of 64,908.9 kg ha-1 was obtained by the treatment that received 227.3 mm of water and 229.8 kg ha-1 of nitrogen. the substitution of water for nitrogen was found to be not advantageous from the economic point of view. the optimum economic water use was estimated to be 27.2 kg m-3 or 272 kg ha-1 mm-1, corresponding to 242.7 kg ha-1 of nitrogen.
Vince – a case study
A. Carvalho, I. Soares, M. Belo Pereira, M. Vargas, N. Moreira,P. Pinto
Advances in Science and Research (ASR) , 2008, DOI: 10.5194/asr-2-145-2008
Abstract: Vince was an unusual hurricane that developed over the North Atlantic Ocean in an unexpected area, on October 2005. In this work, the authors analyze its background and genesis over the ocean, making use of satellite imagery and numerical models. The impacts on sea state are investigated both numerically and observationally. Landfall over the Iberian Peninsula is monitored with surface observations and a radar system at Algarve (Portugal).
Potentialities of some surface characterization techniques for the development of titanium biomedical alloys
Vanzillotta P.S.,Soares G. A.,Bastos I. N.,Sim?o R. A.
Materials Research , 2004,
Abstract: Bone formation around a metallic implant is a complex process that involves micro- and nanometric interactions. Several surface treatments, including coatings were developed in order to obtain faster osseointegration. To understand the role of these surface treatments on bone formation it is necessary to choose adequate characterization techniques. Among them, we have selected electron microscopy, profilometry, atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) to describe them briefly. Examples of the potentialities of these techniques on the characterization of titanium for biomedical applications were also presented and discussed. Unfortunately more than one technique is usually necessary to describe conveniently the topography (scanning electron microsocopy, profilometry and/or AFM) and the chemical state (XPS) of the external layer of the material surface. The employment of the techniques above described can be useful especially for the development of new materials or products.
Light-induced structural transformations in a single gallium nanoparticulate
B. F. Soares,K. F. MacDonald,V. A. Fedotov,N. I. Zheludev
Physics , 2005, DOI: 10.1021/nl0515652
Abstract: In a single gallium nanoparticulate, self-assembled (from an atomic beam) in a nano-aperture at the tip of a tapered optical fiber, we have observed evidence for a sequence of reversible light-induced transformations between five different structural phases (gamma - epsilon - delta - beta - liquid), stimulated by optical excitation at nanowatt power levels.
Potentialities of some surface characterization techniques for the development of titanium biomedical alloys
Vanzillotta, P.S.;Soares, G. A.;Bastos, I. N.;Sim?o, R. A.;Kuromoto, N. K.;
Materials Research , 2004, DOI: 10.1590/S1516-14392004000300011
Abstract: bone formation around a metallic implant is a complex process that involves micro- and nanometric interactions. several surface treatments, including coatings were developed in order to obtain faster osseointegration. to understand the role of these surface treatments on bone formation it is necessary to choose adequate characterization techniques. among them, we have selected electron microscopy, profilometry, atomic force microscopy (afm) and x-ray photoelectron spectroscopy (xps) to describe them briefly. examples of the potentialities of these techniques on the characterization of titanium for biomedical applications were also presented and discussed. unfortunately more than one technique is usually necessary to describe conveniently the topography (scanning electron microsocopy, profilometry and/or afm) and the chemical state (xps) of the external layer of the material surface. the employment of the techniques above described can be useful especially for the development of new materials or products.
Finite size analysis of a two-dimensional Ising model within a nonextensive approach
N. Crokidakis,D. O. Soares-Pinto,M. S. Reis,A. M. Souza,R. S. Sarthour,I. S. Oliveira
Physics , 2009, DOI: 10.1103/PhysRevE.80.051101
Abstract: In this work we present a thorough analysis of the phase transitions that occur in a ferromagnetic 2D Ising model, with only nearest-neighbors interactions, in the framework of the Tsallis nonextensive statistics. We performed Monte Carlo simulations on square lattices with linear sizes L ranging from 32 up to 512. The statistical weight of the Metropolis algorithm was changed according to the nonextensive statistics. Discontinuities in the m(T) curve are observed for $q\leq 0.5$. However, we have verified only one peak on the energy histograms at the critical temperatures, indicating the occurrence of continuous phase transitions. For the $0.5
Structural Analysis of the C-Terminal Region (Modules 18–20) of Complement Regulator Factor H (FH)
Hugh P. Morgan, Haydyn D. T. Mertens, Mara Guariento, Christoph Q. Schmidt, Dinesh C. Soares, Dmitri I. Svergun, Andrew P. Herbert, Paul N. Barlow, Jonathan P. Hannan
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0032187
Abstract: Factor H (FH) is a soluble regulator of the human complement system affording protection to host tissues. It selectively inhibits amplification of C3b, the activation-specific fragment of the abundant complement component C3, in fluid phase and on self-surfaces and accelerates the decay of the alternative pathway C3 convertase, C3bBb. We have determined the crystal structure of the three carboxyl-terminal complement control protein (CCP) modules of FH (FH18–20) that bind to C3b, and which additionally recognize polyanionic markers specific to self-surfaces. These CCPs harbour nearly 30 disease-linked missense mutations. We have also deployed small-angle X-ray scattering (SAXS) to investigate FH18–20 flexibility in solution using FH18–20 and FH19–20 constructs. In the crystal lattice FH18–20 adopts a “J”-shape: A ~122-degree tilt between the structurally highly similar modules 18 and 19 precedes an extended, linear arrangement of modules 19 and 20 as observed in previously determined structures of these two modules alone. However, under solution conditions FH18–20 adopts multiple conformations mediated by flexibility between CCPs 18 and 19. We also pinpoint the locations of disease-associated missense mutations on the module 18 surface and discuss our data in the context of the C3b:FH interaction.
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