15 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Silicon Oxides"  
Results: 1 - 15
open access

Measurements of the dependence of damage thresholds on laser wavelength, pulse duration and film thickness

Description: Results of three experiments will be described. We used 351-nm and 355-nm pulses with durations of 0.6, 1, 5 and 9 ns measure thresholds for a variety of anti-reflectance and high reflectance coatings. The functional form t/sup m/, with t the pulse duration, was used to scale fluence thresholds measured at 0.6 ns to those measured at 9.0 ns. Values of the coefficient m ranged from 0.10 to 0.51. The average value was 0.30. In the second experiment, we measured thresholds at 1064 nm, 527 nm and 3… more
Date: March 1, 1984
Creator: Rainer, F.; Vercimak, C.L.; Milam, D.; Carniglia, C.K. & Tuttle Hart, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Model of gypsum, calcite and silica solubilities for application to geothermal waters over a wide range of temperature, P/sub CO/sub 2// and ionic strength. Final technical report, October 1, 1983-September 30, 1984

Description: This report describes the construction of a high temperature (25 to 250/sup 0/C), variable P/sub CO/sub 2// (1 to 40 atm), chemical model of mineral (including gypsum, calcite and amorphous silica) solubilities in the system: Na-K-Ca-H-Cl-SO/sub 4/-HCO/sub 3/-CO/sub 3/-CO/sub 2/-SiO/sub 2/-H/sub 2/O. This model was designed to support geothermal energy production needs.
Date: January 1, 1984
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mass transfer in a geologic environment

Description: A new analytical solution is presented that predicts the rate of dissolution of species from a waste package surrounded by a wet porous medium. By equating the rate of diffusive mass transfer into the porous rock to the rate of liquid-surface chemical reaction, an analytical solution for the time-dependent dissolution rate and the time-dependent concentration of dissolved species at the waste surface is obtained. From these results it is shown that for most of the important species in a package… more
Date: November 1, 1984
Creator: Zavoshy, S. J.; Chambre, P. L. & Pigford, T. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Angular dependence of multilayer-reflector damage thresholds

Description: The damage resistance of HfO/sub 2//SiO/sub 2/ multilayer dielectric reflectors was measured as a function of angle of incidence with 351-nm XeF-laser irradiation. The laser produced nominal 10-ns pulses at a repetition rate of 35 pps. A series of reflectors designed for 0/sup 0/, 30/sup 0/, 45/sup 0/, 60/sup 0/, 75/sup 0/, and 85/sup 0/ was tested with an S-plane polarized beam. To account for variations in the separate coating depositions, some of the coating designs were tested at two angles… more
Date: January 1, 1984
Creator: Newnam, B. E.; Foltyn, S. R.; Gill, D. H. & Jolin, L. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Geothermal injection treatment: process chemistry, field experiences, and design options

Description: The successful development of geothermal reservoirs to generate electric power will require the injection disposal of approximately 700,000 gal/h (2.6 x 10/sup 6/ 1/h) of heat-depleted brine for every 50,000 kW of generating capacity. To maintain injectability, the spent brine must be compatible with the receiving formation. The factors that influence this brine/formation compatibility and tests to quantify them are discussed in this report. Some form of treatment will be necessary prior to inj… more
Date: September 1, 1984
Creator: Kindle, C. H.; Mercer, B. W.; Elmore, R. P.; Blair, S. C. & Myers, D. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Lung cancer in rats exposed to fibrogenic dusts

Description: Fischer-344 rats were exposed to quartz dusts and to quartz-bearing oil shale dusts in long-term inhalation studies. Aerosol concentrations of 12 mg/m/sup 3/ and 152-176 mg/m/sup 3/ for quartz and shale dusts, respectively, were used in exposure regimens lasting up to two years. Pulmonary fibrosis was observed in most animals surviving beyond 400 days. Adenocarcinomas and epidermoid carcinomas of the lung were observed in animals from all exposure groups, including those exposed to quartz alone… more
Date: January 1, 1984
Creator: Holland, L. M.; Wilson, J. S.; Tillery, M. I. & Smith, D. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Catalysis in biomass gasification

Description: The objective of these studies is to evaluate the technical and economic feasibility of producing specific gas products by catalytic gasification of biomass. Catalyst performance is a key factor in the feasibility of catalytic gasification processes. The results of studies designed to gain a fundamental understanding of catalytic mechanisms and causes of deactivation, and discussion of the state-of-the-art of related catalytic processes are presented. Experiments with primary and secondary cata… more
Date: June 1, 1984
Creator: Baker, E.G. & Mudge, L.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cerenkov detector for heavy-ion velocity measurements

Description: We have developed a highly sensitive velocity measuring detector using total-internal-reflection Cerenkov counters of a type mentioned by Jelly in 1958. If the velocity of the particle is above the threshold for total-internal-reflection these counters have a charge resolution of sigma = 0.18e for a 3mm thick glass radiator. For the velocity measurement we use a fused silica radiator so that the velocity of the particles are near the threshold for total-internal reflection. For momentum-analyze… more
Date: August 1, 1984
Creator: Olson, D. L.; Baumgartner, M.; Dufour, J. P.; Girard, J. G.; Greiner, D. E.; Lindstrom, P. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Blanket materials for fusion reactors: comparisons of thermochemical performance

Description: Thermodynamic calculations have been made to predict the thermochemical performance of the fusion reactor breeder materials, Li/sub 2/O, LiAlO/sub 2/, and Li/sub 4/SiO/sub 4/ in the temperature range 900 to 1300/sup 0/K and in the oxygen activity range 10/sup -25/ to 10/sup -5/. Except for a portion of these ranges, the performance of LiAlO/sub 2/ is predicted to be better than that of Li/sub 2/O and Li/sub 4/SiO/sub 4/. The protium purge technique for enhancing tritium release is explored for … more
Date: January 1, 1984
Creator: Johnson, C. E.; Fischer, A. K. & Tetenbaum, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Gamma-Ray to Cerenkov-Light Conversion Efficiency for Pure-Silica-Core Optical Fibers

Description: We have determined experimentally the absolute gamma-ray to Cerenkov-light conversion efficiency for pure-silica-core optical fibers in the vicinity of metallic Compton-converter slabs. To measure the energy dependence of this process, we used /sup 60/Co and /sup 24/Na radiation sources. The results show how the conversion efficiency varies with Compton-converter material, thickness, angle of the fiber, and fiber-converter distance. We also performed computer calculations of conversion efficien… more
Date: July 1, 1984
Creator: Pruett, B. L.; Peterson, R. T.; Smith, D. E.; Looney, L. D. & Shelton, R. N., Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Wide spectrum antireflective coating for laser fusion systems. Final report

Description: A method of depositing a laser damage resistant, wide-spectrum antireflective coating on fused silica has been developed. This work was sponsored under a subcontract with the University of California, with technical direction from the Lawrence Livermore National Laboratory. The coating is applied from a specific silanol polymer solution and converted to a porous SiO/sub 2/ film. The pore size of the film is first reduced by a heat treatment to prevent uv scattering. Then gradation of the pore v… more
Date: January 13, 1984
Creator: Yoldas, B.E; Partlow, D.P.; Smith, H.D. & Mattox, D.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Coated silica shells: an advanced hydrogen storage system

Description: We have investigated a new concept for the storage of hydrogen gas. It consists of storing hydrogen on a bed of small metal-coated spherical shells of nearly pure silica composition. The silica shells function as high pressure containers which because of silica's high strength, can withstand the pressures required to achieve significant gas storage densities. Since pure silica is too permeable to adequately retain hydrogen, a metal (e.g., Ni, Cu, Mo) coating is added as a room temperature perme… more
Date: January 1, 1984
Creator: Henderson, T.M. & Martin, A.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Thermodynamics of Li/sub 2/O and other breeders for fusion reactors

Description: Thermodynamic calculations have been made to compare the thermochemical performance of the fusion reactor breeder blanket materials, Li/sub 2/O, LiAlO/sub 2/, and Li/sub 4/SiO/sub 4/ in the temperature range 900 to 1300K and in the oxygen activity range 10/sup -25/ to 10/sup -5/. In general, LiAlO/sub 2/ offers advantages over Li/sub 2/O, and Li/sub 2/O in turn appears better than Li/sub 4/SiO/sub 4/. The protium purge technique of enhancing tritium release is explored for the LiAlO/sub 2/ syst… more
Date: December 3, 1984
Creator: Fischer, A. K. & Johnson, C. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Changes in permeability and fluid chemistry of the Topopah Spring Member of the Paintbrush tuff (Nevada Test Site) when held in a temperature gradient: summary of results

Description: The permeability and groundwater chemistry results for the Topopah Spring Member are reported and compared with the results from the previous work on Bullfrog. Permeability measurements made on samples of the Topopah Spring Member of the Paintbrush Tuff at room-temperature and in a temperature gradient show that the initially high (3-65 {mu}da) permeabilities are little affected by heating to at least 150{sup 0}C. These permeability relationships are favvorable for the disposal of nuclear waste… more
Date: June 1, 1984
Creator: Moore, D. E.; Morrow, C. A. & Byerlee, J. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Reaction of the Topopah Spring Tuff with J-13 water at 120{sup 0}C

Description: This report describes a series of hydrothermal experiments using crushed tuff from the Topopah Spring Member and natural ground water from well J-13. The purpose of these experiments is to define the changes in water chemistry that would result from temperature changes caused by emplacing high-level nuclear waste in a repository in the Topopah Spring tuff. Experiments were conducted at 120{sup 0}C in Teflon-lined reaction vessels at four separate rock-to-water ratios and for reaction times up t… more
Date: July 18, 1984
Creator: Oversby, V.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen