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Dive into the research topics where Emmanuel N. Millán is active.

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Featured researches published by Emmanuel N. Millán.


Physical Review E | 2016

Nucleation of plasticity in nanoparticle collisions.

Emmanuel N. Millán; Diego Tramontina; Herbert M. Urbassek; Eduardo M. Bringa

While at small collision velocities collisions of nanoparticles (NPs) are elastic, they become plastic at higher velocities. We study the elastic-plastic threshold and the onset of plasticity using molecular dynamics simulation for a Lennard-Jones material. The reasons behind the R^{-2/3} increase of the threshold velocity for small NP radii R found recently are discussed. At the threshold, NP orientation strongly influences the generation of plasticity, and averaging over many orientations is required to predict the critical velocity for dislocation generation. The onset of plasticity is governed by the generation of isolated stacking faults and nanotwins spanning the entire NP. At higher velocities, the fraction of defects becomes proportional to the total number of atoms in the NP.


Computers & Electrical Engineering | 2015

Performance analysis of Cellular Automata HPC implementations

Emmanuel N. Millán; Carlos S. Bederian; María Fabiana Piccoli; Carlos García Garino; Eduardo M. Bringa

We present a free open source code for Cellular Automata (CA) using MPI.Weak and strong scaling tests are carried out in 3 different architectures.Performance of our code compares well with performance of other mature HPC codes.Hardware counters are used to help identifying performance issues. Display Omitted Cellular Automata (CA) are of interest in several research areas and there are many available serial implementations of CA. However, there are relatively few studies analyzing in detail High Performance Computing (HPC) implementations of CA which allow research on large systems. Here, we present a parallel implementation of a CA with distributed memory based on MPI. As a first step to insure fast performance, we study several possible serial implementations of the CA. The simulations are performed in three infrastructures, comparing two different microarchitectures. The parallel code is tested with both Strong and Weak scaling, and we obtain parallel efficiencies of ~ 75%-85%, for 64 cores, comparable to efficiencies for other mature parallel codes in similar architectures. We report communication time and multiple hardware counters, which reveal that performance losses are related to cache references with misses, branches and memory access.


Astronomy and Astrophysics | 2017

Dust-aggregate impact into granular matter: A systematic study of the influence of projectile velocity and size on crater formation and grain ejection

María Belén Planes; Emmanuel N. Millán; Herbert M. Urbassek; Eduardo M. Bringa

Context. Dust impact into granular materials leads to crater formation and material ejection. Aims. The impact of dust aggregates, composed of a number N p of grains, into a granular bed consisting of the same grains is studied as a function of impact velocity v and projectile size N p . No gravitational effects are included. Methods. Granular-mechanics simulations are used to study the outcome of dust-aggregate impacts. The granular bed and the aggregates are composed of silica grains and have filling factor 0.36. Results. Both the crater volume and the ejection yield increase sublinearly with total impact energy. No crater rims are formed. Crater shapes change from hemispheric to elongated when increasing either projectile size or velocity. The crater walls are compacted by the impact within a zone of a size comparable to the crater radius. Ejecta are produced at the edges of the impact; only a small fraction of the ejecta stem from the projectile. The energy distribution of the ejecta follows at high energies a 1/ E 2 decay reminiscent of sputtering from atomic targets. The maximum of the distribution is shifted to higher energies for larger projectiles; this is caused by the increasing depth from which ejected grains originate. Conclusions. Due to the dissipative nature of intergranular collisions and the porosity of the target, crater morphology and ejecta yield deviate characteristically from impacts into atomic materials.


Physical Chemistry Chemical Physics | 2016

The elastic–plastic transition in nanoparticle collisions

Emmanuel N. Millán; Diego Tramontina; Herbert M. Urbassek; Eduardo M. Bringa


Physical Chemistry Chemical Physics | 2017

The bouncing threshold in silica nanograin collisions

Maureen L. Nietiadi; Tiffany Tjong; Yudi Rosandi; Emmanuel N. Millán; Eduardo M. Bringa; Herbert M. Urbassek


Journal of Physics and Chemistry of Solids | 2017

Thermodynamics of the melting process in Au nano-clusters: Phenomenology, energy, entropy and quasi-chemical modeling

Dalía S. Bertoldi; Emmanuel N. Millán; Armando Fernández Guillermet


XVIII Congreso Argentino de Ciencias de la Computación | 2013

Parallel implementation of a cellular automata in a hybrid CPU/GPU environment

Emmanuel N. Millán; Paula Martínez; Graciela Verónica Gil Costa; María Fabiana Piccoli; Alicia Marcela Printista; Carlos S. Bederian; Carlos García Garino; Eduardo M. Bringa


Computational Materials Science | 2018

Mechanical properties of Au foams under nanoindentation

Carlos J. Ruestes; Daniel Schwen; Emmanuel N. Millán; Emiliano Aparicio; Eduardo M. Bringa


arXiv: Populations and Evolution | 2015

Evaluating the importance of environmental factors on the spatial distribution of livestock settlements in the Monte desert with a Monte Carlo based model: Settlement Dynamics in Drylands (SeDD)

Emmanuel N. Millán; Silvana B. Goirán; Julieta N. Aranibar; Leonardo Forconesi; Carlos García Garino; Eduardo M. Bringa


Archive | 2013

A GPU implementation for improved granular simulations with LAMMPS

Emmanuel N. Millán; Christian Ringl; Carlos S. Bederian; María Fabiana Piccoli; Carlos García Garino; Herbert M. Urbassek; Eduardo M. Bringa

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Eduardo M. Bringa

Facultad de Ciencias Exactas y Naturales

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Carlos S. Bederian

National Scientific and Technical Research Council

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Carlos J. Ruestes

Facultad de Ciencias Exactas y Naturales

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Alicia Marcela Printista

National University of San Luis

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Armando Fernández Guillermet

National Scientific and Technical Research Council

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Dalía S. Bertoldi

National Scientific and Technical Research Council

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