In order to analyze the working status of the coal face with fully mechanized top\|coal caving, the concept of the capacity effectiveness was introduced to describe its reliability.

In this paper,the service network for urban public transport is constructed;besides,the concepts of total capacity,total effective capacity,potential capacity and noneffective capacity of the service network for urban public transport are also proposed.

Based on the research of psychology and vessel traffic engineering,this paper names a concept pilot working characteristic distance,Makes an exploration on the time dimension dealed with the relation between efficacy efficiency and mental pressure of pilot,concludes a corresponding relation between continuing time of pilot′s high efficacy efficiency and time of vessel′s encounter process.

The length of contaminated zone was clear, sewage discharge outlets were generalized and the counting length of receiving ability for pollution was computed according to the concentration profile.

Focussing on difficulties in analyzing the reliability of simultaneous systems with multi material flow manufacturing lines and the inaccurate prediction for the material flow,this paper presents concepts of quasi parallel and functional availability.