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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
51

Mapping properties of multi-parameter multipliers

Bakas, Odysseas January 2017 (has links)
This thesis is motivated by the problem of understanding the endpoint mapping properties of higher-dimensional Marcinkiewicz multipliers. The one-dimensional case was definitively characterised by Tao and Wright. In particular, they proved that Marcinkiewicz multipliers acting on functions over the real line map the Hardy space H¹(ℝ) to L¹;∞(ℝ) and they locally map L log¹/² L to L¹;∞ and that these results are sharp. The classical inequalities of Paley and Zygmund involving lacunary sequences can be regarded as rudimentary prototypes of the aforementioned results of Tao and Wright on the behaviour of Marcinkiewicz multipliers "near" L¹(ℝ). Motivated by this fact, in Chapter 3 we obtain higher-dimensional variants of these two inequalities and we establish sharp multiplier inclusion theorems on the torus and on the real line. In Chapter 4 we extend the multiplier inclusion theorem on T of Chapter 3 to higher dimensions. In the last chapter of this thesis, we study endpoint mapping properties of the classical Littlewood-Paley square function which can essentially be regarded as a model Marcinkiewicz multiplier. More specifically, we give a new proof to a theorem due to Bourgain on the growth of the operator norm of the Littlewood- Paley square function as p → 1+ and then extend this result to higher dimensions. We also obtain sharp weak-type inequalities for the multi-parameter Littlewood- Paley square function and prove that the two-parameter Littlewood-Paley square function does not map the product Hardy space H¹ to L¹;∞.
52

Analýza algoritmu SQUFOF / Analysis of the SQUFOF algoritm

Langer, Lukáš January 2016 (has links)
This thesis deals with collecting facts and making the complete analysis of SQUFOF algorithm. In the beginning you can find a short hystorical re- view and then it continues with desribing how the binary quadratic forms, which represents the number N, continued fractions of √ N, ideals in the ring Z( √ N) and lattices in Q( √ N) are related. This thesis offers the tools usable to switch between these structures and finally it uses these tools to show, how the algorithm SQUFOF works. 1
53

The Use of the Power Method to Find Dominant Eigenvalues of Matrices

Cavender, Terri A. 07 1900 (has links)
This paper is the result of a study of the power method to find dominant eigenvalues of square matrices. It introduces ideas basic to the study and shows the development of the power method for the most well-behaved matrices possible, and it explores exactly which other types of matrices yield to the power method. The paper also discusses a type of matrix typically considered impossible for the power method, along with a modification of the power method which works for this type of matrix. It gives an overview of common extensions of the power method. The appendices contain BASIC versions of the power method and its modification.
54

Re-programming public space

Bjornstad, Jensen Arne 13 March 2007 (has links)
No abstract available. Copyright 2006, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. Please cite as follows: Bjornstad, JA 2006, Re-programming public space, MArch(Prof) dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-03132007-180909/ > / Dissertation (MArch (Prof))--University of Pretoria, 2007. / Architecture / unrestricted
55

Evaluación de un diseño en Lattice Square como alternativa a los métodos actuales en la mejora de líneas de arroz

Marqués Falcó, Luis 01 September 2015 (has links)
[EN] Ability for doing an effective sampling is the best characteristic to choose a field breeding design. Quantitative characters are highest inheritable when plants are cultivated in isolation conditions in fields. This work try to validate a field design for rice breeding which combines lattice design with isolation conditions. It has been used a rice double haploid (DH) population obtained from the cross between the rice varieties Benisants and Gigante Vercelli. DaRT analysis was done to obtain 465 SNPs between the two parents. DH lines, both parents and a reference variety, Gleva, were studied in two field trials. Phenotypic differences were statistically significant, even with a 66 % of repeats decrease. The association of all morphological traits was estimated by phenotypic Correlation Coefficient and showed positive relation between Total Weight of plant, Tiller Number and Total Number of grains per panicle with Grain Weight. The results of Principal Components Analysis were closely in line with Correlation Analysis. Cluster Analysis classified the totally of the lines into four distinct groups. Similar results were obtained in the DaRT representation. Six lines, both parents and the reference variety were analyzed with Lattice Design and Randomized Complete Block Design (RCBD). Coefficient of Variation of lattice design is 9,8 % while that of RCBD is 14,1 %, which proves the best efficiency of Lattice design. Also, Lattice design is more economical, using a 94 % less plants front RCBD. / [ES] El criterio básico para la elección de un diseño de selección debe ser su capacidad para poder efectuar un muestreo efectivo dentro de unas condiciones ambientales heterogéneas. La evaluación y selección en condiciones de cultivo aisladas entre plantas permite la optimización de la heredabilidad para caracteres cuantitativos. El presente trabajo trata de validar un nuevo diseño de campo para la selección de nuevas variedades de arroz en lattice square y con un marco de plantación de 0,5 x 0,5 m entre plantas, frente al diseño usualmente utilizado de bloques al azar, con marco de plantación similar a las condiciones normales de cultivo. Se utilizó una población de dobles haploides, derivada de un cruzamiento entre las variedades Benisants y Gigante Vercelli. La población de partida fue analizada genéticamente mediante un análisis DaRT que proporcionó 465 SNPs entre los dos progenitores, y que permitió su clasificación mediante un dendograma. Se realizó un ensayo principal durante dos años consecutivos en la zona de Valencia con la población total, donde se obtuvieron diferencias estadísticamente significativas en la caracterización fenotípica de las líneas. Estas diferencias significativas se mantuvieron, incluso disminuyendo en un 66 % el número de repeticiones utilizadas. El estudio de las Correlaciones entre todas las variables relacionadas con el Rendimiento en Grano mostró que este aumenta con el Peso Total de la planta y sus caracteres asociados: Número de tallos y Número de granos por panícula. El Análisis de Componentes Principales relacionó el Rendimiento en Grano fundamentalmente con el Número de Tallos por planta. El Dendograma realizado con los datos fenológicos de campo obtenidos clasificó 4 grupos de líneas de ensayo, relacionados con la expresión gráfica de los Componentes Principales y la clasificación genética efectuada a partir del análisis DaRT. En el ensayo comparativo realizado entre el diseño propuesto y un diseño en bloques al azar con una serie de líneas seleccionadas, el diseño en lattice obtuvo un Coeficiente de Variación del 9,8 % frente al 14,1 % del ensayo en bloques. Además, el número de plantas utilizado en el ensayo en lattice fue un 94 % inferior con el consiguiente ahorro económico en la evaluación de líneas de mejora. / [CAT] El criteri bàsic per a la elecció d'un disseny de selecció deu de ser la seua capacitat per a poder fer un mostreig efectiu dins d'unes condicions ambientals heterogènies. La evaluació i selecció en condicions de cultiu aïllades entre plantes permet la optimització de la heretabilitat per a caràcters quantitatius. El present treball trata de validar un nou disseny de camp pera la selecció de noves varietats d'arrós en Lattice Square i amb un marc de plantació similar a les condicions normals de cultiu. Es va utilitzar una població de línies doble haploides, derivada de un creuament entre les varietats Benisants i Gigante Vercelli. A més, una varietat de referència de la zona de València, Gleva, es va cultivar als assajos. La població de partida va ser analitzada genèticament mitjançant un anàlisis DaRT que va donar 465 SNPs entre els dos progenitors, y que va permetre la seua classificació mitjançant un dendograma. Es va realitzar un assaig principal duran dos anys consecutius en la zona de València amb la població total, on s'obtingueren diferencies estadísticament significatives en la caracterització fenotípica de les línies. Aquestes diferències significatives es mantingueren, inclús disminuint en un 66 % el número de repeticions utilitzades. El estudi de les Correlacions entre totes les variables relacionades amb el Rendiment en Gra va mostrar que aquest augmenta amb el Pes Total de la planta y els seus caràcters associats: Número de tiges i Número de grans per panícula. El Anàlisi de Components Principals va relacionar el Rendiment en Gra fundamentalment amb el Número de Tiges per planta. El Dendograma realitzat amb els datos fenològics de camp obtinguts va classificar quatre grups de línies de assaig, relacionades amb la expressió gràfica del Components Principals y la classificació genètica efectuada a partir del anàlisis DaRt. A l'assaig comparatiu realitzat entre el disseny proposat i un disseny en Blocs Complets a l'Atzar amb una sis línies DH, els dos parentals y la varietat de referència, el disseny en Lattice va obtindre un Coeficient de Variació del 9,8 % front al 14,1 % de l'assaig en Blocs. A més, el número de plantes utilitzat a l'assaig en Lattice va ser un 94 % inferior amb el consegüent estalvi econòmic a la avaluació de línies de millora. / Marqués Falcó, L. (2015). Evaluación de un diseño en Lattice Square como alternativa a los métodos actuales en la mejora de líneas de arroz [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/54123 / TESIS
56

Testing Gravity with MeerKAT and the SKA

Kopana, Mponeng January 2020 (has links)
>Magister Scientiae - MSc / The new 64-dish radio telescope array MeerKAT will be absorbed into the international Square Kilometre Array (SKA) in late 2020s. These two telescope arrays will produce three-dimensional maps of the integrated intensity of the 21cm emission from neutral hydrogen in galaxies, out to redshifts of 1:5 and 3 respectively. These maps contain a signature of the growth of large-scale structure in the Universe. This signature can be uncovered via redshift space distortions of the two-point correlation function, or power spectrum, of the 21cm brightness temperature uctuations. The growth rate governs the amplitude of the anisotropic signal from redshift-space distortions. It is a powerful probe of gravity and its measurement has the potential to test whether general relativity holds. We use models of the 21cm intensity and its power spectrum, starting from a simple linear model of redshift-space distortions and then extending to nonlinear models. With these models, we make Fisher forecast predictions of the precision with which MeerKAT and the SKA can measure the growth rate
57

Identity in transformation : re-programming Pretorius Square

Khan, Radhia 30 November 2010 (has links)
The experiences of the past can serve to enrich the knowledge of the present and progression to future generations. As such architecture should be viewed in accordance with literature, music, art and film as a collective depiction of the transition from past ideals to the contemporary values and future aspirations of a living city. Sites of historic importance within the Central Business District (CBD) will be investigated as qualitative research to determine the significance of these sites to current citizens. This will be used to determine the best location and manifestation of an intervention that will create a dialogue between the citizens of today and the urban landscape, encapsulating Pretoria’s history of social transition which indicates heritage as a living time line. / Dissertation (MArch(Prof))--University of Pretoria, 2010. / Architecture / unrestricted
58

Public Power : Within our commons

Ingman Åström, Liza January 2021 (has links)
The Greek agora was created as an invitation to participate in the life of the city and it functioned as the heart of the city and its citizens. I want to bring this back into our commons of the city, by activating it and creating more meeting places.This project started out as a wish to activate our public spaces, and during the first study, I found that we need to engage the citizens more in the process to make it their place and in that way increase the usage. I sent out a questionnaire to all the organisations within the city to understand what was lacking in our public spaces and how the people wanted to develop them further.The answers from the community then turned into my proposition of the public square and parks of my hometown, Örnsköldsvik. In my proposition there are two main quotes from Eric Klinenberg’s book, Palaces for the people, that have been the core of my design‚“It is the interaction between people that creates society and the socially sustainable public urban space”. And the second one;“ Spending time in a market-driven, social setting, even a relatively       inexpensive fast-food restaurant or pastry shop requires paying forthe privilege”  I want to create a place where everyone can interact, no matter age, gender, ethnicity or social background.  In my design I’ve worked with flexibility and that the user is deciding in what way they want to use the space, depending on the time of the day, season of the year and amount of people in the group. One of my inventions is the material storage that enables a spontaneous activity in the city centre. A place where you can find the material for different activities, depending on your interest. It has the same design as the bus stop that we can see in this picture, with a 35 degree roof to make the best use of the pv panels on the roof. This energy source enables the possibility to charge your phone while waiting for the bus or during an activity. It is time for the citizens to connect in our commons.
59

Vocabulary Strategies in an Elementary Classroom in a Third World Country

Johnson, Laurie 01 January 2015 (has links)
Second and 3rd grade Honduran students in a Christian school are not performing at grade level in vocabulary. Students who lag in vocabulary development may not comprehend what they read and are likely to perform poorly in their course work, which may result in repeating the grade. As a result of the students' poor performance, the school implemented vocabulary squares strategy instruction to improve vocabulary development. Guided by the theory of constructivism, the purpose of this casual comparative study was to determine if vocabulary squares strategy instruction resulted in greater word mastery for 2nd and 3rd grade Honduran students than did traditional vocabulary instruction. The control group (n = 16) received traditional vocabulary instruction, and the experimental group (n = 15) received vocabulary squares instruction for a period of 6 weeks. Analysis of gain score differences via an independent t test revealed no significant difference word mastery. The length of time the strategy instruction was implemented may have been insufficient to affect word mastery. It is recommended that teachers employ the vocabulary squares strategy more frequently and over a longer period of time to determine if vocabulary squares strategy instruction results in greater word mastery than traditional instruction. This practice may contribute to positive social change by increasing vocabulary development, which , in turn, affects students' comprehension and course work performance reducing -the number of Honduran students repeating 2nd or 3rd grade.
60

The Monuments of Imperial London: Trafalgar Square, the Mall, and the British Empire

Stebbins, Sean January 2023 (has links)
Thesis advisor: Penelope Ismay / Monumental projects British social imperialists inaugurated at both Trafalgar Square and the Mall seem like the most obvious examples of imperial arrogance, examining the processes through which they were envisioned, planned, and realized reveals a deep insecurity, both about who Britons were as a people, and ultimately, where they stood in the world as a nation. It is exceedingly difficult to identify a specific, overarching vision from any one British official for either project’s realization precisely because there were so many competing interpretations of how social imperialists should monumentalize—not to mention the competing individuals themselves. Though this insecurity is probably not unique to Britain, I believe the ideological emptiness it betrays is unique to modern empire. / Thesis (BA) — Boston College, 2023. / Submitted to: Boston College. College of Arts and Sciences. / Discipline: Scholar of the College. / Discipline: History.

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