States

Development of a numerical computer code and circuit element models for simulation of firing systems (open access)

Development of a numerical computer code and circuit element models for simulation of firing systems

Numerical simulation of firing systems requires both the appropriate circuit analysis framework and the special element models required by the application. We have modified the SPICE circuit analysis code (version 2G.6), developed originally at the Electronic Research Laboratory of the University of California, Berkeley, to allow it to be used on MSDOS-based, personal computers and to give it two additional circuit elements needed by firing systems--fuses and saturating inductances. An interactive editor and a batch driver have been written to ease the use of the SPICE program by system designers, and the interactive graphical post processor, NUTMEG, supplied by U. C. Berkeley with SPICE version 3B1, has been interfaced to the output from the modified SPICE. Documentation and installation aids have been provided to make the total software system accessible to PC users. Sample problems show that the resulting code is in agreement with the FIRESET code on which the fuse model was based (with some modifications to the dynamics of scaling fuse parameters). In order to allow for more complex simulations of firing systems, studies have been made of additional special circuit elements--switches and ferrite cored inductances. A simple switch model has been investigated which promises to give at …
Date: July 2, 1990
Creator: Carpenter, K.H. (Kansas State Univ., Manhattan, KS (USA). Dept. of Electrical and Computer Engineering)
Object Type: Report
System: The UNT Digital Library
Application of MeV ions to the analysis and modification of high temperature superconducting materials (open access)

Application of MeV ions to the analysis and modification of high temperature superconducting materials

In analyzing the composition of high {Tc} superconducting materials using heavy-ion RBS we discovered that the electronic excitation of the target caused mixing to occur. To study this effect we made superlattice structures of alternating thin layers of Ba{sub 2}YCu{sub 3}O{sub 6+x} and BaF{sub 2}. At this point in the process some mixing has occurred, but the individual layers are still visible. However, as the bombardment continued the layers were mixed together. It may well be that one can use this phenomenon to produce high {Tc} materials with a wide range of compositions. In this report, we discuss modifications to the high {Tc} superconductors and the subsequent analysis. 10 figs.
Date: November 2, 1990
Creator: Tombrello, T.A.
Object Type: Report
System: The UNT Digital Library
ONT High Gain Initiative WRAP (Wide Area Rapid Acoustic Prediction) computational performance section (open access)

ONT High Gain Initiative WRAP (Wide Area Rapid Acoustic Prediction) computational performance section

LLNL received a contract during March 1990 to perform three tasks for ONT. This letter report covers Task I which concerned a supercomputing effort in a program termed the High Gain Initiative, which is an anti-submarine (ASW) project that requires substantial computational and signal processing expertise. The core of the computational aspects at the present time is a code called WRAP (Wide Area Rapid Acoustic Prediction). LLNL's objective was to study the WRAP model and determine the feasibility and limits of its optimization. At the present time, the WRAP code runs on a single processor VAX computer.
Date: October 2, 1990
Creator: McGraw, J. R.; Hedstrom, G. & De Groot, T.
Object Type: Report
System: The UNT Digital Library
A microstructural study of creep and thermal fatigue deformation in 60Sn-40Pb solder joints (open access)

A microstructural study of creep and thermal fatigue deformation in 60Sn-40Pb solder joints

Thermal fatigue failures of solder joints in electronic devices often arise from cyclic shear strains imposed by the mismatched thermal expansion coefficients of the materials that bind the joint as temperature changes are encountered. Increased solder joint reliability demands a fundamental understanding of the metallurigical mechanisms that control the fatigue to design accurate accelerated probative tests and new, more fatigue resistant solder alloys. The high temperatures and slow strain rates that pertain to thermal fatigue imply that creep is an important deformation mode in the thermal fatigue cycle. In this work, the creep behaviour of a solder joint is studied to determine the solder's microstructural response to this type of deformation and to relate this to the more complex problem of thermal fatigue. It is shown that creep failures arise from the inherent inhomogeneity and instability of the solder microstructure and suggest that small compositional changes of the binary near-eutectic Pn-Sn alloy may defeat the observed failure mechanisms. This work presents creep and thermal fatigue data for several near-eutectic Pb-Sn solder compositions and concludes that a 58Sn-40Pb-2In and a 58Sn-40Pb-2Cd alloy show significantly enhanced fatigue resistance over that of the simple binary material. 80 refs., 33 figs., 1 tab.
Date: June 2, 1990
Creator: Tribula, D.
Object Type: Report
System: The UNT Digital Library
Potential Health Risks From Postulated Accidents Involving the Pu-238 RTG (Radioisotope Thermoelectric Generator) on the Ulysses Solar Exploration Mission (open access)

Potential Health Risks From Postulated Accidents Involving the Pu-238 RTG (Radioisotope Thermoelectric Generator) on the Ulysses Solar Exploration Mission

Potential radiation impacts from launch of the Ulysses solar exploration experiment were evaluated using eight postulated accident scenarios. Lifetime individual dose estimates rarely exceeded 1 mrem. Most of the potential health effects would come from inhalation exposures immediately after an accident, rather than from ingestion of contaminated food or water, or from inhalation of resuspended plutonium from contaminated ground. For local Florida accidents (that is, during the first minute after launch), an average source term accident was estimated to cause a total added cancer risk of up to 0.2 deaths. For accidents at later times after launch, a worldwide cancer risk of up to three cases was calculated (with a four in a million probability). Upper bound estimates were calculated to be about 10 times higher. 83 refs.
Date: November 2, 1990
Creator: Goldman, M. (California Univ., Davis, CA (USA)); Nelson, R.C. (EG and G Idaho, Inc., Idaho Falls, ID (USA)); Bollinger, L. (Air Force Inspection and Safety Center, Kirtland AFB, NM (USA)); Hoover, M.D. (Lovelace Biomedical and Environmental Research Inst., Albuquerque, NM (USA). Inhalation Toxicology Research Inst.); Templeton, W. (Pacific Northwest Lab., Richland, WA (USA)) & Anspaugh, L. (Lawren
Object Type: Article
System: The UNT Digital Library
Synthesis of model compounds for coal liquefaction research (open access)

Synthesis of model compounds for coal liquefaction research

The objectives of this project are to develop feasible synthetic routes to produce (1) 4(4{prime}- hydroxy- 5{prime},6{prime},7{prime},8{prime}- tetrahydro-1{prime}- naphthylmethyl)- 6-methyl dibenzothiophene, and (2) a 1-hydroxy naphthalene- dibenzothiophene polymer. These compounds are thought to be representative of sulfur containing molecules in coal. The program is divided into three tasks, the first of which is a project work plan that we have already submitted. Our experimental work during this quarter concentrated on Task 2: Synthesis of 4(4{prime}- hydroxy- 5{prime},6{prime},7{prime},8{prime}- tetrahydro-1{prime}- naphthylmethyl)- 6-methyldibenzothiophene. 11 refs.
Date: November 2, 1990
Creator: Hirschon, A. S.; Asaro, M. & Bottaro, J.
Object Type: Report
System: The UNT Digital Library
Energy conservation standards for new federal residential buildings: A decision analysis study using relative value discounting (open access)

Energy conservation standards for new federal residential buildings: A decision analysis study using relative value discounting

This report presents a reassessment of the proposed standard for energy conservation in new federal residential buildings. The analysis uses the data presented in the report, Economic Analysis: In Support of Interim Energy Conservation Standards for New Federal Residential Buildings (June 1988)-to be referred to as the EASIECS report. The reassessment differs from that report in several respects. In modeling factual information, it uses more recent forecasts of future energy prices and it uses data from the Bureau of the Census in order to estimate the distribution of lifetimes of residential buildings rather than assuming a hypothetical 25-year lifetime. In modeling social preferences decision analysis techniques are used in order to examine issues of public values that often are not included in traditional cost-benefit analyses. The present report concludes that the public would benefit from the proposed standard. Several issues of public values regarding energy use are illustrated with methods to include them in a formal analysis of a proposed energy policy. The first issue places a value on costs and benefits that will occur in the future as an irreversible consequence of current policy choices. This report discusses an alternative method, called relative value discounting which permits flexible discounting …
Date: July 2, 1990
Creator: Harvey, C. (Houston Univ., TX (USA). Coll. of Business Administration); Merkhofer, M.M. & Hamm, G.L. (Applied Decision Analysis, Inc., Menlo Park, CA (USA))
Object Type: Report
System: The UNT Digital Library
Exploratory coprocessing research (open access)

Exploratory coprocessing research

The objectives of this project are to: (1) study the scope of hydrothermal pretreatment of coal on subsequent conversion, (2) identify and study the chemical or physical causes of this effect, and (3) attempt to elucidate the chemistry responsible for any coal-resid synergisms. This project is divided into three tasks. This quarter we concentrated on Tasks 1 and 2. Task 1: Scope of aqueous pretreatment. Task 2: Chemistry of Pretreatment. Also during this quarter we investigated other means of pretreating low rank coal to enhance conversions. 6 refs., 1 fig., 2 tabs.
Date: November 2, 1990
Creator: Hirschon, A. S.; Tse, D. S.; Malhotra, R.; McMillen, D. F. & Ross, D. S.
Object Type: Report
System: The UNT Digital Library
SEM (Scanning Electron Microscopy) Analysis of Rock Varnish Chemistry for Cation-Ratio Dating: An Examination of Electron Beam Penetration Depths (open access)

SEM (Scanning Electron Microscopy) Analysis of Rock Varnish Chemistry for Cation-Ratio Dating: An Examination of Electron Beam Penetration Depths

Rock varnish is a microns-thick manganese- and iron-rich coating that forms on exposed rock surfaces in arid and semi-arid environments. Empirical correlations of the varnish cation ratio (K+Ca)/Ti with age have been used to estimate ages of geomorphic surfaces, with varnish chemistry generally acquired by either proton-induced x-ray emission (PIXE) analysis of natural varnish surfaces. Chemical analyses of rock varnish with SEM/EDX utilize a sequence of accelerating voltages to vary penetration depths into the sample. Using elemental x-ray maps of natural varnish surfaces with SEM/EDX, penetration into the substrate can be recognized at accelerating voltages where contamination with substrate is inferred from SEM/EDX chemical analyses. This demonstrates the ability of the SEM method to obtain varnish chemistry with minimal inclusion of substrate. Calculations of theoretical x-ray depth-distribution ({phi}({rho}z)) curves in varnish indicate that at an accelerating voltage of 10 kV most of the emitted electrons are generated in the upper 0.5 micron of a sample. At a higher voltage of 30 kV most of the signal is still restricted to the upper 2 microns, representing a very small percentage of total varnish volume in many cases. The ability of the SEM method to obtain empirical correlations of the chemistry of …
Date: April 2, 1990
Creator: Reneau, Steven L.; Raymond, Robert Jr.; Harrington, Charles D. & Hagan, Roland C.
Object Type: Article
System: The UNT Digital Library
NMR clinical imaging and spectroscopy: Its impact on nuclear medicine (open access)

NMR clinical imaging and spectroscopy: Its impact on nuclear medicine

This is a collection of four papers describing aspects of past and future use of nuclear magnetic resonance as a clinical diagnostic tool. The four papers are entitled (1) What Does NMR Offer that Nuclear Medicine Does Not by Jerry W. Froelich, (2) Oncological Imaging: Now, Future and Impact Jerry W. Froelich, (3) Magnetic Resonance Spectroscopy/Spectroscopic Imaging and Nuclear Medicine: Past, Present and Future by H. Cecil Charles, and (4) MR Cardiology: Now, Future and Impact by Robert J. Herfkens.
Date: February 2, 1990
Creator: unknown
Object Type: Report
System: The UNT Digital Library
The LLNL (Lawrence Livermore National Laboratory) ICF (Inertial Confinement Fusion) Program: Progress toward ignition in the Laboratory (open access)

The LLNL (Lawrence Livermore National Laboratory) ICF (Inertial Confinement Fusion) Program: Progress toward ignition in the Laboratory

The Inertial Confinement Fusion (ICF) Program at the Lawrence Livermore National Laboratory (LLNL) has made substantial progress in target physics, target diagnostics, and laser science and technology. In each area, progress required the development of experimental techniques and computational modeling. The objectives of the target physics experiments in the Nova laser facility are to address and understand critical physics issues that determine the conditions required to achieve ignition and gain in an ICF capsule. The LLNL experimental program primarily addresses indirect-drive implosions, in which the capsule is driven by x rays produced by the interaction of the laser light with a high-Z plasma. Experiments address both the physics of generating the radiation environment in a laser-driven hohlraum and the physics associated with imploding ICF capsules to ignition and high-gain conditions in the absence of alpha deposition. Recent experiments and modeling have established much of the physics necessary to validate the basic concept of ignition and ICF target gain in the laboratory. The rapid progress made in the past several years, and in particular, recent results showing higher radiation drive temperatures and implosion velocities than previously obtained and assumed for high-gain target designs, has led LLNL to propose an upgrade of …
Date: October 2, 1990
Creator: Storm, E.; Batha, S. H.; Bernat, T. P.; Bibeau, C.; Cable, M. D.; Caird, J. A. et al.
Object Type: Article
System: The UNT Digital Library
Marker evaluation of human breast and bladder cancers (open access)

Marker evaluation of human breast and bladder cancers

We are investigating multiple markers in human breast and bladder cancers. Our aim is to identify markers that are clinically relevant and that contribute to our understanding of the disease process in individual patients. Good markers accurately assess the malignant potential of a cancer in an individual patient. Thus, they help identify those cancers that will recur, and they may be used to predict more accurately time to recurrence, response to treatment, and overall prognosis. Therapy and patient management may then be optimized to the individual patient. Relevant markers reflect the underlying pathobiology of individual tumors. As a tissue undergoes transformation from benign to malignant, the cells lose their differentiated phenotype. As a generalization, the more the cellular phenotype, cellular proliferation and cellular genotype depart from normal, the more advanced is the tumor in its biological evolution and the more likely it is that the patient has a poor prognosis. We use three studies to illustrate our investigation of potential tumor markers. Breast cancers are labeled in vivo with 5-bromodeoxyuridine (BrdUrd) to give a direct measure of the tumor labeling index. Bladder cancers are analyzed immunocytochemically using an antibody against proliferation. Finally, the techniques of molecular genetics are used to …
Date: November 2, 1990
Creator: Mayall, B. H.; Carroll, P. R.; Chen, Ling-Chun; Cohen, M. B.; Goodson III, W. H.; Smith, H. S. et al.
Object Type: Article
System: The UNT Digital Library
Limits on the masses of supersymmetric particles from 1. 8 TeV p p collisions (open access)

Limits on the masses of supersymmetric particles from 1. 8 TeV p p collisions

Preliminary analysis of p{bar p} collision events at {radical}s = 1.8 TeV using events with large missing transverse energy and on two (four) jets in a minimal SUSY model places new limits on the masses of squarks (gluinos). The data sample (4 pb{sup {minus}1}) was taken in 1988--89 and is approximately 160 times as large as the data sample from our earlier 1987 run (25 nb{sup {minus}1}). 5 refs., 1 fig.
Date: October 2, 1990
Creator: Beretvas, A.
Object Type: Article
System: The UNT Digital Library
Texas Register, Volume 15, Number 75, Pages 5769-5820, October 2, 1990 (open access)

Texas Register, Volume 15, Number 75, Pages 5769-5820, October 2, 1990

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: October 2, 1990
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Texas Register, Volume 15, Number 83, Pages 6263-6345, November 2, 1990 (open access)

Texas Register, Volume 15, Number 83, Pages 6263-6345, November 2, 1990

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: November 2, 1990
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Texas Register, Volume 15, Number 9, Pages 511-628, February 2, 1990 (open access)

Texas Register, Volume 15, Number 9, Pages 511-628, February 2, 1990

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: February 2, 1990
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Texas Register, Volume 15, Number 17, Pages 1121-1207, March 2, 1990 (open access)

Texas Register, Volume 15, Number 17, Pages 1121-1207, March 2, 1990

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: March 2, 1990
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Texas Register, Volume 15, Number 1, Pages 1-59, January 2, 1990 (open access)

Texas Register, Volume 15, Number 1, Pages 1-59, January 2, 1990

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: January 2, 1990
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Texas Attorney General Opinion: JM-1139 (open access)

Texas Attorney General Opinion: JM-1139

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification; Whether a public security officer employed by the state or political subdivision is subject to licensing by the Commission on Law Enforcement Officer Standards and Education (RQ-1809)
Date: February 2, 1990
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: JM-1172 (open access)

Texas Attorney General Opinion: JM-1172

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification: Authority of a sheriff to impose a $20 fee on an inmate who is released on bond (RQ-1944)
Date: May 2, 1990
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: JM-1227 (open access)

Texas Attorney General Opinion: JM-1227

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification; Questions regarding article 3,section 52-a,of the Texas Constitutions(RQ-1779).
Date: October 2, 1990
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: LO90-68 (open access)

Texas Attorney General Opinion: LO90-68

Letter opinion issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification.
Date: October 2, 1990
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: LO90-69 (open access)

Texas Attorney General Opinion: LO90-69

Letter opinion issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification.
Date: October 2, 1990
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: LO90-87 (open access)

Texas Attorney General Opinion: LO90-87

Letter opinion issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification: Whether section 19 of the Cosmetology Regulatory Act allows the commission to require a beauty shop license for "people who act as independent contractors and rent a booth" in a licensed beauty shop.
Date: November 2, 1990
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History