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Monte Carlo simulations of phosphate polyhedron connectivity in glasses
Monte Carlo simulations of phosphate tetrahedron connectivity distributions in alkali and alkaline earth phosphate glasses are reported. By utilizing a discrete bond model, the distribution of next-nearest neighbor connectivities between phosphate polyhedron for random, alternating and clustering bonding scenarios was evaluated as a function of the relative bond energy difference. The simulated distributions are compared to experimentally observed connectivities reported for solid-state two-dimensional exchange and double-quantum NMR experiments of phosphate glasses. These Monte Carlo simulations demonstrate that the polyhedron connectivity is best described by a random distribution in lithium phosphate and calcium phosphate glasses.
Date:
January 1, 2000
Creator:
ALAM,TODD M.
Object Type:
Report
System:
The UNT Digital Library
Acceptance Test Report for the 241-AZ-101 Ultrasonic Interface Level Analyzer
This document comprises the Acceptance Test Report for the 241-AZ-101 Ultrasonic Interface Level Analyzer. This document presents the results of Acceptance Testing of the 241-AZ-101 Ultrasonic Interface Level Analyzers (URSILLAs). Testing of the URSILLAs was performed in accordance with ATP-260-001, ''URSILLA Pre-installation Acceptance Test Procedure''. The objective of the testing was to verify that all equipment and components function in accordance with design specifications and original equipment manufacturer's specifications.
Date:
January 27, 2000
Creator:
ANDREWS, J.E.
Object Type:
Report
System:
The UNT Digital Library
ADVANCED SORBENT DEVELOPMENT
The overall objective of this program was to develop regenerable sorbents for use in the temperature range of 343 to 538 C (650 to 1000 F) to remove hydrogen sulfide (H{sub 2}S) from coal-derived fuel gases in a fluidized-bed reactor. The goal was to develop sorbents that are capable of reducing the H{sub 2}S level in the fuel gas to less than 20 ppmv in the specified temperature range and pressures in the range of 1 to 20 atmospheres, with chemical characteristics that permit cyclic regeneration over many cycles without a drastic loss of activity, as well as physical, characteristics that are compatible with the fluidized bed application. This topical report focuses on the investigation directed toward preparation of zinc-based sorbents using the sol-gel approach that has been shown to require only a moderate temperature for calcination, while resulting in significantly more attrition-resistant sorbents. The sorbents prepared in this part of the investigation and the results from their evaluation in packed-bed and fluidized-bed reactors are described in this report.
Date:
January 1, 2000
Creator:
Abbasian, Javad
Object Type:
Report
System:
The UNT Digital Library
Reductive Precipitation of Metals Photosensitized by Tin Protoporphyrin
For the first time, we show that redox-sensitive metals, which are highly soluble in the oxidized state can be reduced and precipitated from aqueous solution using tin protoporphyrin and light in the presence of an electron donor. Hg{sup 2+} and Cu{sup 2+} were reduced to the metallic state, and Ub{sup 6+} precipitated as oxide with very low volubility, suggesting that removal of these metals via reductive photoreduction and precipitation may be an innovative way for wastewater treatment. Ag{sup 2+} and Au{sup 2+} were reduced to the metallic state and precipitated as nanoparticles. Finally, using tin porphyrins and light for a variety of purposes involving reactions that require a low redox potential may be a good step toward energy conservation and environmentally benign processing.
Date:
January 18, 2000
Creator:
Abdelouas, A.; Gong, W. L. & Shelnutt, John A.
Object Type:
Article
System:
The UNT Digital Library
Reduction of Heavy Metals by Cytochrome c(3)
We report on reduction and precipitation of Se(VI), Pb(II), CU(II), U(VI), Mo(VI), and Cr(VI) in water by cytochrome c{sub 3} isolated from Desulfomicrobium baczdatum [strain 9974]. The tetraheme protein cytochrome c{sub 3} was reduced by sodium dithionite. Redox reactions were monitored by UV-visible spectroscopy of cytochrome c{sub 3}. Analytical electron microscopy work showed that Se(VI), Pb(II), and CU(II) were reduced to the metallic state, U(W) and Mo(W) to U(IV) and Mo(IV), respectively, and Cr(VI) probably to Cr(III). U(IV) and Mo(W) precipitated as oxides and Cr(III) as an amorphous hydroxide. Cytochrome c{sub 3} was used repeatedly in the same solution without loosing its effectiveness. The results suggest usage of cytochrome c{sub 3} to develop innovative and environmentally benign methods to remove heavy metals from waste- and groundwater.
Date:
January 18, 2000
Creator:
Abdelouas, A.; Gong, W. L.; Lutze, W.; Nuttall, E. H.; Sprague, F.; Shelnutt, John A. et al.
Object Type:
Article
System:
The UNT Digital Library
State-by-State Comparison of Selected Electricity Restructuring Provisions
Since 1996, twenty-one states have restructured their electricity markets. While the extent of this restructuring varies by state, four issues have generally been considered by all state legislatures: stranded costs, aggregation, universal service, and public benefits. This report compares the treatment of these issues in the restructuring legislation of the twenty-one states. Using information collected directly from the relevant state laws and the rules promulgated by state public utility commissions, this report provides a state-by-state comparison of the restructuring provisions relating to the four issues.
Date:
January 13, 2000
Creator:
Abel, Amy & Shimabukuro, Jon O.
Object Type:
Report
System:
The UNT Digital Library
[Abilene City Council Minutes: 2000]
Ledger containing minutes of the City Council in Abilene, Texas documenting the group's discussions and activities from January 13, 2000 to December 21, 2000.
Date:
2000-01-13/2000-12-21
Creator:
Abilene (Tex.)
Object Type:
Book
System:
The Portal to Texas History
Tribological performance of NFC coatings under oil lubrication[Near Frictionless Carbon]
An increase in engine and vehicle efficiency usually requires an increase in the severity of contact at the interfaces of many critical components. Examples of such components include piston rings and cylinder liners in the engine, gears in the transmission and axle, bearings, etc. These components are oil-lubricated and require enhancement of their tribological performance. Argonne National Laboratory (ANL) recently developed a carbon-based coating with very low friction and wear properties. These near-frictionless-carbon (NFC) coatings have potential for application in various engine components for performance enhancement. This paper presents the study of the tribological performance of NFC-coated steel surfaces when lubricated with fully formulated and basestock synthetic oils. The NFC coatings reduced both the friction and wear of lubricated steel surfaces. The effect of the coating was much more pronounced in tests with basestock oil. This suggests that NFC-coated parts may not require heavily formulated lubricant oils to perform satisfactorily in terms of reliability and durability.
Date:
January 20, 2000
Creator:
Ajayi, O. O.; Alzoubi, M.; Erdemir, A.; Fenske, G. R.; Eryilmaz, O. L. & Zimmerman, S.
Object Type:
Article
System:
The UNT Digital Library
Low-friction coatings for air bearings in fuel cell air compressors
In an effort to reduce fuel consumption and emissions, hybrid vehicles incorporating fuel cell systems are being developed by automotive manufacturers, their suppliers, federal agencies (specifically, the US Department of Energy) and national laboratories. The fuel cell system will require an air management subsystem that includes a compressor/expander. Certain components in the compressor will require innovative lubrication technology in order to reduce parasitic energy losses and improve their reliability and durability. One such component is the air bearing for air turbocompressors designed and fabricated by Meruit, Inc. Argonne National Laboratory recently developed a carbon-based coating with low friction and wear attributes; this near-frictionless-carbon (NFC) coating is a potential candidate for use in turbocompressor air bearings. The authors present here an evaluation of the Argonne coating for air compressor thrust bearings. With two parallel 440C stainless steel discs in unidirectional sliding contact, the NFC reduced the frictional force four times and the wear rate by more than two orders of magnitude. Wear mechanism on the uncoated surface involved oxidation and production of iron oxide debris. Wear occurred on the coated surfaces primarily by a polishing mechanism.
Date:
January 6, 2000
Creator:
Ajayi, O. O.; Fenske, G. R.; Erdemir, A.; Woodford, J.; Sitts, J.; Elshot, K. et al.
Object Type:
Article
System:
The UNT Digital Library
PULSATING MIXER PUMP SYSTEM
None
Date:
January 13, 2000
Creator:
Albert, Thomas E.
Object Type:
Article
System:
The UNT Digital Library
Processing Effects on Junction Interdiffusion in CdS/CdTe Polycrystalline Devices
The performance of CdS/CdTe solar cells is strongly impacted by the process used to grow the CdS layer. CdS films grown by chemical-bath deposition (CBD) exhibit lower sublimation (CSS).
Date:
January 1, 2000
Creator:
Albin, D.; Yan, Y.; King, D.; Moutinho, H.; Jones, K.; Matson, R. et al.
Object Type:
Article
System:
The UNT Digital Library
MACHO project 9 million star color-magnitude diagram of the large magellanic cloud
The authors present a 9 million star color-magnitude diagram (9M CMD) of the Large Magellanic Cloud (LMC) bar. The 9M CMD reveals a complex superposition of different age and metallicity stellar populations, with important stellar evolutionary phases occurring over three orders of magnitude in number density. First, they count the non-variable red and blue supergiants, the associated Cepheid variables, and measure the stellar effective temperatures defining the Cepheid instability strip. Lifetime predictions of stellar evolution theory are tested, with implications for the origin of low-luminosity Cepheids. The highly-evolved asymptotic giant branch (AGB) stars in the 9M CMD have a bimodal distribution in brightness, which they interpret as discrete old populations ({ge} 1 Gyr). The faint AGB sequence may be metal-poor and very old. Comparing the mean properties of giant branch and horizontal branch (HB) stars in the 9M CMD to those of clusters, they identify NGC 411 and M3 as templates for the admixture of old stellar populations in the bar. However, there are several indications that the old and metal-poor field population has a red HB morphology: the RR Lyrae variables lie preferentially on the red edge of the instability strip, the AGB-bump is very red, and the ratio …
Date:
January 31, 2000
Creator:
Alcock, C.; Allsman, R. A.; Alves, D. R.; Axelrod, T. S.; Basu, A.; Becker, A. C. et al.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Mansfield Millington Bascom, January 29, 2000
Access:
Use of this item is restricted to the UNT Community
Interview with engineer and Army veteran Mansfield Millington Bascom. The interview includes Bascom's personal experiences about the European Theater during World War II, basic training, action on the Siegfried Line, the Battle of Aachen, individual episodes of close ground combat, German tank concentrations immediately prior to the Ardennes Offensive, being wounded and evacuating from the front, recuperation, and returning to the states.
Date:
January 29, 2000
Creator:
Alexander, William J. & Bascom, Mansfield Millington
Object Type:
Book
System:
The UNT Digital Library
Dependence of the Characteristics of Mo Films on Sputter Conditions
The residual stress, resistance, orientation, and microstructure of sputtered Mo films were studied as a function of varied-deposition power and pressure.
Date:
January 1, 2000
Creator:
Alleman, J. L.; Althani, H.; Noufi, R.; Moutinho, H.; Al-Jassim, M. M. & Hasoon, F.
Object Type:
Article
System:
The UNT Digital Library
Letter regarding the first meeting of 2000
Letter regarding the first meeting of 2000 required by all branch presidents and members.
Date:
January 12, 2000
Creator:
Allen, Richard
Object Type:
Letter
System:
The Gateway to Oklahoma History
THE NEED FOR IMAGE PROCESSING IN INFRARED CAMERA DESIGN
None
Date:
January 1, 2000
Creator:
Allred, L.G. & Jones, M.H.
Object Type:
Article
System:
The UNT Digital Library
[Newspaper Clipping About a Burning Building in Pottsboro, Texas]
Newspaper clipping from the Pottsboro Press regarding a fire that burned a three-story building complex to the ground. The article describes the fire and the firefighter response.
Date:
January 6, 2000
Creator:
Alvarez, Frank, Sr.
Object Type:
Clipping
System:
The Portal to Texas History
Tribological behavior of near-frictionless carbon coatings in high- and low-sulfur diesel fuels.
The sulfur content in diesel fuel has a significant effect on diesel engine emissions, which are currently subject to environmental regulations. It has been observed that engine particulate and gaseous emissions are directly proportional to fuel sulfur content. With the introduction of low-sulfur fuels, significant reductions in emissions are expected. The process of sulfur reduction in petroleum-based diesel fuels also reduces the lubricity of the fuel, resulting in premature failure of fuel injectors. Thus, another means of preventing injector failures is needed for engines operating with low-sulfur diesel fuels. In this study, the authors evaluated a near-frictionless carbon (NFC) coating (developed at Argonne National Laboratory) as a possible solution to the problems associated with fuel injector failures in low-lubricity fuels. Tribological tests were conducted with NFC-coated and uncoated H13 and 52100 steels lubricated with high- and low- sulfur diesel fuels in a high-frequency reciprocating test machine. The test results showed that the NFC coatings reduced wear rates by a factor of 10 over those of uncoated steel surfaces. In low-sulfur diesel fuel, the reduction in wear rate was even greater (i.e., by a factor of 12 compared to that of uncoated test pairs), indicating that the NFC coating holds promise …
Date:
January 19, 2000
Creator:
Alzoubi, M. F.; Ajayi, O. O.; Eryilmaz, O. L.; Ozturk, O.; Erdemir, A. & Fenske, G.
Object Type:
Article
System:
The UNT Digital Library
Mechanical design and analysis of the Fermilab 11 T Nb{sub 3}Sn dipole model
The goal of the Fermilab High Field Magnet (HFM) R and D project is to explore various designs and production technology of a high-field, low-cost Nb{sub 3}Sn accelerator magnet suitable for a future Very Large Hadron Collider (VLHC). The model under fabrication consists of two-layer shell-type coil with 43.5 mm aperture and cold iron yoke. Fermilab concept of magnet design and fabrication technology involves some specific features such as curing of half-coil with ceramic binder/matrix before reaction, and then simultaneous reaction and impregnation of both half-coils to get a coil pipe structure. The coil pipe is mechanically supported by the vertically-split iron yoke locked by two aluminum clamps and a thick stainless steel skin. 2D finite element analysis has been performed to study and optimize the prestress in the coil and in the structural elements at room temperature and at 4.2 K. Model description, material properties and the results of mechanical analysis are reported in this paper.
Date:
January 26, 2000
Creator:
Ambrosio, G.
Object Type:
Article
System:
The UNT Digital Library
Study of the react and wind technique for a Nb{sub 3}Sn common coil dipole
Fermilab, in collaboration with LBNL, is exploring the use of the react and wind technique for a common coil dipole with a Nb{sub 3}Sn Rutherford cable. An R and D program on conductor design and magnet technology was begun aiming at an 11 T, 2 layer, 30 mm aperture design operating at 4.5 K. The goal is to explore the feasibility of the react and wind technique for flat coils with a minimum bending radius of 90 mm. In order to improve the understanding of the I{sub c} degradation caused by bending after reaction this effect will be studied on both strands and cables. In this paper, the authors present two techniques to measure the critical current degradation due to bending, both in wires and cables, using standard test facilities. Together with the description of the program they show the results of the first measurements on strands and the layout of the cables that are being produced.
Date:
January 26, 2000
Creator:
Ambrosio, G.
Object Type:
Article
System:
The UNT Digital Library
Southwest Retort, Volume 52, Number 5, January 2000
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
January 2000
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Three-dimensional position sensing and field shaping in orthogonal-strip germanium gamma-ray detectors.
None
Date:
January 5, 2000
Creator:
Amman, M. & Luke, P. N.
Object Type:
Article
System:
The UNT Digital Library
Kalispel Resident Fish Project: Annual Report, 2000.
None
Date:
January 1, 2000
Creator:
Andersen, Todd
Object Type:
Report
System:
The UNT Digital Library
Continuum-based FEM modeling of ceramic powder compaction using a cap-plasticity constitutive model
Common ceramic component manufacturing typically involves the processing of the raw materials in powder form. Granulated powder is formed into a green body of the desired size and shape by consolidation, often by simply pressing nominally dry powder. Ceramic powders are commonly pressed in steel dies or rubber bags with the aim of producing a near-net-shape green body for subsequent sintering. Density gradients in these compacts, introduced during the pressing operation, are often severe enough to cause distortions in the shape of the part during sintering due to nonuniform shrinkage. In such cases, green machining or diamond grinding operations may be needed to obtain the desired final shape and size part. In severe cases, nonuniform shrinkage may even cause fracture in the parts during sintering. Likewise, density gradients can result in green bodies that break during ejection from the die or that are too fragile to be handled during subsequent processing. Empirical relationships currently exist to describe powder compaction but provide little understanding of how to control die design or compaction parameters to minimize density gradients thereby forcing the designer to use expensive and time consuming trial and error procedures. For this reason, interest has grown in developing computational tools …
Date:
January 25, 2000
Creator:
Arguello, Jose G., Jr.; Fossum, Arlo F.; Zeuch, David H. & Ewsuk, Kevin G.
Object Type:
Article
System:
The UNT Digital Library