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1,076 Matching Results
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Correspondence of the Gardner and van Genuchten/Mualem relativepermeability function parameters
The Gardner and van Genuchten models of relativepermeability are widely used in analytical and numerical solutions toflow problems. However, the applicab ility of the Gardner model to realproblems is usually limited, because empirical relative permeability datato calibrate the model are not routinely available. In contrast, vanGenuchten parameters can be estimated using more routinely availablematric potential and saturation data. However, the van Genuchten model isnot amenable to analytical solutions. In this paper, we introducegeneralized conversion formulae that reconcile these two models. Ingeneral, we find that the Gardner parameter alpha G is related to the vanGenuchten parameters alpha vG and n by alpha G=alpha vG ~; 1:3 n. Thisconversion rule will allow direct recasting of Gardner-based analyticalsolutions in the van Genuchten parameter space. The validity of theproposed formulae was tested by comparing the predicted relativepermeability of various porous media with measured values.
Date:
January 3, 2007
Creator:
Ghezzehei, Teamrat A.; Kneafsey, Timothy J. & Su, Grace W.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the w and z cross sections in the electron channel for p anti-p collisions at s**(1/2) = 1.96 TeV and extraction of the w total width from the ratio
This dissertation presents measurements of the inclusive production cross sections for W and Z gauge bosons decaying through the electron channel with p{bar p} collisions at a center-of-mass energy of 1.96 TeV. The ratio of these cross sections is then used to extract the W total width. The Standard Model (SM) of electroweak and strong interactions is a collection of theories which together encompass what is currently known about the elementary particles that make up matter and the forces through which they interact. Experimentalists are constantly searching for violations of the Standard Model by making precision measurements of predicted interactions. The decay of the W boson is one such interaction. The rate of its decay is reflected in its width which is predicted to high precision using Standard Model-based calculations. Therefore, a high precision experimental width measurement would be very sensitive to any such violation. In principle the W and Z boson production cross sections could also be good Standard Model tests. However, a precise knowledge of integrated luminosity is required which is unfortunately difficult to obtain at the Tevatron. In fact, the W and Z cross section results can be used to obtain a more precise luminosity measurement. The …
Date:
January 1, 2005
Creator:
Gardner, John Michael
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The J-TAC (Stephenville, Tex.), Vol. 161, No. 1, Ed. 1 Thursday, January 25, 2001
Weekly student newspaper from Tarleton State University in Stephenville, Texas that includes local, state and campus news along with advertising.
Date:
January 25, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The J-TAC (Stephenville, Tex.), Vol. 169, No. 2, Ed. 1 Thursday, January 27, 2005
Weekly student newspaper from Tarleton State University in Stephenville, Texas that includes local, state and campus news along with advertising.
Date:
January 27, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The J-TAC (Stephenville, Tex.), Vol. 165, No. 2, Ed. 1 Thursday, January 30, 2003
Weekly student newspaper from Tarleton State University in Stephenville, Texas that includes local, state and campus news along with advertising.
Date:
January 30, 2003
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Development of a thermoacoustic natural gas liquefier.
Praxair, in conjunction with the Los Alamos National Laboratory, is developing a new technology, thermoacoustic heat engines and refrigerators, for liquefaction of natural gas. This is the only technology capable of producing refrigeration power at cryogenic temperatures with no moving parts. A prototype, with a projected natural gas liquefaction capacity of 500 gallons/day, has been built and tested. The power source is a natural gas burner. Systems will be developed with liquefaction capacities up to 10,000 to 20,000 gallons per day. The technology, the development project, accomplishments and applications are discussed. In February 2001 Praxair, Inc. purchased the acoustic heat engine and refrigeration development program from Chart Industries. Chart (formerly Cryenco, which Chart purchased in 1997) and Los Alamos had been working on the technology development program since 1994. The purchase included assets and intellectual property rights for thermoacoustically driven orifice pulse tube refrigerators (TADOPTR), a new and revolutionary Thermoacoustic Stirling Heat Engine (TASHE) technology, aspects of Orifice Pulse Tube Refrigeration (OPTR) and linear motor compressors as OPTR drivers. Praxair, in cooperation with Los Alamos National Laboratory (LANL), the licensor of the TADOPTR and TASHE patents, is continuing the development of TASHE-OPTR natural gas powered, natural gas liquefiers. The liquefaction …
Date:
January 1, 2002
Creator:
Wollan, John J.; Swift, Gregory W.; Backhaus, Scott N. & Gardner, David L.
Object Type:
Article
System:
The UNT Digital Library
Discrete Symmetries on the Light Front and a General Relation connecting Nucleon Electric Dipole and Anomalous Magnetic Moments
We consider the electric dipole form factor, F{sub 3}(q{sup 2}), as well as the Dirac and Pauli form factors, F{sub 1}(q{sup 2}) and F{sub 2}(q{sup 2}), of the nucleon in the light-front formalism. We derive an exact formula for F{sub 3}(q{sup 2}) to complement those known for F{sub 1}(q{sup 2}) and F{sub 2}(q{sup 2}). We derive the light-front representation of the discrete symmetry transformations and show that time-reversal- and parity-odd effects are captured by phases in the light-front wave functions. We thus determine that the contributions to F{sub 2}(q{sup 2}) and F{sub 3}(q{sup 2}), Fock-state by Fock-state, are related, independent of the fundamental mechanism through which CP violation is generated. Our relation is not specific to the nucleon, but, rather, is true of spin-1/2 systems in general, be they lepton or baryon. The empirical values of the anomalous magnetic moments, in concert with empirical bounds on the associated electric dipole moments, can better constrain theories of CP violation. In particular, we find that the neutron and proton electric dipole moments echo the isospin structure of the anomalous magnetic moments, {kappa}{sup n} {approx} -{kappa}{sup p}.
Date:
January 11, 2006
Creator:
Brodsky, Stanley J.; Gardner, Susan & Hwang, Dae Sung
Object Type:
Article
System:
The UNT Digital Library
MAGNeT : Monitor for Application-Generated Network Traffic /
Over the laqt decade, network practitioners have focused on monitoring, measuring, and characterizing traffic in the network to gain insight into building critical network components (from the protocol stack to routers and switches to network interface cards). Recent research shows that additional insight can be obtained by monitoring traffic at the application level (Le,, before application-sent traffic is modulated by the protocol stack) rather than in the network (i-e., after it is modulated by the protocol stack). Consequently, this paper describes a Monitor for Application-Generated Network Traffic (MAGNeT) that captures traffic generated by the application rather than traffic in the network. MAGNeT consists of application programs as well as modifications to the standard Linux kernel. Together, these tools provide the capability of monitoring an application's network behavior and protocol state information in production systems. The use of MAGNeT will enable the research community to construct a library of real traces of application-generated traffic from which researchers can more realistically test network protocol designs and theory. MAGNeT can also be used to verify the correct operation of protocol enhancements and to troubleshoot and tune protocol implementations.
Date:
January 1, 2001
Creator:
Feng, W. C. (Wu-Chun); Hay, J. R. (Jeffrey R.) & Gardner, M. K. (Mark K.)
Object Type:
Article
System:
The UNT Digital Library
MAGNET TOOLKIT: DESIGN, IMPLEMENTATION, AND EVALUATION.
The current trend in constructing high-performance computing systems is to connect a large number of machines via a fast interconnect or a large-scale network such as the Internet, This approach relies on the performance of the interconnect (or Internet) to enable Past, large-scale distributed computing. A detailed understanding of the communication traffic is required in order to optimize the operation of entire system. Network researchers traditionally monitor traffic in the network to gain the insight necessary to optimize network operations. Recent work suggests additional insight can be obtained by also monitoring trafflc at the application level. The Monitor for Application-Generated Network Traffic toolkit (MAGNeT) we describe here monitors application trallic patterns In production systems, thus enabling more highly optimized networks and interconnects for the next generation of high performance computing system. Keywords- monitor, measurement, network protocol, traffic characterization, TCP, MAGNet, traces, application-generated traffic, virtual supercomputing, network-aware applications, computational giids, high-perfomiance computing.
Date:
January 1, 2001
Creator:
Hay, J. R. (Jeffrey R.); Feng, W. C. (Wu-Chun) & Gardner, M. K. (Mark K.)
Object Type:
Article
System:
The UNT Digital Library
R_transport_matrices
N/A
Date:
January 1, 2008
Creator:
N., Tsoupas; MacKay, W. W.; Satogata, T.; Glenn, W.; Ahrens, L.; Brown, K. et al.
Object Type:
Report
System:
The UNT Digital Library
R_transport_matrices of the Fast Extraction Beam (FEB) of the AGS, and Beam Parameters at the Starting point of the AtR Line
As part of the task to improve and further automate the 'AtR BPM Application' we provide the theoretically calculated R-transport-matrices for the following beam line sections, which are shown schematically in Figure 1: (a) the Fast Extraction Beam section (FEB) of the AGS synchrotron. The FEB section starts at the middle of the GlO-kicker and ends at the middle of the H1 0{_}septum. (b) the Drift Extraction Channel (DEC) section of the AGS synchrotron. The DEC section starts at the middle of the H10{_}septum, continues along the fringe field region of the H11,H12, and H13 AGS main magnets, and ends at the starting point of the AtR line. The knowledge of these R-transport-matrices are needed in order to calculate the beam parameters at the beginning of the AtR line, which in turn, are required to calculate the magnet settings of the U{_}line, that match the U{_}line into the W{_}line. Also by incorporating these R{_}matrices into the model of the AtR line, the G10 kicker and the H10 septum are included in the AtR model therefore one can investigate any 'jitter' of either the GlO{_}kicker or HlO{_}septum by looking at the trajectory of the beam in the AtR line.
Date:
January 1, 2008
Creator:
Tsoupas, N.; MacKay, W. W.; Satogata, T.; Glenn, W.; Ahrens, L.; Brown, K. et al.
Object Type:
Report
System:
The UNT Digital Library
Sequencing Needs for Viral Diagnostics
We built a system to guide decisions regarding the amount of genomic sequencing required to develop diagnostic DNA signatures, which are short sequences that are sufficient to uniquely identify a viral species. We used our existing DNA diagnostic signature prediction pipeline, which selects regions of a target species genome that are conserved among strains of the target (for reliability, to prevent false negatives) and unique relative to other species (for specificity, to avoid false positives). We performed simulations, based on existing sequence data, to assess the number of genome sequences of a target species and of close phylogenetic relatives (''near neighbors'') that are required to predict diagnostic signature regions that are conserved among strains of the target species and unique relative to other bacterial and viral species. For DNA viruses such as variola (smallpox), three target genomes provide sufficient guidance for selecting species-wide signatures. Three near neighbor genomes are critical for species specificity. In contrast, most RNA viruses require four target genomes and no near neighbor genomes, since lack of conservation among strains is more limiting than uniqueness. SARS and Ebola Zaire are exceptional, as additional target genomes currently do not improve predictions, but near neighbor sequences are urgently needed. …
Date:
January 26, 2004
Creator:
Gardner, S N; Lam, M; Mulakken, N J; Torres, C L; Smith, J R & Slezak, T
Object Type:
Article
System:
The UNT Digital Library
Preparation Effects on the Performance of Silica-Doped Hydrous Titanium Oxide (HTO:Si)-Supported Pt Catalysts for Lean-Burn NOx Reduction by Hydrocarbons
This report describes the development of bulk hydrous titanium oxide (HTO)- and silica-doped hydrous titanium oxide (HTO:Si)-supported Pt catalysts for lean-burn NOx catalyst applications. The effects of various preparation methods, including both anion and cation exchange, and specifically the effect of Na content on the performance of Pt/HTO:Si catalysts, were evaluated. Pt/HTO:Si catalysts with low Na content (< 0.5 wt.%) were found to be very active for NOx reduction in simulated lean-burn exhaust environments utilizing propylene as the major reductant species. The activity and performance of these low Na Pt/HTO:Si catalysts were comparable to supported Pt catalysts prepared using conventional oxide or zeolite supports. In ramp down temperature profile test conditions, Pt/HTO:Si catalysts with Na contents in the range of 3-5 wt.% showed a wide temperature window of appreciable NOx conversion relative to low Na Pt/HTO:Si catalysts. Full reactant species analysis using both ramp up and isothermal test conditions with the high Na Pt/HTO:Si catalysts, as well as diffuse reflectance FTIR studies, showed that this phenomenon was related to transient NOx storage effects associated with NaNO{sub 2}/NaNO{sub 3} formation. These nitrite/nitrate species were found to decompose and release NOx at temperatures above 300 C in the reaction environment (ramp up …
Date:
January 1, 2002
Creator:
GARDNER, TIMOTHY J.; MCLAUGHLIN, LINDA I.; MOWERY, DEBORAH L. & SANDOVAL, RONALD S.
Object Type:
Report
System:
The UNT Digital Library
Image Tool
ImageTool is a software package developed at Bechtel Nevada, Los Alamos Operations. This team has developed a set of analysis tools, in the form of image processing software used to evaluate camera calibration data. Performance measures are used to identify capabilities and limitations of a camera system, while establishing a means for comparing systems. The camera evaluations are designed to provide system performance, camera comparison and system modeling information. This program is used to evaluate digital camera images. ImageTool provides basic image restoration and analysis features along with a special set of camera evaluation tools which are used to standardize camera system characterizations. This process is started with the acquisition of a well-defined set of calibration images. Image processing algorithms provide a consistent means of evaluating the camera calibration data. Performance measures in the areas of sensitivity, noise, and resolution are used as a basis for comparing camera systems and evaluating experimental system performance. Camera systems begin with a charge-coupled device (CCD) camera and optical relay system and may incorporate image intensifiers, electro-static image tubes, or electron bombarded charge-coupled devices (EBCCDs). Electro-optical components provide fast shuttering and/or optical gain to camera systems. Camera types evaluated include gated intensified cameras and …
Date:
January 2001
Creator:
Baker, S. A.; Gardner, S. D.; Rogers, M. L.; Sanders, F. & Tunnell, T. W.
Object Type:
Article
System:
The UNT Digital Library
Distributed Wind Energy in Idaho
This project is a research and development program aimed at furthering distributed wind technology. In particular, this project addresses some of the barriers to distributed wind energy utilization in Idaho.
Date:
January 31, 2009
Creator:
Gardner, John; Johnson, Kathryn; Haynes, Todd & Seifert, Gary
Object Type:
Report
System:
The UNT Digital Library
U.S. Circuit and District Court Nominations by President George W. Bush During the 107th-109th Congresses
None
Date:
January 23, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Monte Carlo Advances for the Eolus Asci Project
The Eolus ASCI project includes parallel, 3-D transport simulation for various nuclear applications. The codes developed within this project provide neutral and charged particle transport, detailed interaction physics, numerous source and tally capabilities, and general geometry packages. One such code is MCNPW which is a general purpose, 3-dimensional, time-dependent, continuous-energy Monte Carlo fully-coupled N-Particle transport code. Significant advances are also being made in the areas of modern software engineering and parallel computing. These advances are described in detail.
Date:
January 1, 2000
Creator:
Hendrick, J. S.; Mckinney, G. W. & Cox, L. J.
Object Type:
Article
System:
The UNT Digital Library
A Novel Microcombustor for Sensor and Thermal Energy Management Applications in Microsystems
The microcombustor described in this report was developed primarily for thermal management in microsystems and as a platform for micro-scale flame ionization detectors (microFID). The microcombustor consists of a thin-film heater/thermal sensor patterned on a thin insulating membrane that is suspended from its edges over a silicon frame. This micromachined design has very low heat capacity and thermal conductivity and is an ideal platform for heating catalytic materials placed on its surface. Catalysts play an important role in this design since they provide a convenient surface-based method for flame ignition and stabilization. The free-standing platform used in the microcombustor mitigates large heat losses arising from large surface-to-volume ratios typical of the microdomain, and, together with the insulating platform, permit combustion on the microscale. Surface oxidation, flame ignition and flame stabilization have been demonstrated with this design for hydrogen and hydrocarbon fuels premixed with air. Unoptimized heat densities of 38 mW/mm{sup 2} have been achieved for the purpose of heating microsystems. Importantly, the microcombustor design expands the limits of flammability (Low as compared with conventional diffusion flames); an unoptimized LoF of 1-32% for natural gas in air was demonstrated with the microcombustor, whereas conventionally 4-16% observed. The LoF for hydrogen, methane, …
Date:
January 1, 2003
Creator:
MANGINELL, RONALD P.; MOORMAN, MATTHEW; COLBURN, CHRIS; ANDERSON, LAWRENCE F.; GARDNER, TIMOTHY J.; MOWERY-EVANS, DEBORAH L. et al.
Object Type:
Report
System:
The UNT Digital Library
Science & Technology Review March/April 2008
This month's issue has the following articles: (1) Science and Security in Sharp Focus--Commentary by William H. Goldstein; (2) Extending the Search for Extrasolar Planets--The Gemini Planet Imager will delve deep into the universe to identify planets that cannot be detected with current instrumentation; (3) Standardizing the Art of Electron-Beam Welding--The Laboratory's EBeam Profiler makes electron-beam welds consistent and improves quality control; (4) Molecular Building Blocks Made of Diamonds--Livermore physicists are exploring the electrical properties of diamondoids, tiny molecules of diamond; and (5) Animation Brings Science to Life--Animation helps scientists and engineers effectively communicate their ideas and research in a visually compelling way.
Date:
January 22, 2008
Creator:
Chinn, D J
Object Type:
Report
System:
The UNT Digital Library
Co-design of software and hardware to implement remote sensing algorithms
Both for offline searches through large data archives and for onboard computation at the sensor head, there is a growing need for ever-more rapid processing of remote sensing data. For many algorithms of use in remote sensing, the bulk of the processing takes place in an 'inner loop' with a large number of simple operations. For these algorithms, dramatic speedups can often be obtained with specialized hardware. The difficulty and expense of digital design continues to limit applicability of this approach, but the development of new design tools is making this approach more feasible, and some notable successes have been reported. On the other hand, it is often the case that processing can also be accelerated by adopting a more sophisticated algorithm design. Unfortunately, a more sophisticated algorithm is much harder to implement in hardware, so these approaches are often at odds with each other. With careful planning, however, it is sometimes possible to combine software and hardware design in such a way that each complements the other, and the final implementation achieves speedup that would not have been possible with a hardware-only or a software-only solution. We will in particular discuss the co-design of software and hardware to achieve …
Date:
January 1, 2001
Creator:
Theiler, J. P. (James P.); Frigo, J. (Janette); Gokhale, M. (Maya) & Szymanski, J. J. (John J.)
Object Type:
Article
System:
The UNT Digital Library
Performance of the RADPHI Detector and Trigger in a High Rate Tagged Photon Beam
We describe the design and operation of a detector system for measuring all-photon decays of mesons photoproduced in a tagged photon beam with energies between 4.3 and 5.4 GeV and a flux of 5×107 tagged photons per second. Photons from meson decays were detected with a lead-glass calorimeter with an energy resolution of 11% at 1 GeV. Various veto and trigger components were also present. Final states with as many as six photons were successfully detected and reconstructed.
Date:
January 1, 2007
Creator:
Jones, R. T.; Bogue, T.; Evans, B. E.; Kornicer, M.; Dzierba, A. R.; Gardner, R. et al.
Object Type:
Article
System:
The UNT Digital Library
China Spallation Neutron Source Design
The China Spallation Neutron Source (CSNS) is an accelerator-based high-power project currently in preparation under the direction of the Chinese Academy of Sciences (CAS). The complex is based on an H- linear accelerator, a rapid cycling proton synchrotron accelerating the beam to 1.6 GeV, a solid tungsten target station, and five initial instruments for spallation neutron applications. The facility will operate at 25 Hz repetition rate with a phase-I beam power of about 120 kW. The major challenge is to build a robust and reliable user's facility with upgrade potential at a fractional of ''world standard'' cost.
Date:
January 29, 2007
Creator:
Wei, J.
Object Type:
Article
System:
The UNT Digital Library
Mechanics of Metals with Phase Changes
New experimental data is presented on some exotic metals that exhibit phase changes at cryogenic temperatures. The types of phase changes that were detected in the specific heat data range from martensitic (diffusion less) transitions to superconducting transitions. In addition, the charge density wave (CDW) state in uranium metal was detected in the specific heat. Specific-heat measurements were made in zero-magnetic field using an apparatus capable of obtaining temperatures as low as 0.4 K. Calibration performed on this apparatus, using a single-crystal copper sample, show its accuracy to be 0.50%, while the resolution was better than 0.1%. Our measurements demonstrate that similar high precision and accurate specific-heat measurements can be obtained on milligram-scale samples. In Chapters 2 and 3, specific-heat measurements are presented for the B2 (CsCl structure) alloy AuZn and for {alpha}-uranium (orthorhombic symmetry). The AuZn alloy exhibits a continuous transition at 64.75 K and an entropy of transition of ({Delta}S{sub tr}) 2.02 J K{sup {minus}1} mol{sup {minus}1}. Calculation of the Debye temperature, by extrapolating of the high temperature phase elastic constants to T = 0 K yields a value of 207 K ({+-}2 K), in favorable agreement with the calorimetric value of 219 K ({+-}0.50 K), despite the …
Date:
January 1, 2001
Creator:
Lashley, J.C.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Optical measurement of photosensitizer concentration using a probe with a small source-detector separation
None
Date:
January 1, 2000
Creator:
Canpolat, M. & Mourant, J. R.
Object Type:
Article
System:
The UNT Digital Library