31 Matching Results

Search Results

Results: 1 - 24 next
open access

Further Tests of Changes in Fish Escape Behavior Resulting from Sublethal Stresses Associated with Hydroelectric Turbine Passage

Description: Fish that pass through a hydroelectric turbine may not be killed directly, but may nonetheless experience sublethal stresses that will increase their susceptibility to predators (indirect mortality). There is a need to develop reliable tests for indirect mortality so that the full consequences of passage through turbines (and other routes around a hydroelectric dam) can be assessed. The most commonly used laboratory technique for assessing susceptibility to predation is the predator preference … more
Date: October 20, 2004
Creator: Ryon, M.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Deliquescence of NaCl-NaNO3, KNO3-NaNO3, and NaCl-KNO3 Salt Mixtures From 90 to 120?C

Description: We conducted reversed deliquescence experiments in saturated NaCl-NaNO{sub 3}-H{sub 2}O, KNO{sub 3}-NaNO{sub 3}-H{sub 2}O, and NaCl-KNO{sub 3}-H{sub 2}O systems from 90 to 120 C as a function of relative humidity and solution composition. NaCl, NaNO{sub 3}, and KNO{sub 3} represent members of dust salt assemblages that are likely to deliquesce and form concentrated brines on high-level radioactive waste package surfaces in a repository environment at Yucca Mountain, NV, USA. Discrepancy between… more
Date: October 20, 2004
Creator: Carroll, S A; Craig, L & Wolery, T J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An embedded boundary method for viscous, conducting compressibleflow

Description: The evolution of an Inertial Fusion Energy (IFE) chamberinvolves a repetition of short, intense depositions of energy (fromtarget ignition) into a reaction chamber, followed by the turbulentrelaxation of that energy through shock waves and thermal conduction tothe vessel walls. We present an algorithm for 2D simulations of the fluidinside an IFE chamber between fueling repetitions. Our finite-volumediscretization for the Navier-Stokes equations incorporates a Cartesiangrid treatment for irregul… more
Date: October 20, 2004
Creator: Dragojlovic, Zoran; Najmabadi, Farrokh & Day, Marcus
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Cycles in fossil diversity

Description: It is well-known that the diversity of life appears to fluctuate during the course the Phanerozoic, the eon during which hard shells and skeletons left abundant fossils (0-542 Ma). Using Sepkoski's compendium of the first and last stratigraphic appearances of 36380 marine genera, we report a strong 62 {+-} 3 Myr cycle, which is particularly strong in the shorter-lived genera. The five great extinctions enumerated by Raup and Sepkoski may be an aspect of this cycle. Because of the high statistic… more
Date: October 20, 2004
Creator: Rohde, Robert A. & Muller, Richard A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Molecular environmental science : an assessment of research accomplishments, available synchrotron radiation facilities, and needs.

Description: Synchrotron-based techniques are fundamental to research in ''Molecular Environmental Science'' (MES), an emerging field that involves molecular-level studies of chemical and biological processes affecting the speciation, properties, and behavior of contaminants, pollutants, and nutrients in the ecosphere. These techniques enable the study of aqueous solute complexes, poorly crystalline materials, solid-liquid interfaces, mineral-aqueous solution interactions, microbial biofilm-heavy metal inte… more
Date: October 20, 2004
Creator: Brown, G. E., Jr.; Sutton, S. R.; Bargar, J. R.; Shuh, D. K.; Fenter, P. A. & Kemner, K. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ASSESSMENT OF GENOTOXIC ACTIVITY OF PETROLEUM HYDROCARBON-BIOREMEDIATED SOIL

Description: The relationship between toxicity and soil contamination must be understood to develop reliable indicators of environmental restoration for bioremediation. Two bacterial rapid bioassays: SOS chromotest and umu-test with and without metabolic activation (S-9 mixture) were used to evaluate genotoxicity of petroleum hydrocarbon-contaminated soil following bioremediation treatment. The soil was taken from an engineered biopile at the Czor Polish oil refinery. The bioremediation process in the biopi… more
Date: October 20, 2004
Creator: BRIGMON, ROBIN
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

''SMART'' Multifunctional Polymers for Enhanced Oil Recovery

Description: Herein we report the aqueous polymerization of acrylamide using reversible addition fragmentation chain transfer (RAFT) polymerization to perform a comprehensive study on the polymerization of acrylamide. More specifically, the effect of polymerization conditions on the polymerization kinetics, molecular weight control, and blocking ability were examined. With this in mind, it was necessary to prepare ''A'' block (corona of the micelle) from a hydrophilic monomer. The responsive ''B'' block pre… more
Date: October 20, 2004
Creator: McCormick, Charles & Lowe, Andrew
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Defense HLW Glass Degradation Model

Description: The purpose of this report is to document the development of a model for calculating the release rate for radionuclides and other key elements from high-level radioactive waste (HLW) glasses under exposure conditions relevant to the performance of the repository. Several glass compositions are planned for the repository, some of which have yet to be identified (i.e., glasses from Hanford and Idaho National Engineering and Environmental Laboratory). The mechanism for glass dissolution is the sam… more
Date: October 20, 2004
Creator: Strachan, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High Efficiency Amorphous and Microcrystalline Silicon Based Double-Junction Solar Cells made with Very-High-Frequency Glow Discharge

Description: We have achieved a total-area initial efficiency of 11.47% (active-area efficiency of 12.33%) on a-Si:H/μc-Si:H double-junction structure, where the intrinsic layer bottom cell was made in 50 minutes. On another device in which the bottom cell was made in 30 min, we achieved initial total-area efficiency of 10.58% (active-efficiency of 11.35%). We have shown that the phenomenon of ambient degradation of both μc-Si:H single-junction and a-Si:H/μc-Si:H double-junction cells can be attributed to i… more
Date: October 20, 2004
Creator: Banerjee, Arindam
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Effect of Manganese Additions on the Reactive Evaporation of Chromium in Ni-Cr Alloys

Description: Chromium is used as an alloy addition in stainless steels and nickel-chromium alloys to form protective chromium oxide scales. Chromium oxide undergoes reactive evaporation in high temperature exposures in the presence of oxygen and/or water vapor. The deposition of gaseous chromium species onto solid oxide fuel cell electrodes can reduce the efficiency of the fuel cell. Manganese additions to the alloy can reduce the activity of chromium in the oxide, either from solid solution replacement of … more
Date: October 20, 2004
Creator: Holcomb, Gordon R. & Alman, David E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of Fine Particulate Emission Factors and Speciation Profiles for Oil and Gas-Fired Combustion Systems

Description: In 1997, the United States Environmental Protection Agency (EPA) promulgated new National Ambient Air Quality Standards (NAAQS) for particulate matter, including for the first time particles with aerodynamic diameter smaller than 2.5 micrometers ({micro}m) referred to as PM2.5. PM2.5 in the atmosphere also contributes to reduced atmospheric visibility, which is the subject of existing rules for siting emission sources near Class 1 areas and new Regional Haze rules. There are few existing data r… more
Date: October 20, 2004
Creator: England, Glenn C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pulse requirements for electron diffraction imaging of single biological molecules

Description: The pulse requirements for electron diffraction imaging of single biological molecules are calculated. We find that the electron fluence and pulse length requirements imposed by the damage limit and by the need to classify the diffraction patterns according to their angular orientation cannot be achieved with today's electron beam technology. A simple analytical model shows that the pulse requirements cannot be achieved due to beam broadening due to spacecharge effects.
Date: October 20, 2004
Creator: Hau-Riege, S; London, R & Chapman, H
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DETECTION OF TWO MASSIVE CO SYSTEMS IN 4C 41.17 AT z=3.8

Description: We have detected CO(4-3) in the z=3.8 radio galaxy 4C 41.17 with the IRAM Interferometer. The CO is in two massive (M{sub dyn} {approx}> 2.5 x 10{sup 11} M{sub {circle_dot}}) systems separated by 1.8 (13 kpc), and by 400 km s{sup -1} in velocity, which coincide with two different dark lanes in a deep Ly{alpha} image. One CO component coincides with the cm-radio core of the radio galaxy, and its redshift is close to that of the He II {lambda} 1640 AGN line. The second CO component is near the… more
Date: October 20, 2004
Creator: DeBreuck, C; Downes, D; Neri, R; van Breugel, W; Reuland, M; Omont, A et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

New York State Code Adoption Analysis: Lighting Requirements

Description: The adoption of the IECC 2003 Energy code will include a set of Lighting Power Density (LPD) values that are effectively a subset of the values in Addendum g to the ASHRAE/IESNA/ANSI 90.1-2001 Standard which will soon be printed as part of the 90.1-2004 version. An analysis of the effectiveness of this adoption for New York State can be provided by a direct comparison of these values with existing LPD levels represented in the current IECC 2000 code, which are themselves a subset of the current… more
Date: October 20, 2004
Creator: Richman, Eric E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Spin alignment of vector mesons in non-central A+Acollisions

Description: We discuss the consequence of global polarization of the produced quarks in non-central heavy-ion collisions on the spin alignment of vector mesons. We show that the alignment is quite different for different hadronization scenarios. These results can be tested directly by measuring the vector mesons' alignment through angular distributions of the decay products with respect to the reaction plane. Such angular distributions will give rise to azimuthal anisotropy v{sub 2} of the decay products i… more
Date: October 20, 2004
Creator: Liang, Zuo-Tang & Wang, Xin-Nian
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of Steel Foam Materials and Structures

Description: In the past few years there has been a growing interest in lightweight metal foams. Demands for weight reduction, improved fuel efficiency, and increased passenger safety in automobiles now has manufacturers seriously considering the use of metal foams, in contrast to a few years ago, when the same materials would have been ruled out for technical or economical reasons. The objective of this program was to advance the development and use of steel foam materials, by demonstrating the advantages … more
Date: October 20, 2004
Creator: Kremer, Kenneth; Liszkiewicz, Anthony & Adkins, James
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Theory of Electron Transfer in Complex Systems

Description: This research grant is the most recent of a continuous series of grants from the Department of Energy supporting our theoretical efforts to understand various electron transfer processes. In part, my research on this topic has focused on distributions of electric fields, as it is these fields that drive electron transfer. Additional focus has been concerned with kinetics, as the rates of electron transfer are central to the utility of electron transfer. Finally, we have found that the theoretic… more
Date: October 20, 2004
Creator: Chandler, David
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cost Analysis of Fuel Cell Systems for Transportation Compressed Hydrogen and PEM Fuel Cell System

Description: PEMFC technology for transportation must be competitive with internal combustion engine powertrains in a number of key metrics, including performance, life, reliability, and cost. Demonstration of PEMFC cost competitiveness has its own challenges because the technology has not been applied to high volume automotive markets. The key stack materials including membranes, electrodes, bipolar plates, and gas diffusion layers have not been produced in automotive volumes to the exacting quality requir… more
Date: October 20, 2004
Creator: Carlson, Eric J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen