Gravitational collapse without a remnant

We investigate the gravitational collapse of a spherically symmetric, inhomogeneous star, which is described by a perfect fluid with heat flow and satisfies the equation of state $p=\rho/3$ or p=C\rho^\ga at its center. Different from the ordinary process of gravitational collapsing, the energy of the whole star is emitted into space. And the remaining spacetime is a Minkowski one at the end of the process.Comment: 9 pages, 9 figures, to appear in Int. J. Theor. Phy

From Men and Machines to the Organizational Learning Curve

Organizational learning can be understood as the arousal of recurring patterns of interaction between the members of an organization. Thus, the slope of the learning curve ultimately depends on the structure of information flows between organizational units. In particular, in a production plant organizational learning corresponds to improving the routing and sequencing of semi-manufactured goods between units. This contribution explores the impact of routing problems and sequencing problems on the organizational learning curve by means of numerical simulations and a stylized mathematical model