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265,133 Matching Results

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Best Match Title Creator Date Created (Newest) Date Created (Oldest) Date Added (Newest) Date Added (Oldest)
Can Data Recognize Its Parent Distribution? (open access)

Can Data Recognize Its Parent Distribution?

This study is concerned with model selection of lifetime and survival distributions arising in engineering reliability or in the medical sciences. We compare various distributions, including the gamma, Weibull and lognormal, with a new distribution called geometric extreme exponential. Except for the lognormal distribution, the other three distributions all have the exponential distribution as special cases. A Monte Carlo simulation was performed to determine sample sizes for which survival distributions can distinguish data generated by their own families. Two methods for decision are by maximum likelihood and by Kolmogorov distance. Neither method is uniformly best. The probability of correct selection with more than one alternative shows some surprising results when the choices are close to the exponential distribution.
Date: May 1, 1999
Creator: A.W.Marshall; J.C.Meza & Olkin, and I.
Object Type: Report
System: The UNT Digital Library
[Photograph 2012.201.B1093.0273]

[Photograph 2012.201.B1093.0273]

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Cliff Robertson stars as an overpressured executive who turns to family memories to understand present problems in the world premiere of "My Father's House" on ABC-TV Network Sunday, June 1."
Date: May 13, 1975
Creator: ABC Network Photo Release
Object Type: Photograph
System: The Gateway to Oklahoma History
[Project Summary: Deepwater Program: The Technology and Economics of Deepwater Production Projects] (open access)

[Project Summary: Deepwater Program: The Technology and Economics of Deepwater Production Projects]

Report summary describing the work completed at ABS Group, Inc. for 'Deepwater Program: The Technology and Economics of Deepwater Production Projects'. It includes background information on the project funding and sponsorship, goals, methodology, and findings.
Date: May 2004
Creator: ABS Group, Inc.
Object Type: Text
System: The UNT Digital Library
[News release: Ninth Circuit Rejects Army's Request for Rehearing En Banc in Pruitt v. Cheney] (open access)

[News release: Ninth Circuit Rejects Army's Request for Rehearing En Banc in Pruitt v. Cheney]

A joint news release from ACLU Foundation of Southern California and Lambda Legal Defense and Education Fund, Inc. addressing the Ninth Court of Appeal's rejection of a petition that called for a rehearing of the U.S. military's landmark decision to ban LGBT from the U.S. Armed Services.
Date: May 8, 1992
Creator: ACLU Foundation of Southern California
Object Type: Text
System: The UNT Digital Library
[Fax: ACT UP/ Presidential Project] (open access)

[Fax: ACT UP/ Presidential Project]

A fax from ACT UP addressing independent presidential candidate, H. Ross Perot, saying he was planning on avoiding the controversy surrounding LGBT cabinet appointments.
Date: May 30, 1992
Creator: ACT UP
Object Type: Text
System: The UNT Digital Library
Microstructure, Phase Formation, and Stress of Reactively-Deposited Metal Hydride Thin Films (open access)

Microstructure, Phase Formation, and Stress of Reactively-Deposited Metal Hydride Thin Films

This document summarizes research of reactively deposited metal hydride thin films and their properties. Reactive deposition processes are of interest, because desired stoichiometric phases are created in a one-step process. In general, this allows for better control of film stress compared with two-step processes that react hydrogen with pre-deposited metal films. Films grown by reactive methods potentially have improved mechanical integrity, performance and aging characteristics. The two reactive deposition techniques described in this report are reactive sputter deposition and reactive deposition involving electron-beam evaporation. Erbium hydride thin films are the main focus of this work. ErH{sub x} films are grown by ion beam sputtering erbium in the presence of hydrogen. Substrates include a Al{sub 2}O{sub 3} {l_brace}0001{r_brace}, a Al{sub 2}O{sub 3} {l_brace}1120{r_brace}, Si{l_brace}001{r_brace} having a native oxide, and polycrystalline molybdenum substrates. Scandium dideuteride films are also studied. ScD{sub x} is grown by evaporating scandium in the presence of molecular deuterium. Substrates used for scandium deuteride growth include single crystal sapphire and molybdenum-alumina cermet. Ultra-high vacuum methods are employed in all experiments to ensure the growth of high purity films, because both erbium and scandium have a strong affinity for oxygen. Film microstructure, phase, composition and stress are evaluated using a …
Date: May 1, 2002
Creator: ADAMS, DAVID P.; ROMERO, JUAN A.; RODRIGUEZ, MARK A.; FLORO, JERROLD A. & KOTULA, PAUL G.
Object Type: Report
System: The UNT Digital Library
[News Release: Firscal Reports Approved] (open access)

[News Release: Firscal Reports Approved]

A news release from the AIDS ARMS Network announcing that their fiscal reports had been accepted and that the Network's partners will continue to be able to assist persons with HIV/AIDS but that some employees of the Oak Lawn Counseling Center could no longer be compensated for their work.
Date: May 16, 1988
Creator: AIDS ARMS Network
Object Type: Text
System: The UNT Digital Library
[Blank financial report form] (open access)

[Blank financial report form]

A blank financial statement form created by the AIDS ARMS Network, Inc. for the AIDS Resource Center for May 1990.
Date: May 31, 1990
Creator: AIDS ARMS Network, Inc.
Object Type: Text
System: The UNT Digital Library
[Meeting minutes for subcontractors meeting, May 21, 1990] (open access)

[Meeting minutes for subcontractors meeting, May 21, 1990]

Meeting minutes for an AIDS ARMS Network, Inc. subcontractors' meeting which took place on May 21, 1990.
Date: May 21, 1990
Creator: AIDS ARMS Network, Inc.
Object Type: Text
System: The UNT Digital Library
[Monthly financial report, May 31, 1989] (open access)

[Monthly financial report, May 31, 1989]

A financial statement from the AIDS Resource Center for the AIDS ARMS Network, Inc., dated May 31, 1989.
Date: May 31, 1989
Creator: AIDS ARMS Network, Inc.
Object Type: Report
System: The UNT Digital Library
[AIDS Coordinating Committee] (open access)

[AIDS Coordinating Committee]

A brief description of the ideas and information Buck Buckingham presented to the AIDS Coordinating Committee to further improve the AIDS ARMS Network.
Date: May 23, 1988
Creator: AIDS Coordinating Committee
Object Type: Text
System: The UNT Digital Library
AIDS Update, Volume 3, Number 5, May 1988 (open access)

AIDS Update, Volume 3, Number 5, May 1988

Newsletter of the AIDS Resource Center containing news updates, articles, opinion pieces, and advertisements related to the work of the organization. Cover: photo of the AIDS Memorial Quilt, advertising a display of the quilt in May, 1988.
Date: May 1988
Creator: AIDS Resource Center
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
[Clipping: AIDS Update: The Newsletter of the AIDS Resource Center] (open access)

[Clipping: AIDS Update: The Newsletter of the AIDS Resource Center]

May 1993, Volume VIII, Number 5 edition of The AIDS Resource Center newsletter. The newsletter features "AIDS Update" information about resources, events, and services.
Date: May 1993
Creator: AIDS Resource Center
Object Type: Clipping
System: The UNT Digital Library
AIDS Update, May 1988 (open access)

AIDS Update, May 1988

Monthly newsletter describing news and events related to the AIDS Resource Center in Dallas, Texas as well as articles, letters, advice columns, and advertisements of interest to subscribers.
Date: May 1988
Creator: AIDS Resource Center (Dallas, Tex.)
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
AIDS Update, Volume 3, Number 5, May 1988 (open access)

AIDS Update, Volume 3, Number 5, May 1988

Monthly newsletter describing news and events related to the AIDS Resource Center in Dallas, Texas as well as articles, letters, advice columns, and advertisements of interest to subscribers.
Date: May 1988
Creator: AIDS Resource Center (Dallas, Tex.)
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
AIDS Update, Volume 5, Number 5, May 1990 (open access)

AIDS Update, Volume 5, Number 5, May 1990

Monthly newsletter describing news and events related to the AIDS Resource Center in Dallas, Texas as well as articles, letters, advice columns, and advertisements of interest to subscribers.
Date: May 1990
Creator: AIDS Resource Center (Dallas, Tex.)
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
Representative volume size: A comparison of statistical continuum mechanics and statistical physics (open access)

Representative volume size: A comparison of statistical continuum mechanics and statistical physics

In this combination background and position paper, the authors argue that careful work is needed to develop accurate methods for relating the results of fine-scale numerical simulations of material processes to meaningful values of macroscopic properties for use in constitutive models suitable for finite element solid mechanics simulations. To provide a definite context for this discussion, the problem is couched in terms of the lack of general objective criteria for identifying the size of the representative volume (RV) of a material. The objective of this report is to lay out at least the beginnings of an approach for applying results and methods from statistical physics to develop concepts and tools necessary for determining the RV size, as well as alternatives to RV volume-averaging for situations in which the RV is unmanageably large. The background necessary to understand the pertinent issues and statistical physics concepts is presented.
Date: May 1, 1999
Creator: AIDUN,JOHN B.; TRUCANO,TIMOTHY G.; LO,CHI S. & FYE,RICHARD M.
Object Type: Report
System: The UNT Digital Library
Molecular dynamic simulations, {sup 6}Li solid state NMR and ultraphosphate glasses (open access)

Molecular dynamic simulations, {sup 6}Li solid state NMR and ultraphosphate glasses

The author's laboratory continues to use NMR to investigate the structure and dynamics in amorphous materials, including the local structure of ultraphosphate glasses. Changes in the alkali environment in these phosphate glasses as a function of modifier concentration has recently been probed using {sup 6}Li and {sup 23}Na solid state NMR. Molecular dynamic (MD) simulations have also been performed in an attempt to gain additional insight into the variations of the local structure. Interestingly, although there are distinct variations in the Li coordination number as well as the Li-O bond lengths in the MD simulations (with a minimum or maximum in these parameters near the 20% Li{sub 2}O concentration), a linear change in the {sup 6}Li NMR chemical shift is observed between 5 and 50% Li{sub 2}O mole fraction. One would expect that such variations should be observable in the NMR chemical shift. In an attempt to understand this behavior the author has performed empirical calculation of the {sup 6}Li NMR chemical shift directly from the structures obtained in the MD simulations. It has been argued that the NMR chemical shift of alkali species can be related to a chemical shift parameter A, where A is defined as the summation …
Date: May 1, 2000
Creator: ALAM,TODD M.
Object Type: Article
System: The UNT Digital Library
THERMAL CONDUCTIVITY AND OTHER PROPERTIES OF CEMENTITIOUS GROUTS (open access)

THERMAL CONDUCTIVITY AND OTHER PROPERTIES OF CEMENTITIOUS GROUTS

The thermal conductivity and other properties cementitious grouts have been investigated in order to determine suitability of these materials for grouting vertical boreholes used with geothermal heat pumps. The roles of mix variables such as water/cement ratio, sand/cement ratio and superplasticizer dosage were measured. In addition to thermal conductivity, the cementitious grouts were also tested for bleeding, permeability, bond to HDPE pipe, shrinkage, coefficient of thermal expansion, exotherm, durability and environmental impact. This paper summarizes the results for selected grout mixes. Relatively high thermal conductivities were obtained and this leads to reduction in predicted bore length and installation costs. Improvements in shrinkage resistance and bonding were achieved.
Date: May 1, 1998
Creator: ALLAN,M.
Object Type: Article
System: The UNT Digital Library
[Project Summary: EcoSpatial Information Database (ESID)] (open access)

[Project Summary: EcoSpatial Information Database (ESID)]

Summary describing the work completed at AMEC Environment & Infrastructure, Inc. for the EcoSpatial Information Database (ESID). It includes background information on the project funding and sponsorship, goals, methodology, and findings.
Date: May 2014
Creator: AMEC Environment & Infrastructure, Inc.
Object Type: Text
System: The UNT Digital Library
Cloud to CAD (open access)

Cloud to CAD

This paper documents work performed to convert scanned range data to CAD solid model representation. The work successfully developed surface fitting algorithms for quadric surfaces (e.g. plane, cone, cylinder, and sphere), and a segmentation algorithm based entirely on surface type, rather than on a differential metric like Gaussian curvature. Extraction of all CAD-required parameters for quadric surface representation was completed. Approximate face boundaries derived from the original point cloud were constructed. Work to extrapolate surfaces, compute exact edges and solid connectivity was begun, but left incomplete due to funding reductions. The surface fitting algorithms are robust in the face of noise and degenerate surface forms.
Date: May 1, 2001
Creator: AMES,ARLO L.
Object Type: Report
System: The UNT Digital Library
Use of inelastic analysis in cask design (open access)

Use of inelastic analysis in cask design

In this paper, the advantages and disadvantages of inelastic analysis are discussed. Example calculations and designs showing the implications and significance of factors affecting inelastic analysis are given. From the results described in this paper it can be seen that inelastic analysis provides an improved method for the design of casks. It can also be seen that additional code and standards work is needed to give designers guidance in the use of inelastic analysis. Development of these codes and standards is an area where there is a definite need for additional work. The authors hope that this paper will help to define the areas where that need is most acute.
Date: May 15, 2000
Creator: AMMERMAN,DOUGLAS J. & BREIVIK,NICOLE L.
Object Type: Article
System: The UNT Digital Library
ENGINEERING OF THE AGS SNAKE COIL ASSEMBLY. (open access)

ENGINEERING OF THE AGS SNAKE COIL ASSEMBLY.

A 30% Snake superconducting magnet is proposed to maintain polarization in the AGS proton beam, the magnetic design of which is described elsewhere. The required helical coils for this magnet push the limits of the technology developed for the RHIC Snake coils. First, fields must be provided with differing pitch along the length of the magnet. To accomplish this, a new 3-D CAD system (''Pro/Engineer'' from PTC), which uses parametric techniques to enable fast iterations, has been employed. Revised magnetic field calculations are then based on the output of the mechanical model. Changes are made in turn to the model on the basis of those field calculations. To ensure that accuracy is maintained, the final solid model is imported directly into the CNC machine programming software, rather than by the use of graphics translating software. Next, due to the large coil size and magnetic field, there was concern whether the structure could contain the coil forces. A finite element analysis was performed, using the 3-D model, to ensure that the stresses and deflections were acceptable. Finally, a method was developed using ultrasonic energy to improve conductor placement during coil winding, in an effort to minimize electrical shorts due to conductor …
Date: May 12, 2003
Creator: ANERELLA,M. GUPTA,R. KOVACH,P. MARONE,A. PLATE,S. POWER,K. SCHMALZLE,J. WILLEN,E.
Object Type: Article
System: The UNT Digital Library
OPTIMUM ENERGY ABSORPTION OF A SHORT-PULSE LASER IN A DOPED DIELECTRIC SLAB (open access)

OPTIMUM ENERGY ABSORPTION OF A SHORT-PULSE LASER IN A DOPED DIELECTRIC SLAB

A model is used to calculate energy absorption efficiency when a short-pulse laser impinges on a dielectric slab doped with an impurity for which the electrons have a resonant line at the laser wavelength. The amount of the energy resonant absorption is due to the overlapping between laser spectrum and resonance spectrum. The energy absorption efficiency can be maximized for a certain degree of doping concentration (at a given pulselength) and also for a certain pulselength (at a given doping concentration). For a modest amount of impurity, the resonant absorption may increase the fraction of energy absorption up to tens of percent of laser energy at 100s optical cycles when the laser wavelength is tuned within 1% of the resonant line. Dimensionless parameters are constructed so that the scaling to various parameters: laser wavelength, laser pulselength, dielectric constant, slab thickness, impurity concentration, resonant linewidth, and separation between the laser wavelength and the line resonance, could easily be obtained.
Date: May 1, 2001
Creator: ANG, L.
Object Type: Article
System: The UNT Digital Library