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Laboratory Directed Research and Development FY2002 Annual Report
None
Date:
May 2, 2003
Creator:
Al-Ayat, R
Object Type:
Report
System:
The UNT Digital Library
Financial Transfer and Its Impact on the Level of Democracy: A Pooled Cross-Sectional Time Series Model.
This dissertation is a pooled time series, cross-sectional, quantitative study of the impact of international financial transfer on the level of democracy. The study covers 174 developed and developing countries from 1976 through 1994. Through evaluating the democracy and democratization literature and other studies, the dissertation develops a theory and testable hypotheses about the impact of the international variables foreign aid and foreign direct investment on levels of democracy. This study sought to determine whether these two financial variables promote or nurture democracy and if so, how? A pooled time-series cross-sectional model is developed employing these two variables along with other relevant control variables. Control variables included the presence of the Cold War and existence of formal alliance with the United States, which account for the strategic dimension that might affect the financial transfer - level of democracy linkage. The model also includes an economic development variable (per capita Gross National Product) to account for the powerful impact for economic development on the level of democracy, as well as a control for each country's population size. By addressing and the inclusion of financial, economic, strategic, and population size effects, I consider whether change in these variables affect the level of …
Date:
May 2003
Creator:
Al-Momani, Mohammad H.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Comparisons of Improvement-Over-Chance Effect Sizes for Two Groups Under Variance Heterogeneity and Prior Probabilities
The distributional properties of improvement-over-chance, I, effect sizes derived from linear and quadratic predictive discriminant analysis (PDA) and from logistic regression analysis (LRA) for the two-group univariate classification were examined. Data were generated under varying levels of four data conditions: population separation, variance pattern, sample size, and prior probabilities. None of the indices provided acceptable estimates of effect for all the conditions examined. There were only a small number of conditions under which both accuracy and precision were acceptable. The results indicate that the decision of which method to choose is primarily determined by variance pattern and prior probabilities. Under variance homogeneity, any of the methods may be recommended. However, LRA is recommended when priors are equal or extreme and linear PDA is recommended when priors are moderate. Under variance heterogeneity, selecting a recommended method is more complex. In many cases, more than one method could be used appropriately.
Date:
May 2003
Creator:
Alexander, Erika D.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Oral History Interview with John J. Clemens, May 13, 2003
Access:
Use of this item is restricted to the UNT Community
Interview with John J. Clemens. The interview includes Clemens' personal experiences about childhood and early adulthood in Houston, Texas, World War II-era service in the U.S. Navy, serving aboard USS Wren in the Pacific Theater, and piloting a ship into Tokyo Bay immediately following the Japanese surrender. Clemens speaks about convoy missions across the Atlantic Ocean, the January 4, 1944 sinking of the USS Turner while moored in New York Harbor and the court of inquiry regarding the sinking, actions in the Aleutian Islands, Attu, Okinawa, and Philippine campaigns and anti-kamikaze warfare while aboard the USS Wren, and the effects that Allied bombing had on Tokyo.
Date:
May 13, 2003
Creator:
Alexander, William J. & Clemens, John J., 1921-
Object Type:
Book
System:
The UNT Digital Library
Masking Meaning
Chapter I describes the purpose of the project, which was to develop a body of work that exhibits my current thought process. The questions presented to myself consisted of the following: 1. How effective was the expression of my ideas socially and politically after the change to the work? 2. Was the minimal approach a tool that contributes or detracts from this effectiveness? 3. Did an increase in scale successfully act as an element of confrontation? Chapter II describes the inspiration behind the making of my work it also discusses problems encountered with an understanding of the viewer concerning imagery. Chapter III summarizes the methodology behind the execution of the new body of work. It also discusses how simplification of imagery works as a solution to my problems.
Date:
May 2003
Creator:
Allee, Jake R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Synchrotron Studies of Narrow Band and Low-Dimensional Materials. Final Report for July 1, 1990---December 31, 2002
This report summarizes a 12-year program of various kinds of synchrotron spectroscopies directed at the electronic structures of narrow band and low-dimensional materials that display correlated electron behaviors such as metal-insulator transitions, mixed valence, superconductivity, Kondo moment quenching, heavy Fermions, and non-Fermi liquid properties.
Date:
May 13, 2003
Creator:
Allen, J. W.
Object Type:
Report
System:
The UNT Digital Library
The First Day of a New Congress: A Guide to Proceedings on the House Floor
This report focuses on the floor activities of the House during its first formal session in a new Congress, and serves as a guide for participating in or watching these proceedings.
Date:
May 23, 2003
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Membership of the 108th Congress: A Profile
None
Date:
May 8, 2003
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Resource Efficient and Scalable Routing using Intelligent Mobile Agents
Many of the contemporary routing algorithms use simple mechanisms such as flooding or broadcasting to disseminate the routing information available to them. Such routing algorithms cause significant network resource overhead due to the large number of messages generated at each host/router throughout the route update process. Many of these messages are wasteful since they do not contribute to the route discovery process. Reducing the resource overhead may allow for several algorithms to be deployed in a wide range of networks (wireless and ad-hoc) which require a simple routing protocol due to limited availability of resources (memory and bandwidth). Motivated by the need to reduce the resource overhead associated with routing algorithms a new implementation of distance vector routing algorithm using an agent-based paradigm known as Agent-based Distance Vector Routing (ADVR) has been proposed. In ADVR, the ability of route discovery and message passing shifts from the nodes to individual agents that traverse the network, co-ordinate with each other and successively update the routing tables of the nodes they visit.
Date:
May 2003
Creator:
Amin, Kaizar Abdul Husain
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Comparative Analysis of Management and Employee Job Satisfaction and Policy Perceptions.
The purpose of the study was to investigate the perceptions of job satisfaction as defined by management and nonmanagement employees and to compare both parties' perceptions of organizational benefits to a list prepared by the organization's benefit personnel. Turnover is costly to the organization, both in money and in the impact it has on those individuals remaining with the organization. Every effort should be undertaken to reduce the amount of turnover within the organization. A contributing factor leading to turnover may be a gap between what the employees believe is important to them and what management believes is important to the employees. The boundaries of the gap need to be identified before any effort can be made to reduce or bridge the gap. Once the boundaries are identified, policies can be analyzed and the possibility of reducing the gap investigated. Management as a whole must be aware of the needs and wants of their employees before any attempt to develop a retention strategy is undertaken. This knowledge can be acquired only through two-way communication with the employee. The communication process includes the simple process of asking employees for this information and then listening to how they respond. This study suggests …
Date:
May 2003
Creator:
Andrews, Charles G.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Effect of Airflow and Heat Input Rates on Duct Efficiency.
Reducing the airflow and heat input rates of a furnace that is connected to a duct system in thermal contact with unconditioned spaces can significantly reduce thermal distribution efficiency. This is a straightforward theoretical calculation based on the increased residence time of the air in the duct at the lower flow rate, which results in greater conduction losses. Experimental tests in an instrumented residential-size duct system have confirmed this prediction. Results are compared with the heat-loss algorithm in ASHRAE Standid 152P. The paper concludes with a discussion of possible remedies for this loss of efficiency in existing systems and optional design strategies in new construction.
Date:
May 28, 2003
Creator:
Andrews, J. W.
Object Type:
Report
System:
The UNT Digital Library
Laboratory Evaluation of the Delta Q Test for Duct Leakage
Using a residential-size duct system in a controlled laboratory setting, the repeatability and accuracy of the Delta Q test for air leakage in residential duct systems have been measured. More than 100 Delta Q tests were performed. These were compared with results using fan pressurization and also with results of a procedure (Delta Q Plus) that uses leakage hole-size information to select the leakage pressures to be used in the Delta Q algorithm. The average error in supply or return leakage for the fan-pressurization test was 6.4% of system fan flow. For the Delta Q test it was 3.4% of fan flow, while for Delta Q Plus it was 1.9% of fan flow.
Date:
May 1, 2003
Creator:
Andrews, J. W.
Object Type:
Report
System:
The UNT Digital Library
Content-Based Image Retrieval by Integration of Metadata Encoded Multimedia Features in Constructing a Video Summarizer Application.
Content-based image retrieval (CBIR) is the retrieval of images from a collection by means of internal feature measures of the information content of the images. In CBIR systems, text media is usually used only to retrieve exemplar images for further searching by image feature content. This research work describes a new method for integrating multimedia text and image content features to increase the retrieval performance of the system. I am exploring the content-based features of an image extracted from a video to build a storyboard for search retrieval of images. Metadata encoded multimedia features include extracting primitive features like color, shape and text from an image. Histograms are built for all the features extracted and stored in a database. Images are searched based on comparing these histogram values of the extracted image with the stored values. These histogram values are used for extraction of keyframes from a collection of images parsed from a video file. Individual shots of images are extracted from a video clip and run through processes that extract the features and build the histogram values. A keyframe extraction algorithm is run to get the keyframes from the collection of images to build a storyboard of images. In …
Date:
May 2003
Creator:
Anusuri, Ramprasad
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Simultaneous Energy Savings and IEQ Improvements in Relocatable Classrooms
Relocatable classrooms (RCs) are commonly used by school districts with changing demographics and enrollment sizes. We designed and constructed four energy-efficient RCs for this study to demonstrate technologies with the potential to simultaneously improve energy efficiency and indoor environmental quality (IEQ). Two were installed at each of two school districts, and energy use and IEQ parameters were monitored during occupancy. Two RCs (one per school) were finished with materials selected for reduced emissions of toxic and odorous volatile organic compounds (VOCs). Each had two HVAC systems, operated on alternate weeks, consisting of a standard heat-pump system and an indirect-direct evaporative cooling (IDEC) system with gas-fired hydronic heating. The IDEC system provides continuous outside air ventilation at {sup 3}15 CFM (7.5 L s-1) person-1, efficient particle filtration while using significantly less energy for cooling. School year long measurements included: carbon dioxide (CO2), particles, VOCs, temperature, humidity, thermal comfort, noise, meteorology, and energy use. IEQ monitoring results indicate that important ventilation-relevant indoor CO2 and health-relevant VOC concentration reductions were achieved while average cooling and heating energy costs were simultaneously reduced by 50 percent and 30 percent, respectively.
Date:
May 22, 2003
Creator:
Apte, Michael G.; Dibartolomeo, Dennis; Hotchi, Toshi; Hodgson, Alfred T.; Lee, Seung-Min; Liff, Shawna M. et al.
Object Type:
Report
System:
The UNT Digital Library
The Effects of Biofeedback and Verbal Feedback on the Training and Maintenance of Diaphragmatic Breathing
The purpose of this study was to evaluate the effects of a computer program on the training and maintenance of diaphragmatic breathing. The biofeedback portion was visual computer training and the results were displayed concurrently with participants' breathing responses to monitor display. The verbal feedback portion was praise that was given and recorded when participants responded with predominantly diaphragmatic breathing at the scheduled moment and response instruction that was given when participants responded with predominantly thoracic breathing. The results of this study indicate the computer program's effectiveness needs to be increased by supplementation with verbal feedback.
Date:
May 2003
Creator:
Armstrong, Earl E.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Interfacial Electrochemistry of Metal Nanoparticles Formation on Diamond and Copper Electroplating on Ruthenium Surface
Access:
Use of this item is restricted to the UNT Community
An extremely facile and novel method called spontaneous deposition, to deposit noble metal nanoparticles on a most stable form of carbon (C) i.e. diamond is presented. Nanometer sized particles of such metals as platinum (Pt), palladium (Pd), gold (Au), copper (Cu) and silver (Ag) could be deposited on boron-doped (B-doped) polycrystalline diamond films grown on silicon (Si) substrates, by simply immersing the diamond/Si sample in hydrofluoric acid (HF) solution containing ions of the corresponding metal. The electrons for the reduction of metal ions came from the Si back substrate. The diamond/Si interfacial ohmic contact was of paramount importance to the observation of the spontaneous deposition process. The metal/diamond (M/C) surfaces were investigated using Raman spectroscopy, scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS) and x-ray diffractometry (XRD). The morphology (i.e. size and distribution) of metal nanoparticles deposits could be controlled by adjusting the metal ion concentration, HF concentration and deposition time. XRD data indicate the presence of textured and strained crystal lattices of Pd for different Pd/C morphologies, which seem to influence the electrocatalytic oxidation of formaldehyde (HCHO). The sensitivity of electrocatalytic reactions to surface crystal structure implies that M/C could be fabricated for specific electrocatalytic applications. The research also …
Date:
May 2003
Creator:
Arunagiri, Tiruchirapalli Natarajan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Eliminating a Major Cause of Wire Drawing Breakage in A-15 High-Field Superconductors
Eliminating a Major Cause of Wire Drawing Breakage in A-15 High-Field Superconductors Phase 1 Summary Purpose of the research: The Phase 1 goal was to make a significant improvement in the wire drawing technology used for difficult to draw superconductor precursor composites. Many ductile Nb-Al and Nb-Sn precursor wire composites have experienced the onset of wire drawing breakage at about 1.5 mm diameter. Phase 1 focused on evaluating the role that precision rigid guidance of the wire into the drawing die and the hydrostatic stress state at the die entrance played in preventing wire breakage. Research carried out: The research performed depended upon the construction of both a mechanical wire guide and a hydrostatic pressure stiffened wire guidance system. Innovare constructed the two wire guidance systems and tested them for their ability to reduce wire drawing breakage. One set of hardware provided rigid alignment of the wires to their wire drawing die axes within 0.35 degrees using ''hydrostatic pressure stiffening'' to enable the precision guidance strategy to be implemented for these highly flexible small diameter wires. This apparatus was compared to a guide arrangement that used short span mechanical guide alignment with a misalignment limit of about 0.75 degrees. Four …
Date:
May 20, 2003
Creator:
Austen, Alfred R.
Object Type:
Report
System:
The UNT Digital Library
MEASURING BETA FUNCTION AND PHASE ADVANCE IN RHIC WITH AN AC DIPOLE.
High energy hadron collider operation requires accurate measurements of the beta functions and phase advances, to check the linear optics and to locate gradient errors. During the RHIC 2003 run, two AC dipoles with vertical and horizontal magnetic field [1] were used to measure the linear optics at storage and at injection energies. The two AC dipoles are set up to adiabatically induce sizable coherent oscillations at a frequency close to the betatron frequencies. The beta functions and phase advances are then calculated from the 1024 turn-by-turn measurements available from all the RHIC BPMs (Beam Position Monitors). Because the coherent excitation is adiabatic, the beam emittance is preserved after the measurement. The algorithm is discussed in this paper, and experimental results are presented.
Date:
May 12, 2003
Creator:
BAI,M. PEGGS,S. ROSER,T. SATOGATA,T.
Object Type:
Article
System:
The UNT Digital Library
SEARCH FOR THE RARE KAON DECAY K{sup +} {yields} {pi}{sup +} {nu}{bar {nu}}
This thesis describes the search for the rare decay K{sup +} {yields} {pi}{sup +} {nu}{bar {nu}} in the pion momentum region 140 MeV/c {le} P{sub {pi}{sup +}} {le} 195 MeV/c. This is a Flavor Changing Neutral Current (FCNC) decay which is forbidden to the first order in the Standard Model (SM) by the GIM mechanism. However, this decay mode is allowed in the second order by two Z-Penguin and one box diagram and is expected to have a branching ratio of (0.72 {+-} 0.21) x 10{sup -10}. This decay mode is sensitive to the coupling of top to down quark and therefore a measurement of the branching ratio for this decay mode provides a measurement of the Cabibbo-Kobayashi-Maskawa matrix element V{sub td}. The recent observation of two events in the pion momentum region 211 MeV/c {le} P{sup {pi}{sup +}} {le} 229 MeV/c estimates a branching ratio of 1.57{sub -0.82}{sup +1.75} x 10{sup -10} for the same decay mode. We have extended the search for this decay to the lower pion momentum region. Data collected by the Experiment E787 at Brookhaven National Laboratory during the 1996 and 1997 run were analyzed in this thesis.
Date:
May 3, 2003
Creator:
BHUYAN,B.
Object Type:
Report
System:
The UNT Digital Library
STOCHASTIC COOLING FOR RHIC.
Emittance growth due to Intra-Beam Scattering significantly reduces the heavy ion luminosity lifetime in RHIC. Stochastic cooling of the stored beam could improve things considerably by counteracting IBS and preventing particles from escaping the rf bucket [1]. High frequency bunched-beam stochastic cooling is especially challenging but observations of Schottky signals in the 4-8 GHz band indicate that conditions are favorable in RHIC [2]. We report here on measurements of the longitudinal beam transfer function carried out with a pickup kicker pair on loan from FNAL TEVATRON. Results imply that for ions a coasting beam description is applicable and we outline some general features of a viable momentum cooling system for RHIC.
Date:
May 12, 2003
Creator:
BLASKIEWICZ,M. BRENNAN,J. M. CAMERON,P. WEI,J.
Object Type:
Article
System:
The UNT Digital Library
LONGITUDINAL SOLUTIONS IN RHIC.
Stable, coherent, longitudinal oscillations have been observed in the RHIC accelerator. Within the context of perturbation theory, the beam parameters and machine impedance suggest these oscillations should be Landau damped. When nonlinear effects are included, long lived, stable oscillations become possible for low intensity beams. Simulations and theory are compared with data.
Date:
May 12, 2003
Creator:
BLASKIEWICZ,M. BRENNAN,J. M. FISCHER,W. CAMERON,P. WEI,J. LUQUE,A. SCHAMEL,H.
Object Type:
Article
System:
The UNT Digital Library
ACME: Algorithms for Contact in a Multiphysics Environment API Version 1.3
An effort is underway at Sandia National Laboratories to develop a library of algorithms to search for potential interactions between surfaces represented by analytic and discretized topological entities. This effort is also developing algorithms to determine forces due to these interactions for transient dynamics applications. This document describes the Application Programming Interface (API) for the ACME (Algorithms for Contact in a Multiphysics Environment) library.
Date:
May 1, 2003
Creator:
BROWN, KEVIN H.; VOTH, THOMAS E.; GLASS, MICHEAL W.; GULLERUD, ARNE S.; HEINSTEIN, MARTIN W. & JONES, REESE E.
Object Type:
Report
System:
The UNT Digital Library
STATUS OF SLOW EXTRACTION OF HIGH INTENSITY PROTONS FROM BROOKHAVEN'S AGS.
The Brookhaven AGS third integer resonant extraction system allows the AGS to provide high quality, high intensity 25.5 GeV/c proton beams simultaneously to four target stations and as many as 8 experiments. With the increasing intensities (over 7 x 10{sup 13} protons/pulse) and associated longer spill periods (2.4 to 3 seconds long), we continue to run with low losses and high quality low modulation continuous current beams. We have an active program of high energy physics experiments, including the high precision measurement of the muons magnetic moment [1] and the discovery of the rare Kaon decay, K+ {yields} {pi} + {nu}{bar {nu}} [2]. This program is continuing into the future with the rare symmetry violating process experiments [3] currently being designed to operate at the AGS. In this paper, we will present results from operation of high intensity slow extraction, the problems we encounter, and our solutions to those problems.
Date:
May 12, 2003
Creator:
BROWN,K. A. AHRENS,L. BRENNAN,J. M. GLENN,J. W. ROSER,T. RUSSO,T. TSOUPAS,N. SMITH,K. ZENO,K.
Object Type:
Article
System:
The UNT Digital Library
RHIC POWER SUPPLIES - LESSONS LEARNED FROM THE 1999 - 2001 RHIC RUNS.
The Relativistic Heavy Ion Collider (RHIC) was commissioned in 1999 and 2000. The two RHIC rings require a total of 933 power supplies (PSs) to supply currents to highly inductive superconducting magnets. These units function as 4 main PSs, 237 insertion region (02) PSs, 24 sextupole PSs, 24 Gamma-T PSs, 8 snake PSs, 16 spin rotator PSs, and 620 correction PSs. PS reliability in this type of machine is of utmost importance because the IR PSs are nested within other IR PSs, and these are all nested within the main PSs. This means if any main or IR PS trips off due to a PS fault or quench indication, then all the IR and main PSs in that ring must follow. When this happens, the Quench Protection Assemblies (QPA's) for each unit disconnects the PSs from the circuit and absorb the stored energy in the magnets. Commissioning these power supplies and QPA's was and still is a learning experience. A summary of the major problems encountered during these first three RHIC runs will be presented along with solutions.
Date:
May 12, 2003
Creator:
BRUNO,D. ENG,W. GANETIS,G. LAMBIASE,R. F. LOUIE,W. SANDBERG,J. SCHULTHEISS,C.
Object Type:
Article
System:
The UNT Digital Library