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Tests of proton structure functions using leptons at CDF and D0: W charge asymmetry and Drell-Yan production. Version 1.0

Description: High statistics W charge asymmetry measurements at the Tevatron {bar p}p collider significantly constrain the u and d quark distributions, and specifically the slope of the d(x)/u(x) in the x range 0.007 to 0.27. The authors present measurements of lepton charge asymmetry as a function of lepton rapidity, A(y{sub l}) at {radical}s = 1.8 TeV for {vert_bar}y{sub l}{vert_bar} < 2.0, for the W decays to electrons and muons recorded by the CDF detector during the 1992-93 run ({approx} 20 pb{sup {min… more
Date: June 13, 1995
Creator: de Barbaro, P.
Partner: UNT Libraries Government Documents Department
open access

Combustion of n-heptane in a shock tube and in a stirred reactor: A detailed kinetic modeling study

Description: A detailed chemical kinetic reaction mechanism is used to study the oxidation of n-heptane under several classes of conditions. Experimental results from ignition behind reflected shock waves and in a rapid compression machine were used to develop and validate the reaction mechanism at relatively high temperatures, while data from a continuously stirred tank reactor (cstr) were used to refine the low temperature portions of the reaction mechanism. In addition to the detailed kinetic modeling, a… more
Date: April 13, 1995
Creator: Gaffuri, P.; Curran, H.J.; Pitz, W.J. & Westbrook, C.K.
Partner: UNT Libraries Government Documents Department
open access

Middle Urals` pollution prevention priorities assessment project

Description: The Middle Urals is an important Russian industrial region. The key industries are also the most environmentally damaging: mining, metallurgical and chemical industries. There are some 600 large-sized and medium-sized enterprises located within the Middle Urals` region. Their annual solid and gaseous chemical releases have led to exceeding some maximum permissible contaminant concentrations by factors of tens and hundreds. The environmental problems of the Middle Urals are of such magnitude, se… more
Date: September 13, 1995
Creator: Gonzalez, M.; Ott, R.L. & Chukanov, V.
Partner: UNT Libraries Government Documents Department
open access

Development of a Transportable Vitrification System for Mixed Waste

Description: The US DOE through the Mixed Waste Integrated Program, has identified a need to move mixed waste vitrification technology from the laboratory to the field as rapidly as possible. A great deal of work over the last few years has shown the feasibility of immobilizing selected hazardous waste streams in a vitrified product. Lab-scale work has been extended to pilot-scale tests, usually with surrogates of the actual waste. DOE felt that the technology was mature enough to allow demonstration in the… more
Date: January 13, 1995
Creator: Whitehouse, J. C.; Jantzen, Carol M.; Bickford, D. F.; Kielpinski, A. L.; Helton, B. D. & Van Ryn, F.
Partner: UNT Libraries Government Documents Department
open access

Modeling precipitation from concentrated solutions with the EQ3/6 chemical speciation codes

Description: One of the more important uncertainties of using chemical speciation codes to study dissolution and precipitation of compounds is the results of modeling which depends on the particular thermodynamic database being used. The authors goal is to investigate the effects of different thermodynamic databases on modeling precipitation from concentrated solutions. They used the EQ3/6 codes and the supplied databases to model precipitation in this paper. One aspect of this goal is to compare prediction… more
Date: January 13, 1995
Creator: Brown, L. F. & Ebinger, M. H.
Partner: UNT Libraries Government Documents Department
open access

A modelling study of the combustion of n-heptane and iso-octane in a high pressure turbulent flow reactor

Description: The primary reference fuels n-heptane and iso-octane and their mixtures are used as a measure of the tendency of a given automotive fuel to cause knocking or pre-ignition in an internal combustion engine. Consequently, many experimental studies have been performed on these hydrocarbons in an attempt to better understand their oxidation. Shock tube studies at high temperature and pressure have been performed. Low temperature studies, in which species concentration profiles of primary, intermedia… more
Date: April 13, 1995
Creator: Curran, H.J.; Gaffuri, P.; Pitz, W.J.; Westbrook, C.K.; Callahan, C.; Dryer, F.L. et al.
Partner: UNT Libraries Government Documents Department
open access

Waste Minimization Measurement and Progress Reporting

Description: Westinghouse Savannah River Company is implementing productivity improvement concepts into the Waste Minimization Program by focusing on the positive initiatives taken to reduce waste generation at the Savannah River Site. Previous performance measures, based only on waste generation rates, proved to be an ineffective metric for measuring performance and promoting continuous improvements within the Program. Impacts of mission changes and non-routine operations impeded development of baseline wa… more
Date: February 13, 1995
Creator: Stone, K.A.
Partner: UNT Libraries Government Documents Department
open access

Risk from a compressed toxic gas system: Part 1, Dispersal probability

Description: At the Lawrence Livermore National Laboratory, we have prepared a Safety Analysis Report for the Department of Energy on our Building 332 Plutonium Handling Facility. This SAR includes an analysis of potential accident scenarios which could lead to offsite consequences to the public having not only radiological exposures, but also exposures to toxic gases such as chlorine. This paper presents a risk analysis of pressurized chlorine gas system proposed for use at Building 332. The focus of the a… more
Date: February 13, 1995
Creator: Altenbach, T.J. & Brereton, S.J.
Partner: UNT Libraries Government Documents Department
open access

Single parameter controls for nuclear criticality safety at the Oak Ridge Y-12 Plant

Description: At the Oak Ridge Y-12 Plant, there are numerous situations in which nuclear criticality safety must be assured and subcriticality demonstrated by some method other than the straightforward use of the double contingency principle. Some cases are cited, and the criticality safety evaluation of contaminated combustible waste collectors is considered in detail. The criticality safety evaluation for combustible collectors is based on applying one very good control to the one controllable parameter. … more
Date: January 13, 1995
Creator: Baker, J.S. & Peek, W.M.
Partner: UNT Libraries Government Documents Department
open access

A comparison of risk assessment techniques from qualitative to quantitative

Description: Risk assessment techniques vary from purely qualitative approaches, through a regime of semi-qualitative to the more traditional quantitative. Constraints such as time, money, manpower, skills, management perceptions, risk result communication to the public, and political pressures all affect the manner in which risk assessments are carried out. This paper surveys some risk matrix techniques, examining the uses and applicability for each. Limitations and problems for each technique are presente… more
Date: February 13, 1995
Creator: Altenbach, T.J.
Partner: UNT Libraries Government Documents Department
open access

Imaging radar for bridge deck inspection

Description: Lawrence Livermore National Laboratory (LLNL)l is developing a prototype imaging radar for inspecting steel reinforced concrete bridge decks. The system is designed to acquire Synthetic Aperture Radar (SAR) data and provide high-resolution images of internal structure, flaws, and defects enabling bridge inspectors to nondestructively evaluate and characterize bridge deck condition. Concrete delamination resulting from corrosion of steel reinforcing bars (rebars) is an important structural defec… more
Date: April 13, 1995
Creator: Warhus, J.; Mast, J. & Nelson, S.
Partner: UNT Libraries Government Documents Department
open access

Investigation of acoustic emission for use as a wheel-to-workpiece proximity sensor in fixed-abrasive grinding

Description: This paper reports on the feasibility of using Acoustic Emission (AE) for sensing the proximity of a grinding wheel to a glass workpiece, both prior to contact and in the early stages of contact. Our measured AE signals indicate that we can track the position of the grinding wheel as it approaches the workpiece through the turbulent coolant layer and than as contact initiates with a workpiece during spherical generation. Our data for the initial contact region is dominated by cyclical bursts of… more
Date: September 13, 1995
Creator: Taylor, J. S.; Piscotty, M. A. & Dornfeld, D. A.
Partner: UNT Libraries Government Documents Department
open access

Microscopic time-reversibility and macroscopic irreversibility: Still a paradox

Description: Microscopic time reversibility and macroscopic irreversibility are a paradoxical combination. This was first observed by J. Loschmidt in 1876 and was explained, for conservative systems, by L. Boltzmann the following year. Both these features are also present in modern simulations of classic many-body systems in steady nonequilibrium states. We illustrate them here for the simplest possible models, a continuous one-dimensional model of field-driven diffusion, the so-called driven Lorentz gas or… more
Date: September 13, 1995
Creator: Posch, H. A.; Dellago, Ch.; Hoover, W. G. & Kum, O.
Partner: UNT Libraries Government Documents Department
open access

Rapid mapping of volumetric errors

Description: This paper describes a relatively inexpensive, fast, and easy to execute approach to mapping the volumetric errors of a machine tool, coordinate measuring machine, or robot. An error map is used to characterize a machine or to improve its accuracy by compensating for the systematic errors. The method consists of three steps: (1) modeling the relationship between the volumetric error and the current state of the machine; (2) acquiring error data based on length measurements throughout the work v… more
Date: September 13, 1995
Creator: Krulewich, D.; Hale, L. & Yordy, D.
Partner: UNT Libraries Government Documents Department
open access

Meteorological forecasting for emergency preparedness and response at the Kennedy Space Center of Florida

Description: The NORAPS model has been used to simulate the motion of Hurricane Erin over Florida. A triplynested grid was used to capture the meteorological features which span from regional to local scales with the highest resolution nest centered at the Kennedy Space Center area. The simulated storm track agreed remarkably well with the observed path of the hurricane. There was also good qualitative agreement between the computed surface precipitation pattern and observations based on radar signatures. A… more
Date: October 13, 1995
Creator: Lee, R. L.; Albritton, J. R.; Ermak, D. L.; Hodur, R. & Liou, C. S.
Partner: UNT Libraries Government Documents Department
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