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ADVANCING THE ION BEAM THIN FILM PLANARIZATION PROCESS FOR THE SMOOTHING OF SUBSTRATE PARTICLES

Description: For a number of technologies small substrate contaminants are undesirable, and for one technology in particular, extreme ultraviolet lithography (EUVL), they can be a very serious issue. We have demonstrated that the Ion Beam Thin Film Planarization Process, a coating process designed to planarize substrate asperities, can be extended to smooth {approx}70 nm and {approx}80 nm diameter particles on EUVL reticle substrates to a height of {approx}0.5 nm, which will render them noncritical in an EU… more
Date: October 19, 2004
Creator: Mirkarimi, P B; Spiller, E; Baker, S L; Robinson, J C; Stearns, D G; Liddle, J A et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analysis of High-n Dielectronic Rydberg Satellites in the Spectra of Na-like ZnXX and Mg-like ZnXIX

Description: We have observed spectra from highly charged zinc ions in a variety of laser-produced plasmas. Spectral features that are Na- and Mg-like satellites to high-n Rydberg transitions in the Ne-like ZnXXI spectrum are analyzed and modeled. Identifications and analysis are made by comparison with highly accurate atomic structure calculations and steady state collisional-radiative models. Each observed ZnXX and ZnXIX feature comprises up to {approx} 2 dozen individual transitions, these transitions ar… more
Date: February 19, 2004
Creator: Petrocelli, G; Vinogradov, V I; Magunov, A I; Flora, F; Martellucci, S; Matafonov, A P et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Analytic, High-beta Solutions of the Helical Grad-Shafranov Equation

Description: We present analytic, high-beta ({beta} {approx} O(1)), helical equilibrium solutions for a class of helical axis configurations having large helical aspect ratio, with the helix assumed to be tightly wound. The solutions develop a narrow boundary layer of strongly compressed flux, similar to that previously found in high beta tokamak equilibrium solutions. The boundary layer is associated with a strong localized current which prevents the equilibrium from having zero net current.
Date: May 19, 2004
Creator: Smith, D. R. & Reiman, A. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Anomalous Skin Effect for Anisotropic Electron Velocity Distribution Function

Description: The anomalous skin effect in a plasma with a highly anisotropic electron velocity distribution function (EVDF) is very different from skin effect in a plasma with the isotropic EVDF. An analytical solution was derived for the electric field penetrated into plasma with the EVDF described as a Maxwellian with two temperatures Tx >> Tz, where x is the direction along the plasma boundary and z is the direction perpendicular to the plasma boundary. The skin layer was found to consist of two di… more
Date: February 19, 2004
Creator: Kaganovich, Igor; Startsev, Edward & Shvets, Gennady
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An Approach to Estimate the Localized Effects of an Aircraft Crash on a Facility

Description: Aircraft crashes are an element of external events required to be analyzed and documented in facility Safety Analysis Reports (SARs) and Nuclear Explosive Safety Studies (NESSs). This paper discusses the localized effects of an aircraft crash impact into the Device Assembly Facility (DAF) located at the Nevada Test Site (NTS), given that the aircraft hits the facility. This was done to gain insight into the robustness of the DAF and to account for the special features of the DAF that enhance it… more
Date: April 19, 2004
Creator: Kimura, C; Sanzo, D & Sharirli, M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ASIC Development for Three-Dimensional Silicon Imaging Array for Cold Neutrons

Description: An Integrated Circuit (IC) readout chip with four channels arranged so as to receive input charge from the corners of the chip was designed for use with 5- to 7-mm pixel detectors. This Application Specific IC (ASIC) can be used for cold neutron imaging, for study of structural order in materials using cold neutron scattering or for particle physics experiments. The ASIC is fabricated in a 0.5-{micro}m n-well AMI process. The design of the ASIC and the test measurements made is reported. Noise … more
Date: May 19, 2004
Creator: Britton, C.L.; Jagadish, U. & Bryan, W.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Atomic Control Of Water Interaction With Biocompatible Surfaces: The Case Of SiC(001)

Description: The interaction of water with Si- and C- terminated {beta}-SiC(001) surfaces was investigated by means of ab initio molecular dynamics simulations. Irrespective of coverage, varied from 1/4 to 1 monolayer, we found that water dissociates on the Si-terminated surface, substantially modifying the clean surface reconstruction, while the C-terminated surface is nonreactive and hydrophobic. Based on our results, we propose that STM images and photoemission experiments may detect specific changes ind… more
Date: July 19, 2004
Creator: Cicero, G; Catellani, A & Galli, G
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Babel 1.0 Release Criteria: A Working Document

Description: In keeping with the Open Source tradition, we want our Babel 1.0 release to indicate a certain level of capability, maturity, and stability. From our first release (version 0.5.0) in July of 2001 to our current (18th) release (version 0.9.6) we have continued to add capabilities in response to customer feedback, our observations in the field, and a consistent vision for interoperability. The key to our maturity is without a doubt the ever-increasing demands of our growing user base... both in t… more
Date: October 19, 2004
Creator: Kumfert, Gary; Dahlgren, Tamara; Epperly, Thomas & Leek, James
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Benchmarking: More Aspects of High Performance Computing

Description: The original HPL algorithm makes the assumption that all data can be fit entirely in the main memory. This assumption will obviously give a good performance due to the absence of disk I/O. However, not all applications can fit their entire data in memory. These applications which require a fair amount of I/O to move data to and from main memory and secondary storage, are more indicative of usage of an Massively Parallel Processor (MPP) System. Given this scenario a well designed I/O architectur… more
Date: December 19, 2004
Creator: Ravindrudu, Rahul
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Capstone Depleted Uranium Aerosols: Generation and Characterization

Description: In a study designed to provide an improved scientific basis for assessing possible health effects from inhaling depleted uranium (DU) aerosols, a series of DU penetrators was fired at an Abrams tank and a Bradley fighting vehicle. A robust sampling system was designed to collect aerosols in this difficult environment and continuously monitor the sampler flow rates. Aerosols collected were analyzed for uranium concentration and particle size distribution as a function of time. They were also ana… more
Date: October 19, 2004
Creator: Parkhurst, MaryAnn; Szrom, Fran; Guilmette, Ray; Holmes, Tom; Cheng, Yung-Sung; Kenoyer, Judson L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Carbon Sequestration on Surface Mine Lands Quarterly Report

Description: The January-March 2004 Quarter was dedicated to tree planting activities in two locations in Kentucky. During year one of this project there was no available mine land to plant in the Hazard area so 107 acres were planted in the Martin county mine location. This year 120 acres was planted in the Hazard area to compensate for the prior year and an additional 57 acres was planted on Peabody properties in western Kentucky. An additional set of special plots were established on each of these areas … more
Date: May 19, 2004
Creator: Graves, Donald H.; Barton, Christopher; Sweigard, Richard & Warner, Richard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chamber-transport simulation results for heavy-ion fusion drivers

Description: The heavy-ion fusion (HIF) community recently developed a power-plant design that meets the various requirements of accelerators, final focus, chamber transport, and targets. The point design is intended to minimize physics risk and is certainly not optimal for the cost of electricity. Recent chamber-transport simulations, however, indicate that changes in the beam ion species, the convergence angle, and the emittance might allow more-economical designs.
Date: October 19, 2004
Creator: Sharp, W. M.; Callahan, D. A.; Tabak, M.; Yu, S. S.; Peterson, P. F.; Rose, D. V. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characterization of In-SITU Stress and Permeability in Fractured Reservoirs

Description: Expanded details and additional results are presented on two methods for estimating fracture orientation and density in subsurface reservoirs from scattered seismic wavefield signals. In the first, fracture density is estimated from the wavenumber spectra of the integrated amplitudes of the scattered waves as a function of offset in pre-stack data. Spectral peaks correctly identified the 50m, 35m, and 25m fracture spacings from numerical model data using a 40Hz source wavelet. The second method… more
Date: July 19, 2004
Creator: Burns, Daniel R. & Toksoz, M. Nafi
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chromatographic Separations of Enantiomers and Underivatized Oligosaccharides

Description: My graduate research has focused on separation science and bioanalytical analysis, which emphasized in method development. It includes three major areas: enantiomeric separations using high performance liquid chromatography (HPLC), Super/subcritical fluid chromatography (SFC), and capillary electrophoresis (CE); drug-protein binding behavior studies using CE; and carbohydrate analysis using liquid chromatograph-electrospray ionization mass spectrometry (LC-ESI-MS). Enantiomeric separations cont… more
Date: December 19, 2004
Creator: Liu, Ying
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Clean Steel: Advancing the State of the Art (TRP 0003)

Description: This project had 3 objectives: (1) to determine the kinetic factors governing inclusion removal from liquid steels at a slag metal interface; (2) to develop a methodology to enable steels of less than 1 ppm total oxygen to be produced with an average inclusion diameter of less than 5 {micro}m; and, (3) to determine the slag-metal interface conditions necessary for ultra clean steels. In objectives 1, and 3, the major finding was that dissolution rates of solid particles in slags were found to b… more
Date: May 19, 2004
Creator: Seetharaman, Sridhar & Cramb, Alan W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Clothes washer standards in China -- The problem of water andenergy trade-offs in establishing efficiency standards

Description: Currently the sales of clothes washers in China consist ofseveral general varieties. Some use more energy (with or withoutincluding hot water energy use) and some use more water. Both energy andwater are in short supply in China. This poses the question - how do youtrade off water versus energy in establishing efficiency standards? Thispaper discusses how China dealt with this situation and how itestablished minimum efficiency standards for clothes washers.
Date: May 19, 2004
Creator: Biermayer, Peter J. & Lin, Jiang
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

CO2 SELECTIVE CERAMIC MEMBRANE FOR WATER-GAS SHIFT REACTION WITH CONCOMITANT RECOVERY OF CO2

Description: Two process schemes have been investigated by us for the use of hydrotalcites we prepared as CO{sub 2} adsorbents to enhance water gas shift (WGS) reaction: Case I involves the adsorption enhanced WGS packed bed reactor and Case II involves the adsorption enhanced WGS membrane reactor. Both cases will achieve the same objective as the hydrotalcite membrane reactor: i.e., improving the WGS reactor efficiency via the concomitant removal of CO{sub 2} for sequestration. In this report a detailed in… more
Date: February 19, 2004
Creator: Liu, Paul K. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Comprehensive Study of Surface Chemistry for Application to Engine NOx Aftertreatment

Description: This work focuses on developing a scientific understanding of the processes associated with NO{sub x} trap operation. NO{sub x} traps are the most advanced technology for achieving future emissions standards with diesel engines. Successful development of NO{sub x} traps will allow widespread use of diesel engines in light-duty vehicles, reducing oil imports by as much as 60%. Diesel engines have a high efficiency and low maintenance that makes them the ideal choice for transportation applicatio… more
Date: February 19, 2004
Creator: Aceves, S M; Piggot, T; Pitz, W; Mundy, C; Kuo, W & Havstad, M
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Core of NGC 6240 from Keck Adaptive Optics and HST NICMOS Observations

Description: We present results of near infrared imaging of the disk-galaxy-merger NGC 6240 using adaptive optics on the Keck II Telescope and reprocessed archival data from NICMOS on the Hubble Space Telescope. Both the North and South nuclei of NGC 6240 are clearly elongated, with considerable sub-structure within each nucleus. In K' band there are at least two point-sources within the North nucleus; we tentatively identify the south-western point-source within the North nucleus as the position of one of … more
Date: November 19, 2004
Creator: Max, C. E.; Canalizo, G.; Macintosh, B. A.; Raschke, L.; Whysong, D.; Antonucci, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Coupling Temperature Control with Electrochemically Modulated Liquid Chromatography: Fundamental Aspects and Applications

Description: The primary focus of the doctoral research presented herein has been the integration of temperature control into electrochemically modulated liquid chromatography (EMLC). The combination of temperature control and the tunable characteristics of carbonaceous EMLC stationary phases have been invaluable in deciphering the subtleties of the retention mechanism. The effects of temperature and E{sub app} on the retention of several naphthalene disulfonates were therefore examined by the van' Hoff rel… more
Date: December 19, 2004
Creator: Ponton, Lisa M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Critical Behavior of Thermal Expansion and Magnetostriction in the Vicinity of the First order transition at the Curie Point of Gd5(SixGe1-x)4

Description: Thermal expansion (TE) and magnetostriction (MS) measurements have been conducted for Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} with a series of x values to study its critical behavior in the vicinity of transition temperatures. It was found that the Curie temperature of Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} for x 0 {approx} 0.5 is dependent on magnetic field, direction of change of temperature (Tc on cooling was lower than Tc on heating), purity of Gd starting material, compositions, material pr… more
Date: December 19, 2004
Creator: Han, Mangui
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Design Aspects of an MSE Diagnostic for ITER

Description: The Motional Stark Effect (MSE) diagnostic is unique in its ability to measure the current profile and will be essential in ITER for detailed analysis of Advanced Tokamak (AT) and other types of discharges. However, design of a MSE diagnostic for ITER presents many unique challenges. Among these is optical analysis for the convoluted optical path, required for effective neutron shielding, that employs several reflective optics arranged to form a labyrinth. The geometry of the diagnostic has bee… more
Date: April 19, 2004
Creator: Casper, T.; Jayakumar, J.; Makowski, M. & Ellis, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design, fabrication, and characterization of high-efficiency extreme ultraviolet diffusers

Description: As the development of extreme ultraviolet (EUV) lithography progresses, interest grows in the extension of traditional optical components to the EUV regime. The strong absorption of EUV by most materials and its extremely short wavelength, however, makes it very difficult to implement many components that are commonplace in the longer wavelength regimes. One such example is the diffuser often implemented with ordinary ground glass in the visible light regime. Here we demonstrate the fabrication… more
Date: February 19, 2004
Creator: Naulleau, Patrick P.; Liddle, J. Alexander; Salmassi, Farhad; Anderson, Erik H. & Gullikson, Eric M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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