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Monte Carlo Simulations of Phosphate Polyhedron Connectivity in Glasses
Monte Carlo simulations of phosphate tetrahedron connectivity distributions in alkali and alkaline earth phosphate glasses are reported. By utilizing a discrete bond model, the distribution of next-nearest neighbor connectivities between phosphate polyhedron for random, alternating and clustering bonding scenarios was evaluated as a function of the relative bond energy difference. The simulated distributions are compared to experimentally observed connectivities reported for solid-state two-dimensional exchange and double-quantum NMR experiments of phosphate glasses. These Monte Carlo simulations demonstrate that the polyhedron connectivity is best described by a random distribution in lithium phosphate and calcium phosphate glasses.
Date:
December 21, 1999
Creator:
ALAM,TODD M.
Object Type:
Article
System:
The UNT Digital Library
Roles and Delegation of Authority (R/DA) System
The processes of defining managerial roles and providing for delegation of authority are essential to any enterprise. At most large organizations, these processes are defined in policy manuals and through sets of standard operating procedures for many, if not all, business and administrative functions. Many of these staff-initiated, administrative functions require the routing of documents for approval to one or more levels of management. These employee-oriented, back office types of workflows tend to require more flexibility in determining to whom these documents should go to, while, at the same time, providing the responsible parties with the flexibility to delegate their approval authority or allow others to review their work. Although this practice is commonplace in manual, paper-based processes that exist in many organizations, it is difficult to provide the same flexibility in the more structured, electronic-based, workflow systems.
Date:
October 21, 1999
Creator:
Abbott, John P.; Hutchins, James C. & Schoch, David G.
Object Type:
Article
System:
The UNT Digital Library
Diamond Anvils With Integrated Diamond-Encapsulated Microprobes for High-Pressure Electrical Transport Experiments
We have fabricated diamond anvils specially designed for use in ultra-high pressure electrical transport experiments. These anvils, which we refer to as ''designer anvils'', feature thin-film metal microprobes which are encased in a layer of high-quality, epitaxial, chemically vapor deposited (CVD) diamond. The synthetic diamond film ensures that the microprobes are survivable to Mbar pressures, and also serves to electrically insulate the microprobes from the high-pressure gasket. High-pressure resistivity experiments were performed on KI and FeO to pressures of approximately 1.8 and 1.7 Mbars, respectively. Future possible applications of designer anvils are also discussed. [electrical conductivity, synthetic diamond, band overlap, metallization, designer anvils]
Date:
July 21, 1999
Creator:
Akella, J.; Catledge, S. A.; Vohra, Y. K. & Weir, S. T.
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with James Driver, March 21, 1999
Access:
Use of this item is restricted to the UNT Community
Interview with Navy veteran James Driver. The interview includes Driver's personal experiences about being a dive-bomber and fighter pilot during the Pacific Theater during World War II, various phases of training, dive-bomber training, having convoy escort duty off New Hebrides, the neutralization of Rabaul, transferring to fighter planes, flying combat air patrol off the carrier USS Hancock, providing cover for the Marine landings on Okinawa, combat against kamikazes, engagements against enemy fighters and kamikazes on the last day of the war, locating and dropping supplies to prisoner-of-war camps in Japan, and returning to the States. The interview includes an appendix with a letter written by Driver.
Date:
March 21, 1999
Creator:
Alexander, William J. & Driver, James
Object Type:
Book
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 88, Ed. 1 Thursday, January 21, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
January 21, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 145, Ed. 1 Wednesday, April 21, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 21, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
High-Resolution Transmission Electron Microscopy Calibration of Critical Dimension (CD) Reference Materials
NIST and Sandia have developed a procedure for producing and calibrating critical dimension (CD), or linewidth, reference materials. These reference materials will be used to calibrate metrology instruments used in semiconductor manufacturing. The artifacts, with widths down to 100 nm, are produced in monocrystalline silicon with all feature edges aligned to specific crystal planes. A two-part calibration of these linewidths is used: the primary calibration, with accuracy to within a few lattice plane thicknesses, is accomplished by counting the lattice planes across the sample as-imaged through use of high-resolution transmission electron microscopy (HRTEM). The secondary calibration is the high-precision electrical CD technique. NIST and Sandia are developing critical dimension (CD), or linewidth, reference materials for use by the semiconductor industry. To meet the current requirements of this rapidly changing industry, the widths of the reference features must be at or below the widths of the finest features in production and/or development. Further, these features must produce consistent results no matter which metrology tool (e.g., scanning electron microscope, scanned probe microscope, electrical metrology) is used to make the measurement. This leads to a requirement for the samples to have planar surfaces, known sidewall angles, and uniform material composition. None of the …
Date:
September 21, 1999
Creator:
Allen, Richard A.; Cresswell, Michael W.; Everist, Sarah C.; Ghoshtagore, Rathindra N.; Headley, Thomas J. & Linholm, Loren W.
Object Type:
Article
System:
The UNT Digital Library
Hydrocarbon rate coefficients for proton and electron impact ionization, dissociation, and recombination in a hydrogen plasma.
We estimate cross sections and rate coefficients for proton and electron impact ionization, dissociation, and recombination of neutral and ionized hydrocarbon molecules and fragments of the form C{sub x}H{sub y}{sup k}, x = 1-3, y = 1-6, k = 0,1 in a thermalized hydrogen-electron plasma.
Date:
July 21, 1999
Creator:
Alman, D. A.; Brooks, J. N.; Ruzic, D. N. & Wang, Z.
Object Type:
Report
System:
The UNT Digital Library
The mean evolution and variability of the Asian summer monsoon: comparison of ECMWF and NCEP/NCAR reanalyses
The behavior of the Asian Summer Monsoon is compared using the European Centre for Medium Range Weather Forecasts Reanalysis (ERA) and the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis (Kalnay et al. 1996). The goals of this paper are to identify common features between the reanalyses, to assess their robustness for model validation, and especially to use reanalyses to develop their understanding of the mean evolution of the Asian Summer Monsoon and the characteristics of its interannual and intraseasonal variability (Annamalai et al. 1999).
Date:
April 21, 1999
Creator:
Annamalai, H.; Hodges, K.; Slingo, J. M. & Sperber, K. R.
Object Type:
Article
System:
The UNT Digital Library
The relationship between intraseasonal and interannual variability during the asian summer monsoon
The purpose of this paper is to investigate intraseasonal (30-70 days) and higher frequency (5-30 days) variability and its relationship to interannual variability. Various modelling studies have suggested a link between intraseasonal and interannual variability of the Asian summer monsoon. This relationship has been mainly based upon the similar spatial structures of the dominant EOF patterns of the monsoon circulation on intraseasonal and interannual time scales from simulations with simple models and atmospheric general circulation models. Here we investigate these relationships using 40 years of NCEP/NCAR Reanalysis. Motivation for this study is embodied in the suggestions of Charney and Shukla (1981) that boundary forcing (e.g., sea surface temperature) may predispose the monsoon system towards a dry or wet state, and the result of Palmer (1994), using the Lorenz (1963) model, that the probability of being in one regime of phase space or another is no longer equally probable in the presence of external forcing. To investigate the influence of the boundary forcing, the probability distribution functions (PDF�s) of the principal components are given.
Date:
April 21, 1999
Creator:
Annamalai, H; Slingo, J M & Sperber, K R
Object Type:
Article
System:
The UNT Digital Library
Logarithmic unification from symmetries enhanced in the sub-millimeter infrared
In theories with TeV string scale and sub-millimeter extra dimensions the attractive picture of logarithmic gauge coupling unification at 10{sup 16} GeV is seemingly destroyed. In this paper we argue to the contrary that logarithmic unification can occur in such theories. The rationale for unification is no longer that a gauge symmetry is restored at short distances, but rather that a geometric symmetry is restored at large distances in the bulk away from our 3-brane. The apparent ''running'' of the gauge couplings to energies far above the string scale actually arises from the logarithmic variation of classical fields in (sets of) two large transverse dimensions. We present a number of N = 2 and N = 1 supersymmetric D-brane constructions illustrating this picture for unification.
Date:
August 21, 1999
Creator:
Arkani-Hamed, Nima; Dimopoulos, Savas & March-Russell, John
Object Type:
Article
System:
The UNT Digital Library
Architecture for nuclear energy in the 21st century
Global and regional scenarios for future energy demand have been assessed from the perspectives of nuclear materials management. From these the authors propose creation of a nuclear fuel cycle architecture which maximizes inherent protection of plutonium and other nuclear materials. The concept also provides technical and institutional flexibility for transition into other fuel cycle systems, particularly those involving breeder reactors. The system, its implementation timeline, and overall impact are described in the paper.
Date:
February 21, 1999
Creator:
Arthu, E.D.; Cunningham, P.T. & Wagner, R.L. Jr.
Object Type:
Article
System:
The UNT Digital Library
Thin Foil Acceleration Method for Measuring the Unloading Isentropes of Shock-Compressed Matter
This work has been performed as part of the search for possible ways to utilize the capabilities of laser and particle beams techniques in shock wave and equation of state physics. The peculiarity of these techniques is that we have to deal with micron-thick targets and not well reproducible incident shock wave parameters, so all measurements should be of a high resolution and be done in one shot. Besides the Hugoniots, the experimental basis for creating the equations of state includes isentropes corresponding to unloading of shock-compressed matter. Experimental isentrope data are most important in the region of vaporization. With guns or explosive facilities, the unloading isentrope is recovered from a series of experiments where the shock wave parameters in plates of standard low-impedance materials placed behind the sample are measured [1,2]. The specific internal energy and specific volume are calculated from the measured p(u) release curve which corresponds to the Riemann integral. This way is not quite suitable for experiments with beam techniques where the incident shock waves are not well reproducible. The thick foil method [3] provides a few experimental points on the isentrope in one shot. When a higher shock impedance foil is placed on the surface …
Date:
July 21, 1999
Creator:
Asay, J. R.; Chhabildas, L. C.; Fortov, V. E.; Kanel, G. I.; Khishchenko, K. V.; Lomonosov, I. V. et al.
Object Type:
Article
System:
The UNT Digital Library
Demonstration Integrated Knowledge-Based System for Estimating Human Error Probabilities
Human Reliability Analysis (HRA) is currently comprised of at least 40 different methods that are used to analyze, predict, and evaluate human performance in probabilistic terms. Systematic HRAs allow analysts to examine human-machine relationships, identify error-likely situations, and provide estimates of relative frequencies for human errors on critical tasks, highlighting the most beneficial areas for system improvements. Unfortunately, each of HRA's methods has a different philosophical approach, thereby producing estimates of human error probabilities (HEPs) that area better or worse match to the error likely situation of interest. Poor selection of methodology, or the improper application of techniques can produce invalid HEP estimates, where that erroneous estimation of potential human failure could have potentially severe consequences in terms of the estimated occurrence of injury, death, and/or property damage.
Date:
April 21, 1999
Creator:
Auflick, Jack L.
Object Type:
Article
System:
The UNT Digital Library
Results of W-87/Mk21 Deployment Separation Shock Tests
This report summarizes results of the W-87/Mk21 Deployment Separation Shock Tests conducted at the Survivability and Vulnerability Integration Center (SVIC) Hill Air Force Base in Ogden, Utah, from 10/5/98 to 10/8/98. Specific details regarding the test plan and procedures can be found in the Master Test Plan listed in the references. Test Objectives: (1) Evaluate the performance of a set of servo accelerometers during and post Re-entry Vehicle (RV) separation events. These ultra-sensitive accelerometers ({mu}g) needed operate during and after the separation shock events and these tests would serve as confirmation of proper functioning. These sensors were later flown on FrU-15, a development flight unit supporting the Instrumented High Fidelity Joint Test Assembly Program, as part of an experimental Inertial Measurement Unit (IMU) measure RV dynamics during RV mechanical separation and spin-up. (2) Measure separation shock response at the IMU accelerometer locations. (3) Measure separation shock response at locations on the warhead and RV common to locations used on MMIII separation tests conducted at LMMS Valley Forge for data comparison.
Date:
April 21, 1999
Creator:
Avalle, C. A.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Technical and Legal Evaluation of Disposing of Nonhazardous Oil Field Waste into Salt Caverns
This report presents an initial evaluation of the suitability, feasibility, and legality of using salt caverns for disposal of nonhazardous oil field wastes. Given the preliminary and general nature of this report, we recognize that some of our findings and conclusions maybe speculative and subject to change upon further research on this topic.
Date:
January 21, 1999
Creator:
Ayers, Robert C.; Caudle, Dan; Elcock, Deborah; Raivel, Mary; Veil, John & Grunewald, Ben
Object Type:
Report
System:
The UNT Digital Library
EXPECTED TRIGGER RATES OF HIGH PT JETS AND DIRECT PHOTONS IN THE STAR EMC.
The STAR experiment at RHIC is a large acceptance detector. The electromagnetic calorimeter (EMC) will provide a sensitive trigger to study high p{sub t} jets and hard photons in AuAu, pp, and pAu collisions. The capability for the EMC to trigger on jets and direct photons was studied for trigger level 0. Trigger efficiencies and expected process rates were obtained for pp reactions. Results from pp interactions will be essential to the interpretation of AuAu results as well as for the spin physics program. These studies were performed with the standard STAR software chain which includes GEANT and EMC simulations. The HIJING event generator was used to provide input for the simulations.
Date:
March 21, 1999
Creator:
BELT-TONJES,M. FOR THE STAR COLLABORATION
Object Type:
Article
System:
The UNT Digital Library
Soft X-Ray Measurements of Z-Pinch-Driven Vacuum Hohlraums
This article reports the experimental characterization of a z-pinch driven-vacuum hohlraum. The authors have measured soft x-ray fluxes of 5 x 10{sup 12} W/cm{sup 2} radiating from the walls of hohlraums which are 2.4--2.5 cm in diameter by 1 cm tall. The x-ray source used to drive these hohlraums was a z-pinch consisting of a 300 wire tungsten array driven by a 2 MA, 100 ns current pulse. In this hohlraum geometry, the z-pinch x-ray source can produce energies in excess of 800 kJ and powers in excess of 100 TW to drive these hohlraums. The x-rays released in these hohlraums represent greater than a factor of 25 in energy and more than a factor of three in x-ray power over previous laboratory-driven hohlraums.
Date:
July 21, 1999
Creator:
Baker, K. L.; Porter, J. L.; Ruggles, L. E.; Chandler, G. A.; Deeney, Chris; Vargas, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Practical superconductor development for electrical power applications -- Annual report for FY 1999
Development of useful high-Tc superconductors requires synthesis of superconducting compounds; fabrication of wires, tapes, and films from these compounds; production of composite structures that incorporate stabilizers or insulators; and design and testing of efficient components. This report describes FY 1998 technical progress of research and development efforts aimed at producing superconducting components in the Bi(Pb)SrCaCu and YBaCu oxide systems. Topics discussed are synthesis and heat treatment of high-Tc superconductors, formation of monolithic and composite conductors, characterization of structures and superconducting and mechanical properties, and fabrication and testing of prototype components. Collaborations with industry and academia are documented.
Date:
December 21, 1999
Creator:
Balachandran, U.; Askew, T.R. & Cha, Y.S.
Object Type:
Report
System:
The UNT Digital Library
Reduction and precipitation of neptunium(V) by sulfate-reducing bacteria.
Migration of neptunium, as NpO{sub 2}{sup +}, has been identified as a potentially important pathway for actinide release at nuclear waste repositories and existing sites of subsurface contamination. Reduction of Np(V) to Np(IV) will likely reduce its volubility, resulting in lowered subsurface migration. The ability of sulfate-reducing bacteria (SRB) to utilize Np(V) as an electron acceptor was investigated, because these bacteria are active in many anaerobic aquifers and are known to facilitate the reduction of metals and radionuclides. Pure and mixed cultures of SRB were able to precipitate neptunium during utilization of pyruvate, lactate, and hydrogen as electron donors in the presence and absence of sulfate. The neptunium in the precipitate was identified as Np(IV) using X-ray absorption near edge spectroscopy (XANES) analysis. In mixed-culture studies, the addition of hydrogen to consortia grown by pyruvate fermentation stimulated neptunium reduction and precipitation. Experiments with pure cultures of Desulfovibrio vulgaris, growing by lactate fermentation in the absence of sulfate or by sulfate reduction, confirm that the organism is active in neptunium reduction and precipitation. Based on our results, the activity of SRB in the subsurface may have a significant, and potentially beneficial, impact on actinide mobility by reducing neptunium volubility.
Date:
October 21, 1999
Creator:
Banaszak, J. E.; Rittmann, B. E. & Reed, D. T.
Object Type:
Article
System:
The UNT Digital Library
News Bulletin (Castroville, Tex.), Vol. 41, No. 42, Ed. 1 Thursday, October 21, 1999
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 21, 1999
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Material Protection, Control, and Accountancy (MPC&A) Sustainability
To date, the Department of Energy's (DOE) Material Protection, Control, and Accountancy (MPC and A) program has assisted in the implementation of operational site-wide MPC and A systems at several nuclear facilities in Russia. Eleven sites from the civilian sector have completed the site-wide installations and two have completed sub-site installations. By the end of 1999, several additional sites will have completed site-wide and sub-site system installations through DOE assistance. the effort at the completed sites has focused primarily on the design, integration, and installation of upgraded MPC and A systems. In most cases, little work has been performed to ensure that the installed systems will be sustained. Because of concerns that the installed systems would not be operated in the future, DOE established a sustainability pilot program involving the 11 sites. The purpose of DOE's MPC and A Sustainability Program is to ensure that MPC and A upgrades installed at sites in Russia are effective and will continue to operate over the long term. The program mission is to work with sites where rapid upgrades have been completed to cultivate enduring and consistent MPC and A practices. The program attempts to assist the Russian sites to develop MPC and …
Date:
July 21, 1999
Creator:
Baumann, Mark; Farmer, James; Haase, Michael; Mann, Greg; Soo Hoo, Mark & Toth, William
Object Type:
Article
System:
The UNT Digital Library
Evaluation of the 1998 Predictions of the Run-Timing of Wild Migrant Yearling Chinook and Water Quality at Multiple Locations on the Snake and Columbia Rivers using CRiSP/RealTime, 1998 Technical Report.
Since 1988, wild salmon have been PIT-tagged through monitoring and research programs conducted by the Columbia River fisheries agencies and Tribes. Workers at the University of Washington have used detection data at Lower Granite Dam to generate predictions of arrival distributions for various stocks at the dam. The prediction tool is known as RealTime. In 1996, RealTime predictions were linked to a downstream migration model, CRiSP.1. The composite model, known as CRiSP/RealTime, predicts the arrival distribution and fraction transported at downriver locations.
Date:
July 21, 1999
Creator:
Beer, W. Nicholas; Hayes, Joshua A. & Shaw, Pamela
Object Type:
Report
System:
The UNT Digital Library
Work of Adhesion Measurements of Silicone Networks Using Contract Mechanics
Work of adhesion (Wa) measurements are being studied for several types of polymer/metal combinations in order to obtain a better understanding of the adhesive failure mechanisms for systems containing encapsulated and bonded components. A primary concern is whether studies of model systems can be extended to systems of technological interest. One study performed in our laboratory involved the determination of Wa between silicone (PDMS) and Al surfaces in order to establish potential adhesive failure mechanisms. Our initial work with PDMS was based on Dow Corning 170 Sylgard. PDMS hemispheres were synthesized following the procedure outlined by Chaudhury and Whitesides where the filler was stripped from the commercial silicone by centrifuging. Wa between PDMS surfaces was determined using the JKR method. Our results for the Wa of PDMS were in agreement with those reported by Chaudhury and Whitesides. However, further JKR studies using these PDMS hemispheres on flat Al surfaces were fraught with difficulty. We could not discriminate hydrogen-bonding effects between Al{sub 2}O{sub 3} and hydroxyl groups in the PDMS and other possible bonding mechanisms. It was suggested that commercial systems contain inhibitors and additives that interfere with understanding the PMDS/Al interface. Therefore, the current study uses pure PDMS networks synthesized …
Date:
April 21, 1999
Creator:
Benkoski, Jason; Emerson, John A.; Miller, Gregory V. & Pearson, Raymond A.
Object Type:
Article
System:
The UNT Digital Library