The purpose of this study was to: (a) develop a comprehensive plan consisting of a series of logical steps based upon recommendations derived from psychometric, measurement, and research literature and utilize the plan to develop a Likert-type scale to provide valid and reliable measures of the attitude of preservice and inservice elementary school teachers toward computers; (b) administer the developed scale to selected preservice elementary school teachers; and (c) investigate relationships between attitude toward computers and selected teacher variables. The comprehensive plan consisted of the following steps: (a) develop theory of construction, (b) establish conceptual framework, (c) create item pool, (d) develop trial scale, (e) administer trial scale, (1) conduct item analysis, (g) select items, (h) construct final scale, (i) test for homogeneity, (j) determine reliability, (k) test for unidimensionality, (l) administer final scale, and (m) infer validity. The plan was utilized to develop the Evans Scale for Computer Attitude (ESCA). Validity was inferred utilizing construct-related evidence, which included the manner in which the scale was developed, studies of scale internal structure, prediction and conformation of a general factor, replication of factor structure, relationship of scale scores to nontest variables, relationship of scale scores to similar and dissimilar constructs, comparison of scores with experimental intervention, comparison of known-group responses. An alpha reliability coefficient was found to be 0.96 on two occasions. It was concluded that: (a) the ESCA provided valid and reliable measures of the computer attitude of preservice and inservice teachers at the elementary school level, (b) the comprehensive plan was effective for the development of a Likert-type scale for measuring the attitude toward computers of preservice and inservice teachers at the elementary school level, (c) preservice teachers in the Masters of Arts in Teaching Program (MAT) in Elementary Education at Oregon State University as a group had positive attitude toward computers, and (c) computer attitude of elementary MAT preservice teachers was significantly related in a positive direction with computer experience and in a negative direction with age. / Graduation date: 1995

Riparian zones provide habitat for breeding birds in the semiarid western United States; however, there are few data available that address the effects of livestock grazing strategies on riparian habitats and avian communities. Documenting avian community composition in different riparian vegetation communities and relating vegetation communities to livestock grazing strategies may identify management alternatives that are sustainable from a wildlife habitat perspective, and may permit constructive coalitions between agricultural industry and environmental groups. I compared diurnal breeding bird abundance, individual species abundance, and species richness, and vegetation composition and structure among 12 streamside riparian areas of Bear and Silvies valleys in eastern Oregon during 1993 and 1994. Bird and vegetation data were collected along four replicate transects within each of three riparian vegetation communities characterized by vegetation structure: herbaceous, discontinuous willow (Salix spp.), and continuous willow. These riparian vegetation communities were grazed under summer season-long, summer short-duration, and fall short-duration livestock grazing strategies, respectively, >5 years before the study. Differences in riparian vegetation among communities were primarily related to shrub structure by experimental design. The continuous willow community had more shrub cover overall (P<0.001) and within each 1-m height interval from 0-4 m (P<0.013) than the herbaceous and discontinuous willow communities. The herbaceous community had no shrub cover >1 m in height. Willows extended farther (P=0.031) from the steam edge in the continuous willow community than in the discontinuous willow community. No willows were detected in the herbaceous community. I detected 4,016 birds representing 56 species along the transects. Total bird abundance was greater (P<0.001) in the continuous willow community than in the herbaceous and discontinuous willow communities. Species richness was inconsistent (P=0.034) between years within communities; it was greatest (P<0.037) in the continuous and discontinuous willow communities in 1993, and greatest (P<0.003) in the continuous willow community in 1994. Total bird abundance and species richness in 1994 increased with willow volume (r��>0.707, P<0.001). Of 23 bird species with >20 individual detections over both years, 13 species were most abundant in one or two vegetation communities (P<0.088). Seven species (yellow warbler [Dendroica petechia], song sparrow [Melospiza melodia], willow flycatcher [Empidonax traillii], American robin [Turdus migratorius], common snipe [Gallinago gallinago], bobolink [Dolichonyx oryzivorus], and Vaux's swift [Chaetura vauxi]) were most abundant in the continuous willow community. Three species (savannah sparrow [Passerculus sandwichensis], black tern [Chlidonias niger], and American wigeon [Anas americana]) were most abundant in the herbaceous community. Willets (Catoptrophorus semipalmatus) were most abundant in the herbaceous and discontinuous willow communities whereas cinnamon teal (A. cyanoptera) were most abundant in the herbaceous and continuous willow communities. Red-winged blackbirds (Ageliaus phoeniceus) were inconsistent (P=0.032) between years within communities: they were most abundant in the continuous willow community in 1993, and most abundant in the continuous willow and herbaceous communities in 1994. Hydrophytic woody vegetation within semiarid rangeland environments increases structural complexity and is associated with avian abundance and diversity. Yellow warblers, willow flycatchers, and song sparrows, which depend on hydrophytic shrubs for nesting almost exclusively in the semiarid West, are especially threatened by the elimination or simplification of woody riparian vegetation. I suggest that riparian vegetation structure and composition, which is associated with avian abundance, species richness, riparian associate bird species, and landscape-level biological diversity, be maintained where possible. Seasonal light (<30% use) fall short-duration grazing seemed to be compatible with the maintenance of woody riparian vegetation whereas summer season-long and summer short-duration grazing is likely incompatible. / Graduation date: 1995

The purpose of this study was to investigate the effect of untrained and trained peer tutors on the motor performance of students with developmental disabilities in integrated physical education classes. This study utilized a single subject delayed multiple baseline design across subjects. Six elementary age students with developmental disabilities and six nondisabled peer tutors participated in the study. The students were videotaped during their physical education class and data were analyzed on discrete motor skill responses. The students were assigned to one of two protocols. Protocol 1 consisted of three conditions; baseline, assistance by an untrained peer tutor, and assistance by a trained peer tutor. The results of Protocol 1 data revealed that trained peer tutors were effective at assisting subjects with developmental disabilities improve their motor performance, while untrained peer tutors were not. As a result of these findings Protocol 2 which consisted only of baseline and assistance by trained peer tutors, was utilized to replicate and provide additional support for the effect of trained peer tutors. The results of Protocol 2 revealed that trained peer tutors were effective at assisting subjects with developmental disabilities improve their motor performance in integrated physical education classes. Trained peer tutors were provided with instruction in the following three teaching areas: cueing, feedback, and reinforcement. The cueing techniques followed the system of least prompts and included verbal cueing, modeling, and physical assistance. Feedback information consisted of positive general and positive specific reinforcement. Peer tutors were trained over two 30 minute sessions. Pre-established criteria required the peer tutors to implement the teaching behaviors with the researcher a minimum of 4 out 5 times, and receive a score of 90% or better on the peer tutor quiz. All peers were successful at meeting this criteria. Data were collected on the tutors' teaching behaviors throughout the study via a wireless microphone. The results of the peer tutor data revealed that the tutors were able to implement the tutor training program. The results of this study demonstrate that elementary age peer tutors can be trained to provide assistance to students with developmental disabilities in integrated physical education classes. Recommendations for future research are provided based on the results of this study. / Graduation date: 1994

'Golden Delicious' winter squash (GDWS), Cucurbita maxima Duchesne, provides significant amounts of pollen (24 mg) and nectar (236 μl), but with a low reward of 14% nectar sugar. The quantity of nectar produced per GDWS flower differed between sites and floral sex. The GDWS male flowers had 25% higher sugar concentration than female flowers. There was no statistical difference in the percent of nectar sugars per flower between sites, but the interaction between site and floral sex was statistically significant for the amount of nectar and percent of nectar sugars. Pollen production per flower differed significantly between sites with the most productive site producing 27% more, and 45% more than the other sites. Pollination efficiency of honeybees and bumble bees was assessed with field cages (1.8x1.8x1.8 m). No significant differences were found except for the interaction between the bee treatment and year on number of fruit per cage. This significant difference reflects the increase in fruit number produced by honey bees in 1997. The effect of distance from honey bee hives on fruit and seed quality was tested, and found significant only for B- and C-seeds weight, which were both less in the plots farthest from the nearest group of honey bee hives. Placement of honey bee hives in fields of ≤120 ha appears not to be critical for adequate pollination of GDWS. Other pollinators (excluding honey bees) were frequent visitors to the squash flowers studied here - for example, Bombus spp., Megachilids, Halictids, etc. These other pollinators, mostly bumble bees, accounted for 3.55% of all bee visits. Honey bees visited proportionately more female flowers in the morning, and progressively switched to the more abundant male flowers in the afternoon. This bias differed by site and year. Bumble bees visited proportionally slightly more male GDWS flowers than did female flowers and did it in a similar rate throughout the day. From 15 minute observations each hour of individual female GDWS flower, we calculated that they received approximately 80 honey bee visits per day. / Graduation date: 2001

Soil column studies were performed on a chromium contaminated soil from the United Chrome Products Superfund Site currently undergoing a pump-and-treat cleanup process. The goal of the research was to provide insight into the feasibility of chemically changing the injection fluid of the pump-and-treat system to enhance hexavalent chromium (Cr(VI)) mobility. The parameters tested were pH, ionic strength, and competitive anion type and concentration. Ionic strength effects were investigated by adjusting the NaCl concentration of the extracting solution and by observing the influence of varying anion concentrations on desorption (bicarbonate, sulfate, and phosphate). The results indicated that high ionic strength solutions slow the rate of Cr(VI) desorption. This possibly indicates most of the Cr(VI) was in pore water solution and was adsorbing, slowing the removal process. Cr(VI) desorption was fastest for distilled water solution followed by competitive anion/distilled water solutions. The high ionic strength extracting solutions, 0.05 M and 0.10 M NaCl, had the slowest Cr(VI) desorption rates. Effluent pHs dropped as the ionic strength was increased (increasing NaCl concentrations) which was attributed to a Na-H exchange. Increased concentrations of bicarbonate, sulfate, and phosphate resulted in only small pH differences in the effluent of less than 0.5 pH units. The effect of pH was investigated by varying the pH of the 0.01 M NaCl solution with strong acid and base and by varying the pH of phosphate competitive anion solutions. The effects of changing 0.01 M NaCl solution pH were inconclusive. Differences between Cr(VI) desorption rates for the soil columns with adjusted influent pHs were small. Cr(VI) desorption curves and column effluent pH values for phosphate solutions of varying influent pH values were nearly identical, indicating that soil buffering and effluent pH are more important factors than influent pH in achieving Cr(VI) desorption. Nitrate, bicarbonate, sulfate, and phosphate were investigated to determine the effect of various competitive anions on Cr(VI) desorption. The effectiveness of each anion at extracting Cr(VI) from soil appeared to follow the order of adsorption affinity to the soil. / Graduation date: 1992

Graduation date: 1993

The purposes of this study were: 1) to review the land use history of Oak Creek watershed since European settlement. And 2) to consider the human-caused impacts and their effects associated with different land uses. The study area was classified into three land use patterns: residential, agricultural, and forested areas. Since the European settlement in the mid 1840's, the Oak Creek watershed has experienced changes of land use simultaneous with the development of the city of Corvallis and its vicinity. Associated with this, different impacts have occurred on riparian areas. By and large, these impacts were inherent to each land use. / Graduation date: 1993

Microhabitat use by adult speckled dace (Rhinichthys osculus), adult longnose dace (R. cataractae), and juvenile dace (R. spp.) was investigated during the summer of 1992 in an Oregon Cascades stream. Selected areas were snorkeled day and night in order to evaluate differential use of habitat resources both temporally and spatially. Speckled dace were active both day and night but longnose dace were only observed at night when they were found primarily in fast flowing midstream areas. Small speckled dace (<8 cm TL) shifted from relatively fast flowing midstream daytime habitats to slower inshore areas at night. Large speckled dace (8-14 cm TL) used slower areas during the day and faster water at night. Potential competition between large speckled dace and longnose dace (8-20 cm TL) at night may be deflected by spatial microhabitat segregation. Within the fast water habitat at night, longnose dace used the fastest, shallowest areas with large substrates and were usually on the bottom. Large speckled dace used relatively slower, deeper water with smaller substrates and were near, but not on, the bottom. / Graduation date: 1994

Every year, the United States produces at least 236 million metric tons of hazardous waste. Hazardous waste is defined as solid waste that can pose a substantial threat to human health and the environment when disposed of incorrectly. Some commonly used household products, when disposed of, become hazardous waste; historically, much of this household hazardous waste (HHW) has been disposed of into systems not designed to safely handle hazardous waste. One solution to this disposal problem is providing safe disposal systems for household hazardous waste in the community. The purpose of this study was to survey the population of Benton County, OR to assess the residents' HHW disposal practices, attitudes and beliefs about HHW as an environmental health risk, and preferences for a safe disposal system. Benton County residents' awareness of the current community program for recycling used household items was also investigated. This study indicated that incorrect disposal methods were used by the majority of subjects for almost all HHW surveyed, and that for nonautomotive HHW, landfilling was the most common means of disposal. The majority of subjects in this study disposed of used motor oil and lead-acid batteries by recycling these HHW. A permanent collection site for HHW disposal was the preferred disposal option for 62% of subjects, and 100% of those subjects choosing this option said they would drive up to 5 miles to use this facility. This study indicates that the largest number of subjects preferred the option of paying a user fee for HHW disposal as a means of funding a HHW disposal system. Three-fourths of the subjects reported a high or moderate amount of concern about the contribution of HHW to pollution of surface and groundwater, and 68% of the subjects stated that they lacked confidence in the landfill to safely contain chemical wastes. Approximately one-half of the subjects recalled reading or hearing about HHW disposal in the past year, and 62% of the subjects stated that they would call their garbage disposal company for HHW disposal information. The results of this study indicate that 90% of the Benton County residents surveyed were aware of their curbside recycling program. This study suggests that Benton County residents are concerned about the possible adverse environmental health effects of incorrect HHW disposal, and supports a permanent collection site for the safe disposal of HHW, as well as increased public education, as means of reducing the risks to human health and the environment caused by incorrect HHW disposal. / Graduation date: 1992

The purpose of this study was to explore and describe the nature of local school-community human service agency collaboration undertaken to address the needs of at-risk youth. The study focused on the experience of four youth services teams in two Oregon counties. A qualitative, multiple-case study approach was used as the research design. Inquiry was guided by four questions: 1) Why and how was the collaboration initiated?, 2) What is the structure of the collaboration?, 3) What are the characteristics of the process?, and 4) What are the outcomes of the process? Data were collected through interviewing, observation, and document review. The analysis of the data proceeded inductively using a content analysis strategy. Based on a preponderance of evidence, conclusions were drawn. They included: 1. Collaboration became a viable response strategy when organizations realized that unilateral solutions were ineffective. 2. Organizational support for collaboration at. both the administrative and staff level was important. 3. The conveners of the collaboration exercised informal rather than formal authority. 4. In-kind contributions of a limited nature constituted the resource base of the collaboration. 5. Attention was paid to facilitating the process of collaboration itself. 6. Leadership of the collaboration rested primarily with the education sector. 7. While the broad vision of the collaboration was embraced by all members, at a more personal level the vision was translated into differing objectives. 8. Both direct and indirect benefits sustained members' commitment to the collaboration. 9. Generally, parent involvement was felt to be integral to the success of the collaborative effort. 10. The issue of confidentiality was addressed. 11. Collaboration resulted in improved communication among schools and agencies, but the increased understanding was largely confined to team members. 12. Collaboration appeared to facilitate access to services and service delivery for some at-risk students; however, limited documentation made it difficult to assess the team's impact on student outcomes. / Graduation date: 1993