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Advanced Hydrogen Transport Membranes for Vision 21 Fossil Fuel Plants
Eltron Research Inc., and team members, are developing an environmentally benign, inexpensive, and efficient method for separating hydrogen from gas mixtures produced during industrial processes, such as coal gasification. This project was motivated by the National Energy Technology Laboratory (NETL) Vision 21 initiative which seeks to economically eliminate environmental concerns associated with the use of fossil fuels. This objective is being pursued using dense membranes based in part on Eltron-patented ceramic materials with a demonstrated ability for proton and electron conduction. The technical goals are being addressed by modifying single-phase and composite membrane composition and microstructure to maximize proton and electron conductivity without loss of material stability. Ultimately, these materials must enable hydrogen separation at practical rates under ambient and high-pressure conditions, without deactivation in the presence of feedstream components such as carbon dioxide, water, and sulfur. During this quarter, it was demonstrated that increasing the transition metal loading in a model perovskite composition resulted in an increase in hydrogen flux. Improved flux corresponded to the emergence of additional phases in the ceramic membrane, and highest flux was achieved for a composite consisting of pseudo-cubic and rhombohedral perovskite phases. A 0.9-mm thick membrane of this material generated a hydrogen flux …
Date:
April 30, 2001
Creator:
Roark, Shane E.; Sammells, Tony F.; Calihman, Adam E.; Pitzman, Lyrik Y.; Calcar, Pamela M. Van; Mackay, Richard A. et al.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 102, No. 40, Ed. 1 Monday, April 30, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 30, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Sun (Alvin, Tex.), Vol. 110, No. 35, Ed. 1 Monday, April 30, 2001
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
April 30, 2001
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
AMBIENT PM2.5 SAMPLING AND ANALYSIS
This is the third semi-annual technical progress report summarizing observations and tentative conclusions drawn from evaluations of the data captured to date from the operation of the ambient PM{sub 2.5} speciation sites in a geographical area encompassing southeastern Ohio, western Pennsylvania, and northwestern West Virginia. The overall goal of this program, called the Upper Ohio River Valley Project (UORVP), is to better understand the relationship between coal-based power system emissions and ambient air quality in the upper Ohio River Valley region through the collection of chemically resolved or speciated data. In order to provide a ''stand alone'' document, this report contains updated versions of Section 1 (Introduction) and Section 2 (Experimental) in their entirety from the first report.
Date:
April 30, 2001
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
AMBIENT PM2.5 SAMPLING AND ANALYSIS
This is the third semi-annual technical progress report summarizing observations and tentative conclusions drawn from evaluations of the data captured to date from the operation of the ambient PM{sub 2.5} speciation sites in a geographical area encompassing southeastern Ohio, western Pennsylvania, and northwestern West Virginia. The overall goal of this program, called the Upper Ohio River Valley Project (UORVP), is to better understand the relationship between coal-based power system emissions and ambient air quality in the upper Ohio River Valley region through the collection of chemically resolved or speciated data. In order to provide a ''stand alone'' document, this report contains updated versions of Section 1 (Introduction) and Section 2 (Experimental) in their entirety from the first report.
Date:
April 30, 2001
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Applied techniques for high bandwidth data transfers across wide area networks
Large distributed systems such as Computational/Data Grids require large amounts of data to be co-located with the computing facilities for processing. Ensuring that the data is there in time for the computation in today's Internet is a massive problem. From our work developing a scalable distributed network cache, we have gained experience with techniques necessary to achieve high data throughput over high bandwidth Wide Area Networks (WAN). In this paper, we discuss several hardware and software design techniques and issues, and then describe their application to an implementation of an enhanced FTP protocol called GridFTP. We also describe results from two applications using these techniques, which were obtained at the Supercomputing 2000 conference.
Date:
April 30, 2001
Creator:
Lee, Jason; Gunter, Dan; Tierney, Brian; Allcock, Bill; Bester, Joe; Bresnahan, John et al.
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 155, Ed. 1 Monday, April 30, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
April 30, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Characterization of Contaminant Transport using Naturally-Occurring U-Series Disequilibria - Final Report - 05/01/1997 - 04/30/2001
The interactions of mixed wastes containing radionuclides with solid rock surface and the mobility of the radionuclides in aquifer systems depend not only on the chemistry of the nuclides and the physico-chemical effects of radioactive decay, but also on the site-specific hydrogeology. Thus, to characterize contaminant transport, it is best to cross-check figures derived from any small-scale laboratory experiments over limited times with that obtained from field-oriented, natural analog studies. We propose such a study using the naturally-occurring U and Th decay-series disequilibria. The work of ours and other researchers have shown that the parent/daughter disequilibrium patterns existing in groundwater systems can be modeled in terms of local nuclide mass balance to arrive at such information as the rock-water contact time (fluid flow) and rates of contaminant transport, taking into account the retardation effect due to nuclide/rock interaction contaminants at INEL by grouping them into three categories, represented by isotopes of (1) Th and Pa, (2) U and (3) Ra. Mass spectrometric measurements of these elements will be emphasized in order to minimize sample size requirements and to maximize precision. Results will form the data base for a model code for computing: (1) Fluid residence time (transport rates) in the …
Date:
April 30, 2001
Creator:
Murrell, Michael T. & Ku, Teh-Lung
Object Type:
Report
System:
The UNT Digital Library
Clean Cities National Partner Awards: Clean Cities Fact Sheet
This fact sheet briefly describes each of the 10 winners of the Clean Cities National Partner Awards.
Date:
April 30, 2001
Creator:
LaRocque, T.
Object Type:
Book
System:
The UNT Digital Library
COAL AND CHAR STUDIES BY ADVANCED EMR TECHNIQUES
Advanced electronic magnetic resonance (EMR) as well as nuclear magnetic resonance (NMR) methods have been used to examine properties of coals, chars, and molecular species related to constituents of coal. During the span of this grant, progress was made on construction and applications to coals and chars of two high frequency EMR systems particularly appropriate for such studies--48 GHz and 95 GHz electron magnetic resonance spectrometer, on new low-frequency dynamic nuclear polarization (DNP) experiments to examine the interaction between water and the surfaces of suspended char particulates in slurries, and on a variety of proton nuclear magnetic resonance (NMR) techniques to measure characteristics of the water directly in contact with the surfaces and pore spaces of carbonaceous particulates.
Date:
April 30, 2001
Creator:
Belford, R. Linn; Clarkson, Robert B.; Nilges, Mark J.; Odintsov, Boris M. & Smirnov, Alex I.
Object Type:
Report
System:
The UNT Digital Library
A Complex Exposure History of the Gold Basin L4-Chondrite Shower from Cosmogenic Radionuclides and Noble Gases
Gold Basin is a large L4 chondrite shower, that was recently discovered in the Mojave Desert, Arizona [1]. Based on {sup 109}Be and {sup 14}C concentrations in several fragments, the pre-atmospheric radius of this shower was estimated to be 3-4 meters [2]. Among chondrites, Gold Basin is one of the largest, thus providing a unique opportunity for comparing measured cosmogenic nuclide concentrations with model calculations for large objects. Noble gas measurements combined with {sup 10}Be data of most Gold Basin samples suggest a single-stage exposure of 15-30 Myr, although a few samples may require a complex exposure history [3]. We selected eight samples of the Gold Basin shower that were analyzed for noble gases; these samples represent a wide range of shielding depths.
Date:
April 30, 2001
Creator:
Welten, K. C.; Nishiizumi, K.; Caffee, M. W.; Masarik, J. & Wieler, R.
Object Type:
Article
System:
The UNT Digital Library
Computer-Based Patient Records: Better Planning and Oversight By VA, DOD, and IHS Would Enhance Health Data Sharing
A letter report issued by the General Accounting Office with an abstract that begins "In November 1997, the President called for the Department of Veterans Affairs (VA) and the Department of Defense (DOD) to create an interface that would allow the two agencies to share patient health information. By allowing health care providers to electronically share comprehensive patient information, computer-based patient record's (GCPR) should help VA, DOD, and the Indian Health Service (IHS) to improve the quality of care for their beneficiaries. But without a lead entity, a clear mission, and detailed planning to achieve that mission, it is difficult to monitor progress, identify project risks, and develop appropriate contingency plans to keep the project moving forward and on track. Critical project decisions were not made, and the agencies were not bound by those that were made. The VA and DOD Chief Information Officers' (CIO) action to focus on short-term deliverables and to capitalize on existing technologies is warranted and a step in the right direction. However, until problems with the two agencies' existing systems and issues regarding planning, management, and accountability are resolved, project costs will likely continue to increase and implementation of the larger GCPR effort--and its expected …
Date:
April 30, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
COOPERATIVE RESEARCH IN C1 CHEMISTRY
Faculty and students from five universities (Kentucky, West Virginia, Utah, Pittsburgh and Auburn) are collaborating on a basic research program to develop novel C1 chemistry processes for the production of clean, high quality transportation fuel. An Industrial Advisory Board (IAB) with members from Chevron, Eastman Chemical, Energy International, Teir Associates, and the Department of Defense has been formed to provide practical guidance to the program. The program has two principal objectives. (1) Develop technology for conversion of C1 source materials (natural gas, synthesis gas, carbon dioxide and monoxide, and methanol) into clean, high efficiency transportation fuel. (2) Develop novel processes for producing hydrogen from natural gas and other hydrocarbons. Some of the principal accomplishments of the program in its first two years are: (1) The addition of acetylenic compounds in Fischer-Tropsch synthesis is found to produce significant amounts of oxygenated products in FT diesel fuels. Such oxygenated products should decrease particulate matter (PM) emissions. (2) Nanoscale, binary, Fe-based catalysts supported on alumina have been shown to have significant activity for the decomposition of methane into pure hydrogen and potentially valuable multi-walled carbon nanotubes. (3) Catalytic synthesis processes have been developed for synthesis of diethyl carbonate, higher ethers, and higher alcohols …
Date:
April 30, 2001
Creator:
Huffman, Gerald P.
Object Type:
Report
System:
The UNT Digital Library
Daily Journal (Perry, Okla.), Vol. 108, No. 85, Ed. 1 Monday, April 30, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 30, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
DART joins Mexican tradition at area events
News release about Cinco de Mayo celebrations in Dallas.
Date:
April 30, 2001
Creator:
Lyons, Morgan
Object Type:
Text
System:
The Portal to Texas History
DESIGN AND DEVELOPMENT OF GAS-LIQUID CYLINDRICAL CYCLONE COMPACT SEPARATORS FOR THREE-PHASE FLOW
This report presents a brief overview of the activities and tasks accomplished during the first half year (October 1, 2000-March 31, 2001) of the fourth project year budget period (October 1, 2000-September 30, 2001). An executive summary is presented initially followed by the tasks of the current budget period. Then, detailed description of the experimental and modeling investigations are presented. Subsequently, the technical and scientific results of the activities of this project period are presented with some discussions. The findings of this investigation are summarized in the ''Conclusions'' section followed by relevant references. The fourth project year activities are divided into three main parts, which are carried out in parallel. The first part is continuation of the experimental program that includes a study of the oil/water two-phase behavior at high pressures and control system development for the three-phase GLCC{copyright}. This investigation will be eventually extended for three-phase flow. The second part consists of the development of a simplified mechanistic model incorporating the experimental results and behavior of dispersion of oil in water and water in oil. This will provide an insight into the hydrodynamic flow behavior and serve as the design tool for the industry. Although useful for sizing GLCC{copyright} …
Date:
April 30, 2001
Creator:
Mohan, Dr. Ram S. & Shoham, Dr. Ovadia
Object Type:
Report
System:
The UNT Digital Library
DEVELOPMENT OF A VALIDATED MODEL FOR USE IN MINIMIZING NOx EMISSIONS AND MAXIMIZING CARBON UTILIZATION WHEN CO-FIRING BIOMASS WITH COAL
This is the second Quarterly Technical Report for DOE Cooperative Agreement No. DE-FC26-00NT40895. A statement of the project objectives is included in the Introduction of this report. Two biomass co-firing test burns have been conducted. In the first test, up to 20% by weight dry hardwood sawdust and dry switchgrass was co-milled Pratt seam coal. In the second test, also with Pratt seam coal, up to 10% by weight dry hardwood sawdust was injected through the center of the burner. Progress has continued in developing a modeling approach to synthesize the reaction time and temperature distributions that will be produced by computational fluid dynamic models of the pilot-scale combustion furnace and the char burnout and chemical reaction kinetics that will predict NOx emissions and unburned carbon levels in the furnace exhaust. Preliminary results of CFD modeling efforts have been received and Preparations are under way for continued pilot-scale combustion experiments.
Date:
April 30, 2001
Creator:
Felix, Larry G. & Bush, P. Vann
Object Type:
Report
System:
The UNT Digital Library
Development of ITM Oxygen Technology for Integration in IGCC & Other Advanced Power Generation Systems (ITM Oxygen) Progress Report
None
Date:
April 30, 2001
Creator:
Richards, Robin E.
Object Type:
Report
System:
The UNT Digital Library
Development of novel strategies for enhancing the cycle life of lithium solid polymer electrolyte batteries. Final report
Lithium/solid polymer electrolyte (Li/SPE) secondary batteries are under intense development as power sources for portable electronic devices as well as electric vehicles. These batteries offer high specific energy, high energy density, very low self-discharge rates, and flexibility in packaging; however, problems have inhibited their introduction into the marketplace. This report summarizes findings to examine processes that occur with Li/SPE secondary batteries upon cyclic charging/discharging. The report includes a detailed analysis of the impedance measured on the Li/SPE/IC and IC/SPE/IC systems. The SPE was a derivative of methoxyethoxyethoxyphosphazene (MEEP) with lithium triflate salt as the electrolyte, while the intercalated cathodes (IC) comprised mixtures of manganese dioxide, carbon powder, and MEEP as a binder. Studies on symmetrical Li/SPE/Li laminates show that cycling results in a significant expansion of the structure over the first few tens of cycles; however, no corresponding increase in the impedance was noted. The cycle life of the intercalation cathode was found to be very sensitive to the method of fabrication. Results indicate that the cycle life is due to the failure of the IC, not to the failure of the lithium/SPE interface. A pattern recognition neural network was developed to predict the cycle life of a battery from …
Date:
April 30, 2001
Creator:
Macdonald, Digby D.; Urquidi-Macdonald, Mirna; Allcock, Harry; Engelhard, George; Bomberger, N.; Gao, L. et al.
Object Type:
Report
System:
The UNT Digital Library
Development of ODS Heat Exchanger Tubing Progress Report
Work has begun under three major tasks of this project. With respect to increasing the circumferential strength of a MA956 tube, approximately 60 MA956 rods have been extruded using a 20:1 extrusion ratio and extrusion temperatures of 1000, 1075, 1150, and 1200 C. Also, creep testing is underway for the purpose of determining the ''stress threshold'' curves for this alloy. Regarding joining of the alloy MA956, work has begun on the friction welding, magnetic impulse welding, explosive welding, and transient liquid phase bonding aspects of this project. And finally, material is being prepared for the laboratory fire-side high temperature corrosion tests, with potential gas and deposits for a typical Vision 21 plant being reviewed for final determination of these variables in the test program.
Date:
April 30, 2001
Creator:
Harper, Mark A.
Object Type:
Report
System:
The UNT Digital Library
District of Columbia: Weaknesses in Financial Management System Implementation
A letter report issued by the General Accounting Office with an abstract that begins "The District of Columbia is acquiring a new financial management system to improve its accountability over government expenditures. This report assesses the status of the District of Columbia's implementation of important components of this system, including its new core general ledger System of Accounting and Reporting (SOAR). GAO found that although the District is in its fourth year of implementing its new financial management system, essential elements of the system are not yet operational. Two components of SOAR have not been fully implemented: the budget module is on hold, and the fixed assets module is incomplete. The implementation of the systems that feed into SOAR--personnel and payroll, procurement, and tax--is incomplete and the systems lack electronic interfaces with SOAR. Because the financial management system is incomplete, much of the District's financial management and budget information is produced through cumbersome, manual processes and the extraordinary efforts of a few key staff. District officials need to take time to assess the current status of the city's financial system, to identify problems, and to establish a disciplined process to address these problems through the completion of its financial systems …
Date:
April 30, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Effect of Microstructure on Low Temperature Cracking Behavior of EN82H Welds
As-fabricated EN82H welds are susceptible to low temperature embrittlements in 54 degree C hydrogenated water. Values of J[sub]IC in water are typically 90% to 98% lower than those in air due to a fracture mechanism transition from microvoid coalescence to hydrogen-included intergranular fracture. Environmental J[sub]IC testing demonstrated that a high temperature (1093 degree C) anneal and furnace-cool alleviates the material's susceptibility to hydrogen-induced intergranular cracking. To identify metallurgical and compositional features that are responsible for the material's environment-sensitive behavior, detailed characterization of the microstructure and grain boundary chemistry for the as-fabricated and as-annealed materials was performed. Results from light optical microscopy, analytical electron microscopy, electron probe microanalysis, Auger electron spectroscopy and mechanical property characterization are used to provide insight into the observed low temperature embrittlement phenomenon. The key microstructural feature responsible for low temperature cracking in as-fabricated welds appears to be fine niobium and titanium-rich carbonitrides that cover most grain boundaries. These precipitates are effective hydrogen traps that promote hydrogen-induced intergranular cracking. Dissolution the fine carbonitrides during the 1093 degree C anneal reduces grain boundary trapping sites, which accounts for the improved fracture resistance displayed by the annealed weld. The role of strength level in promoting low temperature embrittlement is …
Date:
April 30, 2001
Creator:
Mills, W. J.; Brown, C. M. & Burke, M. G.
Object Type:
Article
System:
The UNT Digital Library
Effects of temporal modeling on the statistical uncertainty of spatiotemporal distributions estimated directly from dynamic SPECT projections
Artifacts can result when reconstructing a dynamic image sequence from inconsistent single photon emission computed tomography (SPECT) projections acquired by a slowly rotating gantry. The artifacts can lead to biases in kinetic parameters estimated from time-activity curves generated by overlaying volumes of interest on the images. To overcome these biases in conventional image based dynamic data analysis, we have been investigating the estimation of time-activity curves and kinetic model parameters directly from dynamic SPECT projection data by modeling the spatial and temporal distribution of the radiopharmaceutical throughout the projected field of view. In previous work we developed computationally efficient methods for fully four-dimensional (4-D) direct estimation of spatiotemporal distributions [1] and their statistical uncertainties [2] from dynamic SPECT projection data, using a spatial segmentation and temporal B-splines. In addition, we studied the bias that results from modeling various orders of temporal continuity and using various time samplings [1]. In the present work, we use the methods developed in [1, 2] and Monte Carlo simulations to study the effects of the temporal modeling on the statistical variability of the reconstructed distributions.
Date:
April 30, 2001
Creator:
Reutter, Bryan W.; Gullberg, Grant T. & Huesman, Ronald H.
Object Type:
Article
System:
The UNT Digital Library
Elections Reform: Overview and Issues
This report discusses several issues as the Congress considers legislation to reform the voting process, a number of issues have emerged as part of the debate: the reliability of different types of voting technologies; voting problems and irregularities in the 2000 election; problems for militaryand overseas voters; the electoral college; and early media projections of election results.
Date:
April 30, 2001
Creator:
Coleman, Kevin J. & Fischer, Eric A.
Object Type:
Report
System:
The UNT Digital Library