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Mason, Jonathan W. "Uniform algebras over complete valued fields." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12419/.
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UNIFORM algebras have been extensively investigated because of their importance in the theory of uniform approximation and as examples of complex Banach algebras. An interesting question is whether analogous algebras exist when a complete valued field other than the complex numbers is used as the underlying field of the algebra. In the Archimedean setting, this generalisation is given by the theory of real function algebras introduced by S. H. Kulkarni and B. V. Limaye in the 1980s. This thesis establishes a broader theory accommodating any complete valued field as the underlying field by involving Galois automorphisms and using non-Archimedean analysis. The approach taken keeps close to the original definitions from the Archimedean setting. Basic function algebras are defined and generalise real function algebras to all complete valued fields. Several examples are provided. Each basic function algebra is shown to have a lattice of basic extensions related to the field structure. In the non-Archimedean setting it is shown that certain basic function algebras have residue algebras that are also basic function algebras. A representation theorem is established. Commutative unital Banach F-algebras with square preserving norm and finite basic dimension are shown to be isometrically F-isomorphic to some subalgebra of a Basic function algebra. The theory of non-commutative real function algebras was established by K. Jarosz in 2008. The possibility of their generalisation to the non-Archimedean setting is established in this thesis. In the context of complex uniform algebras, a new proof is given using transfinite induction of the Feinstein-Heath Swiss cheese “Classicalisation” theorem.
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Hossain, Akash. "Forking in valued fields and related structures." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASM019.
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Cette thèse est une contribution à la théorie des modèles des corps valués. On étudie la déviation dans les corps valués, ainsi que certains de leurs réduits. On s'intéresse particulièrement aux corps pseudo-locaux, les ultraproduits de caractéristique résiduelle nulle des corps valués p-adiques. Nous considérons d'abord aux groupes des valeurs des corps valués qui nous intéressent, les groupes Abéliens ordonnés réguliers. Nous y établissons description géométrique de la déviation, ainsi qu'une classification détaillée des extensions globales non-déviantes ou invariantes d'un type donné. Nous démontrons ensuite des principes d'Ax-Kochen-Ershov pour la division et la déviation dans la théorie resplendissante des expansions de suites exactes courtes pures de structures Abéliennes, telles qu'étudiées dans l'article sur la distalité d'Aschenbrenner-Chernikov-Gehret-Ziegler. En particulier, nos résultats s'appliquent aux groupes des termes dominants des (expansions de) corps valués. Pour finir, nous donnons diverses conditions suffisantes pour qu'un ensemble de paramètres soit une base d'extension dans un corps valué Hensélien de caractéristique résiduelle nulle. En particulier, nous démontrons que la déviation coïncide avec la division dans les corps pseudo-locaux de caractéristique résiduelle nulle. Nous discutons aussi des résultats de Ealy-Haskell-Simon sur la déviation pour les extensions séparées de corps valués Henséliens de caractéristique résiduelle nulle. Nous contribuons à la question en démontrant que, dans le cas d'une extension Abhyankar, et avec quelques hypothèses supplémentaires, la non-déviation d'un type dans in corps pseudo-local implique l'existence d'une mesure de Keisler globale invariante dont le support contient ce type, à l'instar des corps pseudo-finisThis thesis is a contribution to the model theory of valued fields. We study forking in valued fields and some of their reducts. We focus particularly on pseudo-local fields, the ultraproducts of residue characteristic zero of the p-adic valued fields. First, we look at the value groups of the valued fields we are interested in, the regular ordered Abelian groups. We establish for these ordered groups a geometric description of forking, as well as a full classification of the global extensions of a given type which are non-forking or invariant. Then, we prove an Ax-Kochen-Ershov principle for forking and dividing in expansions of pure short exact sequences of Abelian structures, as studied by Aschenbrenner-Chernikov-Gehret-Ziegler in their article about distality. This setting applies in particular to the leading-term structure of (expansions of) valued fields. Lastly, we give various sufficient conditions for a parameter set in a Henselian valued field of residue characteristic zero to be an extension base. In particular, we show that forking equals dividing in pseudo-local of residue characteristic zero. Additionally, we discuss results by Ealy-Haskell-Simon on forking in separated extensions of Henselian valued fields of residue characteristic zero. We contribute to the question in the setting of Abhyankar extensions, where we show that, with some additional conditions, if a type in a pseudo-local field does not fork, then there exists some global invariant Keisler measure whose support contains that type. This behavior is well-known in pseudo-finite fields
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Touchard, Pierre Verfasser], and Martin [Akademischer Betreuer] [Hils. "On transfer principles in Henselian valued fields / Pierre Touchard ; Betreuer: Martin Hils." Münster : Universitäts- und Landesbibliothek Münster, 2020. http://d-nb.info/122398379X/34.
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Touchard, Pierre [Verfasser], and Martin [Akademischer Betreuer] Hils. "On transfer principles in Henselian valued fields / Pierre Touchard ; Betreuer: Martin Hils." Münster : Universitäts- und Landesbibliothek Münster, 2020. http://d-nb.info/122398379X/34.
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Lehéricy, Gabriel. "Quasi-orders, C-groups, and the differentiel rank of a differential-valued field." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC130/document.
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Cette thèse a pour objet les ordres, les valuations et les C-relations sur les groupes, ainsi que les corps différentiels valués tels qu’étudiés par Rosenlicht. Elle accomplit trois objectifs principaux. Le premier est d’introduire et d’étudier une notion de quasi-ordre sur les groupes qui a pour but de réunir les ordres et les valuations dans un même cadre. Nous donnons un théorème de structure des groupes munis d’un tel quasi-ordre, ce qui nous permet ensuite de donner un “théorème de plongement de Hahn” pour ces groupes. Le second objectif de cette thèse est de décrire les C-groupes à l’aide des quasi-ordres. Nous donnons un théorème de structure pour les C-groupes, qui énonce que tout C-groupe est un “mélange” de groupes ordonnés et de groupes valués. Nous utilisons ensuite ce résultat pour caractériser les groupes C-minimaux à l’intérieur de la classe des C-groupes. Le troisième objectif de cette thèse est d’introduire et d’étudier une notion de rang différentiel d’un corps différentiel valué. Nous définissons cette notion par analogie avec les notions de rang exponentiel d’un corps exponentiel et de rang de différence d’un corps aux différences. Nous montrons que cette notion de rang n’est pas tout à fait satisfaisante, et introduisons donc une meilleure notion de rang appelée le rang différentiel déployé. Nous donnons ensuite une méthode pour définir une dérivation “de type Hardy” sur un corps de séries formelles généralisées, ce qui nous permet de construire des corps différentiels valués dont le rang différentiel et le rang différentiel déployé ont été arbitrairement choisisThis thesis deals with orders, valuations and C-relations on groups, and with differential-valued fields à la Rosenlicht. It achieves three main objectives. The first one is to introduce and study a notion of quasi-order on groups meant to encompass orders and valuations in a common framework. We give a structure theorem for groups endowed with such a quasi-order, which then allows us to give a “Hahn’s embedding theorem” for these groups. The second objective of this thesis is to describe C-groups via quasi-orders. We give a structure theorem for C-groups, which basically states that any C-group is a “mix” of ordered groups and valued groups. We then use this result to characterize C-minimal groups inside the class of C-groups. The third objective of this thesis is to introduce and study a notion of differential rank for differential-valued fields. We define this notion by analogy with the exponential rank of an exponential field and with the difference rank of a difference field. We show that this notion of rank is not quite satisfactory, so we introduce a better notion of rank called the unfolded differential rank. We then give a method to define “Hardy-type” derivations on fields of generalized power series, which allows us to build differential-valued fields of arbitrary given differential rank and unfolded differential rank
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Rideau, Silvain. "Éliminations dans les corps valués." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112375/document.
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Cette thèse est une contribution à la théorie des modèles des corps valués. Les principaux résultats de ce texte sont des résultats d’éliminations des quantificateurs et des imaginaires. Le premier chapitre contient une étude des imaginaires dans les extensions finies de Qp. On y démontre que ces corps ainsi que leurs ultraproduits éliminent les imaginaires dans le langage géométrique. On en déduit un résultat de rationalité uniforme pour les fonctions zêta associées aux familles de relations d’équivalences définissables dans les extensions finies de Qp. La motivation première du deuxième chapitre est l’étude de W(F_p^alg) en tant que corps valué analytique de différence. Plus généralement, on démontre un théorème d’élimination des quantificateurs de corps dans le langage RV pour les corps valués analytiques -Henséliens de caractéristique nulle. On donne aussi une axiomatisation de la théorie de W(F_p^alg) ainsi qu’une preuve qu’elle est NIP. Dans le troisième chapitre, on prouve la densité des types définissables dans certains enrichissements d’ACVF. On en déduit un critère pour l’élimination des imaginaires et la propriété d’extension invariante. Ce chapitre contient aussi des résultats abstraits sur les ensembles extérieurement définissables dans les théories NIP. Dans le dernier chapitre, les résultats du chapitre précédent sont appliqués à VDF, la modèle complétion des corps valués munis d’une dérivation qui préserve la valuation, pour obtenir l’élimination des imaginaires dans le langage géométrique ainsi que la densité des types définissables et la propriété d’extension invariante. Ce chapitre contient aussi des considérations sur les fonctions définissables, les types et les groupes définissables dans VDFThis thesis is about the model theory of valued fields. The main results in this text are eliminationsof quantifiers and imaginaries. The first chapter is concerned with imaginaries in finite extensions of Qp. I show that these fields and their ultraproducts eliminate imaginaries in the geometric language. As a corollary, I obtain the uniform rationality of zeta functions associated to families of equivalence relations that aredefinable in finite extensions of Qp.The motivation for the second chapter is to study W(F_p^alg) as an analytic difference valued field. More generally, I show a field quantifier elimination theorem in the RV-language for -Henselian characteristic zero valued fields with an analytic structure. I also axiomatise the theory of W(F_p^alg) and I show that this theory is NIP.In the third chapter, I prove the density of definable types in certain enrichments of ACVF. From this result, I deduce a criterion for the elimination of imaginaries and the invariant property. This chapter also contains abstract results on externally definable sets in NIP theories. In the last chapter, the previous chapter is applied to VDF, the model completion of valued fields with a valuation preserving derivation, to obtain the elimination of imaginaries in the geometric language, as well as the density of definable types and the invariant extension property. This chapter also contains considerations about definable functions, types and definable groupes in VDF
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Forey, Arthur. "Invariants motiviques dans les corps valués." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066557/document.
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Cette thèse est consacrée à définir et étudier des invariants motiviques associés aux ensembles semi-algébriques dans les corps valués. Ceux-ci sont les combinaisons booléennes d'ensembles définis par des inégalités valuatives. L'outil principal que nous utilisons est l'intégration motivique, une forme de théorie de la mesure à valeurs dans le groupe de Grothendieck des variétés définies sur le corps résiduel. Dans une première partie, on définit la notion de densité locale motivique. C'est un analogue valuatif du nombre de Lelong complexe, de la densité réelle de Kurdyka-Raby et de la densité p-adique de Cluckers-Comte-Loeser. C'est un invariant métrique à valeurs dans un localisé du groupe de Grothendieck des variétés. Notre résultat principal est que cet invariant se calcule sur le cône tangent muni de multiplicités motiviques. On établit un analogue de la formule de Cauchy-Crofton locale. On montre enfin que dans le cas d'une courbe plane, la densité motivique est égale à la somme des inverses des multiplicités des branches. L'objet de la seconde partie est de définir un morphisme d'anneau du groupe de Grothendieck des ensembles semi-algébriques sur un corps valué K vers le groupe de Grothendieck de la catégorie d'Ayoub des motifs rigides analytiques sur K. On montre qu'il étend le morphisme qui envoie la classe d'une variété algébrique sur la classe de son motif cohomologique à support compact. Cela fournit donc une notion virtuelle de motif cohomologique à support compact pour les variétés rigides analytiques. On montre également un théorème de dualité permettant de comparer le motif cohomologique de la fibre de Milnor analytique avec la fibre de Milnor motiviqueThis thesis is devoted to define and study some motivic invariants associated to semialgebraic sets in valued fields. They are boolean combinations of sets defined by valuative inequalities. Our main tool is the theory of motivic integration, which is a kind of measure theory with values in the Grothendieck group of varieties defined over the residue field. In the first part, we define the notion of motivic local density. It is a valuative analog of complex Lelong number, Kurdyka-Raby real density and p-adic density of Cluckers- Comte-Loeser. It is a metric invariant with values in a localization of the Grothendieck group of varieties. Our main result is that it can be computed on the tangent cone with motivic multiplicities. We also establish an analog of the local Cauchy-Crofton formula. We finally show that the density of a germ of plane curve defined over the residue field is equal to the sum of the inverses of the multiplicities of the formal branches of the curve. The goal of the second part is to define a ring morphism from the Grothendieck group of semi-algebraic sets defined over a valued field K to the Grothendieck group of Ayoub’s categoryof rigid analytic motives over K. We show that it extends the morphism sending the class of an algebraic variety to the class of its cohomological motive with compact support. This gives a notion of virtual cohomological motive with compact support for rigid analytic varieties. We also show a duality theorem allowing us to compare the cohomological motive of the analytic Milnor fiber with the motivic Milnor fiber
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Stroder, Miriam Elizabeth. "Effects of Culturally Responsive Teaching Practices on the Literacy Learning of Latino Students." TopSCHOLAR®, 2008. http://digitalcommons.wku.edu/cgi/query.cgi?field_1=lname&value_1=Stroder&field_2=fname&value_2=Miriam&field_3=institution&value_3=Western%20Kentucky%20University&advanced=1.
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GOMEZ-CALDERON, JAVIER. "POLYNOMIALS WITH SMALL VALUE SET OVER FINITE FIELDS." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183933.
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Let K(q) be the finite field with q elements and characteristic p. Let f(x) be a monic polynomial of degree d with coefficients in K(q). Let C(f) denote the number of distinct values of f(x) as x ranges over K(q). It is easy to show that C(f) ≤ [|(q - 1)/d|] + 1. Now, there is a characterization of polynomials of degree d < √q for which C(f) = [|(q - 1)/d|] +1. The main object of this work is to give a characterization for polynomials of degree d < ⁴√q for which C(f) < 2q/d. Using two well known theorems: Hurwitz genus formula and Andre Weil's theorem, the Riemann Hypothesis for Algebraic Function Fields, it is shown that if d < ⁴√q and C(f) < 2q/d then f(x) - f(y) factors into at least d/2 absolutely irreducible factors and f(x) has one of the following forms: (UNFORMATTED TABLE FOLLOWS) f(x - λ) = D(d,a)(x) + c, d|(q² - 1), f(x - λ) = D(r,a)(∙ ∙ ∙ ((x²+b₁)²+b₂)²+ ∙ ∙ ∙ +b(m)), d|(q² - 1), d=2ᵐ∙r, and (2,r) = 1 f(x - λ) = (x² + a)ᵈ/² + b, d/2|(q - 1), f(x - λ) = (∙ ∙ ∙((x²+b₁)²+b₂)² + ∙ ∙ ∙ +b(m))ʳ+c, d|(q - 1), d=2ᵐ∙r, f(x - λ) = xᵈ + a, d|(q - 1), f(x - λ) = x(x³ + ax + b) + c, f(x - λ) = x(x³ + ax + b) (x² + a) + e, f(x - λ) = D₃,ₐ(x² + c), c² ≠ 4a, f(x - λ) = (x³ + a)ⁱ + b, i = 1, 2, 3, or 4, f(x - λ) = x³(x³ + a)³ +b, f(x - λ) = x⁴(x⁴ + a)² +b or f(x - λ) = (x⁴ + a) ⁱ + b, i = 1,2 or 3, where D(d,a)(x) denotes the Dickson’s polynomial of degree d. Finally to show other polynomials with small value set, the following equation is obtained C((fᵐ + b)ⁿ) = αq/d + O(√q) where α = (1 – (1 – 1/m)ⁿ)m and the constant implied in O(√q) is independent of q.
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Ai, Xiaohua. "Arithmetic of values of L-functions and generalized multiple zeta values over number fields." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066394/document.
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L'objectif principal de cette thèse est de généraliser les multizetas au cas où le corps de base Q est remplacé par un corps de nombres quelconque. La motivation derrière cette construction vient des travaux de A. Goncharov sur les corrélateurs de Hodge et de la philosophie plectique de J. Nekovar et A. Scholl. On commence par la construction des fonctions de Green plectiques supérieures. Hecke a prouvé que l'intégration d'une série d'Eisenstein appropriée sur le groupe de classes des idèles du corps de nombres donné, multipliée par un caractère du groupe des classes des idèles, est équale à la fonction L associée à ce caractère. Remplacant la série d'Eisenstein par les fonctions de Green plectiques supérieures, une intégration similaire donne des nouveaux résultats, qui généralisent les multizetas classiques et les multi-polylogarithmes. D'après le principe plectique, un sous-groupe de l'anneau des entiers du corps de nombres donné joue un rôle essentiel dans ces travauxThe principal objective of this thesis is to generalize multiple zeta values to the case when the ground field Q is replaced by an arbitrary number field. The motivation behind the construction comes from the work of A. Goncharov on Hodge correlators and the plectic philosophy of J. Nekovar and A. Scholl. We start by constructing the higher plectic Green functions. Hecke once proved that the integral of the restriction of a suitable Eisenstein series over $\mathbb{Q}$ to the idele class group of a given number field multipled an idele class character of finite order is equal to the L-function of this charator. By replacing Eisenstein seris with our higher plectic Green functions, a similar integration gives new results, which give the generalization of classical multiple zeta values and multiple polyloarithms. According to the plectic principle, a non-trivial subgroup of the ring of integers of a given number field plays an essential role in this work
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Genik, A. M., and Y. G. Stezhko. "The informaation technologies value for diverse fields of activity." Thesis, КНУТД, 2016. https://er.knutd.edu.ua/handle/123456789/5050.
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Sneltvedt, Tommy. "Sequential value information for Markov random field." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13500.
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MARTINS, JULIANA ABUZAGLO ELIAS. "AUTHORSHIP: CONCEPTS AND VALUES IN THE DESIGN FIELD." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2010. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35604@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROFUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
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Este trabalho tem por objetivo pensar o conceito de autor, os principais valores comumente a ele relacionados e como estas noções estão presentes no campo do design. Para isso, num primeiro momento, buscamos estabelecer algumas definições do que venham a significar ou remeter, tanto o termo autor como design. Em outras palavras, objetivamos apontar quais são alguns dos termos chaves normalmente relacionados tanto a um autor quanto ao design. Assim podemos perceber que existem valores em comum que são associados a ambos os termos como: criatividade, individualidade, criação e coletividade. Num segundo momento, oferecemos alguns exemplos de manifestações ocorrentes dentro do campo do design onde podemos verificar a presença destes valores, ou seja, exemplos que ilustrariam como a autoria é uma questão importante para o campo de design. Os exemplos são: o design assinado, a propriedade intelectual e o design social. Após os exemplos, nos propomos a analisar e debater diretamente sobre alguns dos valores de autoria anteriormente mencionados, presentes tanto nas definições como nos exemplos, são eles: individualidade, criação e criatividade. Por fim, tentamos refletir sobre as possíveis razões para a permanência destes valores autorais.
This dissertation is aimed at reflecting the concept of author, the main values commonly related to it and how these concepts are present in the field of design. For this, at first, we sought to establish some definitions of what may mean or refer the terms author and design. In other words, we aim to point out what are some of the key terms usually related either to author or design. Thus, we can see that there are common values that are associated with both terms as creativity, individuality, creation and community. After that, we offer some examples of events occurring within the field of design where it can be verified the presence of these values, ie, examples that illustrate how the authorship is an important issue for the field of design. The examples are: the design signed, intellectual property and social design. After the examples, we propose to examine and discuss directly some of the values of authorship mentioned above, present in both settings as in the examples, they are: individuality, creation and creativity. Finally, we try to reflect on the possible reasons for the continuing of these values.
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Ahmed, Samah. "Perturbation field theory methods for calculating expectation values." Thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/26214.
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Smith, James Raphael. "A vectorised Fourier-Laplace transformation and its application to Green's tensors." Thesis, Lancaster University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296967.
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Kallestad, Tommy. "Social Work Values : Empowerment, organizational values & professional doxa inside the social work field." Thesis, Mälardalens högskola, Akademin för hälsa, vård och välfärd, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-55153.
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This study explores the field of social work values in the social work profession. The aim of the study is to explore how social work values are related to empowerment practices and organizational structures inside the social work field. By using the perspective of empowerment and professional doxa these structures inside the social work field are explored in interviews with nine social workers. These nine interviews show how social workers relate to values insides their profession, how empowerment practices are done, and what kind of organizational conflicts social workers may experience. By using the perspectives of empowerment and professional doxa the interviews been analysed and connected to both local and global concerns for the social work field. Many professional conflicts were found by taking these perspectives that are discussed in this study, as for example role conflicts social workers could experience. Other conflicts were those of structural failures that caused harm to client contacts and economic factors that were deemed more important for organizations than good client outcomes.
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BURUNGALE, ASHAY A., and HARUZO HIDA. "ANDRÉ–OORT CONJECTURE AND NONVANISHING OF CENTRAL -VALUES OVER HILBERT CLASS FIELDS." CAMBRIDGE UNIV PRESS, 2016. http://hdl.handle.net/10150/621414.
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Let F/Q be a totally real field and K/F a complex multiplication (CM) quadratic extension. Let I he a cuspidal Hilbert modular new form over F. Let lambda he a Ilecke character over K such that the Rankin Selherg convolution f with the theta-series associated with lambda is self-dual with root number 1. We consider the nonvanishing of the family of central-critical Rankin Selberg L-values L(1/2, f circle times lambda(chi)), as chi varies over the class group characters of K. Our approach is geometric, relying on the Zariski density of CM points in self-products of a Hilbert modular Shimura variety. We show that the number of class group characters chi such that L(1/2, f circle times lambda(chi)) not equal 0 increases with the absolute value of the discriminant of K. We crucially rely on the Andre-Oort conjecture for arbitrary self-product of the Hilbert modular Shimura variety. In view of the recent results of Tsitnertnan, Yuan Zhang and Andreatta-Goren-Howard-Pera, the results are now unconditional. We also consider a quaternionic version. Our approach is geometric, relying on the general theory of Shimura varieties and the geometric definition of nearly holomorphic modular forms. In particular, the approach avoids any use of a suhconvex hound for the Rankin Selberg L-values. The Waklspurger formula plays an underlying role.
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Witte, Malte. "Noncommutative Iwasawa Main Conjectures for Varieties over Finite Fields." Doctoral thesis, Universitätsbibliothek Leipzig, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:15-20090610-144827-5.
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We state and prove an analogue for varieties over finite fields of T. Fukaya's and K. Kato's version of the noncommutative Iwasawa main conjecture. Moreover, we explain how this statement can be reinterpreted in terms of Waldhausen K-theory.
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Claessens, Sten. "Solutions to ellipsoidal boundary value problems for gravity field modelling." Thesis, Curtin University, 2006. http://hdl.handle.net/20.500.11937/1637.
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The determination of the figure of the Earth and its gravity field has long relied on methodologies that approximate the Earth by a sphere, but this level of accuracy is no longer adequate for many applications, due to the advent of new and advanced measurement techniques. New, practical and highly accurate methodologies for gravity field modelling that describe the Earth as an oblate ellipsoid of revolution are therefore required. The foundation for these methodologies is formed by solutions to ellipsoidal geodetic boundary-value problems. In this thesis, new solutions to the ellipsoidal Dirichlet, Neumann and second-order boundary-value problems, as well as the fixed- and free-geodetic boundary-value problems, are derived. These solutions do not rely on any spherical approximation, but are nevertheless completely based on a simple spherical harmonic expansion of the function that is to be determined. They rely on new relations among spherical harmonic base functions. In the new solutions, solid spherical harmonic coefficients of the desired function are expressed as a weighted summation over surface spherical harmonic coefficients of the data on the ellipsoidal boundary, or alternatively as a weighted summation over coefficients that are computed under the approximation that the boundary is a sphere.Specific applications of the new solutions are the computation of geopotential coefficients from terrestrial gravimetric data and local or regional gravimetric geoid determination. Numerical closed-loop simulations have shown that the accuracy of geopotential coefficients obtained with the new methods is significantly higher than the accuracy of existing methods that use the spherical harmonic framework. The ellipsoidal corrections to a Stokesian geoid determination computed from the new solutions show strong agreement with existing solutions. In addition, the importance of the choice of the reference sphere radius in Stokes's formula and its effect on the magnitude and spectral sensitivity of the ellipsoidal corrections are pointed out.
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Roberts, Nick Stuart. "Earthquake distributions at volcanoes : models and field observations." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/23653.
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Volcanic earthquakes can provide significant insight into physical processes acting at volcanoes, such as magma accumulation and the mechanisms of deformation of the volcanic edifice. At the same time a statistical analyses of volcanic seismicity prior to an eruption (for example variations in the Gutenberg-Richter b-value – a measure of the proportion of large and small events) are a key component of the practical problem of forecasting eruptions. This thesis aims to tackle two key areas of research that are closely related to these important overall goals, by comparing seismic data obtained from currently-active volcanoes with direct field observation of faulting and fracturing from an exhumed extinct volcano. First I introduce a new approach that improves the accuracy and reliability of calculating spatial and temporal variations of the seismic b-value for frequency-magnitude distributions at active volcanoes, and apply it to several test cases. An extensive literature review highlights a large variability and lack of standardisation of methodology used to analyse frequency-magnitude distributions in the past. Motivated by this, I introduce and test a new workflow to standardise calculating completeness magnitudes of seismic catalogues. The review also highlights the fact that uncertainties in estimating the threshold magnitude of complete reporting have been ignored to date. Here I use synthetic catalogues to quantify this previously unidentified source of error, and provide a template to estimate the total error in b-value. In standard analysis it is also common to sample time windows subjectively, although this can introduce bias. Here I develop a new objective, iterative sampling method that calculates the b-value as a full probability density function which need not have a Gaussian error structure. Application of this method reveals ‘mode-switching’ behaviour for the first time in volcanic seismic catalogues. The results also show b-values often do have a value indistinguishable from that of tectonic seismicity (b=1 within error). Nevertheless there are also several robust examples of real high b-values, as high as 3.3. The second part of the study is based on a field campaign to investigate the fracture zones from an exhumed volcanic setting on the Isle of Rum, NW Scotland. Lithological and structural mapping is used to collect structural data that is then used to quantify and explain complex fracture patterns and the underlying intra-magma chamber processes that occurred there in the geological past. In particular I identify a singular collapse event within the youngest volcanic unit, the Central Intrusion. This is responsible for forming the observed igneous breccias and the lineaments on satellite images that I interpret as contemporaneous faults. Using appropriate scaling relations, I infer the b-value for the Rum lineaments data. This would have been relatively high, at a value of approximately 1.9. The final part of the study compares the fracture data on Rum to earthquake distributions at El Hierro volcano, Canary Islands. Here I show the level of fractal clustering is similar in both an extinct (60 Ma) and a currently active volcano. Both show similar high levels of clustering. However, in both cases there is a difference between the capacity and correlation dimensions (D₀≠D₂), implying the set of rupture sources or mapped fault traces form a multi-fractal set. Broadly, the scaling of fracture sets in an ancient volcano has similar properties to those observed in a modern volcano, except that the Rum data imply a greater absolute degree of spatial clustering of deformation than that for the recent unrest at El Hierro.
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Vipond, Prudence Margaret. "The landscape and settlement of south-west Cheshire : a case study of seventeen townships in the Dee Valley." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366972.
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Beeken, C. B. E. "Periodic Schroedinger operators in dimension two : constant magnetic fields and boundary value problems." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394993.
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Claessens, Sten. "Solutions to ellipsoidal boundary value problems for gravity field modelling." Curtin University of Technology, Department of Spatial Sciences, 2006. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=16850.
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The determination of the figure of the Earth and its gravity field has long relied on methodologies that approximate the Earth by a sphere, but this level of accuracy is no longer adequate for many applications, due to the advent of new and advanced measurement techniques. New, practical and highly accurate methodologies for gravity field modelling that describe the Earth as an oblate ellipsoid of revolution are therefore required. The foundation for these methodologies is formed by solutions to ellipsoidal geodetic boundary-value problems. In this thesis, new solutions to the ellipsoidal Dirichlet, Neumann and second-order boundary-value problems, as well as the fixed- and free-geodetic boundary-value problems, are derived. These solutions do not rely on any spherical approximation, but are nevertheless completely based on a simple spherical harmonic expansion of the function that is to be determined. They rely on new relations among spherical harmonic base functions. In the new solutions, solid spherical harmonic coefficients of the desired function are expressed as a weighted summation over surface spherical harmonic coefficients of the data on the ellipsoidal boundary, or alternatively as a weighted summation over coefficients that are computed under the approximation that the boundary is a sphere.Specific applications of the new solutions are the computation of geopotential coefficients from terrestrial gravimetric data and local or regional gravimetric geoid determination. Numerical closed-loop simulations have shown that the accuracy of geopotential coefficients obtained with the new methods is significantly higher than the accuracy of existing methods that use the spherical harmonic framework. The ellipsoidal corrections to a Stokesian geoid determination computed from the new solutions show strong agreement with existing solutions. In addition, the importance of the choice of the reference sphere radius in Stokes's formula and its effect on the magnitude and spectral sensitivity of the ellipsoidal corrections are pointed out.
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O'Malley, Paul W. "Understanding Formation and Evolution of Dune Fields by Spatial Mapping and Analysis: Upper Muskegon River Valley, Michigan." Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1557841176226706.
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Ulrich, David F. "Winning Off The Field: The Determinants of MLB Franchise Value." Scholarship @ Claremont, 2011. http://scholarship.claremont.edu/cmc_theses/292.
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This paper examines the underlying drivers of MLB franchise value. Using panel data for MLB teams from 2000-2010, I find that a team’s ballpark and metro-area market are significant determinants, yet revenues truly drive value. Further, I find that incremental increases in winning percentage by a particular team has an insignificant effect on total revenues and has no marginal impact on the value of the team, particularly if the team recognizes consistent revenue streams every year. Finally, I show that the modern sabermetric approach to player management negatively impacts firm value, suggesting that although small market teams have been successful using this strategy to increase their on-field performance, its use in isolation is not financially beneficial to the organization in the long run.
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Claessens, Sten Johan. "Solutions to ellipsoidal boundary value problems for gravity field modelling /." Full text available, 2006. http://adt.curtin.edu.au/theses/available/adt-WCU20070206.164857.
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Zachlin, Paul Francis. "On the Field of Values of the Inverse of a Matrix." Case Western Reserve University School of Graduate Studies / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=case1181231690.
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Smith, Barry Ried. "On the values of equivariant and Artin L-functions of cyclic extensions of number fields." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3259632.
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Thesis (Ph. D.)--University of California, San Diego, 2007.Title from first page of PDF file (viewed June 11, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 177-181).
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Longhi, Ignazio. "Non-archimedean integration and special values of L-functions for elliptic curves over function fields." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36821.
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Let F be a global function field of characteristic p, infinity a fixed place of F. The analytic uniformization of elliptic curves in characteristic p by means of Drinfeld modular curves is used to associate to an elliptic curve E over F with split multiplicative reduction at infinity a measure muE on P1Finfinity . By choosing an appropriate embedding of a quadratic extension K/F into the matrix algebra M 2(F), the measure muE is pushed forward to a measure on the p-adic group G, isomorphic to an anticyclotomic Galois group over the Hilbert class field of K. It is proven that integration of this measure yields the L -invariant of E at infinity , when infinity is split in K, and a Heegner point in E if infinity is inert. An interpretation of these results in terms of special values of L-functions is suggested.
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Pope, Andrew L. "A Study of Field Training Programs in the Ohio Valley Region." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1363553281.
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Stanley, Ross James. "Quantum propagation and initial value problems in curved space." Thesis, Swansea University, 2012. https://cronfa.swan.ac.uk/Record/cronfa42356.
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Quantum field theory is studied within the semi-classical gravity approximation. The quantum correction to the propagation of both photons and gravitons in a general curved space background is calculated showing a non-trivial spacetime refractive index as well as a dynamical dressing (or undressing) of the particle state. The initial interacting particle's 'dressing', the cloud of virtual particles that surrounds it, may receive corrections from an infinite number of modes even for flat space. When gravitational tidal effects remove this dressing, squeezing it back into the bare particle, this leads to an amplification in a way consistent with unitarity. There is a possible shift discovered in the graviton wavefront velocity related to higher order curvature couplings, although in this calculation there is also a logarithmic divergence at high frequencies, leading to a breakdown of the perturbative approximation. Next we consider initial value problems and the stability of de Sitter space. Here the self decay of a massive scalar in de Sitter space is proposed to lead to a particle explosion where divergent growth of the field expectation value is observed. Directly investigating this divergent field expectation value a one loop calculation is completed for a massive scalar particle in 3-dimensional de Sitter space. This result has characteristic secular growth that can be summed into a rapidly decaying exponential by using the dynamical renormalisation group. Finally the evolution of two point functions is studied, by numerically solving their equations of motion using the Kaydanoff-Baym equations in 2-dimensional de Sitter space. Here we see a decay of the vacuum state due to the coupling. This appears to be related to the choice of initial conditions be chosen to match the free field vacuum plus non-interacting particles. This choice is made inappropriate by the dynamical dressing of the bare particle states.
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Pyakurel, Sandeep. "3D P- and converted shear wave characteristics of the Morrow production trend in the Buffalo Valley field, Chaves-Eddy County, New Mexico." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4256.
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Thesis (M.S.)--West Virginia University, 2005.Title from document title page. Document formatted into pages; contains xi, 145 p. : ill. (some col.), maps (some col.). Includes abstract. Includes bibliographical references (p. 141-145).
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Aggrey, George Hayford. "A study of intelligent oil and gas fields' real time optimisation and its value quantification." Thesis, Heriot-Watt University, 2007. http://hdl.handle.net/10399/60.
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The thesis, "Intelligent Fields Added Value Quantification and Real Time Value Creation", covers the "added value" evaluation process and a novel extension of the use of real time pressure data of Intelligent Fields. Intelligent well completion technologies add value via real time optimisation and provide flexibility for future well control. The correct "value adding" evaluation must be developed to become part of the general optimisation process. Hence understanding the value added, which is dependent on the three main factors of additional cost, reliability and equipment functionality. is key to the success of Intelligent Well Technology (I WT). This thesis explores the added value quantification criteria and develops a widely applicable software for quantifying the value added by Intelligent Well Technology and Sensor applications. The work explores and compares the various valuation criteria and their applicability to "Added Value from IWT" whilst modelling the application in various reservoir environments. The importance of the future equipment functionality in the value creation definition is investigated and rigorously factored into the value assessment. Current modelling and optimisation techniques were employed to show the values associated with intelligent completions and with various permanent downhole sensors. Appropriate use of intelligent production information is necessary to effectively contribute to improve operational performance. To achieve this, data driven management techniques such as Artificial Neural Network (ANN) with Wavelets and Time Series were used for the analysis of real time data to create the necessary information. Alternatively, a model driven approach (unlike NN "black" box) which considers the underlying physics of fluid flow in the reservoir and realistically captures the wellborereservoir flow processes is used to show that real time downhole pressure can detect the time and source of water influx into a multi-zone horizontal or near horizontal completion thus permitting a more rapid response to water breakthrough.
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Nan, Tongchao. "Scaling and Extreme Value Statistics of Sub-Gaussian Fields with Application to Neutron Porosity Data." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/344220.
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My dissertation is based on a unified self-consistent scaling framework which is consistent with key behavior exhibited by many spatially/temporally varying earth, environmental and other variables. This behavior includes tendency of increments to have symmetric, non-Gaussian frequency distributions characterized by heavy tails that often decay with lag; power-law scaling of sample structure functions (statistical moments of absolute increments) in midranges of lags, with breakdown in power-law scaling at small and/or large lags; linear relationships between log structure functions of successive orders at all lags, also known as extended self-similarity; and nonlinear scaling of structure function power-law exponents with function order. The major question we attempt to answer is: given data measured on a given support scale at various points throughout a 1D/2D/3D sampling domain, which appear to be statistically distributed and to scale in a manner consistent with that scaling framework, what can be said about the spatial statistics and scaling of its extreme values, on arbitrary separation or domain scales? To do so, we limit our investigation in 1D domain for simplicity and generate synthetic signals as samples from 1D sub-Gaussian random fields subordinated to truncated monofractal fractional Brownian motion (tfBm) or truncated fractional Gaussian noise (tfGn). Such sub-Gaussian fields are scale mixtures of stationary Gaussian fields with random variances that we model as being log-normal or Lévy α/2-stable. This novel interpretation of the data allows us to obtain maximum likelihood estimates of all parameters characterizing the underlying truncated sub-Gaussian fields. Based on synthetic data, we find these samples conform to the aforementioned scaling framework and confirm the effectiveness of generation schemes. We numerically investigate the manner in which variables, which scale according to the above scaling framework, behave at the tails of their distributions. Ours is the first study to explore the statistical scaling of extreme values, specifically peaks over thresholds or POTs, associated with such families of sub-Gaussian fields. Before closing this work, we apply and verify our analysis by investigating the scaling of statistics characterizing vertical increments in neutron porosity data, and POTs in absolute increments, from six deep boreholes in three different depositional environments.
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Cosio, Sergio Javier 1958. "Infiltration into stratified alluvium : a comparison between simulated values and field measurements." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/191968.
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The computer model UNSAT2 for unsaturated water flow is used to complement a field study conducted at the University of Arizona Water Resources Research Center Field Laboratory during influent seepage along the Santa Cruz River during the runoff events on the Winter of 1967-1968. Field measurements accomplished by a neutron moisture logger showed that the hydrogeologic characteristics governing the movement and storage of subsurface flow are somewhat uniform throughout the area. The mathematical model provides a two-dimensional transient saturated-unsaturated analysis of the subsurface flow at the field site. The results attained using a conceptualized flow region proved to be an acceptable aid to a unified interpretation of the field measurements. Because boundary conditions are time and space dependent, the sensitivity to boundary conditions prevented the successful model calibration, although not its applicability. This, together with more serious limitations on data availability and computer capacity, precluded the imminent use of the computer model UNSAT2 for this individual research site.
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Kaya, Egemen Tangut. "Estimation Of Expected Monetary Values Of Selected Turkish Oil Fields Using Two Different Risk Assessment Methods." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1091495/index.pdf.
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Most investments in the oil and gas industry involve considerable risk with a wide range of potential outcomes for a particular project. However, many economic evaluations are based on the &ldquomost likely&rdquo
results of variables that could be expected without sufficient consideration given to other possible outcomes and it is well known that initial estimates of all these variables have uncertainty. The data is usually obtained during drilling of the initial oil well and the sources are geophysical (seismic surveys) for formation depths and areal extent of the reservoir trap, well logs for formation tops and bottoms, formation porosity, water saturation and possible permeable strata, core analysis for porosity and saturation data and DST (Drill-Stem Test) for possible oil production rates and samples for PVT (Pressure Volume Temperature) analysis to obtain FVF (Formation Volume Factor) and others. The question is how certain are the values of these variables and what is the probability of these values to occur in the reservoir to evaluate the possible risks. One of the most highly appreciable applications of the risk assessment is the estimation of volumetric reserves of hydrocarbon reservoirs. Monte Carlo and moment technique consider entire ranges of the variables of Original Oil in Place (OOIP) formula rather than deterministic figures. In the present work, predictions were made about how statistical distribution and descriptive statistics of porosity, thickness, area, water saturation, recovery factor, and oil formation volume factor affect the simulated OOIP values. The current work presents the case of two different oil fields in Turkey. It was found that both techniques produce similar results for 95%. The difference between estimated values increases as the percentages decrease from 50% and 5% probability.
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Owens, Paula. "Fields of meaning : an enquiry into the development of environmental values in the early school years." Thesis, University of Kent, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422734.
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Guter-Sandu, Andrei. "Leveraging social value : multiple valuation logics in the field of social finance." Thesis, City, University of London, 2018. http://openaccess.city.ac.uk/20214/.
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What are the mechanisms behind the advance of financial actors, instruments, and models into the field of social policy design and delivery? Over the past couple of decades, the state’s function as provider of welfare and safety nets against various forms of socio-economic risk has been transformed not just by privatisation or downsizing, but also by the advent of alternative forms of social policy delivery. One example of the latter is social impact investment, a form of investing in social programmes with the intent of pursuing social (and environmental) impact alongside financial return, and yielding innovative financial instruments such as social impact bonds, social stocks, or community bonds. The emergence of this field is generally seen as an outcome of the broader process of financialisation. From this perspective, both financial return and social policy objectives can be achieved via the straightforward implementation of existing financial instruments and methodologies. However, the very process of implicating existing financial technologies in the sphere of the pursuit of social outcomes generates its own set of dynamics. This study focuses on these dynamics from the perspective of the valuation processes underpinning the emergence of social impact investment. It argues that as finance engulfs this field, it engages in a valuation process of fashioning and delineating a hybridised form of value – blended value – supporting its advance, which is distinctly separate, though not independent, from financial value creation. The result of this process is the concomitant proliferation of non-financial spaces of valuation, which come not to replace, but to accompany and support financialisation. In order to make this argument, it looks at the case of the valuation processes undergirding the launch of the world’s first social impact bond in 2010 in the UK. Besides providing an empirical account of the latter, it also makes a theoretical contribution to the literature on financialisation by deepening the understanding of the manner in which financial actors, instruments, and markets advance in non-financial realms.
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Li, Qiuyuan Jimmy. "The value of field experiments in estimating demand elasticities and maximizing profit." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91105.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 99-101).
In many situations, the capabilities of firms are better suited to conducting and analyzing field experiments than to analyzing sophisticated demand models. However, the practical value of using field experiments to optimize marketing decisions remains relatively unstudied. We investigate category pricing decisions that require estimating a large matrix of cross-product demand elasticities and ask: how many experiments are required as the number of products in the category grows? Our main result demonstrates that if the categories have a favorable structure, then we can learn faster and reduce the number of experiments that are required: the number of experiments required may grow just logarithmically with the number of products. These findings potentially have important implications for the application of field experiments. Firms may be able to obtain meaningful estimates using a practically feasible number of experiments, even in categories with a large number of products. We also provide a relatively simple mechanism that firms can use to evaluate whether a category has a structure that makes it feasible to use field experiments to set prices. We illustrate how to accomplish this using either a sample of historical data or a pilot set of experiments. Historical data often suffer from the problem of endogeneity bias, but we show that our estimation method is robust to the presence of endogeneity. Besides estimating demand elasticities, firms are also interested in using these elasticities to choose an optimal set of prices in order to maximize profits. We formulate the profit maximization problem and demonstrate that substantial profit gains can also be achieved using a relatively small number of experiments. In addition, we discuss how to evaluate whether field experiments can help optimize other marketing decisions, such as selecting which products to advertise or promote. We adapt our models and methodologies to this setting and show that the main result that relatively few experiments are needed to estimate elasticities and to increase profits continues to hold.
by Jimmy Qiuyuan Li.
Ph. D.
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Won, Sungjun. "Understanding College Students’ Sense of Belonging and Persistence in STEM Fields From an Expectancy-Value Perspective." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555524009765307.
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St-Onge, Annie. "Economic values of traits for dairy cattle improvement estimated using field recorded data." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31546.
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The objective of this study was to compute economic values of traits for dairy cattle improvement using an empirical approach. Field recorded data were obtained from the Programme d'Analyse des Troupeaux Laitiers du Quebec (PATLQ) and genetic evaluation data were obtained from the Canadian Dairy Network (CDN). After the editing procedure, the data set consisted of 195,001 lifetime records of Holstein, Ayrshire, Jersey, Brown Swiss and Canadienne cows which calved for the first time between January 1980 and December 1994.Different profitability measurements were computed and used as the dependent variables in covariance model to compute different sets of economic values. Since the majority of cows produced 5 lactations or less, results obtained by using lifetime profits and profits until the end of the fifth lactation are similar. A kilogram genetic increase in fat production had higher economic values than the same increase in milk production in all breeds. A unit genetic increase in conformation had the highest positive impact on profit while a same increase in capacity had a negative impact on profit. Results obtained by using lifetime profit adjusted for the opportunity cost of postponed replacement showed that this adjustement reduced the influence of type traits on profit. Finally, profits of first lactations were used to study consequences of changes in pricing systems occurred in Quebec in August 1992. Economic values attached to protein production changed drastically. A kilogram genetic increase in protein production had negative economic values in the 80's and positive economic values after August 1992.
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Kretzer, Ursula M. H. "The value of information : the case of pre-auction exploration and development exploration of North Sea oil resources." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260661.
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Matsumoto, Kohji, and Yasutaka Ihara. "On L-functions over function fields: Power-means of error-terms and distribution of L'/L-values." Research Institute for Mathematical Sciences , Kyoto University, 2010. http://hdl.handle.net/2237/20335.
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Conover, Ross Robert. "Avian response to field borders in the Mississippi Alluvial Valley." Master's thesis, Mississippi State : Mississippi State University, 2005. http://library.msstate.edu/etd/show.asp?etd=etd-07062005-150014.
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Bondarenko, I. S., M. V. Rakhimova, О. Г. Аврунін, and L. A. Perekhoda. "Determination invivo concentration of nanosized drugs to reduce the value of their effective dose." Thesis, National university of pharmacy, 2020. http://openarchive.nure.ua/handle/document/12171.
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These abstracts describe a new acoustomagnetic method for determining the concentration of magnetic nanoparticles, alternative to the method of magnetic resonance imaging.
The proposed method for determining the concentration by the acoustomagnetic method can be further used to initiate the release of the drug delivered by magnetic nanoparticles in a constant magnetic field under the action of ultrasound as a result of the manifestation of the nanomechanical mechanism of drug release.
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Perry, Nicola Hazel. "The implications of improving the conservation value of field margins on crop production." Thesis, Open University, 1997. http://oro.open.ac.uk/57710/.
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The effect of field margin management on crop yield and weed biomass in the crop edge (headland) was investigated. Treatment did not have any significant effect on cereal yields, and taking a one metre strip out of crop production to establish a sterile, natural regeneration or sown strip, did not significantly reduce yields compared to cropping to the field edge. Conservation headlands generally contained greater amounts of weed biomass than fully sprayed headlands, but grain yields were not significantly reduced. Soil compaction affected yield in one of the field experiments, but not the other, where soil density values were fairly uniform. No relationship was found between fertiliser application and yield. In a survey of cereal headlands, distance from the field boundary was the most important factor affecting yield. Where yield increased with distance from the field boundary, there was a strong linear relationship with log distance (P < 0.001). Weed dry matter was related to distance, and there was a significant relationship between weed dry matter and grain yield in the first year of the survey (p < 0.001), but not in the second. Communities of herbaceous field margin species were established, and the effects of nitrogen fertiliser and sublethal glyphosate application were examined over two years. Cover abundance of grasses was greater than that of dicotyledonous species throughout. Bromus sterilis was the most abundant species in 1995, but by 1996 it had been replaced by Arrhenatherum elatius. Increasing fertiliser rate had a negative effect on total vegetation cover in 1995, due to individual plants lodging. During 1996, fertiliser application increased the cover abundance of the dominant perennial species A. e/atius (p < 0.001), and also the annuals B. sterilis and Galium aparine (p < 0.05). Sublethal doses of glyphosate significantly reduced total cover abundance (P < 0.001), and had a greater effect on grasses compared to dicotyledonous species. Measurement of spray drift into a hedgerow showed that positioning the end of the tractormounted spray boom 2m or 6m away from the crop edge reduced drift into the hedgebottom compared with spraying up to the crop edge (P < 0.001).
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Siekhaus, Daniel. "On value : reasoning, identity work, and collective action in the fields of performing arts and cultural heritage." Thesis, University of Cambridge, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709130.
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Kjaergaard, Lars. "Analyticity and scaling in quantum field theory." Thesis, Durham University, 2000. http://etheses.dur.ac.uk/4249/.
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The theory describing the scaling properties of quantum field theory is introduced. The symmetry principles behind scale and conformal transformations are reviewed together with the renormalisation group. A method for improving perturbative calculations of physical quantities in the infra-red limit is developed using general analyticity properties valid for all unitary quantum field theories. The infra-red limit of a physical quantity is shown to equal the limiting value of the Borel transform in a complex scale parameter, where the order of the Borel transform is related to the domain of analyticity. It is shown how this general result can be used to improve perturbative calculations in the infra-red limit. First, the infra-red central charge of a perturbed conformal field theory is considered, and for the unitary minimal models perturbed by ɸ(1,3) the developed approximation is shown to be very close to the exact results by improving only a one loop perturbation. The other example is the infra-red limit of the critical exponents of x(^4) theory in three dimensions, where our approximation is within the limits of other approximations. The exact renormalisation group equation is studied for a theory with exponential interactions and a background charge. It is shown how to incorporate the background charge, and using the operator product expansion together with the equivalence between the quantum group restricted sine-Gordon model and the unitary minimal models perturbed by ɸ(1,3), the equation obtained is argued to describe the flow between unitary minimal models. Finally, a semi-classical approximation of the low energy limit of a bosonic membrane is studied where the action is taken to be the world-volume together with an Einstein-Hilbert term. A solution to the linearized equations of motion is determined describing a membrane oscillating around a flat torus.
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Zhang, Jindong. "Nonlinear dynamic analysis and optimal control of shallow shells by field-boundary-element approach." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/32961.
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Buller, Judy Lynn. "How the field of media ethics addresses the influence of economics on journalism values." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2002. http://wwwlib.umi.com/cr/utexas/fullcit?p3077426.
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