Search Results

Advanced search parameters have been applied.
open access

Measured and Estimated Lateral Static and Rotary Derivatives of a 1/12-Scale Model of a High-Speed Fighter Airplane With Unswept Wings

Description: Report presenting a low-speed investigation to determine the lateral static and rotary derivatives of a model of a high-speed fighter airplane. The purpose was to compare experimental stability derivatives with derivatives estimated for a wing-fuselage combination, a vertical- and horizontal-tail combination, and a complete model.
Date: January 11, 1954
Creator: Williams, James L.
Partner: UNT Libraries Government Documents Department
open access

Wind-tunnel investigation of effects of fuselage cross-sectional shape, fuselage bend, and vertical-tail size on directional characteristics of nonoverlap-type helicopter fuselage models without rotors

Description: Report presenting a low-speed investigation in the stability tunnel to determine the directional stability characteristics of tandem nonoverlap-type helicopter fuselages without rotors. The investigation consisted of both bent and straight fuselages with either circular or elliptical cross sections and with two vertical-tail sizes.
Date: March 1956
Creator: Williams, James L.
Partner: UNT Libraries Government Documents Department
open access

Directional stability characteristics of two types of tandem helicopter fuselage models

Description: Report presenting a low-speed investigation in the stability tunnel to determine and improve, if possible, the directional stability characteristics of two tandem helicopter fuselages, one representing a helicopter with overlapping rotors and the other a helicopter with nonoverlapping rotors. Results regarding the presentation of data, directional stability of overlap-type fuselage, and directional stability of nonoverlap-type fuselage are provided.
Date: May 1954
Creator: Williams, James L.
Partner: UNT Libraries Government Documents Department
open access

Wind-tunnel investigation of effects of spoiler location, spoiler size, and fuselage nose shape on directional characteristics of a model of a tandem-rotor helicopter fuselage

Description: Report presenting a low-speed investigation made in the stability tunnel to study the effect of spoiler location, spoiler size, and fuselage nose shape on the directional stability characteristics of a model of a tandem-rotor helicopter fuselage. The model was found to be directionally unstable at certain positive angles of attack.
Date: July 1958
Creator: Williams, James L.
Partner: UNT Libraries Government Documents Department
open access

Wind Tunnel Investigation at Low Speed of the Aerodynamic Characteristics of the Army Chemical Corps Model E112 Bomblets

Description: Report discussing an experimental investigation to determine the aerodynamic characteristics of the Army Chemical Corps model E112 bomblets. From Summary: "A detailed analysis has not been made; however, the results showed that a gap between model tips and the end plates or increasing the end-plate size for a solid model could result in a spirally stable configuration." A large amount of data collected from testing and photographs of the model are provided.
Date: November 4, 1955
Creator: Letko, William & Williams, James L.
Partner: UNT Libraries Government Documents Department
open access

Experimental investigation at low speed of effects of fuselage cross section on static longitudinal and lateral stability characteristics of models having 0 and 45 degrees sweptback surfaces

Description: Report presenting an experimental investigation at low speed to determine the effects of fuselage cross section on the static longitudinal and lateral stability characteristics of midwing airplane models with 0 and 45 degrees sweptback surfaces. The results indicated that the main effect of fuselage cross section on the longitudinal and directional stability characteristics of the modles at low angles of attack are caused by the direction contributions of the fuselage.
Date: December 1955
Creator: Letko, William & Williams, James L.
Partner: UNT Libraries Government Documents Department
open access

A Wind-Tunnel Investigation of the Stability of the Antisubmarine Rocket Mk 1 Mod 0

Description: Report discussing an investigation to determine the cause and provide a fix for the instability in flight of the antisubmarine rocket Mk 1 Mod 0. The Magnus effects and their nonlinear variation with angle of attack were found to affect the stability, so reducing the Magnus effects should reduce instability in the missiles. The greatest reduction of Magnus effects was found through a combination of nose-ring spoiler and the original direction of the propeller rotation, but the nose ring increased the drag.
Date: November 13, 1952
Creator: Lichtenstein, Jacob H. & Williams, James L.
Partner: UNT Libraries Government Documents Department
open access

Effect of high-lift devices on the static-lateral-stability derivatives of a 45 degree sweptback wing of aspect ratio 4.0 and taper ratio 0.6 in combination with a body

Description: Report presenting an investigation in the stability tunnel to determine the effect of high-lift devices on the low-speed static-lateral-stability derivatives of a 45 degree sweptback wing of aspect ratio 4.0 and taper ratio 0.6. Comparisons between the increments in the static-lateral-stability derivatives due to flap deflection obtained from experiment and the increments evaluated by a single sweep theory is also made. Results regarding the presentation of results, longitudinal stability characteristics, static lateral stability characteristics, and comparison of calculated and measured values are provided.
Date: November 1952
Creator: Lichtenstein, Jacob H. & Williams, James L.
Partner: UNT Libraries Government Documents Department
open access

Wind-tunnel investigation at low speed of effect of size and position of closed air ducts on static longitudinal and static lateral stability characteristics of unswept-midwing models having wings of aspect ratio 2, 4, and 6

Description: Report presenting an investigation at Mach number 0.13 in the stability tunnel to determine the effects of closed wing-root air ducts on the static longitudinal and lateral stability characteristics of unswept-midwing models with wings of aspect ratio 2, 4, and 6.
Date: September 1955
Creator: Jaquet, Byron M. & Williams, James L.
Partner: UNT Libraries Government Documents Department
open access

Effect of Frequency of Sideslipping Motion on the Lateral Stability Derivatives of a Typical Delta-Wing Airplane

Description: Report presenting an investigation to determine the effect of frequency of sideslipping motion on the lateral stability derivatives of a 60-degree delta-wing airplane configuration. Results regarding the steady-state tests, oscillation-in-sidestep tests, comparison of oscillation data for delta wings with a round edge versus a sharp edge, and effect of sideslip oscillatory derivatives are provided.
Date: September 12, 1957
Creator: Lichtenstein, Jacob H. & Williams, James L.
Partner: UNT Libraries Government Documents Department

Cesarean Section Delivery and Exclusive Breastfeeding in Pakistan: Emerging Challenges

Description: This research examined two interrelated issues relevant to maternal and neonatal health in Pakistan, namely, the rising rates of C-section delivery and low rates of exclusive breastfeeding. By using the Andersen's health behavioral model to frame two empirical studies, the data from the Pakistan Demographic and Health Survey (PDHS) 2012-13 was used. The first empirical study examined the correlation between place of delivery and the odds of cesarean section in Pakistan. Not all Pakistani women have an equal chance of delivering at a health facility where C-section delivery takes place; therefore, the study modeled mode of delivery as a two-step process. In the first step, place of delivery was a function of medical indications and various sociodemographic and community factors. Women who delivered at a health facility were included in the second step, where C-section was a function of medical indications and type of facility (private, public). It is found that women who delivered at a private health facility were more likely to have a C-section, even after controlling for the effects of medical/clinical factors, which is concerning. Findings suggest that the private maternal health sector in Pakistan may be over-medicalizing childbirth. The second study examined this paradox of low exclusive breastfeeding in Pakistan, taking into account not only individual-level characteristics of the child and parents, but also place and mode of delivery, sociocultural factors, and community composition. The sample consisted of 1,044 children 0-5 months old, currently living with their mothers. Binary logistic regressions of exclusive and predominant breastfeeding found women who delivered vaginally, whether at home or health care facility were more likely than mothers who delivered via C-section to predominantly breastfeed their infant, and that mothers who delivered vaginally at a health care facility were more likely than their peers who delivered via C-section to exclusively breastfeed …
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: August 2019
Creator: Nazir, Saman
Partner: UNT Libraries
open access

A Comparative Study of the Habits, Attitudes, and Opinions in Regard to Cigarette Smoking on the Part of Three Hundred Freshman and Sophomore Women Students and Three Hundred Freshman and Sophomore Men Students Enrolled in Physical Education Activity Classes during the Spring Semester of the 1948-1949 Session at North Texas State College, Denton Texas

Description: In undertaking this study the investigator had the following purposes: 1. To determine the percentage of the college women of the study who are cigarette smokers. 2. To determine the percentage of the college men of the study who are cigarette smokers. 3. To determine the carious habits of the students who participated in the study in regard to cigarette smoking. 4. To determine the students' reasons for smoking cigarettes. 5. To determine the opinions and attitudes of the students of the study in regard to cigarette smoking. 6. To compare the women students with the men students of the study in regard to cigarette smoking on the basis of the data obtained.
Date: 1950
Creator: Williams, James L.
Partner: UNT Libraries
open access

Social Capital and Delinquency among Turkish Juveniles

Description: This study examined the relationship between aspects of social capital and self-reported delinquency among Turkish juveniles by using a secondary dataset, which is a part of the European Youth Survey. The survey was conducted among tenth graders in 2007 in Bağcılar, Istanbul. The dependent variable of this study, delinquency, was divided into two groups, minor and major, according to the stipulations of the Turkish Penal Code. Social capital was measured by assessing adolescents’ reports of their direct interactions with their parents, peers and community. In order to predict the likelihood of major and minor delinquency independently, two different subsets (N: 1879 and 1837, respectively) of the data set were used. The findings of the multivariate analyses suggest that a low level of social capital contributed significantly to Turkish juveniles’ engagement in major and minor delinquent activities. Among the social capital items, adolescents’ affiliation with delinquent peers had the strongest correlation with both dependent variables.
Date: August 2011
Creator: Cubukcu, Suat
Partner: UNT Libraries
open access

Intimate Partner Homicide Rates in Chicago, 1988 to 1992: a Modified General Strain Theory Approach

Description: Using data from the Chicago Homicide Dataset for years 1988-1992 and the Chicago Community Area Demographics, multiple regression and mediation analysis are used to examine various community level factors’ impact on Intimate Partner Homicide (IPH) rates per Chicago community area. The relationship between the percentage of non-white and IPH rate per Chicago community area is significant and positive, but disappears once economic strain is taken into account, as well as when family disruption is included in the model. There is a weak, but positive relationship between population density and IPH rates, but neither economic strain nor family disruption mediates the relationship between population density and IPH rates. Economic deprivation is positively related to IPH rates, but economic strain and family disruption partially mediate the relationship between economic deprivation and IPH rates. Finally, the relationship between the percentage of males aged 30-59 and IPH rates per community area in Chicago is moderately negative, but this relationship disappears once economic strain is accounted for in the model. However, family disruption does not mediate the relationship between the percentage of males aged 30-59 and IPH rates. These results indicate that some structural covariates impact IPH rates and that some relationships are mediated by economic strain and family disruption. These results also lend support to a modified approach to general strain theory (GST). More research is necessary to validate these results.
Date: August 2013
Creator: Johnson, Natalie Jo
Partner: UNT Libraries
open access

Analyzing Delinquency Among Kurdish Adolescents: a Test of Hirschi’s Social Bonding Theory

Description: This study examines the mediating effect of social bonding on delinquent behavior among Kurdish teens. Major influences to the study of self concept and delinquency based on Hirschi’s social bonding theory are reviewed. The data was collected from a sample of 100 Kurdish teens attending a Gülen affiliated school (Private Çaglayan Murat Anatolian Science High School in Şanlıurfa, Turkey) and 100 Kurdish teens attending a public (non- Gülen) school (The Public High School in Diyarbakır, Turkey). There are two dependent variables for this research project: Involvement in major delinquency and involvement in minor delinquency. The components of social bonding attachment, involvement, commitment, and belief were used as independent variables. Participants’ age ranged between 16 to 18 years. I hypothesize that the relation between the social bonding elements and delinquency should be stronger in the case of Kurdish adolescents who are more attached to conventional Turkish society. Results from binary logistic regression analyses indicate that in the absence of bonding, Kurdish teenagers tend to engage in major and minor delinquent activities. For further exploration and results, the Gülen Movement was examined as an independent variable. Findings suggest a strong relationship between the Gülen Movement and Kurdish adolescents’ probability of involvement in either major or minor delinquent activities. Finally, several directions for future research on Hirschi’s social bonding theory are recommended and some implications are drawn for deterring Kurdish adolescents from becoming involved in delinquent actions.
Date: December 2013
Creator: Ziyanak, Sebahattin
Partner: UNT Libraries

Measures and Correlates of Daily Spiritual Experiences

Description: Although a change of religious landscape in America in recent years has been suggested and widely accepted in the social sciences, most studies tend to focus on measures of religiosity and how it is changing. The subject of spirituality and its correlates seem to be mostly ignored. This study utilizes nationally representative data generated for the first time in General Social Survey (GSS) on the subject of spirituality to measure Americans' spirituality and daily spiritual experiences and their most significant correlates. In this study, most Americans (89%) showed to have some degree of spirituality and daily spiritual experiences. Moreover, variables of gender, race/ethnicity, marital status, religious origin, and residence in conservative region when growing up shown to be significant predictors of spirituality.
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: December 2006
Creator: Mirbaha-Hashemi, Fariba
Partner: UNT Libraries
open access

Energy Paths and Political Commitments: Their Roles in Environmental Inequality

Description: Decentralized renewable energy procurement has gained traction in recent years for its potential to alleviate rural energy poverty and environmental degradation in developing countries. Hence, this study investigates if deploying renewable energy can mitigate rural energy poverty in developing countries as often claimed. Because any energy regime cannot be initiated or sustained without the conviction of local political leaders, the study also evaluates the extent to which government investments in the development of renewable energy technologies and the energy sector, affect the environmental quality (i.e. greenhouse gas emissions) of developing countries. Energetic theory and environmental inequality constitute the key conceptual premises guiding this study. Ordinary least squares regression is utilized to analyze the relationship between key variables. The results reveal that as of 2010, use of renewable energy can indeed support rural electrification. Higher GNI per capita and use of conventional fuels are also positively related to rural electrification, all else equal. As for environmental degradation in 2005 and 2008, R&D investments actually tend to increase GHG emissions; procuring energy from either renewable or non-renewable sources is however, found to be environmentally detrimental, net of all other variables. Finally, some evidence is found for the role of aid funds and multilateral debt in abating GHG emissions.
Date: May 2014
Creator: Ong, Corinne
Partner: UNT Libraries
open access

Wind-tunnel investigation at low speed of the aerodynamic characteristics of the Army Chemical Corps model E112 bomblets

Description: "An experimental investigation has been made n the Langley stability tunnel to determine the aerodynamic characteristics of the Army Chemical Corps model E112 bomblets. A detailed analysis has not been made; however, the results showed that a gap between model tips and the end plates or increasing the end-plate size for a solid model could result in a spirally stable configuration" (p. 1).
Date: November 4, 1955
Creator: Letko, William & Williams, James L.
Partner: UNT Libraries Government Documents Department
open access

Health Status and Access Disparities Among the Uninsured Working-Age Population in a Safety-Net Healthcare Network in Tarrant County, Texas

Description: The objective of this research was to determine if healthcare access disparities exist across race and gender in a publically funded safety-net healthcare system in Texas. Data were examined from a representative random sample of 1468 adults aged 18-64 who were patients in this safety-net system in July and August of 2000 and were analyzed using binary logistic regression and chi-square measures of significance. Major Findings: On measures of health status - overall health rating (p =.051), limited employment (p =.000), energy level (p =.001), and worry (p =.012) - Anglos reported the worst health; Mexican Americans, the best health; with African Americans intermediate. Mexican Americans were more likely to have never had health insurance, and to also have had insurance in the past year; Anglos were least likely to have ever had insurance (p =.015) or to have had insurance in the past year (p =.000). On use of EDs (p =.028), problems getting prescription medicines (p =.029), and foregoing other necessities of life to pay for healthcare, Mexican Americans were least disadvantaged with African Americans reporting greatest use of EDs among both men and women, and Anglos the most problems with prescription medicines and foregoing care, especially among women. Logistic regression revealed that health status was the strongest predictor of problems accessing healthcare in all groups; the poorer health status of safety-net patients, the more problems they had accessing care. Patterns of poor reported health status and greater problems accessing care among Anglos relative to other groups is discussed in terms of social drift and relative deprivation.
Date: December 2009
Creator: Queen, Courtney M.
Partner: UNT Libraries
open access

Are Alzheimer's Special Care Units Really Special? Effects of Residential Status on Family Members' Perspectives on High Quality Care for their Loved-Ones in Long-Term Care

Description: This analysis of secondary data collected from family members of nursing home residents in North Texas (n = 422) used a mixed methods approach to determine if there is a difference in perspectives on quality care among family members of Alzheimer’s/Dementia Special Care Unit (ADSCU) residents compared to those of non-ADSCU residents. Descriptive content analysis was used identify and condense responses to an open-ended question into four meaningful categories of qualities of care. An independent t-test was employed to determine if there was a difference between family members of ADSCU residents and family members of non-ADSCU residents regarding their rating of their loved-ones’ nursing home on the important qualities of care they identified from the open-ended question. Closed-ended questions were organized into indices of these qualities of care, and ordinary least square regression was employed to determine if there were significant differences between perceptions of family members of ADSCU residents and those of non-ADSCU residents regarding care their loved-ones are receiving on these qualities of care, controlling for frequency of visit.
Date: August 2011
Creator: Fawcett, Elizabeth Jean
Partner: UNT Libraries
open access

The Structural Determinants of Americans' Justice Perceptions Toward Inequality in the U.S.

Description: In accordance with structural theory and distributive justice theory, this study investigates if Americans' personal encounters with the opportunity structure and their existing reward conditions will influence their perceptions toward distribution outcomes in the U.S. I argue that higher-status individuals possessing various "attributes of structural privilege" will exhibit less support for regulating income inequality in society than lower-status individuals. Upward mobility should also be negatively related to support for restoring greater equality in allocation outcomes. However, the effect of mobility on justice perceptions should vary by class status, since class has been known to be a reliable predictor of these attitudes. The study employed a sample of 438 American adults from the GSS 2000 dataset, and ordinary least squares (OLS) regression was applied in the analyses of the data. Two of the three above hypotheses received partial confirmation, that is, there were class, race, and gender differences in distributive justice perceptions. Class also interacted significantly with occupational mobility in altering distributive justice perceptions.
Date: December 2012
Creator: Ong, Corinne
Partner: UNT Libraries
open access

An Examination of Strain Among Community Police Officers in Northumbria, England

Description: This paper examines some causes of strain and frustration among police officers. Previous research suggests that police officers sufferfromthe lack of communication and support from their community. The failure of communication has caused turmoil in the past between communities and their police. A possible solution is community policing. Community policing is supposed to establish communication between the public and the police. Causes of strain and frustration among the police are discussed along with the possible benefits of community policing. Research has shown that community police officers suffer less strain and frustration than their brethren. On this premise a quantitative examination a police force in Northumbria, England was conducted. The quantitative analysis focuses on two groups; community police officers and police officers not involved in community policing.
Date: May 1994
Creator: Humburg, Joel D. (Joel David)
Partner: UNT Libraries
open access

Determinants of Mental Health Problems Among College Students

Description: Many college students have reported struggling with mental health problems while dealing with challenging demands of college. The initial theoretical framework for this research was Pearlin's stress process model (SPM). Building on the SPM, the three additional mediating variables of perceived control, meaninglessness, and financial worries were added to create a composite model for the research. Mental health outcomes in the model were measured by a comprehensive range of factors, which included: psychological distress, suicide, substance abuse, and anger. Data were collected from a non-probability convenience sample of 463 undergraduate students attending a large state supported university in the southwestern region of the United States. Among the social status variables measured, being married, female, and white were significant predictors of poor mental health in the sampled college students. Poor self-image, feeling of meaninglessness, and worrying about current and future finances were significant mediating variables. Poor mental health could make individuals overwhelmed and discouraged. This is a formula for failure in college. The results of this study contribute to a better understanding of the correlates of mental health problems among college students. A greater understanding means that families and college administrations will have better ideas about how to intervene to reduce the stress of students and to focus the available and often limited resources to help young adults in their college experience.
Date: December 2010
Creator: Mirbaha-Hashemi, Fariba
Partner: UNT Libraries
open access

Gender and Juvenile Case Processing: A Look at Texas

Description: This dissertation examines the role gender plays in predicting referral beyond juvenile court intake. Using referral data from Texas for 1999-2003, multinomial logistic regression is used to examine case processing decisions. Males were found to be more likely than females to be processed beyond intake for both status and delinquent offenses. Legal variables were found to influence processing decisions for delinquent offenses more than non-legal variables. In contrast, non-legal variables were found to influence processing decisions more than legal variables for status offenses. Finally, overall, minority females were not found to be more likely to be processed beyond intake than white females. Further research is needed to determine if the same finding is true for males.
Date: August 2009
Creator: Johnson, Dustin Paul
Partner: UNT Libraries
Back to Top of Screen