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1/2 Sintering of Mullite-Containing Materials: I. Effect of Composition

Description: Sintering behavior of mullite-containing powders was studied over a range of chemical compositions (Al{sub 2}O{sub 3}/SiO{sub 2} ratio). Densification measurements were made for both liquid phase-containing and solid state systems. Small amounts of liquid phase were observed to have a significant effect on densification rate. A linear relationship was obtained between the percent of theoretical density and the logarithm of time for compositions in the range 73-75 wt% Al{sub 2}O{sub 3}. Currentl… more
Date: December 1, 1981
Creator: Sacks, Michael D. & Pask, Joseph A.
Item Type: Refine your search to only Article
open access

2-D time evolution of T/sub e/ during sawtooth crash based on fast ECE (electron cyclotron emission) measurements on TFTR

Description: Electron cyclotron emission measurements taken at 20 locations in the horizontal midplane during a sawtooth crash have been analysed based on the assumption of fast rigid rotation of the plasma. Due to this fast rotation (approx.100..mu..sec), which remains fairly constant throughout the sawtooth crash, we have been able to make time-to-space reconstructions of half the poloidal plane using points which are separated in time by not more than 40..mu..sec. The existence of a temperature flattenin… more
Date: December 1, 1988
Creator: Kuo-Petravic, G.
Item Type: Refine your search to only Report
open access

2-Dimensional studies of the disk-and-washer and side-coupled resonant cavity structures

Description: The work done consists of three parts: optimizing the disk-and-washer (DAW) structure at ..beta.. = 0.5662 corresponding to E = 200 MeV; comparing the DAW structure with the side-coupled (SCS) structure at various values of beta, ranging from ..beta.. = 0.4569 and E = 116 MeV to ..beta.. = 0.7131 and E = 400 MeV; and re-optimizing the DAW structure at ..beta.. = 0.7131. 4 refs., 51 figs., 41 tabs.
Date: December 1, 1987
Creator: Larry, L.D. Jr.
Item Type: Refine your search to only Report
open access

3-D transient eddy current calculations for the FELIX cylinder experiments

Description: The three-dimensional eddy current transient field problem is formulated first using the U-V method. This method breaks the vector Helmholtz equation into two scalar Helmholtz equations. Null field integral equations and the appropriate boundary conditions are used to set up an identification matrix which is independent of null field point locations. Embedded in the identification matrix are the unknown eigenvalues of the problem representing its impulse response in time. These eigenvalues are … more
Date: December 1, 1986
Creator: Davey, K. R. & Turner, L. R.
Item Type: Refine your search to only Report
open access

20-kW Solar Photovoltaic Flat-Panel Power System for an Uninterruptible Power-System Load in El Paso, Texas. Phase Ii. System Fabrication. Final Report October 1, 1979-May 31, 1981

Description: The system plans, construction, integration and test, and performance evaluation are discussed for the photovoltaic power supply at the Newman Power Station in El Paso, Texas. The system consists of 64 parallel-connected panels, each panel containing nine series-connected photovoltaic modules. The system is connected, through power monitoring equipment, to an existing DC bus that supplies uninterruptible power to a computer that controls the power generating equipment. The site is described and… more
Date: December 1, 1981
Creator: Risser, V.V.
Item Type: Refine your search to only Report
open access

300 Area Process Trench Sediment Analysis Report

Description: This report describes the results of a sampling program for the sediments underlying the Process Trenches serving the 300 Area on the Hanford reservation. These Process Trenches were the subject of a Closure Plan submitted to the Washington State Department of Ecology and to the US Environmental Protection Agency in lieu of a Part B permit application on November 8, 1985. The closure plan described a proposed sampling plan for the underlying sediments and potential remedial actions to be determ… more
Date: December 1, 1987
Creator: Zimmerman, M.G. & Kossik, C.D.
Item Type: Refine your search to only Report
open access

850 J, 150 ns narrow-band krypton fluoride laser

Description: We report laser experiments on a 248 nm KrF laser with a 30x40x120 cm gain volume and an injection locked unstable resonator cavity. The volume is pumped by six 450 kV, 90 kA electron beam generators using water pulse forming lines.
Date: December 16, 1983
Creator: Goldhar, J.; Jancaitis, K. S.; Murray, J. R. & Schlitt, L. G.
Item Type: Refine your search to only Article
open access

1987 calibration of the TFTR neutron spectrometers

Description: The {sup 3}He neutron spectrometer used for measuring ion temperatures and the NE213 proton recoil spectrometer used for triton burnup measurements were absolutely calibrated with DT and DD neutron generators placed inside the TFTR vacuum vessel. The details of the detector response and calibration are presented. Comparisons are made to the neutron source strengths measured from other calibrated systems. 23 refs., 19 figs., 6 tabs.
Date: December 1, 1989
Creator: Barnes, C.W.; Strachan, J.D. (Los Alamos National Lab., NM (USA) & Princeton Univ., NJ (USA). Plasma Physics Lab.)
Item Type: Refine your search to only Report
open access

5MW Raft River Facility Experience

Description: Located in Northern California In Lake and Sonoma Counties about 90 miles north of San Francisco, Pacific Gas and Electric Company's (PG and E's) The Geysers Power Plant, which has at present fourteen units in service with a net generating capacity of 798MW, is the largest geothermal development in the world. Eight additional PG and E units now in construction, design, and planning will add 720MW of additional capacity by 1986. Figure 1 shows the location of this project and the locations of th… more
Date: December 1, 1980
Creator: Whitbeck, J.F.
Item Type: Refine your search to only Article
open access

Abandoned Texas oil fields

Description: Data for Texas abandoned oil fields were primarily derived from two sources: (1) Texas Railroad Commission (TRRC), and (2) Dwight's ENERGYDATA. For purposes of this report, abandoned oil fields are defined as those fields that had no production during 1977. The TRRC OILMASTER computer tapes were used to identify these abandoned oil fields. The tapes also provided data on formation depth, gravity of oil production, location (both district and county), discovery date, and the cumulative productio… more
Date: December 1, 1980
Item Type: Refine your search to only Report
open access

Absolute rate measurements of two-photon process of gases, liquids, and solids

Description: Due to rapid improvements in high-power laser performance, two-photon absorption processes have become a very useful tool for studying the molecular structures of various gases, liquids and solids. However, measurements of absolute two-photon absorption cross sections were more or less ignored previously because of their small size. In this work, we obtained not only the two-photon absorption spectra, but also measurements of their absolute cross sections for various gases, liquids, and solids.… more
Date: December 1, 1987
Creator: Chen, C.H.; McCann, M.P. & Payne, M.G.
Item Type: Refine your search to only Article
open access

Abundance and Distribution of Walleye, Northern Squawfish, and Smallmouth Bass in John Day Reservoir, 1984-1985 Progress Report.

Description: Sampling was conducted in John Day Reservoir to collect walleye, northern squawfish and smallmouth bass. Changes in distributions during sampling were characterized from changes in catch per unit effort (CPUE) in sampling areas. Observed movements of marked and radiotagged fish were examined and used to define discrete populations. Abundances were estimated using a modified Schnabel multiple mark and recapture estimator. Abundance estimates were corrected for angler harvest, size specific vulne… more
Date: December 1, 1985
Creator: Beamesderfer, Raymond C.
Item Type: Refine your search to only Report
open access

Accessibility of second regions of stability in tokamaks

Description: Second regions of stability to the ideal ballooning modes have been shown to exist in large-aspect-ratio circular and small-aspect-ratio bean-shaped tokamaks. We report on the existence of these second stability regions in finite-aspect-ratio dee-shaped tokamaks. We also report on the discovery of a second-stable region with respect to the n = 1 external kink mode in a bean-shaped plasma. The role of the shear and current profile in determining these regions of parameter space are discussed. 13… more
Date: December 1, 1985
Creator: Manickam, J.
Item Type: Refine your search to only Report
open access

Accumulated surface damage on ZnS crystals produced by closely spaced pairs of picosecond laser pulses

Description: Excitation of a transparent ZnS crystal by repetitive picosecond dye laser pulses causes an accumulated surface modification leading to optical damage. The onset of the damage is detected by an abrupt increase in the emission of neutral Zn (and possibly S/sub 2/) from the surface. Comparison of the neutral emission thresholds with pulse-pair and single-pulse excitation shows that linear absorption is the dominant laser-surface interaction. In general, this measurement technique shows considerab… more
Date: December 1, 1988
Creator: Chase, L. L. & Lee, H. W. H.
Item Type: Refine your search to only Article
open access

Achieving Technical Performance

Description: Originally, operating a license and protecting the environment were to be handled in separate workshops but since these two subjects are closely related they were combined. The workshop participants did, however, try to focus the discussion on the two separately, though we were not always successful. Fortunately, we had two people in our group who are intimately involved in licensing proceedings in the only two states that have considered geothermal power plants, California and New Mexico. Lavo… more
Date: December 1, 1980
Creator: Unitt, S.G.
Item Type: Refine your search to only Article
open access

Acid rain information book. Draft final report

Description: Acid rain is one of the most widely publicized environmental issues of the day. The potential consequences of increasingly widespread acid rain demand that this phenomenon be carefully evaluated. Reveiw of the literature shows a rapidly growing body of knowledge, but also reveals major gaps in understanding that need to be narrowed. This document discusses major aspects of the acid rain phenomenon, points out areas of uncertainty, and summarizes current and projected research by responsible gov… more
Date: December 1, 1980
Item Type: Refine your search to only Report
open access

Acoustic and electrical properties of Mexican geothermal rock samples

Description: Acoustic compressional and shear-wave velocities have been measured on a suite of ten sandstone samples obtained from wells in the Cerro Prieto geothermal field and on two rock samples from other Mexican geothermal fields. The samples were tested in both their dry and fully brine-saturated states at uniaxial stresses to 15 MPa. Electrical resistivities and associated phase angles have been measured on the same core samples as a function of frequency in the range 10 Hz to 10/sup 5/ Hz under drai… more
Date: December 1, 1984
Creator: Contreras, E. A. & King, M. S.
Item Type: Refine your search to only Article
open access

Acoustic microscopy with mixed-mode transducers

Description: The new amplitude-phase acoustic microscope is versatile; it operates in a wide frequency range 1--200 MHz, with selection of longitudinal, shear, and mixed modes. This enables it to be used in many NDE applications for different kinds of materials. Besides the application examples presented in this paper (bulk defect imaging of lossy materials or at deep locations; leads of IC chip in epoxy package; amplitude images of surface crack on Si nitride ball bearing; thin Au film on quartz), this sys… more
Date: December 31, 1988
Creator: Chou, C. H.; Parent, P. & Khuri-Yakub, B. T.
Item Type: Refine your search to only Article
open access

Acoustic resonances in cylinder bundles oscillating in a compressibile fluid

Description: This paper deals with an analytical study on acoustic resonances of elastic oscillations of a group of parallel, circular, thin cylinders in an unbounded volume of barotropic, compressible, inviscid fluid. The perturbed motion of the fluid is assumed due entirely to the flexural oscillations of the cylinders. The motion of the fluid disturbances is first formulated in a three-dimensional wave form and then casted into a two-dimensional Helmholtz equation for the harmonic motion in time and in a… more
Date: December 1, 1984
Creator: Lin, W. H. & Raptis, A. C.
Item Type: Refine your search to only Article
open access

Activation of methane by transition metal-substituted aluminophosphate molecular sieves

Description: Recent experiments in our laboratory have demonstrated that aluminophosphate molecular sieves substituted with cobalt and cobalt/silicon combinations and having the AlPO{sub 4}-34 or AlPO{sub 4}-5 structure activate methane starting at {approximately}350{degree}C. Between 400 and 500{degree}C the rate of methane conversion increases steadily with typical conversion efficiencies at 500{degree}C ranging from 15 to 60%. The cobalt and silicon substituted AlPO{sub 4}-34 structure (CoAPSO-34) produc… more
Date: December 1, 1989
Creator: Maroni, V A; Willms, K A; Nguyen, Hiephoa & Iton, L E
Item Type: Refine your search to only Article
open access

ACTIVE: a program to calculate and plot reaction rates from ANISN calculated fluxes

Description: The ACTIVE code calculates spatial heating rates, tritium production rates, neutron reaction rates, and energy spectra from particle fluxes calculated by ANISN. ACTIVE has a variety of input options including the capability to plot all calculated spatial distributions. The code was primarily designed for use with fusion first wall/blanket systems, but could be applied to any one-dimensional problem.
Date: December 1, 1981
Creator: Judd, J. L.
Item Type: Refine your search to only Report
open access

Active layer hydrology for Imnavait Creek, Toolik, Alaska. Annual progress report, July 1984--January 1986

Description: In the annual hydrologic cycle, snowmelt is the most significant event at Imnavait Creek located near Toolik Lake, Alaska. Precipitation that has accumulated for more than 6 months on the surface melts in a relatively short period of 7 to 10 days once sustained melting occurs. During the ablation period, runoff dominates the hydrologic cycle. Some meltwater goes to rewetting the organic soils in the active layer. The remainder is lost primarily because of evaporation, since transpiration is not… more
Date: December 31, 1986
Creator: Kane, D. L.
Item Type: Refine your search to only Report
open access

Activity and Diffusion of Metals in Binary Aluminum Alloys

Description: To determine the activity of zinc in Zn-Al alloys, the electromotive force (emf) of the cell: Zn/ZnCl/sub 2/-KC1 (eut)/Zn,Al was measured at temperatures between 569.5 K (296.5C) and 649.5 K (376.5C). The applicability of a two-suffix Margules equation was demonstrated, in good agreement with theoretical expectations. The diffusion coefficient of Zn in Al determined from a planar diffusion model for the experimental data was about 3 x 10/sup -10/ cm/sup 2//sec to 2 x 10/sup -9/ cm/sup 2//sec in… more
Date: December 1, 1980
Creator: Jao, Chiang Seng
Item Type: Refine your search to only Thesis or Dissertation
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