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Placing observational limits on cosmic strings would provide important confirmation of or constraints on early universe models. Cosmic strings imprint the cosmic microwave background (CMB) with a distinct position space signature, leaving line discontinuities in the temperature maps due to a combination of gravitational lensing and the Doppler effect. To improve theoretical observational constraints, I wrote sky map simulations with and without cosmic strings, edge detection and counting algorithms, and programs to differentiate statistically between the ambient edges due to the inflationary background and the string signals. Our application of position space algorithms, specifically the Canny edge detection algorithm, was highly successful and allowed us to establish improved limits, by more than an order of magnitude, on the contribution of cosmic strings to the total fluctuation spectrum from simulated data. We extended our analysis of the Canny algorithm to distinguish between abelian cosmic strings and cosmic superstrings through the presence of three-string junctions in cosmic superstring maps. To this end, I wrote the first simulations of maps with junctions and found a disparity in the density of edges in maps of string networks with and without junctions. This work resulted in a statistic to differentiate between different cosmic string models including string theory models and models with different numbers of cosmic strings. I also modeled the position space polarization signal induced by cosmic string wakes. Due to the gravity of a moving string, matter falls into overdense two dimensional sheets of matter, wakes, behind the string. As photons propagate through the wakes, they encounter this overdensity of ionized matter which can polarize them. In our work we placed the first limits on the CMB polarization signature of cosmic strings including their signature non-linear structures, wakes, and found they would produce an observable signal when used in combination with an algorithm such as the Canny algorithm. The cosmic string wakes lead to a gradient in the intensity of polarization in the shape of the wake, greater at earlier positions of the string. The overdense wakes produced by strings provide more opportunity for the 21 cm hydrogen spin flip as well, so we found that cosmic strings wakes can be observed as three dimensional wedges in maps of 21 cm radiation absorption. Our paper is among the first to study the cosmic string signature in 21 cm and the first to examine the influence of wakes on the 21 cm signal. / La mise en place de limites d'observation sur les cordes cosmiques permettraient de confirmer, ou a tout le moins de contraindre de facon importante, les presents modeles de l'Univers primordial. Les cordes cosmiques impregnent le fond diffus cosmologique (ou CMB) d'une signature distincte dans l'espace, sous forme de discontinuites lineiques dans les cartes de temperatures. Ces dernieres sont dues a une combinaison des effets de lentilles gravitationnelles et de l'effet Doppler. Afin d'ameliorer les contraintes observationnelles theoriques, j'ai ecris des simulations de cartes du ciel avec et sans cordes cosmiques, des algorithmes de detection et de comptages des lignes de discontinuite, ainsi que des programmes permettant de distinguer de facon statistique les lignes de discontinuite produites naturellement dans le contexte de l'inflation cosmique de celles dues a la presence de cordes cosmiques. L'application d'algorithmes dans le domaine spatial (par opposition au domaine des harmoniques spheriques), en particulier l'application de l'algorithme de detection de discontinuites lineiques Canny, fut tres reussie et nous a permis d'etablir des limites ameliorees de plus d'un ordre de grandeur sur la contribution des cordes cosmiques a l'ensemble du spectre de fluctuations pour les donnees simulees. Nous avons etendu notre analyse utilisant l'algorithme Canny pour nous permettre de distinguer les cordes cosmiques abeliennes des supercordes cosmiques en analysant la presence de jonctions de trois cordes dans les cartes de supercordes cosmiques. A cette fin, j'ai ecris les premieres simulations de cartes incorporant ces jonctions et ai constate une disparite dans la densite de lignes de discontinuite detectee dans les cartes de reseaux de cordes avec et sans jonctions. Ce travail m'a permis d'elaborer un modele statistique permettant de differencier les differents modeles de cordes cosmiques, y compris les modeles provenant de la theorie des cordes et les modeles avec differents nombres de cordes cosmiques. J'ai aussi modelise, dans le domaine spatial, le signal de polarisation induit par les sillages de cordes cosmiques. En raison de la geometrie specifique de son champs gravitationnel, une corde cosmique en mouvement cause l'accretion de matiere dans des regions de sur densite bidimentionnelles, ou sillages, derriere elle. Lorsque des photons se propagent a travers ces sillages, ils peuvent etre polarises par leur rencontre avec la region de surdensite de matiere ionisee qui s'ytrouve. Par notre travail, nous avons impose les premieres limites sur la signature possible laissee dans le champs depolarisation du CMB, en incluant les effets de leur structures non-lineaires, c'est-a-dire de leurs sillons, et trouve que ces dernieres produiraient un signal detectable lorsqu'utilisees de concert avec un algorithme tel quel'algorithme Canny. Les sillages d'une corde cosmique donnent naissance a un gradient d'intensite dans le spectre de polarisation present dans la structure des sillages, la polarisation etant plus importante aux points les plus recules dans l'histoire du deplacement de la corde. Les zones de surdensite produites par les sillages des cordes donnent egalement lieu a une gamme d'opportunites concernant la raie d'emission a 21 cm de l'hydrogene. Ainsi, nous avons decouvert que les sillages de cordes pourraient etre observe sous la forme de prismes triangulaires tridimensionnels dans les cartes d'absorption de la raie a 21 cm. Notre article est parmis les premiers a etudier la signature des cordes cosmiques dans le spectre d'absorption de la raie a 21 cm, et est le premier a examiner l'influence possible des sillages sur ce dernier.

Self-assembled quantum dots have attracted recent interest because of their broad potential applications to quantum information processing and fundamental research. While such structures present many obstacles to standard electronic characterization, recent experimental and theoretical work has demonstrated the use of a capacitively coupled AFM cantilever as a sensitive probe of quantum dot charge dynamics. The work in this thesis extends previous theoretical results to explore the case of an AFM tip coupled to a double quantum dot. Compared to single dot results, the DQD system involves significant new physical phenomena. In addition to fluctuations in the total charge, the double dot system can respond to the cantilever through changes in the distribution of a single electron. In particular, new features arise due to coherent interdot tunneling. After presenting the theoretical approach to this problem, we will discuss the results in the context of current experimental efforts using InAs dots. These effects should be accessible in a wide variety of experimental regimes. / Grâce à plusieurs applications prometteuses---en particulier dans le champ de l'informatique quantique---les points quantiques (PQ) auto-assemblées ont récemment merité beaucoup d'attention. Tandis que tels structures presentent des obstacles aux méthodes traditionnelles de characterization, des nouveaux avancements théoriques et expérimentals démontrent l'utilization d'un oscillateur d'une microscope à force atomique (AFM) pour characterizer la dynamique des electrons dans l'échantillon. Cette technique profite du fait que la force électrostatique entre l'AFM et le PQ dépend de la charge, qui change selon la position de l'oscillateur. Le résultat est une force variable qui produit des changements dans la fréquence résonante et la dissipation méchanique de l'oscillateur. Dans cette thèse, une exploration theorique considère le cas où l'oscillateur interagit avec deux points quantiques à la fois. En plus de la charge totale du système, il faut maintenant considérer sa distribution entre les deux points quantiques. Cette distribution, qui peut changer par l'entremise des effets tunnels et cohérents et incohérents, répond à la motion de l'oscillateur, produisant des effets dynamics qui devraient être mesurables dans une large étendue des régimes expérimentals.

Typescript. / Thesis (Ph. D.)--University of Hawaii, 1970. / Bibliography: leaves 197-203. / vi, 203 l

<p>In this thesis only Binary codes are studied. Firstly, the codes overs the field GF(2) by the adjacency matrix of the complement T(n), ofthe triangular graph, are examined. It is shown that the code obtained is the full space F2 s(n/2) when n= 0 (mod 4) and the dual code of the space generated by the j-vector when n= 2(mod 4). The codes from the other two cases are less trivial: when n=1 (mod 4) the code is [(n 2), (n 2 ) - n + 1, 3] code, and when n = 3 (mod 4) it is an [(n 2), (n 2) - n, 4 ] code.</p>

The cultures and stories of peripheral populations and conquered peoples, which have largely been drowned out by the accepted discourse of the nation states that colonised them, have begun to be recouped and re-told.The subaltern school of post-colonial theory provides the writer of fiction with a range of theories from which to devise the means of voicing the unvoiced. Among these, Ranajit Guha’s work on the prose of counter-insurgency provides the author with the key to finding lost voices, in particular those of the vanquished peasant rebel. “A Christmas Game” is a fictional account of the 1549 Prayer Book Rebellion, in which the commons of Cornwall and Devon rebelled against the abolition of the mass and the introduction of the English language prayer book. By analysing the language and detail contained in the substantial historical record, identifying that which is missing, and examining sources that detail the religious, cultural and “folk” elements of daily life, it is possible to see this event and re-tell it through the eyes of those characters whose stories have never been told and thereby create a new place from which to further debate and research.

Thesis (PhD)--University of South Australia, 1996.

A fundamental error has dominated philosophy and science since ancient times, the assumption of the existence of the "unicorn-world"-that is, the existence of one unique world. It is one of the oldest and most dominant paradigms in human thinking that has generated many pseudo-problems in philosophy and science. We can identify this thinking paradigm, the unicorn-world, in the majority of myths, theological doctrines, philosophical approaches and scientific theories. In order to avoid this error, in Part I of this thesis, I show that it is necessary to replace the unicorn-world (in which all entities, such as Gods, minds, bodies, planets, tables and micro-particles have been placed all together) with "epistemologically different worlds" (which presuppose that each class of entities forms an epistemological different world). More than three centuries ago, Descartes was aware of the impossibility of solving an "anomaly" (the mind-body problem) but did not realize that the cause of this "mystery" is the unicorn-world. The role of Kantian a priori constitutive elements (categories and pure intuitions) is extended to the epistemologically constitutive interactions among classes of epistemologically different entities that belong to epistemologically different worlds. The consequence of the existence of epistemologically different worlds is that the famous mind-body problem is a false problem or a pseudo-problem. In Part II, from the "epistemologically different worlds" perspective, I analyze notions from: (1) The philosophy of mind and cognitive science (the mind-body problem, emergence and reduction, mental causation and supervenience, levels, etc.) (2) The philosophy of science (Carnap's linguistic frameworks, Quine's and Goodman's relativity, Friedman's relative constitutive a priori principles) and the science of the twentieth century (the relationship between Einstein's theory of relatiVity and quantum mechanics, complementarity and superposition, entanglement, nonlocality and nonseparability from quantum mechanics).

v, 149 leaves ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Pure Mathematics, 1979

Typescript (photocopy) / 97 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.) Dept. of Pure Mathematics, University of Adelaide, 1983