Nous développons une version homotopique de la théorie de Morita classique en utilisant la notion de monade forte. C'était Anders Kock qui a montré qu'une monade T dans une catégorie monoidale E est forte si et seulement si la monade T est enrichie. Nous montrons que cette correspondance entre force et enrichissement se traduit par un 2-isomorphisme de 2-catégories. Sous certaines conditions sur la monade T, nous montrons que la catégorie homotopique des T-algèbre est équivalente au sens de Quillen à la catégorie homotopique des modules sur le monoïde d'endomorphismes de la T-algèbre T (I) librement engendré par l'unité I de E . Dans le cas particulier où E est la catégorie des Γ-espaces de Segal munie de la structure de modèle stable de Bousfi eld-Friedlander et T est la monade forte associée à une Γ-théorie bien pointée, nous retrouvons un théorème de Stefan Schwede, comme corollaire du théorème homotopique de Morita.

Elektroniese kommunikasie en handel is 'n verskynsel wat eksponensieel toegeneem het oar die laaste dekade saammet die ontwikkeling en uitbreiding van die Internet. Ten einde kompeterend te wees in die internasionale arena is dit belangrik dat Suid-Afrika 'n klimaat skep waarin elektroniese handel kan floreer. Daar bestaan egter die perspesie dat die huidige regsbedeling onvanpas en onvoldoende is om die kwessies wat ontstaan as gevolg van elektroniese handel te kan hanteer. In 1996 het die kommissie van die Verenigde Nasies gemoeid met internasionale handel, UNCITRAL die Mode/wet oor Elektroniese Handel gefinaliseer. Sederdien is die Modelwet opgeneem in wetgewing of het wetgewing be"invloed in verskeie Iande. Een van die onderliggende beginsels waarop die Mode/wet gebaseer is, is "funksionele gelykheid" ten einde met snel veranderende tegnologie tred te hou. Hierdie beginsel behels dat in ons soektog na regsoplosssings, papiergebaseerde oplossings nie netso nageboots moet word nie maar dat daar eerder gestreef word na ekwivalente regsoplossings binne die tegnologies raamwerk. Die Wet op Elektroniese Kommunikasie en Transaksies is die SuidAfrikaanse antwoord op hierdie internasionale verwikkelinge. Die oogmerk van hierdie skripsie is om artikels 11 tot 13, 18 en 19 van die Wet te bestudeer en te vergelyk met die Mode/wet. Verder om te ondersoek tot watter mate die doelwitte van die Groenskrif behaal is en in welke mate die Wet die behoeftes van die breer gemeenskap aanspreek, soos dit blyk uit die kommentaar op die Groenskrif. Die Suid-Afrikaanse benadering is gebaseer op internasionale voorbeelde en afwykings daarvan word ook bespreek. Hoewel die persepsie bestaan dat die Suid-Afrikaanse reg nie toegerus is om die veranderings te kan hanteer nie, is dit meerendeels net 'n persepsie. Suid-Afrika beskik oor 'n inherent aanpasbare gemenereg. In my opinie, sou opskrifstelling in 'n elektroniese omgewing nie 'n probleem geskep het binne die gemenereg nie. Dit blyk dat meer onsekerheid oor die aard van handtekeninge bestaan. Dit is waarskynlik dat gevorderde elektroniese handtekeninge (soos in die Wet bespreek) in ieder geval erken sou word. Die nuwe Suid-Afrikaanse Wet oor elektroniese handel ruim egter enige onsekerheid uit die weg. Die Suid-Afrikaanse Wet maak gebruik van verskeie internasionale bronne maar die UNCITRAL Modelwet dien as vertrekpunt. Daar blyk eenstemmigheid in Amerika, die Europese Unie en Australie te wees dat "funksionele gelykheid" die beste manier is om veranderende tegnologie te hanteer. Die beginsel van "funksionele gelykheid" is die goue draad wat deur nie aileen die UNCITRAL Mode/wet maar ook deur die Suid-Afrikaanse wetgewing geweef is. Die Suid-Afrikaanse wetgewing voeg verskeie beskermingsmeganismes ten einde verbruikers te beskerm teen die gevare van 'gesiglose handel'. Elektroniese skrif word as die ekwivalent van skrif op papier erken. SuidAfrikaanse wetgewing identifiseer die volgende basiese funksies van handtekeninge, naamlik: • Om die persoon te identifiseer; en • Om die persoon se goedkeuring van die inligting te kommunikeer. 'n Addisionele vereiste dat elektroniese handtekeninge so betroubaar as wat gepas was onder die omstandighede moet wees, word bygevoeg. Suid-Afrikaanse wetgewing spreek oak die kwessies van notariele parktyk, oorspronklikes, sertifisering en geregistreerde pas aan. In geheel behoort die bepalings rakende vormvereistes positief ontvang te word in die mark aangesien "funksionele gelykheid" behoorlik geimplementeer word en 'n juiste basis is. / Thesis (LL.M. (Import and Export Law))--Potchefstroom University for Christian Higher Education, 2003

Elektroniese kommunikasie en handel is 'n verskynsel wat eksponensieel toegeneem het oar die laaste dekade saammet die ontwikkeling en uitbreiding van die Internet. Ten einde kompeterend te wees in die internasionale arena is dit belangrik dat Suid-Afrika 'n klimaat skep waarin elektroniese handel kan floreer. Daar bestaan egter die perspesie dat die huidige regsbedeling onvanpas en onvoldoende is om die kwessies wat ontstaan as gevolg van elektroniese handel te kan hanteer. In 1996 het die kommissie van die Verenigde Nasies gemoeid met internasionale handel, UNCITRAL die Mode/wet oor Elektroniese Handel gefinaliseer. Sederdien is die Modelwet opgeneem in wetgewing of het wetgewing be"invloed in verskeie Iande. Een van die onderliggende beginsels waarop die Mode/wet gebaseer is, is "funksionele gelykheid" ten einde met snel veranderende tegnologie tred te hou. Hierdie beginsel behels dat in ons soektog na regsoplosssings, papiergebaseerde oplossings nie netso nageboots moet word nie maar dat daar eerder gestreef word na ekwivalente regsoplossings binne die tegnologies raamwerk. Die Wet op Elektroniese Kommunikasie en Transaksies is die SuidAfrikaanse antwoord op hierdie internasionale verwikkelinge. Die oogmerk van hierdie skripsie is om artikels 11 tot 13, 18 en 19 van die Wet te bestudeer en te vergelyk met die Mode/wet. Verder om te ondersoek tot watter mate die doelwitte van die Groenskrif behaal is en in welke mate die Wet die behoeftes van die breer gemeenskap aanspreek, soos dit blyk uit die kommentaar op die Groenskrif. Die Suid-Afrikaanse benadering is gebaseer op internasionale voorbeelde en afwykings daarvan word ook bespreek. Hoewel die persepsie bestaan dat die Suid-Afrikaanse reg nie toegerus is om die veranderings te kan hanteer nie, is dit meerendeels net 'n persepsie. Suid-Afrika beskik oor 'n inherent aanpasbare gemenereg. In my opinie, sou opskrifstelling in 'n elektroniese omgewing nie 'n probleem geskep het binne die gemenereg nie. Dit blyk dat meer onsekerheid oor die aard van handtekeninge bestaan. Dit is waarskynlik dat gevorderde elektroniese handtekeninge (soos in die Wet bespreek) in ieder geval erken sou word. Die nuwe Suid-Afrikaanse Wet oor elektroniese handel ruim egter enige onsekerheid uit die weg. Die Suid-Afrikaanse Wet maak gebruik van verskeie internasionale bronne maar die UNCITRAL Modelwet dien as vertrekpunt. Daar blyk eenstemmigheid in Amerika, die Europese Unie en Australie te wees dat "funksionele gelykheid" die beste manier is om veranderende tegnologie te hanteer. Die beginsel van "funksionele gelykheid" is die goue draad wat deur nie aileen die UNCITRAL Mode/wet maar ook deur die Suid-Afrikaanse wetgewing geweef is. Die Suid-Afrikaanse wetgewing voeg verskeie beskermingsmeganismes ten einde verbruikers te beskerm teen die gevare van 'gesiglose handel'. Elektroniese skrif word as die ekwivalent van skrif op papier erken. SuidAfrikaanse wetgewing identifiseer die volgende basiese funksies van handtekeninge, naamlik: • Om die persoon te identifiseer; en • Om die persoon se goedkeuring van die inligting te kommunikeer. 'n Addisionele vereiste dat elektroniese handtekeninge so betroubaar as wat gepas was onder die omstandighede moet wees, word bygevoeg. Suid-Afrikaanse wetgewing spreek oak die kwessies van notariele parktyk, oorspronklikes, sertifisering en geregistreerde pas aan. In geheel behoort die bepalings rakende vormvereistes positief ontvang te word in die mark aangesien "funksionele gelykheid" behoorlik geimplementeer word en 'n juiste basis is. / Thesis (LL.M. (Import and Export Law))--Potchefstroom University for Christian Higher Education, 2003

The objectives of this study were to validate the Maslach Burnout Inventory - General Survey (MBI-GS) and the Oldenburg Burnout Inventory (OLBI), to determine the construct equivalence and item bias of these instruments for employees in an earthmoving equipment industry in South &ca of different language groups, to determine the correlation between the MBI-GS and the OLBI, and to investigate the relationship between burnout and various demographic characteristics. A random sample of 326 employees in an earthmoving equipment industry of eight provinces in South Africa was taken. The MBI-GS, the OLBI and a biographical questionnaire were used as measuring instruments. Cronbach alpha coefficients, inter-item correlation coefficients, Pearson product-moment correlation coefficients and exploratory factor analysis were used to analyse the data The results showed that three factors of the MBI-GS and two factors of the OLBI exist for different language groups. Exploratory factor analysis with target rotations confirmed the construct equivalence of the three factors of the MBI-GS and the two factors for the OLBI for different language groups. No evidence was found for uniform or non-uniform bias of the items of the MBI-GS or the OLBI for different language groups. Results indicated that no differences with respect to levels of burnout exist between various demographic characteristics. Recommendations were made for further research. / Thesis (M.Com. (Industrial Psychology))--North-West University, Potchefstroom Campus, 2005.

The mining industry is driven by performance and intense working environments, accompanied by high demands, hazardous working conditions and socially undesirable working hours. These factors could impact on the interaction between work and home, as well as contributing to health problems of employees. The objectives of this research were to test the construct validity, construct equivalence and reliability of a work-home interaction measuring instrument, the Survey Work-Home Interaction - Nijmegen (SWING), to determine if work-home interaction differences exist between different demographical groups, and to test a structural model of job characteristics (job demands and job resources), ill health and negative work-home interference. Random samples (n = 320) were taken from employees working in the mining industry (gold, platinum and phosphate mines) in the Gauteng, North West and Northern provinces. The SWING, a self-developed job characteristics questionnaire and an adapted version of the General Health Questionnaire were administered. Structural equation modelling, descriptive statistics, Cronbach alpha coefficients, Pearson product-moment correlations, multivariate analysis of variance (MANOVA) and one-way analysis of variance (ANOVA) were used to analyse the data. Structural equation modelling confirmed the four-factor structure of the SWING and the construct equivalence for two language and ethnic groups. The four factors showed acceptable internal consistencies. Statistically significant differences were found based on age, ethnicity, gender, qualification, marital and parental status, language, flexibility at work and whether individuals had a partner with a paid job. Regarding the structural model, the results showed that job demands and job resources have an impact on ill health, and that ill health is associated with negative WHI. It was also found that job demands and job resources have a direct relationship with negative WHI on their own, but when both high demands and a lack of resources are present, only an indirect relationship with negative WHI exists though ill health. / Thesis (M.Com. (Industrial Psychology))--North-West University, Potchefstroom Campus, 2007

Les travaux entrepris dans le cadre de la présente thèse portent sur l’analyse de l’équivalence terminologique en corpus parallèle et en corpus comparable. Plus spécifiquement, nous nous intéressons aux corpus de textes spécialisés appartenant au domaine du changement climatique. Une des originalités de cette étude réside dans l’analyse des équivalents de termes simples. Les bases théoriques sur lesquelles nous nous appuyons sont la terminologie textuelle (Bourigault et Slodzian 1999) et l’approche lexico-sémantique (L’Homme 2005). Cette étude poursuit deux objectifs. Le premier est d’effectuer une analyse comparative de l’équivalence dans les deux types de corpus afin de vérifier si l’équivalence terminologique observable dans les corpus parallèles se distingue de celle que l’on trouve dans les corpus comparables. Le deuxième consiste à comparer dans le détail les équivalents associés à un même terme anglais, afin de les décrire et de les répertorier pour en dégager une typologie. L’analyse détaillée des équivalents français de 343 termes anglais est menée à bien grâce à l’exploitation d’outils informatiques (extracteur de termes, aligneur de textes, etc.) et à la mise en place d’une méthodologie rigoureuse divisée en trois parties. La première partie qui est commune aux deux objectifs de la recherche concerne l’élaboration des corpus, la validation des termes anglais et le repérage des équivalents français dans les deux corpus. La deuxième partie décrit les critères sur lesquels nous nous appuyons pour comparer les équivalents des deux types de corpus. La troisième partie met en place la typologie des équivalents associés à un même terme anglais. Les résultats pour le premier objectif montrent que sur les 343 termes anglais analysés, les termes présentant des équivalents critiquables dans les deux corpus sont relativement peu élevés (12), tandis que le nombre de termes présentant des similitudes d’équivalence entre les corpus est très élevé (272 équivalents identiques et 55 équivalents non critiquables). L’analyse comparative décrite dans ce chapitre confirme notre hypothèse selon laquelle la terminologie employée dans les corpus parallèles ne se démarque pas de celle des corpus comparables. Les résultats pour le deuxième objectif montrent que de nombreux termes anglais sont rendus par plusieurs équivalents (70 % des termes analysés). Il est aussi constaté que ce ne sont pas les synonymes qui forment le groupe le plus important des équivalents, mais les quasi-synonymes. En outre, les équivalents appartenant à une autre partie du discours constituent une part importante des équivalents. Ainsi, la typologie élaborée dans cette thèse présente des mécanismes de l’équivalence terminologique peu décrits aussi systématiquement dans les travaux antérieurs. / The research undertaken for this thesis concerns the analysis of terminological equivalence in a parallel corpus and a comparable corpus. More specifically, we focus on specialized texts related to the domain of climate change. A unique aspect of this study is based on the analysis of the equivalents of single word terms. The theoretical frameworks on which we rely are the terminologie textuelle (Bourigault et Slodzian 1999) and the lexico-sémantique approaches (L’Homme 2005). This study has two objectives. The first is to perform a comparative analysis of terminological equivalents in the two types of corpora in order to verify if the equivalents found in the parallel corpus are different from the ones observed in the comparable corpora. The second is to compare in detail equivalents associated with a same English term, in order to describe them and define a typology. A detailed analysis of the French equivalents of 343 English terms is carried out with the help of computer tools (term extractor, text aligner, etc.) and the establishment of a rigorous methodology divided into three parts. The first part, common to both objectives of the research concerns the elaboration of the corpus, the validation of the English terms and the identification of the French equivalents in the two corpora. The second part describes the criteria on which we rely to compare the equivalents of the two types of corpora. The third part sets up the typology of equivalents associated with a same English term. The results for the first objective shows that of the 343 English words analyzed, terms with equivalents that can be criticized in both corpora are relatively low in number (12), while the number of terms with similar equivalences between the two corpora is very high (272 identical and 55 equivalents not objectionable). The analysis described in this chapter confirms our hypothesis that terminology used in parallel corpora does not differ from that used in comparable corpora. The results of the second objective show that many English terms are rendered by several equivalents (70% of analyzed terms). It is also noted that synonyms are not the largest group of equivalents but near-synonyms. Also, equivalents from another part of speech constitute an important part of the equivalents analyzed. Thus, the typology developed in this thesis presents terminological equivalent mechanisms rarely described as systematically in previous work.

本文採用 Grossman and Helpman (1994) 所建立的政治獻金模型為架構，來分析國內外廠商如何透過政治獻金的捐贈，以達到影響政府對於貿易管制政策中關稅或配額政策的偏好，進一步我們可得出關稅與配額等價性成立與否之結論。本文研究發現，首先，在兩國廠商皆無政治獻金遊說的情況下，關稅與配額等價性的命題不會成立。其次，在兩國廠商有政治獻金遊說的情況下，除了一個特例的情形外，本國政府均會偏好採用從量關稅政策，此時，關稅與配額等價性的命題將無法成立。 / This paper applies the original model of Grossman and Helpman (1994) and analyzes how the domestic and foreign firms may influence the incumbent government’s choice of trade policy via political contributions. Besides, we can examine whether the arguments for the equivalence of tariffs and quotas, may in fact hold or not given the political contributions. It is shown that in the case of no campaign contributions, the equivalence of tariffs and quotas will not hold. Furthermore, when the firms in the two countries lobby by political contributions, the domestic government will adopt a tariff policy except some special case. Then the equivalence of tariffs and quotas will not hold.

The term equivalence describes the relationship between a translation and the text from which it is translated. Translation is generally viewed as indeterminate insofar as there is no single acceptable translation - but many. Despite this, the rationalist metaphor of translation equivalence prevails. Rationalist approaches view translation as a process in which an original text is analysed to a level of abstraction, then transferred into a second representation from which a translation is generated. At the deepest level of abstraction, representations for analysis and generation are identical and transfer becomes redundant, while at the surface level it is said that surface textual features are transferred directly. Such approaches do not provide a principled explanation of how or why abstraction takes place in translation. They also fail to resolve the dilemma of specifying the depth of transfer appropriate for a given translation task. By focusing on the translator�s role as mediator of communication, equivalence can be understood as the coordination of information about situations and states of mind. A fundamental opposition is posited between the transfer of rule-like or codifiable aspects of equivalence and those non-codifiable aspects in which salient information is coordinated. The Translation Salience model proposes that Transfer and Salience constitute bipolar extremes of a continuum. The model offers a principled account of the translator�s interlingual attunement to multi-placed coordination, proposing that salient information can be accounted for with three primary notions: markedness, implicitness and localness. Chapter Two develops the Translation Salience model. The model is supported with empirical evidence from published translations of Arabic and English texts. Salience is illustrated in Chapter Three through contextualized interpretations associated with various Arabic communication resources (repetition, code switching, agreement, address in relative clauses, and the disambiguation of presentative structures). Measurability of the model is addressed in Chapter Four with reference to emerging computational techniques. Further research is suggested in connection with theme and focus, text type, cohesion and collocation relations.

Submitted by Ronildo Prado (ronisp@ufscar.br) on 2017-08-17T19:31:04Z No. of bitstreams: 1 TeseSLS.pdf: 1861509 bytes, checksum: 67699187e9b93f72a91ff3376c3d9ed9 (MD5) / Approved for entry into archive by Ronildo Prado (ronisp@ufscar.br) on 2017-08-17T19:31:12Z (GMT) No. of bitstreams: 1 TeseSLS.pdf: 1861509 bytes, checksum: 67699187e9b93f72a91ff3376c3d9ed9 (MD5) / Approved for entry into archive by Ronildo Prado (ronisp@ufscar.br) on 2017-08-17T19:31:18Z (GMT) No. of bitstreams: 1 TeseSLS.pdf: 1861509 bytes, checksum: 67699187e9b93f72a91ff3376c3d9ed9 (MD5) / Made available in DSpace on 2017-08-17T19:31:25Z (GMT). No. of bitstreams: 1 TeseSLS.pdf: 1861509 bytes, checksum: 67699187e9b93f72a91ff3376c3d9ed9 (MD5) Previous issue date: 2017-02-17 / Não recebi financiamento / Questions about the possible influence of marketing on children's food choices have been topics of debate in recent years. The use of characters in advertisements and packaging is one strategy commonly used to develop positive attitudes toward brands or products. Research that used the stimulus equivalence paradigm has shown that such influence can occur through the transfer of functions. The purpose of this thesis was to verify under what conditions an abstract symbol can acquire symbolic functions of characters and influence children's food choices. Therefore, three studies were carried out. In Study 1 of this thesis, the children formed two classes of stimuli: one containing a liked character and the other a dislike character. The other members were geometric figures and abstract symbols. Three choice and preference tests were conducted where the children had to choose from two samples of the same snack, differing only by the label on the package: 1) symbol equivalent to the liked and disliked characters; 2) symbol equivalent to the disliked character and a new symbol; and 3) the symbol equivalent to the liked character and the logo a known brand. Most children chose first, and reported to like more, the snack labeled with the symbol equivalent to the liked character. They also chose, and reported to like more, the snack labeled with a new stimulus over the symbol equivalent to the disliked character. The Test 3 was inconclusive. Study 2 was similar, however, rather than the known brand, this was replaced by another new symbol in the Test 3. The equivalence tests and the food choice and preference tests were repeated after two weeks. The results of Test 1 were replicated, but the tests 2 and 3 were inconclusive. However, it was possible to verify both the maintenance of the equivalence relations and the transfer of function. In Study 3 the children formed three classes of equivalence, one of which contained a neutral figure. The preference tests were similar; however, the “neutral” symbols replaced the new symbols. The function transfer results were even more robust because all children chose and liked more the food with the symbol equivalent to the favorite character on the label. It has also been noted that children tend to choose a food with a symbol equivalent to the character, even if not attractive, when the other option is a label with a "neutral" symbol. The analysis of the profile and consumption habits of private school participants (Studies 1 and 2) and public (Study 3) pointed to some significant differences relative to food consumption, participation in purchases, hours of televisions, etc, which may have influenced in the obtained results. It is considered that the results achieved have empirically demonstrated how children can be persuaded by using attractive figures. They also brought contributions that strengthen the stimulus equivalence paradigm as a behavioral model the semantic relations and an useful methodology for the study of the attitudes and preferences. / Questões referentes à possível influência do marketing nas escolhas alimentares de crianças têm sido temas de debate nos últimos anos. A adoção de personagens em propagandas e embalagens faz parte das estratégias normalmente utilizadas para desenvolver atitudes positivas em relação a marcas ou produtos. Pesquisas que se baseiam no paradigma de equivalência de estímulos têm demonstrado que tal influência pode ocorrer também por meio da transferência de funções. O objetivo desta tese foi verificar em quais condições um símbolo abstrato pode adquirir funções simbólicas de personagens e influenciar escolhas alimentares de crianças. Para tanto, foram realizados três estudos. No Estudo 1 as crianças formaram duas classes de estímulos: uma contendo um personagem de que gostavam e a outra um personagem de que não gostavam. Os demais membros eram figuras geométricas e símbolos abstratos. Foram conduzidos três testes de escolha e preferência com dois alimentos idênticos oferecidos em embalagens transparentes tendo os seguintes rótulos: o símbolo equivalente ao personagem favorito e o outro ao personagem não atrativo; 2) o símbolo equivalente ao personagem não atrativo e um símbolo novo; e 3) o símbolo equivalente ao personagem favorito e o outro uma marca conhecida. Os resultados apontaram que a maioria das crianças escolheu e relatou gostar mais do alimento com um símbolo da mesma classe do personagem de que gostavam. Além disto, o alimento com o símbolo novo no rótulo também foi mais escolhido do que o que continha o símbolo da classe do personagem de que não gostavam. O terceiro teste foi inconclusivo. O Estudo 2 foi semelhante, no entanto, ao invés da marca conhecida no Teste 3, esta foi substituída por um outro símbolo novo. Os testes de equivalência e de escolha e preferência alimentar foram repetidos após duas semanas. Houve replicação dos resultados referentes ao Teste 1, no entanto, os Testes 2 e 3 foram inconclusivos. Foi possível constatar tanto a manutenção das relações de equivalência quanto da transferência de função. No Estudo 3 as crianças formaram três classes de equivalência, sendo que uma delas continha uma figura neutra. Os testes foram semelhantes aos anteriores, no entanto, os símbolos novos foram substituídos pelo símbolo “neutro”. Todas as crianças escolheram e demonstraram preferência pelo alimento com o símbolo equivalente ao personagem favorito no rótulo. Também se pôde constatar que as crianças tendem a escolher um alimento com um símbolo equivalente ao personagem, mesmo que não atrativo, quando a outra opção é um rótulo com um símbolo “neutro”. A análise do perfil e hábitos de consumo dos participantes da escola particular (Estudos 1 e 2) e pública (Estudo 3) apontaram algumas diferenças significativas com relação ao consumo de alimentos, participação em compras, horas de televisão, etc., que podem ter interferido nos resultados obtidos. Considera-se que os resultados alcançados demonstraram empiricamente como as crianças podem ser persuadidas com o uso de figuras atrativas. Também trouxeram contribuições que reforçam a equivalência de estímulos como um modelo de relações semânticas, além de se mostrar uma metodologia útil para o estudo das atitudes e preferências.

Made available in DSpace on 2014-06-11T19:26:56Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-02-27Bitstream added on 2014-06-13T19:47:23Z : No. of bitstreams: 1 costa_ms_me_sjrp.pdf: 783209 bytes, checksum: 73f6e3fc95abaa20d3bd6712cd6ef3b1 (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Neste trabalho estudamos um problema de bifurcação Z2-equivariante de corank dois e com dois parâmetros motivados pela equação de bifurcação que descreve a envergadura de um painel cilíndrico sujeito a uma compressão axial. Nossa abordagem é através da Formulação por Caminhos que considera um problema de bifurcação como o pull-back por um caminho do desdobramento miniversal do cen tro organizador do problema de bifurcação, que é a singularidade obtida anulando-se os parâmetros de bifurcação. Utilizamos técnicas da Teoria de Singularidades sem um grupo explícito de equivalências para os caminhos associados ao problema de bifurcação. Nossos cálculos são puramente algébricos. Mostramos como nossos resultados podem ser aplicados ao estudo da envergadura do painel cilíndrico. / In this work we study a corank two Z2-equivariant bifurcation problem with two parameters that arise as the bifurcation equation of the buckling problem of a cylindrical panel under an axial compressive load. We use the Path Formulation approach that considers a bifurcation problem as the pull-back by a path of the miniversal unfolding of the core of the problem, the singularity obtained by setting the parameters to zero. We apply Singularity Theory without an explicit group of equivalences for the paths de¯ning the bifurcation problem. Our calculations are purely algebraic. We show how our results can be applied to study the buckling of the cylindrical panel.