6,553 research outputs found
On the premelting features in sodium clusters
Melting in Na_n clusters described with an empirical embedded-atom potential
has been reexamined in the size range 55<=n<=147 with a special attention at
sizes close to 130. Contrary to previous findings, premelting effects are also
present at such medium sizes, and they turn out to be even stronger than the
melting process itself for Na_133 or Na_135. These results indicate that the
empirical potential is_qualitatively_ unadequate to model sodium clusters.Comment: 4 pages, 3 postscript figure
Do Economists Lie More?
Recent experimental evidence suggests that some people dislike telling
lies, and tell the truth even at a cost. We use experiments as well to study the
socio-demographic covariates of such lie aversion, and find gender and religiosity
to be without predictive value. However, subjects’ major is predictive: Business
and Economics (B&E) subjects lie significantly more frequently than other
majors. This is true even after controlling for subjects’ beliefs about the overall
rate of deception, which predict behavior very well: Although B&E subjects
expect most others to lie in our decision problem, the effect of major remains. An
instrumental variables analysis suggests that the effect is not simply one of
selection: It seems that studying B&E has a causal impact on behavio
Melting of the Au20 gold cluster : does charge matter?
We investigate the dependence upon charge of the heat capacities of the magic
gold cluster Au20 obtained from density functional based tight binding theory
within parallel tempering molecular dynamics and the multiple histogram method.
The melting temperatures, determined from heat capacity curves, are found to be
1102 K for neutral Au20 and only 866 and 826 K for Au{20} cations and anions
respectively. The present work proves that a single charge quantitatively
affects the thermal properties of the twentymer even for a global property such
as melting
Do Economists Lie More?
Recent experimental evidence suggests that some people dislike telling lies, and tell the truth even at a cost. We use experiments as well to study the socio-demographic covariates of such lie aversion, and find gender and religiosity to be without predictive value. However, subjects’ major is predictive: Business and Economics (B&E) subjects lie significantly more frequently than other majors. This is true even after controlling for subjects’ beliefs about the overall rate of deception, which predict behavior very well: Although B&E subjects expect most others to lie in our decision problem, the effect of major remains. An instrumental variables analysis suggests that the effect is not simply one of selection: It seems that studying B&E has a causal impact on behavior.Communication; honesty; lie aversion; major; norms.
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