13 Matching Results

Search Results

Results: 1 - 13
open access

The team workshops: What`s old? What`s new?

Description: A short history of the TEAM workshops is presented, with emphasis on the first two rounds of workshops and the recent workshops in Berlin and Okayama. New problems provide benchmarks for new applications and interest, but old problems continue to provide benchmarks for new methods and approaches. There is a trend to attempt to solve more and more complicated problems on a personal computer (PC). Problem 8 (a slot in a conducting plate) has been solved on a PC using the eddy- current code ELEKTR… more
Date: October 29, 1996
Creator: Turner, L. R.
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

Assessment of first wall damage from target x-ray emission and scattered laser light for the National Ignition Facility

Description: Predictions for NIF ICF target x-ray emission are presented. Validation experiments confirm the key features of the x-ray emissions and their effects on the NIF chamber B{sub 4}C first wall. Predictions of a possible first wall 0.35-{mu}m laser radiation compared to more experimental results conducted to determine B{sub 4}C response all suggest B{sub 4}C is an acceptable first wall material.
Date: May 29, 1996
Creator: Tobin, M.T.; Anderson, A.; Burnham, A. & Bernat, T.
Partner: UNT Libraries Government Documents Department
open access

Quantification of seismic liquefaction risk

Description: Explicit goals of acceptable risk for natural phenomena hazards (earthquake, extreme wind, and flood) have been established by the Department of Energy (DOE) 1994. Closely associated to the earthquake risk is the issue of seismically-induced liquefaction. Because deterministic methods currently available to answer the question to whether a site is liquefiable or not are incapable of providing a clue as to the likelihood or risk of liquefaction, the application of the criteria to a given facilit… more
Date: February 29, 1996
Creator: Arango, I.; Ostadan, F.; Lewis, M. R. & Gutierrez, B. J.
Partner: UNT Libraries Government Documents Department
open access

Computational modeling of ultra-short-pulse ablation of enamel

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 sec 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 thermodynami… more
Date: February 29, 1996
Creator: London, R. A.; Bailey, D. S. & Young, D. A.
Partner: UNT Libraries Government Documents Department
open access

Demonstration of a vapor density monitoring system using UV radiation generated from quasi-phasematched SHG waveguide devices

Description: Many industrial applications require non-intrusive diagnostics for process monitoring and control. One example is the physical vapor deposition of titanium alloys. In this paper we present a system based on laser absorption spectroscopy for monitoring titanium vapor. Appropriate transitions for monitoring high rate vaporization of titanium require extension of available IR diode technology to the UV. The heart of this vapor density monitoring system is the 390nm radiation generated from quasi-p… more
Date: January 29, 1996
Creator: Galanti, S. A.; Berzins, L. V.; Brown, J. B.; Tamosaitis, R. S.; Bortz, M. L.; Day, T. et al.
Partner: UNT Libraries Government Documents Department
open access

Eliminating the possibility at Chernobyl 4 of recriticality with positive feedback

Description: We have recently published an article in which we discuss means by which plutonium and other fissile material stored underground could reach criticality with positive feedback and therefore explosive potential. The Chernobyl rubble involving hundreds of tons of material is similar in some respects to the systems analyzed in the paper, and the practices there to control criticality may well increase the probability of a second event at Chernobyl 4. This paper explores the Chernobyl situation and… more
Date: April 29, 1996
Creator: Bowman, C. D.
Partner: UNT Libraries Government Documents Department
open access

Interactive Layout Mechanisms for Image Database Retrieval

Description: In this paper we present a user interface, CANDID Camera, for image retrieval using query-by-example technology. Included in the interface are several new layout algorithms based on multidimensional scaling techniques that visually display global and local relationships between images within a large image database. We use the CANDID project algorithms to create signatures of the images, and then measure the dissimilarity between the signatures. The layout algorithms are of two types. The first … more
Date: January 29, 1996
Creator: MacCuish, John; McPherson, Allen; Barros, Julio & Kelly, Patrick
Partner: UNT Libraries Government Documents Department
open access

RFQ-based, transportable, high-resolution, neutron radiography system concept

Description: A preliminary design for a high-resolution transportable neutron radiography system concept has been developed. The system requirement has been taken to be a thermal neutron flux of 10{sup 6} N/(cm{sup 2}- sec) with an L/D of 100. The approach is to use an accelerator-driven neutron source, with a radiofrequency quadrupole (RFQ) as the primary accelerator component. Initial concepts for all of the major components of the system have been developed, and selected key parts have been examined furt… more
Date: May 29, 1996
Creator: Gillespie, G.H.; McMichael, G.E.; Micklich, B.J. & Imel, G.R.
Partner: UNT Libraries Government Documents Department
open access

Neutron activation for ITER

Description: There are three primary goals for the Neutron Activation system for ITER: maintain a robust relative measure of fusion power with stability and high dynamic range (7 orders of magnitude); allow an absolute calibration of fusion power (energy); and provide a flexible and reliable system for materials testing. The nature of the activation technique is such that stability and high dynamic range can be intrinsic properties of the system. It has also been the technique that demonstrated (on JET and … more
Date: April 29, 1996
Creator: Barnes, C. W.; Loughlin, M. J. & Nishitani, Takeo
Partner: UNT Libraries Government Documents Department
open access

Perpendicular giant magnetoresistance in a 0.4 {mu}m diameter multilayer sensor

Description: We have fabricated a novel GMR ML flux sensor that is designed to operate in the CPP mode. The GMR sensor is a 0.4 {mu}m diameter, 0.09 {mu}m high Cu-Co ML pedestal. The sensors are patterned using electron beam lithography. The Al{sub 2}O{sub 3}-TiC substrate is coated with a sputter deposited Al{sub 2}O{sub 3} film that is polished to <0.2 nm RMS roughness. Contact to the bottom of the GMR sensor is made by depositing the Cu-Co multilayers onto a smooth 0.45 {mu}m thick Mo-Si ML stack. The to… more
Date: February 29, 1996
Creator: Spallas, J. & Huai, Y., Vernon, S.
Partner: UNT Libraries Government Documents Department
open access

Status of thermal loading evaluations for a potential repository

Description: The effect that thermal loading has on the natural and engineered systems needs to be understood and demonstrated with reasonable assurance in the Viability Assessment and the License Application process for a potential underground high level waste repository at Yucca Mountain. Thermal loading can be defined in a number of ways but it basically is the amount of decay heat from the spent nuclear fuel produced per unit area and is related to the emplacement density of fuel. This paper provides an… more
Date: January 29, 1996
Creator: Saterlie, S. F.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen