A method forms polar diagrams in a connection between a subscriber and a base station with an antenna arrangement in a radio communications system using multiple access methods. Each reactor is equipped with a recirculation system including a pump arranged to circulate a reaction mixture through the tube side of the reactor independently of the introduction of olefin polymerization reaction mixture into the reactor. The ring is expansible from a radially compact disposition with a relatively small circumference to a radially expanded disposition with a relatively large circumference. In an SRAM cell including at least a negative differential resistance device as a pull-up element, this type of latch control can be achieved through appropriate biasing of the NDR device. The holders are rotatably mounted on the top wall and each hold a corresponding substrate to first receive the working material and then to be submerged into the dye material through one of the through holes of the dye container by rotation, thereby obtaining the electrode of a dye-sensitized solar cell.