Multiple Agencies Provide Assistance to Service-disabled Veterans or Entrepreneurs, but Specific Needs Are Difficult to Identify and Coordination Is Weak (open access)

Multiple Agencies Provide Assistance to Service-disabled Veterans or Entrepreneurs, but Specific Needs Are Difficult to Identify and Coordination Is Weak

Correspondence issued by the Government Accountability Office with an abstract that begins "As of July 2008, the Department of Defense (DOD) reported that almost 33,000 servicemembers had been wounded in action as part of Operation Enduring Freedom or Operation Iraqi Freedom. Some of these servicemembers could have injuries that keep them from easily entering or returning to the workplace upon their exit from the military. For some service-disabled veterans, starting a business may be one option for entering or returning to the workforce. In the Veterans Entrepreneurship and Small Business Development Act of 1999 (P.L. 106-50), Congress stated that too little had been done to help veterans, particularly service-disabled veterans, in starting small businesses. This law established the framework for the Small Business Administration (SBA), the Department of Veterans Affairs (VA), the Department of Labor (DOL), DOD, and others to coordinate in providing entrepreneurial assistance to veterans and servicedisabled veterans. To improve coordination and enhance small business assistance to veterans, the law required that these agencies enter into memorandums of understanding (MOU) as specified in the 1999 Act (but not all of the agencies were required to participate in each of the MOUs); established the National Veterans Business Development Corporation …
Date: October 15, 2008
Creator: United States. Government Accountability Office.
Object Type: Text
System: The UNT Digital Library
Defense Management: DOD Can Establish More Guidance for Biometrics Collection and Explore Broader Data Sharing (open access)

Defense Management: DOD Can Establish More Guidance for Biometrics Collection and Explore Broader Data Sharing

A letter report issued by the Government Accountability Office with an abstract that begins "The events of September 11, 2001, and operations in Afghanistan and Iraq have made it critical for military units to identify individuals they encounter and share this information with other units and federal agencies. Biometrics are unique personal aspects such as fingerprints and iris images used to identify an unfamiliar person. Federal agencies with national security missions, such as the Departments of Homeland Security (DHS) and State (DOS), need access to certain biometrics data gathered by the Department of Defense (DOD). GAO was asked to determine to what extent (1) DOD has guidance on the biometrics data to be collected to support military activities, and (2) there may be gaps in biometrics information shared between DOD and DHS. This is a public version of a For Official Use Only report, GAO-08-430NI, issued in May 2008. GAO examined DOD's guidance for field collection of biometrics data, biometrics sharing agreements, and information on national level efforts to enhance data sharing."
Date: October 15, 2008
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
Final Technical Report (open access)

Final Technical Report

The attached report contains the final technical report for the above-mentioned project.
Date: October 15, 2008
Creator: Memik, Gokhan
Object Type: Report
System: The UNT Digital Library
ACRF Instrumentation Status: New, Current, and Future - September 2008 (open access)

ACRF Instrumentation Status: New, Current, and Future - September 2008

The purpose of this report is to provide a concise but comprehensive overview of Atmospheric Radiation Measurement Climate Research Facility instrumentation status. The report is divided into the following five sections: (1) new instrumentation in the process of being acquired and deployed, (2) field campaigns, (3) existing instrumentation and progress on improvements or upgrades, (4) proposed future instrumentation, and (5) Small Business Innovation Research instrument development.
Date: October 15, 2008
Creator: Voyles, J. W.
Object Type: Report
System: The UNT Digital Library
Analysis of Non-Enzymatically Glycated Peptides: Neutral-Loss Triggered MS3 Versus Multi-Stage Activation Tandem Mass Spectrometry (open access)

Analysis of Non-Enzymatically Glycated Peptides: Neutral-Loss Triggered MS3 Versus Multi-Stage Activation Tandem Mass Spectrometry

Non-enzymatic glycation of tissue proteins has important implications in the development of complications of diabetes mellitus. While electron transfer dissociation (ETD) has been shown to outperform collision-induced dissociation (CID) in sequencing glycated peptides by tandem mass spectrometry, ETD instrumentation is not yet available in all laboratories. In this study, we evaluated different advanced CID techniques (i.e., neutral-loss triggered MS3 and multi-stage activation) during LC-MSn analyses of Amadori-modified peptides enriched from human serum glycated in vitro. During neutral-loss triggered MS3 experiments, MS3 scans triggered by neutral-losses of 3 H2O or 3 H2O + HCHO produced similar results in terms of glycated peptide identifications. However, neutral losses of 3 H2O resulted in significantly more glycated peptide identifications during multi-stage activation experiments. Overall, the multi-stage activation approach produced more glycated peptide identifications, while the neutral-loss triggered MS3 approach resulted in much higher specificity. Both techniques offer a viable alternative to ETD for identifying glycated peptides when that method is unavailable.
Date: October 15, 2008
Creator: Zhang, Qibin; Petyuk, Vladislav A.; Schepmoes, Athena A.; Orton, Daniel J.; Monroe, Matthew E.; Yang, Feng et al.
Object Type: Article
System: The UNT Digital Library
Modeling of Carbon Migration During JET Injection Experiments (open access)

Modeling of Carbon Migration During JET Injection Experiments

JET has performed two dedicated carbon migration experiments on the final run day of separate campaigns (2001 and 2004) using {sup 13}CH{sub 4} methane injected into repeated discharges. The EDGE2D/NIMBUS code modelled the carbon migration in both experiments. This paper describes this modelling and identifies a number of important migration pathways: (1) deposition and erosion near the injection location, (2) migration through the main chamber SOL, (3) migration through the private flux region aided by E x B drifts, and (4) neutral migration originating near the strike points. In H-Mode, type I ELMs are calculated to influence the migration by enhancing erosion during the ELM peak and increasing the long-range migration immediately following the ELM. The erosion/re-deposition cycle along the outer target leads to a multistep migration of {sup 13}C towards the separatrix which is called 'walking'. This walking created carbon neutrals at the outer strike point and led to {sup 13}C deposition in the private flux region. Although several migration pathways have been identified, quantitative analyses are hindered by experimental uncertainty in divertor leakage, and the lack of measurements at locations such as gaps and shadowed regions.
Date: October 15, 2008
Creator: Strachan, J. D.; Likonen, J.; Coad, P.; Rubel, M.; Widdowson, A.; Airila, M. et al.
Object Type: Report
System: The UNT Digital Library
Oak Ridge National Laboratory Annual Progress Report for the Power Electronics and Electric Machinery Program (open access)

Oak Ridge National Laboratory Annual Progress Report for the Power Electronics and Electric Machinery Program

The U.S. Department of Energy (DOE) and the U.S. Council for Automotive Research (composed of automakers Ford, General Motors, and Chrysler) announced in January 2002 a new cooperative research effort. Known as FreedomCAR (derived from 'Freedom' and 'Cooperative Automotive Research'), it represents DOE's commitment to developing public/private partnerships to fund high-risk, high-payoff research into advanced automotive technologies. Efficient fuel cell technology, which uses hydrogen to power automobiles without air pollution, is a very promising pathway to achieve the ultimate vision. The new partnership replaces and builds upon the Partnership for a New Generation of Vehicles initiative that ran from 1993 through 2001. The Advanced Power Electronics and Electric Machines (APEEM) subprogram within the Vehicle Technologies Program provides support and guidance for many cutting-edge automotive technologies now under development. Research is focused on understanding and improving the way the various new components of tomorrow's automobiles will function as a unified system to improve fuel efficiency. In supporting the development of hybrid propulsion systems, the APEEM effort has enabled the development of technologies that will significantly improve advanced vehicle efficiency, costs, and fuel economy. The APEEM subprogram supports the efforts of the FreedomCAR and Fuel Partnership through a three-phase approach intended to: …
Date: October 15, 2008
Creator: Olszewski, M.
Object Type: Report
System: The UNT Digital Library
Final Technical Report (open access)

Final Technical Report

Most prokaryotes of interest to DOE are poorly understood. Even when full genomic sequences are available, the function of only a small number of gene products are clear. The critical question is how to best infer the most probable network architectures in cells that are poorly characterized. The project goal is to create a computational hypothesis testing (CHT) framework that combines large-scale dynamical simulation, a database of bioinformatics-derived probable interactions, and numerical parallel architecture data-fitting routines to explore many “what if ?” hypotheses about the functions of genes and proteins within pathways and their downstream effects on molecular concentration profiles and corresponding phenotypes. From this framework we expect to infer signal transduction pathways and gene expression networks in prokaryotes. Detailed mechanistic models of E. Coli have been developed that directly incorporate DNA sequence information. The CHT framework is implemented in the NIEngine network inference software. NIEngine has been applied to recover gene regulatory networks in E. coli to assess performance. Application to Shewanel la oneidensi and other organism of interest DOE will be conducted in partnership with Jim Collin's Lab at Boston University and other academic partners. The CHT framework has also found broad application in the automated learning of …
Date: October 15, 2008
Creator: Church, Bruce W
Object Type: Report
System: The UNT Digital Library
Shotgun Metaproteomics of the Human Distal Gut Microbiota (open access)

Shotgun Metaproteomics of the Human Distal Gut Microbiota

The human gut contains a dense, complex and diverse microbial community, comprising the gut microbiome. Metagenomics has recently revealed the composition of genes in the gut microbiome, but provides no direct information about which genes are expressed or functioning. Therefore, our goal was to develop a novel approach to directly identify microbial proteins in fecal samples to gain information about the genes expressed and about key microbial functions in the human gut. We used a non-targeted, shotgun mass spectrometry-based whole community proteomics, or metaproteomics, approach for the first deep proteome measurements of thousands of proteins in human fecal samples, thus demonstrating this approach on the most complex sample type to date. The resulting metaproteomes had a skewed distribution relative to the metagenome, with more proteins for translation, energy production and carbohydrate metabolism when compared to what was earlier predicted from metagenomics. Human proteins, including antimicrobial peptides, were also identified, providing a non-targeted glimpse of the host response to the microbiota. Several unknown proteins represented previously undescribed microbial pathways or host immune responses, revealing a novel complex interplay between the human host and its associated microbes.
Date: October 15, 2008
Creator: VerBerkmoes, N. C.; Russell, A. L.; Shah, M.; Godzik, A.; Rosenquist, M.; Halfvarsson, J. et al.
Object Type: Article
System: The UNT Digital Library
Perspectives on distributed computing : thirty people, four user types, and the distributed computing user experience. (open access)

Perspectives on distributed computing : thirty people, four user types, and the distributed computing user experience.

This report summarizes the methodology and results of a user perspectives study conducted by the Community Driven Improvement of Globus Software (CDIGS) project. The purpose of the study was to document the work-related goals and challenges facing today's scientific technology users, to record their perspectives on Globus software and the distributed-computing ecosystem, and to provide recommendations to the Globus community based on the observations. Globus is a set of open source software components intended to provide a framework for collaborative computational science activities. Rather than attempting to characterize all users or potential users of Globus software, our strategy has been to speak in detail with a small group of individuals in the scientific community whose work appears to be the kind that could benefit from Globus software, learn as much as possible about their work goals and the challenges they face, and describe what we found. The result is a set of statements about specific individuals experiences. We do not claim that these are representative of a potential user community, but we do claim to have found commonalities and differences among the interviewees that may be reflected in the user community as a whole. We present these as a series …
Date: October 15, 2008
Creator: Childers, L.; Liming, L.; Foster, I.; Science, Mathematics and Computer & Chicago, Univ. of
Object Type: Report
System: The UNT Digital Library
Decisive role of the energetics of dissociation products in the adsorption of water on O/Ru(0001) (open access)

Decisive role of the energetics of dissociation products in the adsorption of water on O/Ru(0001)

Using density-functional theory they found that, depending on coverage, coadsorbed oxygen can act both as a promoter and as an inhibitor of the dissociation of water on Ru(0001), the transition between these two behaviors occurring at (0.2 M). The key factor that determines this transition is the adsorption energy of the reaction products, OH in particular. The chemistry of this coadsorbed system is dictated by the effective coordination of the Ru atoms that participate in the bonding of the different species. In particular, they observed that a low coverage of oxygen increases the adsorption energy of the OH fraction on the Ru surface. This surprising extra stabilization of the OH with the coadsorption of oxygen can be understood in the context of the metallic bonding and could well correspond to a general trend for the coadsorption of electronegative species on metallic surfaces.
Date: October 15, 2008
Creator: Cabrera-Sanfelix, Pepa; Arnau, Andres; Mugarza, Aitor; Shimizu, Tomoko K.; Salmeron, Miquel & Sánchez-Portal, Daniel
Object Type: Article
System: The UNT Digital Library
Capital Punishment Legislation in the 110th Congress: A Sketch (open access)

Capital Punishment Legislation in the 110th Congress: A Sketch

This report is a sketch on Capital Punishment Legislation in the 110th Congress.
Date: October 15, 2008
Creator: Doyle, Charles
Object Type: Report
System: The UNT Digital Library
The Americans with Disabilities Act and Emergency Preparedness and Response (open access)

The Americans with Disabilities Act and Emergency Preparedness and Response

The Americans with Disabilities Act provides broad nondiscrimination protection for individuals with disabilities in employment, public services, and public accommodations and serves operated by private entities. Although the ADA does not include provisions specifically discussing its application to disasters, its nondiscrimination provisions are applicable to emergency preparedness and responses to disasters. In order to further the ADA's goals, President Bush issued an Executive Order on July 22nd, 2004, relating to emergency preparedness for individuals with disabilities and establishing the Interagency Coordinating Council on Emergency Preparedness and Individuals with Disabilities. The Department of Homeland Security issued its Nationwide Plan Review Phase 2 Report, which includes a discussion of people with disabilities and emergency planning and readiness. The National Council on Disability has also issued a recommendation on emergency preparation and disaster relief relating to individuals with disabilities. The post-Katrina Emergency Management Reform Act of 2006 added the position of Disability Coordinator to FEMA.
Date: October 15, 2008
Creator: Jones, Nancy Lee
Object Type: Report
System: The UNT Digital Library
Computational Fluid Dynamics (CFD) Modeling for High Rate Pulverized Coal Injection (PCI) into the Blast Furnace (open access)

Computational Fluid Dynamics (CFD) Modeling for High Rate Pulverized Coal Injection (PCI) into the Blast Furnace

Pulverized coal injection (PCI) into the blast furnace (BF) has been recognized as an effective way to decrease the coke and total energy consumption along with minimization of environmental impacts. However, increasing the amount of coal injected into the BF is currently limited by the lack of knowledge of some issues related to the process. It is therefore important to understand the complex physical and chemical phenomena in the PCI process. Due to the difficulty in attaining trus BF measurements, Computational fluid dynamics (CFD) modeling has been identified as a useful technology to provide such knowledge. CFD simulation is powerful for providing detailed information on flow properties and performing parametric studies for process design and optimization. In this project, comprehensive 3-D CFD models have been developed to simulate the PCI process under actual furnace conditions. These models provide raceway size and flow property distributions. The results have provided guidance for optimizing the PCI process.
Date: October 15, 2008
Creator: Zhou, Dr. Chenn
Object Type: Report
System: The UNT Digital Library
Corrosion-induced gas generation in a nuclear waste repository: Reactive geochemistry and multiphase flow effect (open access)

Corrosion-induced gas generation in a nuclear waste repository: Reactive geochemistry and multiphase flow effect

Corrosion of steel canisters, stored in a repository for spent fuel and high-level nuclear wastes, leads to the generation and accumulation of hydrogen gas in the backfilled emplacement tunnels, which may significantly affect long-term repository safety. Previous studies used H{sub 2} generation rates based on the volume of the waste or canister material and the stoichiometry of the corrosion reaction. However, iron corrosion and H{sub 2} generation rates vary with time, depending on factors such as amount of iron, water availability, water contact area, and aqueous and solid chemistry. To account for these factors and feedback mechanisms, we developed a chemistry model related to iron corrosion, coupled with two-phase (liquid and gas) flow phenomena that are driven by gas-pressure buildup associated with H{sub 2} generation and water consumption. Results indicate that by dynamically calculating H{sub 2} generation rates based on a simple model of corrosion chemistry, and by coupling this corrosion reaction with two-phase flow processes, the degree and extent of gas pressure buildup could be much smaller compared to a model that neglects the coupling between flow and reactive transport mechanisms. By considering the feedback of corrosion chemistry, the gas pressure increases initially at the canister, but later decreases …
Date: October 15, 2008
Creator: Xu, T.; Senger, R. & Finsterle, S.
Object Type: Article
System: The UNT Digital Library
Atomic structure of nanometer-sized amorphous TiO2 (open access)

Atomic structure of nanometer-sized amorphous TiO2

Amorphous titania (TiO{sub 2}) is an important precursor for synthesis of single-phase nanocrystalline anatase. We synthesized x-ray amorphous titania by hydrolysis of titanium ethoxide at the ice point. Transmission electron microscopy examination and nitrogen gas adsorption indicated the particle size of the synthesized titania is {approx} 2 nm. Synchrotron wide-angle x-ray scattering (WAXS) was used to probe the atomic correlations in this amorphous sample. Atomic pair-distribution function (PDF) derived from Fourier transform of the WAXS data was used for reverse Monte Carlo (RMC) simulations of the atomic structure of the amorphous TiO{sub 2} nanoparticles. Molecular dynamics simulations were used to generate input structures for the RMC. X-ray absorption spectroscopy (XAS) simulations were used to screen candidate structures obtained from the RMC by comparing with experimental XAS data. The structure model that best describes both the WAXS and XAS data shows that an amorphous TiO{sub 2} particle consists of a highly distorted shell and a small strained anatase-like crystalline core. The average coordination number of Ti is 5.3 and most Ti-O bonds are populated around 1.940 {angstrom}. Relative to bulk TiO{sub 2}, the reduction of the coordination number is primarily due to the truncation of the Ti-O octahedra at the amorphous …
Date: October 15, 2008
Creator: Zhang, H.; Chen, B.; Banfield, J. F. & Waychunas, G. A.
Object Type: Article
System: The UNT Digital Library
Recent advances in well-based monitoring of CO2 sequestration (open access)

Recent advances in well-based monitoring of CO2 sequestration

Recent CO{sub 2} sequestration pilot projects have implemented novel approaches to well-based subsurface monitoring aimed at increasing the amount and quality of information available from boreholes. Some of the drivers for the establishment of new well-based technologies and methodologies arise from: (1) the need for data to assess physical and geochemical subsurface processes associated with CO{sub 2} emplacement; (2) the high cost of deep boreholes and need to maximize data yield from each; (3) need for increased temporal resolution to observe plume evolution; (4) a lack of established processes and technologies for integrated permanent sensors in the oil and gas industry; and (5) a lack of regulatory guidance concerning the amount, type, and duration of monitoring required for long-term performance confirmation of a CO{sub 2} storage site. In this paper we will examine some of the latest innovations in well-based monitoring and present examples of integrated monitoring programs.
Date: October 15, 2008
Creator: Freifeld, B.; Daley, T.; Hovorka, S.; Henninges, J.; Underschultz, J. & Sharma, S.
Object Type: Article
System: The UNT Digital Library
The effects of gas-fluid-rock interactions on CO2 injection and storage: Insights from reactive transport modeling (open access)

The effects of gas-fluid-rock interactions on CO2 injection and storage: Insights from reactive transport modeling

Possible means of reducing atmospheric CO{sub 2} emissions include injecting CO{sub 2} in petroleum reservoirs for Enhanced Oil Recovery or storing CO{sub 2} in deep saline aquifers. Large-scale injection of CO{sub 2} into subsurface reservoirs would induce a complex interplay of multiphase flow, capillary trapping, dissolution, diffusion, convection, and chemical reactions that may have significant impacts on both short-term injection performance and long-term fate of CO{sub 2} storage. Reactive Transport Modeling is a promising approach that can be used to predict the spatial and temporal evolution of injected CO{sub 2} and associated gas-fluid-rock interactions. This presentation will summarize recent advances in reactive transport modeling of CO{sub 2} storage and review key technical issues on (1) the short- and long-term behavior of injected CO{sub 2} in geological formations; (2) the role of reservoir mineral heterogeneity on injection performance and storage security; (3) the effect of gas mixtures (e.g., H{sub 2}S and SO{sub 2}) on CO{sub 2} storage; and (4) the physical and chemical processes during potential leakage of CO{sub 2} from the primary storage reservoir. Simulation results suggest that CO{sub 2} trapping capacity, rate, and impact on reservoir rocks depend on primary mineral composition and injecting gas mixtures. For example, models …
Date: October 15, 2008
Creator: Xiao, Y.; Xu, T. & Pruess, K.
Object Type: Article
System: The UNT Digital Library
Bells Galore: Oscillations and circle-map dynamics from space-filling fractal functions (open access)

Bells Galore: Oscillations and circle-map dynamics from space-filling fractal functions

The construction of a host of interesting patterns over one and two dimensions, as transformations of multifractal measures via fractal interpolating functions related to simple affine mappings, is reviewed. It is illustrated that, while space-filling fractal functions most commonly yield limiting Gaussian distribution measures (bells), there are also situations (depending on the affine mappings parameters) in which there is no limit. Specifically, the one-dimensional case may result in oscillations between two bells, whereas the two-dimensional case may give rise to unexpected circle map dynamics of an arbitrary number of two-dimensional circular bells. It is also shown that, despite the multitude of bells over two dimensions, whose means dance making regular polygons or stars inscribed on a circle, the iteration of affine maps yields exotic kaleidoscopes that decompose such an oscillatory pattern in a way that is similar to the many cases that converge to a single bell.
Date: October 15, 2008
Creator: Puente, C.E.; Cortis, A. & Sivakumar, B.
Object Type: Article
System: The UNT Digital Library
Nonlinear extensions of a fractal-multifractal approach for environmental modeling (open access)

Nonlinear extensions of a fractal-multifractal approach for environmental modeling

We present the extension of a deterministic fractal geometric procedure aimed at representing the complexity of the spatio-temporal patterns encountered in environmental applications. The original procedure, which is based on transformations of multifractal distributions via fractal functions, is extended through the introduction of nonlinear perturbations to the underlying iterated linear maps. We demonstrate how the nonlinear perturbations generate yet a richer collection of patterns by means of various simulations that include evolutions of patterns based on changes in their parameters and in their statistical and multifractal properties. It is shown that the nonlinear extensions yield structures that closely resemble complex hydrologic temporal data sets, such as rainfall and runoff time series, and width-functions of river networks as a function of distance from the basin outlet. The implications of this nonlinear approach for environmental modeling and prediction are discussed.
Date: October 15, 2008
Creator: Cortis, A.; Puente, C.E. & Sivakumar, B.
Object Type: Article
System: The UNT Digital Library
Multiphase flow and multicomponent reactive transport model of the ventilation experiment in Opalinus clay (open access)

Multiphase flow and multicomponent reactive transport model of the ventilation experiment in Opalinus clay

During the construction and operational phases of a high-level radioactive waste (HLW) repository constructed in a clay formation, ventilation of underground drifts will cause desaturation and oxidation of the rock. The Ventilation Experiment (VE) was performed in a 1.3 m diameter unlined horizontal microtunnel on Opalinus clay at Mont Terri underground research laboratory in Switzerland to evaluate the impact of desaturation on rock properties. A multiphase flow and reactive transport model of VE is presented here. The model accounts for liquid, vapor and air flow, evaporation/condensation and multicomponent reactive solute transport with kinetic dissolution of pyrite and siderite and local-equilibrium dissolution/precipitation of calcite, ferrihydrite, dolomite, gypsum and quartz. Model results reproduce measured vapor flow, liquid pressure and hydrochemical data and capture the trends of measured relative humidities, although such data are slightly overestimated near the rock interface due to uncertainties in the turbulence factor. Rock desaturation allows oxygen to diffuse into the rock and triggers pyrite oxidation, dissolution of calcite and siderite, precipitation of ferrihydrite, dolomite and gypsum and cation exchange. pH in the unsaturated rock varies from 7.8 to 8 and is buffered by calcite. Computed changes in the porosity and the permeability of Opalinus clay in the unsaturated …
Date: October 15, 2008
Creator: Zheng, L.; Samper, J.; Montenegro, L. & Major, J.C.
Object Type: Article
System: The UNT Digital Library
Applications of a single-molecule detection in early disease diagnosis and enzymatic reaction study (open access)

Applications of a single-molecule detection in early disease diagnosis and enzymatic reaction study

Various single-molecule techniques were utilized for ultra-sensitive early diagnosis of viral DNA and antigen and basic mechanism study of enzymatic reactions. DNA of human papilloma virus (HPV) served as the screening target in a flow system. Alexa Fluor 532 (AF532) labeled single-stranded DNA probes were hybridized to the target HPV-16 DNA in solution. The individual hybridized molecules were imaged with an intensified charge-coupled device (ICCD) in two ways. In the single-color mode, target molecules were detected via fluorescence from hybridized probes only. This system could detect HPV-16 DNA in the presence of human genomic DNA down to 0.7 copy/cell and had a linear dynamic range of over 6 orders of magnitude. In the dual-color mode, fluorescence resonance energy transfer (FRET) was employed to achieve zero false-positive count. We also showed that DNA extracts from Pap test specimens did not interfere with the system. A surface-based method was used to improve the throughput of the flow system. HPV-16 DNA was hybridized to probes on a glass surface and detected with a total internal reflection fluorescence (TIRF) microscope. In the single-probe mode, the whole genome and target DNA were fluorescently labeled before hybridization, and the detection limit is similar to the flow …
Date: October 15, 2008
Creator: Li, Jiangwei
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Estimation of the curvature of an interface from a digital 2D image (open access)

Estimation of the curvature of an interface from a digital 2D image

In this paper a method for the estimation of the curvature along a condensed phase interface is presented. In a previous paper in this journal [1] a mathematical relationship was established between this curvature and a template disk located at a given point along the interface. The portion of the computed area of the template disk covering one of the phases was shown to be asymptotically linear in the mean curvature. Instead of utilizing this relationship, an empirical approach was proposed in [1] in order to compensate for discrete uncertainties. In this paper, we show that this linear relationship can be used directly along the interface avoiding the empirical approach proposed earlier. Modifications of the algorithm are however needed, and with good data smoothing techniques, our method provides good quantitative curvature estimates.
Date: October 15, 2008
Creator: Frette, O.I.; Virnovsky, G. & Silin, D.
Object Type: Article
System: The UNT Digital Library
Predictability and Diagnosis of Low-Frequency Climate Processes in the Pacific (open access)

Predictability and Diagnosis of Low-Frequency Climate Processes in the Pacific

Predicting the climate for the coming decades requires understanding both natural and anthropogenically forced climate variability. This variability is important because it has major societal impacts, for example by causing floods or droughts on land or altering fishery stocks in the ocean. Our results fall broadly into three topics: evaluating global climate model predictions; regional impacts of climate changes over western North America; and regional impacts of climate changes over the eastern North Pacific Ocean.
Date: October 15, 2008
Creator: Miller, Dr. Arthur J.
Object Type: Report
System: The UNT Digital Library