5 research outputs found
Melting as a String-Mediated Phase Transition
We present a theory of the melting of elemental solids as a
dislocation-mediated phase transition. We model dislocations near melt as
non-interacting closed strings on a lattice. In this framework we derive simple
expressions for the melting temperature and latent heat of fusion that depend
on the dislocation density at melt. We use experimental data for more than half
the elements in the Periodic Table to determine the dislocation density from
both relations. Melting temperatures yield a dislocation density of (0.61\pm
0.20) b^{-2}, in good agreement with the density obtained from latent heats,
(0.66\pm 0.11) b^{-2}, where b is the length of the smallest
perfect-dislocation Burgers vector. Melting corresponds to the situation where,
on average, half of the atoms are within a dislocation core.Comment: 18 pages, LaTeX, 3 eps figures, to appear in Phys. Rev.
Building a climate of trust during organizational change: The mediating role of justice perceptions and emotion
Over the years, research has shown that, although there are various factors which contribute to failed change, one of the key reasons people resist change is due to the inability of leaders to convince employees to support change and to commit the energy and effort necessary to implement it. Senior management can ensure an organization is change-ready by developing and maintaining a supportive culture and climate that positively influence the emotional health and welfare of employees. Despite the obvious importance of leadership to change efforts, little previous research has investigated, holistically and in the context of major change, the relationship between senior management actions and employee responses. Furthermore, the change literature largely ignores the role that emotions play in employee responses to change initiatives. This chapter addresses both areas, and develops a model of organizational change from a justice and emotions perspective, which depicts employees’ justice perceptions related to senior executives as affecting trust directly and indirectly, through associated emotional responses