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Advanced Direct Liquefaction Concepts Program Phase II
This report addresses the advanced direct liquefaction concepts program.
Date:
November 30, 2002
Creator:
Hu, J. L. & Lee, L. K.
Object Type:
Report
System:
The UNT Digital Library
Analysis of Gene Targeting & Nonhomologous End-joining. Final Report
Overall, we identified a number of new proteins that participate in nonhomologous end-joining and also in telomere addition to the ends of broken chromosomes. We showed that NHEJ is severely reduced in cells expressing both yeast mating-type genes and then went on to identify the NEJ1 gene that was under this control. We showed the epistasis relations among a set of mutations that impair telomere addition and we showed that there are in fact two pathways to repair broken chromosomes in the absence of telomerase. We characterized the DNA damage checkpoint pathway in response to a single broken chromosome and characterized especially the adaptation of cells arrested by an unrepaired DSB. We demonstrated that the DNA damage response is nuclear-limited. We showed adaptation defects for Tid1and Srs2 proteins and showed that Srs2 was also recovery-defective, even when DNA was repaired.
Date:
November 30, 2002
Creator:
Haber, J. E.
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 81, No. 4, Ed. 1 Saturday, November 30, 2002
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 30, 2002
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Defining the Effectiveness of UV Lamps Installed in Circulating Air Ductwork
Ultraviolet; UV; UVC; UVGI; HVAC; ductwork; mold; fungus; effectiveness; microbial; dose; irradiance; reflectance; bacillis; aspergillis
Date:
November 30, 2002
Creator:
VanOsdell, Douglas & Foarde, Karin
Object Type:
Report
System:
The UNT Digital Library
Defining the Effectiveness of UV Lamps Installed in Circulating Air Ductwork
Germicidal ultraviolet (UVGI) lamps have a long history of use for inactivating microbial aerosols. Most reports have focused on the control of infectious diseases, such as tuberculosis (TB), in the occupied spaces of medical facilities. Ventilation duct use of UVGI has been increasing. In-duct applications are generally more concerned with controlling environmental organisms than with controlling infections agents. This document reports the results of a project to investigate the ability of UVGI lamps to inactivate representative environmental microbial aerosols in ventilation ducts. During this research, UVGI lamps were experimentally demonstrated to inactivate bioaerosols composed of vegetative bacteria, bacteria spores, or fungal spores to a reproducible degree under conditions of fixed dose. Vegetative bacteria were most susceptible to UVGI, with bacteria and fungal spores being substantially more resistant. The performance equation commonly cited in the literature for UVGI inactivation was found to generally apply, provided its parameters were known. Revision of final report DOE/OR22674/610-40030-01. Revised table 5 on page 33.
Date:
November 30, 2002
Creator:
VanOsdell, Douglas & Foarde, Karin
Object Type:
Report
System:
The UNT Digital Library
Development of Advanced Technologies to Reduce Design, Fabrication and Construction Costs for Future Nuclear Power Plants
OAK-B135 This report presents a summation of the third and final year of a three-year investigation into methods and technologies for substantially reducing the capital costs and total schedule for future nuclear plants. In addition, this is the final technical report for the three-year period of studies.
Date:
November 30, 2002
Creator:
DE&S, Camillo A. DiNunzio Framatome ANP; NCSU, Dr. Abhinav Gupta Assistant Professor; Laboratories, Dr. Michael Golay Professor MIT Dr. Vincent Luk Sandia National; Systems, Rich Turk Westinghouse Electric Company Nuclear; Charles Morrow, Sandia National Laboratories & Geum-Taek Jin, Korea Power Engineering Company Inc.
Object Type:
Report
System:
The UNT Digital Library
IMPERMEABLE THIN Al2O3 OVERLAY FOR TBC PROTECTION FROM SULFATE AND VANADATE ATTACK IN GAS TURBINES
In order to improve the hot corrosion resistance of conventional YSZ TBC system, the Al{sub 2}O{sub 3} overlay coating has been successfully produced on the surface of YSZ by the Sol-gel route. The YSZ substrates were coated with boehmite sol by dip coating process, dried to form a gel film and calcined at 1200 C to form {alpha}-Al{sub 2}O{sub 3} overlay. The microstructures of TBC and Al{sub 2}O{sub 3} overlay were examined by scanning electron microscopy (SEM). The results showed that micro-pores ranged from 3 {micro}m to 20 {micro}m and micro-cracks could be clearly seen on the surface of APS YSZ coating. The thickness of alumina overlay increased with increasing the number of dip coating circles. The small microcracks (0.5-1.0 {micro}m width) on the YSZ surface could be filled and blocked by calcined alumina particles, whereas large pores remained empty and the alumina overlay was un-continuous after one time dip coating circle. Alumina overlay thicker than 5 m m obtained by five times dip coating circles largely cracked after calcinations. As a result, multiple dip coatings up to three times were ideal for getting high quality, crack- free and continuous overlay. The optimal thickness of alumina overlay was in the …
Date:
November 30, 2002
Creator:
Mao, Scott X.
Object Type:
Report
System:
The UNT Digital Library
Die Materials for Critical Applications and Increased Production Rates
Die materials for aluminum die-casting need to be resistant to heat checking, and have good resistance to washout and to soldering in a fast flow of molten aluminum. To resist heat checking, die materials should have a low coefficient of thermal expansion, high thermal conductivity, high hot yield strength, good temper softening resistance, high creep strength, and adequate ductility. To resist the washout and soldering, die materials should have high hot hardness, good temper resistance, low solubility in molten aluminum and good oxidation resistance. It is difficult for one material to satisfy with all above requirements. In practice, H13 steel is the most popular material for aluminum die casting dies. While it is not an ideal choice, it is substantially less expensive to use than alternative materials. However, in very demanding applications, it is sometimes necessary to use alternative materials to ensure a reasonable die life. Copper-base, nickel-base alloys and superalloys, titanium-,molybdenum-, tungsten-base alloys, and to some extent yttrium and niobium alloys, have all been considered as potential materials for demanding die casting applications. Most of these alloys exhibit superior thermal fatigue resistance, but suffer from other shortcomings.
Date:
November 30, 2002
Creator:
Schwam, David; Wallace, John & Birceanu, Sebastian
Object Type:
Report
System:
The UNT Digital Library
Modeling and Simulation of Microelectrode-Retina Interactions
The goal of the retinal prosthesis project is the development of an implantable microelectrode array that can be used to supply visually-driven electrical input to cells in the retina, bypassing nonfunctional rod and cone cells, thereby restoring vision to blind individuals. This goal will be achieved through the study of the fundamentals of electrical engineering, vision research, and biomedical engineering with the aim of acquiring the knowledge needed to engineer a high-density microelectrode-tissue hybrid sensor that will restore vision to millions of blind persons. The modeling and simulation task within this project is intended to address the question how best to stimulate, and communicate with, cells in the retina using implanted microelectrodes.
Date:
November 30, 2002
Creator:
Beckerman, M
Object Type:
Report
System:
The UNT Digital Library
Multi-teraflops spin dynamics studies of the magnetic structure of FeMn/Co interfaces
The authors have used the power of massively parallel computers to perform first principles spin dynamics (SD) simulations of the magnetic structure of Iron-Manganese/Cobalt (FeMn/Co) interfaces. These large scale quantum mechanical simulations, involving 2016-atom super-cell models, reveal details of the orientational configuration of the magnetic moments at the interface that are unobtainable by any other means. Exchange bias, which involves the use of an antiferromagnetic (AFM) layer such as FeMn to pin the orientation of the magnetic moment of a proximate ferromagnetic (FM) layer such as Co, is of fundamental importance in magnetic multilayer storage and read head devices. Here the equation of motion of first principles SD is used to perform relaxations of model magnetic structures to the true ground (equilibrium) state. Our code is intrinsically parallel and has achieved a maximum execution rate of 2.46 Teraflops on the IBM SP at the National Energy Research Scientific Computing Center (NERSC).
Date:
November 30, 2002
Creator:
Canning, Andrew; Ujfalussy, B.; Schulthess, T.C.; Zhang, X.-G.; Shelton, W.A.; Nicholson, D.M.C. et al.
Object Type:
Article
System:
The UNT Digital Library
Powder River Basin Coalbed Methane Development and Produced Water Management Study
Coalbed methane resources throughout the entire Powder River Basin were reviewed in this analysis. The study was conducted at the township level, and as with all assessments conducted at such a broad level, readers must recognize and understand the limitations and appropriate use of the results. Raw and derived data provided in this report will not generally apply to any specific location. The coal geology in the basin is complex, which makes correlation with individual seams difficult at times. Although more than 12,000 wells have been drilled to date, large areas of the Powder River Basin remain relatively undeveloped. The lack of data obviously introduces uncertainty and increases variability. Proxies and analogs were used in the analysis out of necessity, though these were always based on sound reasoning. Future development in the basin will make new data and interpretations available, which will lead to a more complete description of the coals and their fluid flow properties, and refined estimates of natural gas and water production rates and cumulative recoveries. Throughout the course of the study, critical data assumptions and relationships regarding gas content, methane adsorption isotherms, and reservoir pressure were the topics of much discussion with reviewers. A summary of …
Date:
November 30, 2002
Creator:
International, Advanced Resources
Object Type:
Report
System:
The UNT Digital Library
Review of the Technical Basis of the Hydrogen Control Limit for Operations in Hanford Tank Farms
The waste in Hanford tanks generates a mixture of flammable gases and releases it into the tank headspace. The potential hazard resulting from flammable gas generation requires that controls be established to prevent ignition and halt operations if gas concentrations reach levels of concern. In cases where only hydrogen is monitored, a control limit of 6,250 ppm hydrogen has been in use at Hanford for several years. The hydrogen-based control limit is intended to conservatively represent 25% of the lower flammability limit of a gas mixture, accounting for the presence of flammable gases other than hydrogen, with ammonia being the primary concern. This report reviews the technical basis of the current control limit based on observed and projected concentrations of hydrogen and ammonia representing a range of gas release scenarios. The conclusion supports the continued use of the current 6,250 ppm hydrogen control limit
Date:
November 30, 2002
Creator:
Mahoney, Lenna A. & Stewart, Charles W.
Object Type:
Report
System:
The UNT Digital Library
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Shannon Springs Park
Photograph of a holiday scene in Shannon Springs Park.
Date:
November 30, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History