Thesis (M.S.)--Oregon State University, 2006. / Printout. Includes bibliographical references (leaves 27-31). Also available on the World Wide Web.

Bromine compounds play an important role as catalyst of the ozone destruction in both the stratosphere and troposphere. While the impact of bromine species on the chemistry of the stratosphere is known to a large extend, a number of uncertainties remain regarding the sources and sinks of atmospheric bromine as well as the chemistry and impact of bromine species on the troposphere. <p>This work describes remote-sensing observations of bromine monoxide (BrO) derived from scattered sunlight spectra in the ultraviolet region measured by ground-based multi-axis and satellite nadir viewing instruments (GOME and GOME-2). The method of differential optical absorption spectroscopy is used to retrieve the columnar concentration of BrO along the effective light path through the atmosphere. New algorithms to derive vertical columns of BrO resolved into their stratospheric and tropospheric contributions are developed and described. For the ground-based geometry a way was found to determine independently the stratospheric and tropospheric BrO columns from the diurnal variation of the BrO measurements. For the satellite observations, the contribution of the stratospheric BrO to the measured column is estimated using an innovative stratospheric BrO climatology. This climatology is based on a state-of-the-art stratospheric chemical transport model, and explicitly accounts for the impact of atmospheric dynamics and photochemistry on the stratospheric BrO distribution. As for the tropospheric fraction of the measured total BrO column, it is derived using a residual technique accounting for the effects of clouds and surface reflectivity. <p>Supported by an extensive set of correlative data, the results presented here allow to study properly the spatial and temporal evolution of atmospheric BrO at the global scale and enable to better assess the significance of BrO in the polar planetary boundary layer and free-troposphere as well as the contribution from very short-lived brominated sources gases to the stratospheric bromine budget. We also report on the first satellite detection of BrO in a volcanic plume, using GOME-2 measurements.<p><p><p><p>Les composés bromés jouent un rôle important dans la stratosphère et la troposphère en tant que catalyseurs de la destruction d’ozone. Bien que l’impact des espèces bromées sur la chimie de la stratosphère soit largement compris, il reste de nombreuses incertitudes en ce qui concerne les sources et les pertes de brome dans l’atmosphère ainsi qu’à propos de la chimie et de l’impact des espèces bromées sur la troposphère.<p>Le travail présenté dans ce manuscrit porte sur la télédétection du monoxyde de brome (BrO) à partir de spectres du rayonnement solaire diffusé, mesurés dans l’ultraviolet à partir d’instruments au sol de type multi-axis et satellitaires à visée nadir (GOME et GOME-2). La méthode de spectroscopie d’absorption optique différentielle est utilisée pour inverser la colonne intégrée de BrO le long du chemin optique effectif dans l’atmosphère. Nous avons développé de nouveaux algorithmes afin de dériver les colonnes verticales de BrO résolues en leurs contributions stratosphérique et troposphérique. Pour la géométrie d’observation au sol, un moyen a été trouvé pour déterminer indépendamment les colonnes de BrO stratosphérique et troposphérique, et cela à partir de la variation diurne des mesures de BrO. Pour les observations satellitaires, la contribution de la stratosphère à la colonne mesurée de BrO est estimée à partir d’une climatologie innovante de BrO stratosphérique. Cette climatologie est basée sur un modèle de pointe de la chimie et du transport de la stratosphère; par ailleurs, elle tient compte explicitement de l’impact de la dynamique atmosphérique et de la photochimie sur la distribution du BrO dans la stratosphère. La fraction troposphérique de la colonne totale mesurée de BrO est quant à elle dérivée à partir d’une technique résiduelle tenant compte des effets des nuages et de la réflectivité de la surface. <p>Soutenus par un vaste jeu de données corrélatives, les résultats présentés dans ce travail permettent d’étudier de manière appropriée l’évolution spatiale et temporelle du BrO atmosphérique à l’échelle globale. Ces résultats permettent également de mieux estimer l’importance du BrO dans la couche limite planétaire polaire et dans la troposphère libre ainsi que la contribution des précurseurs bromés à temps de vie court sur le budget de brome dans la stratosphère. Nous présentons également la première détection satellitaire de BrO dans un panache volcanique, à l’aide de mesures effectuées avec l’instrument GOME-2. <p> / Doctorat en Sciences de l'ingénieur / info:eu-repo/semantics/nonPublished

Doctor of Philosophy / Department of Agronomy / J. Anita Dille / Integrated weed management (IWM) is an ecological approach to weed control that reduces dependence on herbicides through understanding of weed biology and involves using multiple weed control measures including cultural, chemical, mechanical and biological methods. The critical period of weed control is the duration of the crop life cycle in which it must be kept weed-free to prevent yield loss from weed interference. Eight experiments were conducted throughout Kansas between October 2010 and June 2012 to identify this period in winter wheat grown under dryland and irrigated conditions. Impact of henbit and downy brome density on winter wheat yields were evaluated on four farmer’s fields with natural populations and on a research station with overseeded populations. Henbit density up to 156 plants m-2 did not affect winter wheat yield, while downy brome at a density of 40 plants m-2 reduced yield by 33 and 13% in 2011 and 2012, respectively. In the presence of downy brome, winter wheat should be kept weed-free approximately 30 to 45 days after planting to prevent yield loss; otherwise, weeds need to be removed immediately following release from winter dormancy to prevent yield loss due to existing weed populations. Flumioxazin and pyroxasulfone are herbicides registered for use in winter wheat, soybean and corn for control of broadleaf and grass weeds. Flumioxazin and pyroxasulfone were evaluated for plant response to localized herbicide exposure to roots, shoots, or both roots and shoots utilizing a novel technique. Two weed species, ivyleaf morningglory and shattercane, as well as two crops, wheat and soybean, were evaluated for injury after localized exposures. The location and expression of symptoms from the flumioxazin and pyroxasulfone herbicides were determined to be the shoot of seedling plants. The utilization of preemergence herbicides in winter wheat is not a common practice, although application may protect winter wheat from early season yield losses as determined by the critical weed-free period. Kansas wheat growers should evaluate the presence and density of weed species to determine which weed management strategy is most advantageous to preserving winter wheat yield.

Conventional production of meat products from ruminant animals in the United States requires inputs including the cultivation and nitrogen fertilization of annual grains such as corn and barley, and transportation of cattle and grain to feedlots. Consumers have concerns about the impact of feedlot conditions on animal health, and about the implications of pharmaceutical inputs such as growth hormones and antibiotics on the environment and human health. These concerns have led to a growing interest in pasturefinished meat production by consumers. Such smaller-scale livestock production systems can be healthier and lower-stress for animals, are integrated into local food systems and are more transparent to consumers, and have higher potential profitability for producers than traditional ruminant production methods. There is a strong market for pasture-finished beef products, and prices for naturally or organically raised beef have remained well above feedlot-produced product prices. There is also concern about the impact of ruminant production on the environment, including air and water pollution from feedlot production and greenhouse gasses that are emitted from ruminant animals during feed digestion. This thesis project explored the potential of a beef production system based on perennial legumes, including the non-bloating legume birdsfoot trefoil (BFT; Lotus corniculatus L.) for producing meat products from cattle while reducing concentrate feeding and methane production. The condensed tannins that are produced by BFT bind proteins in the rumen but allow them to be digested in the abomasum and intestines, which in turn leads to better utilization of forage nutrients during the finishing period and higher gains or milk production. The higher digestibility of legumes compared with grasses reduces methane emissions in cattle both through higher digestibility of the forage and through direct impacts on methanogens operating in the rumen. As reported in this thesis, steers finished on BFT gained significantly more weight per day than steers fed another perennial forage legume, cicer milkvetch, but did not gain as rapidly as feedlot-fed steers. At the end of summer grazing, the blood plasma of pasture-fed steers was lower in saturated and omega-6 fatty acids and higher in transvaccenic and omega-3 fatty acids than the blood plasma of feedlot-fed steers. When beef cows grazed grass and legume pastures, enteric methane emissions were lower on the legume pastures than the grass pasture. These results demonstrate that, compared with other feed sources, perennial legume pastures used for cattle production can improve cattle gains and reduce environmental impacts.

Graduation date: 2004

This dissertation examines beggars, gypsies, rogues, and vagrants presented in early modern English drama, with the discussion of how these peripatetic characters represent the discourses of vagrancy of the period. The first chapter introduces Tudor and early Stuart governments' legislation and proclamations on vagabondage and discusses these governmental policies in their social and economic contexts. The chapter also deals with the literature of roguery to point out that the literature (especially in the Elizabethan era) disseminated such a negative image of beggars as impostors and established the antagonistic atmosphere against the wandering poor. The second chapter explores the anti-theatrical aspect of the discourses of vagrancy. Along with the discussion of early playing companies' traveling convention, this chapter investigates how the long-held association of players with beggars is addressed in the plays that are dated from the early 1570s to the closing of the playhouses in 1642. In the third chapter I read Shakespeare's King Lear with the focus on its critical allusions to the discourses of vagrancy and interpret King Lear's symbolic experience of vagrancy in that context. The chapter demonstrates that King Lear represents the spatial politics embedded in the discourses of vagrancy and evokes a sympathetic understanding of the wandering poor. Chapter IV focuses on Beggars' Bush and analyzes the beggars' utopian community in the play. By juxtaposing the play with a variety of documents relating to the vagrancy issue in the early seventeen century, I contend that Beggars' Bush reflects the cultural aspirations for colonial enterprises in the early Stuart age. Chapter V examines John Taylor's conceptualization of vagrancy as a trope of travel and free mobility, and discusses the "wanderlust" represented in A Jovial Crew: Merry Beggars as an exemplary anecdote showing the mid seventeenth century's perceptions on vagrancy and spatial mobility. Thus, by exploring diverse associations and investments regarding vagrants, this study demonstrates that the early modern discourses of vagrancy have been informed and inflected by shifting economic, socio-historical, and national interests and demands.

Bromine compounds play an important role as catalyst of the ozone destruction in both the stratosphere and troposphere. While the impact of bromine species on the chemistry of the stratosphere is known to a large extend, a number of uncertainties remain regarding the sources and sinks of atmospheric bromine as well as the chemistry and impact of bromine species on the troposphere. This work describes remote-sensing observations of bromine monoxide (BrO) derived from scattered sunlight spectra in the ultraviolet region measured by ground-based multi-axis and satellite nadir viewing instruments (GOME and GOME-2). The method of differential optical absorption spectroscopy is used to retrieve the columnar concentration of BrO along the effective light path through the atmosphere. New algorithms to derive vertical columns of BrO resolved into their stratospheric and tropospheric contributions are developed and described. For the ground-based geometry a way was found to determine independently the stratospheric and tropospheric BrO columns from the diurnal variation of the BrO measurements. For the satellite observations, the contribution of the stratospheric BrO to the measured column is estimated using an innovative stratospheric BrO climatology. This climatology is based on a state-of-the-art stratospheric chemical transport model, and explicitly accounts for the impact of atmospheric dynamics and photochemistry on the stratospheric BrO distribution. As for the tropospheric fraction of the measured total BrO column, it is derived using a residual technique accounting for the effects of clouds and surface reflectivity. Supported by an extensive set of correlative data, the results presented here allow to study properly the spatial and temporal evolution of atmospheric BrO at the global scale and enable to better assess the significance of BrO in the polar planetary boundary layer and free-troposphere as well as the contribution from very short-lived brominated sources gases to the stratospheric bromine budget. We also report on the first satellite detection of BrO in a volcanic plume, using GOME-2 measurements. Les composés bromés jouent un rôle important dans la stratosphère et la troposphère en tant que catalyseurs de la destruction d’ozone. Bien que l’impact des espèces bromées sur la chimie de la stratosphère soit largement compris, il reste de nombreuses incertitudes en ce qui concerne les sources et les pertes de brome dans l’atmosphère ainsi qu’à propos de la chimie et de l’impact des espèces bromées sur la troposphère. Le travail présenté dans ce manuscrit porte sur la télédétection du monoxyde de brome (BrO) à partir de spectres du rayonnement solaire diffusé, mesurés dans l’ultraviolet à partir d’instruments au sol de type multi-axis et satellitaires à visée nadir (GOME et GOME-2). La méthode de spectroscopie d’absorption optique différentielle est utilisée pour inverser la colonne intégrée de BrO le long du chemin optique effectif dans l’atmosphère. Nous avons développé de nouveaux algorithmes afin de dériver les colonnes verticales de BrO résolues en leurs contributions stratosphérique et troposphérique. Pour la géométrie d’observation au sol, un moyen a été trouvé pour déterminer indépendamment les colonnes de BrO stratosphérique et troposphérique, et cela à partir de la variation diurne des mesures de BrO. Pour les observations satellitaires, la contribution de la stratosphère à la colonne mesurée de BrO est estimée à partir d’une climatologie innovante de BrO stratosphérique. Cette climatologie est basée sur un modèle de pointe de la chimie et du transport de la stratosphère; par ailleurs, elle tient compte explicitement de l’impact de la dynamique atmosphérique et de la photochimie sur la distribution du BrO dans la stratosphère. La fraction troposphérique de la colonne totale mesurée de BrO est quant à elle dérivée à partir d’une technique résiduelle tenant compte des effets des nuages et de la réflectivité de la surface. Soutenus par un vaste jeu de données corrélatives, les résultats présentés dans ce travail permettent d’étudier de manière appropriée l’évolution spatiale et temporelle du BrO atmosphérique à l’échelle globale. Ces résultats permettent également de mieux estimer l’importance du BrO dans la couche limite planétaire polaire et dans la troposphère libre ainsi que la contribution des précurseurs bromés à temps de vie court sur le budget de brome dans la stratosphère. Nous présentons également la première détection satellitaire de BrO dans un panache volcanique, à l’aide de mesures effectuées avec l’instrument GOME-2.

Glasshouse and growth-chamber experiments were conducted to evaluate primisulfuron phytotoxicity and the influence of adjuvants on downy brome and Kentucky bluegrass. GR₅₀ (50% growth reduction) values were 0.97 ± 0.57 and 8.07 ± 1.85 g/ha for downy brome and Kentucky bluegrass, respectively. Primisulfuron was applied to downy brome and Kentucky bluegrass at 3 placement sites; foliar, soil, and foliar plus soil. Foliar or foliar plus soil applications were more effective at reducing downy brome dry weights than the soil application of primisulfuron, while Kentucky bluegrass was injured more from the soil or foliar plus soil applications than from the foliar application of primisulfuron. Primisulfuron at 5 g/ha applied alone reduced downy brome dry weights by 5%, whereas, when an adjuvant was added, dry weights were reduced by 52 to 83%. Primisulfuron was more phytotoxic to downy brome at alternating temperatures of 8-16 C and 16-24 C than at 0-8 C. Phytotoxicity of primisulfuron was less when downy brome plants were stressed for soil moisture after herbicide treatments than when the plants were not stressed or only stressed before treatment. / Graduation date: 1999

Le concept d'image est présent dans la littérature depuis qu'il est associé à une meilleure compréhension du comportement touristique ainsi qu'au choix d'une destination. Bien qu'une attention significative ait été portée sur l'image d'une destination dans le domaine du tourisme, peu de chercheurs se sont attardés à l'image d'une destination dans un contexte de tourisme rural. Ce mémoire a donc comme objectif de mesurer l'image perçue d'un produit agrotouristique situé en milieu rural, de découvrir les différents facteurs qui forment et influencent l'image de ce produit en tant que destination touristique et de mesurer la satisfaction des clients actuel en fonction de celle-ci ainsi que leur intention de retourner la visiter. Plus spécifiquement, cette étude s'intéresse à l'image de la Route des vins de Brome-Missisquoi, située dans la région touristique des Cantons-de-l'Est. Cette image perçue est celle des clients actuels de la Route des vins. Elle a été captée lors d'une enquête réalisée auprès de 469 clients suite à la visite de la destination. En combinant deux méthodes de mesure, structurée et non structuré (questions fermées et ouverte), il a été possible de mesurer l'image globale de la Route des vins et de découvrir les facteurs qui sont en lien et qui influencent l'image cognitive et l'image affective. Il a également été possible de réaliser quelles facettes de l'image étaient le plus corrélées avec la satisfaction et leur impact sur l'intention qu'ont les visiteurs de retourner visiter la destination. Les résultats de cette étude permettent de conclure que l'image est un facteur clé dans le marketing touristique. Ils démontrent que les visiteurs de la Route ont une image positive et sont globalement satisfaits de leur expérience. Aussi, certaines sources d'information promotionnelles et les groupes de références ainsi que les motivations, l'âge, la scolarité, le nombre de visite précédente, les habitudes et connaissances en matière de vin sont reliés à la perception de l'image. Les résultats démontrent également la présence de relations positives entre la perception de l'image, la satisfaction et l'intention de retourner visiter la destination. ______________________________________________________________________________ MOTS-CLÉS DE L’AUTEUR : images, destinations touristiques, perceptions, région rurale, Route des vins

This dissertation examines beggars, gypsies, rogues, and vagrants presented in early modern English drama, with the discussion of how these peripatetic characters represent the discourses of vagrancy of the period. The first chapter introduces Tudor and early Stuart governments' legislation and proclamations on vagabondage and discusses these governmental policies in their social and economic contexts. The chapter also deals with the literature of roguery to point out that the literature (especially in the Elizabethan era) disseminated such a negative image of beggars as impostors and established the antagonistic atmosphere against the wandering poor. The second chapter explores the anti-theatrical aspect of the discourses of vagrancy. Along with the discussion of early playing companies' traveling convention, this chapter investigates how the long-held association of players with beggars is addressed in the plays that are dated from the early 1570s to the closing of the playhouses in 1642. In the third chapter I read Shakespeare's King Lear with the focus on its critical allusions to the discourses of vagrancy and interpret King Lear's symbolic experience of vagrancy in that context. The chapter demonstrates that King Lear represents the spatial politics embedded in the discourses of vagrancy and evokes a sympathetic understanding of the wandering poor. Chapter IV focuses on Beggars' Bush and analyzes the beggars' utopian community in the play. By juxtaposing the play with a variety of documents relating to the vagrancy issue in the early seventeen century, I contend that Beggars' Bush reflects the cultural aspirations for colonial enterprises in the early Stuart age. Chapter V examines John Taylor's conceptualization of vagrancy as a trope of travel and free mobility, and discusses the "wanderlust" represented in A Jovial Crew: Merry Beggars as an exemplary anecdote showing the mid seventeenth century's perceptions on vagrancy and spatial mobility. Thus, by exploring diverse associations and investments regarding vagrants, this study demonstrates that the early modern discourses of vagrancy have been informed and inflected by shifting economic, socio-historical, and national interests and demands.