Indicators of Reconnection Processes and Transition to Global Chaos in Nontwist Maps

Reconnection processes of twin-chains are systematically studied in the quadratic twist map. By using the reversibility and symmetry of the mapping, the location of the indicator points is theoretically determined in the phase space. The indicator points enable us to obtain useful information about the reconnection processes and the transition to global chaos. We succeed in deriving the general conditions for the reconnection thresholds. In addition, a new type of reconnection process which generates shearless curves is studied.Comment: 10 pages, 10 GIF figures, to appear in Prog. Theor. Phys. 100 (1998

On dissemination mechanism of corporate social responsibility (CSR): Analysis with agent simulation

Corporate Social Responsibility (CSR), such as pro-environmental behaviour and fair trade, is a kind of normative behaviour by private companies to provide a quasi-public good. We study dissemination mechanism of CSR with a multi-agent model in which corporation agents and consumer agents interact with each other. We show that the mechanism to disseminate CSR is a positive feedback between the corporations\u27 popularity seeking behaviour and the consumers\u27 social learning in which CSR-seeking preference is evaluated according to both the local average of the preferences of surrounding consumers and the global average of the investment in CSR by all corporations. We also discuss an institutional design to establish CSR from an objectionable social state

Light emission patterns from stadium-shaped semiconductor microcavity lasers

We study light emission patterns from stadium-shaped semiconductor (GaAs) microcavity lasers theoretically and experimentally. Performing systematic wave calculations for passive cavity modes, we demonstrate that the averaging by low-loss modes, such as those realized in multi-mode lasing, generates an emission pattern in good agreement with the ray model's prediction. In addition, we show that the dependence of experimental far-field emission patterns on the aspect ratio of the stadium cavity is well reproduced by the ray model.Comment: 5 pages, 4 figure