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In this research, a low-cost template-based process has been developed to structure the surfaces of polymeric materials rendering them superhydrophobic. This biology-inspired approach was developed using results from the first part of this thesis: the first known detailed study of superhydrophobic aspen leaf surfaces. Aspen leaves, similar to lotus leaves, possess a dual-scale hierarchical surface structure consisting of micro-scale papillae covered by nano-scale wax crystals, and this surface structure was used as a blueprint in the structuring of templates. These distinctive surface features coupled with a hydrophobic surface chemistry is responsible for these leaves’ extreme non-wetting property. Non-wetting is further augmented by the unique high aspect ratio aspen leafstalk geometry. The slender leafstalks offer very little resistance to twisting and bending, which results in significant leaf movement in the slightest breeze, facilitating water droplet roll-off. The structured template surfaces, produced by sand blasting and chemical etching of electrodeposited nanocrystalline nickel sheets, resemble the negative of the superhydrophobic aspen leaf surfaces. Re-usable templates were subsequently employed in a hot embossing technique where they were pressed against softened polymers (polyethylene, polypropylene and polytetrafluoroethylene) thereby transferring their surface structures. The resulting pressed polymer surfaces exhibited features very similar to aspen leaf surfaces. This process increased the water contact angle for all pressed polymers to values above 150 degrees. Additionally, after pressing the water roll-off angle for all polymer surfaces dropped below 5 degrees. The effects of water surfactant concentration, water drop size and temperature on the wetting characteristics of the structured polymers were studied to indicate in which applications these functional surfaces could be most beneficial. Coupling this attractive superhydrophobic surface property with mechanical motion (shaking, bending, or vibrating) could result in superhydrophobic surfaces with superior non-wetting properties suitable for a wide range of applications.

In this research, a low-cost template-based process has been developed to structure the surfaces of polymeric materials rendering them superhydrophobic. This biology-inspired approach was developed using results from the first part of this thesis: the first known detailed study of superhydrophobic aspen leaf surfaces. Aspen leaves, similar to lotus leaves, possess a dual-scale hierarchical surface structure consisting of micro-scale papillae covered by nano-scale wax crystals, and this surface structure was used as a blueprint in the structuring of templates. These distinctive surface features coupled with a hydrophobic surface chemistry is responsible for these leaves’ extreme non-wetting property. Non-wetting is further augmented by the unique high aspect ratio aspen leafstalk geometry. The slender leafstalks offer very little resistance to twisting and bending, which results in significant leaf movement in the slightest breeze, facilitating water droplet roll-off. The structured template surfaces, produced by sand blasting and chemical etching of electrodeposited nanocrystalline nickel sheets, resemble the negative of the superhydrophobic aspen leaf surfaces. Re-usable templates were subsequently employed in a hot embossing technique where they were pressed against softened polymers (polyethylene, polypropylene and polytetrafluoroethylene) thereby transferring their surface structures. The resulting pressed polymer surfaces exhibited features very similar to aspen leaf surfaces. This process increased the water contact angle for all pressed polymers to values above 150 degrees. Additionally, after pressing the water roll-off angle for all polymer surfaces dropped below 5 degrees. The effects of water surfactant concentration, water drop size and temperature on the wetting characteristics of the structured polymers were studied to indicate in which applications these functional surfaces could be most beneficial. Coupling this attractive superhydrophobic surface property with mechanical motion (shaking, bending, or vibrating) could result in superhydrophobic surfaces with superior non-wetting properties suitable for a wide range of applications.

The study of Borel equivalence relations on Polish spaces has become a major area of focus within descriptive set theory. Primarily, work in this area has been carried out using the standard methods of descriptive set theory. In this work, however, we develop a model-theoretic framework suitable for the study of Borel equivalence relations, introducing a class of objects we call Borel structurings. We then use these structurings to examine conditions under which marker sets for Borel equivalence relations can be concluded to exist or not exist, as well as investigating to what extent the Compactness Theorem from first-order logic continues to hold for Borel structurings.

This dissertation considers repetition phenomena in Hindi-English bilingual discourse. Through analysis of everyday Hindi-English conversations, I demonstrate that code-switching and related bilingual phenomena systematically expand options bilingual speakers have for structuring discourse, managing interactions, and making linguistic and social meaning. The systematicity and strategy of Hindi-English code-switching are particularly apparent in what I term bilingual repetition. In bilingual repetition, the semantic content of an utterance in one language is repeated in another language, usually in close proximity to the first occurrence. Bilingual repetition is encountered throughout South Asian multilingual contexts ranging from casual conversations to printed advertisements to Bollywood dialogues. I also consider repetition as a discourse-level areal feature of South Asia. Both monolingual and bilingual repetition phenomena offer an opportunity to investigate alternatives for making meaning both within and across languages due to the side-by-side presentation of semantically and formally related messages. Ultimately, code-switching and repetition in Hindi-English bilingual discourse emerge as practices that both create and reflect linguistic and social simultaneity. / text

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Orientador: Edmir Daniel Carvalho / Banca: Gilmar Bastos Santos / Banca: Ana Paula Vidotto Magnoni / Resumo: A criação de peixes em gaiolas ou tanques-rede iniciou-se há mais de 50 anos, no Delta do rio Mekong. Atualmente, este tipo de cultivo está se expandido em represas brasileiras, tendo como modelo a espécie não nativa Tilápia-do-Nilo (Oreochromis niloficus). Contudo os impactos decorrentes desta atividade sobre a ictiofauna são pouco conhecidos. Sendo assim, o objetivo deste trabalho é caracterizar a estrutura e composição das assembléias de peixes agregadas ao sistema de piscicultura e do respectivo trecho controle e, com base em atributos ecológicos, inferir possíveis impactos destes sistemas sobre a ictiofauna residente da represa de Chavantes. Para tal foram realizadas coletas, com redes de espera, nos meses de outubro e dezembro de 2007 na área onde seriam instalados os tanques-rede (pré- Tanque) e no período de abril/2008 a março/2009 (pós-Tanque), ao redor dos tanquesrede (TR) e em um trecho controle (CT) - sem interferência deste sistema. Entre os períodos pré-TR e TR foram encontradas diferenças com relação à composição de espécies e às médias de captura em número e biomassa. Entre os trechos TR e CT, o primeiro foi responsável por mais de 75% das capturas em abundância e biomassa. Foram observadas diferenças na composição das espécies, porém os trechos apresentaram similaridade ictiofaunística média (Jaccard = 0,73 e Morisita-Horn = 0,43). Não foram encontradas grandes diferenças com relação aos demais índices ecológicos, porém, o TR apresentou menor diversidade e riqueza de espécies e maior dominância. Assim reforçamos a idéia de que os sistemas de tanques-rede exercem forte atratividade sobre os peixes, causando agregações ao seu redor, resultando em re-estruturação da ictiofauna, pois favorecem as espécies oportunistas que se ajustam mais facilmente às novas condições resultantes das atividades deste empreendimento... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Fish farming in cages or net pens began more than 50 years in the Mekong Delta. Currently, this type of cultivation is expanding in the Brazilian reservoirs having as a model the non-native specie nile-tilapia (Oreochormios niloticus) However it's impacts on the fish fauna are poorly known. The present study seeks to defining the structure and composition of fish assemblages aggregated to that system and and its stretch control and, based on ecological attributes identify potential impacts caused by fish farming system on the on the resident fish fauna existing at the chavantes damo In order to attend that purpose it was used gill nets to collect samples in October and December of 2007 from the area where the net-pens would be installed (pre-tank) and from April of 2008 through March of 2009 (post-tank) around the cages (TR) and from a control section (CT) not influenced by the fish farming system. As a result, differences concerning species' composition and average catch in abundance and biomass were found between the pre-TR and TR periods. Comparing to the CT strecht, the TR stretch presented more than 75% of the catch in number of biomass. Differences relating to the species compositions were also found. However the stretchs presented similar average of fish fauna (Jaccard = 0.73 and Morisita-Horn = 0.43). There was no major difference concerning other ecological index, however, TR had lower diversity and species richness and higher dominance. Hence, it is reinforced the idea that systems of cages exert a strong attraction for fish, causing aggregations around the cages, resulting in restructuring of the fish fauna, for they benefit those opportunistic species witch adjust more easily to the new conditions caused by that kind cultivation. Yet, one must pay attention to the issues of non-native species that can cause significant impacts. Since this study was accomplished during... (Complete abstract click electronic access below) / Mestre

Philosophiae Doctor - PhD / The current study framed as Social Structuring of Language and the Mobility of Semiotic Resources across the Linguistic Landscapesof Zambia: A Multimodal Analysis, is situated in Lusaka and Livingstone and their selected surrounding peri-urban and rural spaces (of Kabanana, Bauleni and Chipata; Kafue, Chongwe, Chief Mukuni’s area and stretches between Livingstoneand Zimba and Livingstone and Kazungula). The study aims to explore the linguistic landscapes (LL) of these urban, peri-urban and rural spaces in order to gain insight into the social structuring of language and the mobility of semiotic resources across the LL. This entails an understanding of how languages are distributed and realized across the research sites. In particular, the study aims at understanding how the regionalization of languages is (re-)produced, contested and maintained in (and beyond) the territories for which they are promulgated for use. Thus, the study foregrounds the mobility of the semiotic resources across the LL. In essence, artefactual material, symbols including languages are, in a multimodal fashion, investigated to see their pliability and mobility from context to context. In the light of the mobility of the semiotic resources, the study privileges both translocal and transnational mobility as the force behind the movement and the dispersal of the semiotic material across ethnolinguistic, formal, informal, urban and rural boundaries. This meant understanding the kind of signs in both urban and rural areas and why they are emplaced in the broader context of sign/place-and meaning making. In order to achieve the aim and objectives, the study has been foregrounded in ethnographic research paradigm in which walk, gaze, talk (interview) and photography were of irreplaceable importance. The conflation of walk, gaze (observation), talk and photography in one investigation avails much. Firstly, the walk brought the researcher within the allowable observation range in order to gain an insider impression while, at the same time, maintaining the objectivity required for an unbiased analysis. Participant observation coupled with gaze offered the required positioning for carrying out a multimodal analysis especially in the rural areas which turned out to have the paucity of signage. Thus, by being a participant observer, I keenly observed how sign-and meaning making were accomplished in oral-dominant communities. This meant positioning oneself as a new comer needing direction. It was in such moments when practices of sign-and meaning making were observed and recorded. For example, I would ask: how do I get to the next village/school/headman? The reference to ecological features such as trees, hills and streams extended the taxonomy of signs available for use in rural areas. Interviews with business owners about the emplaced signs brought to the fore the hidden narratives often gushing out from individualized orientation and personal experiences, as well as the shared sociocultural knowledge and histories of both the producer and consumers of the multimodal LL. Photography yielded digital images forming not only the quantitative data but also the qualitative one upon which a multimodal analysis was done. The aim was to capture over 1500 of images which were to be processed by the Software Package of the Social Sciences (SPSS). Over 1500 images were collected but only 1157 were coded based on the languages present, materiality, inscription, and emplacement. The quantitative data arising from this exercise provided insight into the social structuring of language and mobility of the semiotic resources across the urban, peri-urban and rural spaces. These results were later compared with the national census reports. The analysis of images as qualitative data availed much about the multimodal nature of the signage in place. The analysis of the qualitative data was accomplished by multimodality in its evolve form. Kress and Van Leeuwen’s(2006) Grammar of Visual Design, Scollon and Sollon’s (2003) Geosemiotics, and theoretical concepts such as resemiotization, remediation, recontextualization, decontextualization, multivocality and metamorphosis provided a sound theoretical toolkit to analyse the multimodal/multisemiotic signage emplaced across the public spaces of the research sites. As a result of a robust methodology and theoretical base, the study was able to underpin the social structuring of language and the mobility of semiotic resources across the linguistic landscapes in a manner too apparent. First, apart from showing the linguistic heterogeneity of the research sites, the study shows that social structuring of languages being experienced is one that is predicated on predictability, flexibility, flux and indeterminacy. The results showing the social structuring of English, for example, demonstrate the uneven spread of English across the urban, peri-urban and rural spaces. In particular, the results go against the normative expectation that the urbanized centres of Lusaka and Livingstone would have more signs in English. Peri-urban (Kabanana) and rural (Chongwe/Kafue) spaces showed more signs in English. This suggests a disembodiment of language and locality as well as social actors. Moreover, the results showed the co-occupancy of English and local languages in one micro-space/time. This entails the blurring of boundaries between languages of different socio-political statuses. The bilingualsigns on which English and non-regional languages occur demonstrate the persistent percolation of minor languages onto the LL. The presence of regional languages, albeit differentially, in and beyond their regions for which they were promulgated reminds us that there is a counter hegemonic narrative going on in the LL of the research sites –in defiance of regionalization (zoning). Thus, the results show that languages in the research sites do not stay put where they are officially put by legislation. The conflation of multiple semiotic resources has further (re-)produced linguistic coinages resulting in what I refer to as a sociolinguistics of amalgamation predicated on hybridity, fusion and tr ans languaging. This evidence is framed within the trans local and transnational mobility where both the social actors and the semiotic resources are constantly in circulation. The study observes that mobility is not only restricted to local circulation of cultural materialities from urban to rural and rural to urban,but also a more transnational circulation of semiotic resources. For example, the ubiquitous spread of Chinese signage across the urban, peri-urban and rural LL accentuates the permeating effect of translocal and transnational mobility, leading to the de-territorialization of spaces. The study further shows the sociocultural narratives in place-and meaning making. Place and meaning making as an agentive act is premised on shared sociocultural knowledge and histories (Kress 2010), but is further exploited and extended by creatively drawing on individualized orientation, experiences and subjective sensibilities. In this regard, the study agrees with Hult (2009) that in order to glean the subjective narrations and re-imagining of space embedded in the emplaced signs, interviews with the owners of the emplaced signs is in dispensible. Thus, like Blommaert (2012) aptly suggests, spaces are semiotized as themed spaces. The study has shown how spaces are Christianized, moralized, gendered and anonymized, thus, gaining insight into the forces and meanings behind both the emplacement of and emplaced signs. Further, the reading of artefacts in Livingstone Museum shows how the juxtaposition of the material culture of multilingualism and multiculturalism is a semiotic strategy to double-articulate multiple localities simultaneously: local and global; familiar and unfamiliar; modern and tradition. The transaction of multi vocality in a single moment of emplacement and gaze transforms space dramatically and extends the meaning potential of the emplaced signage in micro-space/time. Further, the observable paucity of signs in rural areas forces us to defer to an ecological approach in which oral language mediation, recycling and repurposing of material affordances provide a comprehensive account of the signage and sign-making/consumption in place. form. Kress and Van Leeuwen’s(2006) Grammar of Visual Design, Scollon and Sollon’s (2003) Geosemiotics, and theoretical concepts such as resemiotization, remediation, recontextualization, decontextualization, multivocality and metamorphosis provided a sound theoretical toolkit to analyse the multimodal/multisemiotic signage emplaced across the public spaces of the research sites. As a result of a robust methodology and theoretical base, the study was able to underpin the social structuring of language and the mobility of semiotic resources across the linguistic landscapes in a manner too apparent. First, apart from showing the linguistic heterogeneity of the research sites, the study shows that social structuring of languages being experienced isone that is predicated on unpredictability, flexibility, flux and indeterminacy. The results showing the social structuring of English, for example, demonstrate the uneven spread of English across the urban, peri-urban and rural spaces. In particular, theresults go against the normative expectation that the urbanized centres of Lusaka and Livingstone would have more signs in English. Peri-urban (Kabanana) and rural (Chongwe/Kafue) spaces showed more signs in English. This suggests a disembodiment of language and locality as well as social actors. Moreover, the results showed the co-occupancy of English and local languages in one micro-space/time. This entails the blurring of boundaries between languages of different socio-political statuses. The bilingualsigns on which English and non-regional languages occur demonstrate the persistent percolation of minor languages onto the LL. The presence of regional languages, albeit differentially, in and beyond their regions for which they were promulgated reminds us that there is a counter hegemonic narrative going on in the LL of the research sites –in defiance of regionalization (zoning). Thus, the results show that languages in the research sites do not stay put where they are officially put by legislation. The conflation of multiple semiotic resources has further (re-)produced linguistic coinages resulting in what I refer to as a sociolinguistics of amalgamation predicated on hybridity, fusion and translanguaging. This evidence is framed within the translocal and transnational mobility where both the social actors and the semiotic resources are constantly in circulation. The study observes that mobility is not only restricted to local circulation of cultural materialities from urban to rural and rural to urban,but also a more transnational circulation of semiotic resources. For example, the ubiquitous spread of Chinese signage across the urban, peri-urban and rural LL accentuates the permeating effect of translocal and transnational mobility, leading to the de-territorialization of spaces. The study further shows the sociocultural narratives in place-and meaning making. Place and meaning making as an agentive act is premised on shared sociocultural knowledge and histories (Kress 2010), but is further exploited and extended by creatively drawing on individualized orientation, experiences and subjective sensibilities. In this regard, the study agrees with Hult (2009) that in order to glean the subjective narrations and re-imagining of space embedded in the emplaced signs, interviews with the owners of the emplaced signs is indispensible. Thus, like Blommaert (2012) aptly suggests, spaces are semiotized as themed spaces. The study has shown how spaces are Christianized, moralized, gendered and anonymized, thus, gaining insight into the forces and meanings behind both the emplacement of and emplaced signs. Further, the reading of artefacts in Livingstone Museum shows how the juxtaposition of the material culture of multilingualism and multiculturalism is a semiotic strategy to double-articulate multiple localities simultaneously: local and global; familiar and unfamiliar; modern and tradition. The transaction of multivocality in a single moment of emplacement and gaze transforms space dramatically and extends the meaning potential of the emplaced signage in micro-space/time. Further, the observable paucity of signs in rural areas forces us to defer to an ecological approach in which oral language mediation, recycling and repurposing of material affordances provide a comprehensive account of the signage and sign-making/consumption in place.

This article seeks to enhance multi criteria decision making by providing a scientic approach for decomposing and structuring decision problems. We propose a process, based on concept mapping, which integrates group creativity techniques, card sorting procedures, quantitative data analysis and algorithmic automatization to construct meaningful and complete hierarchies of criteria. The algorithmic aspect is covered by a newly proposed recursive cluster algorithm, which automatically generates hierarchies from card sorting data. Based on comparison with another basic algorithm and empirical engineered and real-case test data, we validate that our process efficiently produces reasonable hierarchies of descriptive elements like goal- or problem-criteria. (authors' abstract)

Savo tyrime siekėme patikrinti sprendimo priėmimo grupėje struktūros modelį, kuris padėtų pagerinti sprendimų priėmimo grupėje proceso kokybę bei sprendimo priimtinumą grupės nariams. Siūlomas sprendimų priėmimo grupėje struktūros modelis remiasi procedūrinio racionalumo principais (Simon, 2003), Galotti (2002) siūlomu individualaus sprendimo struktūravimo modeliu bei multiatributinės naudos teorija. Sprendimo priėmimo proceso kokybę matavome atsižvelgdami į Deal ir Stroebe (1987, cit. pgl. Furnham) išskirtus trūkumus, būdingus sprendimų priėmimui grupėje, t.y. socialinio dykinėjimo efektą, vertinimo baimę bei produktyvumo blokavimo efektą. Tyrimo metu nustatėme, kad: • Tiriamiesiems, kurie priimdami sprendimą taikė struktūros modelį, priimtas sprendimas priimtinesnis nei tiems, kurie šio modelio netaikė. • Tiriamieji, kurie priimdami sprendimą grupėje taikė struktūros modelį, buvo labiau linkę bendradarbiauti nei tie, kurie šio modelio netaikė. • Bendra sprendimo priėmimo grupėje kokybė, lyginat struktūruoto ir nestruktūruoto sprendimų priėmimo grupes, nesiskyrė. / In this paper we wanted to offer such group decision making structure, which could improve the decision making process quality and decision acceptance. The structured decision making is based upon procedural rationality principles (Simon, 2003), Galotti (2002) individual decision structuring and Multi-attribute utility theory. In decision making process quality assessment we paid attention to presence of social loafing, evaluation apprehension and production blocking effects. Results of this study shows, that: • There is a significant difference in decision acceptance between structured and unstructured decision making groups. • There is no significant difference in total decision making process quality between structured and unstructured decision making groups. • There is a significant difference in cooperation activity between structured and unstructured decision making.