30,747 research outputs found
Corrections to Finite Size Scaling in Percolation
A 1/L-expansion for percolation problems is proposed, where L is the lattice
finite length. The square lattice with 27 different sizes L = 18, 22 ... 1594
is considered. Certain spanning probabilities were determined by Monte Carlo
simulations, as continuous functions of the site occupation probability p. We
estimate the critical threshold pc by applying the quoted expansion to these
data. Also, the universal spanning probability at pc for an annulus with aspect
ratio r=1/2 is estimated as C = 0.876657(45)
Line-strength indices and velocity dispersions for 148 early-type galaxies in different environments
We have derived high quality line-strength indices and velocity
dispersions for a sample of 148 early-type galaxies in different
environments. The wavelength region covered by the observations
( to 6600 Å) includes the Lick/IDS indices
H, Mg1, Mg2, Mgb, Fe5015, Fe5270, Fe5335, Fe5406,
Fe5709, Fe5782, NaD, TiO1 and TiO2. The data are intended to
address possible differences of the stellar populations of early-type
galaxies in low- and high-density environments. This paper describes
the sample properties, explains the data reduction and presents the
complete list of all the measurements. Most galaxies of the sample
(85%) had no previous measurements of any Lick/IDS indices and for
30% of the galaxies we present first-time determinations of their
velocity dispersions. Special care is taken to identify galaxies with
emission lines. We found that 62 per cent of the galaxies in the
sample have emission lines, as measured by the equivalent width of the
[OIII] 5007Å line, EW[OIII] > 0.3 Å
FINITE SIZE SCALING FOR FIRST ORDER TRANSITIONS: POTTS MODEL
The finite-size scaling algorithm based on bulk and surface renormalization
of de Oliveira (1992) is tested on q-state Potts models in dimensions D = 2 and
3. Our Monte Carlo data clearly distinguish between first- and second-order
phase transitions. Continuous-q analytic calculations performed for small
lattices show a clear tendency of the magnetic exponent Y = D - beta/nu to
reach a plateau for increasing values of q, which is consistent with the
first-order transition value Y = D. Monte Carlo data confirm this trend.Comment: 5 pages, plain tex, 5 EPS figures, in file POTTS.UU (uufiles
Geometric classical and total correlations via trace distance
We introduce the concepts of geometric classical and total correlations
through Schatten 1-norm (trace norm), which is the only Schatten p-norm able to
ensure a well-defined geometric measure of correlations. In particular, we
derive the analytical expressions for the case of two-qubit Bell-diagonal
states, discussing the superadditivity of geometric correlations. As an
illustration, we compare our results with the entropic correlations, discussing
both their hierarchy and monotonicity properties. Moreover, we apply the
geometric correlations to investigate the ground state of spin chains in the
thermodynamic limit. In contrast to the entropic quantifiers, we show that the
classical correlation is the only source of 1-norm geometric correlation that
is able to signaling an infinite-order quantum phase transition.Comment: v2: published versio
Speeding Up Computer Simulations: The Transition Observable Method
A method is presented which allows for a tremendous speed-up of computer
simulations of statistical systems by orders of magnitude. This speed-up is
achieved by means of a new observable, while the algorithm of the simulation
remains unchanged.Comment: 20 pages, 6 figures Submitted to Phys.Rev.E (August 1999) Replacement
due to some minor change
Perspectives on the cross-cultural challenges and coping strategies of sport coaches
As competitive sports become increasingly global, sport coaches engage in multicultural organizations and interact with people from different cultures. These interactions may need sport coaches to have cross-cultural competencies to manage cultural differences. The purpose of this study was to investigate the cross-cultural challenges encountered by sport coaches in multicultural sport environments, and to explore the coping strategies they employ to navigate these challenges. Semi-structured interviews were conducted with twelve coach educators from various sports and nations. Reflexive thematic analysis revealed two themes regarding the cross-cultural challenges faced by sport coaches: (1) unpreparedness to interact with people of different cultures, and (2) adapting to different cultures as a sports coach. In addition, two themes emerged in relation to their coping strategies: (3) being immersed in different cultures; and (4) being open-minded. The results of the study indicate that sport coaches, regardless of whether they are in their home country or abroad, encounter personal and professional challenges related to culture in their interactions with others. It illustrates the need for cross-cultural topics to be addressed in coach development programs
- …