A structure for a delay cell in a Voltage-Controlled Oscillators and method for operating the delay cell. Hook component are disposed on the ends of each housing for attaching a piece of luggage. The disclosure also describes the processes for synthesizing the novel tracers, and the application of these tracers in fluorescence immunoassays for detecting and quantifying cannabinoids in biological samples. The first scan line is located between the first and second pixel electrode. The water-permeable bag further contains an ion exchange resin therein. NH4OH is fed into said coaxial feed pipe and is then mixed with said cooled seawater and released via a series of nozzles in several vertical levels from said feed pipe to said process unit’s upwards flowing, rotating exhaust.