A method of determining a collision between two or more transmitting stations at one of the transmitting stations on a frame-based communications network. Each source driver has M driving channels, and a first subset of the driving channels and a second subset of the driving channels are respectively in a first mode and a second mode according to a preset mode sequence, wherein M\u2267N. In the administration reservoir the at least one solvent is separated from the administration reservoir by a solvent recovery means such that the active substance achieves a certain level on an interface device which is permeable for the one active substance. An elongated pin having a first end and a second end is fixedly attached to the first hub at the first end of the pin. There can be provided a method of producing a single-polarized lithium-tantalate crystal in a short time efficiently wherein the surface charge generated due to a pyroelectric property can be decayed quickly by improving the electric conductivity and a single-polarized lithium-tantalate crystal.