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Sun-Climate Complexity Linking

Description: Article discussing sun-climate complexity linking and how this property is a consequence of the phenomenon of information transfer.
Date: February 29, 2008
Creator: West, Bruce J. & Grigolini, Paolo
Partner: UNT College of Arts and Sciences
open access

Electric-dipole 5s - 5p Transitions in Promethiumlike Ions

Description: The 5s-5p electric-dipole resonance transitions in highly ionized promethiumlike ions have been studied applying relativistic multi-reference Moeller-Plesset second-order perturbation theory. The transition wavelengths are determined to within 0.2 {angstrom} in the more highly charged ions, where the level degeneracies are small. For somewhat lighter ions a very large reference space was used in order to account for the many degeneracies. In order to calculate transition probabilities and lifet… more
Date: February 29, 2008
Creator: Vilkas, M J; Ishikawa, Y & Trabert, E
Partner: UNT Libraries Government Documents Department
open access

High Energy Neutrinos from the Cold: Status and Prospects of the IceCube Experiment

Description: The primary motivation for building neutrino telescopes is to open the road for neutrino astronomy, and to offer another observational window for the study of cosmic ray origins. Other physics topics, such as the search for WIMPs, can also be developed with neutrino telescope. As of March 2008, the IceCube detector, with half of its strings deployed, is the world largest neutrino telescope taking data to date and it will reach its completion in 2011. Data taken with the growing detector are bei… more
Date: February 29, 2008
Creator: Collaboration, IceCube; Portello-Roucelle, Cecile & Collaboration, IceCube
Partner: UNT Libraries Government Documents Department
open access

Prototyping of the ILC Baseline Positron Target

Description: The ILC positron system uses novel helical undulators to create a powerful photon beam from the main electron beam. This beam is passed through a titanium target to convert it into electron-positron pairs. The target is constructed as a 1 m diameter wheel spinning at 2000 RPM to smear the 1 ms ILC pulse train over 10 cm. A pulsed flux concentrating magnet is used to increase the positron capture efficiency. It is cooled to liquid nitrogen temperatures to maximize the flatness of the magnetic fi… more
Date: February 29, 2012
Creator: Gronberg, J.; Brooksby, C.; Piggott, T.; Abbott, R.; Javedani, J. & Cook, E.
Partner: UNT Libraries Government Documents Department
open access

Considerations For Contractile Electroactive Materials and Actuators

Description: Electroactive polymers (EAPs) that bend, swell, ripple (first generation materials), and now contract with low electric input (new development) have been produced. The mechanism of contraction is not well understood. Radionuclide-labeled experiments, molecular modeling, electrolyte experiments, pH experiments, and an ionic concentration experiment were used to determine the chain of events that occur during contraction and, reciprocally, expansion when the polarity is reversed, in these ionic E… more
Date: February 29, 2012
Creator: Lenore Rasmussen, Lewis D. Meixler and Charles A. Gentile
Partner: UNT Libraries Government Documents Department
open access

The Mass Distribution and Assembly of the Milky Way from the Properties of the Magellanic Clouds

Description: We present a new measurement of the mass of the Milky Way (MW) based on observed properties of its largest satellite galaxies, the Magellanic Clouds (MCs), and an assumed prior of a {Lambda}CDM universe. The large, high-resolution Bolshoi cosmological simulation of this universe provides a means to statistically sample the dynamical properties of bright satellite galaxies in a large population of dark matter halos. The observed properties of the MCs, including their circular velocity, distance … more
Date: February 29, 2012
Creator: Busha, Michael T.; Marshall, Philip J.; Wechsler, Risa H.; Klypin, Anatoly & Primack, Joel
Partner: UNT Libraries Government Documents Department
open access

New Capabilities and Results for the National Spherical Torus Experiment

Description: The National Spherical Torus Experiment (NSTX) produces plasmas with toroidal aspect ratio as low as 1.25, which can be heated by up to 6 MW High-Harmonic Fast Waves and up to 7 MW of deuterium Neutral Beam Injection. Using new poloidal fields coils, plasmas with cross-section elongation up to 2.7, triangularity 0.8, plasma currents Ip up to 1.5 MA and normalized currents Ip/a⋅BT up to 7.5 MA/m⋅T have been achieved. A significant extension of the plasma pulse length, to 1.5 s at a plasma curren… more
Date: February 29, 2008
Creator: M.G. Bell, R.E. Bell, D.A. Gates, S.M. Kaye, H. Kugel, B.P. LeBlanc, F.M. Levinton, R. Maingi, J.E. Menard, R. Raman, S.A. Sabbagh, D. Stutman and the NSTX Research Team
Partner: UNT Libraries Government Documents Department
open access

ADVANCED OXIDATION: OXALATE DECOMPOSITION TESTING WITH OZONE

Description: At the Savannah River Site (SRS), oxalic acid is currently considered the preferred agent for chemically cleaning the large underground Liquid Radioactive Waste Tanks. It is applied only in the final stages of emptying a tank when generally less than 5,000 kg of waste solids remain, and slurrying based removal methods are no-longer effective. The use of oxalic acid is preferred because of its combined dissolution and chelating properties, as well as the fact that corrosion to the carbon steel t… more
Date: February 29, 2012
Creator: Ketusky, E. & Subramanian, K.
Partner: UNT Libraries Government Documents Department
open access

An Experimental Investigation of a Prescription for Identifying Plastic Strain

Description: A series of experiments is described in which a novel prescription for the identification of plastic strain is tested to determine its validity in the context of the strain-space formulation of rate-independent plasticity. Biaxial experiments were performed on several thin-walled aluminum 1100-O cylindrical specimens.
Date: February 29, 2000
Creator: Brown, A. A.; Casey, J. & Nikkel, D. J.
Partner: UNT Libraries Government Documents Department
open access

Auto-scoping for OpenMP tasks

Description: No Description Available.
Date: February 29, 2012
Creator: Royuela, S.; Duran, A.; Liao, C. & Quinlan, D.
Partner: UNT Libraries Government Documents Department
open access

Characterization of oxynitride dielectric films grown in NO/O{sub 2} mixtures by rapid thermal oxynitridation

Description: Ultra-thin oxynitride films were grown on Si by direct rapid thermal processing (RTP) oxynitridation in NO/O{sub 2} ambients with NO concentrations from 5% to 50%. During oxynitridation, nitrogen accumulated at the Si/dielectric interface and the average concentration of in N through the resulting films ranged from 0.3 to 3.0 atomic percent. The average concentration of N in the films increased with increasing NO in the ambient gas, but decreased with longer RTP times. The maximum N concentrati… more
Date: February 29, 2000
Creator: Everist, Sarah C.; Meisenheimer, Timothy L.; Nelson, Gerald C. & Smith, Paul Martin
Partner: UNT Libraries Government Documents Department
open access

Radon Reduction Experience at a Former Uranium Processing Facility

Description: Approximately 6,200 cubic meters of waste containing about 2.0E8 MBq of radium-226 are stored in two large silos at the Fernald Site in southwest Ohio. The material is scheduled for retrieval, packaging, off site shipment and disposal by burial. Air in the silos above the stored material contained radon-222 at a concentration of 7.4 E5 Bq/L. Short-lived daughters formed by decay in these headspaces generated dose rates at contact with the top of the silos up to 1.05 mSv/hr and there complicate … more
Date: February 29, 2004
Creator: Eger, K. J.; Rutherford, L.; Rickett, K.; Fellman, R. & Hungate, S.
Partner: UNT Libraries Government Documents Department
open access

Large GMR values of sputtered Co/Cu multilayer structures with Co-Cu buffer layers

Description: We demonstrate large giant magnetoresistance (GMR) values of Co/Cu multilayers (MLs) sputtered on combined Co18{angstrom}/Cu48{angstrom} buffer layer. GMR values at room temperature reach 62% at the first antiferromagnetically (AF) coupling peak and 33% at the 2nd AF coupled peak, which are very close to those found in Co/Cu MLs sputtered on a Fe buffer layer. The large GMR effect is attributed to the superior superlattice structure of these samples, as evidenced by the x-ray reflectivity data … more
Date: February 29, 1996
Creator: Huai, Y.; Vernon, S.P.; Stearns, D.G.; Cerjan, C. & Kania, D.R.
Partner: UNT Libraries Government Documents Department
open access

Hydrodynamic model for ultra-short pulse ablation of hard dental tissue

Description: A computational model for the ablation of tooth enamel by ultra-short laser pulses is presented. The role of simulations using this model in designing and understanding laser drilling systems is discussed. Pulses of duration 300 fsec and intensity greater than 10{sup 12} W/cm{sup 2} are considered. Laser absorption proceeds via multi-photon initiated plasma mechanism. The hydrodynamic response is calculated with a finite difference method, using an equation of state constructed from thermodynam… more
Date: February 29, 1996
Creator: London, R. A.; Bailey, D. S.; Young, D. A.; Alley, W. E.; Feit, M. D.; Rubenchik, A. M. et al.
Partner: UNT Libraries Government Documents Department
open access

Development of reference materials for SNF NDA systems

Description: The Department of Energy has over 200 different fuel types which will be placed in a geologic repository for ultimate disposal. At the present time, DOE EM is responsible for assuring safe existing conditions, achieving interim storage, and preparing for final disposition. Each task is governed by regulations which dictate a certain degree of knowledge regarding the contents and condition of the fuel. This knowledge and other associated characteristics are referred to as data needs. It is the s… more
Date: February 29, 2000
Creator: Klann, R. T.
Partner: UNT Libraries Government Documents Department
open access

Recordkeeping in the decommissioning process

Description: In the US, there are two sets of key decommissioning records clearly identified -- those that are essential for planning the D and D of a facility and then those that are the result of the decommissioning process itself. In some cases, the regulatory authorities require and in others advise the licensees of the records that may be useful or which are required to be kept from the decommissioning. In the remainder of the paper, the author attempts to highlight some important aspects of decommissi… more
Date: February 29, 2000
Creator: Boing, L. E.
Partner: UNT Libraries Government Documents Department
open access

Tensile instabilities for porous plasticity models

Description: Several concepts (and assumptions) from the literature for porous metals and ceramics have been synthesized into a consistent model that predicts an admissibility limit on a material's porous yield surface. To ensure positive plastic work, the rate at which a yield surface can collapse as pores grow in tension must be constrained.
Date: February 29, 2000
Creator: BRANNON,REBECCA M.
Partner: UNT Libraries Government Documents Department
open access

Experimental-based modeling of a support structure as part of a full system model

Description: Structural dynamic systems are often attached to a support structure to simulate proper boundary conditions during testing. In some cases the support structure is fairly simple and can be modeled by discrete springs and dampers. In other cases the desired test conditions necessitate the use of a support structural that introduces dynamics of its own. For such cases a more complex structural dynamic model is required to simulate the response of the full combined system. In this paper experimenta… more
Date: February 29, 2000
Creator: CARNE,THOMAS G. & DOHRMANN,CLARK R.
Partner: UNT Libraries Government Documents Department
open access

Finite element based electrostatic-structural coupled analysis with automated mesh morphing

Description: A co-simulation tool based on finite element principles has been developed to solve coupled electrostatic-structural problems. An automated mesh morphing algorithm has been employed to update the field mesh after structural deformation. The co-simulation tool has been successfully applied to the hysteric behavior of a MEMS switch.
Date: February 29, 2000
Creator: Owen, Steven J.; Zhulin, V. I. & Ostergaard, D. F.
Partner: UNT Libraries Government Documents Department
open access

Characterization of electrical linewidth test structures patterned in (100) Silicon-on-Insulator for use as CD standards

Description: This paper describes the fabrication and measurement of the linewidths of the reference segments of cross-bridge resistors patterned in (100) Bonded and Etched Back Silicon-on-Insulator (BESOI) material. The critical dimensions (CD) of the reference segments of a selection of the cross-bridge resistor test structures were measured both electrically and by Scanning-Electron Microscopy (SEM) cross-section imaging. The reference-segment features were aligned with <110> directions in the BESO… more
Date: February 29, 2000
Creator: Cresswell, M. W.; Allen, R. A.; Ghoshtagore, R. N.; Guillaume, N. M. P.; Shea, Patrick J.; Everist, Sarah C. et al.
Partner: UNT Libraries Government Documents Department
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