Approximate corrections for Roche limit and sphere of gravitational action;

To describe the attractive range of short distance tour center the indexes that integrating psychological distance and geographical distance are used.

Profit of actions is a very important theoretic issue in civil procedure of continental legal system, and it is the basic core standard to measure imperium civile s utilizing range.

Based on the investigation of its present situation, we pinpoint the current utilization, role and scope of PMP , attitude and expectation of the patients .