A method, a terminal, and a system for establishing a Push to Talk Over Cellular group session in a PoC network based on session initiation information, such as information regarding presence of clients to be invited or session start-up time. The exhaust after-treatment system includes a main heat source disposed in the main tank and configured to thaw the reductant. A signal input terminal of each shift register unit is coupled to an output terminal of a rear-stage shift register unit. This process comprises treating a flexible film via corona-discharge, contacting the treated flexible film with the uncured or partially cured back surface of a precoated greige good, and curing the article. Also disclosed is a method for preventing the formation of layers on electrodes used for measuring conductance in a drier. The modified helical pattern results in the distance between the first wire and a reference plane transverse to the longitudinal axis of the base roll sequentially increasing and decreasing at least once when moving in one direction about a circumference of the base roll.