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459 Matching Results
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Comparison of Four Parallel Algorithms For Domain Decomposed Implicit Monte Carlo
We consider two existing asynchronous parallel algorithms for Implicit Monte Carlo (IMC) thermal radiation transport on spatially decomposed meshes. The two algorithms are from the production codes KULL from Lawrence Livermore National Laboratory and Milagro from Los Alamos National Laboratory. Both algorithms were considered and analyzed in an implementation of the KULL IMC package in ALEGRA, a Sandia National Laboratory high energy density physics code. Improvements were made to both algorithms. The improved Milagro algorithm performed the best by scaling nearly perfectly out to 244 processors.
Date:
December 21, 2004
Creator:
Brunner, T A; Urbatsch, T J; Evans, T M & Gentile, N A
Object Type:
Article
System:
The UNT Digital Library
Comparison of Four Parallel Algorithms For Domain Decomposed Implicit Monte Carlo
Four different algorithms for domain decomposed Monte Carlo are outlined, and the performance of each is measured. These algorithms are implemented in the KULL IMC package [4] running inside of ALEGRA [1]. This package implements the Implicit Monte Carlo (IMC) scheme for thermal radiation transport of Fleck and Cummings [3].
Date:
December 21, 2004
Creator:
Brunner, T; Urbatsch, T; Evans, T & Gentile, N
Object Type:
Article
System:
The UNT Digital Library
Comparison of LiFePO4 from different sources
The lithium iron phosphate chemistry is plagued by the poor conductivity and slow diffusion in the solid phase. In order to alleviate these problems, various research groups have adopted different strategies including decreasing the particle sizes, increasing the carbon content, and adding dopants. In this study, we obtained LiFePO{sub 4} powders and/or electrodes from six different sources and used a combined model-experimental approach to compare the performance. Samples ranged from 0.4% to 15% ''in-situ'' carbon. In addition, particle sizes varied by as much as an order of magnitude between samples. The study detailed in this manuscript allows us to provide insight into the relative importance of the conductivity of the samples compared to the particle size, the impact of having a distribution in particle sizes, and ideas for making materials in order to maximize the power capability of this chemistry.
Date:
June 21, 2004
Creator:
Striebel, Kathryn; Shim, Joongpyo; Srinivasan, Venkat & Newman, John
Object Type:
Article
System:
The UNT Digital Library
Compensation for Bunch Emittance in a Magnetization and Space Charge Dominated Beam.
In order to obtain sufficient cooling rates for the Relativistic Heavy Ion Collider (RHIC) electron cooling, a bunched beam with high bunch charge, high repetition frequency and high energy is required and it is necessary to use a ''magnetized'' beam, i.e., an electron beam with non-negligible angular momentum. Applying a longitudinal solenoid field on the cathode can generate such a beam, which rotates around its longitudinal axis in a field-free region. This paper suggests how a magnetized beam can be accelerated and transported from a RF photocathode electron gun to the cooling section without significantly increasing its emittance. The evolution of longitudinal slices of the beam under a combination of space charge and magnetization is investigated, using paraxial envelope equations and numerical simulations. We find that we must modify the traditional method of compensating for emittance as used for normal non-magnetized beam with space charge to account for magnetization. The results of computer simulations of successful compensation are presented. Alternately, we show an electron bunch density distribution for which all slices propagate uniformly and which does not require emittance compensation.
Date:
June 21, 2004
Creator:
Chang, X.; Ben-Zvi, Ilan & Kewisch, J.
Object Type:
Article
System:
The UNT Digital Library
Computing Path Tables for Quickest Multipaths In Computer Networks
We consider the transmission of a message from a source node to a terminal node in a network with n nodes and m links where the message is divided into parts and each part is transmitted over a different path in a set of paths from the source node to the terminal node. Here each link is characterized by a bandwidth and delay. The set of paths together with their transmission rates used for the message is referred to as a multipath. We present two algorithms that produce a minimum-end-to-end message delay multipath path table that, for every message length, specifies a multipath that will achieve the minimum end-to-end delay. The algorithms also generate a function that maps the minimum end-to-end message delay to the message length. The time complexities of the algorithms are O(n{sup 2}((n{sup 2}/logn) + m)min(D{sub max}, C{sub max})) and O(nm(C{sub max} + nmin(D{sub max}, C{sub max}))) when the link delays and bandwidths are non-negative integers. Here D{sub max} and C{sub max} are respectively the maximum link delay and maximum link bandwidth and C{sub max} and D{sub max} are greater than zero.
Date:
December 21, 2004
Creator:
Grimmell, W.C.
Object Type:
Report
System:
The UNT Digital Library
Congressional Oversight Manual
Throughout its history, Congress has engaged in oversight of the executive branch — the review, monitoring, and supervision of the implementation of public policy. The first several Congresses inaugurated such important oversight techniques as special investigations, reporting requirements, resolutions of inquiry, and use of the appropriations process to review executive activity. Contemporary developments, moreover, have increased the legislature’s capacity and capabilities to check on and check the Executive. Public laws and congressional rules have measurably enhanced Congress’s implied power under the Constitution to conduct oversight.
Date:
October 21, 2004
Creator:
Fisher, Louis; Kaiser, Frederick M.; Oleszek, Walter J. & Rosenberg, Morton
Object Type:
Report
System:
The UNT Digital Library
Conversion and optimization of the parameters from an extended form of the ion-interaction model for Ca(NO3)2(aq) and NaNO3(aq) to those of the standard Pitzer model, and an assessment of the accuracy of the parameter temperature representations
The electrolytes Ca(NO{sub 3}){sub 2}(aq) and NaNO{sub 3}(aq) are both extremely soluble but differ in several important respects. Ca(NO{sub 3}){sub 2}(aq) has complex behavior at low ionic strengths and forms several thermodynamically stable and metastable solid phases, whereas NaNO{sub 3}(aq) forms only an anhydrous solid phase. The thermodynamic properties of both have previously been modeled using extended Pitzer ion-interaction models that include higher-order virial terms, in addition to those of the standard Pitzer model. The parameters of the original Pitzer model, however, are often needed for thermodynamic modeling calculations. In this paper we convert the parameters of the extended ion-interaction models for Ca(NO{sub 3}){sub 2}(aq) and NaNO{sub 3}(aq) to the standard Pitzer model using an extension of the methodology previously described by Rard and Wijesinghe [J. Chem. Thermodynamics 35 (2003) 439.473]. In this variant, the exponential coefficient {alpha}{sub 1}{sup P} of Pitzer's model is also optimized to yield the most accurate overall representation of the osmotic coefficients {phi} over the ionic strength and temperature ranges of interest. The optimal values of {alpha}{sub 1}{sup P} = 0.87 kg{sup 1/2} {center_dot} mol{sup -1/2} for Ca(NO{sub 3}){sub 2}(aq) and {alpha}{sub 1}{sup P} = 1.43 kg{sup 1/2} {center_dot} mol{sup -1/2} for NaNO{sub 3}(aq) are …
Date:
December 21, 2004
Creator:
Wijesinghe, A M & Rard, J A
Object Type:
Article
System:
The UNT Digital Library
Cooper Review (Cooper, Tex.), Vol. 124, No. 43, Ed. 1 Thursday, October 21, 2004
Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date:
October 21, 2004
Creator:
Pinson, Beth
Object Type:
Newspaper
System:
The Portal to Texas History
COST EFFECTIVE REGULATORY APPROACHES TO ENHANCE DOMESTIC OIL & GAS PRODUCTION AND ENSURE THE PROTECTION OF THE ENVIRONMENT
The Environmental Information Management Suite/Risk Based Data Management System (EIMS/RBDMS) and Cost Effective Regulatory Approach (CERA) programs continue to be successful. All oil and gas state regulatory programs participate in these efforts. Significant accomplishments include: streamline regulatory approaches, enhancing environmental protection, and making oil and gas data available via the Internet. Oil and gas companies worldwide now have access to data on state web sites. This reduces the cost of exploration and enables companies to develop properties in areas that would have been cost prohibited for exploration. Early in project, GWPC and State Oil and Gas agencies developed the EIMS and CERA strategic plan to prioritize long term development and implementation. The planning process identifies electronic commerce and coal bed methane as high priorities. The group has involved strategic partners in industry and government to develop a common data exchange process. Technical assistance to Alaska continues to improve their program management capabilities. New initiatives in Alaska include the development of an electronic permit tracking system. This system allows managers to expedite the permitting process. Nationwide, the RBDMS system is largely completed with 22 states and one Indian Nation now using this nationally accepted data management system. Additional remaining tasks include …
Date:
December 21, 2004
Creator:
Grunewald, Ben; Jehn, Paul; Gillespie, Tom & Binder, Ben
Object Type:
Report
System:
The UNT Digital Library
[Couple dances at Texas Natural and Western Swing Festival]
Photograph of a couple dancing at the Texas Natural and Western Swing Festival in San Marcos. The man (right) and the woman (left) are standing across from each other, reaching opposite arms forward to hold hands. The woman is looking at the camera and smiling.
Date:
2004-05-21/2004-05-22
Creator:
Mallory, Randy
Object Type:
Photograph
System:
The UNT Digital Library
Critical Infrastructure Protection: Establishing Effective Information Sharing with Infrastructure Sectors
Testimony issued by the General Accounting Office with an abstract that begins "Critical infrastructure protection (CIP) activities that are called for in federal policy and law are intended to enhance the security of the cyber and physical public and private infrastructures that are essential to our nation's security, economic security, and public health and safety. As our reliance on these infrastructures increases, so do the potential threats and attacks that could disrupt critical systems and operations. Effective information-sharing partnerships between industry sectors and government can contribute to CIP efforts. Federal policy has encouraged the voluntary creation of Information Sharing and Analysis Centers (ISACs) to facilitate the private sector's participation in CIP by serving as mechanisms for gathering and analyzing information and sharing it among the infrastructure sectors and between the private sector and government. This testimony discusses the management and operational structures used by ISACs, federal efforts to interact with and support the ISACs, and challenges to and successful practices for ISACs' establishment, operation, and partnerships with the federal government."
Date:
April 21, 2004
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
The Cuero Record (Cuero, Tex.), Vol. 110, No. 3, Ed. 1 Wednesday, January 21, 2004
Weekly newspaper from Cuero, Texas that includes local, state, and national news along with advertising.
Date:
January 21, 2004
Creator:
Rea, Glenn
Object Type:
Newspaper
System:
The Portal to Texas History
The Cuero Record (Cuero, Tex.), Vol. 110, No. 16, Ed. 1 Wednesday, April 21, 2004
Weekly newspaper from Cuero, Texas that includes local, state, and national news along with advertising.
Date:
April 21, 2004
Creator:
Rea, Glenn
Object Type:
Newspaper
System:
The Portal to Texas History
The Cuero Record (Cuero, Tex.), Vol. 110, No. 29, Ed. 1 Wednesday, July 21, 2004
Weekly newspaper from Cuero, Texas that includes local, state, and national news along with advertising.
Date:
July 21, 2004
Creator:
Rea, Glenn
Object Type:
Newspaper
System:
The Portal to Texas History
Dairy Policy Issues
A temporary pilot program that allows processors to enter into forward price contracts with individual dairy farmers or their cooperatives for certain uses of milk is scheduled to expire December 31, 2004. A forward price contract allows buyers and sellers of a commodity to negotiate a price for the commodity on a future delivery date and insulates both parties from price volatility. Identical bills (H.R. 3308, S. 2565) pending in Congress would convert the pilot program to a permanent one. The bills are supported by dairy processors, but are opposed by the largest organization of dairy cooperatives, which is concerned that the program might undermine federal minimum pricing requirements
Date:
July 21, 2004
Creator:
Chite, Ralph M.
Object Type:
Report
System:
The UNT Digital Library
Dallas Voice (Dallas, Tex.), Vol. 21, No. 2, Ed. 1 Friday, May 21, 2004
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
May 21, 2004
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
[Damian Green performs at Texas Natural and Western Swing Festival]
Photograph of Damian Green performing at the Texas Natural and Western Swing Festival in San Marcos. Green is standing in a charro outfit, looking to the right of the camera and appears to be speaking into a microphone. He is holding the neck of a fiddle in his left hand and a bow in his right.
Date:
2004-05-21/2004-05-22
Creator:
Mallory, Randy
Object Type:
Photograph
System:
The UNT Digital Library
DART bus customers getting a new ride, smoother trip
News release about DART's new, updated bus fleet. The 80 new buses are designed to be less environmentally harmful and more passenger friendly.
Date:
July 21, 2004
Creator:
Lyons, Morgan
Object Type:
Text
System:
The Portal to Texas History
Design Considerations for Low Field Short Photo-Injected Rf Electron Gun With High Charge Electron Bunch.
The RF field and space charge effect in a low field RF gun is given. The cell lengths are modified to have maximum accelerating efficiency. The modification introduces an extra RF field slice emittance. The phase space evolution of the following emittance compensation system is presented taking into account the chromatic effect. The emittance compensation mechanics for RF field and chromatic effect induced emittance is similar to that of compensating the space charge induced emittance. But the requirements are different to have best compensation for them. The beam waist is far in front of linac entrance to have best compensation for the RF field and chromatic effect induced emittance. For low field RF gun with high charge electron bunch this compensation is more important.
Date:
June 21, 2004
Creator:
Chang, X.; Ben-Zvi, Ilan & Kewisch, J.
Object Type:
Article
System:
The UNT Digital Library
DIAMOND AMPLIFIER FOR PHOTOCATHODES.
We report a new approach to the generation of high-current, high-brightness electron beams. Primary electrons are produced by a photocathode (or other means) and are accelerated to a few thousand electron-volts, then strike a specially prepared diamond window. The large Secondary Electron Yield (SEY) provides a multiplication of the number of electrons by about two orders of magnitude. The secondary electrons drift through the diamond under an electric field and emerge into the accelerating proper of the ''gun'' through a Negative Electron Affinity surface of the diamond. The advantages of the new approach include the following: (1) Reduction of the number of primary electrons by the large SEY, i.e. a very low laser power in a photocathode producing the primaries. (2) Low thermal emittance due to the NEA surface and the rapid thermalization of the electrons. (3) Protection of the cathode from possible contamination from the gun, allowing the use of large quantum efficiency but sensitive cathodes. (4) Protection of the gun from possible contamination by the cathode, allowing the use of superconducting gun cavities. (5) Production of high average currents, up to ampere class. (6) Encapsulated design, making the ''load-lock'' systems unnecessary. This paper presents the criteria that need …
Date:
June 21, 2004
Creator:
Rao, T.; Ben-Zvi, Ilan; Burrill, A.; Chang, X.; Hulbert, S.; Johnson, P. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Diesel hybridization and emissions.
The CTR Vehicle Systems and Fuels team a diesel hybrid powertrain. The goal of this experiment was to investigate and demonstrate the potential of diesel engines for hybrid electric vehicles (HEVs) in a fuel economy and emissions. The test set-up consisted of a diesel engine coupled to an electric motor driving a Continuously Variable Transmission (CVT). This hybrid drive is connected to a dynamometer and a DC electrical power source creating a vehicle context by combining advanced computer models and emulation techniques. The experiment focuses on the impact of the hybrid control strategy on fuel economy and emissions-in particular, nitrogen oxides (NO{sub x}) and particulate matter (PM). The same hardware and test procedure were used throughout the entire experiment to assess the impact of different control approaches.
Date:
April 21, 2004
Creator:
Pasquier, M. & Monnet, G.
Object Type:
Report
System:
The UNT Digital Library
Doctoral Recital: 2004-06-21 – Michael A. Rossi, trumpet
Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
June 21, 2004
Creator:
Rossi, Michael
Object Type:
Sound
System:
The UNT Digital Library
Doctoral Recital: 2004-06-21 – Songyoung Kim, violin
Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
June 21, 2004
Creator:
Kim, Songyoung
Object Type:
Sound
System:
The UNT Digital Library
DOE-EPSCoR Award. Final Report
This research has led to an understanding of the microscopic processes that are responsible for manipulation of atoms on metal surfaces.
Date:
May 21, 2004
Creator:
Rahman, Talat S.
Object Type:
Report
System:
The UNT Digital Library