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Search Results: 1 - 10 of 190178 matches for " Moncho Gómez-Gesteira "
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GPUs, a New Tool of Acceleration in CFD: Efficiency and Reliability on Smoothed Particle Hydrodynamics Methods
Alejandro C. Crespo,Jose M. Dominguez,Anxo Barreiro,Moncho Gómez-Gesteira,Benedict D. Rogers
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0020685
Abstract: Smoothed Particle Hydrodynamics (SPH) is a numerical method commonly used in Computational Fluid Dynamics (CFD) to simulate complex free-surface flows. Simulations with this mesh-free particle method far exceed the capacity of a single processor. In this paper, as part of a dual-functioning code for either central processing units (CPUs) or Graphics Processor Units (GPUs), a parallelisation using GPUs is presented. The GPU parallelisation technique uses the Compute Unified Device Architecture (CUDA) of nVidia devices. Simulations with more than one million particles on a single GPU card exhibit speedups of up to two orders of magnitude over using a single-core CPU. It is demonstrated that the code achieves different speedups with different CUDA-enabled GPUs. The numerical behaviour of the SPH code is validated with a standard benchmark test case of dam break flow impacting on an obstacle where good agreement with the experimental results is observed. Both the achieved speed-ups and the quantitative agreement with experiments suggest that CUDA-based GPU programming can be used in SPH methods with efficiency and reliability.
Variability of Coastal and Ocean Water Temperature in the Upper 700 m along the Western Iberian Peninsula from 1975 to 2006
Fran Santos, Moncho Gómez-Gesteira, Maite deCastro, Inés álvarez
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0050666
Abstract: Temperature is observed to have different trends at coastal and ocean locations along the western Iberian Peninsula from 1975 to 2006, which corresponds to the last warming period in the area under study. The analysis was carried out by means of the Simple Ocean Data Assimilation (SODA). Reanalysis data are available at monthly scale with a horizontal resolution of 0.5°×0.5° and a vertical resolution of 40 levels, which allows obtaining information beneath the sea surface. Only the first 21 vertical levels (from 5.0 m to 729.35 m) were considered here, since the most important changes in heat content observed for the world ocean during the last decades, correspond to the upper 700 m. Warming was observed to be considerably higher at ocean locations than at coastal ones. Ocean warming ranged from values on the order of 0.3°C dec?1 near surface to less than 0.1°C dec?1 at 500 m, while coastal warming showed values close to 0.2°C dec?1 near surface, decreasing rapidly below 0.1°C dec?1 for depths on the order of 50 m. The heat content anomaly for the upper 700 m, showed a sharp increase from coast (0.46 Wm?2) to ocean (1.59 Wm?2). The difference between coastal and ocean values was related to the presence of coastal upwelling, which partially inhibits the warming from surface of near shore water.
Mixed Layer Depth Trends in the Bay of Biscay over the Period 1975–2010
Xurxo Costoya, Maite deCastro, Moncho Gómez-Gesteira, Fran Santos
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0099321
Abstract: Wintertime trends in mixed layer depth (MLD) were calculated in the Bay of Biscay over the period 1975–2010 using the Simple Ocean Data Assimilation (SODA) package. The reliability of the SODA database was confirmed correlating its results with those obtained from the experimental Argo database over the period 2003–2010. An iso-thermal layer depth (TLD) and an iso-pycnal layer depth (PLD) were defined using the threshold difference method with ΔT = 0.5°C and Δσθ = 0.125 kg/m3. Wintertime trends of the MLD were calculated using winter extended (December-March) anomalies and annual maxima. Trends calculated for the whole Bay of Biscay using both parameters (TLD and PLD) showed to be dependent on the area. Thus, MLD became deeper in the southeastern corner and shallower in the rest of the area. Air temperature was shown to play a key role in regulating the different spatial behavior of the MLD. Negative air temperature trends localized in the southeastern corner coincide with MLD deepening in this area, while, positive air temperature trends are associated to MLD shoaling in the rest of the bay. Additionally, the temperature trend calculated along the first 700 m of the water column is in good agreement with the different spatial behavior revealed for the MLD trend.
Optimization strategies for parallel CPU and GPU implementations of a meshfree particle method
Jose M. Domínguez,Alejandro J. C. Crespo,Moncho Gómez-Gesteira
Computer Science , 2011,
Abstract: Much of the current focus in high performance computing (HPC) for computational fluid dynamics (CFD) deals with grid based methods. However, parallel implementations for new meshfree particle methods such as Smoothed Particle Hydrodynamics (SPH) are less studied. In this work, we present optimizations for both central processing unit (CPU) and graphics processing unit (GPU) of a SPH method. These optimization strategies can be further applied to many other meshfree methods. The obtained performance for each architecture and a comparison between the most efficient implementations for CPU and GPU are shown.
Combined Effects of the North Atlantic Oscillation and the Arctic Oscillation on Sea Surface Temperature in the Alborán Sea
José C. Báez, Luis Gimeno, Moncho Gómez-Gesteira, Francisco Ferri-Yá?ez, Raimundo Real
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0062201
Abstract: We explored the possible effects of the North Atlantic Oscillation (NAO) and Arctic Oscillation (AO) on interannual sea surface temperature (SST) variations in the Alborán Sea, both separately and combined. The probability of observing mean annual SST values higher than average was related to NAO and AO values of the previous year. The effect of NAO on SST was negative, while that of AO was positive. The pure effects of NAO and AO on SST are obscuring each other, due to the positive correlation between them. When decomposing SST, NAO and AO in seasonal values, we found that variation in mean annual SST and mean winter SST was significantly related to the mean autumn NAO of the previous year, while mean summer SST was related to mean autumn AO of the previous year. The one year delay in the effect of the NAO and AO on the SST could be partially related to the amount of accumulated snow, as we found a significant correlation between the total snow in the North Alborán watershed for a year with the annual average SST of the subsequent year. A positive AO implies a colder atmosphere in the Polar Regions, which could favour occasional cold waves over the Iberian Peninsula which, when coupled with precipitations favoured by a negative NAO, may result in snow precipitation. This snow may be accumulated in the high peaks and melt down in spring-summer of the following year, which consequently increases the runoff of freshwater to the sea, which in turn causes a diminution of sea surface salinity and density, and blocks the local upwelling of colder water, resulting in a higher SST.
Aborto provocado e violência doméstica entre mulheres atendidas em uma maternidade pública de Salvador-BA
Diniz, Normélia Maria Freire;Gesteira, Solange Maria dos Anjos;Lopes, Regina Lúcia Mendon?a;Mota, Rosana Santos;Pérez, Bárbara Angélica Gómez;Gomes, Nadirlene Pereira;
Revista Brasileira de Enfermagem , 2011, DOI: 10.1590/S0034-71672011000600004
Abstract: quantitative study in order to study domestic violence in women with induced abortion. interviews were conducted with 147 women hospitalized for induced abortion in a public maternity hospital in salvador, bahia. the subjects are characterized by mostly women, black, poorly educated, economically dependent on spouses, experienced psychological abuse, physical and sexual abuse committed by their spouses. almost half of the women were victims of domestic violence during the current pregnancy, and that was the reason for inducing abortion for 67% of them. the study reveals an association between experience of domestic violence and induced abortion. as mental health consequences, they developed symptoms of post trauma stress disorder. it is necessary that the health professionals consider the cues to identify domestic violence as a health problem associated with induced abortion, which requires a transformation on the training model, including domestic violence as a health issue.
First record of parasitism in the mangrove oyster Crassostrea rhizophorae (Bivalvia: Ostreidae) at Jaguaribe River estuary - Ceará, Brazil
Sabry, RC;Gesteira, TCV;Boehs, G;
Brazilian Journal of Biology , 2007, DOI: 10.1590/S1519-69842007000400024
Abstract: mangrove oysters crassostrea rhizophorae were sampled monthly in the estuary of jaguaribe river, on the east coast of ceará state, brazil, between august, 2000 and december, 2001, making up 170 individuals. the water temperature varied from 26 to 30 °c and salinity from 21 to 42?. the animals' size ranged from 3.4 to 7.2 cm height. macroscopical and histopathological analyses were carried out in the oysters' tissues. the histological exams showed protozoans and metazoans of genera nematopsis and tylocephalum, respectively. nematopsis prevalence varied from 60 to 100% and it was higher in the gills and mantle. the oocysts presented a mean size of 11.5 μm (±1.32) length and 9.1 μm (±1.06) width (n = 30), up to 3 oocysts/phagocyte having been observed. several animals presented focal hemocitical reaction. the percentage of tylocephalum was 1.7%. in spite of the high infection prevalence by nematopsis, infected animals did not have their reproductive cycle impaired.
Into the life and death: RecA a WISE factor working to integrate survival and evolution in Escherichia coli  [PDF]
José María Gómez Gómez
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.43A059
Abstract:

Escherichia coli RecA has been considered traditionally a cellular protein with multiple vital functions working to ensure the maintenance of integrity of genome in each individual bacterial cell as well as promoting swarming migration in collectivity. On the contrary, recently it has been described that RecA promotes cellular apoptotic-like death (ALD), a pathway of programmed cellular death (PCD). In fact, RecA has been dubbed as the major apoptotic executor in E. coli. From these studies, RecA emerges as a prototypical Gin/Gan protein that despite of their intrinsic vital and lethal anfi-funcionality becomes in a WISE factor: a Worker to Integrate Survival and Evolution in E. coli evolving populations living in community. Here, I provide a review of recent experimental and conceptual advances trying to understand these RecA’s antagonistic roles in appearance contradictory under a unified biological vision.

Equilibrium Dynamics in the Neoclassical Growth Model with Habit Formation and Elastic Labor Supply  [PDF]
Manuel A. Gómez
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.25087
Abstract: This note analyzes the equilibrium dynamics in the neoclassical growth model with habit-forming preferences and elastic labor supply. Habits enter into utility in a multiplicative way. The specification of the habit formation process comprises the particular cases of internal and external habits. Existence, uniqueness and saddle-path stability of the steady state are proved analytically.
The Asakura-Oosawa model in the protein limit: the role of many-body interactions
A. Moncho-Jorda,A. A. Louis,P. G. Bolhuis,R. Roth
Physics , 2003, DOI: 10.1088/0953-8984/15/48/004
Abstract: We study the Asakura-Oosawa model in the "protein limit", where the penetrable sphere radius $R_{AO}$ is much greater than the hard sphere radius $R_c$. The phase behaviour and structure calculated with a full many-body treatment show important qualitative differences when compared to a description based on pair potentials alone. The overall effect of the many-body interactions is repulsive.
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