The common view has it that there are two families of approaches towards the logical structure of impossible worlds – Australasian and North American. According to the first, impossible worlds are closed under the relation of logical consequence of one of the non-classical logics. The North American approach is more liberal, allowing for impossible worlds where no logic holds. After pointing out the questionable consequences of each view, I propose a third one. While this new perspective allows for worlds where no logical consequence holds, it also imposes some constraints on what worlds are built upon. This renders the proposed view not as restrictive as the Australasian approach and not as liberal as the North American approach. Due to its intermediary nature, I have named this perspective ‘the Pacific’ approach.

Although mereotopological relationship theories and their qualification problems have been extensively studied in R^2, the qualification of mereotopological relations in R^3 remains challenging. This is due to the limited availability of topological operators and high costs of boundary intersection tests. In this paper, a novel qualification technique for mereotopological relations in R^3 is presented. Our technique rapidly computes RCC-8 base relations using precomputed signed distance fields, and makes no assumptions with regards to complexity or representation method of the spatial entities under consideration.

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This paper presents a comparison of two software tools for technical support in the international frequency coordination of geostationary satellite networks: Visualyse GSO and Sat-Coord. These tools allow the calculation of carrier to noise ratio, carrier to interference ratio, orbital separation arcs and other important parameters described in the radio regulations of the International Telecommunications Union (ITU). In order to better understand the features of these software tools, an overview of the international frequency coordination process for geostationary satellite networks, in planned and non-planned frequency bands is included, as well as general information about the Colombian orbit/Spectrum resource status. The obtained results have been useful for technical studies on coordination of the national Orbit/Spectrum resources, carried out by the Colombian National Spectrum Agency

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Gabriel Tarducci (AEIEF IdHICS FAHCE CONICET, Seminario de Actividad física para la salud, FAHCE UNLP) gtarducci@hotmail.com Gabriela Butler Tau (Cátedra de Teoría de la práctica artística, FBA UNLP) gabrielabutler@hotmail.com Sofía Gárgano (AEIEF IdHICS FAHCE CONICET, CIC Prov. de Buenos Aires) gargano.sofia@gmail.com Agustina Gandini (AEIEF IdHICS FAHCE CONICET) agusgandini11@gmail.com Gustavo Lencina (Cátedra de Teoría de la práctica artística, FBA UNLP) guslenc@gmail.com Rosa Biera (AEIEF IdHICS FAHCE CONICET) Rosy_biera@hotmail.com Mara Valle (AEIEF IdHICS FAHCE CONICET) maravalle_13@hotmail.com Patricia Ciocchini (Cátedra de Teoría de la práctica artística, FBA UNLP) patriciaciochini@hotmail.com Teresa Inés Olmedo (AEIEF IdHICS FAHCE CONICET) teresita_olmedo@hotmail.com María Eugenia Villa (CICES IdHICS FAHCE CONICET) qkvilla@hotmail.com Lorena Berdula (AEIEF IdHICS FAHCE CONICET) profaberdula@hotmail.com Hernán Díaz (FUNDADEPS, UNIVERSIDAD COMPLUTENSE DE MADRID) heraldi@yahoo...

Lewis (1968) claims that his language of Counterpart Theory (CT) interprets modal discourse and he adverts to a translation scheme from the language of Quantified Modal Logic (QML) to CT. However, everybody now agrees that his original translation scheme does not always work, since it does not always preserve the ‘intuitive’ meaning of the translated QML-formulas. Lewis discusses this problem with regard to the Necessitist Thesis, and I will extend his discourse to the analysis of the Converse Barcan Formula.Everyone also agrees that there are CT-formulas that can express the QML-content that gets lost through the translation. The problem is how we arrive to them. In this paper, I propose new translation rules from QML to CT, based on a suggestion by Kaplan. However, I will claim that we cannot have ‘the’ translation scheme from QML to CT. The reason being that de re modal language is ambiguous. Accordingly, there are different sorts of QML, depending on how we resolve such ambiguit...