978 resultados para theoretical construction


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This paper develops a simple model that can be used to estimate the effectiveness of Cohesion expenditure relative to similar but unsubsidized projects, thereby making it possible to explicitly test an important assumption that is often implicit in estimates of the impact of Cohesion policies. Some preliminary results are reported for the case of infrastructure investment in the Spanish regions.

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We survey the main theoretical aspects of models for Mobile Ad Hoc Networks (MANETs). We present theoretical characterizations of mobile network structural properties, different dynamic graph models of MANETs, and finally we give detailed summaries of a few selected articles. In particular, we focus on articles dealing with connectivity of mobile networks, and on articles which show that mobility can be used to propagate information between nodes of the network while at the same time maintaining small transmission distances, and thus saving energy.

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In 2002 in the Ivory Coast three months of armed conflict ended with the division of the country. Two regions were separated by an interposition line controlled by the French Forces Licorne. This significant peace process was maintained over time, but characterized for lack of mutual confidence and political immobility, which led to an impasse and the continuation of Laurent Gbagbo in the presidency. Moreover, the peace building process was less successful because the different political agreements failed to address some of the main national problems, such as land property and identity issues. The following paper aims first to analyze the main facts and causes that instigated the conflict since the coup d’état in 2002. Secondly, the paper will analyze the peace process and point out the key elements of the Ouagadougou Peace Agreement (2007): the creation of a new and unique armed forces structure, as well as the identification of the population and implementation of an electoral process. The main goal is to provide the International Catalan Institute for Peace (ICIP) a working tool in order to send an electoral observation mission to this African country by November 2009.

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Trois mois de conflit armé en Côte d’Ivoire pendant l’année 2002 finirent par provoquer la division du pays en deux régions, séparées par une ligne d’interposition contrôlée par les Forces Licorne françaises. Le processus de paix se prolongea dans le temps, caractérisé par un manque de confiance mutuelle et une immobilité politique. Ces faits ont débouché sur une situation d’impasse et la permanence de Laurent Gbagbo à la présidence du pays. De plus, les différents accords politiques n’aidèrent pas le processus de construction de la paix, puisqu’ils n’abordaient pas certains problèmes principaux du pays, comme par exemple la propriété des terres et les sujets concernant l’identité. Ce document de travail aspire, tout d’abord, à analyser les faits principaux et les causes qui provoquèrent le conflit à partir du coup d’état de 2002. En deuxième lieu, le document analyse le processus de paix et signale les éléments clé de l’Accord de Paix d’Ouagadougou (2007): la création d’une nouvelle et unique structure des forces armées, ainsi que l’identification de la population et la réalisation d’un processus électoral. L’objectif principal est de fournir un outil de travail à l’Institut Catalan International pour la Paix (ICIP) afin d’envoyer une mission d’observation électorale dans ce pays africain.

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This article addresses the normative dilemma located within the application of `securitization,’ as a method of understanding the social construction of threats and security policies. Securitization as a theoretical and practical undertaking is being increasingly used by scholars and practitioners. This scholarly endeavour wishes to provide those wishing to engage with securitization with an alternative application of this theory; one which is sensitive to and self-reflective of the possible normative consequences of its employment. This article argues that discussing and analyzing securitization processes have normative implications, which is understood here to be the negative securitization of a referent. The negative securitization of a referent is asserted to be carried out through the unchallenged analysis of securitization processes which have emerged through relations of exclusion and power. It then offers a critical understanding and application of securitization studies as a way of overcoming the identified normative dilemma. First, it examines how the Copenhagen School’s formation of securitization theory gives rise to a normative dilemma, which is situated in the performative and symbolic power of security as a political invocation and theoretical concept. Second, it evaluates previous attempts to overcome the normative dilemma of securitization studies, outlining the obstacles that each individual proposal faces. Third, this article argues that the normative dilemma of applying securitization can be avoided by firstly, deconstructing the institutional power of security actors and dominant security subjectivities and secondly, by addressing countering or alternative approaches to security and incorporating different security subjectivities. Examples of the securitization of international terrorism and immigration are prominent throughout.

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An indirect estimate of consumable food and probability of acquiring food in a blowfly species, Chrysomya putoria, is presented. This alternative procedure combines three distinct models to estimate consumable food in the context of the exploitative competition experienced by immature individuals in blowfly populations. The relevant parameters are derived from data for pupal weight and survival and estimates of density-independent larval mortality in twenty different larval densities. As part of this procedure, the probability of acquiring food per unit of time and the time taken to exhaust the food supply are also calculated. The procedure employed here may be valuable for estimations in insects whose immature stages develop inside the food substrate, where it is difficult to partial out confounding effects such as separation of faeces. This procedure also has the advantage of taking into account the population dynamics of immatures living under crowded conditions, which are particularly characteristic of blowflies and other insects as well.

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L’estudi dels materials de construcció és una part fonamental de la formació de l’estudiantat en l’àmbit de la Enginyeria Civil. En aquest context, una part rellevant de les assignatures de Química de Materials i Materials de Construcció és aquella que fa referència als diversos mètodes d’assaig i procediments que ens permeten analitzar i estudiar les característiques d’un material. Per aquesta raó, és de gran importància que els alumnes puguin disposar d’unes determinades hores en les quals l’aprenentatge es realitza a través de la pràctica en el laboratori dels procediments estudiats a classe i la realització d’un informe posterior en el qual quedin reflectits els coneixements adquirits durant l’activitat en el laboratori. Malauradament, la realització de pràctiques en el laboratori du aparellades una sèrie de limitacions (espai, temps, utilització de reactius perillosos o instrumental sofisticat), que fan que el nombre d’activitats d’aquesta mena sigui necessàriament restringit. D'altra banda, l'estudi dels materials només es completa quan els coneixements adquirits a l'aula i al laboratori surten d'aquests àmbits i es confronten amb les situacions reals amb les quals es pot trobar un enginyer durant l'exercici de la seva professió. L'organització de visites a diverses instal·lacions al llarg del curs cobreix en part aquesta necessitat, tot i alguns inconvenients logístics (grups nombrosos, alumnes de mobilitat reduïda i altres). La finalitat d'aquest projecte ha estat posar en funcionament una dinàmica de treball que permeti a l'estudiantat aprofundir en el coneixement dels materials de construcció i el seu comportament en situacions reals amb les quals es trobarà en l'exercici de la seva professió. Aquesta metodologia es basa en l'ús de materials audiovisuals elaborats sota criteris d'adequació pedagògica i que responen a les demandes professionals del futur enginyer. Les possibilitats ofertes per un entorn virtual d'aprenentatge (tecnologia Moodle) permeten el disseny d'activitats que motivin l’autoaprenentatge de l’alumnat.