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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.
351

Sensory discrimination and refuge recognition in amblypygids

Santangelo, Constance Ruth Michaela 04 May 2017 (has links)
No description available.
352

Nocturnal Homing in the Amblypygid Phrynus Marginemaculatus

Graving, Jacob M. 05 November 2015 (has links)
No description available.
353

Systematics and Evolution of the Californian Trapdoor Spider Genus Aptostichus Simon (Araneae: Mygalomorphae: Euctenizidae)

Bond, Jason E. 28 September 1999 (has links)
Chapter One: Raven's 1985 phylogenetic analysis of the Mygalomorphae placed a number of previously unrelated genera into the rastelloid family Cyrtaucheniidae. Although Goloboff's 1993 reanalysis of mygalomorph relationships retained the familial composition of the Rastelloidina it di not support cyrtaucheniid monophyly. This study resolves the issue of cyrtaucheniid monophyly within the context of the Rastelloidina. Using 71 morphological characters scored for 29 mygalomorph taxa we find that the Cyrtaucheniidae is polyphyletic and propose the following families in its place: Cyrtaucheniidae, Kiamidae (new family), Aporoptychidae (new rank), Ancylotrypidae (new family) and Euctenizidae (new rank). We also propose two new euctenizid genera, Apachella and Sinepedica, revise the taxonomy of the euctenizids of the Southwestern United States, and present a key for these six genera. In addition to the morphologically based phylogeny we test and refine the euctenizid intergeneric phylogeny using molecular data (mitochondrial 16S rRNA and COI genes and 28S rRNA nuclear genes). The results of the combined morphological and molecular analysis are used to construct a composite rastelloid phylogeny that is used to investigate biogeographical relationships, burrow entrance evolution, and homoplasy. Chapter Two: This systematic study of the predominately Californian trapdoor spider genus Aptostichus Simon, 1890 describes 28 species, 25 of which are newly described: A. atomus, A. improbulus, A. insulanus, A. icenoglei, A. ebriosus, A. muiri, A. cahuillus, A. luiseni, A. serranos, A. calientus, A. chemehuevi, A. shoshonei, A. pauitei, A. tipai, A. cochesensis, A. indegina, A. gertschi, A. kristenae, A. fornax, A. spinaserratus, A. brevifolius, A. brevispinus, A. agracilapandus, A. tenuis, and A. gracilapandus. Aptostichus stanfordianus Smith, 1908 is considered to be a junior synonym of A. atomarius Simon 1890. Using 72 quantitative and qualitative morphological characters we propose a preliminary phylogeny for this group. Based on the results of this phylogenetic analysis, we recognize the Atomarius, Simus, Hesperus and Pandus species groups. Additionally, our phylogenetic analysis indicates that adaptations favoring the invasion of the very arid desert habitats of southern California have evolved multiple times in the Aptostichus clade. The existence of both desert and non - desert species in three of the four species groups makes this genus an ideal candidate for the study of the evolutionary ecology of desert arthropods. Chapter Three: Aptostichus simus is a trapdoor spider that is endemic to the coastal dunes of southern California and is recognized as a single species on morphological grounds. Mitochondrial DNA 16S rRNA sequences demonstrate that populations from San Diego County, Los Angeles County, Santa Rosa Island, and Monterey County are extremely divergent (6 - 12%). These results are comparable to, or higher than recent reports of species - level differences in other invertebrate taxa. A molecular clock hypothesis shows that these four populations have been separated for 2 - 6 million years. A statistical cluster analysis of morphological features demonstrates that this genetic divergence is not reflected in anatomical features that might signify ecological differentiation among these lineages. The species status of these divergent populations of A. simus depends upon the species concept utilized. The time - limited genealogical perspective that is employed separates A. simus into two genetically distinct species. This study suggests that a species concept based on morphological distinctiveness in spider groups with limited dispersal capabilities probably underestimate taxonomic diversity. / Ph. D.
354

Biological control of the two-spotted spider mite, Tetranychus urticae Koch (Acari : tetranychidae).

Gatarayiha, Mutimura Celestin. January 2009 (has links)
The two-spotted spider mite (TSM), Tetranychus urticae Koch, is an important pest of many greenhouse and field crops worldwide. The development of resistance in TSM populations to chemical acaricides, allied with public health concerns about pesticide residues, has motivated the search for alternative control measures to suppress the pest. Hyphomycetous fungi are promising agents for mite control and the fungus Beauveria bassiana (Bb) (Balsamo) Vuillemin was investigated in this study as a biocontrol agent. The principal objectives of this study comprised: a) screening Bb strains for their pathogenicity against T. urticae; b) testing the effect of adjuvants on the efficacy of Bb; c) studying the effect of plant type on persistence of Bb and the efficacy of control of Bb against T. urticae; d) evaluating the field efficacy of Bb applications against T. urticae; e) testing the compatibility of Bb with selected fungicides; and f) assessing the synergy between Bb and soluble silicon for T. urticae control. Screening bioassays of sixty-two strains of Bb identified the two most effective strains, PPRI 7315 (R289) and PPRI 7861 (R444), that caused mortality levels of more than 80% of adult mites at 9 d post-inoculation with 2 × 108 conidia ml-1. These strains performed significantly better than the Bb commercial strain PPRI 5339, in laboratory bioassays. The two strains also attacked mite eggs, causing 53.4% and 55.5% reduction in egg hatchability at 2 × 108 conidia ml-1 respectively. However, PPRI 7861 showed relatively higher production of conidia in culture and was, therefore, selected for further trials under greenhouse and field conditions. Greenhouse evaluations of the effects of two adjuvants (Break-thru® and a paraffin oil-based emulsion) on efficacy of Bb demonstrated a higher efficacy of the biocontrol agent (BCA) when it was applied with Break-thru® or the oil solution than with water alone. Moreover, Bb conidia applied in Break-thru® solution resulted in greater control of TSM than conidia applied in the mineral oil. There was also a dose-response effect and the control of TSM by Bb increased when the concentration of conidia was increased. The control of TSM by Bb in beans (Phaseolus vulgaris L), cucumber (Cucumis sativus L.), eggplant (Solanum melongena L.), maize (Zea mays L.) and tomato (Solanum lycopersicum L.) was tested in greenhouse trials. On these crops, the persistence of conidia declined over time. The rate of decline was significantly higher on maize. However, TSM mortality was positively correlated with the amount of conidia deposited on leaves immediately after spraying, rather than their persistence over time. Higher levels of mortality of TSM due to Bb application were observed on beans, cucumber and eggplants, suggesting that the type of crop must be taken into consideration when Bb is applied as a BCA. Field efficacy of Bb against mites was evaluated in two trials on eggplants. Based on assessment of population densities of mites and leaf damage assessments; both trials showed that the strain PPRI 7861 controlled TSM in the field. Two commonly used fungicides, azoxystrobin and flutriafol, were investigated in vitro tests on culture medium and laboratory bioassays on detached bean leaves (Phaseolus vulgaris L.) for their effects on Bb. Azoxystrobin (a strobilurin) was less harmful to Bb while flutriafol was found to be inhibitory. Another important finding of this study was the substantial enhancement of Bb efficacy by soluble silicon. When Bb was combined with soluble Si, the control of TSM was better than when either of the two products was applied alone. Moreover, application of soluble Si as a plant fertilizer in hydroponic water nutrient increased accumulation of peroxidase, polyphenoloxidase and phenylalanine ammonia-lyase enzymes in leaves of plants infested with TSM. Increased activity of these defense enzymes in leaves deters feeding behaviour of mites. We suggested that feeding stress renders them susceptible to Bb infection, which would explain the synergy observed between the two agents. / Thesis (Ph.D.)-University of KwaZulu-Natal, Pietermaritzburg, 2009.
355

[en] ALUMNI TOOL: INFORMATION RECOVERY OF PERSONAL DATA ON THE WEB IN AUTHENTICATED SOCIAL NETWORKS / [pt] ALUMNI TOOL: RECUPERAÇÃO DE DADOS PESSOAIS NA WEB EM REDES SOCIAIS AUTENTICADAS

LUIS GUSTAVO ALMEIDA 02 August 2018 (has links)
[pt] O uso de robôs de busca para coletar informações para um determinado contexto sempre foi um problema desafiante e tem crescido substancialmente nos últimos anos. Por exemplo, robôs de busca podem ser utilizados para capturar dados de redes sociais profissionais. Em particular, tais redes permitem estudar as trajetórias profissionais dos egressos de uma universidade, e responder diversas perguntas, como por exemplo: Quanto tempo um ex-aluno da PUC-Rio leva para chegar a um cargo de relevância? No entanto, um problema de natureza comum a este cenário é a impossibilidade de coletar informações devido a sistemas de autenticação, impedindo um robô de busca de acessar determinadas páginas e conteúdos. Esta dissertação aborda uma solução para capturar dados, que contorna o problema de autenticação e automatiza o processo de coleta de dados. A solução proposta coleta dados de perfis de usuários de uma rede social profissional para armazenamento em banco de dados e posterior análise. A dissertação contempla ainda a possibilidade de adicionar diversas outras fontes de dados dando ênfase a uma estrutura de armazém de dados. / [en] The use of search bots to collect information for a given context has grown substantially in recent years. For example, search bots may be used to capture data from professional social networks. In particular, such social networks facilitate studying the professional trajectory of the alumni of a given university, and answer several questions such as: How long does a former student of PUC-Rio take to arrive at a management position? However, a common problem in this scenario is the inability to collect information due to authentication systems, preventing a search robot from accessing certain pages and content. This dissertation addresses a solution to capture data, which circumvents the authentication problem and automates the data collection process. The proposed solution collects data from user profiles for later database storage and analysis. The dissertation also contemplates the possibility of adding several other sources of data giving emphasis to a data warehouse structure.
356

"Power To the People" : le déclin de la figure du superhéros dans les films américains après 2001 / « Power to the People » : The decline of the Superhero Icon in American Films since 9/11

Ducreux, Jean-Guy 26 October 2013 (has links)
L'objectif de cette thèse est de montrer le déclin de la figure du superhéros dans les films américains après le 11 Septembre. Les films de superhéros n?ont jamais été si nombreux. Jamais le moral du superhéros n'a été si bas. Ce paradoxe trouve sa meilleure illustration dans l'image double de Batman relégué au ras du sol, alors que le symbole commercial de la chauve-souris brille au firmament de Gotham City. La marchandise culturelle transcenderait donc un superhéros considérablement amoindri. Ce travail se concentre sur trois domaines en particulier : la perte de masculinité du superhéros à la fin du siècle dernier, qui amène à une confrontation symbolique entre le quarterback et la majorette, ou entre Superman et un hypothétique Everyman, et la réémergence d'un monomythe réactionnaire après 2005 ; les errances d'un Surmoi freudien affaibli, et sa relation fluctuante avec un Ça très séduisant, incarné par le superméchant du vingt-et-unième siècle ; la toile de fond sociopolitique contemporaine hostile aux exploits du superhéros, pour qui l'isothymie fukuyamienne omniprésente constitue une injuste condamnation de son action salvatrice. Icône d'une démocratie libérale qui règne désormais sur notre planète, le superhéros postmoderne semble singulièrement désadapté à la culture qui l'a vu naître. / The main topic of this doctoral thesis is the study of the decline of the superhero icon in American films after 9/11. Superhero productions are at an all-time high, and yet, the superhero's morale is at an all-time low. This paradox is best illustrated with the dual image of Batman stuck at Ground Zero, staring up at the projection of his chevron looming large in the sky of Gotham City. The glowing merchandise transcends an otherwise sullied character. This dissertation focuses on three main realms: the superhero's loss of masculinity at the end of the twentieth century, leading to the formal opposition between the figures of the quarterback and the cheerleader, or between Superman and Everyman, and the reactionary, warpath revival which started in 2005; the travails of the flailing Superego and its shifting relationship to the almighty Id, represented by the twenty-first century glorified supervillain; and, finally, the inimical sociopolitical backdrop for the superhero's prowess, in which Fukuyama's prevalent isothymia eventually denies the superhero his just laurels. The postmodern superhero thus appears as a national misfit, also because this cultural commodity now reaches far beyond the traditional boundaries of the « American Way », to embrace an increasingly globalized market.
357

Hodnocení finanční situace podniku a návrhy na její zlepšení / Evaluation of the Financial Situation in the Company and Proposals to Its Improvement

Koukalová, Žaneta January 2015 (has links)
Presented master’s degree thesis provides an insight into financial situation of a selected wine production company in a specific period of time (2009 – 2013). The data has been based on own experience, technical literature, and private resources as well. The results include identification of several general theoretical foundations, special methods for the company's financial condition assessment, extensive information pool concerning the company, and precise elaboration of financial analysis. As far as thesis conclusions are concerned, several measures have been designed to provide an effective basis for both successful and sustainable company's management in the future.
358

Hodnocení finanční situace podniku a návrhy na její zlepšení / Evaluation of the Financial Situation in the Company and Proposals to Its Improvement

Peštuka, Jiří January 2015 (has links)
The focus of this master thesis is the analysis of the financial situation of a particular company from 2008 - 2013. The first part of the thesis provides a theoretical description of the methods that are used in the assessment of the financial situation of the company. The following part of the thesis provides facts about the company. The diploma thesis conducted a strategic analysis of external and internal surroundings. The financial assessment of the company is based on the analysis of financial statements of the company. In the final part of the thesis the findings are evaluated and solutions proposed accordingly. The implementation of the outlined solutions should lead to the gradual improvement of the financial situation of the company.
359

Zhodnocení finanční situace podniku a návrhy na zlepšení / Evaluation of the Financial Situation of a Company and Proposals for Improvement

Harašta, Lukáš January 2018 (has links)
This diploma thesis focuses on the evaluation of the financial situation of Auto Slavíček s.r.o. for the period 2010-2016, and to formulate proposals for improvement. The thesis analyses the current economic situation of the company. The resulting values are compared with selected competing companies. The diploma thesis is divided into four chapters. The first chapter deals with the objectives of the work and the methodology of the solution. The second chapter analyses methods and procedures of financial and strategic analysis. The third chapter reviews the financial situation of the company. The last chapter presents your own suggestions for improvement.
360

Hodnocení finanční situace podniku a návrhy na její zlepšení / Evaluation of the Financial Situation in the Firm and Proposals to its Improvement

Čevelíková, Barbora January 2012 (has links)
This master’s thesis evaluates financial situation of the company REDA a.s. between years 2005 and 2010 on the basis of the selected financial analysis methods. The main goal of this thesis is to formulate suggestions for improving financial situation in the company. This goal is reached in final part of the master’s thesis.

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