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411 Matching Results
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HCCl Combustion: Analysis and Experiments
Homogeneous charge compression ignition (HCCI) is a new combustion technology that may develop as an alternative to diesel engines with high efficiency and low NOx and particulate matter emissions. This paper describes the HCCI research activities being currently pursued at Lawrence Livermore National Laboratory and at the University of California Berkeley. Current activities include analysis as well as experimental work. On analysis, we have developed two powerful tools: a single zone model and a multi-zone model. The single zone model has proven very successful in predicting start of combustion and providing reasonable estimates for peak cylinder pressure, indicated efficiency and NOX emissions. This model is being applied to develop detailed engine performance maps and control strategies, and to analyze the problem of engine startability. The multi-zone model is capable of very accurate predictions of the combustion process, including HC and CO emissions. The multi-zone model has applicability to the optimization of combustion chamber geometry and operating conditions to achieve controlled combustion at high efficiency and low emissions. On experimental work, we have done a thorough evaluation of operating conditions in a 4-cylinder Volkswagen TDI engine. The engine has been operated over a wide range of conditions by adjusting the intake …
Date:
May 4, 2001
Creator:
Aceves, S. M.; Flowers, D. L.; Martinez-Frias, J.; Smith, J. R.; Dibble, R.; Au, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Network aware distributed applications
Most distributed applications today manage to utilize only a small percentage of the needed and available network bandwidth. Often application developers are not aware of the potential bandwidth of the network, and therefore do not know what to expect. Even when application developers are aware of the specifications of the machines and network links, they have few resources that can help determine why the expected performance was not achieved. What is needed is a ubiquitous and easy-to-use service that provides reliable, accurate, secure, and timely estimates of dynamic network properties. This service will help advise applications on how to make use of the network's increasing bandwidth and capabilities for traffic shaping and engineering. When fully implemented, this service will make building currently unrealizable levels of network awareness into distributed applications a relatively mundane task. For example, a remote data visualization application could choose between sending a wireframe, a pre-rendered image, or a 3-D representation, based on forecasts of CPU availability and power, compression options, and available bandwidth. The same service will provide on-demand performance information so that applications can compare predicted with actual results, and allow detailed queries about the end-to-end path for application and network tuning and debugging.
Date:
February 4, 2001
Creator:
Agarwal, Deborah; Tierney, Brian L.; Gunter, Dan; Lee, Jason & Johnston, William
Object Type:
Article
System:
The UNT Digital Library
RF Gas Plasma Source Development for Heavy Ion Fusion
Presently the Heavy Ion Fusion Virtual National Laboratory is researching ion sources and injector concepts to understand how to optimize beam brightness over a range of currents (50-2000 mA argon equivalent). One concept initially accelerates millimeter size, milliamp beamlets to 1 MeV before merging them into centimeter size, ampere beams. Computer simulations have shown the final brightness of the merged beams is dominated by the emittance growth of the merging process, as long as the beamlets ion temperature is below a few eV. Thus, a RF multicusp source capable of high current density can produce beams with better brightness compared to ones extracted from a colder source with a large aperture and lower current density. As such, experiments have begun to develop a RF multicusp source capable of delivering one amp of extracted beam current. It is expected that it will require 10 kW of 13 MHz RF power delivered via a quartz shielded, one and half turn, four inch diameter antenna. Important considerations in the development of the source include the dependence of current density and beam ion temperature on consumed RF power and gas pressure. A fast rise time ({approx} 100 ns) for the extracted beam pulse must …
Date:
September 4, 2001
Creator:
Ahle, L.; Hall, R. P.; Molvik, A. W.; Kwan, J. W. & Leung, K. N.
Object Type:
Article
System:
The UNT Digital Library
Integrated fuel processor development.
The Department of Energy's Office of Advanced Automotive Technologies has been supporting the development of fuel-flexible fuel processors at Argonne National Laboratory. These fuel processors will enable fuel cell vehicles to operate on fuels available through the existing infrastructure. The constraints of on-board space and weight require that these fuel processors be designed to be compact and lightweight, while meeting the performance targets for efficiency and gas quality needed for the fuel cell. This paper discusses the performance of a prototype fuel processor that has been designed and fabricated to operate with liquid fuels, such as gasoline, ethanol, methanol, etc. Rated for a capacity of 10 kWe (one-fifth of that needed for a car), the prototype fuel processor integrates the unit operations (vaporization, heat exchange, etc.) and processes (reforming, water-gas shift, preferential oxidation reactions, etc.) necessary to produce the hydrogen-rich gas (reformate) that will fuel the polymer electrolyte fuel cell stacks. The fuel processor work is being complemented by analytical and fundamental research. With the ultimate objective of meeting on-board fuel processor goals, these studies include: modeling fuel cell systems to identify design and operating features; evaluating alternative fuel processing options; and developing appropriate catalysts and materials. Issues and outstanding …
Date:
December 4, 2001
Creator:
Ahmed, S.; Pereira, C.; Lee, S. H. D. & Krumpelt, M.
Object Type:
Article
System:
The UNT Digital Library
What Xe nanocrystals in Al can teach us in materials science.
None
Date:
December 4, 2001
Creator:
Allen, C. W.; Birtcher, R. C.; Dahmen, U.; Furuya, K.; Song, M. & Donnelly, S. E.
Object Type:
Article
System:
The UNT Digital Library
Atmospheric Radiation Measurement Program Facilities Newsletter, August 2001.
Monthly newsletter discussing news and activities related to the Atmospheric Radiation Measurement Program, articles about weather and atmospheric phenomena, and other related topics.
Date:
September 4, 2001
Creator:
Atmospheric Radiation Measurement Program (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Atmospheric Radiation Measurement Program Facilities Newsletter, November 2001.
Monthly newsletter discussing news and activities related to the Atmospheric Radiation Measurement Program, articles about weather and atmospheric phenomena, and other related topics.
Date:
December 4, 2001
Creator:
Atmospheric Radiation Measurement Program (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Fabrication by inclined-substrate deposition of biaxially textured buffer layer for coated conductors.
None
Date:
December 4, 2001
Creator:
Balachandran, U.; Ma, B.; Li, M.; Koritala, R. E.; Fisher, B. L.; Erck, R. A. et al.
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 30, No. 26, Ed. 1 Friday, May 4, 2001
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 4, 2001
Creator:
Baldwin, Alisha
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[Letter to Dr. Jack Davis from the Edward and Betty Marcus Foundation - January 4, 2001]
A letter to Dr. Jack Davis from the Edward and Betty Marcus Foundation, regarding grant money for the North Texas Institute for Educators on the Visual Arts (NTIEVA) Think Tank.
Date:
January 4, 2001
Creator:
Bancroft, M'Lou
Object Type:
Letter
System:
The UNT Digital Library
QCD Spectroscopy at GSI: Exotica and Charmonia
In this talk the author gives a short summary of the basics of conventional and exotic meson spectroscopy, and consider in particular those issues in the charmonium and charmonium hybrid sectors which can be addressed by a future antiproton facility at GSI.
Date:
June 4, 2001
Creator:
Barnes, T.
Object Type:
Article
System:
The UNT Digital Library
Development of a Robust Model-Based Water Level Controller for U-Tube Steam Generator
Poor control of steam generator water level of a nuclear power plant may lead to frequent nuclear reactor shutdowns. These shutdowns are more common at low power where the plant exhibits strong non-minimum phase characteristics and flow measurements at low power are unreliable in many instances. There is need to investigate this problem and systematically design a controller for water level regulation. This work is concerned with the study and the design of a suitable controller for a U-Tube Steam Generator (UTSG) of a Pressurized Water Reactor (PWR) which has time varying dynamics. The controller should be suitable for the water level control of UTSG without manual operation from start-up to full load transient condition. Some preliminary simulation results are presented that demonstrate the effectiveness of the proposed controller. The development of the complete control algorithm includes components such as robust output tracking, and adaptively estimating both the system parameters and state variables simultaneously. At the present time all these components are not completed due to time constraints. A robust tracking component of the controller for water level control is developed and its effectiveness on the parameter variations is demonstrated in this study. The results appear encouraging and they are …
Date:
September 4, 2001
Creator:
Basher, A. M. H.
Object Type:
Report
System:
The UNT Digital Library
Beauty Physics at CDF
The CDF experiment has performed several measurements in the area of beauty and charm physics with the data collected during the Run I of the Tevatron. The experiment is now ready to collect new data at higher luminosity with a substantially improved detector. We discuss these improvements and the future measurements in this area of physics accessible after the first few years of data taking. These include the measurement of the mixing frequency of B{sub s} mesons and that of CP violation effects in the B{sub 0} sector.
Date:
September 4, 2001
Creator:
Bedeschi, Franco
Object Type:
Article
System:
The UNT Digital Library
The Colony Courier-Leader (The Colony, Tex.), Vol. 20, No. 34, Ed. 1 Thursday, October 4, 2001
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
October 4, 2001
Creator:
Beesley, Tom
Object Type:
Newspaper
System:
The Portal to Texas History
A Lower Hybrid Current Drive System for Alcator C-Mod
A Lower Hybrid Current Drive system is being constructed jointly by Plasma Science and Fusion Center (PSFC) and Princeton Plasma Physics Laboratory (PPPL) for installation on the Alcator C-Mod tokamak, with the primary goal of driving plasma current in the outer region of the plasma. The Lower Hybrid (LH) system consists of 3 MW power at 4.6 GHz with a maximum pulse length of 5 seconds. Twelve klystrons will feed an array of 4-vertical and 24-horizontal waveguides mounted in one equatorial port. The coupler will incorporate some compact characteristics of the multijunction power splitting while retaining full control of the toroidal phase. In addition a dynamic phase control system will allow feedback stabilization of MHD modes. The desire to avoid possible waveguide breakdown and the need for compactness have resulted in some innovative technical solution which will be presented.
Date:
May 4, 2001
Creator:
Bernabei, S.; Hosea, J. C.; Loesser, D.; Rushinski, J.; Wilson, J. R.; Bonoli, P. et al.
Object Type:
Report
System:
The UNT Digital Library
United Nations Commission on Human Rights (UNCHR): U.S. Membership
This short report provides an overview of the U.N. Commission on Human Rights (UNCHR and Administration and Congressional responses to recent developments.
Date:
June 4, 2001
Creator:
Bite, Vita
Object Type:
Report
System:
The UNT Digital Library
[Letter from Jeff Bray, September 4, 2001]
Letter from Jeff Bray discussing the prosecution of Norine Butte in the theft of money from an organization.
Date:
September 4, 2001
Creator:
Bray, Jeff
Object Type:
Letter
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 106, No. 24, Ed. 1 Thursday, January 4, 2001
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
January 4, 2001
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 107, No. 12, Ed. 1 Thursday, October 4, 2001
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 4, 2001
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History
Doublets and Other Allied Well Patterns
This report looks at a host of balanced patterns at unity mobility ratio. The geometries and rates ranged broadly. It was found that whenever total production and injection are equal, we can gain considerable insight on the flow equations and the fluid movement. The balanced patterns, where the wells are arrayed around a single injector or a single producer, we found that simple equations can define the nature of steady state flow lines and geometries of the flow paths, and their breakthrough behavior. When the rates are not equal, but still are balanced, the geometries are more complex, but still amenable to analytic solution.
Date:
April 4, 2001
Creator:
Brigham, William E.
Object Type:
Report
System:
The UNT Digital Library
Daily Journal (Perry, Okla.), Vol. 108, No. 3, Ed. 1 Thursday, January 4, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 4, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Daily Journal (Perry, Okla.), Vol. 108, No. 67, Ed. 1 Wednesday, April 4, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 4, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Daily Journal (Perry, Okla.), Vol. 108, No. 89, Ed. 1 Friday, May 4, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 4, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Daily Journal (Perry, Okla.), Vol. 108, No. 109, Ed. 1 Monday, June 4, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 4, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History