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1-D Equilibrium Discrete Diffusion Monte Carlo

Description: We present a new hybrid Monte Carlo method for 1-D equilibrium diffusion problems in which the radiation field coexists with matter in local thermodynamic equilibrium. This method, the Equilibrium Discrete Diffusion Monte Carlo (EqDDMC) method, combines Monte Carlo particles with spatially discrete diffusion solutions. We verify the EqDDMC method with computational results from three slab problems. The EqDDMC method represents an incremental step toward applying this hybrid methodology to non-e… more
Date: August 2000
Creator: Evans, T. M.; Urbatsch, T. J. & Lichtenstein, H.
Item Type: Refine your search to only Article
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10th Workshop on Crystalline Silicon Solar Cell Materials and Processes: Extended Abstracts and Papers from the Workshop, Copper Mountain Resort; August 14-16, 2000

Description: The 10th Workshop provided a forum for an informal exchange of technical and scientific information between international researchers in the photovoltaic and non-photovoltaic fields. Discussions included the various aspects of impurities and defects in silicon-their properties, the dynamics during device processing, and their application for developing low-cost processes for manufacturing high-efficiency silicon solar cells. Sessions and panel discussions also reviewed thin-film crystalline-sil… more
Date: August 11, 2000
Creator: Sopori, B. L.; Gee, J.; Kalejs, J.; Saitoh, R.; Stavola, M.; Swanson, D. et al.
Item Type: Refine your search to only Article
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1999 Gordon Research Conference on Atmospheric Chemistry

Description: The Gordon Research Conference (GRC) on Atmospheric Chemistry was held at Salve Regina University in Newport, Rhode Island, June 13-18, 1999. The conference was well attended with 151 participants. The attendees represented the spectrum of endeavor in this field coming from academia, industry, and government laboratories, both US and foreign scientists, senior researchers, young investigators, and students.
Date: August 1, 2000
Creator: Storm, C.
Item Type: Refine your search to only Article
open access

20th International Congress of Theoretical and Applied Mechanics, ICTAM2000

Description: The 20th International Congress of Theoretical and Applied Mechanics, ICTAM2000, was held in Chicago, IL, from August 27 - September 2, 2000. It was 32 years since the last of these congresses had been held in USA. A record number of researchers in the mechanical engineering sciences attended and presented their work. The Congress provided an opportunity for the US mechanics community to act as international hosts. Several universities, professional societies, private foundations and individual… more
Date: August 27, 2000
Creator: Hassan, Aref
Item Type: Refine your search to only Article
open access

ACRES: An Efficient Method for First-Principles Electronic Structure Calculations of Complex Systems

Description: The authors discuss their new implementation of the Adaptive Coordinate Real-space Electronic Structure (ACRES) method for studying the atomic and electronic structure of infinite periodic as well as finite systems, based on density functional theory. This improved version aims at making the method widely applicable and efficient, using high performance Fortran on parallel architectures. The scaling of various parts of an ACRES calculation is analyzed and compared to that of plane-wave based me… more
Date: August 29, 2000
Creator: Waghmare, R. V.; Kim, Hanchul; Park, I. J.; Modine, Normand A.; Maragakis, P. & Kaxiras, Efthimios
Item Type: Refine your search to only Article
open access

Active Waste Materials Corrosion and Decontamination Tests

Description: Stainless steel alloys, 304L and 316L, were corrosion tested in representative radioactive samples of three actual Hanford tank waste solutions (Tanks AW-101, C-104, AN-107). Both the 304L and 316L exhibited good corrosion performance when immersed in boiling waste solutions. The maximum general corrosion rate was 0.015 mm/y (0.60 mils per year). Generally, the 304L had a slightly higher rate than the 316L. No localized attack was observed after 122 days of testing in the liquid phase, liquid/v… more
Date: August 15, 2000
Creator: Danielson, MJ; Elmore, MR & Pitman, SG
Item Type: Refine your search to only Report
open access

Adaptive optics for improved retinal surgery and diagnostics

Description: It is now possible to field a compact adaptive optics (AO) system on a surgical microscope for use in retinal diagnostics and surgery. Recent developments in integrated circuit technology and optical photonics have led to the capability of building an AO system that is compact and significantly less expensive than traditional AO systems. It is foreseen that such an AO system can be integrated into a surgical microscope while maintaining a package size of a lunchbox. A prototype device can be de… more
Date: August 21, 2000
Creator: Humayun, M. S.; Sadda, S. R.; Thompson, C. A.; Olivier, S. S. & Kartz, M. W.
Item Type: Refine your search to only Report
open access

Additional Information Related to Analysis of the Administration's Proposal to Ensure Solvency of the United Mine Workers of America Combined Benefit Fund

Description: Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the United Mine Workers of America Combined Benefit Fund."
Date: August 31, 2000
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
open access

Advanced Energy Efficiency Design Strategies In Retail Buildings

Description: This paper presents two US retail building projects that were designed and constructed using the energy design process. These buildings, the BigHorn Center in Silverthorne, Colorado, and the Zion National Park Visitor Center in Springdale, Utah, were both completed and occupied during the spring of 2000.
Date: August 17, 2000
Creator: Hayter, S. & Torcellini, P.
Item Type: Refine your search to only Article
open access

Advanced Industrial Materials (AIM) Program Compilation of Project Summaries and Significant Accomplishments FY 1999

Description: For the past 10 years the Advanced Industrial Materials (AIM) has supported development of new and improved materials to enable U.S. industry to improve energy efficiency, increase productivity, and reduce waste. It has been a National Laboratory based program, with work currently under way at Oak Ridge National Laboratory, Los Alamos National Laboratory, and Sandia National Laboratories, in collaboration with industrial and university partners. With the advent of the Industries of the Future (… more
Date: August 8, 2000
Creator: Angelini, P
Item Type: Refine your search to only Report
open access

Advanced Techniques for Reservoir Simulation and Modeling of Non-Conventional Wells

Description: This project targets the development of (1) advanced reservoir simulation techniques for modeling non-conventional wells; (2) improved techniques for computing well productivity (for use in reservoir engineering calculations) and well index (for use in simulation models), including the effects of wellbore flow; and (3) accurate approaches to account for heterogeneity in the near-well region.
Date: August 28, 2000
Creator: Durlofsky, Louis J.
Item Type: Refine your search to only Report
open access

AIR DISPERSION MODELING AT THE WASTE ISOLATION PILOT PLANT

Description: One concern at the Waste Isolation Pilot Plant (WIPP) is the amount of alpha-emitting radionuclides or hazardous chemicals that can become airborne at the facility and reach the Exclusive Use Area boundary as the result of a release from the Waste Handling Building (WHB) or from the underground during waste emplacement operations. The WIPP Safety Analysis Report (SAR), WIPP RCRA Permit, and WIPP Emergency Preparedness Hazards Assessments include air dispersion calculations to address this issue… more
Date: August 1, 2000
Creator: Rucker, D. F.
Item Type: Refine your search to only Report
open access

Air Force Depot Maintenance: Budgeting Difficulties and Operational Inefficiencies

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a legislative requirement, GAO provided information on the financial and management issues related to the depot maintenance activity group of the Air Force Working Capital Fund."
Date: August 15, 2000
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Report
open access

Algorithmic Strategies in Combinatorial Chemistry

Description: Combinatorial Chemistry is a powerful new technology in drug design and molecular recognition. It is a wet-laboratory methodology aimed at ``massively parallel'' screening of chemical compounds for the discovery of compounds that have a certain biological activity. The power of the method comes from the interaction between experimental design and computational modeling. Principles of ``rational'' drug design are used in the construction of combinatorial libraries to speed up the discovery of le… more
Date: August 1, 2000
Creator: Goldman, Deborah; Istrail, Sorin; Lancia, Giuseppe; Piccolboni, Antonio & Walenz, Brian
Item Type: Refine your search to only Article
open access

Alternative Minimum Tax: An Overview of Its Rationale and Impact on Individual Taxpayers

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the alternative minimum tax (AMT) system, focusing on: (1) the rationale for establishing AMT; (2) how AMT affects taxpayers' tax liability; (3) the expected increase in AMT coverage and additional tax liability and the major reasons for the increase; and (4) the impact of the projected increase in AMT coverage on taxpayers' compliance burden and… more
Date: August 15, 2000
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Report
open access

The Aluminum-Free P-n-P InGaAsN Double Heterojunction Bipolar Transistors

Description: The authors have demonstrated an aluminum-free P-n-P GaAs/InGaAsN/GaAs double heterojunction bipolar transistor (DHBT). The device has a low turn-on voltage (V{sub ON}) that is 0.27 V lower than in a comparable P-n-p AlGaAs/GaAs HBT. The device shows near-ideal D. C. characteristics with a current gain ({beta}) greater than 45. The high-speed performance of the device are comparable to a similar P-n-p AlGaAs/GaAs HBT, with f{sub T} and f{sub MAX} values of 12 GHz and 10 GHz, respectively. This … more
Date: August 1, 2000
Creator: Chang, Ping-Chih; Li, N. Y.; Baca, Albert G.; Monier, C.; Laroche, J. R.; Hou, H. Q. et al.
Item Type: Refine your search to only Article
open access

Americans' Average Radiation Exposure

Description: We live with radiation every day. We receive radiation exposures from cosmic rays, from outer space, from radon gas, and from other naturally radioactive elements in the earth. This is called natural background radiation. It includes the radiation we get from plants, animals, and from our own bodies. We also are exposed to man-made sources of radiation, including medical and dental treatments, television sets and emission from coal-fired power plants. Generally, radiation exposures from man-mad… more
Date: August 11, 2000
Creator: NA
Item Type: Refine your search to only Report
open access

Americium Separations From Nitric Acid Process Effluent Streams

Description: The aging of the US nuclear stockpile presents a number of challenges, including the ever-increasing radioactivity of plutonium residues from {sup 241}Am. Minimization of this weak gamma-emitter in process and waste solutions is desirable to reduce both worker exposure and the effects of radiolysis on the final waste product. Removal of americium from plutonium nitric acid processing effluents, however, is complicated by the presence of large.quantities of competing metals, particularly Fe and … more
Date: August 1, 2000
Creator: Barr, M. & Jarvinen, G.
Item Type: Refine your search to only Article
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