Electric power monthly, October 1991. [CONTAINS GLOSSARY] (open access)

Electric power monthly, October 1991. [CONTAINS GLOSSARY]

This publication provides monthly statistics at the national, Census division, and State levels for net generation, fuel consumption, fuel stocks, quantity and quality of fuel, cost of fuel, electricity sales, revenue, and average revenue per kilowatthour of electricity sold. Data on net generation, fuel consumption, fuel stocks, quantity and cost of fuel are also displayed at the North American Electric Reliability Council (NERC) region level. Additionally, statistics at the company and plant level are published in the EPM on capability of new plants, net generation, fuel consumption, fuel stocks, quantity and quality of fuel, and cost of fuel. 4 figs., 63 tabs.
Date: October 11, 1991
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Establishment and maintenance of a coal sample bank and data base (open access)

Establishment and maintenance of a coal sample bank and data base

In this Project Status Report for 7/9/89--10/8/89, results of a comparative study of coal sample deterioration in several container types were presented. In April 1990, one year after the initial analyses, the set of analyses was repeated on the most important container types. The new results are included in Table 2. During the current reporting period a total of 42 data printouts were distributed. In addition, 7 special data requests were fulfilled by either search/sort and printout or creation of a data disk, resulting in distribution of limited information on 2083 samples. Several preliminary requests for Sample Bank and Data Base information and price quotations have also been handled.
Date: July 11, 1990
Creator: Davis, A.
Object Type: Report
System: The UNT Digital Library
Finite element analysis of the SDC barrel and endcap calorimeters (open access)

Finite element analysis of the SDC barrel and endcap calorimeters

In designing the SCD barrel and endcap calorimeters, the inter-module connecting forces must be known in order to determine the required size and number of connecting links between modules, and in order to understand how individual modules will be affected by these forces when assembled to form a full barrel and endcap. The connecting forces were found by analyzing three-dimensional Finite Element Models of both the barrel and endcap. This paper is divided into two parts, the first part will describe in detail the results of the barrel analysis and the second part will describe the results obtained from the endcap analysis. A similar approach was used in constructing the models for both analysis.
Date: March 11, 1992
Creator: Guarino, V.; Hill, N. & Nasiakta, J.
Object Type: Report
System: The UNT Digital Library
Application of automated deduction to the search for single axioms for exponent groups (open access)

Application of automated deduction to the search for single axioms for exponent groups

We present new results in axiomatic group theory obtained by using automated deduction programs. The results include single axioms, some with the identity and others without, for groups of exponents 3, 4, 5 and 7, and a general form for single axioms for groups of odd exponent. The results were obtained by using the programs in three separate ways: as a symbolic calculator, to search for proofs,and to search for couterexamples. We also touch on relations between logic programming and automated reasoning.
Date: February 11, 1992
Creator: McCune, W. & Wos, L.
Object Type: Article
System: The UNT Digital Library
Effects of oxide layers on optical properties and x-ray hardness of Al-Be mirrors (open access)

Effects of oxide layers on optical properties and x-ray hardness of Al-Be mirrors

Oxide layers form on the surfaces of many metallic mirrors. The oxidation may occur during fabrication or after the mirror is finished and installed. Some oxide layers may be intentionally added to protect the mirror or to change its optical properties. Computer calculations predict the effect of oxide layers on optical and ultraviolet reflectance as well as the x-ray absorption and concomitant thermal damage to the mirrors. 6 refs., 6 figs., 1 tab.
Date: June 11, 1991
Creator: White, R.H. & Wirtenson, G.R.
Object Type: Report
System: The UNT Digital Library
Separation of products from mild coal gasification processes (open access)

Separation of products from mild coal gasification processes

The primary mild coal gasification product mixture containing noncondensible gas, high-boiling hydrocarbon vapors and entrained fines is difficult to process into the desired pure products: gas, liquids, and dry solids. This challenge for mild coal gasification process development has been studied by surveying the technical literature for suitable separations processes and for similar issues in related processes. The choice for a first-stage solids separation step is standard cyclones, arranged in parallel trains for large-volume applications in order to take advantage of the higher separation efficiency of smaller cyclones. However, mild gasification pilot-plant data show entrainment of ultrafine particles for which standard cyclones have poor separation efficiency. A hot secondary solids separation step is needed for the ultrafine entrainment in order to protect the liquid product from excessive amounts of contaminating solids. The secondary solids separation step is similar to many high-temperature flue-gas applications with an important complicating condition: Mild gasifier vapors form coke on surfaces in contact with the vapors. Plugging of the filter medium by coke deposition is concluded to be the main product separation problem for mild gasification. Three approaches to solution of this problem are discussed in the order of preference: (1) a barrier filter medium made …
Date: September 11, 1991
Creator: Wallman, P. H.
Object Type: Report
System: The UNT Digital Library
An exponential model for HPGe detector efficiencies (open access)

An exponential model for HPGe detector efficiencies

Interest in reducing the labor-intensive requirements for calibrating HPGe detectors has resulted in various efficiency models. The present study examines a method for predicting the efficiencies over ranges of sample geometries, whereby only a few measurements are required. The method has been appraised against extensive HPGe calibrations, and has been used for a nondestructive'' calibration for samples from a NASA satellite.
Date: June 11, 1991
Creator: Winn, Willard G.
Object Type: Article
System: The UNT Digital Library
Conformal Field Theories: From Old to New (open access)

Conformal Field Theories: From Old to New

In a short review of recent work, we discuss the general problem of constructing the actions of new conformal field theories from old conformal field theories. Such a construction follows when the old conformal field theory admits new conformal stress tensors in its chiral algebra, and it turns out that the new conformal field theory is generically a new spin-two gauge theory. As an example we discuss the new spin-two gauged sigma models which arise in this fashion from the general conformal non-linear sigma model.
Date: February 11, 1998
Creator: Halpern, M. B. & Schwartz, C.
Object Type: Article
System: The UNT Digital Library
Soft x-ray laser gain prediction at high density for the nitrogen isoelectronic sequence (open access)

Soft x-ray laser gain prediction at high density for the nitrogen isoelectronic sequence

In model calculation, population inversions for 2s{sup 2}2p{sup 2}3s-2s{sup 2}2p{sup 2}3p and for 2s{sup 2}2p{sup 2}d3p-2s{sup 2}2p{sup 2}3d are predicted for ions of the N-like isoelectronic sequence (Kr{sup 29+}, Zr{sup 33+}, Mo{sup 35+}, Pd{sup 39+}, Sn{sup 43+} and Xe{sup 47+}), at electron densities higher than 10{sup 22} cm{sup {minus}3}. Maximum gains of 46 cm{sup {minus}1} for Kr{sup 29+} at 245{angstrom}, and 231 cm{sup {minus}1} at 126{angstrom} for Xe{sup 47+} are obtained. The electron temperature T{sub e} is fixed at half the ionization potential for all ions. A detailed analysis shows that the mechanisms responsible for the population inversion enhancement are collisional de-excitation and radiation trapping. 16 refs., 6 figs.
Date: January 11, 1991
Creator: Klapisch, M. (Lawrence Berkeley Lab., CA (USA)); Cohen, M.; Goldstein, W.H. (Lawrence Livermore National Lab., CA (USA)) & Feldman, U. (Naval Research Lab., Washington, DC (USA). E.O. Hulburt Center for Space Research)
Object Type: Article
System: The UNT Digital Library
Autoionization of Be-like ions following double electron capture in C sup 4+ , O sup 6+ and Ne sup 8+ ions (open access)

Autoionization of Be-like ions following double electron capture in C sup 4+ , O sup 6+ and Ne sup 8+ ions

This paper describes electron emission following the autoionization of doubly excited states in Be-like ions. The Be-like Auger states are produced by two electron capture in slow C{sup 4+}, O{sup 6+} and Ne{sup 8+} ions. These measurements were performed by means of high resolution Auger electron spectroscopy on different target gases and at different projectile energies. Line assignments and relative cross sections are given for the investigated doubly excited states and the excitation mechanism is discussed. 15 refs., 16 figs., 4 tabs.
Date: September 11, 1990
Creator: McDonald, J.W.
Object Type: Report
System: The UNT Digital Library
LHC IRQ cryostat support mechanical performance (open access)

LHC IRQ cryostat support mechanical performance

The LHC Interaction Region Quadrupoles (IRQ) will be shipped from Fermilab to CERN. The IRQ magnets are supported by glass fiber supports. A prototype cryostat support has been tested under various mechanical forces in order to check its mechanical behavior. These measurements have been made in order to validate a numerical model. A large range of mechanical loads simulates loads due to the shipment of the device, the weight of the cold mass as well as the cool down conditions. Its mechanical properties are measured by means of a dedicated arrangement operating at room temperature. This study appears to be essential to optimize the design of the support. The purpose of this note is to summarize the first measurements related to mechanical tests performed with the support.
Date: October 11, 1999
Creator: Darve, Ch.
Object Type: Report
System: The UNT Digital Library
Calculation of emission and absorption spectra of LTE plasma by the STA (Super Transition Array) method (open access)

Calculation of emission and absorption spectra of LTE plasma by the STA (Super Transition Array) method

Recent improvements in the Super Transition Array (STA) method for calculating Bound-Bound (BB) and Bound-Free (BF) emission and absorption spectra for LTE plasma are described and illustrated. The method accounts for all possible BB and BF radiative transitions in the plasma. Full detailed first order quantum relativistic treatment is used for calculating transition energies and probabilities. The enormous number of configurations are divided into sets of superconfigurations comprised of a collection of energetically grouped configurations. The contribution of the transition array between two superconfigurations to a specific one-electron transition is then represented by a Gaussian whose moments are calculated accurately using a technique that bypasses the necessity of direct summation over all the levels involved. The calculation of these moments involves the populations of the configurations given by their statistical weights and the Boltzmann factor. For each configuration within the super configuration we use zeroeth order energies in the Boltzmann factor corrected by a super configuration averaged first order term. The structure of the spectrum is increasingly revealed by splitting each STA into a number of smaller STAs. When the spectrum converges it describes the detailed UTA' structure, where each configuration-to-configuration array is represented by a separate Gaussian with first …
Date: January 11, 1991
Creator: Bar-Shalon, A.; Oreg, J. (Israel Atomic Energy Commission, Beersheba (Israel). Nuclear Research Center-Negev) & Goldstein, W.H. (Lawrence Livermore National Lab., CA (USA))
Object Type: Article
System: The UNT Digital Library
The Flux and Recovery of Bioactive Substances in the Surface Sediments of Deep Basins Off Southern California (open access)

The Flux and Recovery of Bioactive Substances in the Surface Sediments of Deep Basins Off Southern California

Sediment microbial community biomass and activity in Santa Monica Basin, a nearshore basin in the California Continental Borderland, were examined in October 1985, 1986 and 1987, May 1986, April 1987 and January 1990. Millimeter-scale ATP profiles and incubation of intact cores with {sup 3}H-adenine indicated a high-biomass interface microbial population in the low-oxygen central basin, which was absent in samples from the basin slope sediments. A majority of microbial activity and organic matter mineralization occurred in the top cm of sediment. Comparison of measured ATP and total organic carbon profiles suggest that the C:ATP ratio (wt:wt) ranges between 47:1 and 77:1 in central basin interfacial populations, substantially lower than reported for other aquatic environments. Carbon production estimated from DNA synthesis measurements via {sup 3}H-adenine incorporation was compared with TCO{sub 2} fluxes measured by in situ benthic chamber experiments. Within the uncertainty of the C:ATP ratio, an overall microbial carbon assimilation efficiency of 75--90% was indicated. The low C:ATP ratios and high carbon assimilation efficiencies significantly affect estimates of microbial growth and respiration and are substantially different than those often assumed in the literature. These results suggest that without independent knowledge of these ratios, the uncertainty in tracer-derived microbial growth and …
Date: June 11, 1990
Creator: Jahnke, R. A.
Object Type: Report
System: The UNT Digital Library
Liquid Phase Methanol LaPorte Process Development Unit: Modification, Operation, and Support Studies (open access)

Liquid Phase Methanol LaPorte Process Development Unit: Modification, Operation, and Support Studies

The objectives of the present work can be divided into three parts. The first objective was to develop a best-fit model for the older methanol synthesis catalyst (BASF S3-85) data base. At the time that this work commenced (June 1989), the BASF S3-85 data base contained many rate measurements accumulated over a few years. The newer catalyst (BASF S3-86) data base, at that time, contained only a few observations and did not include a broad range of conditions. Thus, a second objective of this work was to expand the BASF S3-86 data base to include more rate observations over a broader range of conditions. Finally, after expansion of the BASF S3-86 data base, the third objective was to develop a rate expression to describe this data base. This would include the application of rate expressions developed for the BASF S3-85 catalyst, as well as new models. (VC)
Date: March 11, 1991
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Supersymmetry breaking from superstrings and the gauge hierarchy (open access)

Supersymmetry breaking from superstrings and the gauge hierarchy

The gauge hierarchy problem is reviewed and a class of effective field theories obtained from superstrings is described. These are characterized by a classical symmetry, related to the space-time duality of string theory, that is responsible for the suppression of observable supersymmetry breaking effects. At the quantum level, the symmetry is broken by anomalies that provide the seed of observable supersymmetry breaking, and an acceptably large gauge hierarchy may be generated. 39 refs.
Date: July 11, 1990
Creator: Gaillard, M.K. (Lawrence Berkeley Lab., CA (USA) California Univ., Berkeley, CA (USA). Dept. of Physics)
Object Type: Article
System: The UNT Digital Library
Structural analysis of the P reactor at the Savannah River Site (open access)

Structural analysis of the P reactor at the Savannah River Site

A seismic analysis of the P-reactor buildings that were built in the early 1950's has been performed using current criteria and analysis techniques. The seismic input is based on the RG 1.60 free field response spectra anchored at 0.2g ZPA. The SSI analysis applied deconvolution techniques to establish soil parameters based on strain dependent damping and shear modulus relationships. The analysis used 2-dimensional soil structure interaction techniques to generate floor response spectra. The spectra were adjusted to account for torsional amplifications resulting from differences between the locations of the center of mass of the floors and the center of rigidity of the connecting vertical column elements. The resulting floor response spectra were smoothed and broadened in accordance with NRC criteria. In addition to developing floor response spectra, building shears and moments were obtained and an assessment of the structural capacity of the buildings to withstand the seismic loads was made.
Date: April 11, 1991
Creator: Zaslawsky, M. & Maryak, M.
Object Type: Article
System: The UNT Digital Library
ITER edge-plasma conditions versus pump configuration (open access)

ITER edge-plasma conditions versus pump configuration

Two-dimensional fluid simulations of ITER double-null divertor scrape-off-layer plasma conditions have been restricted to examining a single outboard divertor plate with up/down symmetry assumed. The present work evaluates the effect of pumping at only one plate on particle flow patterns and other parameters of interest. Pumping only at one plate results in reduced sheath temperatures at both plates but an increased heat flux at the pumped plate. The physics assumptions for separatrix density (n{sub SEP}={l angle}n{r angle}/3.5) and for radial particle diffusivity (D=0.66m{sup 2}/s) used in the simulation of ITER edge plasma result in particle throughputs two orders of magnitude greater than that required for acceptable fusion-product ash removal rates. The particle confinement time, however, is an order of magnitude shorter than the transport energy confinement time, {tau}{sub E}. Plasmas (D=0.04m{sup 2}/s) which would have {tau}{sub p} {approximately} {tau}{sub E} are evaluated and found to have unacceptably high plasma temperatures and heat flux at the plate. Ash removal rates are still acceptable. A plasma recycle coefficient of R=0.965 reduces the particle throughput by a factor of 2.8 below the no-recycle case.
Date: December 11, 1991
Creator: Werley, K.A. & Cohen, S.A. (Los Alamos National Lab., NM (United States) Princeton Univ., NJ (United States). Plasma Physics Lab.)
Object Type: Article
System: The UNT Digital Library
Vertex detection at the Tevatron (open access)

Vertex detection at the Tevatron

Addition of vertex detectors to CDF and D0 will facilitate a rich program of beauty physics at the Tevatron, and may enable tags of B and {tau} which facilitate searches for top and other heavy objects. We also address the operational considerations of triggering and radiation protection, and speculate on possible directions for upgrades. 9 refs., 7 figs.
Date: January 11, 1991
Creator: Amidei, D. (Michigan Univ., Ann Arbor, MI (USA)); Shepard, P. (Pittsburgh Univ., PA (USA)) & Tkaczyk, S. (Fermi National Accelerator Lab., Batavia, IL (USA))
Object Type: Article
System: The UNT Digital Library
Study of vector boson decay and determination of the Standard Model parameters at hadronic colliders (open access)

Study of vector boson decay and determination of the Standard Model parameters at hadronic colliders

The power of the detectors and the datasets at hadronic colliders begins to allow measurement of the electroweak parameters with a precision that confronts the perturbative corrections to the theory. Recent measurements of M{sub z}, M{sub w}, and sin {theta}{sub w} by CDF and UA2 are reviewed, with some emphasis on how experimental precision is achieved, and some discussion of the import for the specifications of the Standard Model. 14 refs., 10 figs., 4 tabs.
Date: January 11, 1991
Creator: Amidei, D.
Object Type: Article
System: The UNT Digital Library
Waste drum gas generation sampling program at Rocky Flats during FY 1988 (open access)

Waste drum gas generation sampling program at Rocky Flats during FY 1988

Rocky Flats Plant Transuranic Waste Drums were sampled for gas composition. Combustibles, plastics, Raschig rings, solidified organic sludge, and solidified inorganic sludge transuranic waste forms were sampled. Plastic bag material and waste samples were also taken from some solidified sludge waste drums. A vacuum system was used to sample each layer of containment inside a waste drum, including individual waste bags. G values (gas generation) were calculated for the waste drums. Analytical results indicate that very low concentrations of potentially flammable or corrosive gas mixtures will be found in vented drums. G(H{sub 2}) was usually below 1.6, while G(Total) was below 4.0. Hydrogen permeability tests on different types of plastic waste bags used at Rocky Flats were also conducted. Polyvinylchloride was slightly more permeable to hydrogen than polyethylene for new or creased material. Permeability of aged material to hydrogen was slightly higher than for new material. Solidified organic and inorganic sludges were sampled for volatile organics. The analytical results from two drums of solidified organic sludges showed concentrations were above detection limits for four of the 36 volatile organics analyzed. The analytical results for four of the five solidified inorganic sludges show that concentrations were below detection limits for all …
Date: February 11, 1991
Creator: Roggenthen, D. K.; McFeeters, T. L. & Nieweg, R. G.
Object Type: Report
System: The UNT Digital Library
A multilevel preconditioner for domain decomposition boundary systems (open access)

A multilevel preconditioner for domain decomposition boundary systems

In this note, we consider multilevel preconditioning of the reduced boundary systems which arise in non-overlapping domain decomposition methods. It will be shown that the resulting preconditioned systems have condition numbers which be bounded in the case of multilevel spaces on the whole domain and grow at most proportional to the number of levels in the case of multilevel boundary spaces without multilevel extensions into the interior.
Date: December 11, 1991
Creator: Bramble, J.H.; Pasciak, J.E. & Xu, Jinchao.
Object Type: Article
System: The UNT Digital Library
Systematic investigation of electron impact excitation-autoionization from the groud state of highly charged GaI-like ions through. Delta. N=1 transitions (open access)

Systematic investigation of electron impact excitation-autoionization from the groud state of highly charged GaI-like ions through. Delta. N=1 transitions

A systematic variation in the line intensity ratios of GaI-like and ZnI-like ions of rare earth elements has been recently observed in spectra emitted in a low density, high temperature tokamak plasma. This variation is shown to be correlated with the gradual opening of autoionizing channels through inner-shell excited configurations of the GaI-like charge-state. These channels enhance the indirect ionization rate of GaI-like ions through excitation-autoionization (EA), effecting the ionization balance and temperatures of greatest abundance. We present a systematic investigation of EA and direct impact ionization (DI) in the GaI-like isoelectronic sequence from Mo (Z = 42) to Dy (Z = 66). As Z decreases from Dy to Pr (Z = 59) the levels of the configuration 3d{sup 9}4p4f, which are excited from the ground state by strong dipole collisional transitions, gradually cross the first ionization limit of the ion and are responsible for this ionization enhancement. When Z decreases further an additional channel is opened through the configuration 3d{sup 9}4p4d. 9 refs., 3 figs., 1 tab.
Date: January 11, 1991
Creator: Oreg, J.; Bar-Shalom, A. (Israel Atomic Energy Commission, Beersheba (Israel). Nuclear Research Center-Negev); Goldstein, W.H. (Lawrence Livermore National Lab., CA (USA)); Mandlebaum, P.; Mittnik, D.; Meroz, E. et al.
Object Type: Article
System: The UNT Digital Library
Lectures on accelerator physics (open access)

Lectures on accelerator physics

This report contains lecture notes on beam dynamics and acceleration concepts in particle accelerators. (LSP)
Date: March 11, 1991
Creator: Luccio, A.
Object Type: Article
System: The UNT Digital Library
An ESME update (v. 7. 2) (open access)

An ESME update (v. 7. 2)

The program ESME for modeling the longitudinal degree of freedom of beam dynamics in proton synchrotrons was described in considerable detail in User's Guide to ESME v. 7.1'' distributed about a year ago. This note corrects minor errors and omissions in the User's Guide, discusses bugs and crochets, notes fixes, and reports a few enhancements. Current work and plans are sketched. This note should be adequate to update the User's Guide. 8 refs.
Date: February 11, 1991
Creator: MacLachlan, J.A.
Object Type: Report
System: The UNT Digital Library