Abstract: Disclosed by the present disclosure are a method and apparatus for producing fine rubber powder from waste tires, which belong to the field of rubber powder production. To solve the problem of high iron impurity content in rubber powder after existing mechanical pulverization, the method for producing fine rubber powder from waste tires sequentially includes: Step 1: separating a waste tire between a sidewall and a shoulder to obtain a tire annular band; and Step 2: applying a water jet to the tire annular band by a crushing water jet cutter to cut it into a flocculent rubber structure; and grinding the flocculent rubber structure on the surface of the tire annular band by a grinding assembly into fine rubber powder.

Abstract: A communication system is provided for transmitting a RF signal, which has a frequency band. The communication system comprises: a sigma delta modulator for modulating the RF signal into a broadband signal wherein the signal to noise ratio of the broadband signal is higher in the frequency band of the RF signal than outside the frequency band of the RF signal; an optical transmitter connected with the sigma delta modulator and with an optical fiber for transmitting the broadband signal over the optical fiber; a photo-detector configured for receiving the broadband signal from the optical fiber and converting it into an electrical signal; an output device and a matching circuit configured for power matching and/or noise matching of the photo-detector, at the frequency band of the RF signal, with the output device.

Abstract: A communication system is provided for transmitting a RF signal, which has a frequency band. The communication system comprises: a sigma delta modulator for modulating the RF signal into a broadband signal wherein the signal to noise ratio of the broadband signal is higher in the frequency band of the RF signal than outside the frequency band of the RF signal; an optical transmitter connected with the sigma delta modulator and with an optical fiber for transmitting the broadband signal over the optical fiber; a photo-detector configured for receiving the broadband signal from the optical fiber and converting it into an electrical signal; an output device and a matching circuit configured for power matching and/or noise matching of the photo-detector, at the frequency band of the RF signal, with the output device.