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1
Santos, Rodrigo Pires dos. "A correspondência Hitchin-Kobayashi." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/306014.
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Orientador: Marcos Benevenuto JardimDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matemática, Estatística e Computação Científica
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Resumo: Apresentamos uma introdução aos conceitos de geometria complexa necessários à compreensão da correspondência Hitchin-Kobayashi. Enunciamos e provamos que todo fibrado que admite uma conexão de Hermite-Einstein é poliestável. Em seguida, discutimos resultados sobre Q-fibrados e enunciamos uma correspondência Hitchin-Kobayashi para esse caso. Por último, temos um resultado do autor que relaciona a estabilidade de fibrados com a estabilidade de Q-fibrados
Abstract: We present an introduction to the concepts of complex geometry necessary to the comprehension of the Hitchin-Kobayashi correspondence. We state and prove that every holomorphic vector bundle which admits a Hermite-Einstein connexion is polystable. Then, we discuss results regarding quiver bundles and state a Hitchin-Kobayashi correspondence for this case. Finally, we state and prove an author's result which relates the stability of vector bundles with the stability of quiver bundles
Mestrado
Geometria Diferencial
Mestre em Matemática
2
Beck, Florian [Verfasser], Emanuel [Akademischer Betreuer] Scheidegger, and Katrin [Akademischer Betreuer] Wendland. "Hitchin and calabi-yau integrable systems." Freiburg : Universität, 2016. http://d-nb.info/1125905840/34.
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Cazanave, Christophe. "Théorie homotopique des schémas d'Atiyah et Hitchin." Phd thesis, Université Paris-Nord - Paris XIII, 2009. http://tel.archives-ouvertes.fr/tel-00463680.
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Ce travail introduit la notion de schéma d'Atiyah et Hitchin. Une variété algébrique raisonnable Y étant fixée, il s'agit d'une famille de nouveaux schémas, indexée par un entier positif m et notée $R_m(Y)$. Nous étudions les propriétés homotopiques de ces « espaces » au sens de Morel et Voevodsky. Les schémas $F_m$ des fractions rationnelles pointées de degré m constituent un exemple fondateur et fondamental. Du point de vue topologique, les travaux de G. Segal et F. Cohen et al. montrent que l'espace $F_m(C)$ approxime l'espace de lacets $Ω^2 S^3$. Nous formulons une série précise de conjectures visant à généraliser ces résultats dans un cadre algébrique. Le schéma $R_m(Y)$ approximerait l'espace de lacets motivique $Ω^{P¹} Σ^{P¹} Y$. Nous obtenons plusieurs résultats dans cette direction. En particulier : 1) Nous déterminons l'ensemble des composantes connexes algébriques naïves du schéma de fractions rationnelles $F_m$, au-dessus d'un corps de base. Le calcul est simple et élémentaire. On retrouve, à une complétion près, le groupe des classes d'homotopie d'endomorphismes pointés de la droite projective $P¹$, tel que calculé par Morel. 2) Nous construisons un morphisme algébrique reliant $R_mY$ à $Ω^{P¹} Σ^{P¹} Y$. 3) Lorsque Y est une variété algébrique complexe, nous explicitons le type d'homotopie de l'espace topologique $R_m(Y)(C)$ comme un foncteur en $Y(C)$. De plus, nous montrons que l'espace $R_m(Y)(C)$ admet un scindement stable dont les facteurs sont ceux du scindement de Snaith de l'espace $Ω² Σ² Y (C)$.
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Kjiri, Mounia. "Systèmes de Hitchin généralisés et variétés symplectiques." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ52110.pdf.
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Rodrigues, Diego de Sousa. "Desigualdades de Hitchin-Thorpe e Miyaoka-Yau." reponame:Repositório Institucional da UFC, 2014. http://www.repositorio.ufc.br/handle/riufc/13243.
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RODRIGUES, Diego de Sousa. Desigualdades de Hitchin-Thorpe e Miyaoka-Yau. 2014.
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The aim of this work is to present a proof of the Hitchin-Thorpe and Miyaoka-Yau inequalities. First we provide an orthogonal decomposition for the curvature tensor, and then we show how the curvature operator can be defined from the curvature tensor. In order to fulfill the proposed objective, we prove the Gauss-Bonnet Theorem in dimension 4, to do this we use a result due Allendoerfer and we present an integral formula for the Euler characteristic computation on a Riemannian 4-manifold. Furthermore, we define the concept of signature in a Riemannian manifold e we exhibit an integral formula for the achievement of this object, for this we use the Hirzebruch Signature Theorem in di- mension 4 and the Chern-Weil Theory which provides us a connection between algebraic topology and differential geometry. Finally, we show how the earlier formulas can be used in the demonstration of the initial inequalities.
O objetivo desse trabalho é fornecer uma demonstraçao para as desigualdades de Hitchin-Thorpe e Miyaoka-Yau. Inicialmente forneceremos uma decomposição ortogonal para o tensor curvatura, em seguida mostraremos como o operador curvatura pode ser definido a partir do tensor curvatura. Com o intuito de cumprir o objetivo proposto, iremos provar o Teorema de Gauss-Bonnet em dimensão 4, para isso utilizaremos um resultado devido a Allendoerfer e forneceremos uma fórmula integral para o cálculo da característica de Euler de uma variedade Riemanniana de dimensão 4. Além disso, definiremos o conceito de assinatura em uma variedade Riemanniana e exibiremos uma fórmula integral para a obtenção deste objeto, para isso utilizaremos o Teorema de Assinatura de Hirzebruch em dimensão 4 e pouco da Teoria de Chern-Weil que nos fornece uma conexão entre a topologia algébrica e a geometria diferencial. Por fim, mostraremos como as fórmulas que foram obtidas podem ser utilizadas na demonstraçao das desigualdades citadas inicialmente.
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Pfahlert, Jeanine Ann. "THE SOCIOLOGICAL HITCH." Bowling Green State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1150841109.
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Horn, Johannes [Verfasser], and Daniele [Akademischer Betreuer] Alessandrini. "Singular fibers of Hitchin systems / Johannes Horn ; Betreuer: Daniele Alessandrini." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1219908290/34.
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Groechenig, Michael. "Autoduality of the Hitchin system and the geometric Langlands programme." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:f0a08e96-2f25-4df1-9e56-99931e411f73.
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This thesis is concerned with the study of the geometry and derived categories associated to the moduli problems of local systems and Higgs bundles in positive characteristic. As a cornerstone of our investigation, we establish a local system analogue of the BNR correspondence for Higgs bundles. This result (Proposition 4.3.1) relates flat connections to certain modules of an Azumaya algebra on the family of spectral curves. We prove properness over the semistable locus of the Hitchin map for local systems introduced by Laszlo–Pauly (Theorem 4.4.1). Moreover, we show that with respect to this Hitchin map, the moduli stack of local systems is étale locally equivalent to the moduli stack of Higgs bundles (Theorem 4.6.3) (with or without stability conditions). Subsequently, we study two-dimensional examples of moduli spaces of parabolic Higgs bundles and local systems (Theorem 5.2.1), given by equivariant Hilbert schemes of cotangent bundles of elliptic curves. Furthermore, the Hilbert schemes of points of these surfaces are equivalent to moduli spaces of parabolic Higgs bundles, respectively local systems (Theorem 5.3.1). The proof for local systems in positive characteristic relies on the properness results for the Hitchin fibration established earlier. The Autoduality Conjecture of Donagi–Pantev follows from Bridgeland–King–Reid’s McKay equivalence in these examples. The last chapter of this thesis is concerned with the con- struction of derived equivalences, resembling a Geometric Langlands Correspondence in positive characteristic, generalizing work of Bezrukavnikov–Braverman. Away from finitely many primes, we show that over the locus of integral spectral curves, the derived category of coherent sheaves on the stack of local systems is equivalent to a derived category of coherent D-modules on the stack of vector bundles. We conclude by establishing the Hecke eigenproperty of Arinkin’s autoduality and thereby of the Geometric Langlands equivalence in positive characteristic.
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Pearson, Paul James. "Modeling and validation of hitched loading effects on tractor yaw dynamics." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Theses/PEARSON_PAUL_30.pdf.
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Brownsell, Wendy Joan. "Middle Pleistocene till lithostratigraphy in south Bedfordshire and the Hitchin Gap." Thesis, University of Hertfordshire, 2009. http://hdl.handle.net/2299/3762.
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A revised lithostratigraphy and glacial history of north Hertfordshire and south Bedfordshire is based upon detailed textural data in the clay to fine gravel fraction, carbonate content, small clast lithological data and macrofabrics, derived from laboratory and field analyses of tills from 30 sites. These include four deep boreholes sunk within the Hitchin Gap. A range of statistical procedures was used, including multivariate analysis of the petrographic properties, enabling the identification of tills from two separate incursions into the Gap. A further till-type was identified in south Bedfordshire indicating an ice advance from the northwest/NNW extending at least as far east as Milton Bryan. Statistical comparison with tills in the neighbouring Vale of St. Albans suggested the presence of the Ware Member till within the Gap. Two hypotheses are suggested to explain variations in lithological content of tills north of the Chalk scarp. The first envisages ice entering the study area along the different trajectories suggested by Fish and Whiteman (2001). During the early part of the glaciation, ice reaching the west of the study area would approach from the north, crossing a shorter distance over Chalk bedrock and collecting less chalk and flint than ice moving into the eastern part of the study area. The second hypothesis invokes an incursion of ice from a northwest - NNW direction into the west of the study area, depositing a chalk-free till. This is subsequently assimilated by ice from the northeast, resulting in the final deposition of a homogeneous mixture of debris from the two advances, with a lower chalk content than tills found to the east. The outcome of either of these scenarios is a till with a low acid-soluble content and low flint/quartz ratio in the west of the study area, as found during this work. Within the Hitchin Gap, a lobe of ice, probably an early part of the northeasterly advance, deposited a lower till. This is considered to be earlier than the Ware Member till and has more variable lithological characteristics and a finer matrix that the higher tills. The latter are mainly melt-out, flow or slumped tills with occasional instances of lodgement and deformation. They represent in situ wasting of dead ice within the Gap. Surface tills in the Gap form a continuum with tills to the north and comprise mainly deformation tills, deposited by the final northeasterly re-advance of ice responsible for widespread coverage of the region, with the exception of the Chiltern Hills southwest of Hitchin. No evidence is found of more than one lithostratigraphic unit of till outside the Hitchin Gap.
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Figiel, Troy [Verfasser]. "Quantization of the Hitchin system from loop operator expectation values / Troy Figiel." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2020. http://d-nb.info/1229387226/34.
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Rollings-Magnusson, Sandra Lynn. "Hitched to the plow, the place of western pioneer women in Innisian staple theory." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq30548.pdf.
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Yarmola, Andrew. "Convex hulls in hyperbolic 3-space and generalized orthospectral identities." Thesis, Boston College, 2016. http://hdl.handle.net/2345/bc-ir:106788.
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Thesis advisor: Martin BridgemanWe begin this dissertation by studying the relationship between the Poincaré metric of a simply connected domain Ω ⊂ ℂ and the geometry of Dome(Ω), the boundary of the convex hull of its complement. Sullivan showed that there is a universal constant K[subscript]eq[subscript] such that one may find a conformally natural K[subscript]eq[subscript]-quasiconformal map from Ω to Dome(Ω) which extends to the identity on ∂Ω. Explicit upper and lower bounds on K[subscript]eq[subscript] have been obtained by Epstein, Marden, Markovic and Bishop. We improve upon these upper bounds by showing that one may choose K[subscript]eq[subscript] ≤ 7.1695. As part of this work, we provide stronger criteria for embeddedness of pleated planes. In addition, for Kleinian groups Γ where N = ℍ³/Γ has incompressible boundary, we give improved bounds for the average bending on the convex core of N and the Lipschitz constant for the homotopy inverse of the nearest point retraction. In the second part of this dissertation, we prove an extension of Basmajian's identity to n-Hitchin representations of compact bordered surfaces. For 3-Hitchin representations, we provide a geometric interpretation of this identity analogous to Basmajian's original result. As part of our proof, we demonstrate that for a closed surface, the Lebesgue measure on the Frenet curve of an n-Hitchin representation is zero on the limit set of any incompressible subsurface. This generalizes a classical result in hyperbolic geometry. In our final chapter, we prove the Bridgeman-Kahn identity for all finite volume hyperbolic n-manifolds with totally geodesic boundary. As part of this work, we correct a commonly referenced expression of the volume form on the unit tangent bundle of ℍⁿ in terms of the geodesic end point parametrization
Thesis (PhD) — Boston College, 2016
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Mathematics
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Freibert, Marco [Verfasser], and Vicente [Akademischer Betreuer] Cortés-Suárez. "Geometric structures on Lie algebras and the Hitchin flow / Marco Freibert. Betreuer: Vicente Cortés-Suárez." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2013. http://d-nb.info/1036729400/34.
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Freibert, Marco [Verfasser], and Vicente [Akademischer Betreuer] Cortés. "Geometric structures on Lie algebras and the Hitchin flow / Marco Freibert. Betreuer: Vicente Cortés-Suárez." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2013. http://d-nb.info/1036729400/34.
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Schaposnik, Laura P. "Spectral data for G-Higgs bundles." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:7b483c4c-53e4-4449-88c2-7a75d98ac861.
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We develop a new geometric method of understanding principal G-Higgs bundles through their spectral data, for G a real form of a complex Lie group. In particular, we consider the case of G a split real form, as well as G = SL(2,R), U(p,p), SU(p,p), and Sp(2p,2p). Further, we give some applications of our results, and discuss open questions.
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Thacker, Gary W., and Wayne E. Coates. "How the Quick Hitch Guidance Systems Work and Their Practical Applications." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/210864.
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Moretti, Talita Breda [UNESP]. "Diferenças no metabolismo das plantas que determinam resistência a herbicidas em Brachiaria plantaginea (Link) Hitchc." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/98814.
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A Brachiaria plantaginea está entre as espécies de maior ocorrência como plantas daninhas em diversas culturas. O objetivo do presente trabalho foi estudar as características morfofisiológicas da espécie B. plantaginea quanto à resistência a herbicidas. Os experimentos foram conduzidos no período de janeiro à agosto do ano de 2009 em casa de vegetação com as plantas em vasos plásticos pretos de 3,0 L contendo substrato Plantimax® e em laboratório de análises foram realizadas conforme cada exigência necessária realizadas.na Faculdade de Engenharia de Ilha Solteira – Campus II UNESP de Ilha Solteira. Foi usado delineamento experimental, sendo: teste de germinação, teste de vigor, transpiração em folhas destacadas hidratadas e estimativa da área foliar: fatorial de 2x2, sendo duas massas de sementes e dois biótipos de B. plantaginea (susceptível e resistente a herbicidas), e o teste de seletividade dos materiais aos herbicidas: fatorial de 2x3, sendo dois biótipos (susceptível e resistente a herbicidas),dois herbicidas (ametrina, imazapic) e uma testemunha sem herbicida. Observou-se que tanto a massa das sementes como o caráter resistência ao herbicida influenciaram no comportamento morfofisiológico da espécie B. plantaginea. Sementes com massas maiores apresentaram maiores respostas de germinação, mesmo após um período de envelhecimento da semente. O cultivar resistente apresentou menor desenvolvimento em relação às plantas susceptíveis, sendo um fator importante em se tratando de uma eliminação de plantas daninhas. Plantas de Brachiaria plantaginea resistente possuem maior transpiração apenas nas primeiras seis horas dificultando a eliminação por herbicida. O herbicida imazapic controlou o biótipo susceptível mesmo após a uma aplicação de pós-emergência. O biótipo resistente possui um maior transporte de elétrons podendo ser este o seu fator de resistência em relação ao biótipo susceptível
Brachiaria plantaginea is among the most common species as weeds in many cultures. The objective of this work was to study the morphological and physiological characteristics of species B. plantaginea for resistance to herbicides. The experiments were conducted from January to August of 2009 in a greenhouse with plants grown in pots of 3.0 L black plastic substrate Plantimax ® and in laboratory tests were performed according to each requirement necessary in Faculdade de Engenharia de Ilha Solteira – Campus II UNESP de Ilha Solteira. Experimental design was used, with a germination test, vigor test, transpiration in detached leaves hydrated and estimation of leaf area: 2x2 factorial, with two masses of seed and two biotypes of B. plantaginea (susceptible and resistant to herbicides), and test materials to the selectivity of herbicides: 2x3 factorial, two biotypes (susceptible and resistant to herbicides), two herbicides (ametryne imazapic) and no herbicide. It was observed that both seed mass as the character resistance to herbicide influence the behavior of the species B. plantaginea morphophysiological. Seeds with larger masses showed higher germination responses, even after an aging period of the seed. The resistant cultivar showed less developed compared to susceptible plants being an important factor when it comes to removing a weed. Brachiaria plantaginea resistant have a higher transpiration only for six hours making it difficult to eliminate by the herbicide. The imazapic controlled biotype likely even after the application of a post-emergence. The resistant biotype has a higher electron transport and this may be your resistance factor relative to susceptible biotype
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Moretti, Talita Breda. "Diferenças no metabolismo das plantas que determinam resistência a herbicidas em Brachiaria plantaginea (Link) Hitchc /." Ilha Solteira: [s.n.], 2011. http://hdl.handle.net/11449/98814.
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Resumo: A Brachiaria plantaginea está entre as espécies de maior ocorrência como plantas daninhas em diversas culturas. O objetivo do presente trabalho foi estudar as características morfofisiológicas da espécie B. plantaginea quanto à resistência a herbicidas. Os experimentos foram conduzidos no período de janeiro à agosto do ano de 2009 em casa de vegetação com as plantas em vasos plásticos pretos de 3,0 L contendo substrato Plantimax® e em laboratório de análises foram realizadas conforme cada exigência necessária realizadas.na Faculdade de Engenharia de Ilha Solteira - Campus II UNESP de Ilha Solteira. Foi usado delineamento experimental, sendo: teste de germinação, teste de vigor, transpiração em folhas destacadas hidratadas e estimativa da área foliar: fatorial de 2x2, sendo duas massas de sementes e dois biótipos de B. plantaginea (susceptível e resistente a herbicidas), e o teste de seletividade dos materiais aos herbicidas: fatorial de 2x3, sendo dois biótipos (susceptível e resistente a herbicidas),dois herbicidas (ametrina, imazapic) e uma testemunha sem herbicida. Observou-se que tanto a massa das sementes como o caráter resistência ao herbicida influenciaram no comportamento morfofisiológico da espécie B. plantaginea. Sementes com massas maiores apresentaram maiores respostas de germinação, mesmo após um período de envelhecimento da semente. O cultivar resistente apresentou menor desenvolvimento em relação às plantas susceptíveis, sendo um fator importante em se tratando de uma eliminação de plantas daninhas. Plantas de Brachiaria plantaginea resistente possuem maior transpiração apenas nas primeiras seis horas dificultando a eliminação por herbicida. O herbicida imazapic controlou o biótipo susceptível mesmo após a uma aplicação de pós-emergência. O biótipo resistente possui um maior transporte de elétrons podendo ser este o seu fator de resistência em relação ao biótipo susceptívelAbstract: Brachiaria plantaginea is among the most common species as weeds in many cultures. The objective of this work was to study the morphological and physiological characteristics of species B. plantaginea for resistance to herbicides. The experiments were conducted from January to August of 2009 in a greenhouse with plants grown in pots of 3.0 L black plastic substrate Plantimax ® and in laboratory tests were performed according to each requirement necessary in Faculdade de Engenharia de Ilha Solteira - Campus II UNESP de Ilha Solteira. Experimental design was used, with a germination test, vigor test, transpiration in detached leaves hydrated and estimation of leaf area: 2x2 factorial, with two masses of seed and two biotypes of B. plantaginea (susceptible and resistant to herbicides), and test materials to the selectivity of herbicides: 2x3 factorial, two biotypes (susceptible and resistant to herbicides), two herbicides (ametryne imazapic) and no herbicide. It was observed that both seed mass as the character resistance to herbicide influence the behavior of the species B. plantaginea morphophysiological. Seeds with larger masses showed higher germination responses, even after an aging period of the seed. The resistant cultivar showed less developed compared to susceptible plants being an important factor when it comes to removing a weed. Brachiaria plantaginea resistant have a higher transpiration only for six hours making it difficult to eliminate by the herbicide. The imazapic controlled biotype likely even after the application of a post-emergence. The resistant biotype has a higher electron transport and this may be your resistance factor relative to susceptible biotype
Orientador: Fernando Tadeu de Carvalho
Coorientador: Pedro Jacob Christoffoleti
Banca: Edson Lazarini
Banca: Francisco de Assis Rolim Pereira
Mestre
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Miteche, Sacha Patrick. "A mobile phone solution for ad-hoc hitch-hiking in South Africa." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013340.
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The purpose of this study was to investigate the use of mobile phones in organizing ad-hoc vehicle ridesharing based on hitch-hiking trips involving private car drivers and commuters in South Africa. A study was conducted to learn how hitch-hiking trips are arranged in the urban and rural areas of the Eastern Cape. This involved carrying out interviews with hitch-hikers and participating in several trips. The study results provided the design specifications for a Dynamic Ridesharing System (DRS) tailor-made to the hitch-hiking culture of this context. The design of the DRS considered the delivery of the ad-hoc ridesharing service to the anticipated mobile phones owned by people who use hitch-hiking. The implementation of the system used the available open source solutions and guidelines under the Siyakhula Living Lab project, which promotes the use of Information and Communication Technology (ICT) in marginalized communities of South Africa. The developed prototype was tested in both the simulated and live environments, then followed by usability tests to establish the viability of the system. The results from the tests indicate an initial breakthrough in the process of modernizing the ad-hoc ridesharing of hitch-hiking which is used by a section of people in the urban and rural areas of South Africa.
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Reddick, Bridget Louise. ""Hitched to a Steam Engine": Marriage and Crises of Gender at Park Church in Nineteenth-Century Elmira, New York." W&M ScholarWorks, 2002. https://scholarworks.wm.edu/etd/1539626374.
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Jiang, Philip Yuan-Zheng. "Analysis of the processing body subunits Winnebago and Trailer Hitch in Drosophila melanogaster." Diss., [La Jolla] : University of California, San Diego, 2010. http://wwwlib.umi.com/cr/ucsd/fullcit?p1474755.
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Thesis (M.S.)--University of California, San Diego, 2010.Title from first page of PDF file (viewed April 14, 2010). Available via ProQuest Digital Dissertations. Includes bibliographical references (p. 39-42).
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Murray, Susan Dorrit. ""Hitch your antenna to the stars!" : early television and the renegotiation of broadcast stardom /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
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Ton, That Quang. "Plantes antipaludiques du Vietnam : Wedelia trilobata (L.) Hitch. (Ateraceae) Tiliacora triandra (Roxb.) Diels (Menispermaceae)." Paris, Muséum national d'histoire naturelle, 2008. http://www.theses.fr/2008MNHN0007.
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Le paludisme est un problème de santé majeur qui touche plus de 40% de la population mondiale, avec plus de 300 millions de cas clinique par an et une mortalité annuelle de deux millions de personnes, surtout de jeunes enfants. On assiste à une recrudescence dramatique de cette parasitose, due principalement à l’émergence de résistance de l’agent pathogène, le Plasmodium, aux médicaments antipaludiques disponibles. Une telle situation nécessite un développement urgent de nouveaux médicaments. Les plantes médicinales sont un réservoir de molécules aux propriétés biologiques encore peu explorées qui peuvent constituer des molécules « leader » pour la définition de nouveaux antipaludiques, comme l’illustre la quinine et l’artémisinine, deux substances naturelles majeures dans l’histoire de la chimiothérapie du paludisme. On estime qu’actuellement 80% de la population mondiale utilisent des plantes pour les soins médicaux primaires et 60 % de ces plantes sont utilisées pour le traitement de maladies infectieuses comme les maladies tropicales. Au cours de ce travail de thèse, plusieurs plantes utilisées dans la médecine traditionnelle vietnamienne pour soigner les fièvres et le paludisme ont été évaluées pour leurs activités antipaludiques in vitro contre Plasmodium falciparum. Une étude phytochimique a été réalisée sur deux des plantes actives contre le parasite afin d’en identifier les principes actifs. 1) Wedelia trilobata (L. ) Hitchc. (Asteraceae) : Neuf composés actifs contre P. Falciparum ont été isolés des feuilles de cette plante et leurs structures déterminées. Deux sont des composés déjà identifiés appartenant à la famille des sesquiterpène γ-lactones. Les sept autres sont des composés originaux, ils présentent un nouveau squelette chimique sesquiterpène δ-lactones, (9R)-eudesman-9,12-olides, nous les avons nommés wédélolides. Le composé majeur, le wédélolide A, inhibe de 80% le développement parasitaire à la dose de 80 mg/kg chez la souris infectée par Plasmodium berghei ANKA. Le potentiel thérapeutique des wédélolides purifiés est cependant limité car ils présentent une toxicité in vitro sur cellules humaines et in vivo chez la souris. 2) Tiliacora triandra (Roxb. ) Diels (Menispermaceae): Huit composés ont été isolés des racines de cette plante et leurs structures déterminées: six bisbenzylisoquinoléines, une benzylisoquinoléine et une aporphine. Ces composés sont déjà connus, mais pour quatre d’entre eux, c’est la première fois qu’ils sont identifiés chez T. Triandra. Les bisbenzylisoquinoléines présentent une forte activité antipaludique in vitro mais associée à une cytotoxicité. Ils possèdent cependant un index thérapeutique plus intéressant que celui des wédélolides. Pour ces deux plantes, plusieurs autres composés minoritaires prometteurs ont été isolés associant une forte activité antipaludique et une faible cytotoxicité. Les quantités obtenues étaient cependant insuffisantes pour déterminer leurs structuresActually, malaria is still a major problem of public health with 40% of the world population and 300 millions of clinical cases per year with an annual mortality of 2 millions persons specially among the young children. The dramatical increase of the resistance of Plasmodium to the antimalarial drugs available led to an urgent research of new antimalarial drugs. The medicinal plants have played a important role and aways walk side by side in history of the malaria. Viet Nam is one of the countries which have high ratio of malarial resistance (R3). There are many traditional medicinal plants which were used for malarial treatment. By that bases, some vietnamese traditional medicinal plants were harvested to be used in this thesis. 1. The plant Wedelia trilobata (L. ) Hitchc. (Asteraceae) Nine compounds, including two old and seven new one, were isolated from the leaves. Two old compounds are kind of sesquiterpene γ-lactones and seven new compounds are kind of sesquiterpene δ-lactones, (9R)-eudesman-9,12-olides that were named wedelolides. All new compounds have antimalarial activities in vitro higher than two old compounds. Seven new compounds presented a cytotoxicity on MRC5 cells. The major compound wedelolide A (WT8) was tested in vivo on Swiss female mice, infected by Plasmodium berghei ANKA 65 strain according to the Peters’s test and the inhibition at dose 80 mg/kg is around 80,0 % at J3. 2. The plant Tiliacora triandra (Roxb. ) Diels (Menispermaceae) Eight compounds were isolated from the roots. Six compounds are kind of bisbenzylisoquinolines (BBIQ), one of benzylisoquinoline (BIQ) and one of aporphine (APORPHIN). All compounds are old but four of them are isolated from the roots of T. Triandra for the first time (A3, F4F7A, LHA9 and A6). The BBIQs have antimalarial activities in vitro higher than BIQ and APORPHIN. The BBIQs are toxic according to the cytotoxic test in vitro on MRC5 cells. The antimalarial test in vivo of the BBIQs and methanol extract showed remarkable results
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Gallian, Sara [Verfasser], Ralf Peter [Akademischer Betreuer] Brinkmann, and William Nicholas G. [Akademischer Betreuer] Hitchon. "Analytic and numerical investigation of high power impulse magnetron sputtering discharges / Sara Gallian. Gutachter: Ralf Peter Brinkmann ; William Nicholas G. Hitchon." Bochum : Ruhr-Universität Bochum, 2015. http://d-nb.info/1079843051/34.
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Baraglia, David. "G2 geometry and integrable systems." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:30cf9c7c-157e-4204-b68b-08f6e199ef36.
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We study the Hitchin component in the space of representations of the fundamental group of a Riemann surface into a split real Lie group in the rank 2 case. We prove that such representations are described by a conformal structure and class of Higgs bundle we call cyclic and we show cyclic Higgs bundles correspond to a form of the affine Toda equations. We also relate various real forms of the Toda equations to minimal surfaces in quadrics of arbitrary signature. In the case of the Hitchin component for PSL(3,R) we provide a new proof of the relation to convex RP²-structures and hyperbolic affine spheres. For PSp(4,R) we prove such representations are the monodromy for a special class of projective structure on the unit tangent bundle of the surface. We prove these are isomorphic to the convex-foliated projective structures of Guichard and Wienhard. We elucidate the geometry of generic 2-plane distributions in 5 dimensions, work which traces back to Cartan. Nurowski showed that there is an associated signature (2,3) conformal structure. We clarify this as a relationship between a parabolic geometry associated to the split real form of G₂ and a conformal geometry with holonomy in G₂. Moreover in terms of the conformal geometry we prove this distribution is the bundle of maximal isotropics corresponding to the annihilator of a spinor satisfying the twistor-spinor equation. The moduli space of deformations of a compact coassociative submanifold L in a G₂ manifold is shown to have a natural local embedding as a submanifold of H2(L,R). We consider G2-manifolds with a T^4-action of isomorphisms such that the orbits are coassociative tori and prove a local equivalence to minimal 3-manifolds in R^{3,3} = H²(T⁴,R) with positive induced metric. By studying minimal surfaces in quadrics we show how to construct minimal 3-manifold cones in R^{3,3} and hence G₂-metrics from equations that are a set of affine Toda equations. The relation to semi-flat special Lagrangian fibrations and the Monge-Ampere equation is explained.
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Rodrigues, Andréia Cristina Peres [UNESP]. "Aspectos qualitativos e quantitativos em pulverização na cultura do amendoim e Brachiaria plantaginea (Link) Hitch." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/99929.
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rodrigues_acp_dr_botfca.pdf: 1795519 bytes, checksum: 01aaad09fd46e8ad27dfbe72f219e641 (MD5)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Objetivou-se avaliar a quantidade e qualidade da deposição da calda de pulverização em duas cultivares de amendoim (Aracahis hypogaea L.) e na planta daninha Brachiaria plantaginea (Link) Hitch., presente na linha e entrelinhas de semeadura da cultura, além da deposição no solo, em aplicações de pós-emergência. O estudo foi realizado a campo com duas cultivares de amendoim (‘IAC Tatu-ST’ e ‘Runner IAC 886’), sendo as aplicações dos tratamentos realizadas nos estádios vegetativo (V1) e reprodutivo (R2). Foi utilizado como marcador o corante Azul Brilhante FDC -1 na concentração de 500 ppm. Os tratamentos foram constituídos por sete pontas de pulverização: XR 110015 VS (150 L ha-1), XR 11002 VS (200 L ha-1), TX-VK 6 (150L ha-1), TX-VK 8 (200 L ha-1), AI 110015 VS (150 L ha-1), AI11002 VS (200 L ha-1) e TJ60 11002 VS (150 e 200 L ha-1). Utilizou-se o delineamento em blocos ao acaso, com 4 repetições. Os dados dos resultados quantitativos de deposição foram analisados nos seguintes esquemas em fatorial: para os depósitos em plantas de amendoim foi utilizado o esquema 8 x 2 (8 situações de pulverização x 2 estádio de desenvolvimento da cultura); para as plantas daninhas presentes na linha e na entrelinha da cultura do amendoim, o esquema foi 8 x 2 [8 situações de pulverização x 2 posições (linha e entrelinha)]; para as estimativas de deposição no solo, o esquema foi 8 x 2 [8 situações de pulverização x 2 posições (linha e entrelinha)]. Foram amostradas 25 plantas por repetição em cada parcela, tanto para as plantas de amendoim quanto para as plantas daninhas presentes na linha e na entrelinha da cultura. Após a aplicação, as plantas foram imediatamente coletadas, e em seguida foram lavadas em 100 mL de água destilada para posterior quantificação do marcador em espectrofotômetro. Para as análises qualitativas, cada planta selecionada...
The objective of this study was to evaluate the quantity and quality of the spray deposition in two peanut cultivars (Aracahis hypogaea L.) and weed Brachiaria plantaginea (Link) Hitch., current in the crop row and spacing row, beyond the deposition in soil, in applications of post-emergency. The study was conducted in the field with two peanut cultivars (‘IAC Tatu-ST’ e ‘Runner IAC 886’), and the applications of treatments performed in the vegetative stage (V1) and reproductive (R2). It was used the Brilliant Blue FDC – 1 as tracer in water solution, at 500 ppm. The treatments consisted of seven spray nozzle XR 110015 VS (150 L ha-1), XR 11002 VS (200 L ha-1), TX-VK 6 (150L ha-1), TX-VK 8 (200 L ha-1), AI 110015 VS (150 L ha-1), AI11002 VS (200 L ha-1) e TJ60 11002 VS (150 e 200 L ha1). It was used a randomized blocks design, with four replications. Being that, the results of the quantitative data of deposition had been analyzed in following factorial schemes: for the deposits in peanut plants was used 8 x 2 factorial scheme (8 situations spray x stage of development of culture), for the Brachiaria plantaginea plants was used 8 x 2 factorial scheme [8 situations spray x 2 positions (row and spacing row)]; for the soil deposition estimates, the factorial scheme was 8 x 2 [8 situations spray x 2 positions (row and spacing row)]. Were sampled 25 plants for replication in each plot, as much for the peanut plants as current weeds in crop row and spacing row. After application, the plants were immediately collected, and after they had been washed in 100 mL of distilled water for tracer remover. The tracer quantification was made in spectrophotometer. For the quantitative analysis, each random selected plant inside of boom application stripe bar was considered a replication, representing a total of 100 replications. The obtained data had been adjusted a regression curve for Gompertz... (Complete abstract click electronic access below)
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Rodrigues, Andréia Cristina Peres 1978. "Aspectos qualitativos e quantitativos em pulverização na cultura do amendoim e Brachiaria plantaginea (Link) Hitch /." Botucatu : [s.n.], 2010. http://hdl.handle.net/11449/99929.
Full textAbstract:
Orientador: Dagoberto MartinsBanca: Carlos Gilberto Raetano
Banca: Maurício Dutra Zanotto
Banca: Marcelo da Costa Ferreira
Banca: Fernando Tadeu de Carvalho
Resumo: Objetivou-se avaliar a quantidade e qualidade da deposição da calda de pulverização em duas cultivares de amendoim (Aracahis hypogaea L.) e na planta daninha Brachiaria plantaginea (Link) Hitch., presente na linha e entrelinhas de semeadura da cultura, além da deposição no solo, em aplicações de pós-emergência. O estudo foi realizado a campo com duas cultivares de amendoim ('IAC Tatu-ST' e 'Runner IAC 886'), sendo as aplicações dos tratamentos realizadas nos estádios vegetativo (V1) e reprodutivo (R2). Foi utilizado como marcador o corante Azul Brilhante FDC -1 na concentração de 500 ppm. Os tratamentos foram constituídos por sete pontas de pulverização: XR 110015 VS (150 L ha-1), XR 11002 VS (200 L ha-1), TX-VK 6 (150L ha-1), TX-VK 8 (200 L ha-1), AI 110015 VS (150 L ha-1), AI11002 VS (200 L ha-1) e TJ60 11002 VS (150 e 200 L ha-1). Utilizou-se o delineamento em blocos ao acaso, com 4 repetições. Os dados dos resultados quantitativos de deposição foram analisados nos seguintes esquemas em fatorial: para os depósitos em plantas de amendoim foi utilizado o esquema 8 x 2 (8 situações de pulverização x 2 estádio de desenvolvimento da cultura); para as plantas daninhas presentes na linha e na entrelinha da cultura do amendoim, o esquema foi 8 x 2 [8 situações de pulverização x 2 posições (linha e entrelinha)]; para as estimativas de deposição no solo, o esquema foi 8 x 2 [8 situações de pulverização x 2 posições (linha e entrelinha)]. Foram amostradas 25 plantas por repetição em cada parcela, tanto para as plantas de amendoim quanto para as plantas daninhas presentes na linha e na entrelinha da cultura. Após a aplicação, as plantas foram imediatamente coletadas, e em seguida foram lavadas em 100 mL de água destilada para posterior quantificação do marcador em espectrofotômetro. Para as análises qualitativas, cada planta selecionada... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The objective of this study was to evaluate the quantity and quality of the spray deposition in two peanut cultivars (Aracahis hypogaea L.) and weed Brachiaria plantaginea (Link) Hitch., current in the crop row and spacing row, beyond the deposition in soil, in applications of post-emergency. The study was conducted in the field with two peanut cultivars ('IAC Tatu-ST' e 'Runner IAC 886'), and the applications of treatments performed in the vegetative stage (V1) and reproductive (R2). It was used the Brilliant Blue FDC - 1 as tracer in water solution, at 500 ppm. The treatments consisted of seven spray nozzle XR 110015 VS (150 L ha-1), XR 11002 VS (200 L ha-1), TX-VK 6 (150L ha-1), TX-VK 8 (200 L ha-1), AI 110015 VS (150 L ha-1), AI11002 VS (200 L ha-1) e TJ60 11002 VS (150 e 200 L ha1). It was used a randomized blocks design, with four replications. Being that, the results of the quantitative data of deposition had been analyzed in following factorial schemes: for the deposits in peanut plants was used 8 x 2 factorial scheme (8 situations spray x stage of development of culture), for the Brachiaria plantaginea plants was used 8 x 2 factorial scheme [8 situations spray x 2 positions (row and spacing row)]; for the soil deposition estimates, the factorial scheme was 8 x 2 [8 situations spray x 2 positions (row and spacing row)]. Were sampled 25 plants for replication in each plot, as much for the peanut plants as current weeds in crop row and spacing row. After application, the plants were immediately collected, and after they had been washed in 100 mL of distilled water for tracer remover. The tracer quantification was made in spectrophotometer. For the quantitative analysis, each random selected plant inside of boom application stripe bar was considered a replication, representing a total of 100 replications. The obtained data had been adjusted a regression curve for Gompertz... (Complete abstract click electronic access below)
Doutor
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Passini, Telma. "Competividade e predição de perdas de rendimento da cultura de feijão quando em convivência com Brachiaria plantaginea (Link) Hitchc." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/11/11136/tde-08042002-102310/.
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A predição de perdas de rendimento de uma cultura devido à interferência de plantas daninhas é fundamental para o planejamento e seleção de estratégias de manejo das plantas daninhas na agricultura. Diversos modelos empíricos foram descritos na literatura porém, há necessidade de validá-los e escolher variáveis que possam ser avaliadas de modo prático, sem reduzir a precisão da predição de perda de rendimento da cultura. Os objetivos foram os de avaliar a competitividade da cultura de feijão (Phaseolus vulgaris L.) em relação à planta daninha [Brachiaria plantaginea (Link) Hitchc.]; comparar a eficiência de modelos empíricos em predizer perdas de rendimento da cultura em que a variável independente descreve a população de plantas daninhas em termos de densidade, índice de área foliar relativa e cobertura relativa do solo e propor uma metodologia para estimar os coeficientes dos modelos avaliados. Os experimentos foram conduzidos na Universidade de São Paulo (USP), na Escola Superior de Agricultura 'Luiz de Queiroz' (ESALQ), no Departamento de Produção Vegetal, em Piracicaba/SP, Brasil. Em casa de vegetação, avaliou-se a resposta de cada espécie à sua própria densidade, determinando-se a densidade mínima de plantas a partir da qual a produção de massa vegetal/unidade de área torna-se independente da densidade e a resposta de cada uma em relação à presença da outra em diferentes densidades e proporções. No campo, avaliou-se a perda de rendimento da cultura devido à densidade e à época de emergência da planta daninha, simulada por diferentes datas de semeadura do capim-marmelada. Em casa de vegetação, o feijão, como espécie competidora, é superior ao capim-marmelada; considerando o efeito da competição sobre a massa seca produzida pela cultura, uma planta de feijão competiu com outra da mesma espécie com a intensidade de 21,3 plantas de capim-marmelada e, o efeito da competição sobre a massa seca produzida pela planta daninha, uma planta de capim-marmelada competiu com outra da mesma espécie com a intensidade de 0,68 plantas de feijão; há diferenciação parcial de nicho ecológico entre as espécies, isto é, ambas utilizam os mesmos recursos do meio mas o feijão evita a presença do capim-marmelada. No campo, o capim-marmelada, como espécie competidora, é superior ao feijão; a perda de rendimento diminui com o atraso na semeadura da planta daninha; o modelo que tem como variável a densidade da planta daninha não descreve a perda de rendimento da cultura causada pela época de semeadura da planta daninha mas aqueles cuja variável é o índice relativo da área foliar da planta daninha ou a cobertura relativa do solo pela planta daninha descrevem; a cobertura relativa do solo pela planta daninha, avaliada visualmente, é uma variável potencial para substituir o índice de área foliar relativa da planta daninha; com o método completo, proposto para estimar os coeficientes dos modelos, obtém-se melhor predição de perdas de rendimento da cultura do que com o método simplificado.The prediction of crop yield losses due to weed infestation is fundamental for the selection of weed management strategies. Several empirical models have been presented in the literature. However, it is necessary to validate them and choose variables, which can be evaluated in more practical way without reducing the precision of the crop yield loss prediction. The goals of this study were to assess the competitive ability of bean (Phaseolus vulgaris L.) relative to the weed alexandergrass [Brachiaria plantaginea (Link) Hitchc.]; to compare the performance of empirical models on predicting crop yield loss based on weed density, weed relative leaf area index and weed relative ground cover and, to suggest a methodology to estimate the coefficients of the tested empirical models. The experiments were carried out at University of São Paulo (USP), Escola Superior de Agricultura 'Luiz de Queiroz' (ESALQ), in the Department of Crop Production, in Piracicaba, São Paulo State, Brazil. With the glasshouse experiments the response of the species to its own density and, the response of the species to the presence of each other at different densities and proportion between them was assessed. With the field experiment, the crop yield loss, due to weed density and weed emergence relative to the crop emergence, simulated by sowing the weed at different time, was assessed. In the glasshouse experiments, as a competitor species, bean is superior to alexandergrass; the competition as measured by effects on bean biomass, one plant of bean is, to another plant of the same species, competitively equivalent to 21,3 alexandergrass plants and, as measured by effects on alexandergrass biomass, one alexandergrass plant is, to another plant of the same species, equivalent to 0,68 plant of bean; there is partial niche differentiation; the species compete for the same resources however, bean plants avoid the alexandergrass presence. In the field experiment, alexandergrass as a competitor species is superior to bean; crop yield losses decreased with the weed sowing delay; the model which variable is the weed density does not predict de crop yield loss due the relative time of weed sowing however, those models which variable is the weed relative leaf area index or weed relative ground cover, visually estimated, do; the visually estimated weed ground cover is a potential variable to substitute for the weed relative leaf area index; the suggested advanced method for estimating the models coefficients predicts the crop yield loss better than the simple method.
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Domingos, Vanessa David [UNESP]. "Crescimento de Brachiaria subquadripara (Trin.) Hitchc. sob diferentes condições nutricionais e monitoramento sazonal de fatores ambientais no habitat natural." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/99961.
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domingos_vd_dr_botfca.pdf: 881718 bytes, checksum: 163d5eca87ea73603bb65511b1b32209 (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Este estudo teve como objetivo avaliar o crescimento e caracterizar o ambiente de ocorrência de Brachiaria subquadripara, sendo constituído de três etapas: (i) avaliar a população e os fatores abióticos presentes no reservatório de Barra Bonita em duas épocas (seca e águas); (ii) seleção da solução nutritiva (solução base) favorável ao crescimento a partir de diferentes diluições (80, 60, 40, 20 e 0%) da solução nutritiva completa de Sarruge em casa-de-vegetação e (iii) avaliar o crescimento e absorção de nutrientes sob o efeito de diferentes concentrações (0, 25, 50, 75 e 100%) de N, P e K na solução base em casa-devegetação. As coletas foram realizadas nos dias 06/07/2004 e 14/01/2005 em pontos previamente selecionados e georreferenciados, os quais constituíram-se de 13 pontos no reservatório Barra Bonita (7 pontos no braço do rio Piracicaba e 6 pontos no braço do rio Tietê). Foram realizadas coletas de solo, sedimento, água e plantas. A distribuição em relação à área de infestação das populações de B. subquadripara foi considerada heterogenia entre os pontos amostrados no reservatório de Barra Bonita, principalmente no verão referente à 2ª época. A diluição de 20% da solução nutritiva propiciou melhores condições ao desenvolvimento da planta e foi considerada representativa para ser utilizada como solução base destinada à aplicação dos diferentes níveis de N, P e K. A variação sazonal influenciou na distribuição das populações, a qual ocorreu de forma heterogênea na estação chuvosa em relação à densidade populacional. O Rio Tietê foi considerado um ambiente mais eutrófico do que o Rio Piraracicaba tanto em relação ao solo quanto em relação à coluna d água. O crescimento de B. subquadripara apresentou melhor ajuste aos modelos exponencial e linear, sendo obtidos coeficientes...
The objective of this work was to evaluate the growth and characterize the occurrence environment of Brachiaria subquadripara being consisted of three stages: (i) evaluate the population and the abiotic factors present in the reservoir of Barra Bonita in two seasons (drought and waters); (ii) selection of nutritious solution (base solution) favorable to growth from different dilutions (80, 60, 40, 20 and 0%) of Sarruge s complete nutritious solution, at green house and (iii) evaluate the growth and nutrients absorption under the effect of different N, P and K concentrations (0, 25, 50, 75 and 100%) in the base solution, at green house. Collections were carried out in July 6, 2004 and January, 14, 2005, in previously selected and georeferred places, which consisted of 13 places at Barra Bonita reservoir (7 places in the branch of the Piracicaba River and 6 places in the branch of the Tietê River). Soil, sediment, water and plants collections were carried out in each place. The distribution in relation to infestation area of B. subquadripara populations was considered heterogeneous among the places chosen in the Barra Bonita reservoir, mainly in the summer of the 2nd season. The 20% dilution of nutritious solution allowed better conditions for plant development and was considered significant to be used as base solution destined to the application of different levels 4 of N, P and K. Seasonal variation influenced the populations distribution, which heterogeneously occurred in the rainy season, in relation to population density. The Tietê River was considered the most eutrophic environment than the Piracicaba river, in relation to both soil and water column. B. subquadripara growth presented better adjustment to exponential and linear models, with determination coefficients above 90% and probability of 0,001 to 0,05. The absence of nitrogen affected the foliaceous area... (Complete abstract click electronic access below)
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Domingos, Vanessa David 1978. "Crescimento de Brachiaria subquadripara (Trin.) Hitchc. sob diferentes condições nutricionais e monitoramento sazonal de fatores ambientais no habitat natural /." Botucatu : [s.n.], 2007. http://hdl.handle.net/11449/99961.
Full textAbstract:
Orientador: Dagoberto MartinsBanca: Robinson Antonio Pitelli
Banca: Eduardo Andrea Lemus Erasmo
Banca: Mario Sergio Tomazela
Banca: Sidnei Roberto de Marchi
Resumo: Este estudo teve como objetivo avaliar o crescimento e caracterizar o ambiente de ocorrência de Brachiaria subquadripara, sendo constituído de três etapas: (i) avaliar a população e os fatores abióticos presentes no reservatório de Barra Bonita em duas épocas (seca e águas); (ii) seleção da solução nutritiva (solução base) favorável ao crescimento a partir de diferentes diluições (80, 60, 40, 20 e 0%) da solução nutritiva completa de Sarruge em casa-de-vegetação e (iii) avaliar o crescimento e absorção de nutrientes sob o efeito de diferentes concentrações (0, 25, 50, 75 e 100%) de N, P e K na solução base em casa-devegetação. As coletas foram realizadas nos dias 06/07/2004 e 14/01/2005 em pontos previamente selecionados e georreferenciados, os quais constituíram-se de 13 pontos no reservatório Barra Bonita (7 pontos no braço do rio Piracicaba e 6 pontos no braço do rio Tietê). Foram realizadas coletas de solo, sedimento, água e plantas. A distribuição em relação à área de infestação das populações de B. subquadripara foi considerada heterogenia entre os pontos amostrados no reservatório de Barra Bonita, principalmente no verão referente à 2ª época. A diluição de 20% da solução nutritiva propiciou melhores condições ao desenvolvimento da planta e foi considerada representativa para ser utilizada como solução base destinada à aplicação dos diferentes níveis de N, P e K. A variação sazonal influenciou na distribuição das populações, a qual ocorreu de forma heterogênea na estação chuvosa em relação à densidade populacional. O Rio Tietê foi considerado um ambiente mais eutrófico do que o Rio Piraracicaba tanto em relação ao solo quanto em relação à coluna dágua. O crescimento de B. subquadripara apresentou melhor ajuste aos modelos exponencial e linear, sendo obtidos coeficientes... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The objective of this work was to evaluate the growth and characterize the occurrence environment of Brachiaria subquadripara being consisted of three stages: (i) evaluate the population and the abiotic factors present in the reservoir of Barra Bonita in two seasons (drought and waters); (ii) selection of nutritious solution (base solution) favorable to growth from different dilutions (80, 60, 40, 20 and 0%) of Sarruges complete nutritious solution, at green house and (iii) evaluate the growth and nutrients absorption under the effect of different N, P and K concentrations (0, 25, 50, 75 and 100%) in the base solution, at green house. Collections were carried out in July 6, 2004 and January, 14, 2005, in previously selected and georeferred places, which consisted of 13 places at Barra Bonita reservoir (7 places in the branch of the Piracicaba River and 6 places in the branch of the Tietê River). Soil, sediment, water and plants collections were carried out in each place. The distribution in relation to infestation area of B. subquadripara populations was considered heterogeneous among the places chosen in the Barra Bonita reservoir, mainly in the summer of the 2nd season. The 20% dilution of nutritious solution allowed better conditions for plant development and was considered significant to be used as base solution destined to the application of different levels 4 of N, P and K. Seasonal variation influenced the populations distribution, which heterogeneously occurred in the rainy season, in relation to population density. The Tietê River was considered the most eutrophic environment than the Piracicaba river, in relation to both soil and water column. B. subquadripara growth presented better adjustment to exponential and linear models, with determination coefficients above 90% and probability of 0,001 to 0,05. The absence of nitrogen affected the foliaceous area... (Complete abstract click electronic access below)
Doutor
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Keller, Julien. "Equations de type Vortex et métriques canoniques." Phd thesis, Université Paul Sabatier - Toulouse III, 2005. http://tel.archives-ouvertes.fr/tel-00012107.
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Soit $M$ une variété projective lisse. Soit $\mathscr{F}$ une filtration holomorphe sur $M$, c'est à dire une filtration d'un fibré vectoriel holomorphe $\mathcal{F}$ induite par des sous-fibrés. Nous introduisons une notion de Gieseker stabilité pour de tels objets puis donnons une condition analytique équivalente en terme de métriques sur $\mathcal{F}$, dites équilibrées au sens de S.K. Donaldson, provenant d'une construction de la Théorie des Invariants Géométriques. Si le fibré $\mathcal{F}$ peut être muni d'une métrique $h$ solution de l'équation $\boldsymbol{\tau}$-Hermite-Einstein étudiée par \'lvarez-C\'{o}nsul et Garc\'a-Prada:$$\sqrt\Lambda F_h = \sum_i \widetilde_i\pi^_$$
alors nous prouvons que la suite de métriques équilibrées existe, converge et sa limite est, à un changement conforme, solution de l'équation précédente. De ce résultat nous déduisons, par réduction dimensionnelle, un théorème d'approximation dans le cas des équations Vortex de Bradlow ainsi que leurs généralisations aux équations couplées Vortex.
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Yih, Vivien. "Can the Baddeley and Hitch model of working memory account for learning to spell using multisensory spelling strategies." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510686.
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This study had two aims. The first was to examine the relationship between working memory and spelling. The second was to explore how multisensory spelling strategies might support learning to spell within the framework of the working memory model of Baddeley and colleagues (Baddeley, 1986,2000; Baddeley and Hitch, 1974). The sample comprised 124 children (mean age 9 years 4 months). In study 1, children's verbal short-term memory, visuospatial memory, verbal working memory, and spelling were assessed. Regression analyses showed that only verbal short-term memory was a significant predictor of children's spelling scores. In study 2, the children learned to spell words using three different study strategies: their normal spelling strategy; a Look Say, Cover, Write Check strategy; and a simultaneous oral spelling strategy. Results showed that the children spelled significantly more words at post-intervention compared with pre-intervention but that no one spelling strategy was significantly more effective than another. Regression analyses exploring relationships between children's working memory scores and new words learned suggested that different multisensory strategies may draw upon different working memory components. Implications for practice are considered as well as suggestions for further research
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Rodrigues, Andréia Cristina Peres 1978. "Efeito de pontas e volumes de aplicação sobre os depósitos da pulverização em plantas de feijoeiro, Bidens pilosa L. e Brachiaria plantaginea (Link) Hitchc /." Botucatu : [s.n.], 2006. http://hdl.handle.net/11449/86469.
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Resumo: O presente trabalho teve como objetivo avaliar a quantidade e qualidade da deposição da calda de pulverização em plantas de feijão, Bidens pilosa L. e de Brachiaria plantaginea (Link) Hitch, presentes na linha e entrelinha da cultura, além da deposição no solo, em aplicações de pós-emergência. Foi utilizado como traçador o corante Azul Brilhante FDC -1 na concentração de 500 ppm. Os tratamentos constituíram de 3 modelos de ponta de pulverização, jato plano (XR 110015 VS e XR 11002 VS), jato plano duplo (TJ60 11002 VS) e jato cônico (TXVS 6 e TXVS 8); e dois volumes de aplicação 150 e 200 L ha-1, respectivamente. Utilizou-se o delineamento em blocos ao acaso, com 4 repetições. Os resultados dos dados quantitativos de deposição foram analisados nos seguintes esquemas em fatorial: para os depósitos em plantas de feijão foi utilizado o esquema 3 x 2 (3 modelos de pontas de pulverização x 2 volumes de aplicação); para as plantas daninhas presentes na linha e na entrelinha da cultura do feijão, o esquema foi 3 x 2 x 2 (3 modelos de pontas de pulverização x 2 volumes de aplicação x 2 espécies de plantas daninhas); para as estimativas de deposição no solo, o esquema foi 3 x 2 x 2 (3 modelos de pontas de pulverização x 2 posições (linha e entrelinha) x 2 volumes de aplicação). Foram amostradas 25 plantas por repetição em cada parcela, tanto para as plantas de feijão quanto para as plantas daninhas presentes na linha e na entrelinha da cultura. Após a aplicação, as plantas foram imediatamente coletadas, e em seguida foram lavadas em 100 mL de água destilada para posterior quantificação do traçador em espectrofotômetro. Para as analises qualitativa, cada planta selecionada ao acaso dentro da faixa de aplicação da barra foi considerada uma repetição, o que representou um total de 100 repetições. Os dados obtidos foram... (Resumo completo, clicar acesso eletrônico abaixo)Abstract: The present work had as objective to evaluate the amount and deposition quality of spray solution in common bean plants, Bidens pilosa L. and Brachiaria plantaginea (Link) Hitch, current in the crop row and spacing row, beyond the deposition in soil, in applications of post-emergency. It was used the brilliant blue FDC - 1 as tracer solution, with 500 ppm. The treatments had constituted of 3 models of spray nozzles, flat fan nozzle (XR 110015 VS and XR 11002 VS), double flat fan nozzle (TJ60 11002 VS) and cone nozzle (TXVS 6 and TXVS 8); and two application volumes 150 and 200 L ha-1, respectively. It was used a randomized blocks design, with four replications. Being that, the results of the quantitative data of deposition had been analyzed in following factorial schemes: for the deposits in common bean plants was used 3 x 2 factorial scheme (3 models of spray nozzle x 2 application volumes); for the weeds in the common bean crop row and spacing row, the factorial scheme was 3 x 2 x 2 (3 models of spray nozzle x 2 application volumes x 2 weed species); for the soil deposition estimates, the factorial scheme was 3 x 2 x 2 (3 models of spray nozzle x 2 positions (row and spacing row) x 2 application volumes). Were sampled 25 plants for replication in each plot, as much for the common bean plants as current weeds in crop row and spacing row. After application, the plants were immediately collected, and after they had been washed in 100 mL of distilled water for posterior tracer quantification in spectrophotometer. For the quantitative analysis, each random selected plant inside of boom application stripe bar was considered a replication, representing a total of 100 replications. The obtained data had been adjusted a regression curve for Gompertz model. The results had evidenced that: (i) the biggest deposits of spray solution in soil had occurred in the crop spacing row, independent of the... (Complete abstract click electronic access below)
Orientador: Dagoberto Martins
Coorientador: Fernando Tadeu de Carvalho
Banca: Carlos Gilberto Raetano
Banca: Mario Sergio Tomazela
Mestre
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Rodrigues, Andréia Cristina Peres [UNESP]. "Efeito de pontas e volumes de aplicação sobre os depósitos da pulverização em plantas de feijoeiro, Bidens pilosa L. e Brachiaria plantaginea (Link) Hitchc." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/86469.
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rodrigues_acp_me_botfca.pdf: 540833 bytes, checksum: 242455721b1b2564e11f5e3a054529f2 (MD5)O presente trabalho teve como objetivo avaliar a quantidade e qualidade da deposição da calda de pulverização em plantas de feijão, Bidens pilosa L. e de Brachiaria plantaginea (Link) Hitch, presentes na linha e entrelinha da cultura, além da deposição no solo, em aplicações de pós-emergência. Foi utilizado como traçador o corante Azul Brilhante FDC -1 na concentração de 500 ppm. Os tratamentos constituíram de 3 modelos de ponta de pulverização, jato plano (XR 110015 VS e XR 11002 VS), jato plano duplo (TJ60 11002 VS) e jato cônico (TXVS 6 e TXVS 8); e dois volumes de aplicação 150 e 200 L ha-1, respectivamente. Utilizou-se o delineamento em blocos ao acaso, com 4 repetições. Os resultados dos dados quantitativos de deposição foram analisados nos seguintes esquemas em fatorial: para os depósitos em plantas de feijão foi utilizado o esquema 3 x 2 (3 modelos de pontas de pulverização x 2 volumes de aplicação); para as plantas daninhas presentes na linha e na entrelinha da cultura do feijão, o esquema foi 3 x 2 x 2 (3 modelos de pontas de pulverização x 2 volumes de aplicação x 2 espécies de plantas daninhas); para as estimativas de deposição no solo, o esquema foi 3 x 2 x 2 (3 modelos de pontas de pulverização x 2 posições (linha e entrelinha) x 2 volumes de aplicação). Foram amostradas 25 plantas por repetição em cada parcela, tanto para as plantas de feijão quanto para as plantas daninhas presentes na linha e na entrelinha da cultura. Após a aplicação, as plantas foram imediatamente coletadas, e em seguida foram lavadas em 100 mL de água destilada para posterior quantificação do traçador em espectrofotômetro. Para as analises qualitativa, cada planta selecionada ao acaso dentro da faixa de aplicação da barra foi considerada uma repetição, o que representou um total de 100 repetições. Os dados obtidos foram...
The present work had as objective to evaluate the amount and deposition quality of spray solution in common bean plants, Bidens pilosa L. and Brachiaria plantaginea (Link) Hitch, current in the crop row and spacing row, beyond the deposition in soil, in applications of post-emergency. It was used the brilliant blue FDC - 1 as tracer solution, with 500 ppm. The treatments had constituted of 3 models of spray nozzles, flat fan nozzle (XR 110015 VS and XR 11002 VS), double flat fan nozzle (TJ60 11002 VS) and cone nozzle (TXVS 6 and TXVS 8); and two application volumes 150 and 200 L ha-1, respectively. It was used a randomized blocks design, with four replications. Being that, the results of the quantitative data of deposition had been analyzed in following factorial schemes: for the deposits in common bean plants was used 3 x 2 factorial scheme (3 models of spray nozzle x 2 application volumes); for the weeds in the common bean crop row and spacing row, the factorial scheme was 3 x 2 x 2 (3 models of spray nozzle x 2 application volumes x 2 weed species); for the soil deposition estimates, the factorial scheme was 3 x 2 x 2 (3 models of spray nozzle x 2 positions (row and spacing row) x 2 application volumes). Were sampled 25 plants for replication in each plot, as much for the common bean plants as current weeds in crop row and spacing row. After application, the plants were immediately collected, and after they had been washed in 100 mL of distilled water for posterior tracer quantification in spectrophotometer. For the quantitative analysis, each random selected plant inside of boom application stripe bar was considered a replication, representing a total of 100 replications. The obtained data had been adjusted a regression curve for Gompertz model. The results had evidenced that: (i) the biggest deposits of spray solution in soil had occurred in the crop spacing row, independent of the... (Complete abstract click electronic access below)
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Amorim, Sara Regina de [UNESP]. "Efeito da biomassa de espécie exótica (Brachiaria subquadripara (Trin.) Hitchc.) e nativa (Eichhornia azurea (SW. Kunth) sobre a estrutura da comunidade de macrófitas aquáticas." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/87832.
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amorim_sr_me_rcla.pdf: 536169 bytes, checksum: fff47fb3468cdfb820a4f0aaf0c557fe (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O estabelecimento, naturalização e expansão de espécies exóticas têm sido responsáveis por grandes mudanças na composição e estrutura dos ecossistemas naturais. Neste trabalho, testamos a hipótese de que a predominância e a biomassa de uma espécie exótica invasora alteram a estrutura da comunidade de macrófitas aquáticas de forma mais drástica que a predominância e biomassa de uma espécie nativa, reduzindo a riqueza funcional (RF), a riqueza de espécies (RE) e o índice de diversidade de Shannon (H’). O estudo foi realizado em rios da bacia hidrográfica do rio Itanhaém, litoral sul do Estado de São Paulo. A presença e a biomassa de macrófitas aquáticas foram obtidas por meio de quadrados coletados em bancos de macrófitas aquáticas com predominância de B. subquadripara, E. azurea ou ausência de predominância por essas espécies. Nossos resultados demonstram que áreas com predominância de B. subquadripara possuem número de espécies e grupos funcionais menores que os números encontrados nas áreas com predominância de E. azurea, ou sem predominância dessas espécies, e a predominância de E. azurea não interfere substancialmente na composição da comunidade de macrófitas aquáticas. O aumento de biomassa de B. subquadripara possui efeito negativo sobre a riqueza de espécies, riqueza funcional, índice de diversidade de Shannon e número de espécies emergentes, flutuantes livres, submersas enraizadas e epífitas, enquanto o aumento da biomassa E. azurea possui efeito positivo sobre o número de grupos funcionais na comunidade de macrófitas aquáticas e também sobre o número de espécies epífitas e submersas. Nossos resultados sugerem que o aumento da biomassa de B. subquadripara, espécie exótica invasora, assim como sua predominância, alteram a estrutura da comunidade de macrófitas aquáticas de forma mais drástica que o aumento da biomassa e predominância de E. azurea, espécie nativa, reduzindo
The establishment, naturalization and spread of exotic species have been responsible for major changes in the composition and structure of natural ecosystems. In this study, we tested the hypothesis that the prevalence and biomass of an invasive exotic species alter the structure of aquatic macrophyte communities in a more drastic than the dominance and biomass of native species, reducing the functional richness (FR), the wealth of species (RE) and Shannon diversity index (H '). The study was conducted in the river basin of the river Itanhaém, southern coast of São Paulo. The presence and biomass of aquatic macrophytes were obtained by means of squares collected in aquatic macrophytes with predominance of B. subquadripara, E. azurea or absence of both species. Our results show that areas with predominance of B. subquadripara number of species had a lower functional groups and than the numbers found in areas with a predominance of E. azurea, or without predominance of these species, and the prevalence of E. azurea does not interfere substantially in the community composition of aquatic macrophytes. The increase of biomass B. subquadripara had a negative effect on species richness, functional richness, Shannon diversity index and number of species emerging, free-floating, submerged rooted and epiphytes, while the increase in biomass E. azurea had positive effect on the number of functional groups in the community of aquatic macrophytes and also on the number of epiphytic species and submerged. Our results suggest that the increased biomass B. subquadripara, invasive alien species, as well as its predominance, alter the structure of aquatic macrophyte communities in a more drastic increase than the biomass and prevalence of E. azurea, native species, reducing the number of species and biological types of macrophytes in the littoral zones of rivers
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Amorim, Sara Regina de. "Efeito da biomassa de espécie exótica (Brachiaria subquadripara (Trin.) Hitchc.) e nativa (Eichhornia azurea (SW. Kunth) sobre a estrutura da comunidade de macrófitas aquáticas /." Rio Claro : [s.n.], 2012. http://hdl.handle.net/11449/87832.
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Orientador: Antonio Fernando Monteiro CamargoBanca: Sidnei Magela Thomaz
Banca: Marina Satika Suzuki
Resumo: O estabelecimento, naturalização e expansão de espécies exóticas têm sido responsáveis por grandes mudanças na composição e estrutura dos ecossistemas naturais. Neste trabalho, testamos a hipótese de que a predominância e a biomassa de uma espécie exótica invasora alteram a estrutura da comunidade de macrófitas aquáticas de forma mais drástica que a predominância e biomassa de uma espécie nativa, reduzindo a riqueza funcional (RF), a riqueza de espécies (RE) e o índice de diversidade de Shannon (H'). O estudo foi realizado em rios da bacia hidrográfica do rio Itanhaém, litoral sul do Estado de São Paulo. A presença e a biomassa de macrófitas aquáticas foram obtidas por meio de quadrados coletados em bancos de macrófitas aquáticas com predominância de B. subquadripara, E. azurea ou ausência de predominância por essas espécies. Nossos resultados demonstram que áreas com predominância de B. subquadripara possuem número de espécies e grupos funcionais menores que os números encontrados nas áreas com predominância de E. azurea, ou sem predominância dessas espécies, e a predominância de E. azurea não interfere substancialmente na composição da comunidade de macrófitas aquáticas. O aumento de biomassa de B. subquadripara possui efeito negativo sobre a riqueza de espécies, riqueza funcional, índice de diversidade de Shannon e número de espécies emergentes, flutuantes livres, submersas enraizadas e epífitas, enquanto o aumento da biomassa E. azurea possui efeito positivo sobre o número de grupos funcionais na comunidade de macrófitas aquáticas e também sobre o número de espécies epífitas e submersas. Nossos resultados sugerem que o aumento da biomassa de B. subquadripara, espécie exótica invasora, assim como sua predominância, alteram a estrutura da comunidade de macrófitas aquáticas de forma mais drástica que o aumento da biomassa e predominância de E. azurea, espécie nativa, reduzindo
Abstract: The establishment, naturalization and spread of exotic species have been responsible for major changes in the composition and structure of natural ecosystems. In this study, we tested the hypothesis that the prevalence and biomass of an invasive exotic species alter the structure of aquatic macrophyte communities in a more drastic than the dominance and biomass of native species, reducing the functional richness (FR), the wealth of species (RE) and Shannon diversity index (H '). The study was conducted in the river basin of the river Itanhaém, southern coast of São Paulo. The presence and biomass of aquatic macrophytes were obtained by means of squares collected in aquatic macrophytes with predominance of B. subquadripara, E. azurea or absence of both species. Our results show that areas with predominance of B. subquadripara number of species had a lower functional groups and than the numbers found in areas with a predominance of E. azurea, or without predominance of these species, and the prevalence of E. azurea does not interfere substantially in the community composition of aquatic macrophytes. The increase of biomass B. subquadripara had a negative effect on species richness, functional richness, Shannon diversity index and number of species emerging, free-floating, submerged rooted and epiphytes, while the increase in biomass E. azurea had positive effect on the number of functional groups in the community of aquatic macrophytes and also on the number of epiphytic species and submerged. Our results suggest that the increased biomass B. subquadripara, invasive alien species, as well as its predominance, alter the structure of aquatic macrophyte communities in a more drastic increase than the biomass and prevalence of E. azurea, native species, reducing the number of species and biological types of macrophytes in the littoral zones of rivers
Mestre
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Herfray, Yannick. "New Avenues for Einstein's Gravity : from Penrose's Twistors to Hitchin's Three-Forms." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEN060/document.
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Dans cette thèse nous explorons les aspects de la gravité d'Einstein qui sont propres à la dimension quatre.L'une des propriétés surprenantes liées à cette dimension est la possibilité de formuler la gravité de manière 'Chirale'. Dans ce type de reformulations, typiquement, la métrique perd son rôle centrale. La correspondance entre espace-temps et espace des twisteurs est un autre aspect propre à la dimension quatre. Ces formulations, Chirale et Twistorielle, semblent très différentes. Dans la première partie de cette thèse nous montrons qu'elles sont en fait intimement liées: en particulier nous proposons une nouvelle preuve du `théorème du graviton non-linéaire', due à Penrose, dont le cœur est la géométrie des SU(2)-connections (plutôt qu'une métrique). Dans la seconde partie de cette thèse nous montrons que la gravité en trois et quatre dimensions est liée à des théories d'une nature complètement différentes en dimension six et sept. Ces théories, due à Hitchin, sont des théories de trois-formes différentielles invariantes sous difféomorphismes. En dimensions sept, nous rencontrons seulement un succès partiel puisque la théorie 4D qui en résulte est une version modifiée de la gravité. Cependant nous prouvons au passage que les solutions d'une déformation particulière de la gravité ont, en 7D, l’interprétation de variétés avec holonomies G2.Par contre, en réduisant la théorie de six à trois dimensions nous obtenons précisément la gravité 3D. Nous présentons aussi de nouvelles fonctionnelles pour les formes différentielles en six dimensions. Toutes sont invariantes sous difféomorphismes et deux d’entre elles sont topologiquesIn this thesis we take Einstein theory in dimension four seriously, and explore the special aspects of gravity in this number of dimension.Among the many surprising features in dimension four, one of them is the possibility of `Chiral formulations of gravity' - they are surprising as they typically do not rely on a metric. Another is the existence of the Twistor correspondence. The Chiral and Twistor formulations might seems different in nature. In the first part of this thesis we demonstrate that they are in fact closely related. In particular we give a new proof for Penrose's `non-linear graviton theorem' that relies on the geometry of SU(2)-connections only (rather than on metric).In the second part of this thesis we describe partial results towards encoding the full GR in the total space of some fibre bundle over space-time. We indeed show that gravity theory in three and four dimensions can be related to theories of a completely different nature in six and seven dimension respectively. This theories, first advertised by Hitchin, are diffeomorphism invariant theories of differential three-forms.Starting with seven dimensions, we are only partially succesfull: the resulting theory is some deformed version of gravity. We however found that solutions to a particular gravity theory in four dimension have a seven dimensional interpretation as G2 holonomy manifold. On the other hand by going from six to three dimension we do recover three dimensional gravity. As a bonus, we describe new diffeomorphism invariant functionnals for differential forms in six dimension and prove that two of them are topological
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Salvador, Paulo Roberto. "ADUBAÇÃO NITROGENADA EM PASTAGEM DE PAPUÃ." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/10862.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorThe experiment was carried out to evaluate the herbage production, sward structure, stocking rate, weight gain per area and nutritive value of forage as grazed in alexandergrass (Urochloa plantaginea (Link) Hitch) pasture fertilized with nitrogen (N). The experimental design was completely randomized following a repeated measurements arrangement. The treatments were 0; 100; 200 or 300 kg/ha of N. The experimental animals were Angus heifers with initial age and body weight of 15 month and 241.5±5 kg, respectively. The grazing method was continuous stocking with variable number of animals. The N utilization regardless of the amount increases 25% the daily herbage accumulate rate. The N fertilization increases 23% the weight gain per area. The quantity of 97.2 kg/ha of N allows greater leaf mass and increases in 20% the leaf:steam ratio. The alterations in sward structure changes the nutritive value of forage as grazed. The utilization of 112.7 kg/ha of N allows higher stocking rate (2049.8 kg/ha of BW) equivalent to 7.5 heifers per hectare.
Objetivou-se estudar a produção de forragem, estrutura do dossel, taxa de lotação, ganho de peso por área e o valor nutritivo da forragem aparentemente consumida por bezerras de corte em pastagem de papuã (Urochloa plantaginea (Link) Hitch) adubada com nitrogênio (N). O delineamento experimental foi inteiramente casualizado, com medidas repetidas no tempo. Os tratamentos foram 0; 100; 200 ou 300 kg/ha de N. Os animais experimentais foram bezerras da raça Angus com idade e peso iniciais de 15 meses e 241±5 kg, respectivamente. O método de pastejo foi contínuo, com número variável de animais. A utilização de N, independente da quantidade, aumentou em 25% a taxa de acúmulo de forragem. A adubação com N proporciona aumento de 23% no ganho de peso por área. A dose de 97,2 kg/ha de N proporciona maior massa de lâminas foliares e aumento de 20% na razão folha:colmo. As alterações na estrutura do dossel modificam o valor nutritivo da forragem aparentemente colhida pelas bezerras. A dose de 112,7 kg/ha de N permite a manutenção da maior taxa de lotação (2049,8 kg/ha de PC), equivalendo a 7,5 bezerras por hectare.
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Zelaci, Hacen. "Espaces de modules de fibrés vectoriels anti-invariants sur les courbes et blocs conformes." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4063/document.
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Soit X une courbe projective lisse et irréductible munie d'une involution σ. Dans cette thèse, nous étudions les fibrés vectoriels invariants and anti-invariants sur X sous l'action induite par σ. On introduit la notion de modules σ-quadratiques et on l'utilise, avec GIT, pour construire ces espaces de modules, puis on en étudie certaines propriétés. Ces espaces de modules correspondent aux espaces de modules de G-torseurs parahoriques sur la courbe X/σ , pour certains schémas en groupes parahoriques G de type Bruhat-Tits, qui sont twistés dans le cas des anti-invariants. Nous développons les systèmes de Hitchin sur ces espaces de modules et on les utilise pour dériver une classification de leurs composantes connexes en les dominant par des variétés de Prym. On étudie aussi le fibré déterminant sur les espaces de modules des fibrés vectoriels anti-invariants. Dans certains cas, ce fibré en droites admet certaines racines carrées appelées fibrés Pfaffiens. On montre que les espaces des sections globales des puissances de ces fibrés en droites (les espaces des fonctions thêta généralisées) peuvent être canoniquement identifier avec les blocs conformes associés aux algèbres de Kac-Moody affines twistées de type A(2)Let X be a smooth irreducible projective curve with an involution σ. In this dissertation, we studythe moduli spaces of invariant and anti-invariant vector bundles over X under the induced action of σ. We introduce the notion of σ-quadratic modules and use it, with GIT, to construct these moduli spaces, and than we study some of their main properties. It turn out that these moduli spaces correspond to moduli spaces of parahoric G-torsors on the quotient curve X/σ, for some parahoric Bruhat-Tits group schemes G, which are twisted in the anti-invariant case.We study the Hitchin system over these moduli spaces and use it to derive a classification of theirconnected components using dominant maps from Prym varieties. We also study the determinant of cohomology line bundle on the moduli spaces of anti-invariant vector bundles. In some cases this line bundle admits some square roots called Pfaffian of cohomology line bundles. We prove that the spaces of global sections of the powers of these line bundles (spaces of generalized theta functions) can be canonically identified with the conformal blocks for some twisted affine Kac-Moody Lie algebras of type A(2)
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Kalsing, Augusto. "Desenvolvimento, automatização e validação de modelo bioeconômico de gestão de Brachiria plantaginea (Link) Hitch. na cultura do feijão comum (Phaseolus vulgaris L.)." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/60979.
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A espécie Brachiaria plantaginea (papuã) reduz a rentabilidade da cultura do feijão comum. O manejo apropriado dessa planta daninha requer a seleção de medidas de controle que oportunizem otimizar o retorno econômico da cultura com o seu uso. Um modelo de gestão baseado em critérios de ordem agronômica e econômica poderá vir a ser uma ferramenta promissora para auxiliar nesta seleção. Para isso, foram conduzidos no LAFLOR, em Porto Alegre - RS e, na EEA, em Eldorado do Sul - RS, nos anos de 2008, 2009 e 2010, seis linhas de estudo tendo por objetivos: avaliar a seletividade diferencial de herbicidas aplicados em pré-emergência entre o papuã e o feijoeiro comum; estabelecer relações entre o nível de infestação dessa planta daninha e o desempenho agronômico da cultura, para duas cultivares de feijão comum; e, determinar o valor da dose ótima agronômica e econômica de herbicidas graminicidas para controlar papuã em pós-emergência da cultura. Os herbicidas dimethenamid, S-metolachlor, pendimethalin e trifluralin foram seletivos à cultura e, além disso, reduziram o nível de infestação de papuã na lavoura. O papuã afetou negativamente o rendimento de grãos de feijão comum e seus componentes, reduzindo acentuadamente o retorno econômico da cultura. O valor do NCD do papuã variou de acordo com as cultivares de feijão comum, épocas de avaliação, variáveis explicativas da infestação e modelos matemáticos. A dose ótima de clethodim, sethoxydim e fluazifop-p-butil, tanto agronômica quanto econômica, foi inferior ao valor da dose máxima de registro para controlar papuã. Com essas informações, desenvolveu-se, automatizou-se e validou-se um modelo para mediar a escolha das opções de controle do papuã.Brachiaria plantaginea reduces grain profitability of common bean. Appropriate management of this weed requires the selection of measures that can optimize the crop economic return. A bioeconomical model based on agronomic and economic criteria could be a promising tool to assist with this selection of weed control options. Experiments were carried out at LAFLOR, Porto Alegre - RS, and at EEA, Eldorado do Sul - RS, during 2008, 2009 and 2010, with the objectives: to assess the selectivity of pre-emergence herbicides in common bean plants; to study the relationships between B. plantaginea infestation and crop agronomic performance, for different common bean cultivars, and to determine the value of the optimal agronomic dose and optimal economic dose for control this weed at post-emergence of common bean. The herbicides dimethenamid, S-metolachlor, pendimethalin and trifluralin did not cause crop injury and also provided different weed densities. The magnitude of common bean yield was proportional to B. plantaginea density. The main components of the crop grain yield were also affected by the weed density. The impact of each B. plantaginea plant on the crop yield depended on the bean cultivars, assessment period, variables evaluated, and mathematical models. The optimal agronomic and economic herbicide dose was below the recommended dose of the herbicides to control B. plantaginea in common bean. Based on these data, a bioeconomical model was developed, automated, and validated to help to decide the best options for B. plantaginea control.
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Bouthier, Alexis. "Géométrisation du côté orbital de la formule des traces." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112064.
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Ce travail de thèse a pour but de construire et d’étudier une fibration de Hitchin pour les groupes qui apparaît naturellement lorsque l’on essaie de géométriser la formule des traces. On commence par construire une telle fibration en utilisant le semi-groupe de Vinberg. Sur ce semi-groupe de Vinberg, on montre qu’il existe un certain morphisme « polynôme caractéristique » muni d’une section naturelle, de même que dans le cas des algèbres de Lie. On montre également que l’on peut construire un centralisateur régulier au-dessus de cette base des polynômes caractéristiques qui est un schéma en groupes commutatif et lisse.On s’intéresse alors à des variantes pour les groupes des fibres de Springer affines pour lesquelles on remarque que l’introduction du semi-groupe de Vinberg permet d’obtenir une condition d’intégralité analogue à celle de Kazhdan-Lusztig. Ces fibres de Springer affines sont des analogues locaux des fibres de Hitchin. On obtient alors une formule de dimension pour ces fibres.Dans un troisième temps, on s’intéresse à l’aspect global de cette fibration pour laquelle on donne une interprétation modulaire et sur laquelle on construit l’action d’un champ de Picard, issu du centralisateur régulier. L’espace total de cette fibration étant en général singulier, nous étudions son complexe d’intersection. Cet espace de Hitchin s’obtient naturellement comme l’intersection du champ de Hecke avec la diagonale du champ des G-torseurs et on démontre que sur un ouvert suffisamment gros de la base de Hitchin, le complexe d’intersection de l’espace de Hitchin s’obtient par restriction de celui du champ de Hecke corrrespondant.Enfin, dans la dernière partie de cette thèse, on établit un théorème du support dans le cas où l’espace total est singulier analogue à celui de Ngô et l’on démontre que, dans le cas de la fibration de Hitchin, les supports qui interviennent sont reliés aux strates endoscopiquesThis main goal of this work is to construct and study the properties of Hitchin fibration for groups which appears naturally when we try to geometrize the trace formula. We begin by constructing this fibration using the Vinberg’s semigroup. On this semigroup, we show that there exists a characteristic polynomial morphism equipped with a natural section, analog at the Kostant’s one in the case of Lie algebras. We also show that there exists on the base of characteristic polynomials a regular centralizer scheme, which is a smooth commutative group scheme.Then, we are interested in some variant of affine Springer fibers, for which we see that the Vinberg’s semigroup appears naturally to obtain an integrality condition analog to Kazhdan-Lusztig’s one. These affine Springer fibers are local incarnation of Hitchin fibers.In a third time, we go back to the global case and give a modular interpretation of this new Hitchin fibration on which we construct an action of a Picard stack, coming from the regular centralizer.The total space of this fibration, even on the generically regular semisimple locus will be singular and we want to understand his intersection complex. This space can be obtained as the intersection of the Hecke stack with the diagonal of the stack of G-bundles and we show that on a sufficiently big open subset of the Hitchin base, the intersection complex of the Hitchin’s space is the restriction of the corresponding intersection complex on the Hecke stack.Finally, in the last part of this work, we establish a support theorem in the case of a singular total space, generalizing Ngo’s theorem et we show that in the case of Hitchin fibration, the supports that appear are related to the endoscopic strata
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Penekaitė, Laima. "Interneto meno kūrinys „Kelyje autostopu"." Bachelor's thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100902_225815-34958.
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Keliavimo ir judėjimo fenomenas yra svarbus kiekvienam žmogui. Net fiziškai nejudėdamas, jis keliauja mintimis, virtualiai. Žmogus gali pasirinkti kelionės ir keliautojo tipą - nuo paprasto atostogautojo vasaros metu, kelionių agentūros suorganizuotoje poilsinėje kelionėje iki bastūniškų kelionių nežinant galutinio tikslo. Kalbant apie keliavimą autostopu daugeliui kyla viena mintis - keliavimas nemokant už kelionę. Šiame bakalauro darbe analizuojamas ir atskleidžiamas keliautojas autostopu, kurio kelionės yra unikalios, išlaisvinančios ir nepasikartojančios.
Darbe atsleidžiami keliautojų tipai sociologiniu ir semantiniu požiūriu. Keliautojas/kelionė gretinama su kultūra/menu. Meno kūrinys dažnai pats tampa kelionės objektu ir keliauja sukurdamas tarpkultūrinį dialogą. Internetui „įsibrovus” į mūsų gyvenimus ir kasdienybę, keliautojas persikelia į virtualią erdvę tampdamas tinklo bastūnu, o tuo tarpu vis daugiau kūrėjų pradeda kurti Interneto meną (Net.art ). Dėl interaktyvumo keliautojas autostopu išlieka nenuspėjamas ir virtualioje aplinkoje.
Kūrybinio projekto pagrindinis personažas taip pat keliautojas autostopu. Jis perkeliamas į interaktyvią Korsakow programą ir gautas video projektas į internetą. Kūrinyje daug dienoraštiškumo. Jame gausu rašytinio, video, fotografijų dienoraščio formų. Interaktyviai valdant sukurtas nuorodas žiūrovas pats pradeda keliauti žiūrėdamas keliautojo trumpus nuotykių... [toliau žr. visą tekstą]The phenomenon of travel and movement is important to everyone. Even physically motionless, human can travel through ideas, virtually. Humans can choose the type of travel and travelers – from a simple summer holidays, travel agencies’ organized till a tripf the vagabond traveling without knowing the final goal. Speaking about travel by hitch-hiking for many there is one idea – traveling without paying for the trip. This bachelor thesis analyzes and reveals hitch- hiker whos’ travels are unique, liberating and recurrent. The paper reveals types of travelers in sociological and semantic point of view. Traveler/ travel is compared with culture/ arts. Work of art itself often becomes the object of the journey and travels creating intercultural dialogue. Because of internet “breaking” into our everyday lives, traveler moves into virtual space becoming net vagabond, while more and more creators begin to create Net.art. The hitch-hiker stays unpredictable in virtual environments through interactivity. The main character in creative project is the hitch-hiker. He is moved to the interactive Korsakow project program and video project on the Internet. The work has a lot of features of diary. It contains lot of written, video, photographs diary forms. The viewer managing an interactive links starts to travel watching a short moments of traveler adventures.
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Pontalti, Anderson. "Análise de fadiga e estimativa de vida do garfo de engate automático para veículos tratores e reboques." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2005. http://hdl.handle.net/10183/8338.
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A necessidade de se desenvolver um produto capaz de atingir as exigências impostas pela referência normativa AS-2213 (1984) e a falta de uma rotina de projeto para o componente denominado Garfo do Engate Automático motivam este trabalho. Assim, esta pesquisa apresenta como objetivo principal o estudo de fadiga e estimativa de vida do garfo forjado de um dispositivo de acoplamento automático entre veículos tratores e reboques. Para realização das análises estáticas através de elementos finitos, foi necessária a determinação de todas as condições de contorno que refletissem as características do teste experimental de homologação do produto. De posse destes resultados, realizou-se a análise pelo método S-N, tendo como resultado a determinação da vida em fadiga das regiões críticas do componente, onde são propostas algumas alternativas que visam aumentar a vida do produto. Dentre as inúmeras alternativas possíveis, destacam-se a alteração de material e utilização de tratamento térmico no garfo.The necessary development of a product capable of reaching the imposed requirements in accordance with reference standard AS-2213 (1984) and the lack of a project routine for the component called Towing Hitch Fork motivated this research. Thus, this research presents as its main goal, the study of fatigue and life predictions of forged fork of the automatic coupling device used in tractor vehicles and trailers. To perform the static analysis through finite elements method, it was necessary to determine all contour conditions which represent the features of product certification tests. After preliminary results have been obtained, the S-N analysis has been performed, showing the fatigue life predictions in the critical regions of the component, where some alternatives aiming at increasing the product life were considered. Among the several alternatives, it is possible to highlight the material changes and the use of thermal treatment in the component.
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Voburka, Tomáš. "Vliv parametrů tříbodového závěsu na tahové vlastnosti traktorů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417475.
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The diploma thesis is focused on the development of a mathematical model of the tractor-tool set in the MSC Adams program enabling analysis of the influence of the position of the upper linkage of the three-point hitch on the load of the driving wheels during the system operation. The measured force effects are analysed with focus on the adhesion load of the drive wheels and the traction properties of the tractor. Based on the calculations made, it determines the optimal setting of the upper link of the hitch for the connected tool.
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Thomas, Alexander. "Structures complexes supérieures et théorie de Teichmüller supérieure." Thesis, Strasbourg, 2020. http://www.theses.fr/2020STRAD006.
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Dans cette thèse, on donne une nouvelle approche géométrique aux composantes des variétés de caractères. En particulier on construit une structure géométrique sur des surfaces, généralisant la structure complexe, et on explore son lien avec les composantes de Hitchin. Cette structure, appelée structure complexe supérieure, est construite en utilisant le schéma de Hilbert ponctuel du plan. Son espace des modules admet des propriétés similaires à la composante de Hitchin. On construit une courbe spectrale généralisée, une sous-variété (presque) Lagrangienne de l’espace cotangent complexifié de la surface. Partant d’une structure complexe supérieure, on cherche à la déformer d’une façon canonique en une connexion plate. L’espace de ces connexions plates, dites “paraboliques”, s’obtient en imitant la réduction d’Atiyah–Bott. C’est un espace de paires d’opérateurs différentiels commettants. Sous une conjecture, on établit un difféomorphisme canonique entre l’espace des modules de notre structure géométrique et la composante de Hitchin. Enfin, on généralise certaines constructions, comme le schéma de Hilbert ponctuel et la structure complexe supérieure, au cas d’une algèbre de Lie simpleIn this PhD thesis, we give a new geometric approach to higher Teichmüller theory. In particular we construct a geometric structure on surfaces, generalizing the complex structure, and we explore its link to Hitchin components. The construction of this structure, called higher complex structure, uses the punctual Hilbert scheme of the plane. Its moduli space admits similar properties to Hitchin’s component. We construct a generalized spectral curve, an (almost) Lagrangian subvariety of the complexified cotangent space of the surface. Given a higher complex structure, we try to canonically deform it to a flat connection. The space of such connections, called “parabolic”, is obtained by imitating the Atiyah–Bott reduction. It is a space of pairs of commuting differential operators. Under some conjecture, we establish a canonical diffeomorphism between our moduli space and Hitchin’s component. Finally, we generalize certain constructions, like the punctual Hilbert scheme and the higher complex structure, to the case of a simple Lie algebra
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Ayto, Jennifer. "The contribution by women to the social and ecomomic development of the Victorian town in Hertfordshire." Thesis, University of Hertfordshire, 2013. http://hdl.handle.net/2299/10619.
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This study focuses on the role and contribution of women in the context of the social and economic development of two towns in Hertfordshire during the nineteenth century. Although the age saw an increase in urbanisation, Hertfordshire remained an agricultural county with long established land owners, a middle class with influence in the towns and its closeness to London attracting the newly wealthy in search of a country estate. The towns selected for this study, Hertford and Hitchin, changed little in their character and, compared with others which experienced industrial expansion, saw a modest population growth. This, however, brought the consequential pressures on housing and poverty. This research is unique in combining the study of the activities of women and the challenges faced by two market towns over a period of time of change and thus making a contribution to the debate on the concept of “separate spheres” by demonstrating that women had a place in the public arena. The daily life of a country town was reliant on a thriving economic environment. As this research demonstrates, many women had trades and businesses, contributed to good causes and were central to the education of children and adults. Their philanthropic efforts supported the building and maintenance of churches, schools, and hospitals. It charts the role of ordinary women, operating in a small town environment, before extension of the suffrage and Equal Opportunities legislation established their position as legitimate influencers of policy and practice. Little work has been done on how the English small town coped with its growth in population and the summons from central government on compliance with an increasing body of legislation on how the town should be run. It was men who undertook the necessary offices associated with this seed of local government but a micro-history of the people who inhabited these two towns demonstrates that women made a significant contribution to social and economic life of these towns.
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Negrini, Mateus. "RECRIA DE NOVILHAS RECEBENDO FARELO DE ARROZ EM PASTAGEM DE PAPUÃ." Universidade Federal de Santa Maria, 2016. http://repositorio.ufsm.br/handle/1/10920.
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Fundação de Amparo a Pesquisa no Estado do Rio Grande do SulThe work was developed with the objective to evaluate the intake of forage and beef heifers performance from 15 to 18 months old, grazing in Alexandergrass (Urochloa plantaginea (Link) Hitch) under rotational grazing method, receiving rice bran (FAI) as a supplement, at different levels (0, 0.5 and 1.0% of body weight (BW)). The experimental design was completely randomized with repeated measures over time. The use of FAI increased the total intake of dry matter (DM), total intake of crude protein and total digestible nutrients in relation to heifers exclusively on pasture. The heifers that received 1.0% PC FAI reduced the intake of forage DM increasing by 18% stocking rate (SR) and 27% BW gain per hectare (BWA) compared with the system exclusively in pasture. In the system in which the heifers received FAI at 0.5% of BW the SR and BWA were similar to other systems. In this feed system daily weight gain 18% higher than heifers exclusively on pasture and similar gain to the use of FAI at 1.0% of BW were observed. In Alexandergrass pasture under rotational grazing, using FAI at 0.5% of BW for beef heifers from 15 to 18 months of age is recommended to promote higher production response when compared to heifers exclusively on pasture and similar production when provided FAI at 1.0% of BW.
O trabalho foi desenvolvido com o objetivo de avaliar o consumo de forragem e o desempenho de novilhas de corte dos 15 aos 18 meses de idade, em pastejo em papuã (Urochloa plantaginea (Link) Hitch), sob método rotativo de pastejo, recebendo farelo de arroz integral (FAI) como suplemento, em diferentes níveis (0, 0,5 e 1,0% do peso corporal (PC)). O delineamento experimental foi o inteiramente casualizado, com medidas repetidas no tempo. O uso de FAI aumentou o consumo total de matéria seca (MS), consumo total de proteína bruta e de nutrientes digestíveis totais em relação às novilhas exclusivamente em pastejo. O consumo total de fibra em detergente neutro foi similar nos diferentes sistemas alimentares. As novilhas que receberam 1,0% do PC de FAI reduziram o consumo de MS da forragem, aumentando em 18% a taxa de lotação (TxLot) e em 27% o ganho de PC por hectare (GPA) em comparação com o sistema exclusivamente a pasto. No sistema em que as novilhas receberam 0,5% do PC de FAI a TxLot e o GPA foram similares aos demais sistemas. Nesse sistema alimentar foi observado GDM 18% superior em relação as novilhas exclusivamente em pastejo e ganho similar ao uso de 1,0% do PC de FAI. Em pastagem de papuã, sob pastejo rotacionado, é recomendado o uso de 0,5% do PC de FAI para novilhas de corte dos 15 aos 18 meses de idade, por promover respostas produtivas superiores em relação as novilhas exclusivamente em pastejo e semelhantes as observadas quando fornecido 1,0% do PC de FAI.
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Rendek, Marek. "Analýza silových účinků v tříbodovém závěsu na výstupní parametry traktoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378510.
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The diploma thesis deals with the issue of force effects in the three-point hitch links in the multi-body environment depending on the forces ejected to the plow during the plowing. Through simulations, force responses under the tractor wheels are also identified for various conditions. The work is also analyzed for the impact of the upper link attachment relative to the tractor output parameters.
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Mohamed, Amer. "Load Calculation and Simulation of an Asphalt Roller." Thesis, Blekinge Tekniska Högskola, Avdelningen för maskinteknik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4174.
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Free body diagrams of an Asphalt Roller were designed for several load cases and used for an optimisation study. Assumptions for the load calculations for each load case were carried out in MATLAB®. The Roller was built in I-DEAS® and the results were compared with the theoretical resultsF.B.D av en Asfalt Vältar designerades för olika last fall och användas för en optimisation studier. Antagandena för de olika last beräkningarna utfördas i MATLAB. Vältar byggdes i I-DEAS och resultaten jämfördes med de teoretiska.
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