A suspension and method applies the unsprung weight of the wheels and axles to reduce the motion of the sprung weight of chassis. The microfluidic device comprises an input channel, focusing channel and an assaying channel. A second step involves preloading the deformable shims beyond their yield point in situ until a predetermined preload tolerance is reached. When the backrest slides upward, the engaging element successively engages with one of the positioning teeth so as to position the backrest at a desired height. A current adjusting circuit is configured to adjust an alternating current outputted to a lamp set in response to an environment temperature to supply an adequate alternating current at a low temperature for starting the lamp set. The present invention also offers significantly improved performance over currently available land-based systems, as high bit rate data connectivity is made possible over long distances by utilizing multiple frequencies, antennas, polarizations, modulations, and radios to optimize propagation and accomplish the delivery of synchronous and asynchronous data connections to a seagoing vessel.