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A heuristic approach for scheduling activities with ‘OR’- precedence constraints at an underground mine
(Taylor & Francis, 2020)
Medium-term development planning of underground mines requires scheduling multiple activities to comply with long-term milestones, and to obtain a time span as short as possible. However, the planning must also respect the ...
Value of corrective network security for distributed energy storage applications
(Inst Engineering Technology -IET, 2016)
Energy storage can provide services to several sectors in electricity industry, including generation, transmission and distribution, where conflicts and synergies may arise when storage is used to manage network congestion ...
Separation of four isomeric tropane alkaloids from Schizanthus grahamiii by non-aqueous capillary electrophoresis
(2005)
The potential of non-aqueous capillary electrophoresis was investigated for the separation of four isomeric tropane alkaloids, namely 3α-senecioyloxy-7β-hydroxytropane, 3α-hydroxy-7β-senecioyloxytropane, 3α-hydroxy-7β-an ...
Iron ore sintering. Part 3: Automatic and control systems
(Universidad Nacional de Colombia (Sede Medellín). Facultad de Minas., 2015-03-01)
The sintering process involves a large number of parameters, more than 500, each of which exerts a greater or lesser influence and needs to be controlled, within the possible limits, in order to optimise productivity, ...
Thin-layer detection using spectral inversion and a genetic algorithm
(UNIVERSIDAD NACIONAL DE COLOMBIA, 2011)
Spectral inversion using a genetic algorithm (GA) as an optimisation approach was used for increasing the seismic resolution of a particular dataset; by contrast with the conjugate gradient method, a GA does not require a ...
Numerical Modelling of Water Flow Through Granular Material for Isolated and Simultaneous Extractions in Block Caving
(Springer-Verlag Wien, 2019)
© 2018, Springer-Verlag GmbH Austria, part of Springer Nature. In this work, we numerically solve the Brinkman–Darcy equation coupled to the granular kinematic model using the finite elements method in 2D, to describe the ...
The effect of substrate media on the removal of arsenic, boron and iron from an acidic wastewater in planted column reactors
(Elsevier, 2012-01)
Acidic wastewaters, such as occur in acid mine drainage, typically contain heavy metals and metalloids that pose a serious threat to receiving waters, due to their high toxicity. In this study, vertical flow wetland columns, ...
Semantics and canonicalisation of SPARQL 1.1
(IOS PRESS, 2022)
We define a procedure for canonicalising SPARQL 1.1 queries. Specifically, given two input queries that return the
same solutions modulo variable names over any RDF graph (which we call congruent queries), the canonicalisation ...
Fourier approach to homogenization problems
(2002-06)
This article is divided into two chapters. The classical problem of homogenization of
elliptic operators with periodically oscillating coe cients is revisited in the rst chapter. Following
a Fourier approach, we discuss ...
Estudio y comparación en eficiencia espectral y probabilidad de error de los esquemas de modulación gmsk y dbpsk
(Universidad Nacional de Colombia - Facultad de Ingeniería, 2008)
GMSK (Gaussian Minimum Shift Keying) y DBPSK (Differential Binary Phase Shift Keying) son dos esquemas de modulación digi-tal usados frecuentemente en los sistemas de comunicaciones vía radio; sin embargo, existe ...