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7,177 - 7,200 of
7,200
Pawhuska Journal-Capital (Pawhuska, Okla.), Vol. 90, No. 8, Ed. 1 Wednesday, January 26, 2000
Semiweekly newspaper from Pawhuska, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 26, 2000
Creator:
Gann, Sherry
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Penny Record (Bridge City, Tex.), Vol. 38, No. 35, Ed. 1 Wednesday, January 26, 2000
Weekly newspaper from Bridge City, Texas that includes local, state, and national news along with advertising.
Date:
January 26, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Perry Daily Journal (Perry, Okla.), Vol. 107, No. 18, Ed. 1 Wednesday, January 26, 2000
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 26, 2000
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Plant Vogtle cooling tower studies
Intensive ground-based field studies of plumes from two large, natural-draft cooling towers were conducted in support of the MTI modeling effort. Panchromatic imagery, IR imagery, meteorological data, internal tower temperatures and plant power data were collected during the field studies. These data were used to evaluate plume simulations, plume radioactive transfer calculations and plume volume estimation algorithms used for power estimation. Results from six field studies indicate that a 3-D atmospheric model at sufficient spatial resolution can effectively simulate a cooling tower plume if the plume is of sufficient size and the ambient meteorology is known and steady. Small plumes and gusty wind conditions degrade the agreement between the simulated and observed plumes. Thermal radiance calculations based on the simulated plumes produced maximum IR temperatures (near tower exit) which were in good agreement with measured IR temperatures for the larger plumes. For the smaller plumes, the calculated IR temperature was lower than the measured temperature by several degrees. Variations in maximum IR plume temperature with decreasing power (one reactor was undergoing a shutdown process), were clearly observed in the IR imagery and seen in the simulations. These temperature changes agreed with those calculated from an overall tower energy and momentum …
Date:
January 26, 2000
Creator:
O'Steen, L.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Materials Transport Plan for the Plutonium Immobilization Plant
This Materials Transport Plan defines the methodology for moving process and non-process materials within the Plutonium Immobilization Plant (PIP) operations. The scope of the plan includes the movement of materials between plant operational units (gloveboxes or operational areas/rooms within the plant). The movements of materials within the various plant operational units are described in the System Design Description prepared for the individual units. The plan provides a design concept for transporting each type of material including the containerization used during the movements. Further, the plan identifies the high-level functions and requirements for movements of the materials.
Date:
January 26, 2000
Creator:
Gilkison, J. M.; Dyches, G. M.; Randall, W. J. & Steed, J. H.
Object Type:
Report
System:
The UNT Digital Library
Probabilistic Seismic Hazard Characterization and Design Parameters for the Sites of the Nuclear Power Plants of Ukraine
The U.S. Department of Energy (US DOE), under the auspices of the International Nuclear Safety Program (INSP) is supporting in-depth safety assessments (ISA) of nuclear power plants in Eastern Europe and the former Soviet Union for the purpose of evaluating the safety and upgrades necessary to the stock of nuclear power plants in Ukraine. For this purpose the Hazards Mitigation Center at Lawrence Livermore National Laboratory (LLNL) has been asked to assess the seismic hazard and design parameters at the sites of the nuclear power plants in Ukraine. The probabilistic seismic hazard (PSH) estimates were updated using the latest available data and knowledge from LLNL, the U.S. Geological Survey, and other relevant recent studies from several consulting companies. Special attention was given to account for the local seismicity, the deep focused earthquakes of the Vrancea zone, in Romania, the region around Crimea and for the system of potentially active faults associated with the Pripyat Dniepro Donnetts rift. Aleatory (random) uncertainty was estimated from the available data and the epistemic (knowledge) uncertainty was estimated by considering the existing models in the literature and the interpretations of a small group of experts elicited during a workshop conducted in Kiev, Ukraine, on February …
Date:
January 26, 2000
Creator:
Savy, J.B. & Foxall, W.
Object Type:
Report
System:
The UNT Digital Library
Process maps for plasma spray: Part 1: Plasma-particle interactions
This is the first paper of a two part series based on an integrated study carried out at Sandia National Laboratories and the State University of New York at Stony Brook. The aim of the study is to develop a more fundamental understanding of plasma-particle interactions, droplet-substrate interactions, deposit formation dynamics and microstructural development as well as final deposit properties. The purpose is to create models that can be used to link processing to performance. Process maps have been developed for air plasma spray of molybdenum. Experimental work was done to investigate the importance of such spray parameters as gun current, auxiliary gas flow, and powder carrier gas flow. In-flight particle diameters, temperatures, and velocities were measured in various areas of the spray plume. Samples were produced for analysis of microstructures and properties. An empirical model was developed, relating the input parameters to the in-flight particle characteristics. Multi-dimensional numerical simulations of the plasma gas flow field and in-flight particles under different operating conditions were also performed. In addition to the parameters which were experimentally investigated, the effect of particle injection velocity was also considered. The simulation results were found to be in good general agreement with the experimental data.
Date:
January 26, 2000
Creator:
Gilmore, Delwyn L.; Neiser, Richard A., Jr.; Wan, Yuepeng & Sampath, Sanjay
Object Type:
Article
System:
The UNT Digital Library
Processing and mechanical properties of silicon nitride formed by robocasting aqueous slurries
Robocasting is a new freeform fabrication technique for dense ceramics. It uses robotics to control deposition of ceramic slurries through an orifice. The optimization of concentrated aqueous Si{sub 3}N{sub 4} slurry properties to achieve high green density robocast bodies and subsequent high sintered densities was investigated. The effects of pH, electrolyte, additives and solids loading on the dispersion and rheological properties of Si{sub 3}N{sub 4} slurries were determined. The mechanical behavior of sintered robocast bars was determined and compared to conventionally produced silicon nitride ceramics.
Date:
January 26, 2000
Creator:
He, Guoping; Hirschfeld, Deidre A. & Cesarano, Joseph, III
Object Type:
Article
System:
The UNT Digital Library
The Rambler (Fort Worth, Tex.), Vol. 83, No. 1, Ed. 1 Wednesday, January 26, 2000
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
January 26, 2000
Creator:
Pfaffengut, James
Object Type:
Newspaper
System:
The Portal to Texas History
Reaction engineering of co-condensing (methyl)ethoxysilane mixtures: Kinetic characterization and modeling
Molecular homogeneity frequently plays a decisive role in the effective application of organically modified silicate copolymers. However, methods of directly characterizing copolymerization extent in siloxanes generated from mixed alkoxysilanes are not always available or convenient. The authors present an alternative tool for determining kinetic parameters for models of alkoxysilane hydrolytic copolycondensation. Rather than restricting attention to single step batch reactors, they use a semibatch reactor with varying time of injection of one component. They describe the fitting method and show that all necessary kinetic parameters can be determined from a series of ordinary {sup 29}Si NMR data in a straightforward case study: copolymerization of dimethyldiethoxy silane and trimethylethoxysilane. Under conditions providing no direct {sup 29}Si NMR signature of copolymerization, they find kinetic trends consistent with those previously reported. As further validation, the results of a new series of experiments (varying the ratio of mono-functional to difunctional monomer) are predicted by the semibatch copolymerization model and measured parameters. Based on these results, they are able to calculate the molecular homogeneity in the copolymer products investigated. Even for this relatively simple system, the optimal injection time is a complex function of residence time, but early injection of the faster-condensing monomer gives the …
Date:
January 26, 2000
Creator:
Rankin, Stephen E. & McCormick, Alon V.
Object Type:
Article
System:
The UNT Digital Library
Recent results and perspectives at CDF and D0
Over the course of the past years the experimental measurements performed by the two large collaborations, CDF and D0, at the Fermilab Tevatron Collider have fueled advances in the understanding of physics at the energy frontier. At the present time the accelerator complex and the two detectors are undergoing substantial improvements. In this paper, they provide a discussion of some recent results which in turn provides a framework within which one can look to future prospects.
Date:
January 26, 2000
Creator:
Montgomery, H.E.
Object Type:
Article
System:
The UNT Digital Library
Requirements assessment and operational demands for a resource mapping rover mission to the lunar polar regions
A preliminary set of requirements for a robotic rover mission to the lunar polar region are described and assessed. Tasks to be performed by the rover include core drill sample acquisition, mineral and volatile soil content assay, and significant wide area traversals. Assessment of the postulated requirements is performed using first order estimates of energy, power, and communications throughput issues. Two potential rover system configurations are considered, a smaller rover envisioned as part of a group of multiple rovers, and a larger single rover envisioned along more traditional planetary surface rover concept lines.
Date:
January 26, 2000
Creator:
KLARER,PAUL R.; BINDER,ALAN B. & LENARD,ROGER X.
Object Type:
Article
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 115, Ed. 1 Wednesday, January 26, 2000
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 26, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Seismic instrumentation placement recommendations report
This report documents the basis for the selection of Savannah River Site areas and existing facilities to be instrumented.
Date:
January 26, 2000
Creator:
Kelley, J.P.
Object Type:
Report
System:
The UNT Digital Library
The Seminole Sentinel (Seminole, Tex.), Vol. 93, No. 29, Ed. 1 Wednesday, January 26, 2000
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with advertising.
Date:
January 26, 2000
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Study of the react and wind technique for a Nb{sub 3}Sn common coil dipole
Fermilab, in collaboration with LBNL, is exploring the use of the react and wind technique for a common coil dipole with a Nb{sub 3}Sn Rutherford cable. An R and D program on conductor design and magnet technology was begun aiming at an 11 T, 2 layer, 30 mm aperture design operating at 4.5 K. The goal is to explore the feasibility of the react and wind technique for flat coils with a minimum bending radius of 90 mm. In order to improve the understanding of the I{sub c} degradation caused by bending after reaction this effect will be studied on both strands and cables. In this paper, the authors present two techniques to measure the critical current degradation due to bending, both in wires and cables, using standard test facilities. Together with the description of the program they show the results of the first measurements on strands and the layout of the cables that are being produced.
Date:
January 26, 2000
Creator:
Ambrosio, G.
Object Type:
Article
System:
The UNT Digital Library
Synthesis of logic circuits with evolutionary algorithms
In the last decade there has been interest and research in the area of designing circuits with genetic algorithms, evolutionary algorithms, and genetic programming. However, the ability to design circuits of the size and complexity required by modern engineering design problems, simply by specifying required outputs for given inputs has as yet eluded researchers. This paper describes current research in the area of designing logic circuits using an evolutionary algorithm. The goal of the research is to improve the effectiveness of this method and make it a practical aid for design engineers. A novel method of implementing the algorithm is introduced, and results are presented for various multiprocessing systems. In addition to evolving standard arithmetic circuits, work in the area of evolving circuits that perform digital signal processing tasks is described.
Date:
January 26, 2000
Creator:
JONES,JAKE S. & DAVIDSON,GEORGE S.
Object Type:
Article
System:
The UNT Digital Library
Tests of perturbative QCD and jet physics
The author was selective, and organized this presentation by final state: jets, photons, weak bosons and heavy flavor.
Date:
January 26, 2000
Creator:
Womersley, J.
Object Type:
Article
System:
The UNT Digital Library
Tribological properties of nanocrystalline diamond films
In this paper, the authors present the friction and wear properties of nanocrystalline diamond (NCD) films grown in A-fullerene (C{sub 60}) and Ar-CH{sub 4} microwave plasmas. Specifically, they address the fundamental tribological issues posed by these films during sliding against Si{sub 3}N{sub 4} counterfaces in ambient air and inert gases. Grain sizes of the films grown by the new method are very small (10--30 nm) and are much smoother (20-40 nm, root mean square) than those of films grown by the conventional H{sub 2}-CH{sub 4} microwave-assisted chemical-vapor-deposition (CVD) process. Transmission electron microscopy (TEM) revealed that the grain boundaries of these films are very sharp and free of nondiamond phases. The microcrystalline diamond (MCD) films grown by most conventional methods consist of large grains and a rough surface finish, which can cause severe abrasion during sliding against other materials. The friction coefficients of films grown by the new method (i.e., in Ar-C{sub 60} and Ar-CH{sub 4} plasmas) are comparable to those of natural diamond, and wear damage on counterface materials is minimal. Fundamental tribological studies indicate that these films may undergo phase transformation during long-duration, high-speed and/or high-load sliding tests and that the transformation products trapped at the sliding interfaces can …
Date:
January 26, 2000
Creator:
Erdemir, A.; Fenske, G. R.; Kraus, A. R.; Gruen, D. M.; McCauley, T. & Csencsits, R. T.
Object Type:
Article
System:
The UNT Digital Library
University Press (Beaumont, Tex.), Vol. 76, No. 26, Ed. 1 Wednesday, January 26, 2000
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
January 26, 2000
Creator:
Bordeman, Christina
Object Type:
Newspaper
System:
The Portal to Texas History
Vector boson p{sub T} measurements
The current experimental status of vector boson p{sub T} measurements is reviewed. The recent Monte-Carlo implementations of vector boson p{sub T} distributions are compared to the data and the issues involved in making a meaningful comparison are outlined. The method used by CDF to obtain a W p{sub T} distribution from the measured Z p{sub T} distribution is also described.
Date:
January 26, 2000
Creator:
Lancaster, M. & Waters, D.S.
Object Type:
Article
System:
The UNT Digital Library
Věstník (Temple, Tex.), Vol. 88, No. 4, Ed. 1 Wednesday, January 26, 2000
Weekly Czech and English language newspaper from Temple, Texas published as the official organ of the Slavonic Benevolent Order of the State of Texas that includes news of interest to members along with advertising.
Date:
January 26, 2000
Creator:
Vanicek, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
W and Z properties at the Tevatron
The authors present recent results from CDF and D0 on W and Z production cross sections, the width of the W boson, {tau}-e universality in W decays, trilinear gauge boson couplings, and on the observation of Z {r{underscore}arrow} b{anti b}.
Date:
January 26, 2000
Creator:
Ellison, J.
Object Type:
Article
System:
The UNT Digital Library
The Wylie News (Wylie, Tex.), Vol. 53, No. 35, Ed. 1 Wednesday, January 26, 2000
Weekly newspaper from Wylie, Texas that includes local, state and national news along with advertising.
Date:
January 26, 2000
Creator:
Engbrock, Chad B.
Object Type:
Newspaper
System:
The Portal to Texas History