14,796 research outputs found
Observation of the antimatter helium-4 nucleus at RHIC
We present the observation of the \Heebar nucleus, the heaviest antinucleus
observed to date. In total, 18 \Heebar counts were detected at the STAR
experiment at RHIC in 10 recorded Au+Au collisions at beam energies of
= 200 GeV and 62 GeV. The background has been estimated, and
the misidentification probability is found to be lower than 10.Comment: 4 pages, 3 figures, to appear as proceedings of QM2011 conference at
Annecy, Franc
Critical magnetic field in holographic superconductor in Gauss-Bonnet gravity with Born-Infeld electrodynamics
In the paper using matching method in the probe limit, we investigate some
properties of holographic superconductor in Gauss-Bonnet gravity with
Born-Infeld electrodynamics . We discuss the effects of the Gauss-Bonnet
coupling \a and Born-Infeld parameter on the critical temperature and
condensate. We find that both of \a and make the critical temperature
decrease, which implies the condensate harder to form.
Moreover we study the magnetic effect on holographic superconductor and
obtain that the ratio between the critical magnetic field and the square of the
critical temperature increases from zero as the temperature is lowered below
the critical value , which agrees well with the former results. We also
find the critical magnetic field is indeed affected by Gauss-Bonnet coupling,
but not by Born-Infeld parameter.Comment: 13 pages, 5 figure
A range extension for Haplomitrium mnioides (Lindb.) R.M.Schust.
Haplomitrium mnioides (Lindb.) R.M.Schust. is reported as new to Hainan Island. A continuous distribution of H. mnioides from west (Thailand) to east (Japan) is confirmed. Habitat pictures and a distribution map are provided
Discovery of Novel Triplex DNA Binding Ligands
Triplex DNA formation has attracted interest in anti-gene therapy as it can interfere with many pathogenic activities, including replication halt and gene expression regulation. Triplex DNA is not as stable as duplex DNA under physiological conditions. Small molecules, known as anti-gene enhancers, have been used to facilitate the formation of triplex DNA. In the present work, I report the discovery of a novel class of small molecules that can bind to triplex DNA with high affinities but do not influence the structures of duplex DNA
Estimation and model selection in generalized additive partial linear models for correlated data with diverging number of covariates
We propose generalized additive partial linear models for complex data which
allow one to capture nonlinear patterns of some covariates, in the presence of
linear components. The proposed method improves estimation efficiency and
increases statistical power for correlated data through incorporating the
correlation information. A unique feature of the proposed method is its
capability of handling model selection in cases where it is difficult to
specify the likelihood function. We derive the quadratic inference
function-based estimators for the linear coefficients and the nonparametric
functions when the dimension of covariates diverges, and establish asymptotic
normality for the linear coefficient estimators and the rates of convergence
for the nonparametric functions estimators for both finite and high-dimensional
cases. The proposed method and theoretical development are quite challenging
since the numbers of linear covariates and nonlinear components both increase
as the sample size increases. We also propose a doubly penalized procedure for
variable selection which can simultaneously identify nonzero linear and
nonparametric components, and which has an asymptotic oracle property.
Extensive Monte Carlo studies have been conducted and show that the proposed
procedure works effectively even with moderate sample sizes. A pharmacokinetics
study on renal cancer data is illustrated using the proposed method.Comment: Published in at http://dx.doi.org/10.1214/13-AOS1194 the Annals of
Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical
Statistics (http://www.imstat.org
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