Partner
UNT Libraries Government Documents Department
280
Oklahoma Historical Society
60
UNT Libraries Special Collections
25
National Museum of the Pacific War/Admiral Nimitz Foundation
13
Sterling Municipal Library
12
Dallas Area Rapid Transit (DART)
8
Carl Albert Congressional Research and Studies Center
6
UNT Libraries
6
UNT Music Library
6
Alvin Community College
5
50 More
Collection
Office of Scientific & Technical Information Technical Reports
190
Texas Digital Newspaper Program
121
Tocker Foundation Grant
69
Oklahoma Digital Newspaper Program
67
Government Accountability Office Reports
45
Congressional Research Service Reports
40
KXAS-NBC 5 News Collection
18
National Museum of the Pacific War Oral History Collection
13
National Museum of the Pacific War Digital Archive
13
The Baytown Sun
12
82 More
Year
Month
Day
Language
High Pressure Coal Combustion Kinetics Project Quarterly Report
The HPCCK project was initiated with a kickoff meeting held on June 12, 2001 in Morgantown, WV, which was attended by all project participants. SRI's existing g-RCFR reactor was reconfigured to a SRT-RCFR geometry (Task 1.1). This new design is suitable for performing the NBFZ experiments of Task 1.2. It was decided that the SRT-RCFR apparatus could be modified and used for the HPBO experiments. The purchase, assembly, and testing of required instrumentation and hardware is nearly complete (Task 1.1 and 1.2). Initial samples of PBR coal have been shipped from FWC to SRI (Task 1.1). The ECT device for coal flow measurements used at FWC will not be used in the SRI apparatus and a screw type feeder has been suggested instead (Task 5.1). NEA has completed a upgrade of an existing Fluent simulator for SRI's RCFR to a version that is suitable for interpreting results from tests in the NBFZ configuration (Task 1.3) this upgrade includes finite-rate submodels for devolatilization, secondary volatiles pyrolysis, volatiles combustion, and char oxidation. Plans for an enhanced version of CBK have been discussed and development of this enhanced version has begun (Task 2.5). A developmental framework for implementing pressure and oxygen effects on …
Date:
September 15, 2001
Creator:
Guenther, Chris & Rogers, Bill
Object Type:
Report
System:
The UNT Digital Library
High Frequency Electromagnetic Impedance Imaging for Vadose Zone and Groundwater Characterization
Accurate description of transport pathways on the gross scale, the location of contamination, and characterization of heterogeneity within the vadose zone, are now realized as vital for proper treatment, confinement and stabilization of subsurface contamination at Department of Energy (DOE) waste sites. Electromagnetic (EM) methods are ideal for these tasks since they are directly sensitive to the amount of fluid present in porous media, as well as fluid composition. At many DOE sites it is necessary to employ lower frequency (<1 MHz) or diffusive electromagnetic fields because of the inability of ground penetrating radar (GPR) to penetrate to sufficient depths. The high frequency impedance method, which operated in the diffusive frequency range (10 Hz to 1 MHz), as well as the low end of the spectrum employed by GPR (1MHz-10 MHz), is an ideal technique to delineate and map the aforementioned targets. The method has clearly shown the potential to provide needed information on variations in subsurface saturation due to local storage tanks and perched water zones, as well as mapping geological structures related to the subsurface hydrological properties and heterogeneity within the vadose zone. Although it exhibits certain advantages over other EM methods, the impedance method comes with a …
Date:
June 15, 2001
Creator:
Newman, Gregory A.; Nichols, Edward; Alumbaugh, David L. & Hoversten, G. Michael
Object Type:
Report
System:
The UNT Digital Library
Whole genome amplification - Review of applications and advances
The concept of Whole Genome Amplification is something that has arisen in the past few years as modifications to the polymerase chain reaction (PCR) have been adapted to replicate regions of genomes which are of biological interest. The applications here are many--forensics, embryonic disease diagnosis, bio terrorism genome detection, ''imoralization'' of clinical samples, microbial diversity, and genotyping. The key question is if DNA can be replicated a genome at a time without bias or non random distribution of the target. Several papers published in the last year and currently in preparation may lead to the conclusion that whole genome amplification may indeed be possible and therefore open up a new avenue to molecular biology.
Date:
November 15, 2001
Creator:
Hawkins, Trevor L.; Detter, J.C. & Richardson, Paul
Object Type:
Article
System:
The UNT Digital Library
Magnetic bead purification of labeled DNA fragments forhigh-throughput capillary electrophoresis sequencing
We have developed an automated purification method for terminator sequencing products based on a magnetic bead technology. This 384-well protocol generates labeled DNA fragments that are essentially free of contaminates for less than $0.005 per reaction. In comparison to laborious ethanol precipitation protocols, this method increases the phred20 read length by forty bases with various DNA templates such as PCR fragments, Plasmids, Cosmids and RCA products. Our method eliminates centrifugation and is compatible with both the MegaBACE 1000 and ABIPrism 3700 capillary instruments. As of September 2001, this method has produced over 1.6 million samples with 93 percent averaging 620 phred20 bases as part of Joint Genome Institutes Production Process.
Date:
September 15, 2001
Creator:
Elkin, Christopher; Kapur, Hitesh; Smith, Troy; Humphries, David; Pollard, Martin; Hammon, Nancy et al.
Object Type:
Article
System:
The UNT Digital Library
Final Technical Report for DOE Grant DE-FG02-91ER20038
The existence of species within the plant genus Flaveria with differing leaf cell arrangements and photosynthetic schemes (C3, C4, C3-C4) enabled us to identify genetic elements (promoters, 3'UTRs) that are responsible for the regulation of pre-existing metabolic genes in the pattern required for the high-efficiency C4 photosynthetic scheme. We analyzed DNA elements regulating the rbcS, malic enzyme, and malate dehydrogenase gene families in several species of Flaveria, using transient and stable transformation methods.
Date:
March 15, 2001
Creator:
Nelson, T. M.
Object Type:
Report
System:
The UNT Digital Library
METAL ION ANALYSIS USING NEAR-INFRARED DYES AND THE ''LABORATORY-ON-A-CHIP''
The DOE currently has the daunting task of deactivating 7,000 contaminated buildings and decommissioning 900 contaminated buildings that remain from the United States' involvement in nuclear weapons development over the last 50 years.1 In addition to decontaminating the metal and concrete building materials that comprise these building structures, this program will require the decontamination and disposal of more than 180,000 metric tons of scrap metal.1 The DOE is also currently entrenched in a massive cleanup program of their nuclear weapons facilities in an effort to prevent serious environmental problems arising from the already widespread contamination of soils, sediments and groundwaters. Incredibly, more than 600 billion gallons of water and 50 million cubic meters of soil have been contaminated by more than 5700 known DOE groundwater plumes.2 The primary concern is migration of these plumes and their potential threat to local and regional water sources. Sites of particular concern include the Snake River Aquifer in Idaho, contaminated groundwaters at the 100, 200 and 300 areas at Hanford, Washington, Oak Ridge/Savannah River groundwaters and contaminated sediments at the Nevada Test Site.2 Numerous landfills also exist at DOE facilities which are estimated to contain over three million cubic meters of radioactive and hazardous …
Date:
September 15, 2001
Creator:
Collins, Greg E.
Object Type:
Report
System:
The UNT Digital Library
CALCIUM CARBONATE PRODUCTION BY COCCOLITHOPHORID ALGAE IN LONG TERM, CARBON DIOXIDE SEQUESTRATION
Predictions of increasing levels of anthropogenic carbon dioxide (CO{sub 2}) and the specter of global warming have intensified research efforts to identify ways to sequester carbon. A number of novel avenues of research are being considered, including bioprocessing methods to promote and accelerate biosequestration of CO{sub 2} from the environment through the growth of organisms such as coccolithophorids, which are capable of sequestering CO{sub 2} relatively permanently. Calcium and magnesium carbonates are currently the only proven, long-term storage reservoirs for carbon. Whereas organic carbon is readily oxidized and releases CO{sub 2} through microbial decomposition on land and in the sea, carbonates can sequester carbon over geologic time scales. This proposal investigates the use of coccolithophorids--single-celled, marine algae that are the major global producers of calcium carbonate--to sequester CO{sub 2} emissions from power plants. Cultivation of coccolithophorids for calcium carbonate (CaCO{sub 3}) precipitation is environmentally benign and results in a stable product with potential commercial value. Because this method of carbon sequestration does not impact natural ecosystem dynamics, it avoids controversial issues of public acceptability and legality associated with other options such as direct injection of CO{sub 2} into the sea and ocean fertilization. Consequently, cultivation of coccolithophorids could be carried …
Date:
December 15, 2001
Creator:
V.J. Fabry, Ph.D.
Object Type:
Report
System:
The UNT Digital Library
A case study review of technical and technology issues for transition of a utility load management program to provide system reliability resources in restructured electricity markets
Utility load management programs--including direct load control and interruptible load programs--were employed by utilities in the past as system reliability resources. With electricity industry restructuring, the context for these programs has changed; the market that was once controlled by vertically integrated utilities has become competitive, raising the question: can existing load management programs be modified so that they can effectively participate in competitive energy markets? In the short run, modified and/or improved operation of load management programs may be the most effective form of demand-side response available to the electricity system today. However, in light of recent technological advances in metering, communication, and load control, utility load management programs must be carefully reviewed in order to determine appropriate investments to support this transition. This report investigates the feasibility of and options for modifying an existing utility load management system so that it might provide reliability services (i.e. ancillary services) in the competitive markets that have resulted from electricity industry restructuring. The report is a case study of Southern California Edison's (SCE) load management programs. SCE was chosen because it operates one of the largest load management programs in the country and it operates them within a competitive wholesale electricity market. …
Date:
July 15, 2001
Creator:
Weller, G. H.
Object Type:
Report
System:
The UNT Digital Library
Quantifying Silica Reactivity in Subsurface Environments: An Integrated Experimental Study of Quartz and Amorphous Silica to Establish a Baseline for Glass Durability
An immediate EM science need is a reliable kinetic model that predicts long-term waste glass performance. A framework for which the kinetics of mineral-solution reactions can be used to interpret complex silicate glass properties is required to accurately describe the current and future behavior of glasses as synthetic monoliths or natural analogs. Reaction rates and mechanisms are essential elements in deciphering mineral/material reactivity trends within a compositional series or across a matrix of complex solution compositions. An essential place to start, and the goal of this research, is to quantify the reactivity of crystalline and amorphous SiO2 phases in the complex fluids of natural systems.
Date:
June 15, 2001
Creator:
Dove, Patricia M.
Object Type:
Report
System:
The UNT Digital Library
A molecular link between stem cell regulation and floral patterning in Arabidopsis.
OAK-B135 The homeotic gene AGAMOUS (AG) has dual roles in specifying floral organ fate and limiting stem cell proliferation in Arabidopsis flowers. We show here that the floral identity protein LEAFY (LFY), a transcription factor expressed throughout the flower, acts together with the homeodomain protein WUSCHEL (WUS) to activate AG in the center of flowers. WUS was previously identified because of its role in maintaining a stem cell population in the center of both shoot and floral meristems. The unsuspected additional role of WUS in regulating floral homeotic gene expression supports the hypothesis that floral patterning makes use of a general meristem patterning system that was present before flowers evolved. We also show that AG represses WUS at later stages of floral development, thus creating a negative feedback loop that is required for the determinate growth of floral meristems.
Date:
June 15, 2001
Creator:
Lohmann, J. U., Hong, R. L., Hobe, M., Busch, M. A., Parcy, F., Simon, R., and Weigel, D.
Object Type:
Article
System:
The UNT Digital Library
Strategies for coupling energy simulation and computational fluiddynamics programs
None
Date:
June 15, 2001
Creator:
Zhai, Zhiqiang; Chen, Qingyan; Klems, Joseph H. & Haves, Philip
Object Type:
Article
System:
The UNT Digital Library
A TRANSPORTATION RISK ASSESSMENT TOOL FOR ANALYZING THE TRANSPORT OF SPENT NUCLEAR FUEL AND HIGH-LEVEL RADIOACTIVE WASTE TO THE PROPOSED YUCCA MOUNTAIN REPOSITORY
The Yucca Mountain Draft Environmental Impact Statement (DEIS) analysis addressed the potential for transporting spent nuclear fuel and high-level radioactive waste from 77 origins for 34 types of spent fuel and high-level radioactive waste, 49,914 legal weight truck shipments, and 10,911 rail shipments. The analysis evaluated transportation over 59,250 unique shipment links for travel outside Nevada (shipment segments in urban, suburban or rural zones by state), and 22,611 links in Nevada. In addition, the analysis modeled the behavior of 41 isotopes, 1091 source terms, and used 8850 food transfer factors (distinct factors by isotope for each state). The analysis also used mode-specific accident rates for legal weight truck, rail, and heavy haul truck by state, and barge by waterway. This complex mix of data and information required an innovative approach to assess the transportation impacts. The approach employed a Microsoft{reg_sign} Access database tool that incorporated data from many sources, including unit risk factors calculated using the RADTRAN IV transportation risk assessment computer program. Using Microsoft{reg_sign} Access, the analysts organized data (such as state-specific accident and fatality rates) into tables and developed queries to obtain the overall transportation impacts. Queries are instructions to the database describing how to use data contained …
Date:
February 15, 2001
Creator:
NA
Object Type:
Report
System:
The UNT Digital Library
Miniature Chemical Sensor Combining Molecular Recognition with Evanescent Wave Cavity Ring-Down Spectroscopy
To address DOE's chemical sensing needs, a new class of chemical sensors is being developed to enable qualitative and quantitative, remote, real-time, optical diagnostics of chemical species in hazardous gas, liquid, and semi-solid phases by employing evanescent wave cavity ring-down spectroscopy (EWCRDS). The sensitivity of EW-CRDS was demonstrated previously under Project No.60231. The objective of this project is to achieve highly selective chemical detection in a complex matrix of interferants by combining EW-CRDS with molecular recognition (MR) chemistry and by exploiting the polarization dependence of EW-CRDS to enhance optical selectivity.
Date:
June 15, 2001
Creator:
Pipino, Andrew C. R.
Object Type:
Report
System:
The UNT Digital Library
U.S. Commission on National Security/21st Century
The USCNS/21 is charged with thinking comprehensively and creatively about how the United States should provide for its national security in the 21st century.
Date:
February 15, 2001
Creator:
U.S. Commission on National Security/21st Century
Object Type:
Website
System:
The UNT Digital Library
Final report. [Impact of tropospheric aerosols on the past surface radiation income: Calibration with ARM site data]
This work involved a comparison of surface solar radiation observations from the SOCMET-DATA BASE from 1960-1990 and results from a General Circulation Model to test and evaluate the effects of tropospheric aerosols on clouds.
Date:
March 15, 2001
Creator:
Kukla, George
Object Type:
Report
System:
The UNT Digital Library
Reduction in Defect Content of ODS Alloys
The work detailed within this report is a continuation of earlier work carried out under contract number 1DX-SY382V. The earlier work comprises a literature review of the sources and types of defects found principally in Fe-based ODS alloys as well as experimental work designed to identify defects in the prototype ODS-Fe{sub 3}Al alloy, deduce their origins and to recommend methods of defect reduction. The present work is an extension of the experimental work already reported and concentrates on means of reduction of defects already identified rather than the search for new defect types. This report also includes results gathered during powder separation trials, conducted by the University of Groningen, Netherlands and coordinated by the University of Liverpool, involving the separation of different metallic powders in terms of their differing densities. The scope and objectives of the present work were laid out in the technical proposal ''Reduction in Defect Content in ODS Alloys-III''. All the work proposed in the ''Statement of Work'' section of the technical proposal has been carried out and all work extra to the ''Statement of Work'' falls within the context of an ODS-Fe{sub 3}Al alloy of improved overall quality and potential creep performance in the consolidated form. …
Date:
May 15, 2001
Creator:
Ritherdon, J.
Object Type:
Report
System:
The UNT Digital Library
A Development of On-Line Temperature Measurement Instrumentation for Gasification Process Control Progress Report
This progress report covers continuing work to develop a temperature probe for a coal gasifier. A workable probe design requires finding answers to crucial questions involving the probe materials. We report on attempts to answer those questions. We attempted to measure the laser-input power at a wavelength of 355 nm that would damage the ends of sapphire fiber optics. We were surprised and pleased to learn that they survived an input power density of about 3 x 10{sup 9} W/cm{sup 2}, which greatly exceeds the best that fused-silica fibers can do. During a run of our new simulator to obtain an upgraded calibration curve for the improved YAG:Dy phosphors, we found that the phosphor appeared to form a eutectic, with the fused-silica cuvette used to hold the phosphor, when the temperature exceeded 1450 C. This result could have substantial ramifications in this and other high-temperature applications. Our new proprietary detector package that replaced the original photomultiplier tube gave excellent results, with much better signal-to-noise ratio at a given temperature than the old package. Our new plasma-spraying operation has succeeded in spraying YAG, which we think may be a technological breakthrough.
Date:
April 15, 2001
Creator:
Noel, Bruce W.
Object Type:
Report
System:
The UNT Digital Library
Final evaluation & test report for the standard waste box (docket 01-53-7A) type A packaging
This report documents the U.S. Department of Transportation Specification 7A Type A compliance test and evaluation results of the Standard Waste Box. Testing and evaluation activities documented herein are on behalf of the U.S. Department of Energy-Headquarters, Office of Safety, Health and Security (EM-5), Germantown, Maryland. Duratek Federal Services, Inc., Northwest Operations performed an evaluation of the changes as documented herein under Docket 01-53-7A.
Date:
October 15, 2001
Creator:
KELLY, D L
Object Type:
Report
System:
The UNT Digital Library
Final Report. SFAA No. DEFC02-98CH10961. Technical assistance for joint implementation and other supporting mechanisms and measures for greenhouse gas emissions mitigation
IIEC, a division of CERF, has developed an extensive base of experience implementing activities that support climate action by developing USIJI projects in transitional countries within Asia, Latin America, Central and Eastern Europe, and southern Africa. IIEC has been able to provide a range of technical and policy assistance to governments and industry in support of sustainable energy use. IIEC continues to work in key countries with local partners to develop and implement energy efficiency policies and standards, develop site-specific projects, and assist governing bodies to establish national priorities and evaluation criteria for approving GHG-mitigation projects. As part of this project, IIEC focused on promoting a series of activities in Thailand and South Africa in order to identify GHG mitigation projects and work within the national approval process of those countries. The sections of this report outline the activities conducted in each country in order to achieve that goal.
Date:
October 15, 2001
Creator:
Knight, Denise
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report
Roof bolting is the most popular method for underground openings in the mining industry, especially in the bedded deposits such as coal, potash, salt etc. In fact, all U.S. underground coal mine entries are roof-bolted as required by law. However, roof falls still occur frequently in the roof bolted entries. The two possible reasons are: the lack of knowledge of and technology to detect the roof geological conditions in advance of mining, and lack of roof bolting design criteria for modern roof bolting systems. This research is to develop a method for predicting the roof geology and stability condition in real time during roof bolting operation. Based on such information, roof bolting design criteria for modern roof bolting systems will be developed for implementation in real time. The retrofitting works for a dedicated roof bolter for this research has been completed. The laboratory tests performed using this machine on simulated roof blocks have been conducted. The analysis performed on the testing data showed promising signs to detect the rock interface, fractures, as well as the rock types. The other tasks were progressing as planned.
Date:
October 15, 2001
Creator:
Peng, Syd S.
Object Type:
Report
System:
The UNT Digital Library
CALORIMETRY FOR GLOBAL MEASUREMENTS IN PHENIX.
The charged particle multiplicity, dN{sub ch}/d{eta}, and transverse energy, E{sub t}, are fundamental aspects of Heavy Ion collisions which PHENIX has measured in Au-Au collisions at a center-of-mass (c.m.s.) energy {radical}s{sub N}N = 130 GeV. E{sub t} is a multiparticle global observable related, through the Bjorken relation, to the maximum energy density achieved in the collision. For a given c.m.s. energy, the multiplicity and transverse energy are expected to increase with the number of nucleons participating in a collision (n{sub part}). The dependence on n{sub part} is found to be (dE{sub t}/d{eta}, dN{sub ch}/d{eta}) {approx} n{sub part}{sup {alpha}}, where {alpha} is larger than unity. This rapid growth (i.e. more rapid than linear) is not surprising in the collision of large nuclei since an individual participant nucleon may undergo more than one collision. The variable n{sub collision} is also introduced to denote the number of binary collisions. Whereas n{sub part} can be directly measured, in principle, directly from the number of non-participating nucleons detected in the forward direction, n{sub collision} is not observable but can be calculated statistically from n{sub part}, using the Glauber model.
Date:
January 15, 2001
Creator:
WHITE,S.N. FOR PHENIX COLLABORATION
Object Type:
Article
System:
The UNT Digital Library
Determination of the Rate of Formation of Hydroceramic Waste Forms made with INEEL Calcined Wastes
The formulation, synthesis, characterization and hydration kinetics of hydroceramic waste forms designed as potential hosts for existing INEEL calcine high-level wastes have been established as functions of temperature and processing time. Initial experimentations were conducted with several aluminosilicate pozzolanic materials, ranging from fly ash obtained from various power generating coal and other combustion industries to reactive alumina, natural clays and ground bottled glass powders. The final selection criteria were based on the ease of processing, excellent physical properties and chemical durability (low-leaching) determined from the PCT test produced in hydroceramic. The formulation contains vermiculite, Sr(NO32), CsC1, NaOH, thermally altered (calcined natural clay) and INEEL simulated calcine high-level nuclear wastes and 30 weight percent of fluorinel blend calcine and zirconia calcine. Syntheses were carried out at 75-200 degree C at autogeneous water pressure (100% relative humidity) at various time intervals. The resulting monolithic compact products were hard and resisted breaking when dropped from a 5 ft height. Hydroceramic host mixed with fluorinel blend calcine and processed at 75 degree C crumbled into rice hull-side grains or developed scaly flakes. However, the samples equally possessed the same chemical durability as their unbroken counterparts. Phase identification by XRD revealed that hydroceramic host crystallized …
Date:
October 15, 2001
Creator:
Scheetz, Barry & Olanrewaju, Johnson
Object Type:
Report
System:
The UNT Digital Library
Methodology Used for Total System Performance Assessment of the Potential Nuclear Waste Repository at Yucca Mountain (USA)
The U.S. Department of Energy and its contractors are currently evaluating a site in Nevada (Yucca Mountain) for disposal of high-level radioactive waste from U.S. commercial nuclear plants and U.S. government-owned facilities. The suitability of the potential geologic repository is assessed, based on its performance in isolating the nuclear waste from the environment. Experimental data and models representing the natural and engineered barriers are combined into a Total System Performance Assessment (TSPA) model [1]. Process models included in the TSPA model are unsaturated zone flow and transport, thermal hydrology, in-drift geochemistry, waste package degradation, waste form degradation, engineered barrier system transport, saturated zone flow and transport, and biosphere transport. Because of the uncertainty in the current data and in the future evolution of the total system, simulations follow a probabilistic approach. Multiple realization simulations using Monte Carlo analysis are conducted over time periods of up to one million years, which estimates a range of possible behaviors of the repository. The environmental impact is measured primarily by the annual dose received by an average member of a critical population group residing 20 km down-gradient of the potential repository. In addition to the nominal scenario, other exposure scenarios include the possibility of …
Date:
March 15, 2001
Creator:
Devibec, E.; Sevougian, S. D.; Mattie, P. D.; McNeish, J. A. & Mishra, S.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report
In this quarter, the research effort is to develop the drill control unit (DCU) that acquire, store drilling parameters and control the drilling operation. The relevant publications have been reviewed and the methodology developed by previous researchers has been evaluated using the collected data in our laboratory and field tests conducted prior to the start of this project. Numerical modeling for exploring roof bolting mechanism has been started.
Date:
April 15, 2001
Creator:
Peng, Syd S.
Object Type:
Report
System:
The UNT Digital Library