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In-situ spectro-microscopy on organic films: Mn-Phthalocyanine on Ag(100)
Metal phthalocyanines are attracting significant attention, owing to their potential for applications in chemical sensors, solar cells and organic magnets. As the electronic properties of molecular films are determined by their crystallinity and molecular packing, the optimization of film quality is important for improving the performance of organic devices. Here, we present the results of in situ low-energy electron microscopy / photoemission electron microscopy (LEEM/PEEM) studies of incorporation-limited growth [1] of manganese-phthalocyanine (MnPc) on Ag(100) surfaces. MnPc thin films were grown on both, bulk Ag(100) surface and thin Ag(100)/Fe(100) films, where substrate spin-polarized electronic states can be modified through tuning the thickness of the Ag film [2]. We also discuss the electronic structure and magnetic ordering in MnPc thin films, investigated by angle- and spin-resolved photoemission spectroscopy.
Date:
August 18, 2013
Creator:
A., Al-Mahboob; Vescovo, E. & Sadowski, J.T.
Object Type:
Article
System:
The UNT Digital Library
Differential Thermal Analyses of CdMnZnTe Alloys
N/A
Date:
August 27, 2013
Creator:
A., Bolotnikov
Object Type:
Article
System:
The UNT Digital Library
Side-surface passivation effect on the electrical properties of metal-CdZnTe-metal structures
N/A
Date:
August 25, 2013
Creator:
A., Bolotnikov; Sklyarchuk, V.; Fochuk, P.; Zakharuk, Z.; Grill, R.; Kutny, V. Rybka, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Transport Phenomena and Interfacial Kinetics in Planar Microfluidic Membraneless Fuel Cells
Our work is focused on membraneless laminar flow fuel cells, an unconventional fuel cell technology, intended to create a system that not only avoids most typical fuel cell drawbacks, but also achieves the highest power density yet recorded for a non-H{sub 2} fuel cell. We have employed rigorous electrochemistry to characterize the high-energy- density fuel BH4-, providing important mechanistic insight for anode catalyst choice and avoiding deleterious side reactions. Numerous fuel cell oxidants, used in place of O{sub 2}, are compared in a detailed, uniform manner, and a powerful new oxidant, cerium ammonium nitrate (CAN), is described. The high-voltage BH{sub 4}{sup -}/CAN fuel/oxidant combination is employed in a membraneless, room temperature, laminar-flow fuel cell, with herringbone micromixers which provide chaotic-convective flow which, in turn, enhances both the power output and efficiency of the device. We have also been involved in the design of a scaled-up version of the membraneless laminar flow fuel cell intended to provide a 10W output.
Date:
August 1, 2013
Creator:
Abruna, Hector Daniel
Object Type:
Report
System:
The UNT Digital Library
Hard Probes in Heavy Ion Collisions at the LHC: PDFs, Shadowing and $pA$ Collisions
None
Date:
August 7, 2013
Creator:
Accardi, Alberto; Armesto, N.; Botje, M.; Brodsky, S. J.; Cole, B.; Eskola, K. J. et al.
Object Type:
Article
System:
The UNT Digital Library
Qos Aware Service Oriented Architecture
Service-oriented architecture enables web services to operate in a loosely-coupled setting and provides an environment for dynamic discovery and use of services over a network using standards such as WSDL, SOAP, and UDDI. Web service has both functional and non-functional characteristics. This thesis work proposes to add QoS descriptions (non-functional properties) to WSDL and compose various services to form a business process. This composition of web services also considers QoS properties along with functional properties and the composed services can again be published as a new Web Service and can be part of any other composition using Composed WSDL.
Date:
August 2013
Creator:
Adepu, Sagarika
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Incorporating Cold Cap Behavior in a Joule-heated Waste Glass Melter Model
In this paper, an overview of Joule-heated waste glass melters used in the vitrification of high level waste (HLW) is presented, with a focus on the cold cap region. This region, in which feed-to-glass conversion reactions occur, is critical in determining the melting properties of any given glass melter. An existing 1D computer model of the cold cap, implemented in MATLAB, is described in detail. This model is a standalone model that calculates cold cap properties based on boundary conditions at the top and bottom of the cold cap. Efforts to couple this cold cap model with a 3D STAR-CCM+ model of a Joule-heated melter are then described. The coupling is being implemented in ModelCenter, a software integration tool. The ultimate goal of this model is to guide the specification of melter parameters that optimize glass quality and production rate.
Date:
August 1, 2013
Creator:
Agarwal, Varija & Guillen, Donna Post
Object Type:
Report
System:
The UNT Digital Library
Multiphysics Integrated Coupling Environment (MICE) User Manual
The complex, multi-part nature of waste glass melters used in nuclear waste vitrification poses significant modeling challenges. The focus of this project has been to couple a 1D MATLAB model of the cold cap region within a melter with a 3D STAR-CCM+ model of the melter itself. The Multiphysics Integrated Coupling Environment (MICE) has been developed to create a cohesive simulation of a waste glass melter that accurately represents the cold cap. The one-dimensional mathematical model of the cold cap uses material properties, axial heat, and mass fluxes to obtain a temperature profile for the cold cap, the region where feed-to-glass conversion occurs. The results from Matlab are used to update simulation data in the three-dimensional STAR-CCM+ model so that the cold cap is appropriately incorporated into the 3D simulation. The two processes are linked through ModelCenter integration software using time steps that are specified for each process. Data is to be exchanged circularly between the two models, as the inputs and outputs of each model depend on the other.
Date:
August 1, 2013
Creator:
Agarwal, Varija & Guillen, Donna Post
Object Type:
Report
System:
The UNT Digital Library
Spatial Mismatch Between Hiv Infection and Access to Hiv Service Facilities in Texas
Since 2004, the number of people living with HIV (PLWH) has steadily increased by about 5% and currently, the number in Texas is about 86,000. Though the National HIV/AIDS Strategic Plan seeks to ensure “unfettered access to quality healthcare”, barriers to access still exist especially among minority populations. This study examines the relationship between HIV infection rates and the geographic location of HIV service centers with a focus on 4 counties: namely, Dallas, Denton, Harris and Tarrant. The goal is to show whether there is a spatial mismatch between HIV rates and service providers. Are service facilities located in zip codes where they are most needed? Using the vulnerability framework and the Inverse Care Law (ICL), we address the research question using demographic variables (race/ethnicity, sex, poverty, education attainment) and HIV data. Our results show that extreme vulnerable zip codes have high HIV rates and closest proximity to HIV service providers.
Date:
August 2013
Creator:
Aggrey Korsah, Emmanuel
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Materials Inventory Database for the Light Water Reactor Sustainability Program
Scientific research involves the purchasing, processing, characterization, and fabrication of many sample materials. The history of such materials can become complicated over their lifetime – materials might be cut into pieces or moved to various storage locations, for example. A database with built-in functions to track these kinds of processes facilitates well-organized research. The Material Inventory Database Accounting System (MIDAS) is an easy-to-use tracking and reference system for such items. The Light Water Reactor Sustainability Program (LWRS), which seeks to advance the long-term reliability and productivity of existing nuclear reactors in the United States through multiple research pathways, proposed MIDAS as an efficient way to organize and track all items used in its research. The database software ensures traceability of all items used in research using built-in functions which can emulate actions on tracked items – fabrication, processing, splitting, and more – by performing operations on the data. MIDAS can recover and display the complete history of any item as a simple report. To ensure the database functions suitably for the organization of research, it was developed alongside a specific experiment to test accident tolerant nuclear fuel cladding under the LWRS Advanced Light Water Reactor Nuclear Fuels Pathway. MIDAS kept …
Date:
August 1, 2013
Creator:
Ahmed, Kazi & Bragg-Sitton, Shannon M.
Object Type:
Report
System:
The UNT Digital Library
X-ray diffraction diagnostic design for the National Ignition Facility
None
Date:
August 22, 2013
Creator:
Ahmed, M F; Ayers, J; House, A; Lamb, Z; Swift, R & Swift, D
Object Type:
Article
System:
The UNT Digital Library
Overcoming Extreme-Scale Reproducibility Challenges Through a Unified, Targeted and Multilevel Toolset
None
Date:
August 13, 2013
Creator:
Ahn, D H; Lee, G L; Gopalakrishnan, G; Rakamaric, Z; Schulz, M & Laguna, I
Object Type:
Article
System:
The UNT Digital Library
The Effects of Adlerian Play Therapy on Maladaptive Perfectionism and Anxiety and in Children
I used singlecase A-B-A experimental design to examine the effectiveness of Adlerian play therapy (AdPT) for children identified with clinical levels of perfectionism on the Conners Parent Rating Scale-Revised and Conners Teacher Rating Scale-Revised. Participants were 2 children, a 10 year-old Hispanic male and a 7 year-old Caucasian female. To examine the effect of AdPT on maladaptive perfectionism and anxiety, the Child-Adolescent Perfectionism Scale and the Revised Children’s Manifest Anxiety Scale were administered to the children twice weekly over 3 phases of the study: baseline (6 administrations), intervention (12-16 administrations), and maintenance (6 administrations) for a total of 24 to 29 data points. Additionally, parents and teachers completed the Conners Rating Scales-Revised5 times: (1) prior to study, (2) following baseline/prior to treatment, (3) midpoint of treatment, (4) following treatment, and (5) following maintenance phase.During the intervention phase, the male and female participants attended 21 and 16 play therapy sessions, their mothers attended 6 and 5 parent consultations, and their teachers attended 6 and 3 teacher consultations, respectively. Analysis of the child self-report assessments indicated mixed and inconclusive results regarding the effects of AdPT on target behaviors. However, results of the parent and teacher reports indicated clinically significant reductionsin maladaptive perfectionism …
Date:
August 2013
Creator:
Akay, Sinem
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Rh-Based Mixed Alcohol Synthesis Catalysts: Characterization and Computational Report
The U.S. Department of Energy is conducting a program focused on developing a process for the conversion of biomass to bio-based fuels and co-products. Biomass-derived syngas is converted thermochemically within a temperature range of 240 to 330°C and at elevated pressure (e.g., 1200 psig) over a catalyst. Ethanol is the desired reaction product, although other side compounds are produced, including C3 to C5 alcohols; higher (i.e., greater than C1) oxygenates such as methyl acetate, ethyl acetate, acetic acid and acetaldehyde; and higher hydrocarbon gases such as methane, ethane/ethene, propane/propene, etc. Saturated hydrocarbon gases (especially methane) are undesirable because they represent a diminished yield of carbon to the desired ethanol product and represent compounds that must be steam reformed at high energy cost to reproduce CO and H2. Ethanol produced by the thermochemical reaction of syngas could be separated and blended directly with gasoline to produce a liquid transportation fuel. Additionally, higher oxygenates and unsaturated hydrocarbon side products such as olefins also could be further processed to liquid fuels. The goal of the current project is the development of a Rh-based catalyst with high activity and selectivity to C2+ oxygenates. This report chronicles an effort to characterize numerous supports and catalysts …
Date:
August 1, 2013
Creator:
Albrecht, Karl O.; Glezakou, Vassiliki Alexandra; Rousseau, Roger J.; Engelhard, Mark H.; Varga, Tamas; Colby, Robert J. et al.
Object Type:
Report
System:
The UNT Digital Library
Field Testing of the COTS DESI/DART-MS/MS System Against High Explosives Residues
None
Date:
August 9, 2013
Creator:
Alcaraz, A.
Object Type:
Report
System:
The UNT Digital Library
The Colony Courier-Leader (The Colony, Tex.), Vol. 32, No. 28, Ed. 1 Sunday, August 11, 2013
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
August 11, 2013
Creator:
Aldaz, Gina & Mann, Rick
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier-Leader (The Colony, Tex.), Vol. 32, No. 29, Ed. 1 Sunday, August 18, 2013
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
August 18, 2013
Creator:
Aldaz, Gina & Mann, Rick
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier-Leader (The Colony, Tex.), Vol. 32, No. 30, Ed. 1 Sunday, August 25, 2013
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
August 25, 2013
Creator:
Aldaz, Gina & Mann, Rick
Object Type:
Newspaper
System:
The Portal to Texas History
Curating the Southwest Region's Maps: UNT-UTA Collaborative Project
Presentation for the 2013 Cross Timbers Library Collaborative (CTLC) Conference discussing the Mapping the Southwest project. Mapping the Southwest was a 3-year project (2010-2013) funded by a National Endowment for the Humanities (NEH) We the People grant. This presentation discusses the background of the project, the goals and activities, impacts, and lessons learned.
Date:
August 16, 2013
Creator:
Alemneh, Daniel Gelaw; Phillips, Mark Edward & Hartman, Cathy Nelson
Object Type:
Presentation
System:
The UNT Digital Library
Injurious Species Listings Under the Lacey Act: A Legal Briefing
This report examines the Lacey Act provision that directs injurious species bans and is codified in the criminal code, Title 18. The injurious species provision addresses prohibited acts, exceptions, and penalties.
Date:
August 1, 2013
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Algorithm for Screening Phasor Measurement Unit Data for Power System Events and Categories and Common Characteristics for Events Seen in Phasor Measurement Unit Relative Phase-Angle Differences and Frequency Signals
A network of multiple phasor measurement units (PMU) was created, set up, and maintained at the University of Texas at Austin to obtain actual power system measurements for power system analysis. Power system analysis in this report covers a variety of time ranges, such as short- term analysis for power system disturbances and their effects on power system behavior and long- term power system behavior using modal analysis. The first objective of this report is to screen the PMU data for events. The second objective of the report is to identify and describe common characteristics extracted from power system events as measured by PMUs. The numerical characteristics for each category and how these characteristics are used to create selection rules for the algorithm are also described. Trends in PMU data related to different levels and fluctuations in wind power output are also examined.
Date:
August 1, 2013
Creator:
Allen, A.; Santoso, S. & Muljadi, E.
Object Type:
Report
System:
The UNT Digital Library
"INDEPENDENT CONFIRMATORY SURVEY SUMMARY AND RESULTS FOR THE FORD NUCLEAR REACTOR, REVISION 1, ANN ARBOR, MICHIGAN
At the NRC�s request, ORAU conducted confirmatory surveys of the FNR during the period of December 4 through 6, 2012. The survey activities included visual inspections and measurement and sampling activities. Confirmatory activities also included the review and assessment of UM�s project documentation and methodologies. Surface scans identified elevated activity in two areas. The first area was on a wall outside of Room 3103 and the second area was in the southwest section on the first floor. The first area was remediated to background levels. However, the second area was due to gamma shine from a neighboring source storage area. A retrospective analysis of UM�s FSS data shows that for the SUs investigated by the ORAU survey team, UM met the survey requirements set forth in the FSSP. The total mean surface activity values were directly compared with the mean total surface activity reported by UM. Mean surface activity values determined by UM were within two standard deviations of the mean determined by ORAU. Additionally, all surface activity values were less than the corresponding gross beta DCGL{sub W}. Laboratory analysis of the soil showed that COC concentrations were less than the respective DCGL{sub W} values. For the inter-lab comparison, the …
Date:
August 1, 2013
Creator:
Altic, Nick A.
Object Type:
Report
System:
The UNT Digital Library
Social Media in Policing: a Study of Dallas-fort Worth Area City Police Departments
Social media offers numerous opportunities to companies, organizations and government agencies to communicate with people outside their organization, to promote their interests and to better serve their customers, or as in the case with government agencies, to better serve their citizens. However, little is known about how police departments in particular use social media. This research study explores why police departments use social media, how they manage their social media tools, and the problems and challenges experienced as they use social media. This qualitative study is largely guided by grounded theory. The data were collected from a study population using local police departments in the Dallas-Fort worth (DFW) area principal cities using both individual interviews with police departments’ social media officers and observations of these departments’ online social media tools (in particular, Facebook and Twitter). This study has shown that the DFW area city police departments are using social media quite extensively to keep the public informed and often for investigative purposes. There are some success factors to adopting and using these tools, such as the motivation of department staff and their benefits, successful implementation of the tools, the simplicity of using tools and that it is absolutely free.
Date:
August 2013
Creator:
Altunbas, Fuat
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Real-time Rendering of Burning Objects in Video Games
In recent years there has been growing interest in limitless realism in computer graphics applications. Among those, my foremost concentration falls into the complex physical simulations and modeling with diverse applications for the gaming industry. Different simulations have been virtually successful by replicating the details of physical process. As a result, some were strong enough to lure the user into believable virtual worlds that could destroy any sense of attendance. In this research, I focus on fire simulations and its deformation process towards various virtual objects. In most game engines model loading takes place at the beginning of the game or when the game is transitioning between levels. Game models are stored in large data structures. Since changing or adjusting a large data structure while the game is proceeding may adversely affect the performance of the game. Therefore, developers may choose to avoid procedural simulations to save resources and avoid interruptions on performance. I introduce a process to implement a real-time model deformation while maintaining performance. It is a challenging task to achieve high quality simulation while utilizing minimum resources to represent multiple events in timely manner. Especially in video games, this overwhelming criterion would be robust enough to sustain …
Date:
August 2013
Creator:
Amarasinghe, Dhanyu Eshaka
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library