A connection including a first closure component including a first adapter and a fitting element which is able to move relative to the first adapter and an elastic or resilient element which couples the first adapter to the fitting element andor is disposed between them. An amount of delay between the first and second clock signals is determined by a control voltage potential. Compressing the item inside the package removes trapped air thereby reducing the size of the item andor package. If, after the sweeping, it is determined that the queue can handle additional messages, then one or more messages are placed back on the queue. Injection and curing of resin for insulation, which have been carried out for a conventional structure, are not necessary, so that the electric compressor has high assembling efficiency and whose sealed terminal can be reused. These structures perform a variety of nonlinear optical functions including all-optical switching and passive optical limiting.