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500 Matching Results
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Analysis of the Effect of Geometry Generated Turbulence on HCCI Combustion by Multi-Zone Modeling
This paper illustrates the applicability of a sequential fluid mechanics, multi-zone chemical kinetics model to analyze HCCI experimental data for two combustion chamber geometries with different levels of turbulence: a low turbulence disc geometry (flat top piston), and a high turbulence square geometry (piston with a square bowl). The model uses a fluid mechanics code to determine temperature histories in the engine as a function of crank angle. These temperature histories are then fed into a chemical kinetic solver, which determines combustion characteristics for a relatively small number of zones (40). The model makes the assumption that there is no direct linking between turbulence and combustion. The results show that the multi-zone model yields good results for both the disc and the square geometries. The model makes good predictions of pressure traces and heat release rates. The experimental results indicate that the high turbulence square geometry has longer burn duration than the low turbulence disc geometry. This difference can be explained by the sequential multi-zone model, which indicates that the cylinder with the square bowl has a thicker boundary layer that results in a broader temperature distribution. This broader temperature distribution tends to lengthen the combustion, as cold mass within …
Date:
December 13, 2004
Creator:
Aceves, S. M.; Flowers, D. L.; Martinez-Frias, J.; Espinosa-Loza, F.; Christensen, M.; Johansson, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Realizing the Opportunities of Neutron Cross Section Measurements at RIA
The Rare Isotope Accelerator will produce many isotopes at never before seen rates. This will allow for the first time measurements on isotopes very far from stability and new measurement opportunities for unstable nuclei near stability. In fact, the production rates are such that it should be possible to collect 10 micrograms of many isotopes with a half-life of 1 day or more. This ability to make targets of short-lived nuclei enables the possibility of making neutron cross-section measurements important to the astrophysics and the stockpile stewardship communities. But to fully realize this opportunity, the appropriate infrastructure must be included at the RIA facility. This includes isotope harvesting capabilities, radiochemical areas for processing collected material, and an intense, ''mono-energetic'', tunable neutron source. As such, we have been developing a design for neutron source facility to be included at the RIA site. This facility would produce neutrons via intense beams of deuterons and protons on a variety of targets. The facility would also include the necessary radiochemical facilities for target processing. These infrastructure needs will be discussed in addition to the methods that would be employed at RIA for measuring these neutron cross-sections.
Date:
October 13, 2004
Creator:
Ahle, L; Hausmann, M; Reifarth, R; Roberts, K; Roeben, M; Rusnak, B et al.
Object Type:
Article
System:
The UNT Digital Library
Search for X-ray induced decay of the 31-yr isomer of 178Hf using synchrotron radiation
Isomeric {sup 178}Hf (t{sub 1/2} = 31 yr, E{sub x} = 2.446 MeV, J{sup {pi}} = 16{sup +}) was bombarded by a white beam of x-rays from the Advanced Photon Source at Argonne National Laboratory. A search was made for x-ray induced decay of the isomer by detecting prompt and delayed {gamma} rays associated with the decay. No induced decay was observed. Upper limits for such a process for x-ray energies between 7-100 keV were set. The limits between 7 and 30 keV are below {approx} 3 x 10{sup -27} cm{sup 2}-keV for induced decay that bypasses the 4-s isomer and {approx} 5 x 10{sup -27} cm{sup 2}-keV for induced decay that is delayed through this isomer, orders of magnitude below values at which induced decay was reported previously. These limits are consistent with what is known about the properties of atomic nuclei.
Date:
September 13, 2004
Creator:
Ahmad, I.; Banar, J. C.; Becker, J. A.; Bredeweg, T. A.; Cooper, J. R.; Gemmell, D. S. et al.
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 20, Ed. 1 Thursday, May 13, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
May 13, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
MUSE-4 experiment measurements and analysis.
This report presents a review of the activities performed by the five teams involved in the MUSE-4 experimental program. More details are provided on the contribution by ANL during the year 9/02 to 9/03. The ANL activity consisted both in direct participation in the experimental measurements and in the physics analysis of the experimental data, mainly for the reactivity level, adjoint flux and fission rate distributions and the analysis of dynamic measurements for reactivity determination techniques in subcritical systems. The results provided to complete the Benchmark organized by the OECD and the CEA on the experiment MUSE-4 are also presented. Deterministic calculations have been performed via the ERANOS code system in connection with JEF2.2, ENDF/B-V and ENDF/B-VI data files.
Date:
January 13, 2004
Creator:
Aliberti, G.; Imel, G. & Palmiotti, G.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Dana Anderson, May 13, 2004
The National Museum of the Pacific War presents an oral interview with Dana Anderson. Anderson was born in Manhattan, Kansas on 30 November 1924 and joined the Navy on 2 December 1942. After completing boot camp at the Great Lakes Naval Training Center, Illinois he was sent to San Diego where he trained on the Diesel engines on LCMs. After the training was complete he was assigned to USS Ashland (LSD-1), which was capable of carrying 18 LCMs. After making practice landings in Hawaii with the 2nd Marine Division, the Ashland participated in the invasion of Tarawa. Anderson’s LCM was left on the beach as it was disabled by Japanese shellfire. He returned to the Ashland and later participated in the invasions of Eniwetok and Kwajalein. Returning to the United States, he was sent to Cleveland, Ohio where he received additional training with Diesel engines. He was then assigned to an ocean-going tug hauling concrete forms to the Philippines. This tug was pulling another ship back to the US when the war ended.
Date:
May 13, 2004
Creator:
Anderson, Dana
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Dana Anderson, May 13, 2004
The National Museum of the Pacific War presents an oral interview with Dana Anderson. Anderson was born in Manhattan, Kansas on 30 November 1924 and joined the Navy on 2 December 1942. After completing boot camp at the Great Lakes Naval Training Center, Illinois he was sent to San Diego where he trained on the Diesel engines on LCMs. After the training was complete he was assigned to USS Ashland (LSD-1), which was capable of carrying 18 LCMs. After making practice landings in Hawaii with the 2nd Marine Division, the Ashland participated in the invasion of Tarawa. Anderson’s LCM was left on the beach as it was disabled by Japanese shellfire. He returned to the Ashland and later participated in the invasions of Eniwetok and Kwajalein. Returning to the United States, he was sent to Cleveland, Ohio where he received additional training with Diesel engines. He was then assigned to an ocean-going tug hauling concrete forms to the Philippines. This tug was pulling another ship back to the US when the war ended.
Date:
May 13, 2004
Creator:
Anderson, Dana
Object Type:
Text
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 105, No. 258, Ed. 1 Tuesday, January 13, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 13, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 285, Ed. 1 Friday, February 13, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 13, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 11, Ed. 1 Tuesday, April 13, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 13, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 37, Ed. 1 Thursday, May 13, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 13, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 63, Ed. 1 Sunday, June 13, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 13, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 89, Ed. 1 Tuesday, July 13, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 13, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 115, Ed. 1 Friday, August 13, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 13, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 141, Ed. 1 Monday, September 13, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 13, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 167, Ed. 1 Wednesday, October 13, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 13, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 212, Ed. 1 Monday, December 13, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 13, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Input to the NSF Study on Computational Requirements in Geosciences
The Computational Physics Group of the Earth Sciences Division focuses much of its effort on improving current understanding of the response of geologic media to strong shock waves, and on the interaction of those waves with underground structures. Two codes have been developed and used to achieve these objectives: LDEC and GEODYN. Both codes are three-dimensional and massively parallel, and they have both been used on LLNLs high performance computing platforms to advance the state of the art in computational geophysics.
Date:
December 13, 2004
Creator:
Antoun, T; Lomov, I & Morris, J
Object Type:
Report
System:
The UNT Digital Library
Automatic registration of serial mammary gland sections
We present two new methods for automatic registration of microscope images of consecutive tissue sections. They represent two possibilities for the first step in the 3-D reconstruction of histological structures from serially sectioned tissue blocks. The goal is to accurately align the sections in order to place every relevant shape contained in each image in front of its corresponding shape in the following section before detecting the structures of interest and rendering them in 3D. This is accomplished by finding the best rigid body transformation (translation and rotation) of the image being registered by maximizing a matching function based on the image content correlation. The first method makes use of the entire image information, whereas the second one uses only the information located at specific sites, as determined by the segmentation of the most relevant tissue structures. To reduce computing time, we use a multiresolution pyramidal approach that reaches the best registration transformation in increasing resolution steps. In each step, a subsampled version of the images is used. Both methods rely on a binary image which is a thresholded version of the Sobel gradients of the image (first method) or a set of boundaries manually or automatically obtained that define …
Date:
April 13, 2004
Creator:
Arganda-Carreras, Ignacio; Fernandez-Gonzalez, Rodrigo & Ortiz-de-Solorzano, Carlos
Object Type:
Article
System:
The UNT Digital Library
Software Quality System for the Integrated Design and Production Reference V1.00
None
Date:
July 13, 2004
Creator:
Barter, R H
Object Type:
Report
System:
The UNT Digital Library
Global analysis of inclusive B decays
In light of the large amount of new experimental data, we revisit the determination of |V{sub cb}| and m{sub b} from inclusive semileptonic and radiative B decays. We study shape variables to order {Lambda}{sub QCD}{sup 3}/m{sub b}{sup 3} and {alpha}{sub s}{sup 2}{beta}{sub 0}, and include the order {alpha}{sub s} {Lambda}{sub QCD}/m{sub b} correction to the hadron mass spectrum in semileptonic decay, which improves the agreement with the data. We focus on the 1S and kinetic mass schemes for the b quark, with and without expanding m{sub b}-m{sub c} in HQET. We perform fits to all available data from BABAR, BELLE, CDF, CLEO, and DELPHI, discuss the theoretical uncertainties, and compare with earlier results. We find |V{sub cb}| = (41.9 {+-} 0.6 {+-} 0.1{sub {tau}{sub B}}) x 10{sup -3} and m{sub b}{sup 1S} = 4.68 {+-} 0.04GeV, including our estimate of the theoretical uncertainty in the fit.
Date:
August 13, 2004
Creator:
Bauer, Christian W.; Ligeti, Zoltan; Luke, Michael; Manohar, Aneesh & Trott, Michael
Object Type:
Article
System:
The UNT Digital Library
National Environmental Education Act of 1990: Overview, Implementation, and Reauthorization Issues
None
Date:
April 13, 2004
Creator:
Bearden, David M.
Object Type:
Report
System:
The UNT Digital Library
Update of ENDL U(n,2n), U(n,gamma), U(n,f) Evaluations
The authors are in the re-evaluating of all the actinide cross section evaluations in LLNL's ENDL database, starting with uranium and focusing on inventory changing reactions. This article describes their first serious pass at updating the uranium cross section data, including estimates of cross section uncertainties. Furthermore, they are developing new tools to automate the re-evaluation and this article contains some preliminary results from these codes, namely the {sup 235}U(n, 2n) and {sup 238}U(n, 2n) evaluations.
Date:
February 13, 2004
Creator:
Beck, B.; Brown, D. A. & McNabb, D. P.
Object Type:
Report
System:
The UNT Digital Library
Including dislocation flux in a continuum crystal plasticity model to produce size scale effects
A novel model has been developed to capture size scale and gradient effects within the context of continuum crystal plasticity by explicitly incorporating details of dislocation transport, coupling dislocation transport to slip, evolving spatial distributions of dislocations consistent with the flux, and capturing the interactions among various dislocation populations. Dislocation flux and density are treated as nodal degrees of freedom in the finite element model, and they are determined as part of the global system of equations. The creation, annihilation and flux of dislocations between elements are related by transport equations. Crystallographic slip is coupled to the dislocation flux and the stress state. The resultant gradients in dislocation density and local lattice rotations are analyzed for geometrically necessary and statistically stored dislocation contents that contribute to strength and hardening. Grain boundaries are treated as surfaces where dislocation flux is restricted depending on the relative orientations of the neighboring grains. Numerical results show different behavior near free surfaces and non-deforming surfaces resulting from differing levels of dislocation transmission. Simulations also show development of dislocation pile-ups at grain boundaries and an increase in flow strength reminiscent of the Hall-Petch model. The dislocation patterns have a characteristic size independent of the numerical discretization.
Date:
February 13, 2004
Creator:
Becker, R.; Arsenlis, A.; Bulatov, V. V. & Parks, D. M.
Object Type:
Article
System:
The UNT Digital Library