UNT Theses and Dissertations - 10,169 Matching Results

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Design, Synthesis, and Characterization of Aqueous Polymeric Hybrid Composites and Nanomaterials of Platinum(II) and Gold(I) Phosphorescent Complexes for Sensing and Biomedical Applications

Description: The two major topics studied in this dissertation are the gold(I) pyrazolate trimer {[Au(3-R,5-R’)Pz]3} complexes in aqueous chitosan polymer and phosphorescent polymeric nanoparticles based on platinum(II) based complex. The first topic is the synthesis, characterization and optical sensing application of gold(I) pyrazolate trimer complexes within aqueous chitosan polymer. A gold(I) pyrazolate trimer complex, {[Au(3-CH3,5-COOH)Pz]3}, shows high sensitivity and selectivity for silver ions in aq… more
Date: December 2015
Creator: Upadhyay, Prabhat Kumar
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Design, Synthesis and Characterization of Polymer and Protein Coated Hybrid Nanomaterials: Investigation of Prototypes for Antimicrobial and Anticancer Applications

Description: This work involves synthesis and characterization of isotropic and anisotropic noble metal nanoparticles for applications ranging from antimicrobial uses to anticancer applications. These nanomaterials are stabilized in genuinely benign biomaterials ranging from polymers to cross linked proteins for targeted cancer treatments. The nanoparticles are found to have tunable optical properties.
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Date: May 2019
Creator: Korir, Daniel Kiplangat
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Design, Synthesis and Optoelectronic Properties of Monovalent Coinage Metal-Based Functional Materials toward Potential Lighting, Display and Energy-Harvesting Devices

Description: Groundbreaking progress in molecule-based optoelectronic devices for lighting, display and energy-harvesting technologies demands highly efficient and easily processable functional materials with tunable properties governed by their molecular/supramolecular structure variations. To date, functional coordination compounds whose function is governed by non-covalent weak forces (e.g., metallophilic, dπ-acid/dπ-base stacking, halogen/halogen and/or d/π interactions) remain limited. This is unlike t… more
Date: August 2017
Creator: Ghimire, Mukunda Mani
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Design, Synthesis and Study of Supramolecular Donor – Acceptor Systems Mimicking Natural Photosynthesis Processes

Description: This dissertation investigates the chemical ingenuity into the development of various photoactive supramolecular donor – acceptor systems to produce clean and carbon free energy for the next generation. The process is inspired by the principles learned from nature’s approach where the solar energy is converted into the chemical energy through the natural photosynthesis process. Owing to the importance and complexity of natural photosynthesis process, we have designed ideal donor-acceptor system… more
Date: December 2015
Creator: KC, Chandra Bikram
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Designing Archival Collections to Support Language Revitalization: Case Study of the Boro Language Resource

Description: Indigenous communities around the world are losing their languages at accelerating rates to the effects of the climate crisis and global capitalism. To preserve samples of these languages facing endangerment and extinction, samples of language use (e.g., audio-video recordings, photographs, textual transcriptions, translations, and analyses) are created and stored in language archives: repositories intended to provide long-term preservation of and access to language materials. In recent years, … more
Date: May 2023
Creator: Burke, Mary
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A Detailed Investigation, Comparison, and Analysis of the Practice Habits of Undergraduate Vocal and Piano Performance Majors

Description: For musicians of all kinds, practice is an essential component in establishing and refining their skills. How a musician learns the art of practicing, and at what point in their musical and cognitive development can vary drastically. The purpose of this research is to understand how two groups of musicians, undergraduate vocal performance majors and undergraduate piano performance majors, developed (or consequently failed to develop) their respective knowledge pertaining to effective practice p… more
Date: December 2018
Creator: Radziun, Barrett
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Detecting Cognitive Impairment in Older Adults: a Validation Study of Selected Screening Instruments

Description: The present study investigated the criterion-based validity of the Mini-Mental State Examination (MMSE), the Cognitive Capacity Screening Examination (CCSE), and the Neurobehavioral Cognitive Status Examination (NCSE) in a sample of older adults with suspected cognitive impairment. As cognitive screening tests, the MMSE, CCSE, and NCSE should predict performance relative to a more thorough testing procedure. In the present study, performance on the Halstead-Reitan Neuropsychological Test Batter… more
Date: May 1993
Creator: McBride-Houtz, Patricia (Patricia Ann)
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Detecting Masculinity: The Positive Masculine Qualities of Fictional Detectives.

Description: Detective fiction highlights those qualities of masculinity that are most valuable to a contemporary culture. In mysteries a cultural context is more thoroughly revealed than in any other genre of literature. Through the crimes, an audience can understand not only the fears of a particular society but also the level of calumny that society assigns to a crime. As each generation has needed a particular set of qualities in its defense, so the detective has provided them. Through the detective's r… more
Date: August 2007
Creator: Griswold, Amy Herring
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Detecting the Presence of Disease by Unifying Two Methods of Remote Sensing.

Description: There is currently no effective tool available to quickly and economically measure a change in landmass in the setting of biomedical professionals and environmental specialists. The purpose of this study is to structure and demonstrate a statistical change-detection method using remotely sensed data that can detect the presence of an infectious land borne disease. Data sources included the Texas Department of Health database, which provided the types of infectious land borne diseases and indica… more
Date: May 2002
Creator: Reames, Steve
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Detection and Classification of Cancer and Other Noncommunicable Diseases Using Neural Network Models

Description: Here, we show that training with multiple noncommunicable diseases (NCDs) is both feasible and beneficial to modeling this class of diseases. We first use data from the Cancer Genome Atlas (TCGA) to train a pan cancer model, and then characterize the information the model has learned about the cancers. In doing this we show that the model has learned concepts that are relevant to the task of cancer classification. We also test the model on datasets derived independently of the TCGA cohort and s… more
Date: July 2023
Creator: Gore, Steven Lee
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Detection and Classification of Heart Sounds Using a Heart-Mobile Interface

Description: An early detection of heart disease can save lives, caution individuals and also help to determine the type of treatment to be given to the patients. The first test of diagnosing a heart disease is through auscultation - listening to the heart sounds. The interpretation of heart sounds is subjective and requires a professional skill to identify the abnormalities in these sounds. A medical practitioner uses a stethoscope to perform an initial screening by listening for irregular sounds from the … more
Date: December 2016
Creator: Thiyagaraja, Shanti
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Detection of Generalizable Clone Security Coding Bugs Using Graphs and Learning Algorithms

Description: This research methodology isolates coding properties and identifies the probability of security vulnerabilities using machine learning and historical data. Several approaches characterize the effectiveness of detecting security-related bugs that manifest as vulnerabilities, but none utilize vulnerability patch information. The main contribution of this research is a framework to analyze LLVM Intermediate Representation Code and merging core source code representations using source code properti… more
Date: December 2018
Creator: Mayo, Quentin R
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Detection of Malingering on Raven's Standard Progressive Matrices and the Booklet Category Test

Description: The capacity of Raven's Standard Progressive Matrices (SPM) and the Booklet Category Test (BCT) to discriminate between groups of brain-injured, simulated malingering, and normal participants was investigated in this study. Exploratory analyses were also conducted to examine the differences between groups categorized as sophisticated and naive fakers. Clinical decision rules and discriminant function analyses were utilized to identify malingerers. Clinical decision rules ranged in hit rates fro… more
Date: December 1997
Creator: Isler, William C. (William Charles)
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The Detection of Neuropsychological Malingering

Description: The present study compared the responses of a group of simulating malingerers who were offered a monetary incentive to feign symptoms of a head injury, with the responses of head injured groups both with and without litigation, a forensic parole group, and an honest-responding control group. The following six neuropsychological measures were utilized: Rey 15-Item Memory Test, Controlled Oral Word Association Test, Finger Oscillation Test, WAIS-R Neuropsychological Instrument (Vocabulary, Inform… more
Date: August 2003
Creator: Liff, Christine D.
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Detection of Temporal Events and Abnormal Images for Quality Analysis in Endoscopy Videos

Description: Recent reports suggest that measuring the objective quality is very essential towards the success of colonoscopy. Several quality indicators (i.e. metrics) proposed in recent studies are implemented in software systems that compute real-time quality scores for routine screening colonoscopy. Most quality metrics are derived based on various temporal events occurred during the colonoscopy procedure. The location of the phase boundary between the insertion and the withdrawal phases and the amount … more
Date: August 2013
Creator: Nawarathna, Ruwan D.
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Detection of the Resonant Vibration of the Cellular Membrane Using Femtosecond Laser Pulses

Description: An optical detection technique is developed to detect and measure the resonant vibration of the cellular membrane. Biological membranes are active components of living cells and play a complex and dynamic role in life processes. They are believed to have oscillation modes of frequencies in the range of 1 to 1000 GHz. To measure such a high-frequency vibration, a linear laser cavity is designed to produce a train of femtosecond pulses of adjustable repetition rate. The method is then directly ap… more
Date: December 1989
Creator: Jamasbi, Nooshin
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Detection of Ulcerative Colitis Severity and Enhancement of Informative Frame Filtering Using Texture Analysis in Colonoscopy Videos

Description: There are several types of disorders that affect our colon’s ability to function properly such as colorectal cancer, ulcerative colitis, diverticulitis, irritable bowel syndrome and colonic polyps. Automatic detection of these diseases would inform the endoscopist of possible sub-optimal inspection during the colonoscopy procedure as well as save time during post-procedure evaluation. But existing systems only detects few of those disorders like colonic polyps. In this dissertation, we address … more
Date: December 2015
Creator: Dahal, Ashok
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Determinacy of Schmidt's Game and Other Intersection Games

Description: Schmidt's game, and other similar intersection games have played an important role in recent years in applications to number theory, dynamics, and Diophantine approximation theory. These games are real games, that is, games in which the players make moves from a complete separable metric space. The determinacy of these games trivially follows from the axiom of determinacy for real games,ADR, which is a much stronger axiom than that asserting all integer games are determined, AD. One of our m… more
Date: May 2020
Creator: Crone, Logan
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Determinacy-related Consequences on Limit Superiors

Description: Laczkovich proved from ZF that, given a countable sequence of Borel sets on a perfect Polish space, if the limit superior along every subsequence was uncountable, then there was a particular subsequence whose intersection actually contained a perfect subset. Komjath later expanded the result to hold for analytic sets. In this paper, by adding AD and sometimes V=L(R) to our assumptions, we will extend the result further. This generalization will include the increasing of the length of the seq… more
Date: May 2013
Creator: Walker, Daniel
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The Determinants and Consequences of Empathic Parenting: Testing an Expansion of Belsky's Model of Parenting Using SEM

Description: An understanding of factors that enhance empathic parenting behaviors is of considerable importance to the study of child development and to the development of parenting interventions to promote child adjustment. Moreover, gaining a better understanding of the factors that predict empathic parenting with older children is of interest since most research examining parental empathy focuses on infants. These were the goals of the current study. Guided by Belsky's 1984 process model of the determ… more
Date: May 2010
Creator: Morse, Margaret K.
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The Determinants and Consequences of Having a Chief Operating Officer

Description: This study examines the determinant and consequences of having a chief operating officer (COO). Specifically, we investigate chief executive officer (CEO) related factors that affect the choice to employ a COO and look into the impact of having a COO on firm operational efficiency using a data envelopment analysis (DEA)-based measure. Although prior literature has extensively investigated the role of CEOs and chief finance officers (CFOs) on firm outcomes, few studies focus on the impact of CO… more
Date: May 2020
Creator: Le, Linh
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Determinants and Outcomes of Salespeople's Coping Style

Description: Some salespeople cope with the chronic stress that accompanies sales jobs better than others. That is, while all salespeople possess some ability for coping with job stress, some coping mechanisms work better than others. Thus, it is critically important to identify the coping mechanismwhich are associated with the most positive organizational outcomes (i.e., higher performance, increased retention). Research on the coping mechanisms of salespeople is in its exploratory stage. Increased knowled… more
Date: August 1996
Creator: Srivastava, Rajesh, 1964-
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Determinants of Citizens’ 311 Use Behaviors: 311 Citizen-initiated Contact, Contact Channel Choice, and Frequent Use

Description: Facing increasingly complex policy issues and diminishing citizen satisfaction with government and service performance, managing the quality of citizen relationship management has become a main challenge for public managers. Solutions to complex policy problems of service performance and low level of citizen participation often must be developed by encouraging citizens to make their voices heard through the various participation mechanisms. Reflecting on this need, the municipal governments in … more
Date: May 2015
Creator: Wu, Wei-Ning
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Determinants of Coping Strategies and Seeking Counseling Among Older Adults

Description: This study investigated older persons' perception of the negative impact of ill health, retirement, and widowhood in relation to the mobilization of relevant coping mechanisms. In addition, the relationship of coping mechanisms and dissatisfaction with current gender-role identity to seeking counseling was studied. A distributed questionnaire package provided demographic data as well as information pertaining to satisfaction in various areas of life, impact of live events, and coping style. Sub… more
Date: August 1983
Creator: Cole, Carolyn Fillis
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