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531 Matching Results

Start Over Year 1999 Day 2nd

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Results: 1 - 24 of 531 next

(open access)

B Plant Complex preclosure work plan

This preclosure work plan describes the condition of the dangerous waste treatment storage, and/or disposal (TSD) unit after completion of the B Plant Complex decommissioning Transition Phase preclosure activities. This description includes waste characteristics, waste types, locations, and associated hazards. The goal to be met by the Transition Phase preclosure activities is to place the TSD unit into a safe and environmentally secure condition for the long-term Surveillance and Maintenance (S&M) Phase of the facility decommissioning process. This preclosure work plan has been prepared in accordance with Section 8.0 of the Hanford Federal Facility Agreement and Consent Order (Tri-Party Agreement) (Ecology et al. 1996). The preclosure work plan is one of three critical Transition Phase documents, the other two being: B Plant End Points Document (WHC-SD-WM-TPP-054) and B Plant S&M plan. These documents are prepared by the U.S. Department of Energy, Richland Operations Office (DOE-RL) and its contractors with the involvement of Washington State Department of Ecology (Ecology). The tanks and vessels addressed by this preclosure work plan are limited to those tanks end vessels included on the B Plant Complex Part A, Form 3, Permit Application (DOE/RL-88-21). The criteria for determining which tanks or vessels are in the Part …

Date: February 2, 1999

Creator: ADLER, J.G.

Object Type: Report

System: The UNT Digital Library

(open access)

Sepradyne/Raduce High Vacuum Thermal Process for Destruction of Dioxins in Ineel/Werf Fly Ash.

This study investigated the use of an indirectly heated, high temperature (900 C), high vacuum (28 inch Hg) rotary kiln, developed and patented by Raduce, Inc. (subsidiary of Sepradyne Corp.), to treat a dioxin contaminated mixed waste incinerator ash from the Idaho National Engineering Lab (INEEL) Waste Experimental Reduction Facility (WERF). A 500 cm{sup 3} bench-scale rotary vacuum thermal desorption and destruction unit (DDU) was used at Brookhaven National Laboratory (BNL) to demonstrate this thermal treatment process. Dioxins and furans were successfully decomposed at both low (450 C) and high (700-800 C) temperature regimes. In addition, substantial volume and mass reduction of the ash was achieved. Stabilization of the nonvolatile residues by a post-treatment encapsulation process may be required to reduce the leachability of RCRA metals to levels below the EPA Toxicity Characteristic Leaching Procedure (TCLP) requirements.

Date: August 2, 1999

Creator: Adams, J. W.; Kalb, P. D. & Malkmus, D. B.

Object Type: Report

System: The UNT Digital Library

(open access)

Sepradyne/Reduce High Vacuum Thermal Process for Destruction of Dioxins in Ineel/Werf Fly Ash.

This study investigated the use of an indirectly heated, high temperature (900 C), high vacuum (28'' Hg) rotary kiln, developed and patented by Raduce, Inc. (subsidiary of Sepradyne Corp.), to treat a dioxin contaminated mixed waste incinerator ash from the Idaho National Engineering Lab (INEEL) Waste Experimental Reduction Facility (WERF). A 500 cm{sup 3} bench-scale rotary vacuum thermal desorption and destruction unit (DDU) was used at Brookhaven National Laboratory (BNL) to demonstrate this thermal treatment process. Dioxins and furans were successfully decomposed at both low (450 C) and high (700-800 C) temperature regimes. In addition, substantial volume and mass reduction of the ash was achieved. Stabilization of the nonvolatile residues by a post-treatment encapsulation process may be required to reduce the leachability of RCRA metals to levels below the EPA Toxicity Characteristic Leaching Procedure (TCLP) requirements.

Date: August 2, 1999

Creator: Adams, J. W.; Kalb, P. D. & Malkmus, D. B.

Object Type: Report

System: The UNT Digital Library

(open access)

The Virtual Library in Action

The SLAC Library has for many years provided SPIRES-HEP, a 300,000 record bibliographic database, to the world particle physics community via the Internet as well as through clone sites in Europe and Japan. The 1991 introduction of the e-print archives at LANL coupled with the World-Wide-Web (WWW) from CERN suddenly made it possible to provide easy linkage between bibliographic database records and the actual full-text of papers. The SLAC Library has turned this possibility into reality by converting hundreds of TeX source documents each month into viewable postscript complete with figures. These (now more than 20,000) postscript files are linked to the HEP database, and the full-text is rendered universally visible via WWW. We discuss the project, the collaboration of physicists and librarians, what is easy, what is hard, and our vision for the future.

Date: July 2, 1999

Creator: Addis, Louise

Object Type: Report

System: The UNT Digital Library

(open access)

Molecular size and structure in pyridine extracts of upper Freeport coal as separated by M41S sieving.

The determination of the structure of coal has long been of interest due to its crucial importance in research on reactivity and processing. However, the chemically and physically heterogeneous nature of coals makes determination of the chemical nature of even the building blocks complicated, since the molecular structure and molecular weight distribution are not dependent on a single molecule or repeat unit as in technical polymers or biopolymers, but on a complex mixture of molecules and potential connections between them which may vary among coals. Coal extracts have long been used to obtain coal material in solution form that can readily be characterized. However, what part of the total coal structure these extracts represent is not completely known. Pyridine has been a particularly good solvent for coal; for example, the extractability of Upper Freeport has been shown to be as high 30%. Although pyridine extracts of coal have been referred to as solutions, there is good evidence that they are not truly solvated, but are dispersions which are polydisperse in particle size. The particle sizes may span the size range from clusters of small molecules (a few {angstrom}) to extended clusters of large particles (a few hundred {angstrom}), not unlike …

Date: July 2, 1999

Creator: Ahrens, M.; Hunt, J. E.; Winans, R. E. & Xu, L.

Object Type: Article

System: The UNT Digital Library

(open access)

Bruker AMX Y Channel Heteronuclear Decoupling Using a Linear Amplifier

Under both static and common MAS conditions (< 15 kHz) the question of residual X-Y heteronuclear decoupling can become a complicating factor in the analysis of various NMR results. In our lab the impact of {sup 31}P-{sup 23}Na dipolar coupling on the observed {sup 23}Na M{sub 2} relaxation for a series of sodium phosphate glasses was recently investigated by employing continuous wave {sup 31}P decoupling during the entire pulse sequence. Initially these efforts were complicate by the inability to provide a gating pulse during the data acquisition using the standard Bruker nomenclature, go=2, for the acquisition loop. A pulse sequence to overcome these restrictions is given below. Our AMX400 instrument is configured with a 3 channel MCI, but utilizes a linear AMT amplifier on the 3rd channel (requiring gating pulse via the C4 program call during the entire time it is on). The standard acquisition loop has been replaced by direct adc and aq commands for data acquisition. Unlike the go=2 statement which does not allow a C4 gating command to be included, these individual acquisition commands can all include distinct C4 gating.

Date: August 2, 1999

Creator: Alam, Todd M. & Lang, David P.

Object Type: Article

System: The UNT Digital Library

Oral History Interview with Shuford M. Alexander, Jr., December 2, 1999

Access: Use of this item is restricted to the UNT Community

Interview with engineer and Army Air Forces veteran Shuford M. Alexander, Jr. The interview includes Alexander's personal experiences about being a fighter pilot in Italy during World War II, basic training, flight training, various assignments and transfers, Operation STRANGLE, being shot down by flak over Piacenza, and being rescued by Italian partisans. Additionally, Alexander talks about his link-up with a British A-4 Mission and his attempt to reach Allied lines, his betrayal by a German agent and his subsequent capture, escaping and continuing his search for Allied lines, his observations and opinions about the partisans, a second encounter with a British A-4 Mission, the Martani family in the village of Tosca, his group's trek through mountain snow to reach Allied lines, meeting with British paratroopers and with African-American soldiers from the 92nd Infantry Division, and his reunion with his squadron in Pisa. The interview includes an appendix with a narrative by Alexander.

Date: December 2, 1999

Creator: Alexander, William J. & Alexander, Shuford M., Jr.

Object Type: Book

System: The UNT Digital Library

(open access)

The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 96, Ed. 1 Tuesday, February 2, 1999

Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.

Date: February 2, 1999

Creator: Allam, Heather

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 116, Ed. 1 Tuesday, March 2, 1999

Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.

Date: March 2, 1999

Creator: Allam, Heather

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 132, Ed. 1 Friday, April 2, 1999

Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.

Date: April 2, 1999

Creator: Allam, Heather

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

The effect of low dose rate irradiation on the swelling of 12% cold-worked 316 stainless steel.

In pressurized water reactors (PWRs), stainless steel components are irradiated at temperatures that may reach 400 C due to gamma heating. If large amounts of swelling (>10%) occur in these reactor internals, significant swelling related embrittlement may occur. Although fast reactor studies indicate that swelling should be insignificant at PWR temperatures, the low dose rate conditions experienced by PWR components may possibly lead to significant swelling. To address these issues, JNC and ANL have collaborated to analyze swelling in 316 stainless steel, irradiated in the EBR-II reactor at temperatures from 376-444 C, at dose rates between 4.9 x 10{sup {minus}8} and 5.8 x 10{sup {minus}7} dpa/s, and to doses of 56 dpa. For these irradiation conditions, the swelling decreases markedly at temperatures less than approximately 386 C, with the extrapolated swelling at 100 dpa being around 3%. For temperatures greater than 386 C, the swelling extrapolated to 100 dpa is around 9%. For a factor of two difference in dose rate, no statistically significant effect of dose rate on swelling was seen. For the range of dose rates analyzed, the swelling measurements do not support significant (>10%) swelling of 316 stainless steel in PWRs.

Date: March 2, 1999

Creator: Allen, T. R.

Object Type: Article

System: The UNT Digital Library

(open access)

Deep Levels in p-Type InGaAsN Lattice Matched to GaAs

Deep level transient spectroscopy (DLTS) measurements were utilized to investigate deep level defects in metal-organic chemical deposition (MOCVD)-grown unintentionally doped p-type InGaAsN films lattice matched to GaAs. The as-grown material displayed a high concentration of deep levels distributed within the bandgap, with a dominant hole trap at E{sub v} + 0.10 eV. Post-growth annealing simplified the deep level spectra, enabling the identification of three distinct hole traps at 0.10 eV, 0.23 eV, and 0.48 eV above the valence band edge, with concentrations of 3.5 x 10{sup 14} cm{sup {minus}3}, 3.8 x 10{sup 14} cm{sup {minus}3}, and 8.2 x 10{sup 14} cm{sup {minus}3}, respectively. A direct comparison between the as-grown and annealed spectra revealed the presence of an additional midgap hole trap, with a concentration of 4 x 10{sup 14} cm{sup {minus}3} in the as-grown material. The concentration of this trap is sharply reduced by annealing, which correlates with improved material quality and minority carrier properties after annealing. Of the four hole traps detected, only the 0.48 eV level is not influenced by annealing, suggesting this level may be important for processed InGaAsN devices in the future.

Date: March 2, 1999

Creator: Allerman, A. A.; Jones, E. D.; Kaplar, R. J.; Kurtz, S. R.; Kwon, D. & Ringel, S. A.

Object Type: Article

System: The UNT Digital Library

(open access)

A High-Intensity, RF Plasma-Sputter Negative Ion Source

A high-intensity, plasma-sputter negative-ion source based on the use of RF power for plasma generation has been developed that can be operated in either pulsed or dc modes. The source utilizes a high-Q, self-igniting, inductively coupled antenna system, operating at 80 MHz that has been optimized to generate Cs-seeded plasmas at low pressures (typically, <1 mTorr for Xe). The source is equipped with a 19-mm diameter spherical-sector cathode machined from the desired material. To date, the source has been utilized to generate dc negative-ion beams from a variety of species, including: C{sup {minus}}(610 {micro}A); F{sup {minus}}(100 {micro}A); Si{sup {minus}}(500 {micro}A); S{sup {minus}}(500 {micro}A); P{sup {minus}}(125 {micro}A); Cl{sup {minus}}(200 {micro}A); Ni{sup {minus}}(150 {micro}A); Cu{sup {minus}}(230 {micro}A); Ge{sup {minus}}(125 {micro}A); As{sup {minus}}(100 {micro}A); Se{sup {minus}}(200 {micro}A); Ag{sup {minus}}(70 {micro}A); Pt{sup {minus}}(125 {micro}A); Au{sup {minus}}(250 {micro}A). The normalized emittance {var_epsilon}{sub n} of the source at the 80% contour is: {var_epsilon}{sub n} = 7.5 mm.mrad.(MeV){sup 1/2}. The design principles of the source, operational parameters, ion optics, emittance and intensities for a number of negative-ion species will be presented in this report.

Date: March 2, 1999

Creator: Alton, G. D.; Bao, Y.; Cui, B.; Lohwasser, R.; Reed, C. A. & Zhang, T.

Object Type: Article

System: The UNT Digital Library

(open access)

Fuel and emission impacts of heavy hybrid vehicles.

Hybrid powertrains for certain heavy vehicles may improve fuel economy and reduce emissions. Of particular interest are commercial vehicles, typically in Classes 3-6, that travel in urban areas. Hybrid strategies and associated energy/emissions benefits for these classes of vehicles could be significantly different from those for passenger cars. A preliminary analysis has been conducted to investigate the energy and emissions performance of Class 3 and 6 medium-duty trucks and Class 6 school buses under eight different test cycles. Three elements are associated with this analysis: (1) establish baseline fuel consumption and emission scenario's from selected, representative baseline vehicles and driving schedules; (2) identify sources of energy inefficiency from baseline technology vehicles; and (3) assess maximum and practical potentials for energy savings and emissions reductions associated with heavy vehicle hybridization under real-world driving conditions. Our analysis excludes efficiency gains associated with such other measures as vehicle weight reduction and air resistance reduction, because such measures would also benefit conventional technology vehicles. Our research indicates that fuel economy and emission benefits of hybridization can be very sensitive to different test cycles. We conclude that, on the basis of present-day technology, the potential fuel economy gains average about 60-75% for Class 3 medium-duty …

Date: March 2, 1999

Creator: An, F.; Eberhardt, J. J. & Stodolsky, F.

Object Type: Article

System: The UNT Digital Library

(open access)

D0 HVAC System Heat Pump Controller Programming, Networking, and Operating Information

The purpose of this engineering note is to provide the necessary information to setup, program, and network the Electronic Systems USA Heat Pump Controller with the LON network card and Intellution Fix32 to operate properly within the HVAC system at D-Zero. The heat pump controllers are used for local temperature control of the office environments on the fifth and six floors of D-Zero. Heat pump units 1-6 are located in the ceiling of the sixth floor. Heat pump units 7-12 are found in the fifth floor ceiling. Heat pump unit 13 is in the Southeast corner of the fifth floor. Prior to installation the heat pump controller must be properly prepared to operate correctly in the HVAC system. Each heat pump unit must contain firmware (software) version 1.31 to operate properly on the network. Controllers with version 1.30 will not be able to communicate over the LON network. The manufacturer can only update the firmware version. Before installation a series of heat pump setpoints must be manually set using the Intelligent Stat. Connect the Intelligent Stat via the serial cable or wired connection.

Date: December 2, 1999

Creator: Anderson, B.

Object Type: Report

System: The UNT Digital Library

(open access)

Simulation of beamline alignment operations

The CORBA-based Simulator was a Laboratory Directed Research and Development (LDRD) project that applied simulation techniques to explore critical questions about distributed control systems. The simulator project used a three-prong approach that studied object-oriented distribution tools, computer network modeling, and simulation of key control system scenarios. The National Ignition Facility's (NIF) optical alignment system was modeled to study control system operations. The alignment of NIF's 192 beamlines is a large complex operation involving more than 100 computer systems and 8000 mechanized devices. The alignment process is defined by a detailed set of procedures; however, many of the steps are deterministic. The alignment steps for a poorly aligned component are similar to that of a nearly aligned component; however, additional operations/iterations are required to complete the process. Thus, the same alignment operations will require variable amounts of time to perform depending on the current alignment condition as well as other factors. Simulation of the alignment process is necessary to understand beamline alignment time requirements and how shared resources such as the Output Sensor and Target Alignment Sensor effect alignment efficiency. The simulation has provided alignment time estimates and other results based on documented alignment procedures and alignment experience gained in the …

Date: February 2, 1999

Creator: Annese, C & Miller, M G

Object Type: Report

System: The UNT Digital Library

(open access)

The Lyman Alpha Forest in hierarchical cosmologies

The comparison of quasar absorption spectra with numerically simulated spectra from hierarchical cosmological models of structure formation promises to be a valuable tool to discriminate among these models. We present simulation results for the column density, Doppler b parameter, and optical depth probability distributions for five popular cosmological models.

Date: July 2, 1999

Creator: Anninos, P.; Bryan, G. L.; Machacek, M.; Moiksin, A.; Norman, M. L. & Zhang, Y.

Object Type: Article

System: The UNT Digital Library