Hot water discharges and potential chemical spills are factors that threaten water quality in cooling reservoirs of chemical and power plants. In this thesis, three models are used to analyze the impact of these factors in a particular case study.

This study investigated person-situation relations of professional preparation and job classification of secondary school athletic training positions with core job dimensions and affective outcomes within Hackman and Oldham's 1980 Job Characteristics Model. Research focused on which relations show increased affective outcomes; relationships between core job dimensions and affective outcomes; and characteristics of the core job dimensions of task identification, task significance, and skill variety of athletic trainer tasks as defined by the National Athletic Trainers Association Board of Certification, Inc. 1995 Role Delineation Study.

Using the "revealed operant" technique, variability during acquisition and extinction was examined with measures of response rate and a detailed analysis of response topography. During acquisition, subjects learned to emit four response patterns. A continuous schedule of reinforcement (CRF) for 100 repetitions was used for each pattern and a 30 min extinction phase immediately followed. One group of subjects learned the response patterns via a "trial-and-error" method. This resulted in a wide range of variability during acquisition and extinction. Only one subject emitted a substantial amount of resurgent behavior. A second group of subjects was given instructions on what keys to press to earn reinforcers. This group had less variability in acquisition and extinction and resurgent responding was prevalent.

This study used the Health Belief Model to examine the predictors of AIDS preventive behavior. The independent variables were the variables of individual perception, modifying factors (psychological variables), and likelihood variables. The respondents, the Taiwanese students of the University of North Texas, were influenced both by Chinese sexuality and Western values in their AIDS-risk behavior. The results revealed that 90% of the respondents were misinformed on the availability of AIDS vaccine. In addition, a majority of the students were either abstaining from sex or practicing monogamy. Using Pearson's correlation coefficient and multiple regression analysis, this study found that the psychological variables rather than cognitive variables significantly influenced the respondents' AIDS preventive behavior. Finally, suggestions were made for future research on AIDS, and for AIDS preventive behavior campaigns.

The purpose of this study was to investigate the effects of four learning styles (accommodator, assimilator, converger, and diverger) and two different presentation methods (traditional and computer-based) on knowledge acquisition in a university classroom.

The purpose of this study was to examine curricular programs in private, public choice, and public attendance-zone schools to determine whether differences exist among curricular programs in the three types of schools. The findings from the student survey data indicated that private school students reported their curriculum to be more challenging than public school students, but no other significant differences were noted. Findings from the teacher survey showed more positive results for private schools in indicators of a challenging curriculum, expectations of students, school climate, and external support than public schools. This study showed that of the types of schools examined, Catholic schools exhibited the most consistent and well written curriculum that reflected the four research questions. Future research needs to be done to establish whether these indicators of a challenging curriculum result in higher student achievement.

This study investigated whether a computer-administered mathematics test can provide equivalent results for normal and mathematically disabled students while retaining similar psychometric characteristics of an equivalent paper and pencil version of the test. The overall purpose of the study was twofold. First, the viability of using computer administered assessment with elementary school children was examined. Second, by investigating items on the computer administered mathematics test for potential bias between normally achieving and mathematically disabled populations, it was possible to determine whether certain mathematical concepts consistently distinguish between the two ability groups.

This study determined whether an association exists between the perception of western wear status symbols and demographic characteristics {i.e., gender, age, income, and education level) among Texas American Paint Horse Association members.

Over the past three to four decades the community college has experienced some tremendous periods of growth and success. Much of this has been due to a growing economy and a growing population. However, the future of the community college may be in for some changes. The effects these changes are having can mean opportunity or disaster depending on the readiness of the institution. The change occurring today requires future insight, swifter action, and a proactive response. Community colleges cannot afford to leave planning for crisis situations. A proactive stance must be taken and tough questions must be asked. In 1991 the Seventy-second Texas Legislature tasked the Legislative Budget Board of Texas with the assignment of developing a long-range strategic plan for state government based on individual agency plans. The passing of House Bill No. 2009 required that all agencies of Texas State Government, including community colleges, develop a strategic plan. The purpose of this study was to determine the significance of certain independent variables towards the perceived importance of three dependent variables - statements of purpose, statements of direction and statements of impact - found in the Legislative Budget Board Strategic Planning Template. Research shows that there are a …

The study determined the overall persistence rate of first-time full-time entrants into a mid-sized private university during the fall semesters 1989 to 1991 to the 2nd year (1990 to 1992). The study compared the retention rate of recipients and nonrecipients of a variety of financial aid programs. Included is a comparison of groups receiving various types of financial assistance and whether or not there are differences between the groups with respect to types of assistance, gender, ethnicity (African American, Hispanic, Anglo), high school grade point average, and national test scores (SAT, ACT). The types of assistance studied were categorized by academic scholarships, university-operated student employment, need-based grants, activity awards, entitlements, and loans. The question of whether renewal, elimination, or reduction in assistance relates to retention was also studied.

With the advent of the 21st century, technological innovations are transforming the face of education and the school library media center. One of these significant developments is the ability to communicate through the Internet. The purpose of this study is to examine the perceptions of Texas public school library media specialists who are active Internet users about their utilization of the Internet, and how their efforts in implementing and supervising Internet access in their school library media centers impact the Texas public schools that they serve. A survey instrument of Likert items was developed that queried these public school library media specialists for their perceptions of Internet use in their schools. MANOVA was the chosen statistical measure for this study. An initial electronic mail-out to 1,232 Texas public school library media specialists (K-12) with Internet addresses were contacted to participate in this study. After a time frame of one month, 196 Texas school library media specialists e-mailed the researcher, confirming their willingness to be a survey participant. All respondents to this e-mail request participated in this study, and a second U.S. mail-out was sent containing the actual survey instrument. The researcher found that the use of the Internet by school …

The purposes of this study were to (1) identify the recommendations of Curriculum Management Audits conducted in Texas Public School systems, (2) determine the degree to which each of the recommendations had been implemented, and (3) determine the perceptions of stakeholders as to the factors instrumental in the real and potential impact of the audit. The researcher conducted interviews with superintendents and key central office administrators with a working knowledge of the audit report in each of the eleven Texas school districts studied. Respondents were asked to rate recommendations written for their districts using the following descriptors: Implemented, In Progress, Plan to Implement, Recommendation Modified, No Implementation. The ranking of recommendation implementation revealed that 85% of the recommendations made in the 11 audit reports reviewed in this study had received action toward implementation to some degree. Respondents were also asked to cite factors which facilitated or impeded recommendation implementation. Significant factors facilitating the implementation of recommendations were reported to be time, organizational structure/personnel and planning. The analysis of the collective recommendations revealed that school board policies were not adequate to direct the design, delivery and monitoring of curriculum when measured against audit Standard One criteria. School districts in Texas rely …

The need for a high-quality workforce to meet increased competition in the world economy has increased the need for competent vocational administrators in public 2-year postsecondary institutions. Researchers have agreed that vocational education is in a state of metamorphosis and must change to meet its challenges in the coming century. At the same time, more women are seeking and obtaining vocational administrative positions. Several studies have been done to identify the competencies needed by vocational administrators to perform their duties, but there has been little research on the actual ability to perform the administrative tasks identified by these studies. Two main purposes of this study are: (a) to determine the perceived level of administrative competencies possessed by women administrators in vocational education at the community college level in Texas; (b) to determine the adequacy of the preservice training received by these administrators to perform their administrative functions. Of the 175 women administrators randomly selected to participate in the study, 71% completed the Administrator Task Inventory. In addition to the descriptive statistics, two multiple regression analyses were tested. First, principal component analysis was used to reduce the number of dependent variables from 11 to 2, after which two multiple regression analyses …

This study analyzed the effect of technology integration education on teachers' and students' attitudes toward information technology. Two instruments measuring similar attributes were used to assess teachers' and students' attitudes. Differences in pre- and post-test scores were used to determine changes that occurred during the course of the study.

The role of point loss for symmetrical relations introduced simultaneously with probe trials in the absence of original relations on all probe trial performances was evaluated. Training was completed after six conditional discriminations were established in two contexts. Point loss was introduced simultaneously with probe trials in the absence of original relations in the first context. Probe trials with no point loss in the absence of original relations were introduced in the second context. The simultaneous introduction of probe trials and the point loss contingency may in some cases prevent the emergence of an equivalence class in the context that contained the point loss as well as in the context where no point loss occurred.

This study focused on the televisual and cultural practices of Iranians via public access television in Dallas, Texas. It includes analysis of format and content. It combines demographic, structural, and statistical information with a culturalist and interpretive viewpoint in examining the efforts of Iranians, via access television programs, in preserving their culture and the formation of a coherent and active community in the Dallas/Fort Worth Metroplex.

The objectives of this project were to measure changes in frequency of occurrence of submerged macrophytes over the first two growing seasons following stocking with triploid grass carp at two fish per acre and to measure differences in macrophyte biomass between areas excluded from herbivory and adjacent control sites after 16 months following establishment of exclosures. The project also seeks to measure concentrations of fluridone following the herbicide treatment, and to compare two methods of aquatic vegetation sampling.

This research expands on recent sociological studies which maintain that environmental contaminants in America are disproportionately placed in neighborhoods inhabited by minorities and the poor. Prior studies have focused on the predictor variables which identify areas of contamination near residential neighborhoods, yet fail to explore the socio-political and historical factors which contribute to these phenomena. The Environmental Protection Agency's Toxic Release Inventory 1990 database, the Texas Natural Resource Conservation Commission's Annual Report of the Hazardous and Solid Waste Program for 1992, and the U.S. Census Bureau's 1990 Census Data for Dallas County were utilized in pinpointing industries violating toxic release standards. Socio-historical data was obtained from government and historical records and reports, books, and newspaper clippings on Dallas County. Maps and data were obtained from the North Central Texas Council of Governments, and the cities of Dallas and Garland. Chapter I discusses the synergetic forces of capitalism, urban growth, uneven development, and settlement patterns resulting in the distribution of environmental contaminants. Chapter II reviews the literature and presents evidence that race and class are strong predictors of where environmental contaminants are located. Chapter III outlines the data and methods employed. Chapter IV traces the historical development of Dallas County. Chapter …

Biological diversity is a key component in assessing ecosystem health. Alteration, degradation and loss of habitat due to human influence is currently the primary stressor resulting in decreases in diversity. Reliable assessment of large areas in terms of biological integrity are needed for conservation and preservation efforts. Remotely sensed data provide an integrated view of reflected electromagnetic energy over large areas of the earth. These energy patterns provide unique spectral signatures which can be correlated to land cover and habitat. This research sought relationships between traditional ecological measures and information gathered from satellite digital imagery. Reliable interpretation of earth surface characteristics relies largely on accurate rectification to a map projection and subsequent thematic classification. Use of the Global Positioning System (GPS) for rectification was superior than digitizing topographical maps. Differentially corrected GPS locations provided optimum rectification with SPOT satellite imagery while marginally better rectifications were obtained for Landsat MSS imagery using uncorrected GPS positions. SPOT imagery provided more accurate land cover classifications than did MSS. Detection of temporal land cover change using MSS imagery was hampered by confusion among intermediate successional classes. Confusion between upland and bottomland forest classes occurred with both SPOT and MSS. Landscape analyses using thematic maps …

Humans are very effective at evaluating information visually. Scientific visualization is concerned with the process of presenting complex data in visual form to exploit this capability. A large array of tools is currently available for visual presentation. This research attempts to evaluate the effectiveness of three different presentation models that could be used for scientific visualization. The presentation models studied were, two-dimensional perspective rendering, field sequential stereoscopic three dimensional rendering and immersive virtual reality rendering. A large section of a three dimensional sub surface seismic survey was modeled as four-dimensional data by including a value for seismic reflectivity at each point in the survey. An artificial structure was randomly inserted into this data model and subjects were asked to locate and identify the structures. A group of seventeen volunteers from the University of Houston student body served as subjects for the study. Detection time, discrimination time and discrimination accuracy were recorded. The results showed large inter subject variation in presentation model preference. In addition the data suggest a possible gender effect. Female subjects had better overall performance on the task as well as better task acquisition.

An examination of the characteristics of Texas middle schools has been conducted with the objective of developing a planning tool for middle staffs. This success is measured by the Academic Excellence Indicator System (AEIS), whose rating scale has three components: campus scores on the Texas Assessment of Basic Skills (TAAS), campus attendance percentages, and campus dropout rates. TAAS scores and attendance rates have been the focus of this study. Two years of data were examined separately for research question. Principal component analysis reduced the number of indicators in both years' data to 20 factors/ Each of these factors received a designated based on the characteristics that the component indicators had in common. A multiple regression analysis was performed on these factors to determine the influence each had on the campus TAAS scores and attendance. The unpredictability of human subjects requires an additional step in this study to achieve valid conclusions. A comparison of the two years' results is made to discover attendance, gifted and talented programs, and teacher gender were the strongest overall positive influences on student achievement. Campus demographics, retention, and ESL/bilingual programs have the strongest association with low student achievement.

This was a qualitative study designed to document the historical process which brought about a performance-centered accountability (or results-based) system in educator preparation in Texas as reflected in the documents of the first 17 institutions approved under the new approval process for educator preparation. The study will also serve as a historical record which used the change process in political systems to analyze the adoption of the Accountability System for Educator Preparation (ASEP). Additionally, the study provided a thorough review of the literature on Michael Fullan's Change Process Model and David Easton's Political Systems Model.

This study traced the development of the Equity 2000 Program in the Fort Worth Independent School District from its inception in 1990 to its sixth and final year as an exemplary program for equal access to higher education for minority and underserved youth. Program components included mathematics, counseling, staff development, academic enrichment activities, parent education and higher education linkages. Both primary and secondary sources were evaluated from the perspectives of internal and external criticism. The following conclusions were reached: 1) District policy must change if minority students are going to access algebra and geometry. 2) The lack of involvement of other curriculum areas created primarily a mathematics inservice program. 3) Required inservice was necessary to provide improved and more effective campus and district results. 4) The precollege guidance and counseling component needed integration with the mathematics component. 5) Lack of principals' involvement in the early development of the program contributed to uneven administrative support. 6) There was no definitive strategy for parental inclusion. 7) Funding sources were inadequate to fully implement all parts of the program. 8) There was limited participation of local institutions of higher education. 9) There was a lack of an ongoing, structured evaluation process to document …

The Personality Inventory for Youth (PIY) is a recently developed, multiscale assessment instrument designed specifically for adolescents between the ages of nine and 18. The purpose of this archival study was to establish clinical correlates for the PIY scales. PIY profiles were collected from 100 juvenile files at the Gainesville State School and examined in conjunction with the Child Assessment Scale (CAS) and the Personal Attitude Scale (PAS) to provide evidence of convergent and discriminant validity. Results indicate modest to moderate convergent validity according to Campbell and Fiske's criteria for construct validity; however, discriminant results indicate considerable overlap among traits which are not expected to be highly correlated.