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The index of symmetry of three-dimensional Lie groups with a left-invariant metric
(De Gruyter, 2018-10)
We determine the index of symmetry of 3-dimensional unimodular Lie groups with a left-invariant metric. In particular, we prove that every 3-dimensional unimodular Lie group admits a left-invariant metric with positive ...
A non-permutation flowshop scheduling problem with lot streaming: A mathematical model
(Growing Science, 2016-06)
In this paper we investigate the use of lot streaming in non-permutation flowshop scheduling problems. The objective is to minimize the makespan subject to the standard flowshop constraints, but where it is now permitted ...
Historically Unprecedented Retreat Of The Viedma Glacier: Challenges And Opportunities
(Science Trends, 2018-10)
Fresh water is a scarce yet strategic resource. Its availability and accessibility have a great impact not only on human lives, as it is a source of social and economic development, but also on all living organisms on ...
Naturally reductive pseudo-riemannian 2-step nilpotent lie groups
(University of Houston, 2013-01)
This paper deals with naturally reductive pseudo-Riemannian 2- step nilpotent Lie groups for which the metric is invariant under a left action. The case of nondegenerate center is characterized as follows. The simply ...
Air-cooled heat exchanger design using successive quadratic programming (SQP)
(Taylor & Francis, 2001-12)
A nonlinear optimization algorithm is applied to the design of air-cooled heat exchangers. In such equipment, the cold fluid (air) is impelled across banks of finned tubes by means of fans in forced or induced draft. The ...
Applied ecologists in a landscape of fear
(Wiley Blackwell Publishing, Inc, 2019-05)
Fear is a powerful response to danger, and a strong driver of evolution. The "landscape of fear" concept has helped ecologists to describe how animals’ perception of predation risk alters their spatial (e.g. Laundré, ...
Boltzmann or Gibbs Entropy?: Thermostatistics of Two Models with Few Particles
(Scientific Research, 2015-07-15)
We study the statistical mechanics of small clusters (N ~ 10 - 100) for two-level systems and harmonic oscillators. Both Boltzmann’s and Gibbs’s definitions of entropy are used. The properties of the studied systems are ...
A model for atomic hydrogen-bimetal interactions
(Pergamon-Elsevier Science Ltd, 2012-10-31)
The adsorption of atomic H on the bimetallic FeNi(111) surface has been studied by ASED-MO tight binding calculations. The energy of the system was calculated by the atom superposition and electron delocalization molecular ...
Tres preguntas sobre guerra y genocidio
(Universidad de Buenos Aires. Facultad de Filosofía y Letras, 2019-11)
A lo largo del siglo XX el aparato conceptual para abordar la violencia asociadaa los procesos de formación estatal, colonialismo, segregación y exterminioétnico, guerras interestatales y de liberación, ha producido un ...
Energy transfer in Hall-MHD turbulence: Cascades, backscatter, and dynamo action
(Cambridge University Press, 2007-12)
Scale interactions in Hall magnetohydrodynamics (MHDs) are studied using both the mean field theory derivation of transport coefficients, and direct numerical simulations in three space dimensions. In the magnetically ...