La catalyse hétérogène influe sur la cinétique des réactions chimiques pour favoriser la formation de produits souhaités. Appliquée à la dépollution atmosphérique, elle permet de réduire considérablement l'émission de polluants. Son plus grand succès public est d'ailleurs sans conteste le pot catalytique pour les moteurs à essence. Malgré ce succès, beaucoup reste à faire pour améliorer la dépollution à basse température et pour des conditions d'utilisations très différentes telles que celles imposées par les moteurs Diesel et "lean burn". Lors de ce travail nous nous sommes intéressés à ces sujets. Tout d'abord, nous avons étudié l'effet du SO2 sur la réduction catalytique sélective des NOx sur des catalyseurs Ag/Al2O3 dans les conditions des moteurs Diesel. Le dioxyde de soufre est reconnu comme un poison de catalyseurs. Dans cette thèse, nous avons étudié un effet promoteur du SO2. Les catalyseurs qui ont fait l’objet de ce travail ont été préparés au laboratoire. Nous avons fait varier différents paramètres tels que la température, la nature de l'hydrocarbure ou encore la concentration de SO2 afin de mieux cerner cet effet promoteur. Nous avons mis en évidence que cet effet promoteur est observable lorsque le propène est utilisé comme réducteur, alors qu'avec le propane il s'agit plutôt d'un effet négatif du SO2. Le deuxième sujet étudié dans ce travail est l'oxydation du CO sur des catalyseurs Au/TiO2, soit préparés au laboratoire, soit fournis comme référence du World Gold Council. Ces catalyseurs offrent l’avantage de pouvoir oxyder le CO à basse température, ce qui pourrait résoudre le problème de la pollution liée au démarrage à froid des automobiles. Ces catalyseurs subissent une désactivation que nous avons analysée par spectroscopie infrarouge (DRIFT et FTIR). Une étude XPS-SIMS de catalyseurs ayant des activités différentes nous a permis de mettre en évidence des concentrations de sodium différentes sur ces catalyseurs. Dans cette thèse, nous nous sommes plus particulièrement intéressés à l'influence du potassium. Pour mettre en évidence l'influence de celui-ci sur l'activité catalytique, des catalyseurs Au/TiO2 furent préparés en absence stricte d'alcalins et d'alcalino-terreux pour ajouter par après, de manière contrôlée, les quantités souhaitées de potassium. La composition des catalyseurs préparés fut contrôlée par XPS-SIMS. Il s'avère que la présence de potassium permet d'accroître l'activité catalytique, néanmoins il semble y avoir une concentration optimale de potassium qui varie en fonction de la composition/morphologie du catalyseur Au/TiO2 au départ, c'est-à-dire sans modification par ajout de potassium.

Rural areas tied to natural resource-based economic activity are encountering difficulties in preparing for economic growth and development. An important problem facing local officials of such an area, Union County, Oregon, is the identification of county characteristics that may induce the expansion of local businesses and location of new plants. What are Union County's most important locational advantages and disadvantages? This thesis attempts to answer these and related questions through the use of a survey of Union County businessmen. During the summer months of 1975, interviews with 30 percent of all Union County businesses were conducted. The primary locational determinants for firms in all business sectors were found to be personal and market factors. With few exceptions all firms assigned the same importance to these and other location factors, regardless of type of firm, geographic location in Union County, respondent's role in the location decision, year the firm was founded, or future expansion plans. The industry types that would be expected to expand or locate in Union County are lumber and wood products, light industry (small manufacturing), general agriculture, tourism, and wholesale-retail trade. The policies and incentives available to Union County officials are limited due to the role of factors, such as personal preference and market demand, over which the county has little control. Maintenance and improvement of the existing county infrastructure and reevaluation of land use regulations as they affect business location, operation, and expansion offer the most potential for influencing firms to locate in an area that offers both pleasant surroundings and the opportunity to sustain economic growth. / Graduation date: 1977

This study examines the spatial and temporal characteristics of the surface air temperature in Portland, Oregon. Spatial temperature patterns indicate that the dominant control factors on seasonal temperature distribution are local topography, elevation, and urban-rural differences in surface structure. A heat island exists in the Portland area; the intensity of the heat island rang€s from 4° to 10° F, and varies throughout the year. The strongest heat island is found in the July minimum temperature. Temperature distribution in Portland and the adjacent area is affected by winds and rainy conditions, but less influenced under overcast skies. The long-term temperature over the last century shows that Portland's mean annual temperature trends are 0.057° F/yr and 0.052° F/yr in the two warming periods 1900-1940 and 1961-1984, respectively, and these warming trends are largely due to warming in spring and early summer as well as in winter months except January. Comparisons between Portland and other local non-urban climatic stations show a general warming trend in Portland since the end of the last century, which is 0.028° F/yr in the mean annual temperature, and 0.017° F/yr in maximum temperature after the regional trends are removed. Monthly mean temperature in July and January demonstrate a warming by 0.023° F/yr and 0.015° F/yr at Portland, respectively. All these warming trends are due mainly to the impact of urbanization. It is found that the cooling effect on the northern Willamette Valley due to the presence of the Columbia Gorge is most noticeable in the daytime and in January.

Graduation date: 1980

A structure map was constructed of the continental shelf between Cape Blanco and Coos Bay, Oregon, exclusively from an interpretation of approximately 700 km of continuous seismic profiles. At least ten discernible seismic units were mapped on the bases of acoustic appearance, lateral continuity, angular unconformities, and faults. The offshore units tentatively were correlated with onshore geology and are believed to range in age from the latest Jurassic to late Pleistocene. The sparker profiles reveal that the continental shelf off southern Oregon has experienced significant late Tertiary and Quaternary accretion due to deposition and tectonic uplift. The oldest rock exposures, believed to be the latest Jurassic in age, crop out on the inner continental shelf on the topographic highs off Cape Blanco and Coquille Point. Erosional remnants of probable Late Cretaceous turbidites and the middle Eocene sandstone beds also are exposed on the bathymetric high on the inner shelf southwest of Cape Arago. The initial emplacement of these three uplifted structural blocks is probably a result of late Eocene wrench faulting of the Port Orford shear zone and of the postulated shear zone at Coquille Point. No other early Tertiary sediments apparently are exposed on this portion of the Oregon continental shelf, but they probably extend seaward at depth on the continental margin. Middle Tertiary strata are believed to be exposed on the outer shelf topographic high southwest of Cape Arago. Sediments of Miocene to Pliocene age were deposited throughout much of the continental shelf that was surveyed. The greatest amount of deposition occurred in a north-south trending basin between Cape Blanco and Coquille Bank. Late to post-Pliocene tectonism uplifted and exposed the older underlying rocks on the inner shelf, which are probably of uppermost Jurassic to middle Tertiary age. These same stresses also deformed the Mio-Pliocene sediments into gently undulating structures on the inner shelf. The greatest deformation occurred on the outer shelf and formed Coquille Bank, a north-south trending, doubly plunging, asymmetrical anticline. The terraces or benches on the upper continental slope to the north and south of the Bank are structural features resulting from the doubly plunging anticline. Eustatic sea level lowerings during the Pleistocene truncated the shelf structures as deep as 130 m below present sea level. The detritus was deposited as a wedge of sediments, which forms an unconformable contact with the underlying strata on the outer shelf and upper slope between Coos Bay and Coquille Bank. In areas of deposition there is no distinct break between the shelf and the upper slope; the former merely merges into the latter in a continuous convex curve. In areas of nondeposition, the edge of the shelf is an erosional and structural feature. A possible buried channel was detected northwest of the mouth of the Coquille River. This sediment filled channel is believed to be an erosional remnant of a former course of the Coquille River during a lower stand of sea level. / Graduation date: 1969

Thesis (Ph. D.)--University of Washington, 1984. / Vita. Bibliography: leaves [439]-460.

Thesis (M.S.)--Oregon State University, 1983. / Typescript (photocopy). Includes bibliographical references (leaves 91-104). Also available on the World Wide Web.

The literature on clinical interventions for suicide prevention indicates that low-income, suicidal African American females are an historically underserved population. Contributing to this lack of service are the intersecting influences of race, ethnicity, culture, gender, sexual orientation, socioeconomic status and related oppressions (APA, 2007). In suicidal African American females, a higher level of reported symptoms of posttraumatic stress disorder has been found in suicide attempters as compared to nonattempters (Kaslow et al., 2000), and PTSD has been shown to be associated with heightened risk of an ensuing suicide attempt (Wilcox, Storr, & Breslau, 2009). One factor affecting manifestation of PTSD symptoms is attachment style. When a person with an insecure attachment style experiences a traumatic event(s), they are more likely to develop PTSD (Dieperink, Leskela, Thuras, & Engdahl, 2001). However, if effective coping methods are learned, more severe symptoms of PTSD are less likely (e.g., DeRoma et al., 2003; Johnsen, Eid, Laberg, & Thayer, 2002). Multiple studies examining the relationship between attachment style and coping find insecure attachment linked to poor coping skills (e.g., Schmidt, Nachtigall, Wuethrich-Martone, & Strauss, 2002; Yih-Lan, 2003). Those with insecure attachment styles are more likely to employ less effective coping methods leading to increased distress and interpersonal problems. However, there is research to support the possibility of insecure attachment style shifting to a more secure form, potentially through learning coping skills that offset maladaptive coping. This study examined the mediating role of coping on the relationship between attachment style and PTSD symptoms. One hundred and fifty African American women enrolled in a project designed to understand the experiences of low income, African American women completed a Demographic Data Questionnaire, The Relationship Style Questionnaire (RSQ) (Griffin & Bartholomew, 1994), The Ways of Coping, Revised (Folkman & Lazarus, 1985), and The Posttraumatic Diagnostic Scale (PDS) (Foa, Cashman, Jaycox, & Perry, 1997). The relationships among factors were examined using Structural Equation Modeling. Results indicated a significant direct path between Insecure Attachment and PTSD Symptoms of moderately weak strength, between Insecure Attachment and Emotion-Focused Coping of moderate strength, and between Insecure Attachment and Problem-Focused Coping of moderately weak strength. However, neither Emotion-Focused nor Problem-Focused Coping mediated the relationship between Insecure Attachment and PTSD symptoms. Clinical implications, limitations of the study, and future directions are discussed in terms of these results.

Typescript. Includes vita and abstract. Includes appendix: ArcGIS VBA script code. Includes bibliographical references (leaves 106-108). Also available online in Scholars' Bank.

Zugl.: Darmstadt, Techn. Univ., Diss., 2009