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Enhancing the use of coals by gas reburning-sorbent injection
The objective of this project is to evaluate and demonstrate a cost effective emission control technology for acid rain precursors, oxides of nitrogen (NO{sub x}) and sulfur (SO{sub x}), on three coal fired utility boilers in Illinois. The units selected are representative of pre-NSPS design practices; tangential, wall, and cyclone fired. The specific objectives are to demonstrate reductions of 60 percent in NO{sub x} and 50 percent in SO{sub x} emissions, by a combination of two developed technologies, gas reburning (GR) and sorbent injection (SI). With GR, about 80--85 percent of the coal fuel is fired in the primary combustion zone. The balance of the fuel is added downstream as natural gas to create a slightly fuel rich environment in which NO{sub x} is converted to N{sub 2}. The combustion process is completed by overfire air addition. SO{sub x} emissions are reduced by injecting dry sorbents (usually calcium based) into the upper furnace, at the superheater exit or into the ducting following the air heater. The sorbents trap SO{sub x} as solid sulfates and sulfites, which are collected in the particulate control device.
Date:
December 22, 1988
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Ecological Studies Related to Construction of the Defense Waste Processing Facility on the Savannah River Site
The Savannah River Ecology Laboratory has completed 10 years of ecological studies related to the construction of the Defense Waste Processing Facility (DWPF) on the Savannah River Site. This progress report examines water quality studies on streams peripheral to the DWPF construction site and examines the effectiveness of refuge ponds'' in ameliorating the effects of construction on local amphibians. Individual papers on these topics are indexed separately. 93 refs., 15 figs., 15 tabs. (MHB)
Date:
December 1, 1988
Creator:
Scott, David E.; Pechmann, Joesph H. K.; Knox, John N.; Estes, Ruth A.; McGregor, JoAnne H. & Bailey, K. (ed.)
Object Type:
Report
System:
The UNT Digital Library
Global distribution of total cloud cover and cloud type amounts over the ocean
This is the fourth of a series of atlases to result from a study of the global cloud distribution from ground-based observations. The first two atlases (NCAR/TN-201+STR and NCAR/TN-241+STR) described the frequency of occurrence of each cloud type and the co-occurrence of different types, but included no information about cloud amounts. The third atlas (NCAR/TN-273+STR) described, for the land areas of the earth, the average total cloud cover and the amounts of each cloud type, and their geographical, diurnal, seasonal, and interannual variations, as well as the average base heights of the low clouds. The present atlas does the same for the ocean areas of the earth.
Date:
December 1, 1988
Creator:
Warren, S.G.; Hahn, C.J.; London, J.; Chervin, R.M.; Jenne, R.L. (Washington Univ., Seattle, WA (USA). Dept. of Atmospheric Sciences; Colorado Univ., Boulder, CO (USA). Cooperative Inst. for Research in Environmental Sciences et al.
Object Type:
Report
System:
The UNT Digital Library
LIMB Demonstration Project Extension
The basic goal of the Limestone Injection Multistage Burner (LIMB) demonstration is to extend LIMB technology development to a full- scale application on a representative wall-fired utility boiler. The successful retrofit of LIMB to an existing boiler is expected to demonstrate that (a) reductions of 50 percent or greater in SO{sub x} and NO{sub x} emissions can be achieved at a fraction of the cost of add-on FGD systems, (b) boiler reliability, operability, and steam production can be maintained at levels existing prior to LIMB retrofit, and (c) technical difficulties attributable to LIMB operation, such as additional slagging and fouling, changes in ash disposal requirements, and an increased particulate load, can be resolved in a cost-effective manner. The primary fuel to be used will be an Ohio bituminous coal having a nominal sulfur content of 3 percent or greater.
Date:
December 15, 1988
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Stanford Geothermal Program, reservoir and injection technology
This annual report of the Stanford Geothermal Program presents major projects in reservoir and injection technology. The four include: (1) an application of the boundary element method to front tracking and pressure transient testing; (2) determination of fracture aperture, a multi-tracer approach; (3) an analysis of tracer and thermal transients during reinjection; and, (4) pressure transient modeling of a non-uniformly fractured reservoir. (BN)
Date:
December 1, 1988
Creator:
Horne, R.; Ramey, H.J. Jr.; Miller, F.G.; Brigham, W.E. & Kruger, P.
Object Type:
Report
System:
The UNT Digital Library
Conference on iterative methods for large linear systems
This conference is dedicated to providing an overview of the state of the art in the use of iterative methods for solving sparse linear systems with an eye to contributions of the past, present and future. The emphasis is on identifying current and future research directions in the mainstream of modern scientific computing. Recently, the use of iterative methods for solving linear systems has experienced a resurgence of activity as scientists attach extremely complicated three-dimensional problems using vector and parallel supercomputers. Many research advances in the development of iterative methods for high-speed computers over the past forty years are reviewed, as well as focusing on current research.
Date:
December 1, 1988
Creator:
Kincaid, D. R.
Object Type:
Article
System:
The UNT Digital Library
Geust Artist Recital: 1988-12-01 - Ricardo Cobo, classical guitar
Access:
Use of this item is restricted to the UNT Community
Guest guitar recital performed at the UNT College of Music Concert Hall.
Date:
December 1, 1988
Creator:
Cobo, Ricardo
Object Type:
Sound
System:
The UNT Digital Library
Guest Artist Recital: 1988-12-09 - Denton Community Orchestra
Access:
Use of this item is restricted to the UNT Community
Guest orchestra concert performed at the UNT College of Music Concert Hall.
Date:
December 9, 1988
Creator:
Denton Community Orchestra
Object Type:
Sound
System:
The UNT Digital Library
Empirical Research of Decision-making Effectiveness When Using Differing Presentation Formats Under Varying Decision Tasks
The purpose of this research was to determine if presentation format, given a particular task to be performed, would affect the decision-making process of financial decision makers. The problem motivating this study is the potential for managers to make inefficient decisions when they use reports which are presented inappropriately for a given task.
Date:
December 1988
Creator:
Hard, Nancy J. (Nancy Jean)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Students finish high school with college credit
Article by Kristi Burchfield in the Denton High School Newspaper, giving details about the newly established Texas Academy of Mathematics and Science at the University of North Texas.
Date:
December 9, 1988
Creator:
Burchfield, Kristi
Object Type:
Clipping
System:
The UNT Digital Library
[Memo from Rogers Redding, December 9, 1988]
Memo from Rogers Redding, on December 9, 1988. An announcement that the University of Central Florida is hiring a new Dean of the College of Arts and Sciences, and a letter from James R. Miller recommending Redding for the position, are included. A handwritten note on the first page reads: "Jim - Many Thanks! - Rog".
Date:
December 9, 1988
Creator:
Redding, Rogers W.
Object Type:
Letter
System:
The UNT Digital Library
[Letter to University Committee of the Faculty Senate, Alfred Hurley, and the Board of Regents of UNT, December 16, 1988]
Letter to the University Committee of the Faculty Senate, Chancellor Alfred F. Hurley, and the Board of Regents of the University of North Texas, on December 16, 1988, nominating Julian C. Stanley for an honorary doctorate.
Date:
December 16, 1988
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Conformation, Orientation and Interaction in Molecular Monolayers: A Surface Second Harmonic and Sum Frequency Generation Study
We have used sum frequency generation (SFG) to study the order in a silane monolayer before and after the deposition of a coadsorbed liquid crystal monolayer. We observe an increase in the order of the chain of the silane molecule induced by the interpenetration of the liquid crystal molecules. By using second harmonic generation (SHG) and SFG, we have studied the orientation and conformation of the liquid crystal molecule on clean and silane coated glass surfaces. On both surfaces, the biphenyl group is tilted by 70{degree} with the alkyl chain end pointing away from the surface. The shift in the C-H stretch frequencies in the coadsorbed system indicates a significant interaction between molecules. 9 refs., 3 figs.
Date:
December 1, 1988
Creator:
Superfine, R.; Huang, J.Y. & Shen, Y.R.
Object Type:
Article
System:
The UNT Digital Library
Beneficiation-hydroretort processing of US oil shales, engineering study
This report describes a beneficiation facility designed to process 1620 tons per day of run-of-mine Alabama oil shale containing 12.7 gallons of kerogen per ton of ore (based on Fischer Assay). The beneficiation facility will produce briquettes of oil shale concentrate containing 34.1 gallons of kerogen per ton (based on Fischer Assay). The beneficiation facility will produce briquettes of oil shale concentrate containing 34.1 gallons of kerogen per ton (based on Fischer Assay) suitable for feed to a hydroretort oil extraction facility of nominally 20,000 barrels per day capacity. The beneficiation plant design prepared includes the operations of crushing, grinding, flotation, thickening, filtering, drying, briquetting, conveying and tailings empoundment. A complete oil shale beneficiation plant is described including all anticipated ancillary facilities. For purposes of determining capital and operating costs, the beneficiation facility is assumed to be located on a generic site in the state of Alabama. The facility is described in terms of the individual unit operations with the capital costs being itemized in a similar manner. Additionally, the beneficiation facility estimated operating costs are presented to show operating costs per ton of concentrate produced, cost per barrel of oil contained in concentrate and beneficiation cost per barrel of …
Date:
December 1, 1988
Creator:
Johnson, L. R. & Riley, R. H.
Object Type:
Report
System:
The UNT Digital Library
Develop and test fuel cell powered on-site integrated total energy systems
This report describes the design, fabrication and testing of a 25kW phosphoric acid fuel cell system aimed at stationary applications, and the technology development underlying that system. The 25kW fuel cell ran at rated power in both the open and closed loop mode in the summer of 1988. Problems encountered and solved include acid replenishment leakage, gas cross-leakage and edge-leakage in bipolar plates, corrosion of metallic cooling plates and current collectors, cooling groove depth variations, coolant connection leaks, etc. 84 figs., 7 tabs.
Date:
December 1, 1988
Creator:
Kaufman, A. & Werth, J.
Object Type:
Report
System:
The UNT Digital Library
An Exploratory Study of the Relationship Between Curiosity and Print Awareness of Four-Year-Old Children
This study has five chapters, organized in the following manner: (1) Chapter I contains the introduction, statement of the problem, purpose of the study, questions, significance of the study, and definition of terms; (2) Chapter II is a review of the literature; (3) Chapter III is a description of subjects and tests and procedures for treating the data; (4) Chapter IV contains the statistical technique of the analysis and the findings related to the questions, and (5) Chapter V consists of the summary, findings, conclusions, and recommendations. The problem of the study was to explore the relationship between curiosity and print awareness among four-year-old children. Subjects participating in the study were 71 four-year-old children from six licensed child care and preschool settings located in different geographical sections of a north central Texas city. The study included thirty-four girls and thirty-seven boys. Instruments used to collect the data were Kreitler, Zigler, and Kreitler's battery of curiosity tasks and Goodman's Signs of the Environment and Book Handling Knowledge tasks. Canonical I correlation analyses do not yield a significant relationship between variables of curiosity and print awareness. An alternate Pearson Product Moment correlation yielded some specific pairwise correlations between certain curiosity variables and …
Date:
December 1988
Creator:
Estrada, Anita
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Relationship of Student Mathematics Scores on the Scholastic Aptitude Test to Teacher Effectiveness as Measured by the Texas Teacher Appraisal System
The purposes of this study were (1) to determine the scores on the quantitative portion of the SAT for 110 students and these students' math teachers' ratings on the TTAS, (2) to determine the nature of the relationship of the students' SAT scores to their teachers' TTAS ratings, and (3) to determine the nature of the relationship of the students' SAT scores to their sex. It was hypothesized that (1) there would be no significant relationship between a student's math score as measured by the quantitative portion of the SAT and the effectiveness of the student's math teacher as measured by the TTAS, and (2) there would be no significant relationship between a student's math score as measured by the quantitative portion of the SAT and the student's sex. The 110 subjects (60 males and 50 females) In this study took the quantitative portion of the SAT during the 1986-87 school year. This sample was drawn from a large suburban high school in the North Texas area. The effectiveness of the math teachers who taught the 110 students was measured by the Texas Teachers Appraisal System (TTAS). The statistical analyses indicated that (1) there was no significant relationship between a …
Date:
December 1988
Creator:
Clingman, Elizabeth Ann
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Transposition and the Transposed Modes in Late-Baroque France
The purpose of the study is the investigation of the topics of transposition and the transposed major and minor modes as discussed principally by selected French authors of the final twenty years of the seventeenth century and the first three decades of the eighteenth. The sources are relatively varied and include manuals for singers and instrumentalists, dictionaries, independent essays, and tracts which were published in scholarly journals; special emphasis is placed on the observation and attempted explanation of both irregular signatures and the signatures of the minor modes. The paper concerns the following areas: definitions and related concepts, methods for singers and Instrumentalists, and signatures for the tones which were identified by the authors. The topics are interdependent, for the signatures both effected transposition and indicated written-out transpositions. The late Baroque was characterized by much diversity with regard to definitions of the natural and transposed modes. At the close of the seventeenth century, two concurrent and yet diverse notions were in evidence: the most widespread associated "natural" with inclusion within the gamme; that is, the criterion for naturalness was total diatonic pitch content, as specified by the signature. When the scale was reduced from two columns to a single one, …
Date:
December 1988
Creator:
Parker, Mark M. (Mark Mason)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Group Counseling as an Intervention in Anger Expression and Depression in Older Adults
Depression is believed to be the most prevalent mental dysfunction among older adults, and depression and anger are frequently linked in theory and in therapy. This study was undertaken to determine whether participation in group counseling sessions would increase awareness and expression of anger and decrease depression levels in women aged 65 and older. Treatment group members were compared to a matching control group. Both groups completed the Anger Self Report Questionnaire and the Beck Depression Inventory. Comparison of the ASR subscale scores, Awareness of Anger, Expression of Anger, Guilt, Condemnation of Anger, and Mistrust, revealed no significant differences between the treatment and control groups. However, the treatment group scored significantly higher on the BDI than did the control group. Analysis of variance of the ASR and the BDI, and the variables upon which the treatment and control groups were matched revealed some significant differences, and comparison of the women in this study with the two groups upon whom the ASR was validated showed this study's older women scored significantly lower than the validation groups on the ASR. The author concluded that six sessions is not long enough to effect change in either anger awareness or expression in older women, …
Date:
December 1988
Creator:
Johnson, Wanda Y. (Wanda Yates)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Purchasing Power Parity and the Efficient Markets: the Recent Empirical Evidence
The purpose of the study is to empirically determine the relevance of PPP theory under the traditional arbitrage and the efficient markets (EPPP) frameworks during the recent floating period of the 1980s. Monthly data was collected for fifteen industrial nations from January 1980 to December 1986. The models tested included the short-run PPP, the long-run PPP, the EPPP, the EPPP with deviations from expectations, the forward rates as unbiased estimators of future spot rates, the EPPP and the forward rates, and the EPPP with forward rates and lagged values. A generalized regression method called Seemingly Unrelated Regression (SUR) was employed to test the models. The results support the efficient markets approach to PPP but fail to support the traditional PPP in both the short term and the long term. Moreover, the forward rates are poor and biased predictors of the future spot rates. The random walk hypothesis is generally supported.
Date:
December 1988
Creator:
Yuyuenyongwatana, Robert P. (Robert Privat)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Perceptions of College and University Auditors Concerning the Importance of Selected Factors Associated with Operational Auditing
The primary purpose of this study was to identify and analyze the perceptions of college and university auditors concerning the importance of selected factors associated with operational auditing. The secondary purpose was to determine whether the perceptions of certified auditors differ significantly from those of noncertified auditors. Selected factors associated with operational auditing for colleges and universities were categorized in three attribute groups—organizational, personal, and environmental. The identification of organizational and personal attributes was based mainly on concepts set forth in the Standard for the Professional Practice of Internal Auditing published by the Institute of Internal Auditors (1978). Identification of environmental attributes was based on a review of the relevant literature, as well as on discussions with selected college and university auditors. Each attribute, whether categorized as organizational, personal, or environmental, was used as a basis for the identification of detailed factors associated with operational auditing. The findings of this study reveal that factors dealing with organizational attributes were perceived as considerably more favorable than were factors dealing with personal or environmental attributes. With regard to the secondary purpose of this research, a total of 14 hypotheses were developed and subjected to t-tests to determine whether the perceptions of certified …
Date:
December 1988
Creator:
Nikkhah-Azad, Ali
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Descriptive Profile of Freshman Student-Athletes on a Division IAA University Intercollegiate Football Team for Consideration in General Administrative Decision Making Processes
The purpose of this study is to identify which characteristics of student-athletes are most helpful in making administrative decisions about intercollegiate athletic programs, and then to develop a descriptive profile of a group of student-athletes at a particular university. Additional purposes include comparing these descriptive data with other group data and with perceptions of the same group of student-athletes by faculty administrators at the same university. Data were collected in four phases. First, a jury of three experts developed a list of student-athlete characteristics they believed to be helpful in making administrative decisions regarding those athletes. Next, information was gathered to develop a descriptive profile of a selected group of eighteen student-athletes based on the identified characteristics. Next, statistical comparisons were made with available data from other groups of students and from the eight Athletic Council members' perceptions of the study group. Major findings include the identification of useful characteristics, inconsistencies between student-athlete high school ranks in class and SAT scores, high scores in hostility, and accurate perceptions of student-athletes by Athletic Council members.
Date:
December 1988
Creator:
Gunn, Lindsey
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Effects of an Educational Program on Registered Nurse Students' Ability to Write Complete Nursing Diagnoses
This study examined the effectiveness of a training program on the ability of registered nurse students to write complete nursing diagnoses. A comparison group was used as a control. There were 47 participants in the training group and 51 participants in the comparison group who received no training. Five hypotheses were used to examine the (1) complete nursing diagnoses, (2) labels, (3) clarifiers, (4) etiologies, and (5) mislabeled medical diagnoses or clinical problems as nursing diagnoses. As a pretest and posttest, participants in both groups viewed a video tape of a nursing situation and were asked to write nursing diagnoses. The training group received nine clock hours of classroom instruction on the nursing process of which three hours were on nursing diagnosis with a focus on the inclusion of label, clarifier, and etiology necessary for a complete nursing diagnosis. In the clinical component of the educational program the training group wrote nursing diagnoses as part of the nursing process. It was assumed that the comparison group did not receive comparable education. The mean difference of proportions between the pretest and posttest was computed for each group on the item tested by the hypotheses and for the difference between the two …
Date:
December 1988
Creator:
Vernon, Yvonne B. (Yvonne Bailey)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Farming Someone Else's Land: Farm Tenancy in the Texas Brazos River Valley, 1850-1880
This dissertation develops and utilizes a methodology for combining data drawn from the manuscript census returns and the county tax rolls to study landless farmers during the period from 1850 until 1880 in three Texas Brazos River Valley counties: Fort Bend, Milam, and Palo Pinto. It focuses in particular on those landless farmers who appear to have had no option other than tenant farming. It concludes that there were such landless farmers throughout the period, although they were a relatively insignificant factor in the agricultural economy before the Civil War. During the Antebellum decade, poor tenant farmers were a higher proportion of the population on the frontier than in the interior, but throughout the period, they were found in higher numbers in the central portion of the river valley. White tenants generally avoided the coastal plantation areas, although by 1880, that pattern seemed to be changing. Emancipation had tremendous impact on both black and white landless farmers. Although both groups were now theoretically competing for the same resource, productive crop land, their reactions during the first fifteen years were so different that it suggests two systems of tenant farming divided by caste. As population expansion put increasing pressure on the …
Date:
December 1988
Creator:
Harper, Cecil
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library