Search results for "STICS"

Beliefs about second language acquisition held by dysphatic students

2006

Max–min dispersion with capacity and cost for a practical location problem

2022

Diversity and dispersion problems deal with selecting a subset of elements from a given set in such a way that their diversity is maximized. This study considers a practical location problem recently proposed in the context of max–min dispersion models. It is called the generalized dispersion problem, and it models realistic applications by introducing capacity and cost constraints. We propose two effective linear formulations for this problem, and develop a hybrid metaheuristic algorithm based on the variable neighborhood search methodology, to solve real instances. Extensive numerical computational experiments are performed to compare our hybrid metaheuristic with the state-of-art heurist…

Herramientas matemáticas para la valoración de la ampliación de una infraestructura portuaria

2003

infraestructura portuaria ya consolidada, que conlleva unas inversiones a largo plazo. Para ello hay que recurrir a medios de an´alisis capaces de recoger, en la medida de lo posible, la incertidumbre sobre la futura evoluci´on de los tr´aficos de mercanc´?as, sobre el efecto de la competencia entre puertos, etc., y que los m´etodos tradicionales no aproximan en toda su dimensi´on. Existe, adem´as, un problema de decisi´on de pol´?tica ´optima de gesti´on del proyecto que depende de variables de decisi´on que modelizan las opciones presentes en el mismo. Las oportunidades de inversi´on han sido tratadas como una colecci´on de opciones americanas sobre activos reales. Nosotros hemos optado p…

Parallel global optimization : structuring populations in differential evolution

2010

On automatic algorithm configuration of vehicle routing problem solvers

2019

Many of the algorithms for solving vehicle routing problems expose parameters that strongly influence the quality of obtained solutions and the performance of the algorithm. Finding good values for these parameters is a tedious task that requires experimentation and experience. Therefore, methods that automate the process of algorithm configuration have received growing attention. In this paper, we present a comprehensive study to critically evaluate and compare the capabilities and suitability of seven state-of-the-art methods in configuring vehicle routing metaheuristics. The configuration target is the solution quality of eight metaheuristics solving two vehicle routing problem variants.…

Hybrid nanocomposites with ultra-low filling content by nano-coating fragmentation

2021

In the current study, a new technique for the manufacturing of polymer nanocomposites (PNCs) with ultra-low filling content (<0.05 wt%) is presented. Specifically, this method has been validated through the production of polypropylene (PP) nanocomposites with Ag nanoparticles. The presented method first consisted in a metal nano-film deposition on PP pellet substrates by a physical vapor deposition (PVD) sputtering equipment. Subsequently, a percentage of the coated pellet was mixed to uncoated ones via an injection molding machine to produce the PNC in a single step. Different mixing percentages of coated PP pellet to the uncoated ones were studied. As a result, the fragmentation of the…

Sulle origini della ‘telicità’: κίνησις ed ἐνέργεια in Aristotele

2014

Nell’ambito della classificazione aspettuale dei verbi un ruolo particolare riveste la distinzione del tratto telico-atelico, alla base della tradizionale suddivisione tra le classi vendleriane rispettivamente di accomplishment e achievement da una parte e states e activities dall’altra. Nonostante la rilevanza di tale tratto nella riflessione linguistica contemporanea, a tutt’oggi gli studiosi non condividono una definizione univoca della telicità, soprattutto perché dietro ad ogni definizione si nasconde una diversa prospettiva teorica. Scopo del presente lavoro è un’analisi dell’origine del termine nella teoria linguistica, che è solita ricondurre la distinzione del tratto telico-atelico…

Treading lightly on the Earth. Metaphorical frames in the discourse of ecotourism

2013

The present contribution aims to analyse the underlying metaphorical conceptualizations which frame the discourse of ecotourism and their similar or different surface realisations across languages and cultures (American English, British English and Italian). It addresses the issue of ideological categories construed by the discourse of ecotourism to promote its message in order to “persuade potential customers into becoming actual clients by addressing their cultural needs and personal motivations to travel” (Edwards and Curado 2003: 26). Ideology, in this work, relies on van Dijk’s (1998: 9) conceptualization as ‘social cognition’, namely a system of values, beliefs, thoughts shared by mem…

Cómo mirar una parte del mundo: el vocabulario del cuerpo en una lengua amerindia

2006

This paper analyses the vocabulary of body parts in Cha’palaachi, an Amerindian language of the Republic of Ecuador. A number of basic roots refers to (a) forms or (b) parts of the body, although in some cases reference is made to general areas more than to specific parts. These areas, as well as the general vocabulary of forms, points to the importance of spatial elements in Cha’palaachi, which is also identifiable in other parts of the vocabulary and grammar. A significant point is that the body-part terms are organised on the basis of the reference to form, in such a way that the body-part element itself is only of secondary importance. Metaphorical and metonymic extension is more freque…

Mercury and Amino Acid Content Relations in Northern Pike (Esox Lucius) in Subarctic Lakes Along a Climate-Productivity Gradient

2023

Mercury is a highly toxic element for consumers, but its relation to amino acids and physiology of wild fish is not well known. The main aim of this study was to evaluate how total mercury content (THg) of northern pike (Esox lucius) is related to amino acids and potentially important environmental and biological factors along a climate-productivity gradient of ten subarctic lakes. Linear regression between THg and sixteen amino acids content [nmol mg−1 dry weight] from white dorsal muscle of pike from these lakes were tested. Lastly, a general linear model (GLM) for age-corrected THg was used to test which factors are significantly related to mercury content of pike. There was a positive r…