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Comparison of Millipore Particle Measurement Computer System (. pi. MC), wet sieve analysis and microscopy analysis (modified Zeiss analyzer) for particle characterization. Period covered: July--September 1975

Description: A comparative study of powder characteristics measured by the Millipore Particle Measurement Computer System (..pi..MC) versus wet sieve analysis and microscopy analysis was prompted by a need to replace the latter methods with a more automated system. With the present procedures followed in instrument operation and computation of the data, the results indicate the following problem areas with the ..pi..MC: (1) inconsistency in its measurements; (2) automatic chord measurements do not relate to… more
Date: January 1, 1975
Creator: Duncan, A. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of physico-chemical properties on metabolism of transuranium oxide aerosols inhaled by beagle dogs

Description: The oxides of four transuranium isotopes ($sup 238$Pu, $sup 239$Pu, $sup 241$Am, and $sup 244$Cm), prepared by identical methods of calcining the oxalate at 750$sup 0$C for two hours, had different physico-chemical properties. For all four oxides the density ranges from 9.8 to 11.4 g cm$sup -3$ and initial ultrafilterability (suspended fraction of activity less than 24 A) varied from 0.002 percent for $sup 239$PuO$sub 2$ to 2.24 percent for $sup 238$PuO$sub 2$. Dogs were exposed by nose-only te… more
Date: January 1, 1975
Creator: Craig, D. K.; Park, J. F. & Ryan, J. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Helium bubbles at grain boundaries of high-density $sup 238$PuO$sub 2$ shards

Description: Hydroxide- and oxalate-base $sup 238$PuO$sub 2$ shards that were sintered to high density at 1200 or 1600$sup 0$C and then aged for 6 months or more exhibited grain-boundary gas bubbles due to agglomeration of alpha-decay helium when heated to 1200$sup 0$C and above. Conditions for bubble formation depended markedly on shard microstructure; large-grained shards with few large residual sintering pores formed gas bubbles at lower temperatures than small- grained shards with many pores. This behav… more
Date: January 1, 1975
Creator: McDonell, W.R.; Sheenan, J.E. & Sisson, R.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Large superconducting coil fabrication development

Description: Toroidal fields for some fusion devices will be produced by an array of large superconducting coils. Their size, space limitation, and field requirements dictate that they be high performance coils. Once installed, accessibility for maintenance and repairs is severely restricted; therefore, good reliability is an obvious necessity. Sufficient coil fabrication will be undertaken to develop and test methods that are reliable, fast, and economical. Industrial participation will be encouraged from … more
Date: January 1, 1975
Creator: Brown, R. L.; Allred, E. L.; Anderson, W. C.; Burn, P. B.; Deaderick, R. I.; Henderson, G. M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Physical and chemical characteristics of plutonium in existing contaminated soils and sediments

Description: Plutonium from three sites was studied to provide information necessary in understanding its behavior and fate under prevailing conditions. Plutonium in soils from the Nevada Test Site (NTS) was predominantly associated (50 to 75 percent) with the coarse silt (53 to 20 $mu$m) fraction. The plutonium in samples from Oak Ridge National Laboratory (ORNL) and Mound Laboratory (ML) was predominantly in the clay size (less than 2 $mu$m). The solubility in citric acid was about 20 to 25 percent in the… more
Date: January 1, 1975
Creator: Tamura, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Stabilization of dyed and undyed bulk RDX, October--December 1975. [Storage at elevated temperatures]

Description: Particle characterization of dyed and undyed RDX stored at elevated temperatures for various durations has been completed. Gas adsorption and microscopy analysis were performed on various samples heat treated at 100, 120 and 140/sup 0/C for times up to 912 h. Particle size and surface area remained essentially constant: however, surface decomposition apparently occurred as indicated by particle color changes.
Date: January 1, 1975
Creator: Duncan, A. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Techniques for characterization of particulate matter: neutron activation analysis, x-ray photoelectron spectroscopy, scanning electron microscopy

Description: Three techniques for particulate matter analysis are discussed: (1) neutron activation, which is a method that samples the entire specimen, both surface and bulk; (2) electron spectroscopy for chemical analysis (ESCA), which samples particle surfaces only; and (3) scanning electron microscopy (SEM), which reveals particle size and morphology, and can be used to determine composition differences in individual particles. These three techniques can be combined to construct highly detailed characte… more
Date: January 1, 1975
Creator: Hulett, L.D.; Dale, J.M.; Emery, J.F.; Lyon, W.S. Jr. & Fulkerson, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effect of reactor size on the breeding economics of LMFBR blankets

Description: The effect of reactor size on the neutronic and economic performance of LMFBR blankets driven by radially-power-flattened cores has been investigated using both simple models and state-of-the-art computer methods. Reactor power ratings in the range 250 to 3000 MW(e) were considered. Correlations for economic breakeven and optimum irradiation times and blanket thicknesses have been developed for batch-irradiated blankets. It is shown that a given distance from the core-blanket interface the fiss… more
Date: February 1, 1975
Creator: Tagishi, A. & Driscoll, M. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Comparison of Some Characteristics and Attitudes of Self-Described Future Mothers versus Non-Mothers

Description: This study compared women with a highly positive interest in becoming mothers with women having little interest in having children,with respect to biographical data, childrearing attitudes, and personality characteristics. One hundred twenty-one undergraduate college women were administered a biographical questionnaire, the Parental Attitude Research Instrument, the Adjective Check List, and an attitude index designed to assess level of interest in having children. A statistical analysis reveal… more
Date: May 1975
Creator: Cofer, Jeanne
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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