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A correlation between EIS and salt spray proof tests for the corrosion resistance of conversion coated aluminum alloys

Description: In this study, 33 different conversion coatings were applied to 5 different Al alloy substrates. Salt spray exposure testing and EIS (electrochemical impedance spectroscopy) were conducted for comparison. A relation was developed.
Date: September 1, 1996
Creator: Buchheit, R. G.; Martinez, M. A.; Cunningham, M.; Jensen, H. & Kendig, M. W.
Partner: UNT Libraries Government Documents Department
open access

A laser scanning system for metrology and viewing in ITER

Description: The construction and operation of a next-generation fusion reactor will require metrology to achieve and verify precise alignment of plasma-facing components and inspection in the reactor vessel. The system must be compatible with the vessel environment of high gamma radiation (10{sup 4} Gy/h), ultra-high-vacuum (10{sup {minus}8} torr), and elevated temperature (200 C). The high radiation requires that the system be remotely deployed. A coherent frequency modulated laser radar-based system will… more
Date: May 1, 1996
Creator: Spampinato, P. T.; Barry, R. E.; Menon, M. M.; Herndon, J. N.; Dagher, M. A. & Maslakowski, J. E.
Partner: UNT Libraries Government Documents Department
open access

Integrated wastewater management planning for DOE`s Rocky Flats Environmental Technology Site

Description: Rocky Mountain Remediation Services, L.L.C. (RMRS), jointly formed by Morrison Knudsen Corporation and BNFL Inc., provides international experience in the nuclear, environmental, waste management, decontamination and decommissioning (D&D) , and project management industry. The company is currently the environmental restoration, waste management, and D&D subcontractor for Kaiser-Hill Company at the Rocky Flats Environmental Technology Site (RFETS). RMRS offers unique solutions and state-of-the-a… more
Date: February 1, 1996
Creator: Hopkins, J.; Barthel, J.; Wheeler, M. & Conroy, K.
Partner: UNT Libraries Government Documents Department
open access

Solar power tower development: Recent experiences

Description: Recent experiences with the 10 MW{sub e} Solar Two and the 2.5 MW{sub t} TSA (Technology Program Solar Air Receiver) demonstration plants are reported. The heat transfer fluids used in these solar power towers are molten-nitrate salt and atmospheric air, respectively. Lessons learned and suggested technology improvements for next-generation plants are categorized according to subsystem. The next steps to be taken in the commercialization process for each these new power plant technologies is al… more
Date: December 1, 1996
Creator: Tyner, C.; Kolb, G. & Prairie, M.
Partner: UNT Libraries Government Documents Department
open access

Iron aluminide-titanium carbide composites: Microstructure and mechanical properties

Description: Composites of intermetallics and carbides (with binder contents less that 50 vol.%) are considered as potential candidates for applications requiring high wear resistance in corrosive environments. Intermetallics, especially aluminides, provide the corrosion resistance, and the high hardness of the carbide phase contributes to increased wear resistance of the composites. In this study, cost effective and simple processing techniques to obtain FeAl-TiC composites, over a wide range of binder vol… more
Date: September 1, 1996
Creator: Subramanian, R.; Schneibel, J. H. & Alexander, K. B.
Partner: UNT Libraries Government Documents Department
open access

New technologies in the D0 central tracker upgrade

Description: The D0 collaboration has undertaken an aggressive upgrade of its central tracking system. The existing tracker will be completely removed and replaced by a two Tesla superconducting solenoidal magnet, an 837 000 channel silicon vertex system, and 80 000 channel scintillating fiber tracker, followed by a 7 680 channel central preshower detector and a 16 000 channel forward preshower detector. In this paper the author discusses all of the subsystems of the D0 central tracker upgrade, but will emp… more
Date: June 1, 1996
Creator: Lincoln, D.
Partner: UNT Libraries Government Documents Department
open access

Bonding of WC with an iron aluminide (FeAl) intermetallic

Description: FeAl, which has high oxidation and sulfidation resistance, was shown to be thermodynamically compatible with WC. Calculations indicate that soly. of WC in liq. Fe-40at.%Al at 1450 C is about 2 at.%. Since liquid FeAl wets WC very well, the WC/FeAl system lends itself to liquid-phase sintering, resulting in close to theoretical densities. Almost fully dense cermets with 20.6 wt% FeAl binder were produced. With one-step infiltration, 98% dense cermets with only 7 wt% FeAl binder were fabricated. … more
Date: August 1, 1996
Creator: Schneibel, J. H. & Subramanian, R.
Partner: UNT Libraries Government Documents Department
open access

Microstructure and kinetics of hot corrosion for a nickel alloy in molten salt

Description: Metallography, analytical SEM, and XRD were used to measure kinetics and characterize the microstructure of hot corrosion of the Ni-Cr-Fe alloy INCONEL 600 after 500 h immersion in molten Na{sub 2}CO{sub 3}- NaCl salt at 900-950 C in an oxidizing atmosphere. This was done to assess the alloy as a reaction vessel material for a waste treatment process known as Molten Salt Oxidation. The alloy was found to hot corrode by surface oxidation and intergranular attack. Combined rate for loss of load-b… more
Date: December 1, 1996
Creator: Stevens, D.W.; Brummond, W.A.; Grimmett, D.L.; Newcomb, J.C.; Chiang, K.T. & Gay, R.L.
Partner: UNT Libraries Government Documents Department
open access

Thermomechanical processing of tungsten-copper composites

Description: A tungsten-40 wt% Cu composite was consolidated by liquid-phase sintering and further processed to full density by a number of deformation methods. Fully dense materials were obtained by hot extrusion or cold rolling of the W-Cu composite. Subsequent processing by cold rolling, cold swaging, or hot swaging did not produce large changes in the aspect ratio of the W particles. The materials develop high hardness with small grain sizes of 5 {mu}m or less. The work-hardening, recrystallization, and… more
Date: May 1, 1996
Creator: Ohriner, E.K. & Bryskin, B.
Partner: UNT Libraries Government Documents Department
open access

The Archimedes 2 mechanical assembly planning system

Description: We describe the implementation and performance of Archimedes 2, an integrated mechanical assembly planning system. Archimedes 2 includes two planners, two assembly sequence animation facilities, and an associated robotic workcell. Both planners use full 3 dimensional data. A rudimentary translator from high level assembly plans to control code for the robotic workcell has also been implemented. We can translate data from a commercial CAD system into input data for the system, which has allowed … more
Date: March 1, 1996
Creator: Kaufman, S. G.; Wilson, R. H.; Jones, R. E.; Calton, T. L. & Ames, A. L.
Partner: UNT Libraries Government Documents Department
open access

Laser engineered net shaping (LENS) for the fabrication of metallic components

Description: Solid free form fabrication is a fast growing automated manufacturing technology that has reduced the time between initial concept and fabrication. Starting with CAD renditions of new components, techniques such as stereolithography and selective laser sintering are being used to fabricate highly accurate complex 3-D objects using polymers. Together with investment casting, sacrificial polymeric objects are used to minimize cost and time to fabricate tooling used to make complex metal casting. … more
Date: June 1, 1996
Creator: Griffith, M. L.; Keicher, D. L.; Romero, J. A.; Atwood, C. L.; Harwell, L. D.; Greene, D. L. et al.
Partner: UNT Libraries Government Documents Department
open access

Mapping radionuclide distribution in surface sediments using GIS and an underwater HPGe detector

Description: A radiological distribution survey at the L Lake on the Savannah River Site (SRS) was conducted by the Savannah River Technology Center (SRTC) during the summer of 1995 as part of a larger project to examine future alternatives for L Lake and other SRS water bodies. The primary purpose of the survey was to confirm previous radionuclide surveys of Cesium-137 (137Cs) in the L Lake area. EG and G Energy Measurements, Inc. conducted an aerial, baseline radiological survey of the L Lake area and the… more
Date: September 1, 1996
Creator: Dunn, D.L.; Winn, W.G. & Bresnahan, P.J.
Partner: UNT Libraries Government Documents Department
open access

Improving the figure of very good mirrors by deposition

Description: Mid-spatial frequency errors of near perfect mirrors can be reduced by deposition through a computer generated mask without degrading the superpolish. Experimental results are presented.
Date: June 1996
Creator: Sweatt, W. C.; Weed, J. W.; Farnsworth, A. V.; Warren, M. E.; Neumann, C. C.; Goeke, R. S. et al.
Partner: UNT Libraries Government Documents Department
open access

NCMS PWB Surface Finishes Team project summary

Description: The NCMS PWB Surface Finishes Consortium is just about at the end of the five year program. Dozens of projects related to surface finishes and PWB solder-ability were performed by the team throughout the program, and many of them are listed in this paper. They are listed with a cross reference to where and when a technical paper was presented describing the results of the research. However, due to time and space constraints, this paper can summarize the details of only three of the major resear… more
Date: April 1, 1996
Creator: Kokas, J.; DeSantis, C. & Wenger, G.
Partner: UNT Libraries Government Documents Department
open access

Modeling of filamentation damage induced in silica by 351-nm laser pulses

Description: A major risk factor that must be considered in design of the National Ignition Facility is the possibility for catastrophic self-focusing of the 351-nm beam in the silica optical components that are in the final section of the laser. Proposed designs for the laser are analyzed by the beam-propagation code PROP92. A 351-nm self-focusing experiment, induction of tracking damage, was done to provide data for validation of this code. The measured self-focusing lengths were correctly predicted by th… more
Date: October 17, 1996
Creator: Milam, D.; Manes, K. R. & Williams, W. H.
Partner: UNT Libraries Government Documents Department
open access

Development program to recycle and purify plutonium-238 oxide fuel from scrap

Description: Nuclear Materials Technology (NMT) Division has initiated a development program to recover and purify plutonium-238 oxide from impure sources. A glove box line has been designed and a process flowsheet developed to perform this task on a large scale. The initial effort has focused on purification of {sup 238}PuO{sub 2} fuel that fails to meet General Purpose Heat Source (GPHS) specifications because of impurities. The notable non-actinide impurities were silicon and phosphorus, but aluminum, ch… more
Date: December 1996
Creator: Schulte, L. D.; Silver, G. L.; Avens, L. R.; Jarvinen, G. D.; Espinoza, J.; Foltyn, E. M. et al.
Partner: UNT Libraries Government Documents Department
open access

Free form fabrication of metallic components using laser engineered net shaping (LENS{trademark})

Description: Solid free form fabrication is one of the fastest growing automated manufacturing technologies that has significantly impacted the length of time between initial concept and actual part fabrication. Starting with CAD renditions of new components, several techniques such as stereolithography and selective laser sintering are being used to fabricate highly accurate complex three-dimensional concept models using polymeric materials. Coupled with investment casting techniques, sacrificial polymeric… more
Date: September 1, 1996
Creator: Griffith, M. L.; Keicher, D. M. & Atwood, C. L.
Partner: UNT Libraries Government Documents Department
open access

Solar central receiver technology: the Solar Two Project

Description: Solar Two will be the world`s largest operating solar central receiver power plant. It is expected to begin operating in April 1996; it is currently undergoing start-up and checkout. The plant will use sunlight reflected from 1926 sun-tracking mirrors to heat molten nitrate salt flowing in a heat exchanger (receiver) that sits atop a 200 foot tower. The heated salt will be stored in a tank for use, when needed, to generate superheated steam for producing electricity with a conventional Rankine-… more
Date: May 1, 1996
Creator: Sutherland, J.P.
Partner: UNT Libraries Government Documents Department
open access

The use of combustible metals in explosive incendiary devices

Description: We have investigated tailoring damage effects of explosive devices by addition of unconventional materials, specifically combustible metals. Initial small-scale as well as full-scale testing has been performed. The explosives functioned to disperse and ignite these materials. Incendiary, enhanced-blast, and fragment-damage effect have been identified. These types of effects can be used to extend the damage done to hardened facilities. In other cases it is desirable to disable the target with mi… more
Date: August 1, 1996
Creator: Fischer, S.H. & Grubelich, M.C.
Partner: UNT Libraries Government Documents Department
open access

Capillary flow of solder on chemically roughened PWB surfaces

Description: The Center for Solder Science and Technology at Sandia National Laboratories has developed a solderability test for evaluating fundamental solder flow over PWB (printed wiring boards) surface finishes. The work supports a cooperative research and development agreement between Sandia, the National Center for Manufacturing Sciences (NCMS), and several industrial partners. An important facet of the effort involved the ``engineering`` of copper surfaces through mechanical and chemical roughening. T… more
Date: February 1, 1996
Creator: Hosking, F. M.; Stevenson, J. O. & Yost, F. G.
Partner: UNT Libraries Government Documents Department
open access

Rapidity gaps between jets at D{O}

Description: We present studies of jet production via color-singlet events with low particle multiplicity between the jets. A preliminary study of the multiplicity in other regions of the color singlet events and the dependence of color-singlet exchange on jet transverse energy is also presented.
Date: July 1, 1996
Creator: Abachi, S.
Partner: UNT Libraries Government Documents Department
open access

Hard single diffractive jet production at D0

Description: Preliminary results from the D{null} experiment on jet production with forward rapidity gaps in {ital p{anti p}} collisions are presented. A class of dijet events with a forward rapidity gap is observed at center-of-mass energies {radical}s = 1800 GeV and 630 GeV. The number of events with rapidity gaps at both center-of-mass energies is significantly greater than the expectation from multiplicity fluctuations and is consistent with a hard single diffractive process. A small class of events wit… more
Date: August 1, 1996
Creator: Abachi, S.; Abbott, B. & Abolins, M.
Partner: UNT Libraries Government Documents Department
open access

Search for chargino-neutralino associated production via trileptonic final states with DO detector

Description: Preliminary results from a search for the production of an associated lightest chargino, W{sub 1}, and second lightest neutralino, Z{sub 2}, pair with the D0 detector at Fermilab`s pp collider with {radical}s = 1.8 TeV are presented. Based on approximately 85 pb{sup -1} of data collected during the 1993-1995 Tevatron Runs we set a 95% C.L. upper limit on the chargino-neutralino cross section times branching fraction to any trileptonic final state ranging from 0.91 pb to 0.19 pb for wino masses … more
Date: September 1, 1996
Creator: Abachi, S.; Ahn, S.; Baldin, B. & Bhat, P.C.
Partner: UNT Libraries Government Documents Department
open access

Small angle muon and b-quark production in p pbar collisions at squareroot s = 1.8 TeV

Description: We report on a measurement of small angle muon production (2.4 < {vert_bar}{ital y}{sup {mu}}{vert_bar} < 3.2) in {ital p}{ital {anti p}} collisions at {radical}s = 1.8 TeV with the D{null} detector at Fermilab. We have determined the fraction of the inclusive {mu} cross section in this region due to {ital b}-quark production and decay. Combining this measurement with our previously measured cross section in the central region, we calculate {ital d}{sigma}/{ital dy} for muons from {ital b} deca… more
Date: August 1, 1996
Creator: Abachi, S.
Partner: UNT Libraries Government Documents Department
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