7,009 research outputs found
Twisted vertex operators and unitary Lie algebras
A representation of the central extension of the unitary Lie algebra
coordinated with a skew Laurent polynomial ring is constructed using vertex
operators over an integral Z_2-lattice. The irreducible decomposition of the
representation is explicitly computed and described. As a by-product, some
fundamental representations of affine Kac-Moody Lie algebra of type
are recovered by the new method.Comment: 26 page
Can preservice physical educators’ implicit attitude toward students with disabilities be changed by adapted physical education training program? Based on an Implicit Association Test
Purpose: Aim to explore whether preservice physical educators’ implicit attitude toward students with disabilities could be improved by a mid-term adapted physical education training program.
Design: A randomized and controlled trial was deployed in the current experiment. Subjects were randomly divided into two groups (Experimental group and control group) after the pre-test of IAT. Post-test IAT was conducted for two groups after the training program for the experimental group.
Findings: Chinese preservice physical educators’ implicit attitudes toward students with disabilities were negative. They also had a prejudice against students with disabilities. But the implicit attitudes toward students with disabilities could be improved by mid-term adapted physical education training. Furthermore, gender and contact experience with disabilities had no significant influence on the change in their implicit attitude
Determining the luminosity function of Swift long gamma-ray bursts with pseudo-redshifts
The determination of luminosity function (LF) of gamma-ray bursts (GRBs) is
of an important role for the cosmological applications of the GRBs, which is
however hindered seriously by some selection effects due to redshift
measurements. In order to avoid these selection effects, we suggest to
calculate pseudo-redshifts for Swift GRBs according to the empirical L-E_p
relationship. Here, such a relationship is determined by reconciling
the distributions of pseudo- and real redshifts of redshift-known GRBs. The
values of E_p taken from Butler's GRB catalog are estimated with Bayesian
statistics rather than observed. Using the GRB sample with pseudo-redshifts of
a relatively large number, we fit the redshift-resolved luminosity
distributions of the GRBs with a broken-power-law LF. The fitting results
suggest that the LF could evolve with redshift by a redshift-dependent break
luminosity, e.g., L_b=1.2\times10^{51}(1+z)^2\rm erg s^{-1}. The low- and
high-luminosity indices are constrained to 0.8 and 2.0, respectively. It is
found that the proportional coefficient between GRB event rate and star
formation rate should correspondingly decrease with increasing redshifts.Comment: 5 pages, 5 figures, accepted for publication in ApJ
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