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John Abercrombie, Jazz Lecture Series, March 5, 2002
Performances recorded the Recital Hall of the UNT Music Building.
Date:
March 5, 2002
Creator:
Abercrombie, John
Object Type:
Video
System:
The UNT Digital Library
Simulated Passage Through A Modified Kaplan Turbine Pressure Regime: A Supplement to "Laboratory Studies of the Effects of Pressure and Dissolved Gas Supersaturation on Turbine-Passed Fish"
Migratory and resident fish in the Columbia River basin are exposed to stresses associated with hydroelectric power production, including pressure changes during turbine passage and dissolved gas supersaturation (resulting from the release of water from the spillway). The responses of fall Chinook salmon and bluegill sunfish to these two stresses, both singly and in combination, were investigated in the laboratory. A previous test series (Abernethy et al. 2001) evaluated the effects of passage through a Kaplan turbine under the ?worst case? pressure conditions. For this series of tests, pressure changes were modified to simulate passage through a Kaplan turbine under a more ?fish-friendly? mode of operation. The results were compared to results from Abernethy et al. (2001). Fish were exposed to total dissolved gas (TDG) levels of 100%, 120%, or 135% of saturation for 16-22 hours at either surface (101 kPa) or 30 ft (191 kPa) of pressure, then held at surface pressure at 100% saturation for a 48-hour observation period. Sensitivity of fall Chinook salmon to gas supersaturation was slightly higher than in the previous test series, with 15% mortality for surface-acclimated fish at 120% TDG, compared to 0% in the previous tests.
Date:
March 15, 2002
Creator:
Abernethy, Cary S.; Amidan, Brett G. & Cada, G. F.
Object Type:
Report
System:
The UNT Digital Library
Generalization of Spatial Channel Theory to Three-Dimensional x-y-z Transport Computations
Spatial channel theory, initially introduced in 1977 by M. L. Williams and colleagues at ORNL, is a powerful tool for shield design optimization. It focuses on so called ''contributon'' flux and current of particles (a fraction of the total of neutrons, photons, etc.) which contribute directly or through their progeny to a pre-specified response, such as a detector reading, dose rate, reaction rate, etc., at certain locations of interest. Particles that do not contribute directly or indirectly to the pre-specified response, such as particles that are absorbed or leak out, are ignored. Contributon fluxes and currents are computed based on combined forward and adjoint transport solutions. The initial concepts were considerably improved by Abu-Shumays, Selva, and Shure by introducing steam functions and response flow functions. Plots of such functions provide both qualitative and quantitative information on dominant particle flow paths and identify locations within a shield configuration that are important in contributing to the response of interest. Previous work was restricted to two dimensional (2-D) x-y rectangular and r-z cylindrical geometries. This paper generalizes previous work to three-dimensional x-y-z geometry, since it is now practical to solve realistic 3-D problems with multidimensional transport programs. As in previous work, new analytic …
Date:
March 12, 2002
Creator:
Abu-Shumays, I. K.; Hunter, M. A.; Martz, R. L. & Risner, J. M.
Object Type:
Article
System:
The UNT Digital Library
Performance Evaluation Tests of Insulated Pressure Vessels for Vehicular Hydrogen Storage
Insulated pressure vessels are cryogenic-capable pressure vessels that can be fueled with liquid hydrogen or ambient-temperature compressed hydrogen. This flexibility results in multiple advantages with respect to compressed hydrogen tanks or low-pressure liquid hydrogen tanks. Our work is directed at verifying that commercially available aluminum-lined, fiber-wrapped pressure vessels can be safely used to store liquid hydrogen. A series of tests have been conducted, and the results indicate that no significant vessel damage has resulted from cryogenic operation. Future activities include a demonstration project in which the insulated pressure vessels will be installed and tested on two vehicles. A draft standard will also be generated for certification of insulated pressure vessels.
Date:
March 1, 2002
Creator:
Aceves, S M; Martinez-Frias, J & Espinoza-Loza, F
Object Type:
Article
System:
The UNT Digital Library
DIGESTER GAS - FUEL CELL - PROJECT
GEW has been operating the first fuel cell in Europe producing heat and electricity from digester gas in an environmentally friendly way. The first 9,000 hours in operation were successfully concluded in August 2001. The fuel cell powered by digester gas was one of the 25 registered ''Worldwide projects'' which NRW presented at the EXPO 2000. In addition to this, it is a key project of the NRW State Initiative on Future Energies. All of the activities planned for the first year of operation were successfully completed: installing and putting the plant into operation, the transition to permanent operation as well as extended monitoring till May 2001.
Date:
March 1, 2002
Creator:
Adolph, Dr.-Eng. Dirk & Saure, Dipl.-Eng. Thomas
Object Type:
Report
System:
The UNT Digital Library
QED Radiative Corrections in Processes of Exclusive Pion Electroproduction
Formalism for radiative correction (RC) calculation in exclusive pion electroproduction on the proton is presented. A FORTRAN code EXCLURAD is developed for the RC procedure. The numerical analysis is done in the kinematics of current Jefferson Lab experiments.
Date:
March 1, 2002
Creator:
Afanasev, Andrei; Akushevich, I.; Burkert, Volker & Joo, K.
Object Type:
Article
System:
The UNT Digital Library
Trade and the Americas
None
Date:
March 5, 2002
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Trade Policymaking in the European Union: Institutional Framework
None
Date:
March 27, 2002
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
U.S.-European Union Trade Relations: Issues and Policy Challenges
None
Date:
March 4, 2002
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
U.S.-European Union Trade Relations: Issues and Policy Challenges
None
Date:
March 27, 2002
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Testing and modeling of seepage into underground openings in aheterogeneous fracture system at Yucca Mountain, Nevada
We discuss field activities designed to characterize seepage into an underground opening at the potential site for geologic storage of high-level radioactive waste (HLRW) at Yucca Mountain, Nevada, and the use of these data for development and calibration of a model for predicting seepage into planned HLRW emplacement drifts. Air-injection tests were conducted to characterize the permeability of the fractured rock, and liquid-release tests (LRTs) were conducted and seepage monitored to characterize the seepage-relevant properties of the fractured rock. Both air-injection and liquid-release tests were performed in the same borehole intervals, located above the underground openings. For modeling, three-dimensional, heterogeneous permeability fields were generated, conditioned on the air-permeability data. The initial seepage data collected were used to calibrate the model and test the appropriateness of the modeling approach. A capillary-strength parameter and porosity were the model parameters selected for estimation by data inversion. However, due to the short-term nature of the initial data, the inversion process was unable to independently determine the capillary strength and porosity of the fractured rock. Subsequent seepage data collection focused on longer-term tests, a representative selection of which was used for data inversion. Field observations also played a key role by identifying factors such as …
Date:
March 25, 2002
Creator:
Ahlers, C. F.; Trautz, R. C.; Cook, P. J. & Finsterle, S.
Object Type:
Article
System:
The UNT Digital Library
Non-Adiabatic Effects on Combustion Front Propagation in Porous Media: Multiplicity of Steady States
The sustained propagation of combustion fronts in porous media is a necessary condition for the success of an in situ combustion project for oil recovery. Compared to other recovery methods, in situ combustion involves the added complexity of exothermic reactions and temperature-dependent chemical kinetics. In the presence of heat losses, the possibility of ignition and extinction (quenching) exists. In this report, we address the properties of combustion fronts propagating at a constant velocity in the presence of heat losses.
Date:
March 11, 2002
Creator:
Akkutlu, I. Yucel & Yortsos, Yanis C.
Object Type:
Report
System:
The UNT Digital Library
ADVANCED TURBINE SYSTEMS PROGRAM
The market for power generation equipment is undergoing a tremendous transformation. The traditional electric utility industry is restructuring, promising new opportunities and challenges for all facilities to meet their demands for electric and thermal energy. Now more than ever, facilities have a host of options to choose from, including new distributed generation (DG) technologies that are entering the market as well as existing DG options that are improving in cost and performance. The market is beginning to recognize that some of these users have needs beyond traditional grid-based power. Together, these changes are motivating commercial and industrial facilities to re-evaluate their current mix of energy services. One of the emerging generating options is a new breed of advanced fuel cells. While there are a variety of fuel cell technologies being developed, the solid oxide fuel cells (SOFC) and molten carbonate fuel cells (MCFC) are especially promising, with their electric efficiency expected around 50-60 percent and their ability to generate either hot water or high quality steam. In addition, they both have the attractive characteristics of all fuel cells--relatively small siting footprint, rapid response to changing loads, very low emissions, quiet operation, and an inherently modular design lending itself to capacity …
Date:
March 1, 2002
Creator:
Ali, Sy
Object Type:
Report
System:
The UNT Digital Library
Highways of a Global Traveler: Tracking Tropospheric Ozone
On the stage of global change, ozone plays the role of both hero and villain. This brief document discusses about the tracking of Tropospheric Ozone, where ozone forms and where it travels have become key concerns for international health and economic policy-making.
Date:
March 22, 2002
Creator:
Allen, Jeannie & Simmon, Robert
Object Type:
Text
System:
The UNT Digital Library
Members of the U.S. Congress Who Have Died of Other Than Natural Causes While in Office
None
Date:
March 13, 2002
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Southwest Retort, Volume 54, Number 7, March 2002
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
March 2002
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Newsletter of the Texas Chapter of the American Fisheries Society, Volume 27, Number 4, Winter 2002
Newsletter of the Texas Chapter of the American Fisheries Society containing information about the organization, membership, and field of aquaculture and ecosystem management.
Date:
March 2002
Creator:
American Fisheries Society. Texas Chapter.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Agent-based Distance Vector Routing: A Resource Efficient and Scalable approach to Routing in Large Communication Networks
Article discussing a resource efficient and scalable approach to routing in large communication networks.
Date:
March 25, 2002
Creator:
Amin, Kaizar A. & Mikler, Armin R.
Object Type:
Article
System:
The UNT Digital Library
LOW TEMPERATURE CATHODE SUPPORTED ELECTROLYTES
This project has three main goals: Thin Films Studies, Preparation of Graded Porous Substrates and Basic Electrical Characterization and testing of Planar Single Cells. This period has continued to address the problem of making dense 1/2 to 5 {micro}m thick dense layers on porous substrates (the cathode LSM). Our current status is that we are making structures of 2-5 cm{sup 2} in area, which consist of either dense YSZ or CGO infiltrated into a 2-5 {micro}m thick 50% porous layer made of either nanoncrystalline CGO or YSZ powder. This composite structure coats a macroporous cathode or anode; which serves as the structural element of the bi-layer structure. These structures are being tested as SOFC elements. A number of structures have been evaluated both as symmetrical and as button cell configuration. Results of this testing indicates that the cathodes contribute the most to cell losses for temperatures below 750 C. In this investigation different cathode materials were studied using impedance spectroscopy of symmetric cells and IV characteristics of anode supported fuel cells. Cathode materials studied included La{sub 0.8}Sr{sub 0.2}Co{sub 0.2}Fe{sub 0.8}O{sub 3} (LSCF), La{sub 0.7}Sr{sub 0.2}MnO{sub 3} (LSM), Pr{sub 0.8}Sr{sub 0.2}Fe{sub 0.8}O{sub 3} (PSCF), Sm{sub 0.8}Sr{sub 0.2}Co{sub 0.2}Fe{sub 0.8}O{sub 3} (SSCF), …
Date:
March 31, 2002
Creator:
Anderson, Harlan U.; Dogan, Fatih & Petrovsky, Vladimir
Object Type:
Report
System:
The UNT Digital Library
Frictional behavior of diamondlike carbon films in vacuum and under varying water vapor pressure.
In this study, we investigated the frictional behavior of both hydrogenated and hydrogen-free diamondlike carbon (DLC) films in high vacuum (10{sup -6} Pa) at room temperature. Water was also introduced into the vacuum chamber to elucidate its effects on DLC film tribology. The hydrogen-free DLC (also referred to as tetrahedral amorphous carbon, or ta-C) was produced by an arc-PVD process, and the highly hydrogenated DLC was produced by plasma-enhanced chemical-vapor deposition. Tribological measurements of these films were made with a pin-on-disc machine with coated steel balls and coated steel discs in matched pairs under a 1 N load. The ball/disk pairs were rotated at sliding speeds in the range of 0.025-0.075 m/s. In vacuum, the steady-state friction coefficient of ta-C was of the order of 0.6 and the wear was severe, whereas for the highly hydrogenated film, friction was below 0.01, and in an optical microscope no wear could be detected. Adding water vapor to the sliding ta-C system in a vacuum chamber caused friction to decrease monotonically from 0.6 to {approx}0.05. In contrast, adding water vapor to the sliding DLC system caused the friction to increase linearly with pressure from 0.01 to 0.07. The results illustrate the importance of …
Date:
March 25, 2002
Creator:
Andersson, J.; Erck, R. A. & Erdemir, A.
Object Type:
Article
System:
The UNT Digital Library
Early universe cosmology and tests of fundamental physics
This is the report of the Working Group on Early Universe Cosmology and tests of Fundamental Physics, group P4.8 of the of the Snowmass 2001 conference. Here we summarize the impressive array of advances that have taken place in this field, and identify opportunities for even greater progress in the future. Topics include Dark Energy, Cosmic Acceleration, Inflation, Phase Transitions, Baryogenesis, and String/M-theory Cosmology. The introductory section gives an executive summary with six key open questions on which we can expect to make significant progress.
Date:
March 4, 2002
Creator:
Andreas Albrecht, Joshua A. Frieman and Mark Trodden
Object Type:
Article
System:
The UNT Digital Library
Broadband Internet Access: Background and Issues
This report is about the Broadband Internet Access, The Background and analysis of Broadband. It's importance, and about broadband technologies like Cable, Satellite and other technologies. The status of Broadband Deployment and Development Issues.
Date:
March 4, 2002
Creator:
Angele. A
Object Type:
Report
System:
The UNT Digital Library
ASIC Wafer Test System for the ATLAS Semiconductor Tracker Front-End Chip
An ASIC wafer test system has been developed to provide comprehensive production screening of the ATLAS Semiconductor Tracker front-end chip (ABCD3T). The ABCD3T[1] features a 128-channel analog front-end, a digital pipeline, and communication circuitry, clocked at 40 MHz, which is the bunch crossing frequency at the LHC (Large Hadron Collider). The tester measures values and tolerance ranges of all critical IC parameters, including DC parameters, electronic noise, time resolution, clock levels and clock timing. The tester is controlled by an FPGA (ORCA3T) programmed to issue the input commands to the IC and to interpret the output data. This allows the high-speed wafer-level IC testing necessary to meet the production schedule. To characterize signal amplitudes and phase margins, the tester utilizes pin-driver, delay, and DAC chips, which control the amplitudes and delays of signals sent to the IC under test. Output signals from the IC under test go through window comparator chips to measure their levels. A probe card has been designed specifically to reduce pick-up noise that can affect the measurements. The system can operate at frequencies up to 100 MHz to study the speed limits of the digital circuitry before and after radiation damage. Testing requirements and design solutions …
Date:
March 19, 2002
Creator:
Anghinolfi, F.; Bialas, W.; Busek, N.; Ciocio, A.; Cosgrove, D.; Fadeyev, V. et al.
Object Type:
Article
System:
The UNT Digital Library
A Study of Past, Present, and Future Radiation Dose Pathways from Hanford Site Effluents
The purpose of this study is to determine whether changes to Hanford operations, as well as changes in the regulatory environment, will require new approaches to ensure radiation protection of the public and the environment. This document discusses the applicable regulations that govern public radiation protection at DOE facilities, recent radiological assessments for members of the public near the Hanford Site, and possible new approaches that may be needed to assure that the Hanford Site can demonstrate compliance with regulatory requirements for radiological protection of the public.
Date:
March 19, 2002
Creator:
Antonio, Ernest J.; Rhoads, Kathleen & Staven, Lissa H.
Object Type:
Report
System:
The UNT Digital Library