54 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Quantitative Chemical Analysis"  
Results: 1 - 24 next
open access

Feasibility Studies of in-Situ Coal Gasification in the Warrior Coal Field. Quarterly Report

Description: Laboratory studies on a research combustor were used in an attempt to determine the length of oxidation and reduction zones. Unfortunately the buoyant effects of the heated gases caused the burn to proceed along the upper portion of the horizontal combustor. This made the interpretation of uncertain value. Methods of measuring the thermal conductivity and chemical reactivity of coke are discussed. A bibliography of the physical and chemical properties of coke is appended. (LTN)
Date: March 1, 1979
Creator: Douglas, George W. & McKinley, Marvin D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Feasibility Studies of in-Situ Coal Gasification in the Warrior Coal Field. Quarterly Report

Description: Because of high internal temperatures, the external temperature has no effect upon the reaction rate of coke particles with air for temperatures above 750/sup 0/K. Reactions could not be initiated below that temperature. Chemical reaction rate was not found to be a rate-controlling step: both extra-particle and intra-particle diffusion are important and limit the rate of oxidation. The observed values of k/sub c/, the extra-particle mass transfer coefficient were found to be in good agreement w… more
Date: June 1, 1979
Creator: Douglas, George W. & McKinley, Marvin D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Controlled cadmium telluride thin films for solar cell applications. Emerging materials systems for solar cell applications. Quarterly progress report No. 2, July 9-October 8, 1979

Description: Numerous cadmium telluride films with excess Cd or Te have been prepared by controlled rf sputtering technique and characterized. It is found that slight excess of Cd or Te affects the structure, as well as the electrical resistivity of the film, markedly. Ohmic contacts with fairly low contact resistance have been achieved on Cd-rich specimens.
Date: November 1, 1979
Creator: Vedam, K
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characteristics of American coals in relation to their conversion into clean energy fuels. Quarterly technical progress report, April-June 1978

Description: The Penn State Coal Sample Bank was expanded to include four new samples from southwestern Pennsylvania and four from eastern Kentucky. A total of 69 coal samples and 487 selected printouts of coal data were provided to the coal research community. The effects of low temperature oxidation on reducing the agglomerating properties of caking coals are being studied. A DuPont 942 Thermomechanical analyzer has been shown to be a valuable tool for quantifying swelling and softening parameters. In add… more
Date: January 1, 1979
Creator: Spackman, W.; Davis, A.; Walker, P. L.; Lovell, H. L.; Essenhigh, R. H.; Vastola, F. J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

CdSiAs/sub 2/ thin films for solar cell applications. Second quarter report, July 1, 1979-September 30, 1979. [CdSiAs/sub 2//CdS]

Description: Sputtered films have been formed with two improved composite (Si + CdAs/sub 2/) targets. Near stoichiometric and mechanically continuous CdSiAs/sub 2/ films have been formed on metal substrates. Films of this type will be used over the next reporting period for heterojunction formation. Evaporation studies related to CdAs/sub 2/ have been completed. Stoichiometric CdAs/sub 2/ films could not be formed by means of single-source evaporation of CdAs/sub 2/ bulk. Hence, this dual source approach (S… more
Date: October 1, 1979
Creator: Burton, L.C. & Slack, L.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chemistry and structure of coal derived asphaltenes and preasphaltenes. Interim report

Description: It is the objective of this project to isolate the asphaltene and preasphaltene fractions from coal liquids from a number of liquefaction processes. These processes consist of in general: catalytic hydrogenation, staged pyrolysis and solvent refining. The asphaltene fractions may be further separated by both gradient elution through column chromatography, and molecular size distribution through gel permeation chromatography. These coal-derived asphaltene and preashpaltene fractions will then be… more
Date: January 1, 1979
Creator: Yen, T. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Determination of nitrogen and oxygen in uranium metal by inert-gas fusion

Description: An improved analytical method has been developed using inert-gas fusion for determining the nitrogen and the oxygen contents of uranium metal. The analytical method is applicable to concentrations of nitrogen and oxygen ranging from 1 microgram per gram to 1000 micrograms per gram for each gas. In uranium metal, the limit of error for a single determination at the 95%-confidence level, at the 12-micrograms-per-gram-nitrogen level, is +-3 micrograms per gram nitrogen and, at the 20-micrograms-pe… more
Date: December 1, 1979
Creator: Carden, W.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

LASL analytical chemistry program for fissionable materials safeguards

Description: Gas-solid reactions at elevated temperature, used previously to convert uranium in refractory forms to species readily soluble in acid, are being applied to thorium materials. A microgram-sensitive spectrophotometric method was developed for determining uranium and the LASL Automated Spectrophotometer has been modified to use it. The instrument now is functional for determining milligram amounts of plutonium, and milligram and microgram amounts of uranium. Construction of an automated controlle… more
Date: January 1, 1979
Creator: Jackson, D. D. & Marsh, S. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Vitre-Graf coating on mullite. Low cost silican solar array project: large area silicon sheet task. Final report, December 14, 1977-June 13, 1979

Description: A technical and economic evaluation was made of a proprietary glass-like carbon glaze coating applied to mullite and graphite to be used either in thin-film silicon manufacture or in container ware applications. Preliminary evaluations had indicated that the glassy carbon coating reacts with molten silicon to form a silicon carbide reaction layer that may serve as a diffusion barrier to prevent silicon reaction with the substrate material. The technical evalution consisted of manufacturing test… more
Date: January 1, 1979
Creator: Rossi, R.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Determination of cadmium in solutions containing uranium, neptunium, and plutonium

Description: An analytical method was developed for determining cadmium in solutions containing fissionable materials and high alpha activities. The solutions were first extracted with 30% tributyl phosphate in dodecane to separate the actinide elements from the cadmium. This extraction step removed interfering ions and reduced the alpha activity. The cadmium concentrations were determined by atomic absorption analysis. The method has been applied to solutions containing 20 to 30 g Cd/liter, about 10 g Pu/l… more
Date: February 1, 1979
Creator: Gray, L.W.; Overman, L.A. & Hodgens, H.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simultaneous mass detection for direct inlet mass spectrometry

Description: The evolution of analytical techniques for application in trace analysis has led to interest in practical methods for real-time monitoring. Direct inlet mass spectrometry (DIMS) has been the subject of considerable activity in recent years. A DIMS instrument is described which consists of an inlet system designed to permit particles entrained in the inlet air stream to strike a hot, oxidized rhenium filament which serves as a surface ionization source. A mass analyzer and detection system then … more
Date: May 1, 1979
Creator: Gordon, R.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chemical analyses of waters from geysers, hot springs, and pools in Yellowstone National Park, Wyoming from 1974 to 1978

Description: Waters from geysers, hot springs, and pools of Yellowstone National Park have been analyzed. We report 422 complete major ion analyses from 330 different locations of geysers, hot springs, and pools, collected from 1974 to 1978. Many of the analyses from Upper, Midway, Lower, and Norris Geyser Basin are recollections of features previously reported.
Date: January 1, 1979
Creator: Thompson, J.M. & Yadav, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Determination of nitride nitrogen in irradiated materials

Description: A method for determining nitride nitrogen was adapted for analyses of irradiated samples in a hot cell. Sections of stainless steel cladding material or fuel are dissolved remotely using various combinations of H/sub 2/SO/sub 4/, HCl, and HF. The nitrogen is separated from the highly radioactive sample solution by steam distillation using the Kjeldahl method. The collected distillates are moved from the hot cell to an open-front box where they are treated with Nessler's reagents for spectrophot… more
Date: March 1, 1979
Creator: Maez, M.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurement of leached hulls

Description: Leached hulls are the short lengths of fuel rod cladding and fuel element hardware which constitute a major waste product of a reprocessing plant employing a chop-and-leach head-end process. The small, undissolved fuel residue (0.1 to 1.0% of original fuel content) which is discarded with this waste must be measured for safeguards, material accountability, and process control reasons. This report gives a critical analysis of hull measurement techniques involving the analysis of fission product … more
Date: July 1, 1979
Creator: Reilly, T. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analysis of natural waters with an automated inductively-coupled plasma spectrometer system

Description: A commercial ICP spectrometer system has been automated to provide unattended operation and data collection following initializing commands and loading of the sample changer. Automation is provided by a microcomputer which permits interconnection of a sample changer, a card reader, a high-speed printer terminal, a dual floppy disk drive, and the spectrometer's basic computer. Application of the system to the analysis of natural water samples is described. Accuracy and precision data both for sh… more
Date: January 1, 1979
Creator: Peck, E.S.; Langhorst, A.L. Jr. & O'Brien, D.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Rugged, remotely maintainable pipetter using microprocessor control

Description: At the Idaho Chemical Processing Plant (ICPP), the chemical analysis of future nuclear fuel reprocessing solutions will require improved analytical apparatus. Remote pipetters are crucial components in the analysis procedures. Major improvements required for a new pipetter were: greater accuracy for better accounting of fissile material, greater corrosion resistance to handle new fuel reprocessing schemes, and drastic reduction in contact maintenance to reduce personnel radiation exposure to as… more
Date: January 1, 1979
Creator: Dykes, F.W.; Shurtliff, R.M.; Henscheid, J.P. & Baldwin, J.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Non-destructive determination of trace-element concentrations. Annual progress report, August 1979

Description: Development and testing of the neutron-capture prompt ..gamma..-ray activation analysis method continued. A wide range of NBS Standard Reference Materials, USGS Standard Rocks, and other materials have been analyzed in order to identify elements whose lines can be observed, to determine interferences and detection limits for each important ..gamma.. ray of observable elements and to measure concentrations of observable elements for comparison with certified or other previous results. In most cr… more
Date: August 1, 1979
Creator: Gordon, G.E.; Zoller, W.H. & Walters, W.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analysis of soil samples from OMRE decommissioning project

Description: In order to establish that the present Organic Moderated Reactor Experiment (OMRE) site does not exceed the criteria for radioactive contamination, samples obtained from the remainder of the facility that was not removed such as soil, concrete pads, various structural materials, and the leach pond area were analyzed to determine their radioactive content. The results of the analyses performed on soil samples are presented. Results of this study indicate that the activity at the OMRE decommissio… more
Date: January 1, 1979
Creator: Simpson, O.D.; Chapin, J.A.; Hine, R.E.; Mandler, J.W.; Orme, M.P. & Soli, G.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Quality engineering and control. Semiannual progress report, May-October 1978

Description: The standard colorimetric procedure for thorium was improved by using lanthanum carrier precipitation of thorium fluoride, conversion to sulfate, and colorimetric measurement with thoron. Four types of anion-exchange resins were evaluated using breakthrough capacity, elution volume, and the neptunium-plutonium ratios in both wash solutions and ion-column eluates as criteria, and 100 to 200 mesh Dowex 1 x 4 resin had the most favorable separation characteristics. Use of commercially available aq… more
Date: August 20, 1979
Creator: Carpenter, R.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characteristics of American coals in relation to their conversion into clean energy fuels. Quarterly technical progress report, July-September 1978

Description: Certain important aspects of the chemical and physical composition of American lignite coals are being characterized. Differential scanning calorimetry and thermogravimetric analysis were used to study the interaction between oxygen and seventeen coal chars (40 x 100 mesh) at 100/sup 0/C. The same techniques were used to investigate briefly the interaction between air and a highly caking coal at selected isothermal temperatures in the range 100 to 275/sup 0/C.
Date: May 1, 1979
Creator: Spackman, W.; Davis, A.; Walker, P. L.; Lovell, H. L.; Vastola, F. J.; Given, P. H. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurement of plutonium and americium in molten salt residues

Description: The measurement of plutonium and americium in molten salt residues using a segmented gamma-ray scanning device is described. This system was calibrated using artificially fabricated as well as process generated samples. All samples were calorimetered and the americium to plutonium content of the samples determined by gamma-ray spectroscopy. For the nine samples calorimetered thus far, no significant biases are present in the comparison of the segmented gamma-ray assay and the calorimetric assay… more
Date: January 1, 1979
Creator: Haas, F. X.; Lawless, J. L.; Herren, W. E. & Hughes, M. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Determination of hydrogen in uranium-niobium-zirconium alloy by inert-gas fusion

Description: An improved method has been developed using inert-gas fusion for determining the hydrogen content in uranium-niobium-zirconium (U-7.5Nb-2.5Zr) alloy. The method is applicable to concentrations of hydrogen ranging from 1 to 250 micrograms per gram and may be adjusted for analysis of greater hydrogen concentrations. Hydrogen is determined using a hydrogen determinator. The limit of error for a single determination at the 95%-confidence level (at the 3.7-..mu..g/g-hydrogen level) is +-1.4 microgra… more
Date: December 1, 1979
Creator: Carden, W.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen