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Thyratron characteristics under high di/dt and high-repetition-rate operation

Description: Power conditioning systems for high peak and average power, high repetition rate discharge excited lasers involve operation of modulator components in unconventional regimes. Reliable operation of switches and energy storage elements under high voltage and high di/dt conditions is a pacing item for laser development at the present time. To test and evaluate these components a Modulator Component Test Facility (MCTF) was constructed. The MCTF consists of a command charge system, energy storage c… more
Date: May 11, 1981
Creator: Ball, D.; Hill, J. & Kan, T.
Partner: UNT Libraries Government Documents Department
open access

U.S. Aims for Zero-Energy: Support for PV on New Homes

Description: As a market segment for solar photovoltaic (PV) adoption, new homes have a number of attractive attributes. Homebuyers can easily roll the cost of the PV system into their mortgage and, with rebates or other financial incentives, potentially realize an immediate net positive cash flow from the investment. PV system performance can be optimized by taking roof orientation, shading, and other structural factors into account in the design of new homes. Building-integrated photovoltaics (BIPV), whic… more
Date: May 11, 2006
Creator: Barbose, Galen; Wiser, Ryan & Bolinger, Mark
Partner: UNT Libraries Government Documents Department
open access

Experimental Determination of Apery-Like Identities forZeta(2n+2)

Description: We document the discovery of two generating functions forzeta(2n+2), analogous to earlier work for zeta(2n+1) and zeta(4n+3),initiated by Koecher and pursued further by Borwein, Bradley andothers.
Date: May 11, 2005
Creator: Bailey, David H.; Borwein, Jonathan M. & Bradley, David M.
Partner: UNT Libraries Government Documents Department
open access

Qualification of Automated Low-Field NMR Relaxometry for Quality Control of Polymers in a Production Setting

Description: Implementation of a low field time-domain NMR scanner as a diagnostic tool in the production of new polymer components is described in the context of qualification of a new QA/QC device. A study to determine the optimal experimental parameters was performed and a robotic autosampler was built to enable scanning of multiple pads. Relationships between T{sub 2} values and physical properties of DC745 slabs were investigated, and the appropriate sampling parameters for the production setting were … more
Date: May 11, 2007
Creator: Chinn, S; Cook-Tendulkar, A; Maxwell, R; Wheeler, H; Wilson, M & Xie, Z
Partner: UNT Libraries Government Documents Department
open access

Rapid, Absolute Calibration of X-ray Filters Employed By Laser-Produced Plasma Diagnostics

Description: The electron beam ion trap (EBIT) facility at the Lawrence Livermore National Laboratory is being used to absolutely calibrate the transmission efficiency of X-ray filters employed by diodes and spectrometers used to diagnose laser-produced plasmas. EBIT emits strong, discrete monoenergetic lines at appropriately chosen X-ray energies. X-rays are detected using the high-resolution EBIT calorimeter spectrometer (ECS), developed for LLNL at the NASA/Goddard Space Flight Center. X-ray filter trans… more
Date: May 11, 2008
Creator: Brown, G. V.; Beiersdorfer, P.; Emig, J.; Frankel, M.; Gu, M. F.; Heeter, R. F. et al.
Partner: UNT Libraries Government Documents Department
open access

Zinc Single Crystal Deformation Experiments using a "6 Degrees of Freedom" Apparatus

Description: A new experimental technique to study crystallographic slip system activity in metallic single crystals deformed under a condition of uniaxial stress is applied to study the behavior of Zn single crystals. The experimental apparatus allows essentially unconstrained shape change of inherently anisotropic materials under a condition of uniaxial stress by allowing 3 translational and 3 rotational degrees of freedom during compression; hence we have named the experiment 6 degrees of freedom (6DOF).… more
Date: May 11, 2006
Creator: Lassila, D. H.; LeBlanc, M. M. & Florando, J. N.
Partner: UNT Libraries Government Documents Department
open access

Nova Event Logging System

Description: Nova is a 200 terawatt, 10-beam High Energy Glass Laser currently under construction at LLNL. This facility, designed to demonstrate the feasibility of laser driven inertial confinement fusion, contains over 5000 elements requiring coordinated control, data acquisition, and analysis functions. The large amounts of data that will be generated must be maintained over the life of the facility. Often the most useful but inaccessible data is that related to time dependent events associated with, for… more
Date: May 11, 1981
Creator: Calliger, R.J. & Suski, G.J.
Partner: UNT Libraries Government Documents Department
open access

Small t Physics at the TEVATRON Collider

Description: The first physics run of the superconducting Tevatron Collider at Fermilab ended this morning. A status report will be presented on the progress of the small angle elastic scattering and total cross section experiment, E710. The goals of this experiment are to measure the total proton-antiproton cross section from ..sqrt..s = 300 to 2000 GeV, the slope of the diffraction peak and rho, the ratio of the real to imaginary part of the forward scattering amplitude, at these energies. 1 ref., 8 figs.
Date: May 11, 1987
Creator: Bertani, M.; Giacomalli, G.; Maleyran, R.; Manarin, A.; Amos, N.; DeSalvo, R. et al.
Partner: UNT Libraries Government Documents Department
open access

ATOMLLL: atoms with shading and highlights

Description: The ATOMS program, written at Bell Telephone Laboratory, is capable of determining the visible portions of a scene consisting of interpenetrating spheres and cylinders, put together to represent space-filling or ball-and-stick molecular models. The Lawrence Livermore Laboratory version contains enhancements to add shading and highlights, and to render the spheres on film as ellipses, so they will appear round when projected in various wide-screen formats. The visible parts of each sphere or cyl… more
Date: May 11, 1979
Creator: Max, N.L.
Partner: UNT Libraries Government Documents Department
open access

Equivalence of two formalisms for calculating higher order synchrotron sideband spin resonances

Description: Synchrotron sideband resonances of a first order spin resonance are generally regarded as the most important higher order spin resonances in a high-energy storage ring. Yokoya's formula for these resonances is rederived, including some extra terms, which he neglected, but which turn out to be of comparable magnitude to the terms retained. Including these terms, Yokoya's formalism and the SMILE algorithm are shown to be equivalent to leading order in the resonance strengths. The theoretical calc… more
Date: May 11, 1988
Creator: Mane, S.R.
Partner: UNT Libraries Government Documents Department
open access

Computational method for realistic estimates of the dose to active marrow

Description: Calculation of absorbed dose to active marrow from photon radiation is a complex problem because electronic equilibrium may not exist in the vicinity of soft tissue-bone mineral interfaces. Snyder et al. recognized the intractable geometry of trabecular bone in their studies of photon transport in the body and formulated marrow dose estimates in a conservative manner. Other investigators have noted that this approach leads to overestimate by factors of 3 or more at low photon energy. In this pa… more
Date: May 11, 1984
Creator: Eckerman, K.F. & Cristy, M.
Partner: UNT Libraries Government Documents Department
open access

What Do We Know About Ethanol and Alkylates as Pollutants?

Description: Gov. Davis issued Executive Order D-5-99 in March 1999 calling for removal of methyl tertiary butyl ether (MTBE) from gasoline no later than December 31, 2002. The Executive Order required the California Air Board, State Water Resources Control Board (SWRCB) and Office of Environmental Health Hazard Assessment (OEHHA) to prepare an analysis of potential impacts and health risks that may be associated with the use of ethanol as a fuel oxygenate. The SWRCB contracted with the Lawrence Livermore N… more
Date: May 11, 2001
Creator: Rich, D W; Marchetti, A A; Buscheck, T & Layton, D W
Partner: UNT Libraries Government Documents Department
open access

Multi-Tube Power Leads Tower for Bepcii Ir Magnets.

Description: A power lead tower containing the multi-tube power leads is designed and under fabrication for the superconducting IR quadrupole magnets in the Beijing Electron Position Collider Upgrade (BEPCII). The lead tower consists of six pairs of gas-cooled leads for seven superconducting coils at various operating currents. The power lead is designed in a modular fashion, which can be easily applied to suit different operating current. The end copper block of the tube lead has a large cold mass that pro… more
Date: May 11, 2004
Creator: Jia, L. X.; Zhang, X. B.; Wang, L.; Wang, T. H. & Yao, Z. L.
Partner: UNT Libraries Government Documents Department
open access

HCCI engine control by thermal management

Description: This work investigates a control system for HCCI engines, where thermal energy from exhaust gas recirculation (EGR) and compression work in the supercharger are either recycled or rejected as needed. HCCI engine operation is analyzed with a detailed chemical kinetics code, HCT (Hydrodynamics, Chemistry and Transport), that has been extensively modified for application to engines. HCT is linked to an optimizer that determines the operating conditions that result in maximum brake thermal efficien… more
Date: May 11, 2000
Creator: Martinez-Frias, J; Aceves, S M; Flowers, D; Smith, J R & Dibble, R
Partner: UNT Libraries Government Documents Department
open access

Thermal Fluid Modeling of Bepcii Ir Quadrupole Magnet Cryostat.

Description: A pair of superconducting interaction region quadrupole magnets for BEPCII was designed and fabricated at Brookhaven National Laboratory, USA. The cryogenic system for the IR magnets was designed at Harbin Institute of Technology, China. This paper provides the results of thermal fluid modeling for the magnet cryostat. The numerical analyses were carried out for two types of cooling methods, the subcooled liquid helium and the supercritical helium flow. The pressure and temperature changes in t… more
Date: May 11, 2004
Creator: Wang, L.; Tang, H. M.; Zhang, X. B.; Yang, G. D. & Jia, L. X.
Partner: UNT Libraries Government Documents Department
open access

Dynamical evolution of cosmic strings

Description: The author have studied by means of numerical simulations the dynamical evolution of a network of cosmic strings, both in the radiation and matter era. Our basic conclusion is that a scaling solution exists, i.e., the string energy density evolves as t/sup -2/. This means that the process by which long strings dump their energy into closed loops (which can gravitationally radiate away) is efficient enough to prevent the string domination over other forms of energy. This conclusion does not depe… more
Date: May 11, 1988
Creator: Bouchet, F. R.
Partner: UNT Libraries Government Documents Department
open access

An imaging proton spectrometer for short-pulse laser plasma experiments

Description: Ultra intense short pulse laser pulses incident on solid targets can generate energetic protons. In additions to their potentially important applications such as in cancer treatments and proton fast ignition, these protons are essential to understand the complex physics of intense laser plasma interaction. To better characterize these laser-produced protons, we designed and constructed a novel, spatially imaging proton spectrometer that will not only measure proton energy distribution with high… more
Date: May 11, 2010
Creator: Chen, H.; Hazi, A.; van Maren, R.; Chen, S.; Fuchs, J.; Gauthier, M. et al.
Partner: UNT Libraries Government Documents Department
open access

Non-linear scale invariance in a cold-dark-matter universe

Description: The observed decomposition of the lowest (N = 3,4) N-point correlation functions in symmetrized (N - 1) products of two-point correlation functions suggest the possibility that the Universe may obey a specific scale invariance, at least in some range. Assuming that this scale invariance is strictly verified for all N, some specific predictions concerning the void probability function P(sub O), and more generally the count probabilities P(sub N), as well as the fractal dimensions of the system c… more
Date: May 11, 1988
Creator: Bouchet, F. R.
Partner: UNT Libraries Government Documents Department
open access

COMPACTION OF FIBERBOARD IN A 9975 SHIPPING PACKAGE

Description: Compaction of lower layers in the fiberboard overpack has been observed in 9975 packages that contain elevated moisture. Lab testing has resulted in a better understanding of (1) the relationship between the fiberboard moisture level and compaction of the lower fiberboard assembly, and (2) the behavior of the fiberboard during transport. In laboratory tests, higher moisture content has been shown to correspond to higher total compaction of fiberboard material, greater rate of compaction, and co… more
Date: May 11, 2011
Creator: Stefek, T.; Daugherty, W.; Estochen, E. & Leduc, D.
Partner: UNT Libraries Government Documents Department
open access

Targeted Discovery of Glycoside Hydrolases from a Switchgrass-Adapted Compost Community

Description: Development of cellulosic biofuels from non-food crops is currently an area of intense research interest. Tailoring depolymerizing enzymes to particular feedstocks and pretreatment conditions is one promising avenue of research in this area. Here we added a green-waste compost inoculum to switchgrass (Panicum virgatum) and simulated thermophilic composting in a bioreactor to select for a switchgrass-adapted community and to facilitate targeted discovery of glycoside hydrolases. Smallsubunit (SS… more
Date: May 11, 2011
Creator: Reddy, Amitha; Allgaier, Martin; Park, Joshua I.; Ivanoval, Natalia; Dhaeseleer, Patrik; Lowry, Steve et al.
Partner: UNT Libraries Government Documents Department
open access

Steam Reforming on Transition-metal Carbides from Density-functional Theory

Description: A screening study of the steam reforming reaction on clean and oxygen covered early transition-metal carbides surfaces is performed by means of density-functional theory calculations. It is found that carbides provide a wide spectrum of reactivities, from too reactive via suitable to too inert. Several molybdenum-based systems are identified as possible steam reforming catalysts. The findings suggest that carbides provide a playground for reactivity tuning, comparable to the one for pure metals. more
Date: May 11, 2012
Creator: Vojvodic, Aleksandra
Partner: UNT Libraries Government Documents Department
open access

The Radiochemical Analysis of Gaseous Samples (RAGS) Apparatus for Nuclear Diagnostics at the National Ignition Facility

Description: The RAGS (Radiochemical Analysis of Gaseous Samples) diagnostic apparatus was recently installed at the National Ignition Facility. Following a NIF shot, RAGS is used to pump the gas load from the NIF chamber for purification and isolation of the noble gases. After collection, the activated gaseous species are counted via gamma spectroscopy for measurement of the capsule areal density and fuel-ablator mix. Collection efficiency was determined by injecting a known amount of {sup 135}Xe into the … more
Date: May 11, 2012
Creator: Shaughnessy, D A; Velsko, C A; Jedlovec, D R; Yeamans, C B; Moody, K J; Tereshatov, E et al.
Partner: UNT Libraries Government Documents Department
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