22,056 research outputs found
Impurity segregation in graphene nanoribbons
The electronic properties of low-dimensional materials can be engineered by
doping, but in the case of graphene nanoribbons (GNR) the proximity of two
symmetry-breaking edges introduces an additional dependence on the location of
an impurity across the width of the ribbon. This introduces energetically
favorable locations for impurities, leading to a degree of spatial segregation
in the impurity concentration. We develop a simple model to calculate the
change in energy of a GNR system with an arbitrary impurity as that impurity is
moved across the ribbon and validate its findings by comparison with ab initio
calculations. Although our results agree with previous works predicting the
dominance of edge disorder in GNR, we argue that the distribution of adsorbed
impurities across a ribbon may be controllable by external factors, namely an
applied electric field. We propose that this control over impurity segregation
may allow manipulation and fine-tuning of the magnetic and transport properties
of GNRs.Comment: 5 pages, 4 figures, submitte
Exponential behavior of the interlayer exchange coupling across non-magnetic metallic superlattices
It is shown that the coupling between magnetic layers separated by
non-magnetic metallic superlattices can decay exponentially as a function of
the spacer thickness , as opposed to the usual decay. This effect
is due to the lack of constructive contributions to the coupling from extended
states across the spacer. The exponential behavior is obtained by properly
choosing the distinct metals and the superlattice unit cell composition.Comment: To appear in Phys. Rev.
Large Eddy Simulation Combined With Equivalent Diameter For Turbulent Jet Modelling And Gas Dispersion
CFD modelling combines transport phenomena and numerical approaches to solve physical problems. Although numerical modelling of flow scenarios is the cutting edge of flow modelling, there seems to be room for improvement. This paper proposes an approach for jet modelling in a low Mach number computational code. The methodology is based on the equivalent diameter and velocity profile calculated downstream from the jet leak orifice. The novel model DESQr (Diameter of Equivalent Simulation for Quicker Run) is combined with LES (Large Eddy Simulation) to calculate the gas jet profile due to accidental releases. The model is implemented in the framework of FDS (Fire Dynamics Simulator) and the open source code is modified to handle gas dispersion scenarios. Numerical findings for jet modelling and gas dispersion are compared with experimental data. The results are also compared with a commercial CFD tool. Good agreement is observed. Significant computational time reduction is achieved. A free open source CFD tool emerges and the results presented in this work are promising.33352554020th Brazilian Congress of Chemical Engineering (COBEQ)OCT 19-22, 2014Florianopolis, BRAZI
Retraction methods and fixed point free maps with null minimal displacements on unit ball
In this paper we consider the class of H\"older-Lipschitz maps on unit ball
of a Banach space , and the question we deal with is whether for any
and there exists a fixed-point free map such that for all and . We show that if has a spreading
Schauder basis then such a map can always be built, answering a question posed
by the first author in \cite{Bar}. In the general case, using a recent approach
of R. Medina \cite{M} concerning H\"older retractions of -flat closed
convex sets, we show that for any decreasing null sequence , there exists a fixed-point free mapping on so that
for all and
. New results related to Lipschitz maps are also obtained.Comment: Comments welcom
A Review of 'Human Insecurities in Southeast Asia'
Debates on human insecurities are crucial in a changing world that witnesses high social inequality, degradation of environment, social tensions and a growing violation of human rights. Unfortunately, all these issues permeate the social structures of Southeast Asian countries in different ways. In that region civil society faces problems that are diverse, as seen in the political tensions in Thailand, the deterritorialization of indigenous peoples in Philippines and Malaysia, human rights violations in Myanmar, and numerous other challenges. Such setting demands different approaches from institutions and communities to overcome pending risks threatening their populations
A Review of ‘Human Insecurities in Southeast Asia’
Debates on human insecurities are crucial in a changing world that witnesses high social inequality, degradation of environment, social tensions and a growing violation of human rights. Unfortunately, all these issues permeate the social structures of Southeast Asian countries in different ways. In that region civil society faces problems that are diverse, as seen in the political tensions in Thailand, the deterritorialization of indigenous peoples in Philippines and Malaysia, human rights violations in Myanmar, and numerous other challenges. Such setting demands different approaches from institutions and communities to overcome pending risks threatening their populations
A Review of 'Law's Impunity: Responsibility and the Modern Private Military Company'
The mercenaries and mercenarism are two points of concern for scholars studying the rules of war throughout history. Both in jus ad bellum (JAB) and jus in bellum (JIB) we can find a framework of international law crafted to impede the participation of individuals motivated to take part in hostilities to get private gain. Nevertheless, paradoxically, the problem is when corporations are supported by domestic law to perform serviced in ground combats abroad. In the latter case, Human Rights Law (HRL), International Humanitarian Law (IHL) and International Criminal Law (ICL) present numerous gaps that make it difficult to incriminate corporations, which perpetuate the impunity among private organizations involved in human rights violations in conflict zones
Two-component mixture of charged particles confined in a channel: melting
The melting of a binary system of charged particles confined in a {\it
quasi}-one-dimensional parabolic channel is studied through Monte Carlo
simulations. At zero temperature the particles are ordered in parallel chains.
The melting is anisotropic and different melting temperatures are obtained
according to the spatial direction, and the different types of particles
present in the system. Melting is very different for the single-, two- and
four-chain configurations. A temperature induced structural phase transition is
found between two different four chain ordered states which is absent in the
mono-disperse system. In the mixed regime, where the two types of particles are
only slightly different, melting is almost isotropic and a thermally induced
homogeneous distribution of the distinct types of charges is observed.Comment: To appear in Journal of Physics: condensed matter ; (13 pages, 12
figures
A Review of 'Law's Impunity: Responsibility and the Modern Private Military Company'
The mercenaries and mercenarism are two points of concern for scholars studying the rules of war throughout history. Both in jus ad bellum (JAB) and jus in bellum (JIB) we can find a framework of international law crafted to impede the participation of individuals motivated to take part in hostilities to get private gain. Nevertheless, paradoxically, the problem is when corporations are supported by domestic law to perform serviced in ground combats abroad. In the latter case, Human Rights Law (HRL), International Humanitarian Law (IHL) and International Criminal Law (ICL) present numerous gaps that make it difficult to incriminate corporations, which perpetuate the impunity among private organizations involved in human rights violations in conflict zones
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