29,181 Matching Results

Results open in a new window/tab.

1.8.3 Site system engineering FY 1997 program plan (open access)

1.8.3 Site system engineering FY 1997 program plan

The FY 1997 Multi-Year Work Plan (MYWP) technical baseline describes the functions to be accomplished and the technical standards that govern the work. The following information is provided in this FY 1997 MYWP: technical baseline, work breakdown structure, schedule baseline, cost baseline, and execution year.
Date: September 13, 1996
Creator: Grygiel, M. L.
Object Type: Report
System: The UNT Digital Library
[$1.43 Million Grant Award for Public School Arts Education to UNT Group] (open access)

[$1.43 Million Grant Award for Public School Arts Education to UNT Group]

A detailed document capturing the significant achievement of a $1.43 million grant awarded to a UNT group for advancing public school arts education.
Date: April 17, 1996
Creator: unknown
Object Type: Text
System: The UNT Digital Library
1: Mass asymmetric fission barriers for {sup 98}Mo; 2: Synthesis and characterization of actinide-specific chelating agents (open access)

1: Mass asymmetric fission barriers for {sup 98}Mo; 2: Synthesis and characterization of actinide-specific chelating agents

Excitation functions have been measured for complex fragment emission from the compound nucleus {sup 98}Mo, produced by the reaction of {sup 86}Kr with {sup 12}C. Mass asymmetric fission barriers have been obtained by fitting the excitation functions with a transition state formalism. The extracted barriers are {approximately} 5.7 MeV higher, on average, than the calculations of the Rotating Finite Range Model (RFRM). These data clearly show an isospin dependence of the conditional barriers when compared with the extracted barriers from {sup 90}Mo and {sup 94}Mo. Eleven different liquid/liquid extractants were synthesized based upon the chelating moieties 3,2-HOPO and 3,4-HOPO; additionally, two liquid/liquid extractants based upon the 1,2-HOPO chelating moiety were obtained for extraction studies. The Pu(IV) extractions, quite surprisingly, yielded results that were very different from the Fe(III) extractions. The first trend remained the same: the 1,2-HOPOs were the best extractants, followed closely by the 3,2-HOPOs, followed by the 3,4-HOPOs; but in these Pu(IV) extractions the 3,4-HOPOs performed much better than in the Fe(III) extractions. 129 refs.
Date: August 1, 1996
Creator: Veeck, A. C.
Object Type: Report
System: The UNT Digital Library
2-1/2-D electromagnetic modeling of nodular defects in high-power multilayer optical coatings (open access)

2-1/2-D electromagnetic modeling of nodular defects in high-power multilayer optical coatings

Advances in the design and production of high damage threshold optical coatings for use in mirrors and polarizers have been driven by the design requirements of high-power laser systems such as the proposed 1.8-MJ National Ignition Facility (NIF) and the prototype 12- kJ Beamlet laser system. The present design of the NIF will include 192 polarizers and more than 1100 mirrors. Currently, the material system of choice for high-power multilayer optical coatings with high damage threshold applications near 1.06 {mu}m are e-beam deposited HfO{sub 2}/Si0{sub 2} coatings. However, the optical performance and laser damage thresholds of these coatings are limited by micron-scale defects and insufficient control over layer thickness. In this report, we will discuss the results of our 2-1/2-D finite-element time- domain (FDTD) EM modeling effort for rotationally-symmetric nodular defects in multilayer dielectric HR coatings. We have added a new diagnostic to the 2-1/2-D FDTD EM code, AMOS, that enables us to calculate the peak steady-state electric fields throughout a 2-D planar region containing a 2-D r-z cross-section of the axisymmetric nodular defect and surrounding multilayer dielectric stack. We have also generated a series of design curves to identify the range of loss tangents for Si0{sub 2} and HfO{sub …
Date: July 1996
Creator: Molau, N. E.; Brand, H. R.; Kozlowski, M. R. & Shang, C. C.
Object Type: Report
System: The UNT Digital Library
(02.2) Scoping experiments; (02.3) long-term corrosion testing and properties evaluation of candidate waste package basket material (open access)

(02.2) Scoping experiments; (02.3) long-term corrosion testing and properties evaluation of candidate waste package basket material

The work described in this activity plan addresses Information Need 2.7.3 of the Yucca Mountain Site Characterization Plan (l), which reads Determination that the design criteria in lOCFR60.130 through 60.133 and any appropriate additional design objectives pertaining to criticality control have been met. This work falls under section WBS 1.2.2.5 2 (Basket Materials) of WBS 1.2.2.5 (Waste Package Materials) in the Work Breakdown Structure of the Yucca Mountain Site Characterization Project.
Date: December 20, 1996
Creator: VanKonynenburg, R. A.
Object Type: Report
System: The UNT Digital Library
The 2.3 {angstrom} crystal structure of cholera toxin B subunit pentamer: Choleragenoid (open access)

The 2.3 {angstrom} crystal structure of cholera toxin B subunit pentamer: Choleragenoid

Cholera toxin, a heterohexameric AB{sub 5} enterotoxin released by Vibrio cholera, induces a profuse secretory diarrhea in susceptible hosts. Choleragenoid, the B subunit pentamer of cholera toxin, directs the enzymatic A subunit to its target by binding to GM{sub 1} gangliosides exposed on the luminal surface of intestinal epithelial cells. We have solved the crystal structure of choleragenoid at 2.3 {Angstrom} resolution by combining single isomorphous replacement with non-crystallographic symmetry averaging. The structure of the B subunits, and their pentameric arrangement, closely resembles that reported for the intact holotoxin (choleragen), the heat-labile enterotoxin from E. coli, and for a choleragenoid-GM{sub 1} pentasaccharide complex. In the absence of the A subunit the central cavity of the B pentamer is a highly solvated channel. The binding of the A subunit or the receptor pentasaccharide to choleragenoid has only a modest effect on the local stereochemistry and does not perceptibly alter the subunit interface.
Date: February 1, 1996
Creator: Zhang, Rong-Guang; Westbrook, M. L.; Maulik, P. R.; Reed, R. A.; Shipley, G.; Westbrook, E. M. et al.
Object Type: Report
System: The UNT Digital Library
2 x 2 TeV mu(superscript +) mu (superscript) collider (open access)

2 x 2 TeV mu(superscript +) mu (superscript) collider

The scenarios for high-luminosity 2 x 2 TeV and 250 x 250 GeV {mu}{sup +}{mu}{sup -} colliders are presented. Having a high physics potential, such a machine has specific physics and technical advantages and disadvantages when compared with an e{sup +}e{sup -} collider. Parameters for the candidate designs and the basic components - proton source, pion production and decay channel, cooling, acceleration and collider storage ring - are considered. Attention is paid to the areas mostly affecting the collider performance: targetry, energy spread, superconducting magnet survival, detector backgrounds, polarization, environmental issues. 13 refs., 9 figs., 4 tabs.
Date: October 1, 1996
Creator: Mokhov, N. V. & Noble, R. J.
Object Type: Article
System: The UNT Digital Library
3-D electromagnetic modeling of wakefields in accelerator components (open access)

3-D electromagnetic modeling of wakefields in accelerator components

We discuss the use of 3-D finite-difference time-domain (FDTD) electromagnetic codes for modeling accelerator components. Computational modeling of cylindrically symmetric structures such as induction accelerator cells has been very successful in predicting the wake potential and wake impedances of these structures, but full 3-D modeling of complex structures has been limited due to substantial computer resources required for a full 3-D model. New massively parallel 3-D time domain electromagnetic codes now under development using conforming unstructured meshes allow a substantial increase in the geometric fidelity of the structures being modeled. Development of these new codes are discussed in context of applicability to accelerator problems. Various 3-D structures are tested with an existing cubical cell FDTD code and wake impedances compared with simple analytic models for the structures; results will be used as benchmarks for testing the new time time domain codes. Structures under consideration include a stripline beam position monitor as well as circular and elliptical apertures in circular waveguides. Excellent agreement for monopole and dipole impedances with models were found for these structures below the cutoff frequency of the beam line.
Date: September 18, 1996
Creator: Poole, B.R.; Caporaso, G.J.; Ng, Wang C.; Shang, C.C. & Steich, D.
Object Type: Article
System: The UNT Digital Library
3-dimensional wells and tunnels for finite element grids (open access)

3-dimensional wells and tunnels for finite element grids

Modeling fluid, vapor, and air injection and extraction from wells poses a number of problems. The length scale of well bores is centimeters, the region of high pressure gradient may be tens of meters and the reservoir may be tens of kilometers. Furthermore, accurate representation of the path of a deviated well can be difficult. Incorporating the physics of injection and extraction can be made easier and more accurate with automated grid generation tools that incorporate wells as part of a background mesh that represents the reservoir. GEOMESH is a modeling tool developed for automating finite element grid generation. This tool maintains the geometric integrity of the geologic framework and produces optimal (Delaunay) tetrahedral grids. GEOMESH creates a 3D well as hexagonal segments formed along the path of the well. This well structure is tetrahedralized into a Delaunay mesh and then embedded into a background mesh. The well structure can be radially or vertically refined and each well layer is assigned a material property or can take on the material properties of the surrounding stratigraphy. The resulting embedded well can then be used by unstructured finite element models for gas and fluid flow in the vicinity of wells or tunnels. …
Date: April 1, 1996
Creator: Cherry, T.A.; Gable, C.W. & Trease, H.
Object Type: Report
System: The UNT Digital Library
[4-Day Itinerary for Regional Institute Directors' Meeting] (open access)

[4-Day Itinerary for Regional Institute Directors' Meeting]

A detailed document outlining the meticulously planned itinerary for the upcoming 4-day Regional Institute Directors' Meeting. Explore the scheduled discussions, workshops, and strategic sessions designed to facilitate collaboration and advance regional educational initiatives.
Date: 1996-04-10/1996-04-14
Creator: unknown
Object Type: Text
System: The UNT Digital Library

5 Cookie jars and a broomstick

Access: Use of this item is restricted to the UNT Community
Recording of Paul Geladi's 5 Cookie jars and a broomstick. The piece is based on percussive sound. These come from 5 cookie jars and a broken aluminum broomstick found in a garbage container. All the sound were recorded with a SONY ECM 979 stereo microphone.
Date: 1996
Creator: Geladi, Paul
Object Type: Sound
System: The UNT Digital Library

5 Piccoli Ritmi

Access: Use of this item is restricted to the UNT Community
Recording of Agostino Di Scipio's 5 Piccoli Ritmi. For tape music with computer-processed guitar sounds and voice. This work divided into 5 short section, each announced by Spanish voice. The text being read is from a poem by H. Maturana. The sounds are derived from mixing and processing concrete sounds. The processing techniques includes an interactively operated method of real-time recursive granulation and time-shifting. Feedback controls were utilized, so that amplitude and density of the output sound affect the time shift ratio and the pitch in the algorithms.
Date: 1996
Creator: Di Scipio, Agostino
Object Type: Sound
System: The UNT Digital Library
5-Volt and 4.6 V plateaus in LiMn₂O₄ thin films (open access)

5-Volt and 4.6 V plateaus in LiMn₂O₄ thin films

Additional plateaus with median voltages of {similar_to}4.6 V, and {similar_to}5 V have been observed on charging thin film lithium batteries with crystalline LiMn{sub 2}O{sub 4} cathodes to 5.3 V. Total charge extracted from the 4 V and the two additional plateaus corresponded to about 1Li/Mn{sub 2}O{sub 4}, but the distribution of capacity among the three plateaus varied from film to film. It is speculated that the additional plateaus result from formation of mixed spinel structures in which a fraction of the 8a sites areoccupied by Mn{sup 2+} or Mn{sup 4+} ions and a fraction of the Li{sup +} ions occupy the 16d sites. After charging to 5.3 V, the 4.6 V plateau disappeared, and the capacity of the 4 V plateau increased at the expense of that of the 5 V plateau. The latter change is attributed to movement of Mn{sup 3+} or Mn{sup 5+} ions from 8a to 16d sites.
Date: January 1, 1996
Creator: Bates, J. B.; Lubben, D.; Dudney, N. J.; Zuhr, R. A. & Hart, F. X.
Object Type: Article
System: The UNT Digital Library
6 GeV synchrotron x-ray source: Conceptual design report. Supplement B - conceptual design of proposed beam lines for the 6 GeV light source (open access)

6 GeV synchrotron x-ray source: Conceptual design report. Supplement B - conceptual design of proposed beam lines for the 6 GeV light source

In this document, preliminary conceptual designs are presented for ten sample beamlines for the 6 GeV Light Source. These beamlines will accommodate investigations in solid-state physics, materials science, materials technology, chemical technology, and biological and medical sciences. In future, the designs will be altered to include new developments in x-ray optics and hardware technologies. The research areas addressed by the samples beamlines are as follows: Topography and Radiography/Tomography (section 2); Inelastic Scattering with Ultrahigh Energy Resolution (Section 3); Surface and Bulk Studies Using High Momentum Resolution (Section 4); Inelastic Scattering from Charge and Spin (Section 5); Advanced X-Ray Photoelectron Spectroscopy Studies (Section 6); Small Angle X-Ray Scattering Studies (Section 7); General Purpose Scattering for Materials Studies (Section 8); Multiple-Energy Anomalous-Dispersion Studies of Proteins (Section 9); Protein Crystallography (Section 10); Time- and Space-resolved X-Ray Spectroscopy (Section 11); Medical Diagnostic Facility (Section 12); and Transuranium Research Facility (Section 13). The computer systems to be used on the beamlines are also discussed in Section 14 of this document.
Date: March 1, 1996
Creator: unknown
Object Type: Report
System: The UNT Digital Library

[8-Year Old Tareq Musleh]

School photograph of 9-year-old Tareq Musleh. There is a small sticker on the right-hand corner in Arabic. The writing on the back of the photograph reads, "Dear Daddy, I love you. You are the best. I miss you. I want to visit you or you visit me. I want to go to America. Love, Your son, Tareq."
Date: 1996
Creator: unknown
Object Type: Photograph
System: The Portal to Texas History
The 10,000-year debate (open access)

The 10,000-year debate

Probabilistic Risk Assessment (PRA) has developed into a respected tool within the reactor community. Now, this PRA technique is being applied to a new arena, the distant future of the nuclear waste repository. Problems are already testing the credibility of PRA.
Date: August 1996
Creator: Wilson, J. R.
Object Type: Article
System: The UNT Digital Library
10. international mouse genome conference (open access)

10. international mouse genome conference

Ten years after hosting the First International Mammalian Genome Conference in Paris in 1986, Dr. Jean-Louis Guenet presided over the Tenth Conference at the Pasteur Institute, October 7--10, 1996. The 1986 conference was a satellite to the Human Gene Mapping Workshop and had approximately 50 attendees. The 1996 meeting was attended by 300 scientists from around the world. In the interim, the number of mapped loci in the mouse increased from 1,000 to over 20,000. This report contains a listing of the program and its participants, and two articles that review the meeting and the role of the laboratory mouse in the Human Genome project. More than 200 papers were presented at the conference covering the following topics: International mouse chromosome committee meetings; Mutant generation and identification; Physical and genetic maps; New technology and resources; Chromatin structure and gene regulation; Rate and hamster genetic maps; Informatics and databases; and Quantitative trait analysis.
Date: December 31, 1996
Creator: Meisler, M. H.
Object Type: Article
System: The UNT Digital Library
12 PWR Assembly MPC Waste Package Criticality Analysis (open access)

12 PWR Assembly MPC Waste Package Criticality Analysis

This analysis was prepared to determine the viability of the MPC PWR-12 waste package concept with respect to criticality regulatory requirements in compliance with the goals of the Waste Package Implementation Plans for conceptual design.
Date: January 18, 1996
Creator: Davis, J.
Object Type: Report
System: The UNT Digital Library
A 20 ampere shunt regulator for controlling individual magnets in a seriesed string (open access)

A 20 ampere shunt regulator for controlling individual magnets in a seriesed string

At the CEBAF accelerator, groups of dipole magnets are often connected together in series and powered from a single large constant-current regulated D-C supply, referred to locally as a {open_quotes}box{close_quotes} supply. Besides the economy realized, this configuration promotes correct field tracking of all elements of a beam transport channel. However, it is often desirable to vary the current in one element of a string independently of the others, particularly at the entrance and exits of transport channels. A 20 ampere programmable current shunt is described. Installed in parallel with the desired magnet, it permits shunting (bypassing) up to 5% of the string current around that magnet. The shunt regulator consists of a bank of MOSFET power transistors operated in linear mode. Regulation of current through the passbank is obtained by feedback from a manganin shunt maintained at a constant temperature for stability. The module is designed for remote operation and provides readbacks of various parameters useful for maintenance. To achieve complete electrical isolation, an onboard microprocessor provides remote communications via an opto-isolated serial data link. Constructional details and initial operating experience with the plug-in shunt are described.
Date: August 1, 1996
Creator: Martin, E. J.; Dobeck, N.; Jones, G. S. & O`Sullivan, M. K.
Object Type: Article
System: The UNT Digital Library
45-day safety screening results and final report for Tank 241-BX-106, auger samples 95-AUG-049 and 95-AUG-050 (open access)

45-day safety screening results and final report for Tank 241-BX-106, auger samples 95-AUG-049 and 95-AUG-050

Two Auger Samples from tank 241-BX-106 were received at the 222-S Laboratory and underwent safety screening analyses - differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), total alpha analysis, and bulk density measurements - in accordance with the sampling and analysis plan.
Date: January 1, 1996
Creator: Sasaki, L.M.
Object Type: Report
System: The UNT Digital Library
45-Day safety screening results for tank 241-U-102, push mode cores 143 and 144 (open access)

45-Day safety screening results for tank 241-U-102, push mode cores 143 and 144

This document is the 45-day report deliverable for tank 241-U-102 push mode core segments collected between April 16, 1996 and May 6, 1996 and received by the 222-S Laboratory between April 17, 1996 and May 8, 1996. The segments were subsampled and analyzed in accordance, with the Tank 241-U-102 Push Mode Core Sampling and analysis Plan (TSAP) (Hu, 1996) and the Safety Screening Data Quality Objective (DQO) (Dukelow, et al., 1995). The analytical results are included in Table 1. Attachment I is a cross reference to relate the tank farm identification numbers to the 222-S Laboratory LabCore sample numbers. The subsamples generated in the laboratory for analysis are identified in these diagrams with their sources shown. The diagram identifying the hydrostatic head fluid (HHF) blank is also included, Primary safety screening results and the raw data from Differential Scanning Calorimetry (DSC) and thermogravimetric analysis (TGA) analyses are included in this report. Two of the samples submitted for DSC analysis exceeded notification limits as stated in the Safety Screening DQO (Dukelow, et al., 1995). Cyanide analysis was requested on these samples and a Reactive System Screening Tool analysis was requested for the sample exhibiting the highest exothenn in accordance with the …
Date: June 28, 1996
Creator: Steen, F. H.
Object Type: Report
System: The UNT Digital Library
45-day safety screening results for Tank 241-U-107, Push Mode Cores 129, 134 and 135 (open access)

45-day safety screening results for Tank 241-U-107, Push Mode Cores 129, 134 and 135

This document summarizes the results of the push mode core samples for tank 241-U-107.
Date: June 4, 1996
Creator: Jo, J., Westinghouse Hanford
Object Type: Report
System: The UNT Digital Library
60-day waste compatibility safety issue and final results for 244-TX DCRT, grab samples TX-95-1, TX-95-2, and TX-95-3 (open access)

60-day waste compatibility safety issue and final results for 244-TX DCRT, grab samples TX-95-1, TX-95-2, and TX-95-3

Three grab samples (TX-95-1, TX-95-2, and TX-95-3) were taken from tank 241- TX-244 riser 8 on November 7, 1995 and received by the 222-S Laboratory on that same day. Samples TX-95-1 and TX-95-2 were designated as supernate liquids, and sample TX-95-3 was designated as a supernate/sludge. These samples were analyzed to support the waste compatibility safety program. Accuracy and precision criteria were met for all analyses. No notifications were required based on sample results. This document provides the analysis to support the waste compatibility safety program.
Date: January 1, 1996
Creator: Esch, R.A.
Object Type: Report
System: The UNT Digital Library
94-1 Research and Development Project lead laboratory support: Fiscal year 1997. Progress report (open access)

94-1 Research and Development Project lead laboratory support: Fiscal year 1997. Progress report

On May 26, 1994, the Defense Nuclear Facilities Safety Board (DNFSB) issued Recommendation 94-1, which expressed the board`s concern about nuclear materials left in the manufacturing pipeline after the US halted its nuclear weapons production activities. The DNFSB emphasized the need for remediation of these materials. As part of Recommendation 94-1, the DNFSB defined research objectives as follows: that a research program be established to fill any gaps in the information base needed for choosing among the alternate processes to be used in safe conversion of various types of fissile materials to optimal forms for safe interim storage and the longer-term disposition. To achieve this objective a research and technology development program with two elements is needed: a technology-specific program that is focused on treating and storing materials safety, with concomitant development of storage criteria and surveillance requirements, centered around 3- and 8-year targets; and a core technology program to augment the knowledge base about general chemical and physical processing and storage behavior and to assure safe interim material storage until disposition policies are formulated. The paper reports the progress on the following: materials identification and surveillance; stabilization process development; surveillance and monitoring; core technologies; and project management.
Date: December 1, 1996
Creator: McKee, S.D.
Object Type: Report
System: The UNT Digital Library