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CONTRIBUTION OF THE JOMINY-TYPE END QUENCH TO METALLOGRAPHIC PHASE IDENTIFICATION IN URANIUM

Description: The identification of phases and interpretation of phase transformation through microstructural analysis are still difficult even with metallographic standards as a guide. Macrostructures provide a better guide to determination of the origin of the quenched phase and the degree of quenching. Grain sizes are of some assistance in determining the cooling conditions employed. Twinning concentration and grain boundry shape are inconclusive characteristrcs to use in determining the origin of the que… more
Date: December 1, 1958
Creator: Lewis, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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{sup 99}Tc bioassay by inductively coupled plasma mass spectrometry (ICP-MS)

Description: A means of analyzing {sup 99}Tc in urine by inductively coupled plasma mass spectrometry (ICP-MS) has been developed. Historically, {sup 99}Tc analysis was based on the radiometric detection of the 293 keV E{sub Max} beta decay product by liquid scintillation or gas flow proportional counting. In a urine matrix, the analysis of{sup 99}Tc is plagued with many difficulties using conventional radiometric methods. Difficulties originate during chemical separation due to the volatile nature of Tc{su… more
Date: May 1, 1998
Creator: Lewis, L. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Analysis of Salinity in Streams of the Green River Basin

Description: Abstract: Dissolved-solids concentrations and loads can be estimated from streamflow records using a regression model derived from chemical analyses of monthly samples. The model takes seasonal effects into account by the inclusion of simple-harmonic time functions. Monthly mean dissolved-solids loads simulated for a 6-year period at U.S. Geological Survey water-quality stations in the Green River Basin of Wyoming agree closely with corresponding loads estimated from daily specific-conductance … more
Date: October 1977
Creator: DeLong, Lewis L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chemical logging of geothermal wells

Description: The determination of the change in chemical composition of the diluted drill fluid and its separation from the chemical background contributed by the drill fluid, drill mud, and other aquifer leakage is the essence of the chemical log. Samples of the drill fluid were collected for chemical analysis at certain times during the drilling operations. The chemical logging study of the geothermal wells is described. (MHR)
Date: April 1, 1979
Creator: McAtee, R. E.; Allen, C. A. & Lewis, L. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nucelar reactor seismic safety analysis techniques

Description: In order to provide insights into the seismic safety requirements for nuclear power plants, a probabilistic based systems model and computational procedure have been developed. This model and computational procedure will be used to identify where data and modeling uncertainties need to be decreased by studying the effect of these uncertainties on the probability of radioactive release and the probability of failure of various structures, systems, and components. From the estimates of failure an… more
Date: April 1, 1979
Creator: Cummings, G. E.; Wells, J. E. & Lewis, L. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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EFFECT OF TRANSFER TIME ON THE RECRYSTALLIZATION BEHAVIOR OF BETA-COOLED URANIUM

Description: A study was made of the recrystallization behavior of beta-quenched uranium by incorporating the effects of transfer time from the beta heat-treating bath to the quench media. A critical transfer lime which relates to the time required to immerse samples at a temperature above the beta-alpha transformation in a quench media directly affects the beta-cooled structure and its ease of recrystallization upon alpha phase annealing. Within the critical transfer time, the ease of recrystallization and… more
Date: January 12, 1959
Creator: Carloni, Q. C. & Lewis, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

OTEC performance tests of the Carnegie-Mellon University vertical fluted-tube condenser

Description: Results of performance tests on a vertical fluted-tube condenser designed by Carnegie-Mellon University are reported. The condenser was free of operational problems and performed in a stable and repeatable manner. At nominal design conditions (a heat duty of 3.2 million Btu/hr and a water flow rate of 3200 gpm), the overall heat transfer coefficient (U/sub 0/) was 1040 Btu/hr.ft/sup 2/./sup 0/F and the water-side pressure drop was 3.3 psi. Varying the quality of the ammonia vapor feed to the co… more
Date: May 1, 1979
Creator: Lewis, L G & Sather, N F
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

OTEC performance tests of the Union Carbide flooded-bundle evaporator

Description: Results of performance tests conducted on a Union Carbide flooded-bundle evaporator with High Flux titanium tubes are reported. At design operating conditions (a heat duty of 3.2 million Btu/hr, an inlet water temperature of 80/sup 0/F, and a water flow rate of 3200 gpm) the steady-state value of the overall heat transfer coefficient (U/sub 0/) was found to be 785 Btu/hr ft/sup 2/ /sup 0/F, and the ammonia-side and water-side heat transfer coefficients were 4800 and 1400 Btu/hr ft/sup 2/ /sup 0… more
Date: December 1, 1978
Creator: Lewis, L G & Sather, N F
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Crystallographic texture determinations from inverse susceptibility measurements

Description: Determination of the quantitative relationship between crystallographic texture and magnetic properties in advanced permanent magnets may be hampered by complex microstructures, which complicate methods that rely on diffraction, or by interparticulate interactions, which adversely affect methods based on magnetic remanence measurements. To this end, new techniques in the determination of texture of bulk permanent magnets are being explored to overcome these inherent experimental difficulties. T… more
Date: October 1, 1996
Creator: Lewis, L.H. & Welch, D.O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

On integrating modeling software for application to total-system performance assessment

Description: We examine the processes and methods used to facilitate collaboration in software development between two organizations at separate locations -- Lawrence Livermore National Laboratory (LLNL) in California and Sandia National Laboratories (SNL) in New Mexico. Our software development process integrated the efforts of these two laboratories. Software developed at LLNL to model corrosion and failure of waste packages and subsequent releases of radionuclides was incorporated as a source term into S… more
Date: May 1, 1994
Creator: Lewis, L. C. & Wilson, M. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Neutron chopper development at LANSCE

Description: Progress is reported on neutron chopper systems for the Los Alamos Neutron Scattering Center pulsed spallation neutron source. This includes the development of 600+ Hz active magnetic bearing neutron chopper and a high speed control system designed to operate with the Proton Storage Ring to phase the chopper to the neutron source. 5 refs., 3 figs.
Date: January 1, 1985
Creator: Nutter, M.; Lewis, L.; Tepper, S.; Silver, R.N. & Heffner, R.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ferromagnetic grain boundary signature in die-upset RE-Fe-B magnets

Description: Previous nanostructural and nanocompositional studies performed on the boundaries of deformed grains in two die-upset rare earth magnets with bulk compositions Nd{sub 13.75}Fe{sub 80.25}B{sub 6}, and Pr{sub 13.75}Fe{sub 80.25}B{sub 6} indicate that the intergranular phase in many grain boundaries is enriched in iron relative to the bulk. Preliminary magnetic data are presented that provide further evidence that this grain boundary phase is indeed iron-rich, and in fact appears to be ferromagnet… more
Date: July 1, 1994
Creator: Henderson Lewis, L.; Zhu, Y. & Welch, D. O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Decontamination and decommissioning of the EBR-I complex. Topical report No. 3. NAK disposal pilot plant test

Description: Decontamination and decommissioning of the Experimental Breeder Reactor No. 1 (EBR-I) requires processing of the primary coolant, an eutectic solution of sodium and potassium (NaK), remaining in the EBR-I primary and secondary coolant systems. While developing design criteria for the NaK processing system, reasonable justification was provided for the development of a pilot test plant for field testing some of the process concepts and proposed hardware. The objective of this activity was to pro… more
Date: June 1, 1975
Creator: Commander, J C; Lewis, L & Hammer, R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

{open_quotes}Exchange-spring{close_quotes} Nd-Fe-B alloys: Investigations into reversal mechanisms and their temperature dependence

Description: In order to investigate factors affecting coercivity a series of two-phase Nd{sub 2}Fe{sub 14}B-based nanocomposite alloys with different excess iron concentrations were produced by melt-spinning methods. The constituent grain size was estimated by diffraction methods to be in the range of 150 {Angstrom} - 500 {Angstrom}, and room-temperature demagnetization curves verify that the alloys studied exhibit a modest remanence enhancement. Isothermal remanence magnetization (IRM) and dc-demagnetizat… more
Date: October 1, 1996
Creator: Lewis, L.H.; Welch, D.O. & Panchanathan, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Extrinsic Curie temperature and spin reorientation changes in Nd{sub 2}Fe{sub 14}B/{alpha}-Fe nanocomposites

Description: The Curie temperatures and spin reorientation temperatures of a series of four melt-spun nanocomposite materials comprised of Nd{sub 2}Fe{sub 1}4B and varying amounts of {alpha}-Fe were measured using independent techniques. The phase constitution and grain size was assessed with synchrotron x-ray diffraction; the Curie temperatures were measured by differential thermal analysis (DTA) and dc SQUID magnetometry in the temperature range 375 K {le} T {le} 800 K, whereas the spin reorientation tran… more
Date: May 1, 1998
Creator: Lewis, L.H. & Panchanathan, V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Reactions Involved in Fingerprint Development Using the Cyanoacrylate - Fuming Method

Description: The Learning Objective is to present the basic chemistry research findings to the forensic community regarding development of latent fingerprints using the cyanoacrylate fuming method. Chemical processes involved in the development of latent fingerprints using the cyanoacrylate fuming method have been studied, and will be presented. Two major types of latent prints have been investigated--clean (eccrine) and oily (sebaceous) prints. Scanning electron microscopy (SEM) was used as a tool for dete… more
Date: July 30, 2001
Creator: Lewis, L. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analysis of Dyes Extracted from Millimeter-Size Nylon Fibers by Micellar Electrokinetic Chromatography

Description: The Learning Objective is to present to the forensic community a potential qualitative/quantitative method for trace-fiber color comparisons using micellar electrokinetic chromatography (MEKC). Developing a means of analyzing extracted dye constituents from millimeter-size nylon fiber samples was the objective of this research initiative. Aside from ascertaining fiber type, color evaluation and source comparison of trace-fiber evidence plays a critical role in forensic-fiber examinations. Liter… more
Date: July 30, 2001
Creator: Lewis, L. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Annealing-induced property improvements in 2-14-1 powders produced by inert gas atomization

Description: The effects of vacuum annealing on the phase constitution and magnetic properties of various size fractions of 3 alloy compositions produced by Inert-gas atomization (IGA) are examined. Annealing results in the oxidation of properitectic {alpha}-Fe formed during cooling of the melt, producing considerable improvement in the hard magnetic properties of the powders largely via the removal of lower-anisotropy magnetic reversal regions.
Date: April 1, 1996
Creator: Lewis, L.H.; Sellers, C.H. & Panchanathan, V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Performance assessment model of a single waste package

Description: PANDORA-1.1 is a system model for the mobilization and release of radionuclides from a spent nuclear fuel disposal package. Earlier processes affecting release are represented by input tables. Several groundwater contact alternatives and spent fuel constituents lead to different release-rate behaviors and controlling parameters. Rate control is provided by a product of parameters from hydrology, design, and/or geochemistry/waste form interaction parameters. The program is designed to accommodat… more
Date: January 1, 1994
Creator: O`Connell, W. J.; Ueng, Tzou-Shin & Lewis, L. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Integrated mined-area reclamation and land use planning. Volume 3A. A case study of surface mining and reclamation planning: South Boulder Creek Park Project, Sand and Gravel Operations, Boulder, Colorado

Description: This case study details reclamation planning for the Flatiron Companies' South Boulder Creek Park Project in Boulder, Colorado. The site contains a deposit of high-quality sand and gravel considered to be one of the best and largest known deposits of aggregate materials in the Front Range area. The aggregate deposit is located in a highly visible site just off the Denver-Boulder Turnpike at the entrance to the city from Denver, and adjacent to a residential portion of the city. In order to… more
Date: February 1, 1977
Creator: Lewis, L R; Perry, A O & LaFevers, J R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Post-closure performance assessment of waste packages for the Yucca Mountain Project

Description: This report details a system model of some core features of the performance of waste packages for the permanent disposal of spent nuclear fuel at the Yucca Mountain Site. The model is realized in the prototype computer program PANDORA-1.1. The PANDORA system model links processes leading to possible release of radionuclides from the waste package. The PANDORA submodels are being developed for processes and conditions specific to this potential repository site, notably the comparatively dry loca… more
Date: October 1, 1993
Creator: O`Connell, W. J.; Ueng, T. S. & Lewis, L. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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