First, mushroom root soup. The mushroom feet cut from the mushrooms are boiled for 5 minutes, and after clarification, 10 times of water is sprayed to promote the growth of the young mushrooms. A band-pass filter or bandpass filter (BPF) is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range. Bandpass Filters,Optical Filters,Bandpass Optical Filter,Optical Bandpass Filter Changchun Realpoo Photoelectric Co., Ltd. , https://www.optics-realpoo.com
Bandpass filters are widely used in wireless transmitters and receivers. The main function of such a filter in a transmitter is to limit the bandwidth of the output signal to the band allocated for the transmission. This prevents the transmitter from interfering with other stations. In a receiver, a bandpass filter allows signals within a selected range of frequencies to be heard or decoded, while preventing signals at unwanted frequencies from getting through. Signals at frequencies outside the band which the receiver is tuned at, can either saturate or damage the receiver. Additionally they can create unwanted mixing products that fall in band and interfere with the signal of interest. Wideband receivers are particularly susceptible to such interference.[3] A bandpass filter also optimizes the signal-to-noise ratio and sensitivity of a receiver.
In both transmitting and receiving applications, well-designed bandpass filters, having the optimum bandwidth for the mode and speed of communication being used, maximize the number of signal transmitters that can exist in a system, while minimizing the interference or competition among signals.
Outside of electronics and signal processing, one example of the use of band-pass filters is in the atmospheric sciences. It is common to band-pass filter recent meteorological data with a period range of, for example, 3 to 10 days, so that only cyclones remain as fluctuations in the data fields.
Second, the culture material leaching solution. The dried fermented culture material is boiled in water and filtered, and 10 times of water and 10% calcium carbonate are sprayed to prolong the time of mushroom bed.
Third, human urine fermentation broth. Fresh human urine is naturally fermented and boiled until the foam disappears. Add 10 times of water to spray, then spray it with water.
Fourth, the mushroom increased production. Each package of stimulation is dissolved in 25 liters of water, and can spray 50 square meters of bacteria bed, but it should be noted that the stimulation of the production of the solution accounted for 1/5 of the total amount of water sprayed.
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