Index Catalog // ScholarsArchive@OSU

β-lactoglubin adsorption equilibrium and kinetics at silanized silica surfaces

Creator:: Krisdhasima, Viwat
Abstract:: The adsorption equilibrium and kinetic behavior exhibited by β-lactoglobulin at silanized silicon surfaces of varying hydrophobicity were examined using ellipsometry. Adsorption equilibrium results were used to construct adsorption isotherms; the adsorbed mass of β-lactoglobulin was observed to increase with increasing surface hydrophobicity, within a defined range of hydrophobicity. Adsorption kinetics...
Resource Type:: Dissertation

Zeatin O-xylosyltransferase in Phaseolus vulgaris : immunological and molecular analyses

Creator:: Martin, Ruth C.
Abstract:: Cytokinins are a group of plant hormones mediating cell division and differentiation. Zeatin is a naturally occurring and highly active cytokinin that is rapidly metabolized in Phaseolus seeds. The metabolites and enzymes mediating the conversion have been studied extensively. Zeatin metabolic enzymes may be utilized in studying the regulation of...
Resource Type:: Dissertation

Young stand thinning in Western Oregon : cost comparison of harvesting alternatives and comparison of time study techniques

Creator:: Hossain, Mohammad Mozaffar
Abstract:: Harvesting costs were determined for commercial thinning of young stands to achieve vegetation and wildlife objectives. This included replicated comparisons of thinning treatments. Treatments were defined based on residual tree stocking after thinning. Study procedures were developed and evaluated to improve statistical relevance. Multiple linear regression models were used to...
Resource Type:: Dissertation

Xylem cavitation in newly planted western hemlock (Tsuga heterophylla (Raf.) Sarg.) seedlings

Creator:: Kavanagh, Kathleen L., 1955-
Abstract:: Reforestation of Pacific Northwest forest-lands with western hemlock has been hindered by unexplained plantation failures. The purpose of this thesis is to provide information that will help in determining the cause of seedling damage and mortality. The studies focused on the relationship between xylem water potential, xylem cavitation and the...
Resource Type:: Dissertation

Wood quality studies in second-growth western redcedar (Thuja plicata Donn.)

Creator:: DeBell, Jeffrey D.
Abstract:: Western redcedar (Thuja plicata Donn.) is a valuable commercial species found in the northwestern United States and southwestern Canada. This dissertation includes four papers focused on wood and stem characteristics of second-growth western redcedar, and how those characteristics vary within the stem or how they are influenced by cultural practices....
Resource Type:: Dissertation

Women's perceptions of their children's experiences in domestic violence

Creator:: Wood, Barbara L.
Abstract:: Ten female survivors of physically assaultive domestic violence were interviewed three times each in a feminist, qualitative study designed to access their perceptions about their children's experiences in domestic violence. All participants had children living with them at the time of the abuse and were one to five years out...
Resource Type:: Dissertation

Women's feelings about the work-family interface of long-haul truck drivers : six days on the road and he's gonna be home tonight

Creator:: Moon, Susan F.
Abstract:: Long-haul truck drivers are absent from their families for prolonged periods of time. This paper examines the methods trucking families use to remain connected given such absences. Interviews with ten women married to long-haul truck drivers underwent qualitative analysis. Initially, personal profiles were developed to illustrate life experiences of the...
Resource Type:: Dissertation

Women's alcohol consumption : personal, familial, and geopolitical dimensions

Creator:: Goetz, Kathryn W.
Abstract:: A sample of 1,003 women, age 22 in 1983-84 and age 27 in 1988-89, were selected from the National Longitudinal Survey of Youth. Personal, familial, and geopolitical predictors of alcohol consumption were evaluated at each time period and longitudinally. The study integrated macro- and micro-level influences to determine their influence...
Resource Type:: Dissertation

Whole farm case studies : a how-to guide

Creator:: Murray, Helene
Abstract:: Calls for increased farmer involvement in research and extension programs have been numerous and well supported. One approach to integrate the collective knowledge and experience of agricultural scientists and farmers is through whole farm case studies (WFCS). An interdisciplinary team of 34 research and extension personnel at Oregon and Washington...
Resource Type:: Dissertation

Who's in place, who's out of place : examining the politics of natural resource collaboration

Creator:: Cheng, Antony S.
Abstract:: A qualitative research approach composed of three strategies was employed to systematically examine the politics of natural resource collaboration. First, using the Oregon Plan for Salmon and Watersheds as a case study, the behavioral assumptions of natural resource policy instruments enabling collaboration were uncovered and analyzed. Three key assumptions emerge:...
Resource Type:: Dissertation

Wheat genotypes selected under optimum conditions and their response to water and heat stress

Creator:: Briceno-Felix, Guillermo Ariel
Abstract:: Concerns have been expressed that wheat (Triticum aestivum L.) cultivars selected under optimum conditions may lack adequate adaptation for stress environments. Experimental populations were grown under three environmental conditions 1) optimum, 2) reduced irrigation, and 3) high temperature. Field experiments were conducted at the Center for Northwest Experimental Station (CIANO),...
Resource Type:: Dissertation

Welfare distribution effects of US rice policies

Creator:: De Silva, G. A. Canute
Resource Type:: Dissertation

Weighted vest exercise improves functional ability in women over 75 years of age

Creator:: Protiva, Karen W.
Abstract:: The purpose of this study was to determine the effects of long-term weighted vest exercise on hip bone mass, functional ability and static balance in elderly women. This was a within subject exercise intervention study and included a 6-month control period. Twenty-three subjects (age 85 ± 6) were recruited and...
Resource Type:: Dissertation

Wave runup on high energy dissipative beaches and the prediction of coastal erosion

Creator:: Ruggiero, Peter
Resource Type:: Dissertation

Wave competence and morphodynamics of boulder and gravel beaches

Creator:: Lorang, Mark
Resource Type:: Dissertation

Watershed-scale vegetation patterns in a late-successional forest landscape in the Oregon Coast Range

Creator:: Wimberly, Michael C.
Abstract:: Knowledge about vegetation patterns and ecological processes in unmanaged, late-successional watersheds is needed to provide a foundation for forest management strategies aimed at conserving native biodiversity. I examined influences of environmental variability and disturbance history on forest structure and composition in the Cummins Creek Wilderness, located on the central Oregon...
Resource Type:: Dissertation

Watershed councils and woodland owners : the Oregon experience

Creator:: Rickenbach, Mark G., 1968-
Abstract:: Oregon's watershed councils are local, non-regulatory, collaborative forums charged with the recovery of endangered salmon and improving water quality under The Oregon Plan for Salmon and Watersheds. Private forest landowners, given their prominence is owning riparian areas, are central to success of these efforts. Using a statewide survey of watershed...
Resource Type:: Dissertation

Water savings and on-farm production effects when irrigation technology changes:the case of the Klamath Basin

Creator:: Burke, Susan M.
Abstract:: The overall objective of the study is to measure changes in agricultural production and water use patterns under various water supply and allocation mechanisms. The methodology nests an economic model of on-farm decisions in a basin-wide hydrologic model. The economic model forecasts the use of applied water, technology and crop...
Resource Type:: Dissertation

Water relations, stomatal conductance, and abscisic acid content of container-grown apple (Malus domestica Borkh.) plants in response to sorbitol-induced osmotic stress

Creator:: Guak, Sunghee
Abstract:: Sorbitol-induced osmotic stress (SIOS) to the root was found to be effective in reducing transpirational water loss in plants during water stress. Mechanisms of SIOS in stomatal control were investigated in containerized apples (Malus domestica Borkh. 'Gala'/M26) when leaf water potential (Ψw), osmotic potential (Ψs), turgor potential (Ψp), stomatal conductance...
Resource Type:: Dissertation

Water relations, gas exchange, and growth responses of Douglas-fir seedlings to stresses associated with transplanting

Creator:: Joseph, Gladwin
Abstract:: The goal of this thesis was to determine the physiological mechanisms that link adverse preplanting treatments of Douglas-fir, such as exposure and root pruning, to the phenomenon of transplanting shock. The objective of experiments 1 and 2 was to measure the effect of exposure and pruning on the physiology and...
Resource Type:: Dissertation

Water relations in red and white clover seed crops

Creator:: Oliva, Ruben N.
Abstract:: Both red (Trifolium pratense L.) and white (Trifolium repens L.) clover seed yields can be highly variable and low in western Oregon. The objectives of this study were to: i) determine crop water requirements and supplemental irrigation timing, and ii) quantify the effects of soil and water status on inflorescence...
Resource Type:: Dissertation

Water quality modulation of aluminum toxicity to rainbow trout (Oncorhynchus mykiss) : biological and physiological approaches

Creator:: Gundersen, Deke T.
Resource Type:: Dissertation

Water partitioning and respiration activity of dormant grape buds

Creator:: Gardea, Alfonso A.
Abstract:: Dormancy of 'Pinot Noir' grapevines was characterized. Primary buds required ca 300 cumulative chilling hours (CCH) to initiate the transition from endodormancy to ecodormancy, which occurred in mid November. Additional chilling, up to 1000 CCH, improved budbreak. Changes in bud water content were estimated by gravimetric and spectroscopic methods. Total,...
Resource Type:: Dissertation

Water management effects on birdsfoot trefoil seed production

Creator:: García-Díaz, Carlos Alberto
Abstract:: There is no information available on water management of birdsfoot trefoil grown for seed. Information is also not available describing how to minimize seed losses due to shattering in order to obtain consistently high birdsfoot trefoil seed yields. The objectives of this research are to: (i) quantify crop water use,...
Resource Type:: Dissertation

Water and solute transport : modeling and application to water conservation in layered soil

Creator:: Mohammed, Fareed H. A. N.
Abstract:: Sandy soils are among the least productive soils because of their inability to store adequate water for plant growth. Their high percolation rate not only allows water to move quickly beyond the root zone, but also washes nutrients below the reach of plant roots. High evaporation occurs from the soil...
Resource Type:: Dissertation

Voltage sag and momentary interruption ride-through for adjustable speed drives

Creator:: van Zyl, Annabelle
Abstract:: The awareness of electric power quality has increased over the past decade as electronic equipment has become more susceptible to power disturbances. The most disruptive power disturbances are voltage sags and momentary interruptions and their effect on adjustable speed drives (ASDs) is studied in this thesis. Several solutions have been...
Resource Type:: Dissertation

Volcanology and petrology of the Rattlesnake Ash-Flow Tuff, eastern Oregon

Creator:: Streck, Martin J.
Abstract:: The Rattlesnake Ash-Flow Tuff erupted 7.05±0.01 Ma from the western Harney Basin, southeastern Oregon. The location of the vent area is inferred based on vent-ward increases in size of pumices, in degree of welding, and in degree of post-emplacement crystallization. Today's outcrops cover 9000 km2 and estimated original outcrop coverage...
Resource Type:: Dissertation

Vitellogenesis : a biomarker for estrogenic and antiestrogenic effects of organochlorines in rainbow trout

Creator:: Donohoe, Regina M.
Abstract:: Persistent organochlorines (OCs) bioaccumulate in aquatic biota and potentially impair reproduction via endocrine disruption. The present research evaluated estrogenic effects of the OCs, chlordecone (CD) and o,p'-DDT/DDE, and the antiestrogenicity of 3,4,5,3',4',5'-hexachlorobiphenyl (345-HCB) in juvenile rainbow trout, utilizing vitellogenesis as a biomarker. Vitellogenesis, estrogen regulated hepatic production of the yolk...
Resource Type:: Dissertation

Vitamin B-6 status, energy and protein intakes, and amino acids in the diets and plasma of school-aged patients with Phenylketonuria : implications for an improved nutritional treatment

Creator:: Prince, Annie
Abstract:: Dietary intake data of 15 treated patients with phenylketonuria (PKU) (7-17 years) and six control siblings (6-14 years) were used to evaluate the effectiveness of medical foods to balance energy, protein, vitamin B-6, and individual amino acids from natural foods and to evaluate vitamin B-6 status. Four-day diet records were...
Resource Type:: Dissertation

Visualization and reification of concepts in advanced mathematical thinking

Creator:: Krussel, Carolyn E. S.
Abstract:: A concept image is that collection of all images, pictures, symbols, definitions and properties associated with any given mathematical concept. One of the most important components in the mental representation of concepts in the concept image of advanced mathematical thinkers is visualization. This component, in turn, is indispensable in the...
Resource Type:: Dissertation

Viscosity and bond quality of urea formaldehyde adhesive extended with acid modified and phosphorylated sago (Metroxylon sp)

Creator:: Sumadiwangsa, Suwardi
Abstract:: It was the goal of this research to determine if sago starch could be used to replace wheat flour as an adhesive extender of Urea-formaldehyde plywood adhesives through either chemical modification of the starch or modification of the adhesive formulation strategy. Guiding principles of the research would be that a...
Resource Type:: Dissertation

Virus resistance in transgenic plants expressing translatable and untranslatable forms of the tobacco etch virus coat protein gene sequence

Creator:: Lindbo, John A.
Resource Type:: Dissertation

Vibration-rotational studies of isotopic variants of diatomic molecules

Creator:: Orlov, Mikhail L.
Resource Type:: Dissertation

Variation in plant response to inoculation with different isolates of vesicular arbuscular mycorrhizal fungi

Creator:: Ianson, David C.
Resource Type:: Dissertation

Variability of late Neogene eastern equatorial Pacific carbonate sedimentation and global ice volume on timescales from 10,000 years to 1 million years

Creator:: Hagelberg, Teresa King
Abstract:: Sedimentary sections recovered during the Deep Sea Drilling Project and the Ocean Drilling Program provide the opportunity to study the evolution of Neogene climate at high resolution overtime periods spanning millions of years. Two components of the paleodlimatic system, eastern equatorial Pacific carbonate sedimentation and global ice volume, were examined...
Resource Type:: Dissertation

Valuing nonmarket goods and services : a test for bias in the iterated referendum-contingent valuation format

Creator:: McLeod, Donald M.
Abstract:: Contingent valuation has been used to elicit values for changes in the quantity and quality of nonmarket amenities. Yet hypothetically trading dollars for environmental improvements is not a familiar activity for most survey respondents. A variety of response effects associated with survey collected data can potentially lead to biased contingent...
Resource Type:: Dissertation

Values, assumptions, and actions in an administrative team : a symbolic analysis of the expression of culture in one community college setting

Creator:: Goulard, Elizabeth Ann
Abstract:: Organizational culture is broadly recognized as a significant force in organizational action. Since the phenomenon of culture has real impact on organizations, our understanding of that impact is vital to organizational health. While academic settings provide a rich environment for studying culture, relatively little research on culture has occurred in...
Resource Type:: Dissertation

Values and considerations in education-related choices : a descriptive study of PRC Chinese graduate at a Northwest U.S. University

Creator:: Buys, W. Kent
Abstract:: The purpose of this descriptive study was to explore PRC Chinese graduate student perceptions of their education-related choices at a U.S. university, and to assess the values and considerations underlying these choices. The objectives of the study were to: (a) explore and discover how students perceived and described education in...
Resource Type:: Dissertation

Validation of a cardiorespiratory fitness test for men with mental retardation

Creator:: Rintala, Pauli Olavi
Abstract:: The purpose of this study was to validate a field test of cardiorespiratory fitness for men with mental retardation. The subjects were 19 healthy men with moderate mental retardation whose mean age was 26 years with a mean IQ of 48. Each subject underwent a maximal treadmill test utilizing a...
Resource Type:: Dissertation

Vaccinia virus ribonucleotide reductase : regulation of the gene products and characterization of the recombinant small subunit protein

Creator:: Howell, Meredith L.
Abstract:: Ribonucleotide reductase is a remarkable enzyme that catalyzes the rate-limiting step in the synthesis of the 2'-deoxynucleoside triphosphates. The intent of this project was to characterize the ribonucleotide reductase encoded by the orthopoxvirus, vaccinia. The first objective was to study the structural and functional features of the viral small subunit...
Resource Type:: Dissertation

Vaccinia virus ribonucleotide reductase : gene sequencing, intracellular localization, and interaction with a DNA-binding protein

Creator:: Davis, Ralph Eugene, 1957-
Abstract:: Vaccinia virus infected monkey kidney cells had been previously shown to have an increased ribonucleoside diphosphate reductase (RR) activity. DNA from mutant virus resistant to hydroxyurea were digested with restriction endonucleases and were shown to have substoichiometric amounts of the Hind III F fragment. Additional information from Southern blotting experiments...
Resource Type:: Dissertation

Utilization of wastes from Pacific whiting surimi manufacturing : proteinases and protein hydrolysate

Creator:: Benjakul, Soottawat
Abstract:: Both liquid and solid wastes from Pacific whiting surimi manufacturing were characterized and value-added products were recovered. A proteinase in surimi wash water (SWW) was determined to be cathepsin L with Mr 54,200 on SDS-substrate gel. Heat treatment and acidification shifted the activity zone to M [subscript r] 39,500. No...
Resource Type:: Dissertation

Utilization of lipid by primiparous beef heifers during the postpartum period

Creator:: Filley, Shelby Jean
Resource Type:: Dissertation

Utilization of lignocellulosic polysaccharides

Creator:: Fenske, John J.
Abstract:: Lignocellulosic biomass represents a vast supply of fermentable carbohydrates and functional aromatic compounds. Conversion of lignocellulosics to ethanol and other useful products would be of widespread economical and environmental benefit. Better understanding of the behavior of different lignicellulosic feedstocks in fermentation protocols as well as catalytic activities involved in lignocellulosic...
Resource Type:: Dissertation

Utilization of dietary protein by the mussel, Mytilus edulis trossulus (Linnaeus 1758)

Creator:: Kreeger, Daniel A.
Abstract:: Protein microcapsules (PM) were developed as a tool for investigating aspects of dietary protein utilization by mussels, Mytilus edulis trossulus. Digestion of PM in vitro by protease, trypsin, amylase and extracts from the gut of mussels varied significantly depending on the type of protein encapsulated or whether carbohydrates were added...
Resource Type:: Dissertation

Using Tabu Search to solve tactical forest planning problems with spatial wildlife habitat goals and constraints

Creator:: Boston, Kevin Donald
Abstract:: A method was developed to formulate and solve a fifty-year tactical harvest scheduling problem that included spatial wildlife habitat goals and constraints for a 4800-acre watershed in Northwestern Oregon under four scenarios. Three goals and two habitat constraints were included in each scenario. The first goal was a volume goal....
Resource Type:: Dissertation

Using signaling to aid computer program comprehension

Creator:: Gellenbeck, Edward M.
Abstract:: Guidelines for using style to improve computer program comprehension have often been proposed without empirical testing. This thesis reports on the results of three controlled experiments that investigated ways program style may be used to aid comprehension of source code listings. Experiments 1 and 2 were conducted using advanced computer...
Resource Type:: Dissertation

Using percentile regression for estimating the maximum species richness line

Creator:: Qadir, Mohammad F.
Resource Type:: Dissertation

Using evaluative results in program improvement by public vocational high school instructors in Taiwan

Creator:: Yeh, Chung-ta
Abstract:: The purpose of this study was to explore factors which influence Taiwanese vocational teachers' participation in program evaluations, use of evaluative results and, in turn, program improvement. Twelve Taiwanese public vocational high school teachers were interviewed during February and March 1992. To confirm the responses of the teachers, 12 school...
Resource Type:: Dissertation

Using a geographic information system (GIS) to monitor recreation impacts in a forested setting

Creator:: Wing, Michael
Abstract:: With a growing population and increasing demand for recreation resources, managers of public lands face unique challenges in allocating and overseeing resource use. One of the most reliable methods for gathering information from resource users involves surveying. Summaries and applications of survey results typically have not fully addressed the spatial...
Resource Type:: Dissertation

Uses of Bayesian posterior modes in solving complex estimation problems in statistics

Creator:: Lin, Lie-fen
Abstract:: In Bayesian analysis, means are commonly used to summarize Bayesian posterior distributions. Problems with a large number of parameters often require numerical integrations over many dimensions to obtain means. In this dissertation, posterior modes with respect to appropriate measures are used to summarize Bayesian posterior distributions, using the Newton-Raphson method...
Resource Type:: Dissertation

Use of γ-Glutamyltranspeptidase-deficient knockout mice as a model to study the relationship between glutathione status, mitochondrial dysfunction, and cell death

Creator:: Will, Yvonne
Resource Type:: Dissertation

Use of pineapple juice for inhibition of browning in apples

Creator:: Lozano de Gonzalez, Patricia
Resource Type:: Dissertation

Use of livestock to improve the quality of elk winter range forage in northeastern Oregon

Creator:: Clark, Patrick Eugene
Abstract:: The effects of late spring defoliation on the winter forage quality of bluebunch wheatgrass (Agropyron spicatum [Pursh] Scribn. & Smith), Idaho fescue (Festuca idahoensis Elmer) and elk sedge (Carex geyeri Boott) and the response of wintering Rocky Mountain elk (Cervus elaphus nelsoni Bailey) to changes in winter range forage quality...
Resource Type:: Dissertation

Use of ion-exchange and direct osmotic concentration technologies for processing cantaloupe juice

Creator:: Galeb, Abduljalil D. S.
Resource Type:: Dissertation

Use of anthocyanin analyses to determine glycosidase activity in juice- and wine-processing enzymes

Creator:: Wightman, JoLynne Dee
Resource Type:: Dissertation

Use of a geographical information system to modify pheromone trap-based predictions of Helicoverpa zea (Boddie) damage

Creator:: Drapek, Raymond James
Abstract:: The GRASS (V. 4.0) geographical information system (GIS) was used to test the hypothesis that pheromone trap based predictions of Helicoverpa zea (Boddie) damage in processed sweet corn could be improved by considering spatial patterns of corn plantings and wind blocking features around the trap. Wind blocking features include: tree...
Resource Type:: Dissertation

Uracil-DNA glycosylase inhibitor protein : role of carboxylic acid residues and use for measuring the fidelity of uracil-excision DNA repair synthesis in human cell extracts

Creator:: Sanderson, Russell J.
Resource Type:: Dissertation

Untangling the complexity of nearshore ecosystems : examining issues of scaling and variability in benthic communities

Creator:: Schoch, G. Carl
Abstract:: The objective of this research was to improve our understanding of how changes in the environment affect ecological processes. Change detection is often confounded by the large variation found in ecological data due to the difficulty of finding replicates in nature. Intertidal communities were chosen for studies of biophysical interactions...
Resource Type:: Dissertation

Unstable jet flow along zonal ridge topography

Creator:: Witter, Donna Lynn
Abstract:: Motivated by observations of locally enhanced sea level variability near steep topographic slopes in regions of strong time-mean flows, effects of zonal ridge topography on zonal oceanic jet flow are investigated. Unstable wave properties and the dynamics of eddy-mean flow interaction are evaluated as a function of topographic geometry using...
Resource Type:: Dissertation

University web teaching practice & pedagogy

Creator:: Morihara, Bonnie Bone
Abstract:: Although there is research into student learning on the Web and other computer-supported environments, there has been little investigation into the practice and pedagogy of university Web teachers. This qualitative study used a series of interviews of eight higher education faculty to gather data on their Web teaching practices, and...
Resource Type:: Dissertation

Understory vegetation response and nitrogen cycling following cutting of western juniper

Creator:: Bates, Jonathan D.
Abstract:: Since the late 1880's western juniper has expanded in range and increased in density in sagebrush-bunchgrass, riparian, and forested plant communities of the Pacific Northwest. Succession to western juniper woodland has been shown to reduce the productivity and diversity of the understory component, result in concentration of soil nutrients beneath...
Resource Type:: Dissertation

Understandings of the nature of science and decision making on science and technology based issues

Creator:: Bell, Randy Lee
Abstract:: Current reforms emphasize the development of scientific literacy as the principal goal of science education. The nature of science is considered a critical component of scientific literacy and is assumed to be an important factor in decision making on science and technology based issues. However, little research exists that delineates...
Resource Type:: Dissertation

Understanding the chemistry of rosin sizing and developing new sizing technologies

Creator:: Zhuang, Jinfeng
Abstract:: First, a thermodynamic analysis was carried out upon a sizing-desizing process. The energetic analysis shows that rosin soap size should be bound to fibers through primary chemical forces such as covalent bonds to effect sizing. Secondary chemical forces are all thermodynamically unstable to the attack of water molecules. It is...
Resource Type:: Dissertation

Understanding and improving error-correcting output coding

Creator:: Kong, Eun Bae
Abstract:: Error-correcting output coding (ECOC) is a method for converting a k-classsupervised learning problem into a large number L of two-class supervised learningproblems and then combining the results of these L evaluations. Previous researchhas shown that ECOC can dramatically improve the classi cation accuracy of supervisedlearning algorithms that learn to classify...
Resource Type:: Dissertation

Underplanting and competition in thinned Douglas-fir

Creator:: Brandeis, Thomas James
Abstract:: Understory conifer regeneration needs to occur beneath conifer-dominated canopies if two-storied or uneven-aged structures are to be considered for western Oregon Coast Range stand management. To ensure adequate numbers of seedlings to meet stocking or habitat structure objectives, planting may be a solution. We undertook a multi-level study to determine...
Resource Type:: Dissertation

Ultra low voltage DRAM current sense amplifier with body bias techniques

Creator:: Gang, Yung-jin, 1957-
Abstract:: The major limiting factor of DRAM access time is the low transconductance of the MOSFET's which have only limited current drive capability. The bipolar junction transistor(BJT) has a collector current amplification factor, β, times base current and is limited mostly by the willingness to supply this base current. This collector...
Resource Type:: Dissertation

Two epidemiological studies in central Haiti

Creator:: Bonnlander, Heinke P.
Abstract:: Two epidemiological studies, designed to expand our knowledge of morbidity and mortality indicators concerning malaria and Bacillus Calmette-Guerin vaccination in the Hospital Albert Schweitzer health district located in Central Haiti's Artibonite Valley, are presented. The hospital serves a rural population of 190,000 in its 610 square mile district. A large...
Resource Type:: Dissertation

Turbulent and gravity wave transport in the free atmosphere

Creator:: Kim, Jinwon
Resource Type:: Dissertation

Turbulence induced loads on a teetered rotor

Creator:: Weber, Timothy L.
Abstract:: Development of variable speed horizontal axis wind turbines has resulted in a need for an analysis code with a rotor speed degree-of-freedom. This study develops a five degree-of-freedom time domain computer code that evaluates blade and rotor, mean and cyclic loads with nonlinear aerodynamics together with atmospheric turbulence as a...
Resource Type:: Dissertation

Trends in wilderness use and their social and ecological implications

Creator:: Hall, Troy E.
Abstract:: Three studies were performed in Oregon wildernesses. The first used wilderness permit and trailhead registration data to evaluate trends in use of Three Sisters, Mt. Jefferson, and Eagle Cap Wildernesses from 1976 to 1994. Recreational visitor days were found to have declined, but the number of visits increased dramatically, because...
Resource Type:: Dissertation

Tree seedling establishment on heterogenous microsites in Douglas-fir forest canopy gaps

Creator:: Gray, Andrew N.
Abstract:: Tree seedling establishment and growth were studied in experimental canopy gaps to determine the effect of structural and environmental heterogeneity on species dynamics within mature and old-growth Douglas-fir forests in the Cascades of central Oregon and southern Washington. Factors examined included forest age, gap size, within-gap position. substrate, year of...
Resource Type:: Dissertation

Tree mortality in midwestern oak-hickory forests : rates and processes

Creator:: Pedersen, Brian S.
Resource Type:: Dissertation

Tree and crop productivity and soil organic matter changes as influenced by Leucaena hedge-row management in sub-humid India

Creator:: Singh, Rajive K.
Abstract:: The overall objective of this study was to evaluate biomass production and soil ameliorative potential of alley farming in sub-humid India. Effect of the cutting height (40, 80, 120, 160 cm) of Leucaena hedges and root barriers on biomass yield of Leucaena and maize and wheat crops were examined. Trees...
Resource Type:: Dissertation

Treatment of dairy wastewater in a constructed wetland system : evapotranspiration, hydrology, hydraulics, treatment performance, and nitrogen cycling processes

Creator:: Niswander, Steven Francis
Abstract:: Five unique but related studies were conducted at the Oregon State University Dairy Wetland Treatment System (OSUDWTS), Corvallis, OR. The research site consisted of six parallel wetland cells, which were built in 1992 and began receiving concentrated dairy wastewater in the fall of 1993. Hydrologic, hydraulic, and water quality data...
Resource Type:: Dissertation

Transmission of disseminated neoplasia in the soft shell clam, Mya arenaria

Creator:: House, Marcia
Abstract:: Disseminated neoplasia (DN) is a proliferative cell disorder that occurs in the circulatory system of bivalves. The condition is progressive and lethal. At least 15 species of bivalves over a wide range of geographic locations have been reported to contract DN. Prevalence levels of disseminated neoplasia can reach up to...
Resource Type:: Dissertation

Transitioning from content centered instruction to student centered learning : a qualitative study of one community college instructor's experience

Creator:: Stevens, Malia L.
Abstract:: For the past 100 years, the prominent instructional model for all public education in the United States has been teacher/content centered with the intent of covering a discrete body of knowledge in a given period of time. As the end of the twentieth century approaches, natural, social, political, and economic...
Resource Type:: Dissertation

Transient nonlinear deformations of viscoelastic membranes

Creator:: Jenkins, Christopher H. M.
Resource Type:: Dissertation

Transhumance as an adaptive strategy of West Coast RV retirees

Creator:: Williams, Diane
Abstract:: This ethnography describes RV [recreational vehicle] seasonal migration as an adaptive, transhumant strategy. The study population is retired, transhumant migrants, who are members of a nation-wide, membership camping organization. Fieldwork was conducted over a period of seven months at two sites located on the West Coast. These sites reflect northern...
Resource Type:: Dissertation

Transformations of sulfur in wetland rice soils

Creator:: Islam, M. Mujibul
Resource Type:: Dissertation

Transformation of tobacco with the yeast FRE1 and FRE2 genes : characterization of transformants and discovery of a temperature-dependent morphological mutant

Creator:: Samuelsen, Andrew Ira
Abstract:: A key mechanism utilized by plants to make iron (Fe) available for uptake is the reduction of Fe(III) to Fe(II) via an inducible, plasma membrane-bound Fe(III) reductase. Genes encoding such enzymes have not yet been isolated from plants; however, two Fe(III) reductases have been cloned from yeast. FRE1 and FRE2...
Resource Type:: Dissertation

Transformation of halogenated methanes by microbially-reduced vitamin B₁₂

Creator:: Workman, Darla J.
Resource Type:: Dissertation

Transfers of water rights in New Mexico's Rio Grande basin : spatiotemporal and sociocultural patterns

Creator:: Shively, David D.
Abstract:: Water right marketing and transfers represent a resource reallocation strategy that has received considerable attention in the American West owing to nearly full appropriation of water in the region. Several western states permit transfers between different uses and places of use thus allowing water to move to higher-value economic activities....
Resource Type:: Dissertation

Transcriptional regulation of Rhizobium meliloti nitrogen fixation genes

Creator:: Evans, Paul D.
Abstract:: The transcriptional promoter sequences for the Rhizobium meliloti nitrogen fixation genes nifA and nifB were cloned to a β-galactosidase gene fusion plasmid vector and transferred by homologous recombination to a specialized transducing phage. The promoter fusions were then transduced to a recombination deficient strain of Escherichia coli as single-copy lysogens...
Resource Type:: Dissertation

Training school administrators in the prevention of child sexual abuse in the school setting

Creator:: Just, Valva D.
Abstract:: School administrators are required by law to report suspected cases of child abuse. They create serious legal and moral consequences for their school districts when they fail to report suspicions of child abuse occurring in the school setting. Studies consistently find that child sexual abuse is under-reported and that allegations...
Resource Type:: Dissertation

Trace element distribution in igneous minerals and liquids

Creator:: Forsythe, Lance M.
Resource Type:: Dissertation

Towards the understanding of the function of the histone "tails" with respect to the structure, stability, and function of chromatin

Creator:: Dong, Feng
Abstract:: By using immobilized trypsin, I have been able to prepare well-defined, stable trypsinized nucleosomes. The difficulties of lacking of control in the extent of trypsinization, which were encountered in previous studies with the use of free trypsin, have been eliminated. The nucleosomes and oligonucleosomes prepared by immobilized trypsin are suitable...
Resource Type:: Dissertation

Towards architecture-adaptable parallel programming

Creator:: Kumaran, Santhosh
Abstract:: There is a software gap in parallel processing. The short lifespan and small installation base of parallel architectures have made it economically infeasible to develop platform-specific parallel programming environments that deliver performance and programmability. One obvious solution is to build architecture-independent programming environments. But the architecture independence usually comes at...
Resource Type:: Dissertation

Tourism and community perceptions : an examination of Mount St. Helens' tourism as perceived by local residents

Creator:: Baker, Randal G.
Abstract:: Since the eruption of Mount St. Helens on May 18,1980, the rural communities within its shadow have experienced tremendous change. Tourism has become a highly visible and somewhat controversial component of change in the region, and its importance to local economies has increased. As a result of increased tourism development...
Resource Type:: Dissertation

Total synthesis of (+)-bourgeanic acid and conformational analysis of its dilactone

Creator:: Johnson, Alan T. (Alan Thomas), 1957-
Resource Type:: Dissertation

Topics in toroidal interconnection networks

Creator:: Broeg, Robert Richard
Resource Type:: Dissertation

Topics in international trade : the economic and environmental effect of capital liberalization in developing countries

Creator:: Cho, Bong-jae
Abstract:: This paper uses general equilibrium static and dynamic models to examine the economic and environmental effect of capital liberalization policy based on the general equilibrium static and dynamic models. The first topic develops a static general equilibrium model of a small open economy in the presence of unemployment with three...
Resource Type:: Dissertation

Topics in applied microeconomics : time allocation and natural resource use on Alaska's North Slope and market power in the U.S. motor carrier industry

Creator:: Nebesky, William E.
Abstract:: This paper presents two applications of empirical microeconomics based on choice theoretic optimization principles. The first topic explores the determinants of subsistence time allocation in a utility theoretic model of household production. The second topic examines firm pricing behavior in a deregulated, but concentrated industry setting. The first part of...
Resource Type:: Dissertation

Topics in applied microeconomics : estimating the value of commercial land and testing the efficiency of the U.S. Motor Carrier industry

Creator:: Lee, Man-keung
Abstract:: This thesis consists of two essays on applied microeconomics issues. The first essay presents a hedonic price econometric model of vacant commercial land. The second essay presents cost frontier analysis on the industry and firm's performance of the U.S. Motor Carrier industry. Our hedonic price econometric model includes two new...
Resource Type:: Dissertation

Time-temperature effects on Cheddar cheese ripening : an interpretation of microbial, chemical and sensory changes

Creator:: Bouzas, Jorge
Resource Type:: Dissertation

Time-of-flight scattering and recoil spectrometry (TOF-SARS) applied to molecular liquid surfaces : a new approach to surface composition and orientation

Creator:: Gannon, Thomas J.
Abstract:: In spite of their importance in many systems, liquid surfaces have been explored at the microscopic level to a much lesser extent than solids. Most surface analysis must take place in vacuum, a major drawback for liquids. The technique of time-of-flight scattering and recoil spectrometry (TOF-SARS) has been applied to...
Resource Type:: Dissertation

Time is the key to reform : a study of teacher perceptions regarding a change in a middle school schedule

Creator:: Olsen, Kris J.
Abstract:: Time is the educational resource educators most desire, but which is in shortest supply. Educators cannot add more days to the 12-month calendar year, or minutes to the day. Whatever control is to be had over the calendar and clock rests in the way time is managed by those in...
Resource Type:: Dissertation

Time domain simulation of Maxwell's equations by the method of characteristics

Creator:: Orhanovic, Neven
Abstract:: A numerical method based on the the method of characteristics for hyperbolic systems of partial differential equations in four independent variables is developed and used for solving time domain Maxwell's equations. The method uses the characteristic hypersurfaces and the characteristic conditions to derive a set of independent equations relating the...
Resource Type:: Dissertation

Time domain modeling of electromagnetic radiation with application to ultrafast electronic and wireless communication

Creator:: Remley, Catherine A.
Abstract:: A versatile computational technique for improved time domain modeling of electromagnetic radiative systems is demonstrated. Two computational methods are combined: the finite-difference time domain (FDTD) method, a full-wave electromagnetic field solver, and the Kirchhoff surface integral formulation, a spatial transformation technique. The combined FDTD/Kirchhoff technique is shown to increase accuracy...
Resource Type:: Dissertation

Three-dimensional, nonlinear viscoelastic analysis of laminated composites : a finite element approach

Creator:: Wang, Min
Abstract:: Polymeric composites exhibit time-dependent behavior, which raises a concern about their long term durability and leads to a viscoelastic study of these materials. Linear viscoelastic analysis has been found to be inadequate because many polymers exhibit nonlinear viscoelastic behavior. Classical laminate theory is commonly used in the study of laminated...
Resource Type:: Dissertation

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