Marital and Social Changes in the Lives of Women who Complete the Ph.D. Degree at Midlife

Marital and Social Changes in the Lives of Women who Complete the Ph.D. Degree at Midlife

Date: August 1995
Creator: Sikes, Debra
Description: The percentage of women who receive doctorates has increased by over 300 percent during the past three decades. The consequences of pursuing the Ph.D. degree have always been far reaching and profound, serving as an impetus and springboard for the reconfiguration of one's beliefs, values, and professional life. The purposes of this national study were to ascertain and describe marital and social changes that occurred in the lives of women who were awarded the Ph.D. degree at midlife. A questionnaire was distributed to a sample of three-hundred women who hold the Ph.D. degree and were employed in institutions of higher education in the United States. The study sought to identify the effects of the Ph.D. experience upon the marital relationships, friendships, and social activities of women who completed the degree between the ages of thirty-five and forty-five. Demographic data were collected which were related to their marital status before, during, and after the Ph.D. experience. Both closed and open-ended questions were posed which solicited information pertaining to their post Ph.D. experience. This research reports both quantitative and qualitative findings. The majority of women who complete the Ph.D. experience at midlife undergo and initiate changes in their lives which impact their ...
Contributing Partner: UNT Libraries
Retention and Attrition of Doctoral Candidates in Higher Education

Retention and Attrition of Doctoral Candidates in Higher Education

Date: December 2000
Creator: Malmberg, Eric D.
Description: A number of studies have been conducted on the attrition rates of undergraduate and graduate students. However, the body of knowledge concerning attrition for doctoral students, especially those who have attained the level of “all but dissertation” (ABD), is limited. The purpose of this research was to examine retention and attrition factors of doctoral candidates from a typical Higher Education Doctoral Program (Research II Public Institution) who were admitted to candidacy from 1991 through July 2000. Participation of the subject population was limited to those who had attained the level of ABD--those who had previously fulfilled the residency, coursework, foreign language or tool-subject requirements, and successfully completed the comprehensive/qualifying exams. This population included current ABDs, previously attrited ABDs, and graduates of the degree program. The research study was qualitative and intended to identify the effect of specific, predetermined factors that may have influenced or affected the progress of current, previous, and graduated students towards the doctoral degree in higher education. This study obtained responses to questions from the questionnaire/survey instrument concerning factors that affected program completion or attrition. Students had the opportunity to elaborate on factors from their dissertation, advisement, and personal, financial, and employment experiences that affected their ability ...
Contributing Partner: UNT Libraries
What makes a quality Ph.D. program in library and information sciences?

What makes a quality Ph.D. program in library and information sciences?

Date: December 2006
Creator: Klingler, Scott Lavell
Description: The intent of this study was to establish and validate criteria for use to assess the quality of a library and information sciences (LIS) Ph.D. program. The Ph.D. student-centric topology for quality Ph.D. programs was developed from a 2001 position statement by the American Association of Colleges of Nursing (AACN) regarding the quality indicators in research-focused doctoral programs in nursing. Topology components were tested using a survey instrument to establish their importance to the community of practice and their potential use to assess a Ph.D. program. Survey participants were asked to rank terms or concepts in a balanced incomplete block (BIB) design then rate, on a Likert-type scale, statements about the applicability of these terms or concepts to assessing a quality LIS Ph.D. program. Survey participants were from the Association for Library and Information Science Education (ALISE) Open Lib/Info Sci Education Forum jESSE Listserv. Of 225 survey participants affiliated with universities or schools from North America who submitted usable surveys, slightly less than two-thirds (64.4 %) were female while 35.5 % were male. Ninety-eight participants (43.6 %) were faculty, 114 (50.7 %) were Ph.D. students or candidates, and 13 (5.8 %) were in other roles. Statistical analysis of survey responses ...
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Methods for Determining the Energy Release in Hypothetical Reactor Meltdown Accidents

Methods for Determining the Energy Release in Hypothetical Reactor Meltdown Accidents

Date: December 1962
Creator: Nicholson, Richard Benjamin
Description: Report and dissertation issued by the APDA over hypothetical reactor meltdown accidents. Methods for the determination of the energy release from reactor meltdowns are presented. This report includes tables, and illustrations.
Contributing Partner: UNT Libraries Government Documents Department
The Mass Transfer of Single, Solid Uranium Spheres to Flowing Molten Cadmium in Laminar and Turbulent Flow

The Mass Transfer of Single, Solid Uranium Spheres to Flowing Molten Cadmium in Laminar and Turbulent Flow

Date: September 1965
Creator: Traylor, E. Dean
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Two-Phase Heat Transfer With Gas Injection Through A Porous Boundary Surface

Two-Phase Heat Transfer With Gas Injection Through A Porous Boundary Surface

Date: March 1964
Creator: Kudirka, A. A.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Propagation of Density Disturbances in Air-Water Flow

Propagation of Density Disturbances in Air-Water Flow

Date: June 1965
Creator: Nassos, George P.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Two-Phase Air-Water Flow Phenomena

Two-Phase Air-Water Flow Phenomena

Date: March 1958
Creator: Petrick, Michael
Description: Report issued by the Argonne National Laboratory discussing two-phase flow studies that were conducted "to obtain empirical density relationships and pressure drop friction factors for two-phase mixtures" (p. 11). This report includes tables, illustrations, and photographs.
Contributing Partner: UNT Libraries Government Documents Department
An Investigation of Instabilities Encountered During Heat Transfer to a Supercritical Fluid

An Investigation of Instabilities Encountered During Heat Transfer to a Supercritical Fluid

Date: April 1965
Creator: Cornelius, Archie Junior
Description: Report concerning "the unstable behavior of a heat-transfer loop operating at a super-critical pressure (p. 7)" within a nuclear reactor.
Contributing Partner: UNT Libraries Government Documents Department
Separation of Azeotropes by Means of Diffusion through Porous Membranes

Separation of Azeotropes by Means of Diffusion through Porous Membranes

Date: October 1953
Creator: Hagerbaumer, Donald H.
Description: Thesis discussing experiments to separate azeotropes into pure components testing eleven minimum boiling point azeotropic systems: (1) acetone-methanol, (2) carbon tetrachloride-ethyl acetate, (3) cyclohexane-ethanol, (4) benzene-isopropanol, (5) benzene-n-propanol, (6) benzene-cyclohexane, (7) benzene-methanol, (8) benzene-ethanol, (9) acetone-carbon, (10) isopropoanol-water, and (11) ethanol-water.
Contributing Partner: UNT Libraries Government Documents Department
First observation of the decay B bar 0s -->; D+-s K-+ and measurement of Br(B bar 0s -->; D+-sK-+)/Br(B bar 0s -->; D+s pi-)

First observation of the decay B bar 0s -->; D+-s K-+ and measurement of Br(B bar 0s -->; D+-sK-+)/Br(B bar 0s -->; D+s pi-)

Date: November 15, 2007
Creator: Muelmenstaedt, Johannes & Muelmenstaedt, Johannes
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The Technology of Slate

The Technology of Slate

Date: 1922
Creator: Bowles, Oliver
Description: From Introduction: "The purpose of this bulletin is to point out the most efficient methods and equipment now in use in slate quarries, to describe methods of utilizing the quarried material to best advantage, and to outline means of reducing the proportion of waste, which is now excessive."
Contributing Partner: UNT Libraries Government Documents Department
Condensation of Metal Vapors: Mercury and the Kinetic Theory of Condensation

Condensation of Metal Vapors: Mercury and the Kinetic Theory of Condensation

Date: October 1964
Creator: Wilhelm, Donald J.
Description: Report issued by the Argonne National Laboratory discussing condensation theories of metal vapors. As stated in the introduction, "the objectives of this research then are critical analysis of condensation theories and data for metal vapors and experimental evaluation of the resistance to condensation for a representative metal such as mercury" (p. 18). This report includes tables, illustrations, and photographs.
Contributing Partner: UNT Libraries Government Documents Department
Dynamic Analysis of Coolant Circulation in Boiling Water Nuclear Reactors

Dynamic Analysis of Coolant Circulation in Boiling Water Nuclear Reactors

Date: April 1964
Creator: Sanathanan, Chathilingath K.
Description: Report concerning the study of the two-phase flow through the cooling channels of a natural-circulation boiling water nuclear reactor. "One-dimensional conservation equations describing the flow through each channel are written in the linearized perturbed form, and Laplace transformation in time is performed." (p. 5)
Contributing Partner: UNT Libraries Government Documents Department
Frequency-Response Analysis of Steam Voids to Sinusoidal Power Modulation in a Thin-Walled Boiling Water Coolant Channel

Frequency-Response Analysis of Steam Voids to Sinusoidal Power Modulation in a Thin-Walled Boiling Water Coolant Channel

Date: May 1965
Creator: St. Pierre, Carl C.
Description: Report regarding a study with the primary objective of acquiring "experimental data on power-to-void transfer functions for a single rectangular flow channel at elevated pressures" (p. 9).
Contributing Partner: UNT Libraries Government Documents Department
Analytical and Experimental Investigation of a Nuclear Reactor Support Structure

Analytical and Experimental Investigation of a Nuclear Reactor Support Structure

Date: March 1965
Creator: Marchertas, A. H.; Fistedis, S. H. & Brittan, R. O.
Description: Report containing experiments regarding the slopes and deflections of different grid support structures for a nuclear reactor.
Contributing Partner: UNT Libraries Government Documents Department
Comparative Study of Perceived Barriers to Faculty Participation in Distance Education at a Four-Year University

Comparative Study of Perceived Barriers to Faculty Participation in Distance Education at a Four-Year University

Date: May 2016
Creator: Bailey, Elizabeth
Description: Bailey, Elizabeth, Comparative study of perceived barriers to faculty participation in distance education at a four-year university. Doctor of Philosophy (Education), December 2015, 103 pp., 21 tables, references. The purpose of this Bailey study was to identify perceived barriers of faculty participation in distance education courses in a four-year university and identify the differences in perceived barriers between the Hebert 2003 study and this Bailey study. The literature review covers numerous studies and articles written within the last 10 years that are related to a variety of barriers perceived by faculty and administrators. There were no statistically significant relationships found between faculty demographics including gender, age, position at the university, tenure status, and number of years faculty have taught in post-secondary education. There were no statistically significant relationships found between the top administrator-ranked motivators and corresponding faculty-ranked motivators, nor between the top administrator-ranked inhibitors and the corresponding faculty-ranked inhibitors. Out of the top four non-participating, faculty-ranked barriers, three were found to have statistically significant relationships with the corresponding administrator-ranked barriers. Statistically significant relationships were found between the faculty-ranked motivators and corresponding administrator identified motivators and between the top ranked barriers identified by non-participating faculty and administrators in Hebert’s study compared ...
Contributing Partner: UNT Libraries
Photoexcitation in Superconductors

Photoexcitation in Superconductors

Date: June 1976
Creator: Schuller, Ivan
Description: Dissertation discussing the results of experiments to study the behavior of superconductors under light illumination.
Contributing Partner: UNT Libraries Government Documents Department
A Measurement of the Top Quark Mass in 1.96 TeV Proton-Antiproton Collisions Using a Novel Matrix Element Method

A Measurement of the Top Quark Mass in 1.96 TeV Proton-Antiproton Collisions Using a Novel Matrix Element Method

Date: September 30, 2007
Creator: CDF Collaboration
Description: A measurement of the top quark mass in t{bar t} {yields} l + jets candidate events, obtained from p{bar p} collisions at {radical}s = 1.96 TeV at the Fermilab Tevatron using the CDF II detector, is presented. The measurement approach is that of a matrix element method. For each candidate event, a two dimensional likelihood is calculated in the top pole mass and a constant scale factor, 'JES', where JES multiplies the input particle jet momenta and is designed to account for the systematic uncertainty of the jet momentum reconstruction. As with all matrix element techniques, the method involves an integration using the Standard Model matrix element for t{bar t} production and decay. However, the technique presented is unique in that the matrix element is modified to compensate for kinematic assumptions which are made to reduce computation time. Background events are dealt with through use of an event observable which distinguishes signal from background, as well as through a cut on the value of an event's maximum likelihood. Results are based on a 955 pb{sup -1} data sample, using events with a high-p{sub T} lepton and exactly four high-energy jets, at least one of which is tagged as coming from ...
Contributing Partner: UNT Libraries Government Documents Department
Latino success stories in higher education: A qualitative study of recent graduates from a health science center.

Latino success stories in higher education: A qualitative study of recent graduates from a health science center.

Date: May 2007
Creator: Colley, Kay Lynne
Description: This study used qualitative research, particularly life history analysis, to determine the personal pathways of success for Latino students who chose to enter a health science center for graduate study and who graduated. By giving voice to individual success stories of Latino students, some of the influences on the life pathways of these graduates were determined. For the purposes of this study, success was defined as graduation from a health science center with either a doctor of philosophy, doctor of public health or doctor of osteopathic medicine degree. Four research subjects agreed to participate in this study from a possible 11 students from the graduating class of 2004-2005 at this health science center. Data were gathered through multiple in-depth interviews of the students themselves over a period of no more than one month for each participant. Data were analyzed using the mind mapping technique and Padilla's unfolding matrix. Findings indicate that each participant traveled a different pathway to achieve educational success although similarities did exist across participants. The influences of family background, cultural background, educational background and personal perceptions and goals did affect the pathways of these four Latino graduates. While three of four participants indicated that family was the ...
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Intense Ion Beam for Warm Dense Matter Physics

Intense Ion Beam for Warm Dense Matter Physics

Date: May 23, 2008
Creator: Coleman, Joshua Eugene
Description: The Neutralized Drift Compression Experiment (NDCX) at Lawrence Berkeley National Laboratory is exploring the physical limits of compression and focusing of ion beams for heating material to warm dense matter (WDM) and fusion ignition conditions. The NDCX is a beam transport experiment with several components at a scale comparable to an inertial fusion energy driver. The NDCX is an accelerator which consists of a low-emittance ion source, high-current injector, solenoid matching section, induction bunching module, beam neutralization section, and final focusing system. The principal objectives of the experiment are to control the beam envelope, demonstrate effective neutralization of the beam space-charge, control the velocity tilt on the beam, and understand defocusing effects, field imperfections, and limitations on peak intensity such as emittance and aberrations. Target heating experiments with space-charge dominated ion beams require simultaneous longitudinal bunching and transverse focusing. A four-solenoid lattice is used to tune the beam envelope to the necessary focusing conditions before entering the induction bunching module. The induction bunching module provides a head-to-tail velocity ramp necessary to achieve peak axial compression at the desired focal plane. Downstream of the induction gap a plasma column neutralizes the beam space charge so only emittance limits the focused beam ...
Contributing Partner: UNT Libraries Government Documents Department
Odd-Z Transactinide Compound Nucleus Reactions Including the Discovery of 260Bh

Odd-Z Transactinide Compound Nucleus Reactions Including the Discovery of 260Bh

Date: May 14, 2008
Creator: Nelson, Sarah L & Nelson, Sarah L
Description: Several reactions producing odd-Z transactinide compound nuclei were studiedwith the 88-Inch Cyclotron and the Berkeley Gas-Filled Separator at the LawrenceBerkeley National Laboratory. The goal was to produce the same compound nucleus ator near the same excitation energy with similar values of angular momentum via differentnuclear reactions. In doing so, it can be determined if there is a preference in entrancechannel, because under these experimental conditions the survival portion of Swiatecki, Siwek-Wilcznska, and Wilczynski's"Fusion By Diffusion" model is nearly identical forthe two reactions. Additionally, because the same compound nucleus is produced, theexit channel is the same. Four compound nuclei were examined in this study: 258Db, 262Bh, 266Mt, and 272Rg. These nuclei were produced by using very similar heavy-ion induced-fusion reactions which differ only by one proton in the projectile or target nucleus (e.g.: 50Ti + 209Bi vs. 51V + 208Pb). Peak 1n exit channel cross sections were determined for each reaction in each pair, and three of the four pairs' cross sections were identical within statistical uncertainties. This indicates there is not an obvious preference of entrancechannel in these paired reactions. Charge equilibration immediately prior to fusionleading to a decreased fusion barrier is the likely cause of this phenomenon. In addition ...
Contributing Partner: UNT Libraries Government Documents Department
Bayesian based design of real-time sensor systems for high-risk indoor contaminants

Bayesian based design of real-time sensor systems for high-risk indoor contaminants

Date: December 1, 2007
Creator: Sreedharan, Priya & Sreedharan, Priya
Description: The sudden release of toxic contaminants that reach indoor spaces can be hazardousto building occupants. To respond effectively, the contaminant release must be quicklydetected and characterized to determine unobserved parameters, such as release locationand strength. Characterizing the release requires solving an inverse problem. Designinga robust real-time sensor system that solves the inverse problem is challenging becausethe fate and transport of contaminants is complex, sensor information is limited andimperfect, and real-time estimation is computationally constrained.This dissertation uses a system-level approach, based on a Bayes Monte Carloframework, to develop sensor-system design concepts and methods. I describe threeinvestigations that explore complex relationships among sensors, network architecture,interpretation algorithms, and system performance. The investigations use data obtainedfrom tracer gas experiments conducted in a real building. The influence of individual sensor characteristics on the sensor-system performance for binary-type contaminant sensors is analyzed. Performance tradeoffs among sensor accuracy, threshold level and response time are identified; these attributes could not be inferred without a system-level analysis. For example, more accurate but slower sensors are found to outperform less accurate but faster sensors. Secondly, I investigate how the sensor-system performance can be understood in terms of contaminant transport processes and the model representation that is used to solve the ...
Contributing Partner: UNT Libraries Government Documents Department
Extreme ultraviolet lithography: A few more pieces of the puzzle

Extreme ultraviolet lithography: A few more pieces of the puzzle

Date: May 20, 2009
Creator: Anderson, Christopher N.
Description: The work described in this dissertation has improved three essential components of extreme ultraviolet (EUV) lithography: exposure tools, photoresist, and metrology. Exposure tools. A field-averaging illumination stage is presented that enables nonuniform, high-coherence sources to be used in applications where highly uniform illumination is required. In an EUV implementation, it is shown that the illuminator achieves a 6.5% peak-to-valley intensity variation across the entire design field of view. In addition, a design for a stand-alone EUV printing tool capable of delivering 15 nm half-pitch sinusoidal fringes with available sources, gratings and nano-positioning stages is presented. It is shown that the proposed design delivers a near zero line-edge-rougness (LER) aerial image, something extremely attractive for the application of resist testing. Photoresist. Two new methods of quantifying the deprotection blur of EUV photoresists are described and experimentally demonstrated. The deprotection blur, LER, and sensitivity parameters of several EUV photoresists are quantified simultaneously as base weight percent, photoacid generator (PAG) weight percent, and post-exposure bake (PEB) temperature are varied. Two surprising results are found: (1) changing base weight percent does not significantly affect the deprotection blur of EUV photoresist, and (2) increasing PAG weight percent can simultaneously reduce LER and E-size in EUV ...
Contributing Partner: UNT Libraries Government Documents Department
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