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  Partner: UNT Libraries
 Language: English
 Collection: UNT Theses and Dissertations
Materials properties of hafnium and zirconium silicates: Metal interdiffusion and dopant penetration studies.

Materials properties of hafnium and zirconium silicates: Metal interdiffusion and dopant penetration studies.

Date: August 2002
Creator: Quevedo-Lopez, Manuel Angel
Description: Hafnium and Zirconium based gate dielectrics are considered potential candidates to replace SiO2 or SiON as the gate dielectric in CMOS processing. Furthermore, the addition of nitrogen into this pseudo-binary alloy has been shown to improve their thermal stability, electrical properties, and reduce dopant penetration. Because CMOS processing requires high temperature anneals (up to 1050 °C), it is important to understand the diffusion properties of any metal associated with the gate dielectric in silicon at these temperatures. In addition, dopant penetration from the doped polysilicon gate into the Si channel at these temperatures must also be studied. Impurity outdiffusion (Hf, Zr) from the dielectric, or dopant (B, As, P) penetration through the dielectric into the channel region would likely result in deleterious effects upon the carrier mobility. In this dissertation extensive thermal stability studies of alternate gate dielectric candidates ZrSixOy and HfSixOy are presented. Dopant penetration studies from doped-polysilicon through HfSixOy and HfSixOyNz are also presented. Rutherford backscattering spectroscopy (RBS), heavy ion RBS (HI-RBS), x-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HR-TEM), and time of flight and dynamic secondary ion mass spectroscopy (ToF-SIMS, D-SIMS) methods were used to characterize these materials. The dopant diffusivity is calculated by modeling ...
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Materials properties of ruthenium and ruthenium oxides thin films for advanced electronic applications.

Materials properties of ruthenium and ruthenium oxides thin films for advanced electronic applications.

Access: Use of this item is restricted to the UNT Community.
Date: May 2006
Creator: Lim, ChangDuk
Description: Ruthenium and ruthenium dioxide thin films have shown great promise in various applications, such as thick film resistors, buffer layers for yttrium barium copper oxide (YBCO) superconducting thin films, and as electrodes in ferroelectric memories. Other potential applications in Si based complementary metal oxide semiconductor (CMOS) devices are currently being studied. The search for alternative metal-based gate electrodes as a replacement of poly-Si gates has intensified during the last few years. Metal gates are required to maintain scaling and performance of future CMOS devices. Ru based materials have many desirable properties and are good gate electrode candidates for future metal-oxide-semiconductor (MOS) device applications. Moreover, Ru and RuO2 are promising candidates as diffusion barriers for copper interconnects. In this thesis, the thermal stability and interfacial diffusion and reaction of both Ru and RuO2 thin films on HfO2 gate dielectrics were investigated using Rutherford backscattering spectrometry (RBS), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). An overview of Ru and RuO2/HfO2 interface integrity issues will be presented. In addition, the effects of C ion modification of RuO2 thin films on the physico-chemical and electrical properties are evaluated.
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Maternal employment: Factors related to role strain.

Maternal employment: Factors related to role strain.

Date: August 2009
Creator: LoCascio, Stephanie
Description: Past literature suggests that working mothers are at an increased risk for experiencing role strain compared to other employed adults. The current study investigated attitudes and beliefs of 783 working mothers of 15-month-old children using data from the National Institute of Child Health and Human Development's Study of Early Child Care and Youth Development. Working mothers' levels of role strain was associated with perceived social support, attitudes toward maternal employment, job and parental role quality, financial stress, and depression. Negative attitudes toward maternal employment predicted maternal separation anxiety, while positive attitudes toward employment did not affect separation anxiety. These findings have implications for the importance of decreasing role strain in working mothers.
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Math literacy: The relationship of algebra, gender, ethnicity, socioeconomic status, and AVID enrollment with high school math course completion and college readiness.

Math literacy: The relationship of algebra, gender, ethnicity, socioeconomic status, and AVID enrollment with high school math course completion and college readiness.

Date: August 2009
Creator: Edge, Donna L.
Description: The questions guiding this research seek to discover the factors that affect high school math course completion and college readiness in a Texas suburban public school district. The first research question examines the relationship between 8th grade completion of Algebra I and high school mathematics course taking patterns and college readiness. The second question evaluates the relationship between race, gender, socioeconomic status and enrollment in the Advancement Via Individual Determination (AVID) program to college math readiness and high school mathematics course completion. Participants included 841 high school graduates of the class of 2006; 76% of the graduates were White, 15% Hispanic and 7% African American. Twenty-three percent of students were economically disadvantaged and 46% of students completed Algebra I in 8th grade. Chi-square, Cramer's V, and multiple regression were conducted to evaluate possible relationships between variables. The Chi-square and Cramer's V showed statistically significant (p<.05) relationships between 8th grade algebra completion and both college readiness and high school math course completion. A significant statistical relationship was also found between college readiness and each of the independent variables, ethnicity, economic status, completion of 8th grade algebra and enrollment in AVID. The number of math courses completed in high school was statistically ...
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Mathematical Modeling of Charged Liquid Droplets: Numerical Simulation and Stability Analysis

Mathematical Modeling of Charged Liquid Droplets: Numerical Simulation and Stability Analysis

Date: May 2006
Creator: Vantzos, Orestis
Description: The goal of this thesis is to study of the evolution of 3D electrically charged liquid droplets of fluid evolving under the influence of surface tension and electrostatic forces. In the first part of the thesis, an appropriate mathematical model of the problem is introduced and the linear stability analysis is developed by perturbing a sphere with spherical harmonics. In the second part, the numerical solution of the problem is described with the use of the boundary elements method (BEM) on an adaptive mesh of triangular elements. The numerical method is validated by comparison with exact solutions. Finally, various numerical results are presented. These include neck formation in droplets, the evolution of surfaces with holes, singularity formation on droplets with various symmetries and numerical evidence that oblate spheroids are unstable.
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Mathematics Anxiety and Mathematics Self-efficacy in Relation to Medication Calculation Performance in Nurses

Mathematics Anxiety and Mathematics Self-efficacy in Relation to Medication Calculation Performance in Nurses

Date: May 2012
Creator: Melius, Joyce
Description: The purpose of this study is to identify and analyze the relationships that exist between mathematics anxiety and nurse self-efficacy for mathematics, and the medication calculation performance of acute care nurses. This research used a quantitative correlational research design and involved a sample of 84 acute care nurses, LVNs and RNs, from a suburban private hospital. the participants filled out a Mathematics Anxiety Scale, a Nurse Self-Efficacy for Mathematics Scale and also completed a 20-item medication calculation test. Significant practical and statistical relationships were discovered between the variables utilizing multiple linear regression statistics and commonality analysis. As the Nurse’s Mathematics anxiety score increased the scores on the medication test decreased and the scores on nurse self-efficacy for mathematics scale also decreased. the demographic item of “Hours a nurse worked in one week” had the greatest significance. the more hours a nurse worked the lower their score was on the medication calculation test. This study agrees with others that nurses are not good at mathematics. This study also correlated that as the number of hours worked increased so did the medication calculations errors. and many nurses have a measurable level of anxiety about mathematics and dosage calculations and this may influence ...
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Matlab Implementation of a Tornado Forward Error Correction Code

Matlab Implementation of a Tornado Forward Error Correction Code

Date: May 2011
Creator: Noriega, Alexandra
Description: This research discusses how the design of a tornado forward error correcting channel code (FEC) sends digital data stream profiles to the receiver. The complete design was based on the Tornado channel code, binary phase shift keying (BPSK) modulation on a Gaussian channel (AWGN). The communication link was simulated by using Matlab, which shows the theoretical systems efficiency. Then the data stream was input as data to be simulated communication systems using Matlab. The purpose of this paper is to introduce the audience to a simulation technique that has been successfully used to determine how well a FEC expected to work when transferring digital data streams. The goal is to use this data to show how FEC optimizes a digital data stream to gain a better digital communications systems. The results conclude by making comparisons of different possible styles for the Tornado FEC code.
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A Matter of Due Process: An Examination of How State Mandated Accreditation has Impacted Texas Crime Laboratories

A Matter of Due Process: An Examination of How State Mandated Accreditation has Impacted Texas Crime Laboratories

Date: May 2008
Creator: DeLillo, Sandy Dawn
Description: Mandated accreditation of crime laboratories is a fairly new phenomenon. The state of Texas was the first to require that crime laboratories be accredited in order to be able to present evidence in a criminal proceeding. The laws that govern this are Texas House Bill 2703 and Texas House Bill 1068. The goal of this study is see how the enactment of these laws impacted crime laboratories. There are 42 crime laboratories that are accredited in the state of Texas. This study was conducted by the use of telephone survey interviews. Results indicated that mandated accreditation is a step in the right direction to ensure that objectivity is maintained during the processing and evaluation of physical evidence.
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A Matter of Life and Death: The Continuity of Identity in the Fiction of Edgar Allan Poe

A Matter of Life and Death: The Continuity of Identity in the Fiction of Edgar Allan Poe

Date: August 1972
Creator: Hayes, Kathryn Janette
Description: Some of the most interesting facets of Edgar Allan Poe's fiction are his imaginative speculations concerning the metaphysical experiences of the soul, the individual psychic "identity." His interest focuses primarily on three related aspects of the soul's experiences (1) metempsychosis (or reincarnation and transmigration); (2) suspension between "death" and the after-life or states of unconsciousness and consciousness, sleep and waking; and (3) the terrors, real or imagined, of premature burial.
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The Matters of Troy and Thebes and Their Role in a Critique of Courtly Life in Chaucer and the Gawain-Poet

The Matters of Troy and Thebes and Their Role in a Critique of Courtly Life in Chaucer and the Gawain-Poet

Date: May 1999
Creator: Jones, Oliver M.
Description: Both Chaucer and the Gawain-poet use the Matters of Troy and Thebes as material for a critique of courtly life, applying these literary matters to the events and actions in and around Ricardian England. They use these classical matters to express concerns about the effectiveness of the court of Richard II. Chaucer uses his earlier works as a testing ground to develop his views about the value of duty over courtly pursuits, ideas discussed more completely in Troilus and Criseyde. The Gawain-poet uses the Matter of Troy coupled with the court of King Arthur to engage in a critique of courtly concerns. The critiques presented by both poets show a tendency toward duty over courtly concerns.
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