Dissertations / Theses on the topic 'Poliginy'
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Azevedo, Samuel Oliveira de. "Sistema de agentes polig?nicos para estegan?lise de imagens digitais." Universidade Federal do Rio Grande do Norte, 2007. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17965.
Full textConselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
In this work, we propose a multi agent system for digital image steganalysis, based on the poliginic bees model. Such approach aims to solve the problem of automatic steganalysis for digital media, with a case study on digital images. The system architecture was designed not only to detect if a file is suspicious of covering a hidden message, as well to extract the hidden message or information regarding it. Several experiments were performed whose results confirm a substantial enhancement (from 67% to 82% success rate) by using the multi-agent approach, fact not observed in traditional systems. An ongoing application using the technique is the detection of anomalies in digital data produced by sensors that capture brain emissions in little animals. The detection of such anomalies can be used to prove theories and evidences of imagery completion during sleep provided by the brain in visual cortex areas
Neste trabalho, propomos um sistema multi-agentes para estegan?lise em imagens digitais, baseado na met?fora das abelhas polig?nicas. Tal abordagem visa resolver o problema da estegan?lise autom?tica de m?dias digitais, com estudo de caso para imagens digitais. A arquitetura do sistema foi projetada n?o s? para detectar se um arquivo ? ou n?o suspeito de possuir uma mensagem oculta em si, como tamb?m para extrair essa mensagem ou informa??es acerca dela. Foram realizados v?rios experimentos cujos resultados confirmam uma melhoria substancial (de 67% para 82% de acertos) com o uso da abordagem multi-agente, fato n?o observado em outros sistemas tradicionais. Uma aplica??o atualmente em andamento com o uso da t?cnica ? a detec??o de anomalias em dados digitais produzidos por sensores que captam emiss?es cerebrais em pequenos animais. A detec??o de tais anomalias pode ser usada para comprovar teorias e evidencias de complementa??o do imageamento durante o sono, provida pelo c?rebro nas ?reas visuais do c?rtex cerebral
Sibilio, Grazia. "Sulla mappa di Riemann per i poligoni." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18240/.
Full textLeonaitis, Edmundas. "Tręšimo poveikis paprastosios pušies būklei buvusiame Dumsių poligone." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20090114_154340-67860.
Full textThe aim of the study: to determine and compare the influence of the application of the different doses of mineral fertilizers, sawdust compost and wood ash applied in complex with nitrogen on some physical and chemical properties of Arenosols in former military range area in Dumsiai; to evaluate the improvement possibilities of the condition and growth of Scots pine plantations in the area. The object of the study: Scots pine plantations growing on Arenosols in former military range area in Dumsiai; the fertilization trials where the mineral fertilizers were applied in 2001, and the fertilization trials where the sawdust compost and wood ash in complex with N fertilizers were applied in 2005 were further investigated. Methods: the ground vegetation cover (%) was visually assessed in 1 m² plots (5 plots were systematically laid in each treatment); height increment of Scots pine trees (n=50) was measured and discoloration of the needles (%) was visually assessed; mineral topsoil samples from 0-5 cm; 5-10 cm and 10-20 cm depths were collected (each combined sample was taken from 20 places), and chemically analysed for pHCaCl2, C and N concentrations. The results: the data of earlier investigations from the years 2001-2005 were analysed; the influence of the mineral fertilizers, sawdust compost and wood ash treatments on mineral topsoil pH, also the changes of N and C concentrations was analysed; the effects of the ground vegetation cover was assessed; the condition and growth... [to full text]
Araujo, Elismar Jose de. "Aplicacao de determinante: area de poligono convexo e volume de piramide." Universidade Federal de Goiás, 2015. http://repositorio.bc.ufg.br/tede/handle/tede/4728.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
This work will concentrate on making a rereading of the theories that surround the procedures for calculating the area of a convex polygon, as well as the volume of a pyramid whose base is a polygon convex, with its vertices properly represented in a coordinate system, in the plan or in space, respectively. Addresses some topics on arrays and determinant and some of its applications, in particular the study of polygon area and the volume of the pyramid. Based on applying a decisive factor for the calculation of the area of a triangle with its vertices represented in a coordinate system, presents a new theorem to calculate the area of any polygon convex, as well as, a new formula to calculate the volume of any pyramid with convex basis as a direct application of the volume of the tetrahedron with its vertices represented in an orthogonal system. For both, it was essential to the concept of coordinates in the plane and in space, vectors in the plane and in space, and some of its properties, being essential for the demonstrate the volume of the tetrahedron and the area of the triangle, using determinant. Keywords: Volume. Area. Convex polygon. Pyramid. Triangle. Tetrahedron
O presente trabalho versar a em fazer uma releitura das teorias que circundam os procedimentos de c alculo da area de um pol gono convexo, assim como, do volume de uma pir^amide cuja base e um pol gono convexo, com seus v ertices devidamente representados em um sistema de coordenadas, no plano ou no espa co, respectivamente. Aborda alguns t opicos sobre matrizes e determinante e algumas de suas aplica c~oes, em especial o estudo de area de pol gonos e o volume de pir^amide. Baseado na aplica c~ao de determinante para o c alculo da area de um tri^angulo com seus v ertices representados em um sistema de coordenadas, apresenta um novo teorema para o c alculo da area de qualquer pol gono convexo, assim como, uma nova f ormula para calcular o volume de qualquer pir^amide com base convexa como uma aplica c~ao direta do volume do tetraedro com seus v ertices representados em um sistema ortogonal. Para tanto, foi imprescind vel abordar o conceito de coordenadas no plano e no espa co, vetores no plano e no espa co e algumas de suas propriedades, sendo fundamentais para a demonstrar o volume do tetraedro e a area do tri^angulo, usando determinante.
Greičiūtė, Kristina. "Karinių poligonų dirvožemio pažeidimų ir taršos tyrimai bei elektrokinetinio metodo taikymo galimybės." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2007. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20070305_133717-36511.
Full textGreičiūtė, Kristina. "Karinių poligonų dirvožemio pažeidimų ir taršos tyrimai bei elektrokinetinio metodo taikymo galimybės." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20061127_092815-32568.
Full textCeslevičius, Dainius. "Elninių žvėrių gausos ir žiemos ganyklų būklės dinamika Padauguvos miško biosferos poligone." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100621_114243-47280.
Full textResearch performed in spring of 2008 and 2010 in Padauguva forest biosphere plygon, which covers 5782 ha. Each year around 500 sampling plots were intercepted to evaluate condition of winter pastures. It was estimated, that winter pastures are in good condition. It was estimated intensity and dynamics of deer browsing on undergrowth and understorey tree and shrub species during the 2008-2010 period. Condition of Roe deer population, living in high disturbance zone, is good. Population of Red deer, living in same territory, considered as perspective. Density of Moose Padauguva forest biosphere polygon is too low. Broadleaves and mixed broadleaved with coniferous stands dominates in Padauguva forest biosphere polygon. They compose 78,0% of total area of forest stand.
Vladimir, Manojlović. "Značaj karotidne endarterektomije kod asimptomatskih pacijenata sa nekompletnom kolateralizacijom unutar Vilisovog poligona." Phd thesis, Univerzitet u Novom Sadu, Medicinski fakultet u Novom Sadu, 2015. http://www.cris.uns.ac.rs/record.jsf?recordId=95440&source=NDLTD&language=en.
Full textINTRODUCTION: Circle of Willis is the most important reserve of collateral flow between the extracranial arteries that supply the brain and has the ability to develop collateral pathways in extracranial carotid disease. This anatomical structure is subject to variations which include a disruption in the continuity and incompleteness of collateralisation. OBJECTIVES: was to determine whether the incompleteness of the Circle of Willis is more often associated with neurological symptoms and ishemic cerebral lesions in patients with extracranial carotid artery disease. Also, the objective was to determine whether cerebrovascular reactivity in patients with asymptomatic extracranial carotid artery disease depends on the completeness Circle of Willis and how surgical treatment affects the parameters of cerebrovascular reserve in patients with complete and incomplete Circle of Willis. METHODS: This study analyzed the findings of MRA in 211 patients with extracranial carotid artery disease and 102 patients in the control group. In prospective study in 98 patients with asymptomatic carotid artery disease in addition to the MRA findings cerebrovascular reactivity was determined by determining the "breath hold index" -a (BHI) before and after surgical treatment. RESULTS: Incomplete Circle of Willis was found in 25% of asymptomatic, 47.5% of symptomatic patients with carotid artery disease, and 59% of the control group patients, where the difference proved to be statistically significant. In asymptomatic patients with incomplete Circle of Willis BHI values were 0.62 preoperatively and 1.01 postoperatively on the side of the lesion. In the case of incomplete Circle of Willis preoperative BHI values were 0.88 preopertively and 1.09 postoperatively in asymptomatic patients. The differences are shown to be statistically significant between the groups before and after surgical treatment. The increase was significantly more pronounced in the group of asymptomatic patients with incomplete Circle of Willis. There were not recorded major operative complications (perioeprativni stroke, mortality) and the occurrence hyperperfusion syndrome was most affected by completeness of the Circle of Willis, a value BHI and preoperative treatment of hypertension. CONCLUSIONS: Incomplete Circle of Willis is a risk factor for the occurrence of neurological symptoms or ischemic brain lesions in patients with extracranial carotid artery disease. In asymptomatic patients incomplete Circle of Willis affects the reduced cerebrovascular reactivity and a higher risk of stroke. The parameters of cerebrovascular reactivity significantly improved after surgical treatment.
Aponte, Olga Ines Cepeda. ""Poliginia e monoginia em Melipona bicolor (Apidae, Meliponini): do coletivo para o individual"." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-03022005-160246/.
Full textCap. 2 In order to detect possible differences in the efficiency of the Provisioning and Oviposition Process (POP), we compared a monogynous from a polygynous colony of Melipona bicolor. At the beginning of observations, the polygynous colony had three laying queens, but one of these ceased to lay when observations where just at the middle. We then decided to split in two the database of the polygynous colony depending on the number of queens laying, being these three or two. ¶ We observed great differences between monogynous and polygynous conditions. In the polygynous colony, our investigation permitted us to perceive the strong competition between queens for laying. In this type of colony, queens were in a rush for laying their eggs. As a consequence, POP were very short and this diminished the number of trophic eggs laid. The queen of the monogynous colony consumed many more trophic eggs and in order to achieve this, she would increase the duration of the POP, specifically, the post-provisioning phase. In the polygynous colony, the number of workers, both dischargers and sealers were also greater than in the monogynous colony. This fact could be reflecting a more efficient process in polygynous conditions: more workers are attracted and complete the process in less time. However, again we may perceive the competition between the queens of this colony. The queens stimulated POP in cells that were still not ready, increasing the difficulty for its sealing by the workers. The total outcome of the combination of all these facts is that there is significant major production of queen eggs in the polygynous colony, although the number of eggs laid by each queen is smaller. We also detected a type of dominance reflected on the time queens spent laying their eggs. Cap. 3 There are hypotheses on which could be the necessary conditions that lead to stable multiple queen associations. Some hypothesis state mechanisms such as staying incentives for subordinated queens, and may be relevant for discussing the reversal process witnessed in a polygynous colony of Melipona bicolor that shifted to a monogynous condition. In a polygynous colony, three queens were similar in various aspects. Egg laying or consumption of trophic eggs, presented no differences or discriminations and each queen had an equal chance to lay or eat. The queens were of the same age, so it could be expected that they would have a similar performance in egg laying. However, a clear reproductive skew developed. It was also clear that the duration of the provisioning and oviposition process (POP), revealed differences in the pace-marking for the queens principally when alone. ¶ The present paper describes the possible relations between egg laying rate and nutritional factors. We discuss the possible existence of a queen pheromone, regulating the sealing behavior of the workers. Furthermore, workers might play a role in the contest for reproduction among multiple queens. In combination, these factors give rise to increasing differences among the queens resulting in egg laying cessation and disappearance of two of the queens from the comb. Cap. 4 When we followed individual workers of Melipona bicolor in monogynic and polygynic colonies, we found that there are great variations between the behaviors of each bee. Individuals that had laid some type of egg seemed to be the most interested in the provisioning and oviposition process (POP). Therefore, we then analyzed the population dividing them into layers and non layers. We proved that workers that lay trophic eggs contribute effectively to the POP, but reproductive workers, in spite of being so few, achieve such high levels of activity that it seems they exclude the non-laying bees from the process. We also found special individuals with an extraordinary participation in one or more of the basic behaviors of the POP, but these also seem to be motivated by the same drive of laying some type of egg. However, we also found differences between the monogynous and polygynous colonies, but these differences were difficult to analyze due to the filming moments for each colony. The general patterns found for both monogynous and polygynous colonies are very important because they demonstrate that the fact of laying an egg provokes quantitative differences in the behaviors, producing from lazy individuals up to those hyperactive. Ovary development is then thought to be the internal proximal cause producing the diverse response thresholds that in a cascade effect, produces an auto-reinforcement when repeatedly performed the task, that at the same time affects the performance of others. The observation on the differences presented by layers and non layers, represents a strudy base to continue exploring the proximal causes for behavioral differentiation. Cap.5 Studies on division of labor have demonstrated that despite being an important factor, etharism alone would impose rigidity to societies and thus, would make them less efficient probably leading them to extinction. Plasticity of behavior is then recognized as essential being expressed as individual differentiation among genetically similar sisters. Furthermore, task specialization of some individuals leads to a better performance of the colony as a whole. In this chapter we give evidence for specialization in the provisioning and oviposition process: a task such as the first discharge of food in Melipona bicolor, is carried out mainly by few, specialized individuals that exhibit a particular behavioral repertory. Cap. 6 Caste determination is a complex topic that has received much attention but remains elusive, leaving many questions to be solved. However, there are some facts that have been comprehended. It is recognized the influence of external factors such as the amount and/or the quality of the food ingested by the larvae, interacting with hormones and genes. Since the workers administrate the larval food, caste determination is socially controlled. Could it happen that among the nurse bees there are individuals that would prefer to raise sister queens than sister workers? To answer this question, it would be necessary to establish the presence or absence of glandular secretions of high nutritional value in the larval food, together with techniques to follow and assess the food dischargers. Through video recordings made on the Provisioning and Oviposition Process (POP) in Melipona bicolor, we recognized two types of food discharges: the first fluid and shiny and another discharge dense and opaque. From each cell filmed we compiled its historical plus the caste in formation. We did not find any relation between the resulting caste and the number of solid or liquid discharges it had received. We discuss why our method may not be an accurate technique to study this difficult and complex topic, but may support future investigations. Cap. 7 Ovary development in social insects has been found to be correlated with dominance relationships, levels of activity and production of juvenile hormone. In the follicular epithelium of ovaries, juvenile hormone stimulates the absorption of nutrients; however, oogenesis is a nutrient limited process. The above roughly summarizes the interrelated causes and effects involved in the reproduction of an individual. One of the biggest differences between Apis bees and stingless bees, is that in queenright conditions, stingless bee workers develop their ovaries retaining their capacity to lay eggs (although most are of a trophic nature). Ovary development is common among young bees attending the provisioning and oviposition process (POP). The several tasks that are involved in the POP are carried on with different levels of intensity by the individuals participating in the process. As we demonstrated in the previous chapter, the individuals that are egg layers are most involved in the POP contributing efficiently to the process. Dissections revealed that there is a significant correlation between the area of the ovaries and the levels of activity presented by the workers of a monogynouos colony of Melipona bicolor. Since nutritional factors also play an important role, our method of correlating the final weight of the bees with activity, proved to be adequate to indirectly test the influence of food in oogenesis. In this chapter we discuss the meaning of retaining the capacity to produce eggs in an evolutionary scenario related to division of labor in eusocial insects.
Dorey, Pieter Johannes. "Genesis 2:24 - Locus Classicus vir monogamie? 'n Literêr-historiese ondersoek na perspektiewe op poligamie in die Ou Testament (Afrikaans)." Thesis, University of Pretoria, 2003. http://hdl.handle.net/2263/23492.
Full textOld Testament Studies
unrestricted
Souza, Danival José de. "Discriminação e sobrevivência de operárias em colônias monogínicas e poligínicas de Acromyrmex subterraneus molestans (Hymenoptera: Formicidae)." Universidade Federal de Viçosa, 2003. http://www.locus.ufv.br/handle/123456789/9839.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico
A poliginia dentro de uma colônia de inseto social pode ser primária ou secundária. A poliginia primária ocorre quando várias rainhas se juntam para iniciar uma nova colônia. Também, colônias monogínicas podem aceitar novas rainhas fecundadas, tornando-se assim poligínicas secundariamente. A poliginia diminui o grau de parentesco entre as operárias companheiras de ninho e, com isso, os benefícios de se ajudar indivíduos mais próximos geneticamente também se reduzem. Estudos acerca do reconhecimento entre companheiras de ninho e da adoção de rainhas são imprescindíveis para esclarecer como o número de rainhas é regulado, bem como as causas da variação nesse número. Neste trabalho, escolheu-se como objeto de estudo Acromyrmex subterraneus molestans Santschi, 1925, uma subespécie de formiga cortadeira bastante comum na região de Viçosa, MG. Numa mesma região são encontradas colônias monogínicas e poligínicas dessa subespécie, o que a torna ideal em estudos dos processos que regulam o número de rainhas em colônias de Formicidae. Estudos conduzidos em laboratório mostraram que colônias monogínicas de Ac. subterraneus molestans podem se tornar poligínicas pelo mecanismo de adoção de rainhas de outras colônias. Operárias da maioria das colônias estudadas não foram capazes de discriminar entre rainhas de outras colônias da sua própria. A ausência de comportamento discriminatório também foi verificada quando se realizaram encontros de operárias de diferentes colônias. Análises químicas mostraram que não existem diferenças qualitativas no perfil químico cuticular das colônias, quer sejam elas monogínicas ou poligínicas. Finalmente, avaliou-se a possibilidade de haver sobrevivência diferencial entre operárias de colônias poligínicas e monogínicas, quando essas eram mantidas em contato com o lixo da própria colônia. Os testes de sobrevivência mostraram que operárias dos dois tipos de colônia morriam a taxas estatisticamente iguais. Vantagens da poliginia e da ausência de comportamento discriminatório são discutidas nesta dissertação.
Polygyny within a colony of social insects can be primary or secondary. Primary polygyny may occur when several queens jointly initiate a new colony. Monogynous colonies can also accept newly mated queens and become secondarily polygynous. Polygyny reduces kinship among nestmate workers and, consequently, reduces the benefits of helping genetically close individuals. Studies on nestmate recognition and on queen adoption are essential to elucidate how the number of queens is regulated, as well as the causes of the variation in this number. In this research, Acromyrmex subterraneus molestans Santschi, 1925 was chosen because it is a very common leaf-cutting ant in the region of Viçosa, Minas Gerais State where the Federal University of Viçosa is located. Additionally in this region monogynous and polygynous colonies of this subspecies occur naturally, which makes them ideal for studying regulation in queen number in Formicidae. Laboratory studies demonstrated that monogynous colonies of Ac. subterraneus molestans may become polygynous by the mechanism of queen adoption from other colonies. Workers of most of the studied colonies were not able to discriminate among queens from other colonies and their own. The lack of discriminatory behavior was also observed when encounters from different colonies were induced. Chemical analyzes showed no qualitative differences in the cuticular chemical profile of either polygynous or monogynous colonies. Finally, the possibility of differential survival among workers from these colonies when maintained in contact with colony refuse was evaluated. Survival tests revealed that workers from either monogynous or polygynous colonies died at equal rates in contact with refuse. Advantages of polygynous and of the lack of discriminatory behavior among workers are discussed in this thesis.
Ferrari, Lucia. "Riduzione dei sistemi di forze ai sistemi semplici con applicazione alle forze parallele e costruzione del poligono funicolare." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21751/.
Full textPatria, Francesca. "Serie di Puiseux." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10056/.
Full textHine, James A. H. S. "Peasants, politics and agrarian transition in the eastern Amazon : a case study of peasant organisation and the Poligono das Castanhais." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334028.
Full textFernandes, Fernanda Rodrigues 1983. "Area de vida de Gracilinanus microtarsus (Didelphimorphia: Didelphidae) : inferencias baseadas nos metodos do poligono convexo minimo e da modelagem estatistica." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/316226.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia
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Resumo: A área de vida de Gracilinanus microtarsus foi estudada através de métodos de captura-marcação-recaptura na Reserva Biológica de Mogi Guaçu, estado de São Paulo, sudeste do Brasil, de novembro de 2005 a agosto de 2006. Um total de 467 pontos de localização foi obtido e as áreas de vida foram estimadas com o método do polígono convexo mínimo (MPC) com 90% dos dados dos pontos de localização. Considerando-se todas as capturas de cada indivíduo, a área de vida média estimada pelo MPC 90% foi de 1.161m2 (± 873m2) para as fêmeas e 1.403m2 (± 1.810m2) para os machos. Na estação quente-úmida, o tamanho médio da área de vida das fêmeas foi de 1.125m2 (± 880m2) e dos machos foi de 1.212m2 (± 1.449m2). Na estação friaseca, as fêmeas e os machos tiveram áreas de vida com tamanhos médios iguais a 1.260m2 (± 946m2) e 2.025m2 (± 2.899m2), respectivamente. Houve uma relação positiva significativa entre o tamanho médio da área de vida e a massa corporal dos indivíduos capturados. O modelo linear generalizado mais parcimonioso indicou que a massa corporal contribui significativamente para a variação no tamanho da área de vida. Todavia, quando foram removidos dois prováveis outliers, o modelo linear generalizado mais parcimonioso indicou que o sexo contribuiu significativamente para a variação no tamanho da área de vida. Os machos ocuparam áreas de vida maiores, supostamente devido à existência de dimorfismo sexual no tamanho corporal nesta espécie, sendo os machos maiores do que as fêmeas
Abstract: The home range of Gracilinanus microtarsus was studied through capture-mark-recapture method in the Biological Reserve of Mogi Guaçu, state of São Paulo, southeastern Brazil from November 2005 to August 2006. A total of 467 location points was obtained and home range estimated with minimum convex polygon (MPC) with 90% of the data points. Considering all captures of each individual, mean home range size estimated by MPC 90% was 1,161m2 (± 873m2) for females and 1,403m2 (± 1,810m2) for males. In the warm-wet season mean home range size was 1,125m2 (± 880m2) for females and 1,212m2 (± 1,449m2) for males. In the cool-dry season the mean size of home range was 1,260m2 (± 946m2) for females and 2,025m2 (± 2,899m2) for males. Home range size was positively correlated with body mass. The general linear model showed that body mass significantly contributed to the variation of home range size and when the two outliers were removed, the generalized linear model showed that sex significantly contributed to the variation of home size. Males had larger home ranges than females possibly because sexual dimorphism in body mass in this species, with males being larger than females
Mestrado
Mestre em Ecologia
Ivan, Pavkov. "Faktorizacija polinoma dve promenljive sa celobrojnim koeficijentima pomoću Newton-ovog poligona i primena u dekodiranju nekih klasa Reed – Solomon kodova." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2107. https://www.cris.uns.ac.rs/record.jsf?recordId=104907&source=NDLTD&language=en.
Full textThe research subject of the thesis is factorization of bivariate polynomials with integer coefficients via associated Newton polygons. Formalization of the necessary and sufficient condition for the existence of a non – trivial factorization of an arbitrary bivariate polynomial with integer coefficients obtains theoretical basis for construction of an effective factorization algorithm. Finally, these theoretical results are applied in decoding special class of Reed – Solomon codewords, mixture of two codewords.
Portioli, Marco. "Dalla geometria con riga e compasso alla geometria con origami." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8781/.
Full textMarasco, Domenico. "Tassellazioni di varietà ellittiche, piatte e iperboliche." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Find full textTamburini, Caterina. "Presentazione di varietà tridimensionali tramite poliedri." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9701/.
Full textCameli, Federica. "Problemi di minimo e massimo dall'antichità a oggi." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12243/.
Full textHarrison, Alexander R. "Joseph F. Smith: The Father of Modern Mormonism." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1401400299.
Full textBuzatto, Bruno Alves. "Biologia reprodutiva do opilião Acutisoma proximum (Arachnida: Opiliones) : estrategias alternativas de acasalamento em machos e cuidado parental em femeas." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/316364.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia
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Resumo: A presente dissertação investigou a biologia reprodutiva do opilião Acutisoma proximum no Parque Estadual Intervales, sul do estado de São Paulo. No Capítulo 1, o sistema de acasalamento da espécie é descrito em detalhes. Fêmeas depositam seus ovos sob folhas na vegetação que margeia riachos de interior de mata e utilizam preferencialmente determinadas espécies de plantas como sítio de oviposição. No começo da estação reprodutiva, machos lutam entre si pela posse de territórios na vegetação onde fêmeas se reproduzirão. Alguns meses mais tarde, na mesma estação reprodutiva, essa poliginia por defesa qe recursos muda para uma poliginia por defesa de fêmeas, e machos passam a guardar cada fêmea individualmente em seqüência. O opilião A. proximum é o primeiro aracnídeo não-acarino que apresenta uma mudança em seu sistema de acasalamento ao longo da estação reprodutiva. No Capítulo 2, são descritas duas estratégias alternativas de acasalamento entre os machos de A. proximum, e a morfologia.e o comportamento dos machos que adotam cada estratégia é investigado. Os machos de A. proximum se dividem em dois morfos distintos, de acordo com a relação alométrica do comprimento da perna lI, que é também mais longa nos machos do que nas fêmeas. A diferença na morfologia dos dois morfos só é detectável quando muitos machos são medidos e a relação entre o comprimento do segundo par de pernas e o tamanho do corpo são analisados, o que se encaixa na definição de dimorfismo intra-sexual críptico. Machos com pernas II longas defendem territórios na vegetação, brigando e repelindo outros machos que se aproximam das fêmeas dentro desses territórios. Machos com pernas II curtas nunca defendem territórios ou brigam. Eles se deslocam entre os territórios dos machos grandes, invadindo-os e copulando com as fêmeas que estão dentro deles. Este trabalho é o primeiro a descrever, com dados comportamentais e morfológicos, a existência de estratégias alternativas de acasalamento na ordem Opiliones. No Capítulo 3, o enfoque passa a ser as fêmeas e os custos e benefícios do cuidado maternal em A. proximum. Em um experimento de remoção de fêmeas guardiãs, os ovos desprotegidos sobreviveram 75,6% menos que os ovos protegidos pelas fêmeas, revelando a importância da proteção materna. Em outro experimento, as desovas de metade das fêmeas foram removidas e o sucesso reprodutivo delas foi monitorado por dois anos. Fêmeas impedidas de cuidar da prole produziram novas desovas mais frequentemente e tiveram um sucesso reprodutivo 18 % maior que o das fêmeas que cuidaram da prole. Adicionalmente, o estudo de captura-marcação-recaptura não demonstrou nenhuma diferença entre a sobrevivência de fêmeas que foram impedidas de cuidar da prole e fêmeas que cuidaram da prole. Pesando os custos e benefícios do comportamento de guarda de ovos, uma estratégia de abandono da prole implicaria em uma redução média de 73,3% no sucesso reprodutivo total das fêmeas. Apesar dos custos da guarda de ovos para a fecundidade das fêmeas, o cuidado maternal aumenta o seu sucesso reprodutivo devido à crucial proteção aos ovos fornecida pelas fêmeas
Abstract: Not informed.
Mestrado
Ecologia
Mestre em Ecologia
Werneck, Rachel Miranda. "Efeito da disponibilidade de sítios de nidificação sobre o sistema de acasalamento e o cuidado paternal em um opilião neotropical (Arachnida: Opiliones)." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-15102012-092532/.
Full textNatural cavities are a reproductive resource that can be monopolized, and their availability determines the intensity of male-male competition, which in turn may influence the costs of paternal care since the higher the risk of loosing the resource, the low should be male foraging frequency. Females of the harvestman Magnispina neptunus use natural cavities as nest site, which are monopolized by males in typical resource defense polygyny mating system. After oviposition, females leave the nests and all parental activities are in charge of males. The goal of this study was to evaluate the effect of nest site availability on the intrasexual competition and the costs of paternal care in M. neptunus. Two experimental groups were established in the laboratory: high (8 nests) and low (4 nests) nest site availability. Each group was composed of seven terraria containing 12 males and 12 females. Although the reduction of in the number of nests sites has indeed reduced the number of males holding nests, male size did not influence the probability of acquiring and maintaining a nest. Apparently, the small diameter of entrance in the experimental nests reduces the importance of male size on their resource holding power. Only previous residence seems to influence the output of agonistic interactions between two males and, therefore, the costs of leaving the nest to forage are likely to be high. In fact, guarding males remain almost all the time inside their nests, which increases the costs of paternal care. As a consequence, filial cannibalism is frequent in both experimental groups because the costs in terms of reduction in clutch size are likely to lower than the benefits of holding a nest containing eggs, which is known to increase male attractiveness and his chance of acquiring additional eggs
Alissa, Louise M. "Effect of reproductive site limitation on the intensity of sexual selection and the quality of paternal care: a meta-analysis." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-23102018-090541/.
Full textA disponibilidade de sítios reprodutivos influencia tanto o comportamento de machos quanto de fêmeas em espécies cujo sistema de acasalamento depende da defesa de recursos. Usando uma abordagem meta-analítica, testamos cinco previsões direta ou indiretamente relacionadas à teoria de sistemas de acasalamento. Esperávamos que a limitação de sítios reprodutivos promoveria: (1) aumento na competição masculina pela posse de recursos; (2) aumento na variância do sucesso reprodutivo dos machos, gerando valores alto de oportunidade para a seleção sexual; (3) aumento da intensidade da seleção sobre características masculinas relacionadas à posse de recursos; (4) aumento no risco de competição espermática e (5) diminuição da qualidade do cuidado paternal. Compilamos informações de estudos observacionais e experimentais que compararam o comportamento reprodutivo de indivíduos da mesma espécie em situação de alta e baixa disponibilidade de sítios reprodutivos. Encontramos que, quando os sítios reprodutivos são escassos, há um ligeiro aumento na competição masculina, com maiores taxas de roubo de ninhos e interações agonísticas, e um ligeiro aumento no gradiente de seleção sobre características masculinas, com machos bem sucedidos tendendo a ser maiores do que machos mal sucedidos em monopolizar recursos. A disponibilidade de sítios reprodutivos não teve nenhum efeito consistente sobre a oportunidade para a seleção sexual e o risco de competição espermática. Entretanto, machos territoriais investiram mais em gônadas e perderam menos paternidade quando os sítios reprodutivos eram escassos. Não encontramos nenhum efeito da disponibilidade de sítios reprodutivos sobre a qualidade do cuidado paternal. Em conjunto, nossos resultados indicam que as previsões sobre como a disponibilidade de sítios reprodutivos influencia diversos aspectos de sistemas de acasalamento baseados na defesa de recursos têm fraco respaldo empírico. Tais previsões não consideram a plasticidade nas táticas de acasalamento de machos e fêmeas, tornando-as demasiadamente simplistas. Adicionalmente, desde a formulação original da teoria de sistemas de acasalamento, nossa compreensão sobre competição espermática aumentou. Sabemos atualmente que previsões acuradas sobre a intensidade e direção da seleção sexual devem levar em consideração processos pré- e pós-copulatórios. Finalmente, a interconexão entre seleção sexual e cuidado parental é complexa e a teoria original de sistemas de acasalamento não provê elementos suficientes para a construção de previsões claras e de amplo escopo taxonômico
Milan, Đorđević. "Примена ГИС-а у картографској генерализацији категоријских карата." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2016. https://www.cris.uns.ac.rs/record.jsf?recordId=100913&source=NDLTD&language=en.
Full textAutomatizovana kartografska generalizacija je od velikog značaja u kartografiji, a pravih rešenja još uvek nema. Kartografska ge neralizacija poligona i kategorijskih karata predstavlja veoma kompleksan problem, a predložena rešenja nalaze se uglavnom na konceptualnom nivou. Metoda predstavljena u ovoj doktorskoj disertaciji predstavlja opšti pristup automatizovanoj kartografskoj generalizaciji kategorijskih karata primenom GIS softvera. Kao rezultat smanjenja razmera, neki od poligona postaju isuviše mali da bi bili prikazani u ciljanom razmeru tako da se moraju ukloniti, a njihovo mesto će zauzeti neka druga pojava. Najveći izazov predstavlja smanjenje semantičkih grešaka i minimiziranje promene udela klasa poligona tako da karta više odgovara realnosti na terenu. To je ostvareno grupisanjem poligona iste klase, tako što se vrši njihovo izmeštanje i stapanje. Na ovaj način,određeni broj malih poligona koji bi bili eliminisani postaju poligoni sa dovoljnom površinom. Drugi način manjenja grešaka je stapanje poligona, koji imaju nedovoljnu površinu, sa većim poligonima koji su im tematski slični. Takođe je predstavljena i metoda za otkrivanje i eliminisanje uskih delova poligona. Sve ove metode moru biti iskorišćene za izradu bilo koje kategorijske karte (npr. klimatske, pedološke, karte upotrebe zemljišta, zemljišnog pokrivača, geološke karte itd.) na osnovu digitalnog modela predela. Poseban softver je razvijen za izmeštanje gradivnih ćelija poligona ipi preciznije njihovih centara. Dodatni program je apravljen za rešavanje problema uskih koridora kod poligona. Model udruživanja je napravljen u QGIS-y, a model stapanja u PostGIS-y, slobodnom softveru, otvorenog koda. Rezultati pokazuju da je izabrani pristup uspešan.
Automated cartographic geпeralizatioп is of great importaпce iп cartography апd real solutioпs are still lackiпg. Cartographic geпeralizatioп of polygoпs апd categorical maps is а high complexity problem апd solutioпs for it аге maiпly proposed оп а coпceptual level. The method iпtroduced iп this PhD thesis preseпts а geпeral approach to automated cartographic geпeralizatioп of categorical maps usiпg GIS software. As а coпsequeпce of scale reductioп some of the polygoпs аге becomiпg too small for the target scale апd must bе removed, so the other feature takes its place оп the map. The biggest challeпge was to Lesseп semaпtic errors апd miп imize the chaпge of share of feature classes so the map better correspoпds to the reality оп the grouпd. This is achieved bу group-iпg polygoпs of the same class bу displaciпg апd mergiпg them. lп this way the пumber of small polygoпs which should bе elimiпated become опеs with sufficieпt агеа. The other way of lesseпiпg errors are mergiпg polygoпs with iпsufficieпt area with а larger adjaceпt objects that is thematically similar. The method for detectiпg апd elimiпatiпg пarrow sectioпs of polygoпs are also proposed.All those methods could bе used for deriviпg апу categorical map (e.g. climate, soil, laпd use, laпd cover, geological map etc.) from digital laпdscape model. Specific software is developed for displaciпg polygoпs structural cells or more precisely their ceпters. The other software is made for dealiпg with polygoп пarrow sectioпs. The aggregatioп model is desigпed iп QGIS апd the mergiпg model is desigпed iп PostGIS, both free апd ореп source software. The results show that the choseп approach is successful.
Srđan, Milićević. "Algorithms for computing the optimal Geršgorin-type localizations." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=114425&source=NDLTD&language=en.
Full textПостоје бројни начини за локализацију карактеристичних корена. Један од најчувенијих резултата је да се спектар дате матрице АCn,n налази у скупу који представља унију кругова са центрима у дијагоналним елементима матрице и полупречницима који су једнаки суми модула вандијагоналних елемената одговарајуће врсте у матрици. Овај резултат (Гершгоринова теорема, 1931.), сматра се једним од најзначајнијих и најелегантнијих начина за локализацију карактеристичних корена ([61]). Међу свим локализацијама Гершгориновог типа, минимални Гершгоринов скуп даје најпрецизнију локализацију спектра ([39]). У овој дисертацији, приказани су нови алгоритми за одређивање тачне и поуздане апроксимације минималног Гершгориновог скупа.
Postoje brojni načini za lokalizaciju karakterističnih korena. Jedan od najčuvenijih rezultata je da se spektar date matrice ACn,n nalazi u skupu koji predstavlja uniju krugova sa centrima u dijagonalnim elementima matrice i poluprečnicima koji su jednaki sumi modula vandijagonalnih elemenata odgovarajuće vrste u matrici. Ovaj rezultat (Geršgorinova teorema, 1931.), smatra se jednim od najznačajnijih i najelegantnijih načina za lokalizaciju karakterističnih korena ([61]). Među svim lokalizacijama Geršgorinovog tipa, minimalni Geršgorinov skup daje najprecizniju lokalizaciju spektra ([39]). U ovoj disertaciji, prikazani su novi algoritmi za određivanje tačne i pouzdane aproksimacije minimalnog Geršgorinovog skupa.