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2-D electric fields and drifts near the magnetic separatrix in divertor tokamaks

Description: A 2-D calculation is presented for the transport of plasma in the edge region of a divertor tokamak solving continuity, momentum, and energy balance fluid equations. The model uses anomalous radial diffusion, including perpendicular ion momentum, and classical cross-field drifts transport. Parallel and perpendicular currents yield a self-consistent electrostatic potential on both sides of the magnetic separatrix. Outside the separatrix, the simulation extends to material divertor plates where t… more
Date: November 15, 1998
Creator: Mattor, N.; Porter, G. D.; Rognlien, T. D. & Ryutov, D. D.
Item Type: Refine your search to only Article
open access

1998 Complex Systems Summer School

Description: For the past eleven years a group of institutes, centers, and universities throughout the country have sponsored a summer school in Santa Fe, New Mexico as part of an interdisciplinary effort to promote the understanding of complex systems. The goal of these summer schools is to provide graduate students, postdoctoral fellows and active research scientists with an introduction to the study of complex behavior in mathematical, physical, and living systems. The Center for Nonlinear Studies suppor… more
Date: December 15, 1998
Item Type: Refine your search to only Report
open access

Agricultural Research, Education, and Extension Issues in the 105th Congress

Description: The public agricultural research, education, and extension system is comprised of a nationwide network of federal and state agricultural research laboratories and departments, land grant Colleges of Agriculture, colleges of forestry and veterinary medicine, and the nationwide Cooperative Extension System. Although the basic authority to conduct agricultural research and extension programs is permanent, Congress since 1977 has provided funding authority and policy guidance for USDA's in-house re… more
Date: January 15, 1998
Creator: Rawson, Jean M.
Item Type: Refine your search to only Report
open access

Los Alamos National Laboratory emergency management plan. Revision 1

Description: The Laboratory has developed this Emergency Management Plan (EMP) to assist in emergency planning, preparedness, and response to anticipated and actual emergencies. The Plan establishes guidance for ensuring safe Laboratory operation, protection of the environment, and safeguarding Department of Energy (DOE) property. Detailed information and specific instructions required by emergency response personnel to implement the EMP are contained in the Emergency Management Plan Implementing Procedure … more
Date: July 15, 1998
Creator: Ramsey, G.F.
Item Type: Refine your search to only Report
open access

Alignment and micro-inspection system

Description: A video microscope system has been designed and installed in the C-tank, a 3-g, high-explosive firing chamber in HEAF (High Explosives Applications Facility in LLNL). This microscope system helps a great deal, not only for precision alignment of the laser beam on the minute target for the Fabry-Perot velocimeter, but also for in situ inspection of the target before and after the experiment. In addition, the video information can also be stored in the PC computer as database documentati
Date: September 15, 1998
Creator: Chau, H; Hodgin, R L & Moua, K
Item Type: Refine your search to only Report
open access

Application of Integrated Reservoir Management and Reservoir Characterization to Optimize Infill Drilling.

Description: A total of 18 wells, 14 producers and 4 injection wells, were drilled and completed during the Field Demonstration portion of the project. These 18 wells are all currently in service, with the producing wells going on-line between May and September 1996, and the injection wells going into service between August and December 1996. Current Unit production is approximately 3,100 BOPD, of which approximately 800 BOPD is being contributed from the 14 Project 10-acre producing wells (Figure 1). A rev… more
Date: January 15, 1998
Item Type: Refine your search to only Report
open access

Application of system simulation for engineering the technical computing environment of the Lawrence Livermore National Laboratorie

Description: This report summarizes an investigation performed by Lawrence Livermore National Laboratory� s (LLNL) Scientific Computing & Communications Department (SCCD) and the Garland Location of Raytheon Systems Company (RSC) from April through August.1998. The study assessed the applicability and benefits of utilizing System Simulation in architecting and deploying technical computing assets at LLNL, particularly in support of the ASCI program and associated scientific computing needs. The recommendati… more
Date: September 15, 1998
Creator: Boyd, V.; Edmunds, T.; Minuzzo, K.; Powell, E. & Roche, L.
Item Type: Refine your search to only Report
open access

Atomic Structure and Properties of Extended Defects in Silicon

Description: The Z-contrast technique represents a new approach to high-resolution electron microscopy allowing for the first time incoherent imaging of materials on the atomic scale. The key advantages of the technique, an intrinsically higher resolution limit and directly interpretable, compositionally sensitive imaging, allow a new level of insight into the atomic configurations of extended defects in silicon. This experimental technique has been combined with theoretical calculations (a combination of f… more
Date: October 15, 1998
Creator: Buczko, R.; Chisholm, M.F.; Kaplan, T.; Maiti, A.; Mostoller, M.; Pantelides, S.T. et al.
Item Type: Refine your search to only Article
open access

Back Contact Effects on the Electro-Optical Properties of CdTe/CdS Solar Cells

Description: Studies of junction photoluminescence (PL) in CdTe/CdS solar cells reveal that back-contact application produces a dramatic qualitative change in the junction picosecond-PL spectrum. Prior to contact application, the spectrum has two peaks at energies of 1.501 eV and 1.457 eV, corresponding to recombination in regions of CdTeS alloy with 2% and 12% sulfur content, respectively. After contact application, the spectrum consists of a single broad peak at 1.48 eV. Previous studies have shown that t… more
Date: October 15, 1998
Creator: Levi, D. H.; Albin, D. S.; Gessert, T. A. (National Renewable Energy Laboratory) & Woods, L. M. (Department of Electrical Engineering, Colorado State University, Ft. Collins, CO)
Item Type: Refine your search to only Article
open access

Biological Monitoring Program for East Fork Poplar Creek

Description: In May 1985, a National Pollutant Discharge Elimination System (NPDES) permit was issued for the Oak Ridge Y-12 Plant. As a condition of the permit, a Biologicai Monitoring and Abatement Program (BMAP) was developed to demonstrate that the effluent limitations established for the Y-12 Plant protect the classified uses of the receiving stream (East Fork Poplar Creek; EFPC), in particular, the growth and propagation of aquatic life (Lear et al. 1989). A second objective of the BMAP is to document… more
Date: October 15, 1998
Creator: Adams, S. M.; Christensen, S. W.; Greeley, M. S. Jr.; Hill, W. R.; Kszos, L. A.; McCarthy, J. F. et al.
Item Type: Refine your search to only Report
open access

[Calibration methods for neutron diagnostics at Omega]. DOE/NLUF final report

Description: The investigation of Calibration Methods for Neutron Diagnostics at Omega is still underway. The data shown here is a compilation of measurements taken at Omega during the time of the grant. The data set has been updated with additional information taken this year. The neutron yield from an ICF event was determined by measuring the activity of an aluminum sample activated by target-produced DT neutrons. The radioactive nuclei {sup 24}Na and {sup 27}Mg, which were produced via the {sup 27}Al(n,{… more
Date: January 15, 1998
Creator: Padalino, S.
Item Type: Refine your search to only Report
open access

Campaign Finance Reform: A Legal Analysis of Issue and Express Advocacy

Description: Issue advocacy communications have become increasingly popular over the federal election cycles. Often these advertisements could be interpreted to favor or disfavor certain candidates, while also serving to inform the public about a policy issue. However, unlike communications that expressly advocate the election or defeat of a clearly identified candidate, the Supreme Court has ruled that issue ads are constitutionally protected First Amendment speech and cannot be regulated.
Date: May 15, 1998
Creator: Whitaker, L. Paige
Item Type: Refine your search to only Report
open access

Comparison of Analytical and Experimental Effectiveness of Four-Row Plate-Fin-Tube Heat Exchangers with Water, R-22, and R-410A

Description: The analytical solutions of heat exchanger effectiveness for four-row crcmilow, cross-countertlow and cross-paralleltlow have been derived in the recent study. The main objective of this study is to investigate the etlkct of heat exchawger tlow conllguration on thermal performance with refrigerant mixtures. Difference of heat exchanger effectiveness for all flow arrangements relative to an analytical many-row solution has been analyzed. A comparison of four-row cross cou~ltet-ilow heat exchange… more
Date: November 15, 1998
Creator: Baxter, V. D.; Chen, T. D. & Conklin, J. C.
Item Type: Refine your search to only Article
open access

Comparison of Natural Convection Heat Exchangers for Solar Water Heating Systems

Description: Thermosyphon heat exchangers are used in indirect solar water heating systems to avoid using a pump to circulate water from the storage tank to the heat exchanger. In this study, the authors consider the effect of heat exchanger design on system performance. They also compare performance of a system with thermosyphon flow to the same system with a 40W pump in the water loop. In the first part of the study, the authors consider the impact of heat exchanger design on the thermal performance of bo… more
Date: September 15, 1998
Creator: Davidson, J. & Liu, W.
Item Type: Refine your search to only Report
open access

Concentration of uranium and plutonium in unsaturated spent fuel tests.

Description: Commercial spent fuel is being tested under oxidizing conditions at 90 C in drip tests with simulated groundwater to evaluate its long-term performance in a potential repository at Yucca Mountain [1-4]. The tests allow us to monitor the dissolution behavior of the spent fuel matrix and the release rates of individual radionuclides. This paper reports the U and Pu concentrations in the leachates of drip tests during 3.7 years of reaction. Changes in these concentrations are correlated with chang… more
Date: April 15, 1998
Creator: Finn, P. A.
Item Type: Refine your search to only Article
open access

Continuous, Rapid Production of Uniform Microparticles by Electrodispersion

Description: Ultrafine particles constitute the key building blocks for diverse advanced structural and functional materials, such as high-performance ceramics and alloys. These advanced materials have tremendous impact in many areas, including catalysis, separations, electronics, energy production processes, and environmental applications. Of particular importance, nanophase ceramic or metallic materials that contain nanosized (<100 nm) particles/grains show dramatically improved performance (mechanical… more
Date: November 15, 1998
Creator: DePaoli, D.W. & Hu, M.Z.-C.
Item Type: Refine your search to only Article
open access

Corrective Action Investigation Plan for Corrective Action Unit 486: Double Tracks RADSAFE Area Nellis Air Force Range, Nevada

Description: This Corrective Action Investigation Plan (CAIP) has been developed in accordance with the Federal Facility Agreement and Consent Order (FFACO) that was agreed to by the US Department of Energy, Nevada Operations Office (DOE/NV); the State of Nevada Division of Environmental Protection (NDEP); and the US Department of Defense (FFACO, 1996). The CAIP is a document that provides or references all of the specific information for investigation activities associated with Corrective Action Units (CAU… more
Date: October 15, 1998
Creator: Vegas, IT Las
Item Type: Refine your search to only Report
open access

Creating metallic under-dense radiators by electron beam heating prior to laser impact

Description: A pulsed, relativistic electron beam can heat a metal foil to a plasma state, and initiate an expanding flow into vacuum. At a given time in its evolution, this flow fills a nearly spherical volume with nearly uniform density, assuming a rapid expansion prior to any condensation. A metal cloud produced in this way can serve as a target of intense laser illumination to create an under-dense radiator of x-rays. The phrase ''under-dense radiator'' means that the cloud, assumed ionized, has a plasm… more
Date: December 15, 1998
Creator: Garcia, M
Item Type: Refine your search to only Report
open access

Cryogenic D-T fuel layers formed in 1mm spheres by beta-layering

Description: Solid D-T fuel smoothly layered on the interior of spherical capsules is required for all inertial confinement fusion ignition target designs. One process for forming these layers, beta-layering, has been studied in surrogate geometries such as open cylinders or tori to allow accurate characterization of the DT surfaces. We present the first results from beta layering in 1 mm spherical containers, such as will be used in upcoming Omega experiments. These results are also directly relevant to ig… more
Date: October 15, 1998
Creator: Bernat, T. P.; Burmann, J.; Collins, G. W.; Kozioziemski, B.; Mapoles, E. R.; Pipes, J. et al.
Item Type: Refine your search to only Article
open access

Current Status of Health and Safety Issues of Sodium/Metal Chloride (Zebra) Batteries

Description: This report addresses environmental, health, and safety (EH&S) issues associated with sodium/ metal chloride batteries, in general, although most references to specific cell or battery types refer to units developed or being developed under the Zebra trademark. The report focuses on issues pertinent to sodium/metal chloride batteries and their constituent components; however, the fact that some ''issues'' arise from interaction between electric vehicle (EV) and battery design compels occasi… more
Date: December 15, 1998
Creator: Trickett, D.
Item Type: Refine your search to only Report
open access

Decontamination of Radionuclides from Concrete During and After Thermal Treatment

Description: The objective was to clarify from the theoretical viewpoint the mechanical, diffusional, thermodynamic and electromagnetic aspects of the decontaminations problem, by means of developing a powerful computational model to evaluate the effect of a very rapid heating regime on the on the contaminated concrete walls or slabs. The practical objective was to assess the feasibility of the microwave heating scheme envisaged and determine its suitable parameters such as power and duration. This objectiv… more
Date: September 15, 1998
Creator: Bazant, Z. P.
Item Type: Refine your search to only Report
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