Abstract: The disclosure relates to a method for manufacturing a tray table containing plant fiber and a tray table made therefrom. The manufacturing method comprises: a) homogenizing a halogen-free flame retardant to obtain a homogeneous halogen-free flame retardant; b) melting a thermoplastic resin and uniformly blending the molten thermoplastic resin with a plant fiber, the homogeneous halogen-free flame retardant, and a compatibilizer to obtain a plant fiber composite material; c) extruding and granulating the plant fiber composite material to obtain a granular composite material; and d) mixing the granular composite material with a foaming agent and injection molding to obtain the tray table. The tray table manufactured according to the method herein is green and environmentally friendly, non-toxic and harmless, and also has high flame-retardant effect and weight reduction effect.

Abstract: A system and method for encoding and decoding a frequency-shift keyed data signal for transmission over a non-ideal communications channel that utilizes phase-coherently combined halfwave segments of sinewaves with a finite number of different frequencies and equal amplitudes. A stream of data characters is encoded into a transmit sequence {S(n)} of positive numbers which defines an ac signal of halfwave segments of sinewaves of fixed, preselected amplitude. The ac signal encoding the stream of data characters is transmitted over the communications channel and received as a perturbed ac signal. The received signal is identified by consecutively determining the time durations between peak values or between zero crossings of each segment yielding a receive sequence {E(n)} of positive numbers. All or parts of this receive sequence are then compared with each of a set of preselected, stored sequences, each representing a stream of none, one or more data characters.