Thesis (M.A.)--Georgia State University, 2006. / Title from title screen. Andrew Altman, committee chair; Peter Lindsay, Dr George Rainbolt, committee members. Electronic text (70 p.) : digital, PDF file. Description based on contents viewed May 7, 2007. Includes bibliographical references (p. 69-70).

No description available.

Indiana University-Purdue University Indianapolis (IUPUI) / With the goal of determining ice sheet history in the central Ross Sea since the late Miocene, the provenance of glacial till from IODP expedition 374 site U1522 was assessed using a suite of three analyses. A total of 3,869 zircons, between 250-63 microns in size, from sixteen different cores were measured for U-Pb isotopes via LA-ICP-MS. Zircon data was compared to neodymium isotope and clast lithology datasets from collaborators. Site U1522 shows three distinct provenance shifts from the late Miocene to the Pleistocene, two of which are coincident with Ross Sea Unconformities three and two. Late Miocene samples have abundant Cretaceous zircon populations, radiogenic neodymium values, and clasts interpreted as having a West Antarctic provenance. In latest Miocene samples, zircons are mostly Ross Orogeny age (c. 470 615 Ma) and Cretaceous zircon grains are almost absent, neodymium values are relatively un radiogenic, and dolerite clasts are present signaling a shift to East Antarctic derived ice. Above Ross Sea Unconformity 3, early to mid Pliocene samples show a shift back to West Antarctic provenance with abundant Cretaceous zircons and more radiogenic neodymium values. Late Pliocene to Pleistocene samples, deposited above Ross Sea Unconformity 2, reflect dominant East Antarctic provenance with few Cretaceous zircon dates, relatively un radiogenic neodymium values, and the presence of dolerite clasts. These data are broadly in agreement with ice sheet interpretations suggested by clast analysis from ANDRILL site AND-1B. Permo-Triassic zircon dates suggest the presence of unexposed bedrock of this age beneath the West Antarctic Ice Sheet based on their association with Cretaceous dates that have not been reported from East Antarctica. The zircon dataset also reveals two late Miocene intervals with a previously undocumented Eocene Oligocene magmatic event ~30 40 Ma. The coexistence of Cretaceous dates in these intervals suggests a likely West Antarctic source. The absence of Eocene Oligocene zircons in subsequent Plio Pleistocene sediments may be explained by substantial erosion and offshore deposition of the West Antarctic interior, including volcanic edifices following the Middle Miocene Climatic Transition.

172 Patienten, welche von 06/17 bis 01/18 am Uniklinikum Würzburg entsprechend der Ross-Prozedur operiert wurden, wurden nachuntersucht (Follow Up: 6,2 ± 4,5 Jahre). Ziel war es den Einfluss der Operationstechniken - Subkoronar (SK)- und Wurzelersatztechnik (WE) zu untersuchen sowie den Einfluss der Spenderklappen - Homograft (HG) und Matrixprothese (M). Die Überlebensrate betrug in der SK- und WE-Gruppe jew. 98,1 %. Die Reoperationsrate lag bei 6,8 % (SK) und 3,9 % (WE). Bezüglich der postop. Hämodynamik wurden Normwerte ermittelt (SK und WE). NYHA Stadium I lag bei 74,1 % (SK) und 95,5 % (WE) vor. Bzgl. Überlebensrate (HG: 98,1 %; M: 95,4 %) sowie Reop.rationsrate (HG: 0 %; M: 33 %), postop. hämodyn. Werten und postop. klinischem Verlauf (NYHA Stadium I: 80 % der HG Gruppe, 50 % der M-Gruppe) schnitt die M-Gruppe schlechter ab. / There was a follow up of 172 patients which were operated according to the ross-procedure from 06/17 to 01/18. The aim of the study was to analyze the impact of the surgical techniques - subcoronar (SC)- and the root replacement (RR) technique - and the impact of the donor flaps - homograft (hg) and matrixprothesis (m). The survival rate was 98,1 % (SC and RR). The reoperation rate was 6,8 % (SC) and 3,9 % (RR) and there were normal values for the postop. hemodynamics. 74,1 % (SC) and 95,5 % (RR) were in NYHA Class I. With reference to the survival rate (hg: 98,1 %; m: 95,4 %) as well as to the postop. hemodynamics and NYHA Class (hg: 80 %, m: 50 % Class I) the results for m-group were worse.

Thesis (Ph. D.)--Université de Montréal, 2001. / Includes bibliographical references.

Thesis (Ph. D.)--Florida State University, 2004. / Advisor: Dr. Eric Walker, Florida State University, College of Arts and Sciences, Department of English. Title and description from dissertation home page (viewed June 17, 2004). Includes bibliographical references.

This study investigated the work of design theorist Denman Waldo Ross and his theory of “pure design.” During the early twentieth century, Ross delivered lectures, published articles and books, and mused endlessly on the subject of art and design pedagogy. He taught future architects, designers, and art teachers at Harvard University, and acted as a patron to artists and art theorists. He also served on numerous boards and panels, helping to govern the Boston public schools, the Museum of Fine Arts, Boston, and the Academy of Arts and Sciences, among others. His work is not widely known today, but it was influential during a critical moment in American art education history. Arthur Wesley Dow is often credited as initiator of the elements and principles of design—an unfair burden for him to bear. Denman Waldo Ross, too, participated in the development of the language and terminology related to the elements and principles of design in the canon of art education at the turn of the twentieth century. / text

Texte remanié de: Diss.--Literaturwissenschaft--Gesamthochschule Wuppertal, 1978. / Bibliogr. 225-238. Index.

Basal melting of ice shelves is causing accelerating mass loss from the Antarctic Ice Sheet, yet the oceanographic processes which drive this are rarely observed. This thesis uses new observations from phase sensitive radar and moored oceanographic instruments to describe the processes which drive rapid basal melting of the north-western Ross Ice Shelf. Oceanographic conditions at the mooring site are strongly influenced by the neighbouring Ross Sea Polynya. High Salinity Shelf Water fills the lower water column continuously, but during summer a southward flow ventilates the cavity bringing Antarctic Surface Water (AASW) to the site. Tides account for half of the flow speed variance, and low frequency variability is influenced by local winds, and eddies associated with sea ice production in the polynya. Four years of basal melt rate observations show a mean melt rate of 1.8 m y$^{-1}$ at the mooring site and a strong seasonal cycle driven principally by water temperature variations. Radar observations show that melt rates vary rapidly and continuously in response to flow speed variability, and rapid melting occurs only when flow speeds are high. Radar observations of melt rates from 78 sites on the Ross and McMurdo ice shelves show an area-averaged annual-mean basal melt rate of 1.35 m y$^{-1}$, implying a net basal mass loss of 9.6 Gt y$^{-1}$ from the region. Melt rates are highest near the ice front where annual-mean and short-term summer rates reached 7.7 m y$^{-1}$ and 53 m y$^{-1}$, respectively. The seasonal and spatial variations in melt rate are consistent with melting driven by the summer inflow of AASW. Observations of boundary layer water temperature, flow speed and melt rates indicate that melt rates scale linearly with current speed, but sub-linearly with temperature in the outer boundary layer, possibly due to the stabilising effects of melt water input. Existing melt rate parameterisations which account for flow speed can be tuned to match the observations when thermal driving is low, but overestimate melt rates at higher temperatures, implying the need for further refinements to the models.

Dans cette thèse on s'intéresse a l'aspect spatial dans la modélisation en épidémiologie, ainsi que des conditions menant a la stabilité des systèmes que nous présentons, en épidémiologie, a partir des modèles classiques de Ross et Mckendrick. Dans un premier temps, nous examinons les effets de l'indice de la différence normalisée de végétation (NDVI) dans un modèle de contamination du paludisme a Bankoumana, une région du Mali. A partir du système obtenu, nous trouvons le taux de reproduction de base. Deux points d'équilibre sont déduits dont, un point d'équilibre sans maladie et un point d'équilibre endémique. Ce dernier point d'équilibre ainsi que le taux de reproduction de base sont fonction de l'indice de végétation normalisée. Par la suite, nous construisons un modèle ayant des équations a retard, dans lequel est également incorporée le NDVI. Le taux de reproduction de base ainsi que les deux points d'équilibre qui découlent de notre système sont fonction des retards introduits. Nous montrons que la stabilité de nos points d'équilibre est, non seulement fonction du taux de reproduction de base, mais elle est aussi étroitement liée aux retards introduits. Dans une autre optique, nous fractionnons la région d'étude en zones dans lesquelles nous émettons l'hypothèse que le taux de contagion induite par les individus d'une zone sur les individus de la même zone, ainsi que celui des individus d'une zone sur ceux d'une autre zone, peut être différents. Nous obtenons un système qui nous permet de déterminer les points d'équilibre ainsi que les conditions qui nous permettent d'obtenir la stabilité au sens de Lyapunov. Puis, nous perturbons le système précédent au niveau de son unique point d'équilibre endémique, en introduisant un bruit additif. Par suite, les conditions permettant la stabilité au sens de Lyapunov, sur le nouveau système obtenu, sont également déduites . Dans un cadre similaire, nous élaborons un modèle multi-groupes, dans lequel nous introduisons des coordonnées spatiales. Les groupes sont formés selon une proximité dépendant du rayon d'un cercle, de manière aléatoire. Ici, le taux de contagion est supposé uniforme dans les groupes. Après avoir déterminé les points d'équilibre ainsi que le taux de reproduction de base,nous trouvons les conditions qui favorisent la stabilité au sens de Lyapunov dans le cadre général. A l'ordre 1, c'est-a-dire, lorsqu'on suppose que nous n'avons qu'un groupe, les conditions de stabilité sont obtenus par le critère de Routh-Hurwitz. / In this thesis, our interest is on the aspect in space of the establishment of a spatial model in epidemiology and the conditions leading to the stability of the systems that we present, in epidemiology, from the classical models by Ross and Mckendrick. Firstly, we intend to examine the eects of the Normalized DiFerence Vegetation Index(NDVI) in a model of contamination of malaria in Bankoumana, a region in Mali. From the system obtained, we willnd the basic reproduction rate. Then we deduce two point of equilibrium, among which one point of equilibrium without the disease and another one with an endemic point. The latter with the basic reproduction rate vary according to the indices of normalized vegetation. Then, we will build a model having equations delay, containing the NDVI. The rate of basic reproduction and the two points of equilibrium that come from our system depend upon the delay introduced. We will show that the stability of our points of equilibrium is not only dependent upon the basic reproduction rate, but also closely related to the delays introduced. In another way, we will divide the region of study in areas where we will set hypotheses that the rate of contamination brought about by individuals in an area of study on the others, can be dierent. It will permit us to obtain a system in which we will determine the points of equilibrium and the conditions that will lead us to obtain the stability according to Lyapunov. Then, we will disturb the previous system at the level of its unique endemic point of equilibrium, with the introduction of an additional noise. The conditions leading to stability according to Lyapunov, on the new system obtained, are generally deduced here. In a similar framework, we will elaborate a multigroups model, in which we will introduce spatial coordinates. The groups are formed according to a closeness depending to a radius of a circle at random. Here, the rate of contamination is supposed to be uniform in the groups. After having determined the point of equilibrium and the rate of basic reproduction, we will nd the conditions facilitating stability in as by Lyapunov in a global framework. In the order1, it means that supposing that we have only one group, the conditions of stability are obtained according to the Routh-Hurvitz criteria.