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Morphological properties of poly (ethylene terephthalate) (PET) nanocomposites in relation to fracture toughness.

Morphological properties of poly (ethylene terephthalate) (PET) nanocomposites in relation to fracture toughness.

Date: August 2005
Creator: Pendse, Siddhi
Description: The effect of incorporation of montmorillonite layered silicate (MLS) on poly (ethylene terephthalate) (PET) matrix was investigated. MLS was added in varying concentration of 1 to 5 weight percent in the PET matrix. DSC and polarized optical microscopy were used to determine the crystallization effects of MLS addition. Non isothermal crystallization kinetics showed that the melting temperature and crystallization temperature decrease as the MLS percent increases. This delayed crystallization along with the irregular spherulitic shape indicates hindered crystallization in the presence of MLS platelets. The influence of this morphology was related with the fracture toughness of PET nanocomposites using essential work of fracture coupled with the infra red (IR) thermography. Both the essential as well as non essential work of fracture decreased on addition of MLS with nanocomposite showing reduced toughness.
Contributing Partner: UNT Libraries
A morphological study of the avian (Gallus domesticus) ductus arteriosi during hatching.

A morphological study of the avian (Gallus domesticus) ductus arteriosi during hatching.

Access: Use of this item is restricted to the UNT Community.
Date: May 2006
Creator: Belanger, Candace
Description: The ductus arteriosi (DA) are two blood vessels connecting the pulmonary arteries to the descending aorta in the avian embryo. Following hatching, the DA closes, separation of the systemic and pulmonary circulation. I present the morphological changes that occur in the chicken DA during prepipping, internal pipping, external pipping, and hatching. The avian DA consists of two distinct tissue types, a proximal and a distal portion. Histological examination shows developmental differences between the proximal and distal portions of the DA with regard to lumen occlusion, endothelial cells, smooth muscle and elastin. Endothelial cell proliferation begins to occur as early as external pipping, with the lumen almost completely occluded by the 3rd day of post-hatching life. Expression of vascular endothelial growth factor (VEGF) increases in avian endothelial cells during hatching. I provide a morphological timeline of changes in the DA as the chicken develops from embryo to hatchling.
Contributing Partner: UNT Libraries
Mortality of Striped Bass Eggs and Larvae in Nets: A Special Report to Consolidated Edison Company of New York, Inc.

Mortality of Striped Bass Eggs and Larvae in Nets: A Special Report to Consolidated Edison Company of New York, Inc.

Date: July 1976
Creator: New York University. Medical Center. Institute of Environmental Medicine.
Description: This report summarizes the results of studies conducted to determine the net-induced mortality rates of striped bass in the Hudson River. In the study, an experimental flume was constructed to test the "efficacy of devices designed to reduce fish impingement at the Indian Point generating station" (p. 2).
Contributing Partner: UNT Libraries
Mosques in France: The Visible Presence of Islam

Mosques in France: The Visible Presence of Islam

Date: May 2011
Creator: Arnold, Ashley Patricia
Description: Numerous laws are being directed toward subduing the visible presence of Islam throughout France, and in return French Muslims are becoming bolder in the projection of their faith. This thesis examines the presence of Islam in France throughout history and in contemporary French civilization. Specifically, this thesis addresses the issues regarding the visible presence of Islam in France through such institutions as mosques and how they are the key symbols representing the prominence of Islam in France. It looks at what lies in the collective French mind that creates such an influence on today's policies and outlook, as well as identifies the key characters that dominate the current affairs surrounding Islam in France. The thesis reviews the country's past relations with the visible presence of Islam through the controversies surrounding the construction of famous mosques. In addition, this thesis underlines key areas where both the State and the Muslim population must make concessions in order to avoid further conflict.
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The Most Important Educational Problems Affecting the Growth of Elementary Schools of Texas, 1972

The Most Important Educational Problems Affecting the Growth of Elementary Schools of Texas, 1972

Date: August 1972
Creator: Nicholson, Sara Carolyn, 1922-
Description: The problem with which this investigation is concerned is the identification of conditions, situations, and events that are important problems faced in the public elementary schools of Texas. Problems are categorized into sixteen areas: finance, desegregation and busing, school organization, school personnel, preschool and kindergarten, instructional improvement, reporting systems, pupil behavior, curriculum, in-service staff training, humanizing the schools, public relations, minority groups, migrant children, special education, and recent trends. The purpose of the study is to determine perceived importance of problems and to establish priorities of current issues from information obtained from education leaders of elementary schools.
Contributing Partner: UNT Libraries
Mother-child Relations and Social Expectations of Normal Children and Those with Learning Disabilities

Mother-child Relations and Social Expectations of Normal Children and Those with Learning Disabilities

Date: August 1973
Creator: Wilson, Connie S.
Description: The study explored the possibility that the perceived mother-child relationship of children with learning disabilities differs from that of normal children. It was further hypothesized that the manner in which the child perceives his relationship to his mother is related to the perception he has of his society in general.
Contributing Partner: UNT Libraries
Mothers' and Fathers' Parenting Characteristics in Relation to Family Earner Status and Self-perceived Interpersonal Competence

Mothers' and Fathers' Parenting Characteristics in Relation to Family Earner Status and Self-perceived Interpersonal Competence

Date: December 2012
Creator: Chang, Wen-Chuan Rita
Description: With an increasing number of married mothers who participated in paid work roles, fathers with full-time employed spouses now are expected to assume the role of caregiver and have higher frequency of engagement in parenting practices. This study of 235 university students from dual-earner and single-earner families investigated their retrospective perceptions of both mothers' and fathers' frequency of engagement in overall and specific parenting behaviors. These perceptions were measured by the Parent Behavior Frequency Questionnaire-Revised Scale, which includes seven parenting characteristics and related behaviors. Paired samples t-tests suggested that married mothers, whether fully employed outside the home or not, engaged more frequently, than their full-time employed spouses, in parenting characteristics related to bonding, education, general welfare and protection, responsivity, and sensitivity. However, mothers' employment status had little influence upon the frequency at which either parent engaged in any of the seven parenting characteristics and related behaviors. University students who perceived that both parents were more frequently engaged in specific parenting behaviors related to education, responsivity and sensitivity rated themselves higher on interpersonal competence, as measured by the Interpersonal Competence Questionnaire-Revised Scale. Students who perceived that both parents were less frequently engaged in negative parenting behaviors rated themselves higher on competence ...
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Mothers as Play Therapists for their Children

Mothers as Play Therapists for their Children

Date: December 1970
Creator: Karotkin, Kenneth M.
Description: The problem with which this investigation is concerned is that of determining whether previously untrained, non-professional personnel, in this case mothers, can be trained to undertake and cope with the responsibilities of a play therapy situation with their own children. The hypothesis of this study is that by placing mothers in such a situation, the mother's ability to communicate with her child will be modified as well as modifying the child's perception of her as a warm and accepting parent.
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Mothers' Perceptions and Preschoolers' Experiences: Cultural Perspectives of Early Childhood Education

Mothers' Perceptions and Preschoolers' Experiences: Cultural Perspectives of Early Childhood Education

Date: August 1994
Creator: West, Martha M. (Martha Myrick)
Description: In this qualitative investigation, the ways in which four ethnically diverse mothers' perceptions of early childhood education combined with the school experiences of their children were examined. Research tools included audiotaped interviews with Mexican-American, Korean-American, African-American, and Anglo mothers; videotaped school experiences; and a video message with a viewing guide requesting written reaction.
Contributing Partner: UNT Libraries
Motion Versus Non-Motion in Interactive Video Lessons in High School Physical Science

Motion Versus Non-Motion in Interactive Video Lessons in High School Physical Science

Date: May 1992
Creator: Speers, Jimmy D. (Jimmy Dale)
Description: The most important question addresed in this study was whether there is any difference in student learning between a motion group and a non-motion group. The interactive video courseware is currently a part of the curriculum in this district. It was used in its original form with the contrast group. For the experimental group one unit of the courseware was modified to remove the motion video and replace it with photorealistic graphics that served as the non-motion part of the study. Covariates were selected to compensate for any differences in the two groups. A pretest and posttest was administered to both groups. Analysis of the posttest scores indicated that there was no difference in learning if motion in the presentation was the only variable.
Contributing Partner: UNT Libraries