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2-D Finite Element Cable and Box IEMP Analysis

Description: A 2-D finite element code has been developed for the solution of arbitrary geometry cable SGEMP and box IEMP problems. The quasi- static electric field equations with radiation- induced charge deposition and radiation-induced conductivity y are numerically solved on a triangular mesh. Multiple regions of different dielectric materials and multiple conductors are permitted.
Date: December 17, 1998
Creator: Scivner, G.J. & Turner, C.D.
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9 M.y. record of southern Nevada climate from Yucca Mountain secondary minerals

Description: Yucca Mountain, Nevada, is presently the object of intense study as a potential permanent repository for the Nation`s high-level radioactive wastes. The mountain consists of a thick sequence of volcanic tuffs within which the depth to water table ranges from 500 to 700 meters below the land surface. This thick unsaturated zone (UZ), which would host the projected repository, coupled with the present day arid to semi-arid climate, is considered a favorable attribute of the site. Evaluation of th… more
Date: December 1998
Creator: Whelan, Joseph F. & Moscati, Richard J.
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open access

An 800-MeV proton radiography facility for dynamic experiments

Description: The capability has been successfully developed at the Los Alamos Nuclear Science Center (LANSCE) to utilize a spatially and temporally prepared 800-MeV proton beam to produce proton radiographs. A series of proton bursts are transmitted through a dynamically varying object and transported, via a unique magnetic lens system, to an image plane. The magnetic lens system permits correcting for the effects of multiple coulomb scattering which would otherwise completely blur the spatially transmitted… more
Date: December 1, 1998
Creator: King, N.S.P.; Adams, K. & Ables, E.
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129Iodine: a new tracer for surface water/groundwater interaction

Description: We measured <sup>129</sup>I/<sup>127</sup>I ratios in about 30 major rivers and found a strong signal of anthropogenic <sup>129</sup>I in all of them (Moran et al., 1998). The effect of local point sources ,such as the Savannah River Facility and Hanford Facility are easily observed in the Savannah and Columbia Rivers, respectively. Likewise, the Rhine and Rhone rivers in Switzerland, have ratios well above �background� due to their proximity to the main global source in northwest Europe. Away … more
Date: December 1, 1998
Creator: Hoehn, E; Oktay, S & Santschi, P H
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open access

1998 Annual Report - Environmental Restoration Division

Description: This is a 1998 annual report for Environmental Restoration. Environmental Restoration's accomplishments were significant in 1998. The division, including its support organizations, completed one year without a lost time accident. It also met 111 enforceable agreement milestones on time, with more than 80% ahead of schedule. Funds used to meet these milestones were effectively utilized and $9.63 million in regulatory scope was added. Twelve new, innovative technologies were deployed, enabling ER… more
Date: December 30, 1998
Creator: Davis, L.B.
Item Type: Refine your search to only Report
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

1998 Pacific Northwest Loads and Resources Study: The White Book.

Description: The Pacific Northwest Loads and Resources Study (White Book) is published annually by BPA and establishes the planning basis for supplying electricity to customers. It serves a dual purpose. First, the White Book presents projections of regional and Federal system load and resource capabilities, along with relevant definitions and explanations. Second, the White Book serves as a benchmark for annual BPA determinations made pursuant to the 1981 regional power sales contracts. Specifically, BPA u… more
Date: December 1, 1998
Creator: United States. Bonneville Power Administration.
Item Type: Refine your search to only Report
open access

2D neural hardware versus 3D biological ones

Description: This paper will present important limitations of hardware neural nets as opposed to biological neural nets (i.e. the real ones). The author starts by discussing neural structures and their biological inspirations, while mentioning the simplifications leading to artificial neural nets. Going further, the focus will be on hardware constraints. The author will present recent results for three different alternatives of implementing neural networks: digital, threshold gate, and analog, while the are… more
Date: December 1998
Creator: Beiu, V.
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open access

Absolute Intensities of the Vacuum Ultraviolet Spectra in a Metal-Etch Plasma Processing Discharge

Description: In this paper we report absolute intensities of vacuum ultraviolet and near ultraviolet emission lines (4.8 eV to 18 eV ) for aluminum etching discharges in an inductively coupled plasma reactor. We report line intensities as a function of wafer type, pressure, gas mixture and rf excitation level. IrI a standard aluminum etching mixture containing C12 and BC13 almost all the light emitted at energies exceeding 8.8 eV was due to neutral atomic chlorine. Optical trapping of the WV radiation in th… more
Date: December 9, 1998
Creator: Woodworth, J. R.; Blain, M. G.; Jarecki, R. L.; Hamilton, T. W. & Aragon, B. P.
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open access

Accelerated Durability Testing of Electrochromic Windows

Description: Prototype electrochromic windows made by several different U.S. companies have been tested in our laboratory for their long-term durability. Samples were subjected to alternate coloring and bleaching voltage cycles while exposed to simulated on 1-sun irradiance in a temperature-controlled environmental chamber with low relative humidity. The samples inside the chamber were tested under a matrix of different conditions. These conditions include: cycling at different temperatures (65 C, 85 C, and… more
Date: December 29, 1998
Creator: Tracy, C. E.; Zhang, J. G.; Benson, D. K.; Czanderna, A. W. & Deb, S. K.
Item Type: Refine your search to only Article
open access

Acceleration of polarized proton beams

Description: The acceleration of polarized beams in circular accelerators is complicated by the numerous depolarizing spin resonances. Using a partial Siberian snake and a rf dipole that ensure stable adiabatic spin motion during acceleration has made it possible to accelerate polarized protons to 25 GeV at the Brookhaven AGS. Full Siberian snakes are being developed for RHIC to make the acceleration of polarized protons to 250 GeV possible. A similar scheme is being studied for the 800 GeV HERA proton acce… more
Date: December 31, 1998
Creator: Roser, T.
Item Type: Refine your search to only Article
open access

Accelerator production of tritium 700 MHz and 350 MHz klystron test results

Description: The Accelerator Production of Tritium project (APT) utilizes a 1,700 MeV, 100 mA proton Linac. The radio frequency (RF) power is provided by 244 continuous wave (CW) klystron amplifiers at 350 MHz and 700 MHz. All but three of the klystrons operate at a frequency of 700 MHz. The 350 MHz klystrons have a nominal output power of 1.2 MW at a DC-to-RF conversion efficiency of 65%. They are modulating-anode klystrons and operate at a beam voltage and current of 95 kV and 20 A. The design is based on… more
Date: December 31, 1998
Creator: Rees, D.; Lynch, M. & Tallerico, P.
Item Type: Refine your search to only Report
open access

Accomplishments of the American-Polish Program for Elimination of Low Emissions in Krakow

Description: Since 1990 the US Department of Energy (DOE) has been involved in a program aimed at reducing air pollution caused by small, coal-fired sources in Poland. The activity is focused on the city of Cracow, Poland with the intention that results will be applicable and extendable to the entire region. The effort under this program has been focused into 5 main areas of interest as follows: (1) energy conservation and extension of central station district heating; (2) replacement of coal- and coke-fire… more
Date: December 31, 1998
Creator: Butcher, T. A. & Pierce, B.
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open access

Accretion onto black holes: The power generating mechanism

Description: This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The physical relationships among accretion disks, quasars, black holes, collimated radio sources and galactic dynamos previously has been only weakly related without explicit cause and effect. We have constructed a physical evolution from large, primordial density perturbations to {open_quotes}damped Lyman alpha clouds,{close_quotes} to galaxy formation… more
Date: December 31, 1998
Creator: Colgate, S.A.; Hills, J.G. & Miller, W.A.
Item Type: Refine your search to only Report
open access

Accurate polyatomic quantum dynamics studies of combustion reactions. Final progress report, July 1, 1994--June 30, 1998

Description: This program is designed to develop accurate yet practical computational methods, primarily based on time-dependent quantum mechanics, for studying the dynamics of polyatomic reactions beyond the atom-diatom systems. Efficient computational methodologies are developed and the applications of these methods to practical chemical reactions relevant to combustion processes are carried out. The program emphasizes the practical aspects of accurate quantum dynamics calculations in order to understand,… more
Date: December 31, 1998
Creator: Zhang, J. Z. H.
Item Type: Refine your search to only Report
open access

Achieving 800kW CW Beam Power and Continuing Energy Improvements in CEBAF

Description: During the past year, CEBAF at Jefferson Lab has demonstrated its full capacity of sustained 800 kW beam power. All systems performed as intended. The energy stability at the design parameters of 4.0 GeV, 200 muA CW beam was measured to be better than 3x10{sup -5} rms. During the fall of 1997, physics experiments were conducted using 4.4 GeV beam. Having demonstrated the benefits of in situ helium/rf processing of SRF cavities for increasing the energy reach of CEBAF, we began a program of proc… more
Date: December 1, 1998
Creator: Reece, Charlie
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open access

Achieving Sustainable Construction in Affordable Housing

Description: An energy-efficient design and construction checklist and information sheets on energy-efficient design and construction are two products being developed. These products will help affordable housing providers take the first steps toward a whole-house approach to the design and implementation of energy-efficient construction practices. The checklist presents simple and clear guidance on energy improvements that can be readily addressed now by most affordable housing providers. The information sh… more
Date: December 7, 1998
Creator: Barcik, M. K.; Creech, D. B. & Ternes, M. P.
Item Type: Refine your search to only Article
open access

Acid-Base Interactions at the Molecular Level: Adhesion and Friction Studies with Interfacial Force Microscopy

Description: To examine the forces of acid-base adhesive interactions at the molecular level, we utilize the scanning probe Interracial Force Microscope (IFM). Unlike cantilever-based atomic force microscopes, the EM is a non-compliant, mechanically stable probe that provides a complete adhesive profile without jump-to-contact. In this way, we are able to quantitatively measure the work of adhesion and bond energies at well-defined, nanometer-scale single asperity contacts. In particular, we will discuss th… more
Date: December 9, 1998
Creator: Burns, A. R.; Carpick, R. W.; Houston, J. E. & Michalske, T. A.
Item Type: Refine your search to only Article
open access

Acousto-optically tuned isotopic CO{sub 2} lasers for long-range differential absorption LIDAR

Description: The authors are developing 2--100 kHz repetition rate CO{sub 2} lasers with milliJoule pulse energies, rapid acousto-optic tuning and isotopic gas mixes, for Differential Absorption LIDAR (DIAL) applications. The authors explain the tuning method, which uses a pair of acousto-optic modulators and is capable of random access to CO{sub 2} laser lines at rates of 100 kHz or more. The laser system is also described, and they report on performance with both normal and isotopic gas mixes.
Date: December 1, 1998
Creator: Thompson, D. C.; Busch, G. E.; Hewitt, C. J.; Remelius, D. K.; Shimada, Tsutomu; Strauss, C. E. M. et al.
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Actinide biocolloid formation in brine by halophilic bacteria

Description: The authors examined the ability of a halophilic bacterium (WIPP 1A) isolated from the Waste Isolation Pilot Plant (WIPP) site to accumulate uranium in order to determine the potential for biocolloid facilitated actinide transport. The bacterial cell surface functional groups involved in the complexation of the actinide were determined by titration. Uranium, added as uranyl nitrate, was removed from solution at pH 5 by cells but at pH 7 and 9 very little uranium was removed due to its limited s… more
Date: December 31, 1998
Creator: Gillow, J. B.; Francis, A. J.; Dodge, C. J.; Harris, R.; Beveridge, T. J.; Brady, P. V. et al.
Item Type: Refine your search to only Report
open access

Active noise and vibration control for vehicular applications

Description: This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). This project investigated semi-active suspension systems based on real time nonlinear control of magneto-rheological (MR) shock absorbers. This effort was motivated by Laboratory interactions with the automobile industry and with the Defense Department. Background research and a literature search on semi-active suspensions was carried out. Numerical s… more
Date: December 31, 1998
Creator: Lewis, P.S. & Ellis, S.
Item Type: Refine your search to only Report
open access

Active voltammetric microsensors with neural signal processing.

Description: Many industrial and environmental processes, including bioremediation, would benefit from the feedback and control information provided by a local multi-analyte chemical sensor. For most processes, such a sensor would need to be rugged enough to be placed in situ for long-term remote monitoring, and inexpensive enough to be fielded in useful numbers. The multi-analyte capability is difficult to obtain from common passive sensors, but can be provided by an active device that produces a spectrum-… more
Date: December 11, 1998
Creator: Vogt, M. C.
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open access

Adapting perspectives to facilitate knowledge assimilation

Description: The notion of perspective when supported in knowledge representation can allow the representation of multiple and varying points of view, some of which may even be inconsistent with one another. In an object-based knowledge representation methodology created and used by the authors, a perspective is defined by consolidating a number of objects and a number of those objects` associated attributes and methods into a view. This view can help partition a knowledge domain into separate portions. A s… more
Date: December 31, 1998
Creator: Kelsey, R.L. & Webster, R.B.
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open access

Adaptive feedforward of estimated ripple improves the closed loop system performance significantly

Description: The Low Energy Demonstration Accelerator (LEDA) being constructed at Los Alamos National Laboratory will serve as the prototype for the low energy section of Acceleration Production of Tritium (APT) accelerator. This paper addresses the problem of LLRF control system for LEDA. The authors propose an estimator of the ripple and its time derivative and a control law which is based on PID control and adaptive feedforward of estimated ripple. The control law reduces the effect of the deterministic … more
Date: December 31, 1998
Creator: Kwon, S.; Regan, A.; Wang, Y. M. & Rohlev, T.
Item Type: Refine your search to only Article
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