The Oregon State University (OSU) Advanced Plant Experiment (APEX) is a one-fourth height, one-half time scale, reduced pressure integral systems test facility designed to model the long-term cooling capabilities of the emergency core cooling systems of the Westinghouse AP600. This study provides a brief description of the APEX test facility,...
This thesis examines a range of generic influences in William Shakespeare's Richard II. By exploring the play's references to conflicting interpretations of history from different generic perspectives, I hope to advance a more nuanced reading of the play's dynamic staging of history. In Chapter One, I suggest that Richard II...
Antibacterial activities in the salivary glands of
female mosquitoes Aedes aegypti were investigated in this
study.
The mean salivary bacteriolytic activity, during a
period of 14-day of female mosquitoes exposed to five
different concentrations of Gram-positive bacteria
Micrococcus lysodeikticus in the sucrose meal, was
detected by a lysoplate method. A...
Few parenting curricula exist that are culturally-appropriate to the Mexican-immigrant population served by many programs. The Even Start family literacy program has four integrated components, making it more difficult to find appropriate curricula for the families they serve. During Winter 2006, discussion groups were conducted with participants in two Even...
Western juniper (Juniperus occidentalis Hook) is a species of juniper native to arid regions of the Pacific Northwest. The western juniper tree has a number of competitive strategies that, in conjunction with an almost complete removal of fire from the ecosystem, have resulted in a significant expansion of its population...
Delta-sigma data converters have gained popularity in both analog-to-digital and digital-to-analog converters (ADCs and DACs) due to their simplicity, high linearity and immunity to many analog circuit imperfections. These data converters include features such as oversampling, noise-shaping, and (historically) single-bit quantization. Single-bit converters are preferred for their inherent linearity. This...
Ponderosa pine trees exhibiting large oval scars on
their trunks are found in northeastern Oregon. Patterns
in the occurrence and morphology of the scarred trunks
raise questions of archeological interest. Examination of
ethnographic sources from the Pacific Northwest indicate
that the bark of ponderosa pine was peeled to obtain the...
Beer, nonfat dry milk, fried bacon and microwave baked fish were
treated under simulated gastric and extreme nitrosation conditions to
estimate their capacity for generation of endogenously formed
N-nitrosamines. The level of nitrosamines in beer increased from 0.1
ppb N-nitrosodimethylamine to 0.4 ppb N-nitrosodimethylamine (p < 0.05) under simulated gastric...
Habitats for juvenile chinook salmon (Oncorhynchus tshawytscha) were
observed at a high flow during the spring of 1989 and at a low flow during the
spring of 1991 in the lower American River of California. Parameters of
microhabitats in eight macrohabitats were measured. Mean column water velocity
and total water...
Two sets of experiments measured changes in the oxygen consumption of the euryhaline teleost Oreochromis niloticus during acclimation to progressively increased salinity. Six acrylic respirometers were constructed for this purpose. The salinities tested were 9, 18, 27 and 36 ppt, with 36 ppt considered as full strength seawater. Fish were...
Fire suppression in high-elevation sagebrush steppe over the last century has
profoundly influenced the structure and complexity of vegetation communities.
Although fire is the primary management tool used to restore these areas, the impact
of this management practice on associated avian communities is poorly understood.
We examined patterns of habitat...
A recent development in drift-control for agricultural ground sprayers is the
installation of a hood (or shroud) over the boom. Hoods are designed to provide
a protected zone in which droplets can be sprayed and deposited on the target with
limited interference from the wind.
This study compared chemical drift...
In the current global economy, higher education is critical for gaining and keeping living-wage jobs. The need for a college-educated labor force has increased interest among youth in pursuing higher education (National Center for Education Statistics, 2013). Despite these demands, the United States has struggled to effectively increase college completion...
Pygmy rabbits (Brachylagus idahoensis) in Oregon and Washington are a sagebrush (Artemisia tridentata spp.) obligate species of concern because of declining populations and extirpation from much of their range. Efforts are underway to establish a captive bred population of the Columbia Basin pygmy rabbit in Washington state for reintroduction into...
Porapak Q, Chromosorb 102, and Tenax GC, three porous
polymers commonly used as adsorbents in headspace analyses were
investigated. The retention times of various low-boiling compounds
relative to water were measured on the collection columns to determine
which compounds would be lost during the water removal step
employed after sampling...
Natural and gabion modified habitats containing coho salmon
(Oncorhynchus kisutch) were observed and measured seasonally in East
Fork Lobster Creek, a fifth order stream in western Oregon. Coho
salmon usually inhabited backwater and secondary channel pools in
winter. Large wood debris complexes and undercut banks were the
primary sources of...
A dose related carcinogenic response was established for dimethylnitrosamine
administered in the diet of rainbow trout (Salmo gairdneri).
An equation was derived for the relationship between dose and hepatocellular
carcinoma incidence. From a published dose response study
using Porton rats as a test animal, a second equation was derived
for...
Little is known about Columbian black-tailed deer (Odocoileus hemionus columbianus) because of their elusive nature and the logistical difficulty of studying them in densely forested and mountainous terrain. The Oregon Department of Fish and Wildlife has identified fawn survival as an important gap in the current knowledge of demography and...
Individuals in their 20s today have more diverse experiences with school, work, and family transitions than previous cohorts. Contemporary young adults take longer to finish school, settle into marriages or partnerships, and begin parenting; they frequently change jobs or hold multiple part-time positions. Little is known about how young adults...
2, 4-Decadienal was autoxidized by subjecting a purified sample to an atmosphere of pure oxygen for 14 hours. A qualitative analysis of the autoxidative degradation products was made utilizing tandem gas chromatography and mass spectrometry. Additional information was obtained from the determination of the melting point of the DNP-hydrazone derivative...
A rapid gas liquid chromatographic method was adapted to processed
Dungeness crab for the determination of basic and neutral
volatiles. Methylamine, dimethylamine, and trimethylamine were
measured in processed Dungeness crab for the first time. Generally,
the range for trimethylamine was 42 ppm for frozen crab to 700 ppm
for iced...
The concept of the "new father" has been discussed in the literature and popular
media for over 25 years. Yet current studies regarding father involvement continue to show that fathers do not contribute equally to childcare and domestic labor, even among parents in dual-income families. Furthermore, as roles within families...
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RichardA. Settersten, Jr.
The concept of the “new father” has been discussed in the
Rainbow trout (Salmo gairdneri) and bluegill (Lepomis macrochirus)
were exposed to flows of water containing low DO concentrations
produced by bubbling nitrogen through the water. Abrupt exposure of
fish to critical DO concentrations (The standard dose response) and by
a more gradual changing of DO levels (The "stepdown" approach) were...
Habitat loss causes a reduction in available resources for wildlife, alters the configuration of remaining habitat, and may isolate wildlife populations. White-breasted nuthatches (Sitta carolinensis) are experiencing long-term population declines in the Willamette Valley of Oregon, where they are historically associated with oak woodlands. As secondary cavity-nesters, white-breasted nuthatches may...
Changes in the Oregon salmon, crab and shrimp fisheries were
documented from 1967 to 1980. The related socio-economic conditions in
fishing communities were described. Trends indicated that the overall
importance of fisheries to port communities has declined and ports are
not planning for an increase in the fishing industry. Chinook...
Dimethylamine (DMA), in addition to the alkaloids hordenine
and gramine, has been suggested as a potential precursor of nitrosodimethylamine
(NDMA) in malt. Analytical procedures were adopted
and applied to extract and quantify DMA from malt, green malt,
malt roots and raw barley. Ground malt was extracted at room
temperature with...
The Van Dyke's salamander (Plethodon vandyke,) is a rare species endemic to Washington State. It has been found in cool moist microhabitats along streams, splash zones of waterfalls, and headwater seeps. We explored the association of the Van Dyke's salamander with hydrologic condition, geomorphology, disturbance characteristics, and vegetation structure in...
Using data from the National Institute of Child Health and Human Development’s Study of Early Child Care and Youth Development (SECCYD), this study assessed the implications of the division of labor on relationship intimacy for married and cohabitating dual-earner couples (N= 392 couples). The study focused on what mothers and...
Selected life history aspects of American shad, Alosa
sapidissima, collected in Lake Umatilla of the Columbia River
during 1980 and 1981 were examined and compared to other shad
populations. Mean fork lengths of adult shad captured in
1981 were 405-, 415- and 423-mm for age III, IV and V males;...
Total copper concentrations of 10 [mu]g/l to 100 [mu]g/l appeared to
alter the predator-prey interactions of fathead minnows (Pimephales
promelas) and Daphnia pulex. The effect of copper concentration on
the total amounts of D. pulex consumed over a 12-h period varied with
the density of prey stocked hourly in the...
The purpose of this study was to characterize the nonvolatile,
water soluble, bis(hydroxyalkyl)N-nitrosamines produced from the
reaction of spermidine and nitrite.
The biologically occurring polyamine spermidine was reacted
with nitrite in the presence of acid. The reaction products were
isolated and converted to trimethylsilyl (TMS) derivatives. The
derivatized products were...
The osmoregulatory capabilities and tolerance of Kelp greenling, Hexagrammos decagramrnus, were studied in a series of seven salinities ranging from fresh water to concentrated sea water of 50 ppt. Results indicated that they were tolerant over a wide range of salinities but were incapable of surviving below 5 ppt and...
Driven by the need for high energy-density power sources, demand has
stimulated the development of small-scale engines. A small-scale engine
with a fuel supply could replace batteries and utilize higher energy-density
liquid hydrocarbon fuels; such an advance could deliver a new age of
portable devices. Currently, operable small-scale engines exist;...
A microchannel heat exchanger was designed for diesel waste heat recovery and its performance was evaluated. The 21x15x8 cm unit was constructed from diffusion brazed stainless steel lamina and weighed 11 kg. Operating from a 13.4 kW generator with an exhaust temperature of 500 °C the unit delivered 11.1 kW...
Delta-Sigma Modulator-based Analog-to-Digital converter design is an active area of research. New topologies require extensive simulations to verify their performance. A series of improvements were made to an existing circuit simulation package in order to speed the simulation process for the designer. Various examples of these improvements are presented in...
Recent demographic studies have revealed a greater diversity in settlement patterns among Mexican immigrant families resulting in rapidly climbing populations of immigrants in new areas of the country, particularly in rural areas, while growth in established destinations has slowed. Host communities play an important role in families' acculturation processes and...
In the Pajaro Valley near Watsonville, California,
twospotted spider mite (Tetranychus urticae Koch)
populations were surveyed in 1983 and '84 to detect the
influence of immigrants from nursery plants or
surrounding vegetation on subsequent resistance
development to cyhexatin and formetanate in strawberry
fields. Susceptible mites (cyhexatin LC50 = 0.0039 %...
The performance of a combined Stirling-ORC power cycle is evaluated, and an integrated microchannel heat exchanger is designed as an annular cold-side heat rejector for a free piston Stirling engine. Reasonable designs for a combined cycle can increased power output efficiency by 3 - 9% compared to that of a...
Rising energy demands and the continual push to find more energy efficient technologies have been the impetus for the investigation of waste heat recovery techniques. Diesel engine exhaust heat utilization has the potential to significantly reduce the consumption of fossil fuels and reduce the release of greenhouse gases, because diesel...