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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The Laphriine robber flies of North America /

Bromley, Stanley Willard, January 1934 (has links)
Thesis (Ph. D.)--Ohio State University, 1934. / Vita. Includes bibliographical references (leaves 332-336). Available online via OhioLINK's ETD Center
2

The Asilidae (Diptera) of Chile /

Artigas, Jorge N. January 1968 (has links)
No description available.
3

Margaret Atwood’s Divided Self

Moss, Kate 19 July 2011 (has links)
―Margaret Atwood‘s Divided Self‖ explores four novels by celebrated Canadian author, Margaret Atwood: Lady Oracle, Surfacing, Alias Grace, and The Robber Bride. Although others have discussed the reoccurring themes of disunity and duality in Atwood‘s work, these explorations have not addressed some of her newest novels and have taken a very limited approach to reading and understanding Atwood‘s theme of the divided self. This study opens up a literary ―conversation‖ about Atwood‘s theme of the divided self by examining the protagonists of these select novels by using different branches of theory and thought to fully explore this issue. To conquer their double or multiple identities Atwood‘s protagonists in these novels must take two actions: 1) Accept their double/multiple identities as a part of themselves and 2) transcend this position and the resulting ―hauntings‖ by their mothers (or their decision to choose a replacement female ―mother‖ figure) by becoming mothers themselves. The introduction chapter ―The Author as ‗Slippery Double‘‖ explores Atwood‘s position as a ―slippery (divided) subject‖ between her writing/social and interior selves. Chapter one, ―Canadian Women: Nature, Place, and the Divided Other in Atwood‘s Works‖ explores the role of nature, place, and femininity in Atwood‘s divided protagonists. Chapter two, ―The Uncanny Double: Haunting Entities and the Divided Self in Atwood‘s Fiction‖ contains the main argument and explores the role of the uncanny in Atwood‘s works. Although I explore these four novels most thoroughly explored, this theme runs throughout Atwood‘s entire body of work. Although I mostly use close readings of the primary texts, I also ground my argument in the work of theorists in several fields of thought including Sigmund Freud, Louis Althusser, George H. Mead, and Jacques Lacan.
4

Conspicuous Giving

Anderson, Lindsay Alexandria 2011 May 1900 (has links)
When discussing charity, it is important to recognize that charity and other forms of giving are not solely done out of altruism, but can also be done out of greed and self promotion. It is especially important to recognize when those in power or those who have fame participate in this form of giving, because their actions may be emulated by others. This self aggrandizing giving has been done historically throughout multiple cultures as a way to gain or keep prestige, and also as a way to keep the boundaries between the classes strong. This is an important idea because, as I argue, giving as a way to gain public recognition and to keep social boundaries in place is still occurring today. This form of giving is what I label Conspicuous Charity. This is giving in which the main focuses of the participation in charity are the public and social benefits (such as prestige and recognition) to the givers, whereas the assistance to those in need is but a secondary benefit. The conspicuous use of charity also can take a broader approach, which I label Conspicuous Giving. This form of giving is presently being used as a way to keep those with fame, such as media celebrities, in the limelight, those with high standing in the global hierarchy at the top, and those at the top of the racial hierarchy separated from those at the bottom. In order to flesh out the concept of Conspicuous Giving, other forms of giving are also discussed such as Christmas gifts, bribes, and feasting. These cultural events are discussed within the context of multiple cultures as ways to show that using giving in a predatory manner is not a phenomenon unique to Western or even American culture. However, I argue that when it comes to this behavior, Americans are at the forefront of this movement into postmodernity.
5

Zombies and Survivors

Faubert, Joël 22 September 2020 (has links)
Cops and Robbers on Graphs (C & R) is a vertex-to-vertex pursuit game played on graphs first introduced by Quilliot (in 1978) and Nowakowski (in 1983). The cop player starts the game by choosing a set of vertices which will be the cops’ starting positions. The robber player responds by choosing its own start vertex. On each player’s turn, the player may move its tokens to adjacent vertices. The cops win if the robber is captured (they occupy the same vertex). The robber wins if it can avoid capture indefinitely. The question, then, is to determine the smallest number of cops required to guarantee the robber will be captured. A variation of C & R called Zombies and Survivors (Z & S) was recently proposed and studied by Fitzpatrick. Z & S is the same as C & R with the added twist that the zombies are required to move closer to the survivor (by following a shortest path from the zombie to the survivor). Whenever multiple shortest paths exist, the zombies are free to choose which one to follow. As in C & R, we are interested in the minimum number of zombies required to guarantee the survivor will be caught. Chapter 1 summarizes important results in vertex-pursuit games. In Chapter 2 we give an example of a planar graph where 3 zombies always lose, whereas Aigner and Fromme showed in 1984 that three cops have a winning strategy on planar graphs. In Chapter 3 we show how two zombies can win on a cycle with one chord.
6

Kombinatorické hry / Combinatorial Games Theory

Valla, Tomáš January 2012 (has links)
Title: Combinatorial Games Theory Author: Tomáš Valla Department / Institute: IUUK MFF UK Supervisor: Prof. RNDr. Jaroslav Nešetřil, DrSc., IUUK MFF UK Abstract: In this thesis we study the complexity that appears when we consider the competitive version of a certain environment or process, using mainly the tools of al- gorithmic game theory, complexity theory, and others. For example, in the Internet environment, one cannot apply any classical graph algorithm on the graph of connected computers, because it usually requires existence of a central authority, that manipu- lates with the graph. We describe a local and distributed game, that in a competitive environment without a central authority simulates the computation of the weighted vertex cover, together with generalisation to hitting set and submodular weight func- tion. We prove that this game always has a Nash equilibrium and each equilibrium yields the same approximation of optimal cover, that is achieved by the best known ap- proximation algorithms. More precisely, the Price of Anarchy of our game is the same as the best known approximation ratio for this problem. All previous results in this field do not have the Price of Anarchy bounded by a constant. Moreover, we include the results in two more fields, related to the complexity of competitive...
7

Parasitas de interações e a coevolução de mutualismos / Interaction parasites and the coevolution of mutualisms

Marquitti, Flávia Maria Darcie 21 August 2015 (has links)
Mutualismos são interações em que os parceiros se exploram reciprocamente com benefícios líquidos para ambos os indivíduos que interagem. Sistemas mutualistas multiespecíficos podem ser descritos como redes de interação, tais como aquelas formadas por sistemas de polinização, dispersão de sementes, estações de limpeza em ambientes recifais, formigas defensoras de plantas, mimetismo mülleriano e bactérias fixadoras de nitrogênio em raízes de plantas. As interações mutualísticas estão sujeitas à trapaça por indivíduos que, por meio de algum comportamento, alcançam o benefício oferecido pelo parceiro sem oferecer nada ou oferecer muito pouco em troca. No entanto, interações mutualísticas persistem apesar da existência de trapaceiros. Neste trabalho, mostro que os parasitas de interações mutualísticas, os trapaceiros, aumentam a resiliência das redes mutualísticas às perturbações mais rapidamente em redes aninhadas, redes tipicamente encontradas em mutualismos ricos em espécies. Portanto os efeitos combinados de trapaceiros, estrutura e dinâmica das redes mutualísticas podem ter implicações para a forma como a biodiversidade é mantida. Em seguida, estudo as condições em que flores tubulares, que sofrem maiores danos ao interagirem com ladrões de néctar, conseguem coexistir com flores planares, polinizadores e pilhadores por meio de efeitos indiretos da trapaça em seu sucesso reprodutivo. O roubo do néctar pode aumentar o sucesso de uma planta se as interações com pilhadores gerarem maior quantidade de polinização cruzada, aumentando assim o sucesso reprodutivo das plantas que interagem com ambos os visitantes florais. Tal resultado sugere uma nova fonte de manutenção da cooperação e da diversidade de estratégias por meio de efeitos não lineares das interações entre diferentes estratégias. Finalmente, estudo como as interações locais promovem a prevalência de mímicos (trapaceiros) em uma certa população na ausência de seus modelos. Mostro que presas que interagem localmente podem favorecer a predominância de mímicos e predadores que os evitam após algumas gerações e que uma distribuição não aleatória de indivíduos no espaço pode reforçar ainda mais este efeito inesperado de alopatria de modelo e mímico / Mutualisms are interactions in which organisms of different species exploit each other with net benefits for both interacting individuals. Multispecific mutualistic system can be depicted as interaction networks, such as those formed by plant-pollinator interactions, dispersal systems, species interacting in cleaning stations in reef environments, protective ants in plants, müllerian mimicry, and nitrogen fixing bacteria on the roots of plants. Mutualistic interaction is subject to cheating by individuals who, by means of a diversity of behavioral strategies, achieve the benefit provided by the partner offering nothing or few in return. However, the mutualistic interactions persist despite the existence of cheaters. In this work I show that the parasites of mutualistic interactions increase the resilience of mutualistic networks to disturbances in nested networks, typically found in species-rich mutualisms. Therefore the joint effect of cheating, structure and dynamics of mutualistic networks have implications for how biodiversity is maintained. I subsequently study the conditions under which tubular flowers, which suffer stronger damages when interacting with nectar robbers, can coexist with planar flowers, pollinators, and robbers through indirect effects of cheating on their reproductive success. The theft of nectar may increase the success of a plant if its interactions with robbers generate higher degrees of cross-pollination, thus increasing the reproductive success of plants that interact with both floral visitors. This study suggests a new source of continued cooperation and diversity strategies through non-linear effects of the interactions between different strategies. Finally, I study how local interactions can promote the prevalence of mimic (the cheaters) in a given population in the absence of their models. I found that prey interacting locally may favor the predominance of mimic preys and avoid predators that, after a few generations and under a non-random distribution of individuals in space, can further strengthen this unexpected effect allopatry of the mimic and its model
8

Contextualizing a motif : late nineteenth century portrayals of the German poacher-hero

Plummer, Jessica Ellen 11 July 2011 (has links)
This thesis focuses on the anachronistic poacher-hero figure in late nineteenth-century German literature. Historian Hobsbawm has suggested that the symbolic endurance of "noble robber" figures (of which we can view poacher-heroes as a subset) takes place in an ideal imaginary "stripped" of the "local and social framework" (2000, 143). My thesis shows, in multiple examples across multiple genres, that in fact the poacher-hero is uniquely available for re-contextualization and renewal of social relevance, even under changed social and economic circumstances. The poacher-hero is not only a device for making statements about the past, but also for expressing claims on the future. It is perhaps this dynamism that makes the poacher-hero excellent carrier for different kinds of social critique as well. In my first chapter, I give a brief historical overview of the period and the motif. In the second chapter, I show how the poacher and his rural context are brought into contact with urban, imperial themes. In the chapter I read two novels, Der verlorene Sohn (The prodigal son, 1884-1886) and Quitt (Even, 1890), and the play Waldleute (Forest people, 1896) thematically to show how upward social mobility is associated with and adapted to the poacher figure. In the third chapter of the thesis, I examine narrative strategies and their employment in the construction of a socially critical viewpoint in Der verlorene Sohn and Quitt. I show how both high and low literary works, intended and written for different audiences, achieve similar results in their positioning of the poacher-protagonist through different narrative structures. This convergence shows the malleability of the societal frame for the poacher-hero. Finally, in the fourth chapter, I show regional adaptations of the motif, by examining different versions of a folk ballad "Das Jennerweinlied" ("The Jennerwein song"). This thesis furthermore shows how study of a motif can be used to bring together a diverse group of roughly contemporary texts. Viewing these texts in relationship with one another brings into question the scholarly focus on certain texts at the expense of others. / text
9

Parasitas de interações e a coevolução de mutualismos / Interaction parasites and the coevolution of mutualisms

Flávia Maria Darcie Marquitti 21 August 2015 (has links)
Mutualismos são interações em que os parceiros se exploram reciprocamente com benefícios líquidos para ambos os indivíduos que interagem. Sistemas mutualistas multiespecíficos podem ser descritos como redes de interação, tais como aquelas formadas por sistemas de polinização, dispersão de sementes, estações de limpeza em ambientes recifais, formigas defensoras de plantas, mimetismo mülleriano e bactérias fixadoras de nitrogênio em raízes de plantas. As interações mutualísticas estão sujeitas à trapaça por indivíduos que, por meio de algum comportamento, alcançam o benefício oferecido pelo parceiro sem oferecer nada ou oferecer muito pouco em troca. No entanto, interações mutualísticas persistem apesar da existência de trapaceiros. Neste trabalho, mostro que os parasitas de interações mutualísticas, os trapaceiros, aumentam a resiliência das redes mutualísticas às perturbações mais rapidamente em redes aninhadas, redes tipicamente encontradas em mutualismos ricos em espécies. Portanto os efeitos combinados de trapaceiros, estrutura e dinâmica das redes mutualísticas podem ter implicações para a forma como a biodiversidade é mantida. Em seguida, estudo as condições em que flores tubulares, que sofrem maiores danos ao interagirem com ladrões de néctar, conseguem coexistir com flores planares, polinizadores e pilhadores por meio de efeitos indiretos da trapaça em seu sucesso reprodutivo. O roubo do néctar pode aumentar o sucesso de uma planta se as interações com pilhadores gerarem maior quantidade de polinização cruzada, aumentando assim o sucesso reprodutivo das plantas que interagem com ambos os visitantes florais. Tal resultado sugere uma nova fonte de manutenção da cooperação e da diversidade de estratégias por meio de efeitos não lineares das interações entre diferentes estratégias. Finalmente, estudo como as interações locais promovem a prevalência de mímicos (trapaceiros) em uma certa população na ausência de seus modelos. Mostro que presas que interagem localmente podem favorecer a predominância de mímicos e predadores que os evitam após algumas gerações e que uma distribuição não aleatória de indivíduos no espaço pode reforçar ainda mais este efeito inesperado de alopatria de modelo e mímico / Mutualisms are interactions in which organisms of different species exploit each other with net benefits for both interacting individuals. Multispecific mutualistic system can be depicted as interaction networks, such as those formed by plant-pollinator interactions, dispersal systems, species interacting in cleaning stations in reef environments, protective ants in plants, müllerian mimicry, and nitrogen fixing bacteria on the roots of plants. Mutualistic interaction is subject to cheating by individuals who, by means of a diversity of behavioral strategies, achieve the benefit provided by the partner offering nothing or few in return. However, the mutualistic interactions persist despite the existence of cheaters. In this work I show that the parasites of mutualistic interactions increase the resilience of mutualistic networks to disturbances in nested networks, typically found in species-rich mutualisms. Therefore the joint effect of cheating, structure and dynamics of mutualistic networks have implications for how biodiversity is maintained. I subsequently study the conditions under which tubular flowers, which suffer stronger damages when interacting with nectar robbers, can coexist with planar flowers, pollinators, and robbers through indirect effects of cheating on their reproductive success. The theft of nectar may increase the success of a plant if its interactions with robbers generate higher degrees of cross-pollination, thus increasing the reproductive success of plants that interact with both floral visitors. This study suggests a new source of continued cooperation and diversity strategies through non-linear effects of the interactions between different strategies. Finally, I study how local interactions can promote the prevalence of mimic (the cheaters) in a given population in the absence of their models. I found that prey interacting locally may favor the predominance of mimic preys and avoid predators that, after a few generations and under a non-random distribution of individuals in space, can further strengthen this unexpected effect allopatry of the mimic and its model
10

Modus operandi van die bankrower : 'n kriminologiese introspeksie

Maree, Alice 11 1900 (has links)
Text in Afrikaans / In die ondersoek na die modus operandi van die bankrower: 'n kriminologiese introspeksie, kan die ondergemelde drie dimensies onderskei word: Die eerste dimensie is 'n kriminologiese introspeksie wat die betekenis wat bankrowers self aan die uitvoer van bankrooftogte heg, behels. Hierdie leefwereld van die subjekte word deur die navorser "betree" en mede-verken. Doelgerigtheid, morele oorwegings, teesin in geweld, charisma, kognitiewe vermoens en 'n materialistiese ingesteldheid is begrippe wat die bankrower as mens belig. Die tweede dimensie word verteenwoordig deur die begrondingsteorie as navorsingsmetode, gebaseer op die werk van Strauss en Corbin {1990), wat toegepas word ten einde sodanige navorsingsdoelstelling te fasiliteer. Tydens die aanvanklike fase van die ondersoek is daar met 28 bankrowers in aanhoud i ng, gefokusde semi -gest ruktureerde ind i epte-onderhoude gevoer. Opvolgonderhoude is met ses van die 28 subjekte gevoer, met die doel om 'n substantiewe begrondingsteorie te ontplooi, verskille op te klaar en die geldigheid van die data te verhoog. Die derde dimensie reflekteer vervolgens die ontplooiing van 'n substantiewe begrondingsteorie wat weerspieel word in proposisies en wat in vier fases van die modus operandi van die bankrower onderskei word, naamlik die beplanning-; uitvoering-; afhandeling-; en heroorwegingsfase. Elk van die ge'identifiseerde fases word gekenmerk deur progressiewe beweging, natuurlike kontinu'iteit, emosionele belewenisse en 'n individualistiese inslag. Twee kernelemente, naamlik besluitneming en rasionaliteit staan prominent binne die kader van die modus operandi van die bankrower. Die substantiewe begrondingsteorie is daarop ingestel om die verskynsel wat bestudeer word, te verklaar. Seide die oorweging van die ondersoek asook ander doelstellings van die navorser word binne die teorie geakkommodeer. Verdere vergelykende studies kan daartoe bydra om die substantiewe begrondingsteorie te verfyn, te falsifiseer, 6f by gebrek daaraan, tot 'n formele teorie uit te bou. Derhalwe word die begrondingsteorie as navorsingsmetode nie slegs as toepaslik beskou vir toekomstige navorsing oor onderwerpe waaroor daar 'n gebrek aan empiriese bevindinge bestaan en waaroor relatief min kennis in kriminologiese literatuur voorkom nie, maar hou dit ook die voordeel van 'n pluriforme navorsingstudie in. / In the investigation into the modus operandi of the bank robber: a criminological introspection, three dimensions can be distinguished. The first dimension is a criminological introspection comprising the meaning attached by bank rob.bers to the execution of bank robberies. This world of the subjects is entered and co-scouted. Sense of purpose, mora 1 considerations, aversion to violence, charisma, cognitive powers and a materialistic disposition are conceptions that elucidate the bank robber as a human. The second dimension is represented by the grounded theory as research method, based on the work of Strauss and Corbin (1990), which are applied to facilitate such research aims. During the initial phase of the investigation, focused, semi-structured, in-depth interviews were held with 28 bank robbers in detention. Subsequent interviews were held with six of the 28 subjects, aimed at expanding a substantive grounded theory, to clear up differences and to increase the validity of the data. The third dimension reflects the development of a substantive grounded theory which is revealed in propositions and signalised in four phases of the bank robber's modus operandi, namely the planning, execution, disposal and reconsideration phases. Each of these identified phases is characterised by progressive movement, natura 1 continuity, emot i ona 1 experiences and an individualistic infusion. The basic elements, namely decision-making and rationalisation, are prominent in the cadre of the bank robber's modus operandi. The substantive grounded theory is aimed at explaining the study phenomenon. Consideration of the investigation as well as other aims of the researcher are accommodated in the theory. Further comparative studies can assist in refining or falsifying the substantive grounded theory or, failing, to expand it to a formal theory. The grounded theory is therefore regarded as appropriate for future research on subjects about which there is a lack of empirical findings and relatively little knowledge in criminological literature. The theory offers, in addition, the advantage of a pluriform research study. / Sociology / D. Litt et Phil. (Kriminologie)

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