1,301,609 research outputs found
Exile Vol. XIX No. 2
POETRY
speckled day by Richard Carothers 3
Looking-Glass by Doug Cox 3
February fog scooves in by H. 8
Surface Tension by Glenn Bard 9
Closing by Doug Cox 10
southwest bazaar by Val Evans 16
Haiku sequence By Suzanne B. Dean 17
summertime by Richard Carothers 18
The Desirability of Being a Line by Laurie Wharton 18
The Blatant Morning by Phil Mercurio 23
sweet nothings by Linda Anderson 23
Alone In Bed by Val Evans 24
Walls and the Fallen Woman by H. 26-27
A Victim of Need by Suzanne B. Dean 28
PHOTOGRAPHY
by Tamera Iverson 1, 18
by John Bildahl 9, 15
by Anne G. English 25
by Richard E. Bergen 27
by Bruce Andre 28
ARTWORK
The Road to Calvary by Sheila Rollit 4
Norwegian Sadness by Tamera Iverson 11
by Ann Merrill 16
by Jude Hasel 17
by Pat Victory 22
by Wilson R. Baldridge 26
FICTION
To My Grandmother by Robb Knuepfer 5-8
First Monday in July by Joe L. Bolster III 12-14
Glad About A Lot Today by John Fergus 19-22
A city stands by Suzanne B. Dean 24-2
Dielectronic Recombination in Photoionized Gas. II. Laboratory Measurements for Fe XVIII and Fe XIX
In photoionized gases with cosmic abundances, dielectronic recombination (DR)
proceeds primarily via nlj --> nl'j' core excitations (Dn=0 DR). We have
measured the resonance strengths and energies for Fe XVIII to Fe XVII and Fe
XIX to Fe XVIII Dn=0 DR. Using our measurements, we have calculated the Fe
XVIII and Fe XIX Dn=0 DR DR rate coefficients. Significant discrepancies exist
between our inferred rates and those of published calculations. These
calculations overestimate the DR rates by factors of ~2 or underestimate it by
factors of ~2 to orders of magnitude, but none are in good agreement with our
results. Almost all published DR rates for modeling cosmic plasmas are computed
using the same theoretical techniques as the above-mentioned calculations.
Hence, our measurements call into question all theoretical Dn=0 DR rates used
for ionization balance calculations of cosmic plasmas. At temperatures where
the Fe XVIII and Fe XIX fractional abundances are predicted to peak in
photoionized gases of cosmic abundances, the theoretical rates underestimate
the Fe XVIII DR rate by a factor of ~2 and overestimate the Fe XIX DR rate by a
factor of ~1.6. We have carried out new multiconfiguration Dirac-Fock and
multiconfiguration Breit-Pauli calculations which agree with our measured
resonance strengths and rate coefficients to within typically better than
<~30%. We provide a fit to our inferred rate coefficients for use in plasma
modeling. Using our DR measurements, we infer a factor of ~2 error in the Fe XX
through Fe XXIV Dn=0 DR rates. We investigate the effects of this estimated
error for the well-known thermal instability of photoionized gas. We find that
errors in these rates cannot remove the instability, but they do dramatically
affect the range in parameter space over which it forms.Comment: To appear in ApJS, 44 pages with 13 figures, AASTeX with postsript
figure
Arguments towards the construction of a matrix model groundstate
We discuss the existence and uniqueness of wavefunctions for inhomogenoeus
boundary value problems associated to x^2y^2-type matrix model on a bounded
domain of R^2. Both properties involve a combination of the Cauchy-Kovalewski
Theorem and a explicit calculations.Comment: 3 pages, Latex Proceedings for the XIX Simposio Chileno de Fisica,
SOCHIFI 2014 Conference, 26-28 November 2014, held at Concepcion U., Chil
Global analysis of helicity PDFs: past - present - future
We discuss the current status of the DSSV global analysis of
helicity-dependent parton densities. A comparison with recent semi-inclusive
DIS data from COMPASS is presented, and constraints on the polarized
strangeness density are examined in some detail.Comment: Talk presented at the XIX Int. Workshop on Deep-Inelastic Scattering
and Related Subjects (DIS 2011); 4 pages; 2 figure
On Galois-Division Multiple Access Systems: Figures of Merit and Performance Evaluation
A new approach to multiple access based on finite field transforms is
investigated. These schemes, termed Galois-Division Multiple Access (GDMA),
offer compact bandwidth requirements. A new digital transform, the Finite Field
Hartley Transform (FFHT) requires to deal with fields of characteristic p, p
\neq 2. A binary-to-p-ary (p \neq 2) mapping based on the opportunistic
secondary channel is introduced. This allows the use of GDMA in conjunction
with available digital systems. The performance of GDMA is also evaluated.Comment: 6 pages, 4 figures. In: XIX Simposio Brasileiro de Telecomunicacoes,
2001, Fortaleza, CE, Brazi
Towards the lattice study of M-theory (II)
We present new results of the quenched simulations of the reduced D=4
supersymmetric Yang - Mills quantum mechanics for larger gauge groups SU(N),
2<N<9. The model, studied at finite temperature, reveals existence of the two
distinct regions which may be precursors of a black hole and the elementary D0
branes phases of M-theory conjectured in the literature. Present results for
higher groups confirm the picture found already for N=2. Similar behaviour is
observed in the preliminary simulations for the D=6 and D=10 models.Comment: Talk presented at XIX International Symposium on Lattice Field Theory
lattice2001(surfaces
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