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[Press Release: 7 Major Demands of the 1993 March Finalized] (open access)

[Press Release: 7 Major Demands of the 1993 March Finalized]

A press release discussing, planning, and announcing the details of the 1993 March on Washington in protest of the discrimination that the LGBT community faces and the community's demands for equal rights.
Date: October 13, 1992
Creator: 1993 March on Washington Organizers
Object Type: Text
System: The UNT Digital Library
Physical effects of infrared quark eigenmodes in LQCD (open access)

Physical effects of infrared quark eigenmodes in LQCD

A truncated determinant algorithm is used to study the physical effects of the quark eigenmodes associated with eigenvalues below 300 MeV. This initial study focuses on coarse lattices (with O(a{sup 2}) improved gauge action), light internal quark masses and large physical volumes. Four bellweather full QCD processes are discussed: topological charge distributions, the eta prime propagator, string breaking as observed in the static energy and the rho decay into two pions.
Date: October 7, 1999
Creator: A. Duncan, E. Eichten and H. Thacker
Object Type: Article
System: The UNT Digital Library
Results from an FPIX0 chip bump-bonded to an atlas pixel detector (open access)

Results from an FPIX0 chip bump-bonded to an atlas pixel detector

Results are presented of tests performed on the first pixel detector readout ASIC designed at Fermilab (FPIX0).
Date: October 1, 1998
Creator: A. Mekkaoui, D. Christian, S. Kwan, J Srage and R. Yarema
Object Type: Article
System: The UNT Digital Library
Pre-conceptual Design of a Rapid Cycling Medical Synchrotron (open access)

Pre-conceptual Design of a Rapid Cycling Medical Synchrotron

N/A
Date: October 1, 1999
Creator: A., Favale; Myers, T.; Rathke, J.; Sredniawski, J.; Todd, A.; Barton, D. et al.
Object Type: Report
System: The UNT Digital Library
HYDROTHERMAL ALTERATION OF CONCRETE: YUCCA MOUNTAIN REPOSITORY ANALOGUES (open access)

HYDROTHERMAL ALTERATION OF CONCRETE: YUCCA MOUNTAIN REPOSITORY ANALOGUES

None
Date: October 1, 1997
Creator: A.MEIKE, K.B. MYERS
Object Type: Report
System: The UNT Digital Library
[Bush debate claims on AIDS record disputed] (open access)

[Bush debate claims on AIDS record disputed]

Documents from the Aids Action Council disputing George H. W. Bush claims on AIDS issues during the 1992 Presidential debate.
Date: October 13, 1992
Creator: AIDS Action Council
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
[Letter from the AIDS Equity League to supporter of the league, October 8, 1990] (open access)

[Letter from the AIDS Equity League to supporter of the league, October 8, 1990]

Letter from Eugene Harrington, Patricia Gandy, Robert Falletti, and Joel Martinez of the AIDS Equity League to a supporter who signed the league's Statement of Conscience.
Date: October 8, 1990
Creator: AIDS Equity League
Object Type: Letter
System: The UNT Digital Library
[Charts: Listing of EMAs by amount of formula FY 1995 award] (open access)

[Charts: Listing of EMAs by amount of formula FY 1995 award]

A series of charts and graphs showing the EMAs by change in formula award based of city.
Date: October 26, 1994
Creator: AIDS Service Dallas
Object Type: Text
System: The UNT Digital Library
Observations of Non-Close-Packed Arrangements in Multilayers of Passivated Gold Clusters (open access)

Observations of Non-Close-Packed Arrangements in Multilayers of Passivated Gold Clusters

The stacking of second and third layers of supercrystals of self-assembled passivated gold nanoparticles has been investigated using transmission electron microscopy. We report for the first time nanoparticles occupying the twofold saddle site in the third layer.
Date: October 5, 1999
Creator: AINDOW, M.; Brown, P.; Kiely, C. J.; Wellner, A. & Wilcoxon, Jess P.
Object Type: Article
System: The UNT Digital Library
Analysis of Tracer Tests with Multirate Diffusion Models: Recent Results and Future Directions within the WIPP Project (open access)

Analysis of Tracer Tests with Multirate Diffusion Models: Recent Results and Future Directions within the WIPP Project

A series of single-well injection-withdrawal (SWIW) and two-well convergent-flow (TWCF) tracer tests were conducted in the Culebra dolomite at the WIPP site in late 1995 and early 1996. Modeling analyses over the past year have focused on reproducing the observed mass-recovery curves and understanding the basic physical processes controlling tracer transport in SWIW and TWCF tests. To date, specific modeling efforts have focused on five SWIW tests and one TWCF pathway at each of two different locations (H-11 and H-19 hydropads). An inverse parameter-estimation procedure was implemented to model the SWIW and TWCF tests with both traditional and multirate double-porosity formulations. The traditional model assumes a single diffusion rate while the multirate model uses a first-order approximation to model a continuous distribution of diffusion coefficients. Conceptually, the multirate model represents variable matrix block sizes within the Culebra as observed in geologic investigations and also variability in diffusion rates within the matrix blocks as observed with X-ray imaging in the laboratory. Single-rate double-porosity models cannot provide an adequate match to the SWIW data. Multirate double-porosity models provide excellent fits to all five SWIW mass-recovery curves. Models of the TWCF tests show that, at one location, the tracer test can be modeled …
Date: October 1, 1999
Creator: ALTMAN, SUSAN J.; HAGGERTY, ROY; MCKENNA, SEAN A. & MEIGS, LUCY C.
Object Type: Article
System: The UNT Digital Library
Motion Planning for a Direct Metal Deposition Rapid Prototyping System (open access)

Motion Planning for a Direct Metal Deposition Rapid Prototyping System

A motion planning strategy was developed and implemented to generate motion control instructions from solid model data for controlling a robotically driven solid free-form fabrication process. The planning strategy was tested using a PUMA type robot arm integrated into a LENS{trademark} (Laser Engineered Net Shape) system. Previous systems relied on a series of x, y, and z stages, to provide a minimal coordinated motion control capability. This limited the complexity of geometries that could be constructed. With the coordinated motion provided by a robotic arm, the system can produce three dimensional parts by ''writing'' material onto any face of existing material. The motion planning strategy relied on solid model geometry evaluation and exploited robotic positioning flexibility to allow the construction of geometrically complex parts. The integration of the robotic manipulator into the LENS{trademark} system was tested by producing metal parts directly from CAD models.
Date: October 18, 1999
Creator: AMES,ARLO L.; HENSINGER,DAVID M. & KUHLMANN,JOEL L.
Object Type: Article
System: The UNT Digital Library
Evaluation of cracking in the 241-AZ tank farm ventilation line at the Hanford Site (open access)

Evaluation of cracking in the 241-AZ tank farm ventilation line at the Hanford Site

In the period from April to October of 1988, a series of welding operations on the outside of the AZ Tank Farm ventilation line piping at the Hanford Site produced unexpected and repeated cracking of the austenitic stainless steel base metal and of a seam weld in the pipe. The ventilation line is fabricated from type 304L stainless steel pipe of 24 inch diameter and 0.25 inch wall thickness. The pipe was wrapped in polyethylene bubble wrap and buried approximately 12 feet below grade. Except for the time period between 1980 and 1987, impressed current cathodic protection has been applied to the pipe since its installation in 1974. The paper describes the history of the cracking of the pipe, the probable cracking mechanisms, and the recommended future action for repair/replacement of the pipe.
Date: October 20, 1999
Creator: ANANTATMULA, R.P.
Object Type: Article
System: The UNT Digital Library
MIL-L-87177 and CLT:X-10 Lubricants Improve Electrical Connector Fretting Corrosion Behavior (open access)

MIL-L-87177 and CLT:X-10 Lubricants Improve Electrical Connector Fretting Corrosion Behavior

We have conducted a fretting research project using MIL-L-87177 and CLT: X-10 lubricants on Nano-miniature connectors. When they were fretted without lubricant, individual connectors first exceeded our 0.5 ohm failure criteria from 2,341 to 45,238 fretting cycles. With additional fretting, their contact resistance increased to more than 100,000 ohms. Unmodified MIL-L-87177 lubricant delayed the onset of first failure to between 430,000 and over 20,000,000 fretting cycles. MIL-L-87177 modified by addition of Teflon powder delayed first failure to beyond 5 million fretting cycles. Best results were obtained when Teflon was used and also when both the straight and modified lubricants were poured into and then out of the connector. CLT: X-10 lubricant delayed the onset of first failure to beyond 55 million cycles in one test where a failure was actually observed and to beyond 20 million cycles in another that was terminated without failure. CLT: X-10 recovered an unlubricated connector driven deeply into failure, with six failed pins recovering immediately and four more recovering during an additional 420 thousand fretting cycles. MIL-L-87177 was not able to recover a connector under similar conditions.
Date: October 12, 1999
Creator: AUKLAND,NEIL R. & HANLON,JAMES T.
Object Type: Article
System: The UNT Digital Library
Definition of Intrusion Scenarios and Example Concentration Ranges for the Disposal of Near-Surface Waste at the Hanford Site (open access)

Definition of Intrusion Scenarios and Example Concentration Ranges for the Disposal of Near-Surface Waste at the Hanford Site

The US Department of Energy (DOE) is in the process of conducting performance assessments of its radioactive waste sites and disposal systems to ensure that public health and safety are protected, the environment is preserved, and that no remedial actions after disposal are required. Hanford Site low-level waste performance assessments are technical evaluations of waste sites or disposal systems that provide a basis for making decisions using established criteria. The purpose of this document is to provide a family of scenarios to be considered when calculating radionuclide exposure to individuals who may inadvertently intrude into near-surface waste disposal sites. Specific performance assessments will use modifications of the general scenarios described here to include additional site/system details concerning the engineering design, waste form, inventory, and environmental setting. This document also describes and example application of the Hanford-specific scenarios in the development of example concentration ranges for the disposal of near-surface wastes. The overall goal of the example calculations is to illustrate the application of the scenarios in a performance assessment to assure that people in the future cannot receive a dose greater than an established limit. 24 refs., 2 figs., 5 tabs.
Date: October 1990
Creator: Aaberg, R. L. & Kennedy, W. E., Jr.
Object Type: Report
System: The UNT Digital Library
Application of imitation steam'' systems to hot water district heating and cooling systems (open access)

Application of imitation steam'' systems to hot water district heating and cooling systems

Pequod Associates, Inc. and District Energy St. Paul, Inc. installed a pilot project of an innovative District Heating technology through a contract with the US DOE. This applied research was funded by the Energy Research and Development Act (94--163) for District Heating and Cooling Research. The experimental design is an intervention technique that permits hot water district heating systems to connect to buildings equipped with steam heating systems to connect to buildings equipped with steam heating systems. This method can substantially reduce conversion costs in many older buildings. The method circulates Imitation Steam, which is moist hot air, as a heating medium in standard steam radiators and steam heating coils. Based on the operation of the system during the 1989--90 and 1990--91 winter heating seasons, we conclude the following: the basic concept of using Imitation Steam was proved feasible. The performance of the system can be improved beyond the levels achieved in this installation. Imitation Steam did not cause significant corrosion in the piping system. The technology can be used by other district heating systems to lower conversion costs and increase market penetration. Among the additional benefits from this technology are: eliminating old, inefficient boilers; lower maintenance costs; improved fuel …
Date: October 1, 1991
Creator: Aalto, P.J. & Chen, D.B.
Object Type: Report
System: The UNT Digital Library
Status of stable isotope enrichment, products, and services at the Oak Ridge National Laboratory (open access)

Status of stable isotope enrichment, products, and services at the Oak Ridge National Laboratory

The Oak Ridge National Laboratory (ORNL) has been supplying enriched stable and radioactive isotopes to the research, medical, and industrial communities for over 50 years. Very significant changes have occurred in this effort over the past several years, and, while many of these changes have had a negative impact on the availability of enriched isotopes, more recent developments are actually improving the situation for both the users and the producers of enriched isotopes. ORNL is still a major producer and distributor of radioisotopes, but future isotope enrichment operations conducted at the Isotope Enrichment Facility (IEF) will be limited to stable isotopes. Among the positive changes in the enriched stable isotope area are a well-functioning, long-term contract program, which offers stability and pricing advantages; the resumption of calutron operations; the adoption of prorated conversion charges, which greatly improves the pricing of isotopes to small users; SIO 9002 registration of the IEF`s quality management system; and a much more customer-oriented business philosophy. Efforts are also being made to restore and improve upon the extensive chemical and physical form processing capabilities that once existed in the enriched stable isotope program. Innovative ideas are being pursued in both technical and administrative areas to encourage …
Date: October 1, 1996
Creator: Aaron, W.S.; Tracy, J.G. & Collins, E.D.
Object Type: Article
System: The UNT Digital Library
Dissolution of low-enriched UO{sub 2}/Al dispersion plates in alkaline peroxide solution. (open access)

Dissolution of low-enriched UO{sub 2}/Al dispersion plates in alkaline peroxide solution.

Some conclusions from this report are: (1) A UO{sub 2}/Al dispersion target can be successfully dissolved in alkaline peroxide solutions; (2) after destruction of the peroxide recovery of the {sup 99}Mo would be nearly identical to existing processes using basic dissolution; (3) a low-enriched UO{sub 2}/Al dispersion targets could potentially be used for the production of {sup 99}Mo; and (4) punched cores from a UO{sub 2}/Al dispersion target will be irradiated to low-level burnup and effects of this LEU target on the recovery of {sup 99}Mo will be investigated. A commercial partner will be sought for full scale demonstrations.
Date: October 21, 1997
Creator: Aase, S.; Conner, C.; Landsberger, S.; Vandegrift, G. F.; Wu, D. & Wygmans, D. G.
Object Type: Article
System: The UNT Digital Library
Drawdown behavior of gravity drainage wells (open access)

Drawdown behavior of gravity drainage wells

An analytical solution for drawdown in gravity drainage wells is developed. The free-surface flow is viewed as incompressible, and anisotropy effects are included. The well is a line source well, and the reservoir is infinitely large. The model is valid for small drawdowns. The uniform wellbore potential inner boundary condition is modelled using the proper Green`s function. The discontinuity at the wellbore is solved by introducing a finite skin radius, and the formulation produces a seepage face. The calculated wellbore flux distribution and wellbore pressures are in fair agreement with results obtained using a numerical gravity drainage simulator. Three distinct flow periods are observed. The wellbore storage period is caused by the moving liquid level, and the duration is short. During the long intermediate flow period, the wellbore pressure is nearly constant. In this period the free surface moves downwards, and the liquid is produced mainly by vertical drainage. At long times the semilog straight line appears. The confined liquid solutions by Theis (1935) and van Everdingen and Hurst (1949) may be used during the pseudoradial flow period if the flowrate is low. New type curves are presented that yield both vertical and horizontal permeabilities.
Date: October 1, 1993
Creator: Aasen, J. A. & Ramey, H. J. Jr.
Object Type: Report
System: The UNT Digital Library
New phenomena results presented at the 1996 A.P.S. Division of Particles and Fields meeting (open access)

New phenomena results presented at the 1996 A.P.S. Division of Particles and Fields meeting

This paper is a compendium of the D0 papers submitted to the 1996 Division of Particles and Fields meeting in Minneapolis/St. Paul, Minnesota. Each paper is reproduced here in full. The papers are: (1) a search for squarks and gluinos in the dielectron channel; (2) search for excited quarks decaying to two-jets with the D0 detector; (3) search for di-jet resonances produced in association with W bosons at D0; (4) search for first generation scalar leptoquarks at D0 detector; (5) search for SUSY gaugino production through the trilepton signature; (6) search for heavy neutral gauge bosons at D0.
Date: October 1, 1996
Creator: Abachi, S.
Object Type: Article
System: The UNT Digital Library
Power as a function of reliability (open access)

Power as a function of reliability

Many studies employ multiple measurement instruments such as human raters, observers, judges, or mechanical gauges to record subject data. It is well known that the consistency of these instruments, commonly called rater reliability, limits the extent to which conclusions should be drawn from the observed data. However, the degree to which rater reliability limits conclusions has traditionally been assessed in only subjective manners. In this paper, a method is developed for objectively quantifying the impact of rate reliability on the statistical analysis of data from a commonly used collection scheme. This method allows the inclusion of a reliability index in statistical power calculations and is an invaluable tool in the planning of experiments.
Date: October 1, 1995
Creator: Abate, M.L.; McCabe, G.P. & Lynch, M.P.
Object Type: Report
System: The UNT Digital Library
Radiative higgs boson decays H {yields} f{anti f}{gamma} (open access)

Radiative higgs boson decays H {yields} f{anti f}{gamma}

Higgs boson radiative decays of the form H {r_arrow} f{ovr f}{gamma} are calculated in the Standard Model using the complete one-loop expressions for the decay amplitudes. Contributions to the radiative width from leptons and light quarks are given. We also present e{ovr e} invariant mass distributions for H {r_arrow} e{ovr e}{gamma}, which illustrate the importance of the photon pole contribution and the effects of the box diagrams. 4 refs., 6 figs.
Date: October 10, 1996
Creator: Abbasabadi, A.; Bowser-Chao, D.; Repko, W.W. & Dicus, D.A.
Object Type: Report
System: The UNT Digital Library
Stabilization and/or regeneration of spent sorbents from coal gasification. [Quarterly] technical report, March 1, 1992--May 31, 1992 (open access)

Stabilization and/or regeneration of spent sorbents from coal gasification. [Quarterly] technical report, March 1, 1992--May 31, 1992

The objective of this investigation is to determine the effects of SO{sub 2} partial pressure and reaction temperature on the conversion of sulfide containing solid wastes from coal gasifiers to stable and environmentally acceptable calcium sulfate, while preventing the release of sulfur dioxide through undesirable side reactions during the stabilization step. An additional objective of this program is to investigate the use of the Spent Sorbent Regeneration Process (SSRP) to regenerate spent limestone, from a fluidized-bed gasifier with in-bed sulfur capture, for recycling to the gasifier. To achieve these objectives, selected samples of partially sulfided sorbents will be reacted with oxygen at a variety of operating conditions under sufficient S0{sub 2} partial pressure to prevent release of sulfur from the solids during stabilization that reduces the overall sorbent utilization. Partially sulfided limestone will also be regenerated with water using the SSRP to produce calcium hydroxide and release sulfur as H{sub 2}S. The regenerated sorbent will be dewatered, dried and pelletized. The reactivity of the regenerated sorbent toward H{sub 2}S will also be determined.
Date: October 1, 1992
Creator: Abbasian, J.; Hill, A. H. & Wangerow, J. R.
Object Type: Report
System: The UNT Digital Library
Development of novel copper-based sorbents for hot-gas cleanup. Technical report, March 1, 1992--May 31, 1992 (open access)

Development of novel copper-based sorbents for hot-gas cleanup. Technical report, March 1, 1992--May 31, 1992

The objective of this investigation is to evaluate several novel copper-based binary oxides for their suitability as regenerable sorbents for hot gas cleanup application in the temperature range of 650{degrees} to 850{degrees}C. During this quarter cyclic sulfidation/regeneration tests of the sorbents Cu{sub 2}Cr-O and Cu-Ce-0 were conducted using different compositions of the feed gases to investigate the effects of H{sub 2}0, H{sub 2} and CO. These tests were conducted in a packed-bed microreactor at 850{degrees}C. The results of these tests showed that H{sub 2} and CO (along with C02) had a significant effect on the H{sub 2}S pre-breakthrough levels, whereas H{sub 2}0 did not have an effect. The physical properties of the fresh and reacted samples of the Cu-2Cr-O and Cu-Ce-0 sorbents prepared in this program and used in the cyclic sulfidation/regeneration tests were also measured. In addition, sulfidation/regeneration tests were conducted using two commercial copper chromite sorbents (G-13 and G-89, United Catalyst, Inc.) and a zinc titanate sorbent (L-3014) in a one-inch fluidized-bed reactor at 650{degrees}C. The G-13 sorbent appears to have a much higher sulfur capacity than the G-89 sorbent.
Date: October 1, 1992
Creator: Abbasian, J.; Hill, A. H.; Wangerow, J. R.; Flytzani-Stephanopoulos, M.; Bo, L. & Patel, C.
Object Type: Report
System: The UNT Digital Library
Determination of the b-quark production cross section in p{anti p} collisions at 630 GeV (open access)

Determination of the b-quark production cross section in p{anti p} collisions at 630 GeV

We present a preliminary measurement of the b-quark production cross section in p{anti p} collisions at {radical}s = 630 GeV. The analysis is based on 340 nb{sup -1} of data collected with the D0 detector at the Fermilab Tevatron Collider. We determine the ratio of the b-quark production cross sections at 630 GeV to 1800 GeV and compare our results with the CDF and UA1 measurements, and with the next-to- leading order QCD predictions.
Date: October 1, 1997
Creator: Abbott, B.
Object Type: Article
System: The UNT Digital Library