11 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Particles"  
Results: 1 - 11
open access

Alpha-Driven Alfven Instabilities and Velocity Shear Effects

Description: Energetic particle populations such as fusion alphas, beams and RF tails can drive a wide variety of shear Alfven instabilities in toroidal confinement systems. These instabilities lead to enhanced loss of fast ions and decreased heating efficiencies. Our gyrofluid stability model has recently been extended to include sheared plasma flow velocities. We also discuss recent results from applying this model to ITER, TFTR, and W7-AS.
Date: December 31, 1997
Creator: Spong, D. A.; Carreras, B. A.; Jeboeuf, J-N.; Weller, A.; Nazikian, R. & Zweben, S. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Collisional {delta}f method

Description: A general method for including various collisional effects, such as the drag and diffusion of test particles due to background plasmas, the effect of particle source and sink, and the like-particle Coulomb collisions, is presented. The marker density g is generally unknown along the particle trajectory, and its evaluation depends on the way particles are initially loaded and new particles are injected into the simulation. The method is demonstrated for the problem of the nonlinear evolution of … more
Date: December 31, 1997
Creator: Chen, Y. & White, R. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Theoretical studies of magnetic systems. Final report, August 1, 1994--November 30, 1997

Description: During the grant period the authors have studied five areas of research: (1) low dimensional ferrimagnets; (2) lattice effects in the mixed valence problem; (3) spin compensation in the one dimensional Kondo lattice; (4) the interaction of quasi particles in short coherence length superconductors; and (5) novel effects in angle resolved photoemission spectra from nearly antiferromagnetic materials. Progress in each area is summarized.
Date: December 31, 1997
Creator: Gor`kov, L. P.; Novotny, M. A. & Schrieffer, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Charm decays and high energy photoproduction. Final report, April 1994--May 1997

Description: This project involved continued participation by the Physics Department at the Mayaguez Campus of the University of Puerto Rico (UPR) in high energy physics experiments carried out at Fermilab. The UPR is a member of the E831 collaboration which includes Fermilab and leading US, Italian, Brazilian and Korean universities. E831 is an upgrade to the E687 spectrometer with the goal of a tenfold increase in the statistics for the study of the photoproduction and decay of charmed particles. This spe… more
Date: December 31, 1997
Creator: Lopez, A. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

On the Influence of Dispersoids on the Particle Stimulated Nucleation of Recrystallization in an Al-Fe-Si Model Alloy

Description: The recrystallization of Al-alloys is controlled by precipitates. Whereas large particles generally promote recrystallization by particle stimulated nucleation, finely dispersed precipitates - either already present in the as-deformed state or precipitating during the recrystallization anneal - are known to strongly retard recrystallization. It was the aim of the present study to elucidate these concurring effects of large particles and small dispersoids on recrystallization in a ternary Al-Fe-… more
Date: December 31, 1997
Creator: Engler, O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Mass-8 Experiment -- Measuring the [Beta]-[Alpha] Angular Correlations

Description: The objective of the Mass-8 experiment is to perform a precision test of the conservation of the vector current hypothesis and a search for second class currents. The authors present preliminary data on the correlation coefficients of the {beta}-{alpha} angular correlations of the {beta}-delayed {alpha}-decays of {sup 8}Li and {sup 8}B.
Date: December 31, 1997
Creator: Amsbaugh, J. F.; Beck, M.; de Braeckeleer, L.; Storm, D. W.; Swanson, E.; Swartz, K. B. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Associated {Lambda} production at Jefferson Lab

Description: The {sup 1}H(e, e{prime}K{sup +}){Lambda} and {sup 1}H(e, e{prime}K{sup +}){Sigma}{sup 0} reactions were studied as a function of the squared four-momentum-transfer, Q{sup 2}, and the virtual photon polarization, {var_epsilon}, thus enabling the separation of the longitudinal and transverse parts of the cross section. The existence of a sensibly large longitudinal component for the {sup 1}H(e, e{prime}K{sup +}){Lambda} reaction seems to be sustained by these data.
Date: December 31, 1997
Creator: Niculescu, G.; Baker, O. K.; Avery, S. & Collaboration, E93018
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Heavy quarkonium production and propagation in nuclei

Description: In the search for the quark-gluon plasma, it has been suggested that the production of charmonium will be suppressed in a quark-gluon plasma because of the screening of the interaction between c and {anti c}. To extract information on the suppression due to the quark-gluon plasma, it is necessary to study the suppression of J/{psi} production by sources different from the quark-gluon plasma. It is therefore useful to examine the mechanism of heavy quarkonium production and its propagation in nu… more
Date: December 31, 1997
Creator: Wong, C.Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Energetic neutral atom imaging with the Polar CEPPAD/IPS instrument: Initial forward modeling results

Description: Although the primary function of the CEP-PAD/IPS instrument on Polar is the measurement of energetic ions in-situ, it has also proven to be a very capable Energetic neutral Atom (ENA) imager. Raw ENA images are currently being constructed on a routine basis with a temporal resolution of minutes during both active and quiet times. However, while analyses of these images by themselves provide much information on the spatial distribution and dynamics of the energetic ion population in the ring cur… more
Date: December 31, 1997
Creator: Henderson, M. G.; Reeves, G. D.; Moore, K. R.; Spence, H. E.; Jorgenson, A. M.; Fennell, J. F. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Kinetics and Mechanisms of NO(x) - Char Reduction.

Description: Most industrially important carbons are produced from naturally occurring materials such as coal, oil, peat or wood by some form of thermal process. Chars are obtained from those natural materials as a residue after removal of the volatile matter. Chars (prepared from coal or other organic precursors) are non-graphitizable carbons, meaning that they cannot be transformed into graphitic carbon. Chars are comprised of elementary crystallites in parallel layers which are randomly oriented with res… more
Date: December 31, 1997
Creator: Suurerg, E.M.; Lilly, W.D. & Aarna, I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ultra-high pressure water jet: Baseline report; Greenbook (chapter)

Description: The ultra-high pressure waterjet technology was being evaluated at Florida International University (FIU) as a baseline technology. In conjunction with FIU`s evaluation of efficiency and cost, this report covers the evaluation conducted for safety and health issues. It is a commercially available technology and has been used for various projects at locations throughout the country. The ultra-high pressure waterjet technology acts as a cutting tool for the removal of surface substrates. The Husk… more
Date: July 31, 1997
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen