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465 Matching Results
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Trends in Terrorism: 2006
None
Date:
March 12, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Procedural Analysis of Private Laws Enacted: 1986-2007
None
Date:
March 12, 2008
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Electoral College: Reform Proposals in the 109th Congress
None
Date:
March 12, 2007
Creator:
Neale, Thomas H.
Object Type:
Report
System:
The UNT Digital Library
Minimum Wage in the Territories and Possessions of the United States: Application of the Fair Labor Standards Act
None
Date:
March 12, 2008
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Aviation Finance: Federal Aviation Administration (FAA) Reauthorization and Related Issues
This report provides background information on how the existing trust fund based aviation finance system operates, discusses several basic issues concerning aviation taxation, and identifies FAA programmatic spending.
Date:
March 12, 2007
Creator:
Fischer, John W.
Object Type:
Report
System:
The UNT Digital Library
Welfare Reform: TANF Trends and Data
None
Date:
March 12, 2003
Creator:
Burke, Vee
Object Type:
Report
System:
The UNT Digital Library
Operation of a Four-Cylinder 1.9L Propane Fueled Homogeneous Charge Compression Ignition Engine: Basic Operating Characteristics and Cylinder-to-Cylinder Effects
A four-cylinder 1.9 Volkswagen TDI Engine has been converted to run in Homogeneous Charge Compression Ignition (HCCI) mode. The stock configuration is a turbocharged direct injection Diesel engine. The combustion chamber has been modified by discarding the in-cylinder Diesel fuel injectors and replacing them with blank inserts (which contain pressure transducers). The stock pistons contain a reentrant bowl and have been retained for the tests reported here. The intake and exhaust manifolds have also been retained, but the turbocharger has been removed. A heater has been installed upstream of the intake manifold and fuel is added just downstream of this heater. The performance of this engine in naturally aspirated HCCI operation, subject to variable intake temperature and fuel flow rate, has been studied. The engine has been run with propane fuel at a constant speed of 1800 rpm. This work is intended to characterize the HCCI operation of the engine in this configuration that has been minimally modified from the base Diesel engine. The performance (BMEP, IMEP, efficiency, etc) and emissions (THC, CO, NOx) of the engine are presented, as are combustion process results based on heat release analysis of the pressure traces from each cylinder.
Date:
March 12, 2001
Creator:
Flowers, D.; Aceves, S. M.; Martinez-Frias, J.; Smith, J. R.; Au, M.; Girard, J. et al.
Object Type:
Article
System:
The UNT Digital Library
High Pressure Back up Air Piping Pressure Test
None
Date:
March 12, 2002
Creator:
Rucinski, Russell A.
Object Type:
Report
System:
The UNT Digital Library
[Letter from Al Daniels and Dan Graney to to Russell B. Bridges]
Thank-you letter from Al Daniels and Dan Graney to Russell B. Bridges discussing financial and volunteer contributions.
Date:
March 12, 2009
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Today Cedar Hill (Duncanville, Tex.), Vol. 43, No. 41, Ed. 1 Thursday, March 12, 2009
Weekly newspaper from Duncanville, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Fort Worth, Tex.), Vol. 32, No. 340, Ed. 1 Thursday, March 12, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
March 12, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Dallas, Tex.), Vol. 31, No. 337, Ed. 1 Wednesday, March 12, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
March 12, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Fort Worth, Tex.), Vol. 32, No. 341, Ed. 1 Thursday, March 12, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
March 12, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 65, Ed. 1 Wednesday, March 12, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
March 12, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Arlington-Grand Prairie, Tex.), Vol. 32, No. 339, Ed. 1 Thursday, March 12, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
March 12, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Transcriptional Response of Desulfovibrio vulgaris Hildenborough to Oxidative Stress Mimicking Environmental Conditions
Sulphate-reducing bacteria are anaerobes readily found in oxic-anoxic interfaces. Multiple defence pathways against oxidative conditions were identified in these organisms and proposed to be differentially expressed under different concentrations of oxygen, contributing to their ability to survive oxic conditions. In this study, Desulfovibrio vulgaris Hildenborough cells were exposed to the highest concentration of oxygen that sulphate-reducing bacteria are likely to encounter in natural habitats, and the global transcriptomic response was determined. 307 genes were responsive, with cellular roles in energy metabolism, protein fate, cell envelope and regulatory functions, including multiple genes encoding heat shock proteins, peptidases and proteins with heat shock promoters. Of the oxygen reducing mechanisms of D. vulgaris only the periplasmic hydrogen-dependent mechanism is up-regulated, involving the [NiFeSe]hydrogenase, formate dehydrogenase(s) and the Hmc membrane complex. The oxidative defence response concentrates on damage repair by metal-free enzymes. These data, together with the down regulation of the Fur operon, which restricts the availability of iron, and the lack of response of the PerR operon, suggest that a major effect of this oxygen stress is the inactivation and/or degradation of multiple metalloproteins present in D. vulgaris as a consequence of oxidative damage to their metal clusters.
Date:
March 12, 2008
Creator:
Pereira, Patricia M.; He, Qiang; Xavier, Antonio V.; Zhou, Jizhong; Pereira, Ines A.C. & Louro, Ricardo O.
Object Type:
Article
System:
The UNT Digital Library
NGNP/HTE Full-Power Operation at Reduced High-Temperature Heat Exchanger Temperatures.
Operation of the Next Generation Nuclear Plant (NGNP) with reduced reactor outlet temperature at full power was investigated for the High Temperature Electrolysis (HTE) hydrogen-production application. The foremost challenge for operation at design temperature is achieving an acceptably long service life for heat exchangers. In both the Intermediate Heat Exchanger (IHX) and the Process Heat Exchanger (PHX) (referred to collectively as high temperature heat exchangers) a pressure differential of several MPa exists with temperatures at or above 850 C. Thermal creep of the heat exchanger channel wall may severely limit heat exchanger life depending on the alloy selected. This report investigates plant performance with IHX temperatures reduced by lowering reactor outlet temperature. The objective is to lower the temperature in heat transfer channels to the point where existing materials can meet the 40 year lifetime needed for this component. A conservative estimate for this temperature is believed to be about 700 C. The reactor outlet temperature was reduced from 850 C to 700 C while maintaining reactor power at 600 MWt and high pressure compressor outlet at 7 MPa. We included a previously reported design option for reducing temperature at the PHX. Heat exchanger lengths were adjusted to reflect the …
Date:
March 12, 2009
Creator:
VIlim, R.
Object Type:
Report
System:
The UNT Digital Library
Testing the Floor Scale Designated for Pacific Northwest National Laboratory's UF6 Cylinder Portal Monitor
Pacific Northwest National Laboratory (PNNL) obtained a Mettler Toledo floor scale for the purpose of testing it to determine whether it can replace the International Atomic Energy Agency’s (IAEA) cumbersome, hanging load cell. The floor scale is intended for use as a subsystem within PNNL’s nascent UF6 Cylinder Portal Monitor. The particular model was selected for its accuracy, size, and capacity. The intent will be to use it only for 30B cylinders; consequently, testing did not proceed beyond 8,000 lb.
Date:
March 12, 2009
Creator:
Curtis, Michael M. & Weier, Dennis R.
Object Type:
Report
System:
The UNT Digital Library
Comment on Turbulent Equipartition Theory of Toroidal Momentum Pinch
This response demonstrates that the comment by Peeters et al. contains an incorrect and misleading interpretation of our paper [Hahm et al., Phys. Plasmas 15, 055902 (2008)] regarding the density gradient dependence of momentum pinch and the turbulent equipartition (TEP) theory.
Date:
March 12, 2009
Creator:
T.S. Hahm, P.H. Diamond, O.D. Gurcan, and G. Rewoldt
Object Type:
Report
System:
The UNT Digital Library
Development of an Enhanced GenVARR™ (Generator Volt Ampere Reactive Reserve) System
Transmission system operators require near real time knowledge of reactive power capability to reliably operate large electric power transmission systems. Reactive power produced by, or capable of being produced by, a power generator is often estimated based on a series of mega volt amperes (MVA) capability curves for the generator. These curves indicate the ability of the generator to produce real and reactive power under a variety of conditions. In transmission planning and operating studies, it is often assumed, based on estimates for these capability curves, that the generator can provide its rated MVA capability output when needed for system stability However, generators may not always operate at levels depicted by the maximum MVA capability curve due to present constraints. Transmission system operators utilizing the generators’ capability curves for operation decisions regarding transmission system stability or for planning horizons may overestimate the capability of the generators to supply reactive power when required. Southern Company has enhanced GenVARR(TM), the system of plant data query, retrieval, and analysis and calculates the actual – not estimated -- remaining reactive power output capability. The remaining reactive output is considered spinning reserve and is displayed graphically to transmission control center and generating plant operators to …
Date:
March 12, 2009
Creator:
Schatz, Joe E.
Object Type:
Report
System:
The UNT Digital Library
Material Balance Assessment for Double-Shell Tank Waste Pipeline Transfer
PNNL developed a material balance assessment methodology based on conservation of mass for detecting leaks and mis-routings in pipeline transfer of double-shell tank waste at Hanford. The main factors causing uncertainty in these transfers are variable property and tank conditions of density, existence of crust, and surface disturbance due to mixer pump operation during the waste transfer. The methodology was applied to three waste transfers from Tanks AN-105 and AZ-102.
Date:
March 12, 2001
Creator:
Onishi, Yasuo; Wells, Beric E.; Hartley, Stacey A. & Enderlin, Carl W.
Object Type:
Report
System:
The UNT Digital Library
Validation of the G-PASS code : status report.
Validation is the process of determining whether the models in a computer code can describe the important phenomena in applications of interest. This report describes past work and proposed future work for validating the Gas Plant Analyzer and System Simulator (G-PASS) code. The G-PASS code was developed for simulating gas reactor and chemical plant system behavior during operational transients and upset events. Results are presented comparing code properties, individual component models, and integrated system behavior against results from four other computer codes. Also identified are two experiment facilities nearing completion that will provide additional data for individual component and integrated system model validation. The main goal of the validation exercise is to ready a version of G-PASS for use as a tool in evaluating vendor designs and providing guidance to vendors on design directions in nuclear-hydrogen applications.
Date:
March 12, 2009
Creator:
Vilim, R. B.
Object Type:
Report
System:
The UNT Digital Library
INTEGRATED WATER TREATMENT SYSTEM PERFORMANCE EVALUATION
This document describes the results of an evaluation of the current Integrated Water Treatment System (IWTS) operation against design performance and a determination of short term and long term actions recommended to sustain IWTS performance.
Date:
March 12, 2009
Creator:
Ra, Sexton & We, Meeuwsen
Object Type:
Report
System:
The UNT Digital Library
DOE Joint Genome Institute 2008 Progress Report
While initially a virtual institute, the driving force behind the creation of the DOE Joint Genome Institute in Walnut Creek, California in the Fall of 1999 was the Department of Energy's commitment to sequencing the human genome. With the publication in 2004 of a trio of manuscripts describing the finished 'DOE Human Chromosomes', the Institute successfully completed its human genome mission. In the time between the creation of the Department of Energy Joint Genome Institute (DOE JGI) and completion of the Human Genome Project, sequencing and its role in biology spread to fields extending far beyond what could be imagined when the Human Genome Project first began. Accordingly, the targets of the DOE JGI's sequencing activities changed, moving from a single human genome to the genomes of large numbers of microbes, plants, and other organisms, and the community of users of DOE JGI data similarly expanded and diversified. Transitioning into operating as a user facility, the DOE JGI modeled itself after other DOE user facilities, such as synchrotron light sources and supercomputer facilities, empowering the science of large numbers of investigators working in areas of relevance to energy and the environment. The JGI's approach to being a user facility is …
Date:
March 12, 2009
Creator:
Gilbert, David
Object Type:
Report
System:
The UNT Digital Library