Resource Type

417 Matching Results

Results open in a new window/tab.

Suits Against Terrorist States (open access)

Suits Against Terrorist States

None
Date: January 25, 2002
Creator: Ackerman, David M.
System: The UNT Digital Library
Fundamental Studies of Recombinant Hydrogenases (open access)

Fundamental Studies of Recombinant Hydrogenases

This research addressed the long term goals of understanding the assembly and organization of hydrogenase enzymes, of reducing them in size and complexity, of determining structure/function relationships, including energy conservation via charge separation across membranes, and in screening for novel H2 catalysts. A key overall goal of the proposed research was to define and characterize minimal hydrogenases that are produced in high yields and are oxygen-resistant. Remarkably, in spite of decades of research carried out on hydrogenases, it is not possible to readily manipulate or design the enzyme using molecular biology approaches since a recombinant form produced in a suitable host is not available. Such resources are essential if we are to understand what constitutes a “minimal” hydrogenase and design such catalysts with certain properties, such as resistance to oxygen, extreme stability and specificity for a given electron donor. The model system for our studies is Pyrococcus furiosus, a hyperthermophile that grows optimally at 100°C, which contains three different nickel-iron [NiFe-] containing hydrogenases. Hydrogenases I and II are cytoplasmic while the other, MBH, is an integral membrane protein that functions to both evolve H2 and pump protons. Three important breakthroughs were made during the funding period with P. furiosus soluble …
Date: January 25, 2014
Creator: Adams, Michael W
System: The UNT Digital Library
CENRTC Project {number_sign}2F3EOA, OCB A-376, acceptance test procedure (open access)

CENRTC Project {number_sign}2F3EOA, OCB A-376, acceptance test procedure

This test procedure provides the steps necessary to verify correct functional operation of controls, annunciators, alarms, protective relays and related systems impacted by CENRTC {number_sign}2F3E0A, Microwave Transfer Trip Project, modification work performed under work package 6B-93-00041/M. This procedure separates three tests into separate sections: energization of A-376 duplex panel and circuits; SCADA tests; and A-376 local trip tests.
Date: January 25, 1995
Creator: Akerson, A. W.
System: The UNT Digital Library
Novel reactor configuration for synthesis gas conversion to alcohols (open access)

Novel reactor configuration for synthesis gas conversion to alcohols

Our objectives during this quarter was to complete studies on the kinetics of methanol synthesis reaction in the slurry reactor with long periods of on stream studies, start experimentation in the trickle bed reactor assembly, investigate simulation studies using the piston-exchange (PE) and piston-dispersion-exchange (PDE) models, and introduce water gas shift reaction as the second reaction in our simulation studies.
Date: January 25, 1992
Creator: Akgerman, A. & Anthony, R. G.
System: The UNT Digital Library
Novel reactor configuration for synthesis gas conversion to alcohols. Quarterly report, October 1, 1991--December 31, 1991 (open access)

Novel reactor configuration for synthesis gas conversion to alcohols. Quarterly report, October 1, 1991--December 31, 1991

Our objectives during this quarter was to complete studies on the kinetics of methanol synthesis reaction in the slurry reactor with long periods of on stream studies, start experimentation in the trickle bed reactor assembly, investigate simulation studies using the piston-exchange (PE) and piston-dispersion-exchange (PDE) models, and introduce water gas shift reaction as the second reaction in our simulation studies.
Date: January 25, 1992
Creator: Akgerman, A. & Anthony, R. G.
System: The UNT Digital Library
Embodied Energy and Off-Grid Lighting (open access)

Embodied Energy and Off-Grid Lighting

The greenhouse gas (GHG) emissions from fuel-based lighting are substantial given the paltry levels of lighting service provided to users, leading to a great opportunity for GHG mitigation byencouraging the switch from fuel-based to rechargeable LED lighting. However, as with most new energy technology, switching to efficient lighting requires an up-front investment of energy(and GHGs) embedded in the manufacture of replacement components. We studied a population of off-grid lighting users in 2008-2009 in Kenya who were given the opportunity to adopt LEDlighting. Based on their use patterns with the LED lights and the levels of kerosene offset we observed, we found that the embodied energy of the LED lamp was"paid for" in only one month for grid charged products and two months for solar charged products. Furthermore, the energyreturn-on investment-ratio (energy produced or offset over the product's service life divided by energy embedded) for off-grid LED lighting ranges from 12 to 24, which is on par with on-gridsolar and large-scale wind energy. We also found that the energy embodied in the manufacture of a typical hurricane lantern is about one-half to one-sixth of that embodied in the particular LEDlights that we evaluated, indicating that the energy payback time would be …
Date: January 25, 2011
Creator: Alstone, Peter; Mills, Evan & Jacobson, Arne
System: The UNT Digital Library
Bench scale testing of micronized magnetite beneficiation. Quarterly technical progress report 4, October--December, 1993 (open access)

Bench scale testing of micronized magnetite beneficiation. Quarterly technical progress report 4, October--December, 1993

This project is aimed at development of a process that, by using ultra fine magnetite suspension, would expand the application of heavy media separation technology to processing fine, {minus}28 mesh coals. These coal fines, produced during coal mining and crushing, are separated in the conventional coal preparation plant and generally impounded in a tailings pond. Development of an economic process for processing these fines into marketable product will expand the utilization of coal for power production in an environmentally acceptable and economically viable way. This process has been successfully researched at PETC but has not been studied on a continuous bench-scale unit, which is a necessary step towards commercial development of this promising technology. The goal of the program is to investigate the technology in a continuous circuit at a reasonable scale to provide a design basis for larger plants and a commercial feasibility data.
Date: January 25, 1994
Creator: Anast, K.
System: The UNT Digital Library
Review of The SIAM 100-Digit Challenge: A Study in High-Accuracy Numerical Computing (open access)

Review of The SIAM 100-Digit Challenge: A Study in High-Accuracy Numerical Computing

In the January 2002 edition of SIAM News, Nick Trefethen announced the '$100, 100-Digit Challenge'. In this note he presented ten easy-to-state but hard-to-solve problems of numerical analysis, and challenged readers to find each answer to ten-digit accuracy. Trefethen closed with the enticing comment: 'Hint: They're hard! If anyone gets 50 digits in total, I will be impressed.' This challenge obviously struck a chord in hundreds of numerical mathematicians worldwide, as 94 teams from 25 nations later submitted entries. Many of these submissions exceeded the target of 50 correct digits; in fact, 20 teams achieved a perfect score of 100 correct digits. Trefethen had offered $100 for the best submission. Given the overwhelming response, a generous donor (William Browning, founder of Applied Mathematics, Inc.) provided additional funds to provide a $100 award to each of the 20 winning teams. Soon after the results were out, four participants, each from a winning team, got together and agreed to write a book about the problems and their solutions. The team is truly international: Bornemann is from Germany, Laurie is from South Africa, Wagon is from the USA, and Waldvogel is from Switzerland. This book provides some mathematical background for each problem, and …
Date: January 25, 2005
Creator: Bailey, David
System: The UNT Digital Library
Practical superconductor development for electrical power applications - annual report for FY 2000. (open access)

Practical superconductor development for electrical power applications - annual report for FY 2000.

Most large-scale high-critical-temperature superconductor applications require wires or tapes that an carry high currents in applied magnetic fields. This report describes technical progress of research and development efforts aimed at producing superconducting components and devices in the Y-Ba-Cu-O and Bi-(Pb)-Sr-Ca-Cu-O systems. Topics discussed are formation of first- and second-generation composite conductors, characterization of structures and superconducting and mechanical properties, modeling of grain-boundary current transport, and fabrication and analysis of prototype components.
Date: January 25, 2001
Creator: Balachandran, U.; Cha, Y. S.; Dorris, S. E.; Dusek, J. T.; Emerson, J. E.; Fisher, B. L. et al.
System: The UNT Digital Library
Advanced microinstrumentation for rapid DNA sequencing and large DNA fragment separation (open access)

Advanced microinstrumentation for rapid DNA sequencing and large DNA fragment separation

Our efforts to develop novel technology for a rapid DNA sequencer and large fragment analysis system based upon gel electrophoresis are described. We are using microfabrication technology to build dense arrays of high speed micro electrophoresis lanes that will ultimately increase the sequencing rate of DNA by at least 100 times the rate of current sequencers. We have demonstrated high resolution DNA fragment separation needed for sequencing in polyacrylamide microgels formed in glass microchannels. We have built prototype arrays of microchannels having up to 48 channels. Significant progress has also been made in developing a sensitive fluorescence detection system based upon a confocal microscope design that will enable the diagnostics and detection of DNA fragments in ultrathin microchannel gels. Development of a rapid DNA sequencer and fragment analysis system will have a major impact on future DNA instrumentation used in clinical, molecular and forensic analysis of DNA fragments.
Date: January 25, 1995
Creator: Balch, J.; Davidson, J.; Brewer, L.; Gingrich, J.; Koo, J.; Mariella, R. et al.
System: The UNT Digital Library
PNNL OS3300 Alpha/Beta Monitoring System Software and Hardware Operations Manual, Revision 0 (open access)

PNNL OS3300 Alpha/Beta Monitoring System Software and Hardware Operations Manual, Revision 0

This Pacific Northwest National Laboratory (PNNL) OS3300 Alpha/Beta Monitoring System Software and Hardware Operations Manual describes how to install and operate the software and hardware on a personal computer in conjunction with the EG&G Berthold LB150D continuous air monitor. Included are operational details for the software functions, how to read and use the drop-down menus, how to understand readings and calculations, and how to access the database tables.
Date: January 25, 2006
Creator: Barnett, J. M.; Duchsherer, Cheryl J.; Sisk, Daniel R.; Carter, Gregory L.; Douglas, David D. & Carrell, Dorothy M.
System: The UNT Digital Library
Applications of advanced petroleum production technology and water alternating gas injection for enhanced oil recovery: Mattoon Oil Field, Illinois. Fourth quarterly report, [October 1, 1993--December 31, 1993] (open access)

Applications of advanced petroleum production technology and water alternating gas injection for enhanced oil recovery: Mattoon Oil Field, Illinois. Fourth quarterly report, [October 1, 1993--December 31, 1993]

The objectives of this project are to continue reservoir characterization of the Cypress Sandstone; to identify and map fades-defined waterflood units (FDWS); and to design and Implement water-alternating-gas (WAG) oil recovery utilizing carbon dioxide (CO{sub 2}). The producibility problems are permeability variation and poor sweep efficiency. Phase 1 of the project focuses on the development of computer-generated geological and reservoir simulation models that will be used to select sites for the demonstration and implementation of CO{sub 2} displacement programs in Phase 2. Included in Phase 1 is the site selection and drilling of an infill well, coring of the Cypress interval, and injectivity testing to gather information used to update the reservoir simulation model. Phase 2 involves field implementation of WAG. Technology Transfer includes outreach activity such as seminars, workshops, and field trips. Technical progress for this quarter is described.
Date: January 25, 1994
Creator: Baroni, M.
System: The UNT Digital Library
Investigation of Stresses Due to Thermal Gradients in Typical Aircraft Structures (open access)

Investigation of Stresses Due to Thermal Gradients in Typical Aircraft Structures

Memorandum presenting an investigation of a series of five 75S-T6 aluminum-alloy elementary skin and spar-cap combinations with skin varying from 0.051 to 0.500 inch in thickness to determine the temperature and stress gradients resulting from the application of heat to the surface. The data are presented in the form of tables of the measured temperatures and stresses calculated from the measured strains.
Date: January 25, 1952
Creator: Barzelay, Martin E. & Boison, James C.
System: The UNT Digital Library
The Path of Carbon in Photosynthesis VIII. The Role of MalicAcid (open access)

The Path of Carbon in Photosynthesis VIII. The Role of MalicAcid

Malonate has been found to inhibit the formation of malic acid during short periods of photosynthesis with radioactive carbon dioxide. This result, together with studies which show the photosynthetic cycle to be operating normally at the same time, indicates that malic acid is not an intermediate in photosynthesis but is probably closely related to some intermediate of the cycle. Absence of labeled succinic and fumaric acids in these experiments, in addition to the failure of malonate to inhibit photosynthesis, precludes the participation of these acids as intermediates in photosynthesis.
Date: January 25, 1950
Creator: Bassham, James A.; Benson, Andrew A. & Calvin, Melvin
System: The UNT Digital Library
Government Access to Phone Calling Activity and Related Records: Legal Authorities (open access)

Government Access to Phone Calling Activity and Related Records: Legal Authorities

This report summarizes statutory authorities regarding access by the government, for wither foreign intelligence or law enforcement purposes, to information related to telephone calling patterns or practices. Where pertinent, it also discusses statutory prohibitions against accessing or disclosing such information, along with relevant exceptions to those prohibitions.
Date: January 25, 2007
Creator: Bazan, Elizabeth B.; Stevens, Gina Marie & Yeh, Brian T.
System: The UNT Digital Library
Emergency Management Preparedness Standards: Overview and Options for Congress (open access)

Emergency Management Preparedness Standards: Overview and Options for Congress

This report presents background information on the commission's findings, on emergency response standards, and on options Congress might consider to address issues related to emergency preparedness standards.
Date: January 25, 2006
Creator: Bea, Keith
System: The UNT Digital Library
QED and electron collisions in the super strong fields of K-shell actinide ions (open access)

QED and electron collisions in the super strong fields of K-shell actinide ions

Atomic physics of high-Z, heavy ions is very different from that encountered in low-Z or medium-Z ions. The reason is the ultra strong nuclear field found only in the heaviest ions. The highest-Z atomic systems available to physical investigation, the actinides, therefore, offer rich new physics that cannot be studied any other way. This ranges from new dominating forces in electron-ion collisions to tests of fundamental theories. A measurement of the two-loop Lamb shift in uranium is by many considered to be the ''holy grail'' of high-field QED tests of atomic systems. Such measurements have been attempted at heavy-ion accelerator facilities but have yet to succeed because of the difficulty to make measurements with the required accuracy. Also, electron collisions behave very differently in such tightly bound systems. The magnetic interaction between the ion and the incoming free electron (the so-called generalized Breit interaction) is essentially non-existent in collisions involving low and medium-Z ions. This interaction is therefore missing in essentially all electron collision codes. But in heavy, highly charged ions like uranium, the generalized Breit interaction readily is the dominant force, changing electron collision cross sections by a factor of two. This has never been experimentally observed. In fact, …
Date: January 25, 2006
Creator: Beiersdorfer, P.
System: The UNT Digital Library
Standard hydrogen monitoring system-B operation and maintenance manual (open access)

Standard hydrogen monitoring system-B operation and maintenance manual

The purpose of this document is to provide information for the operation and maintenance of the Standards Hydrogen Monitoring System-B (SHMS-B) used in the 200E and 200W area tank farms on the Hanford site. This provides information specific to the mechanical operation of the system and is not intended to take the place of a Plant Operating Procedure. The primary function of the SHMS-B is to monitor specifically for hydrogen in the waste tank vapor space which may also contain unknown quantities of other gaseous constituents.
Date: January 25, 1995
Creator: Bender, R.M.
System: The UNT Digital Library
Intelligence Issues for Congress (open access)

Intelligence Issues for Congress

This report discusses legislative initiatives to address the challenges facing the U.S. Intelligence Community in the 21st century.
Date: January 25, 2007
Creator: Best, Richard A., Jr.
System: The UNT Digital Library
Consolidation of Zircaloy-4 End Crops by Induction Melting (open access)

Consolidation of Zircaloy-4 End Crops by Induction Melting

The Oak Ridge Y-12 Plant is investigating the use of induction melting as a method of consolidating Zircaloy-4, a zirconium alloy used in the fabrication of submarine nuclear reactor cores. Knolls Atomic Power Laboratory (KAPL) furnished about 4000 lb of typical core material, also known as hardware, for use in evaluating induction melting as a method of consolidation. Three ingots were produced by the induction melting of hardware in a graphite crucible that was protected by a laminated coating specifically developed for this application. This report includes a description of both the equipment and the crucible coating materials used for this project, a discussion of results, and a production assessment of using this technique for full-scale consolidation.
Date: January 25, 1994
Creator: Bird, E. L.
System: The UNT Digital Library
NORTH PORTAL - DOMESTIC COLD WATER CALCULATION - CHANGE HOUSE FACILITY #5008 (open access)

NORTH PORTAL - DOMESTIC COLD WATER CALCULATION - CHANGE HOUSE FACILITY #5008

The purpose of this design analysis and calculation is to determine the demand for domestic cold water and to size the supply main piping for the Change House Facility No.5008 in accordance with the Uniform Plumbing Code (Section 4.4.1) and U.S. Department of Energy Order 6430.1A-1540 (Section 4.4.2). The method used for the calculations is based on the Uniform Plumbing Code (UPC), Section 4.4.1. The first step is to determine the maximum pressure drop between the most remote cold water plumbing fixture and the main distribution supply. The developed length of pipe from the supply to the fixture is then determined from the plumbing drawings. The maximum pressure drop is then divided by the developed length which results in the friction loss per 100 feet of pipe. Equivalent fixture units are assigned from the UPC based on the actual fixture count which when totaled determines the water flow rate. The water flow rate and pressure drop are used to determine the pipe size based on a given velocity of flow.
Date: January 25, 1996
Creator: Blackstone, R.
System: The UNT Digital Library
NORTH PORTAL - HOT WATER CALCULATION - CHANGE HOUSE FACILITY #5008 (open access)

NORTH PORTAL - HOT WATER CALCULATION - CHANGE HOUSE FACILITY #5008

The purpose of this design analysis and calculation is to determine the demand for hot water and to size the supply main piping for the Change House Facility No.5008 in accordance with the Uniform Plumbing Code (UPC) (Section 4.4.1) and U.S. Department of Energy Order 6430.1A-1540. The method used for the calculations is based on Section 4.4.1. The first step is to determine the maximum pressure drop between the most remote plumbing fixture and the main supply. The pressure drop for the hot water system is based on the total length of the supply piping from the cold water supply source through the water heater to the most remote hot water outlet. Equivalent fixture units are then assigned using Section 4.4.1. For hot water, the values are reduced by 25 percent in accordance with the UPC. The demand load in gpm is then determined based on the number of fixture units. The demand load and the pressure drop between the source and the most remote fixture is used to determine the pipe size and the corresponding friction losses for a given flow velocity not to exceed 10 feet/second.
Date: January 25, 1996
Creator: Blackstone, R.
System: The UNT Digital Library
NORTH PORTAL-HOT WATER CALCULATION-SHOP BUILDING #5006 (open access)

NORTH PORTAL-HOT WATER CALCULATION-SHOP BUILDING #5006

The purpose of this design analysis and calculation is to determine the demand for domestic cold water and to size the supply main for the Shop Building No.5006 in accordance with the Uniform Plumbing Code (UPC) (Section 4.4.1) and the U.S. Department of Energy, Order 6430.1A-1540 (Section 4.4.2).
Date: January 25, 2006
Creator: Blackstone, R.
System: The UNT Digital Library