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What is the electret material? 50 -.The common dielectric polarization occurs under the action of the external electric field. when the electric field is removed, the polarization of the dielectric disappears.The electret is a dielectric with a long-term charge. its charge can be a polarized charge that is 'frozen' due to polarization, or it can be a positive and negative charge that is trapped on the surface or in the body.Similar to the permanent magnet with residual magnetism after the steel rod is magnetized, people also call the dielectric with long-term reserved charge Yongdian, which is used to be called electret.In 1919, the Japanese naval University, Taro Kawaguchi, made the electret for the first time.At that time, the Brazilian palm wax was mixed with the same amount of pine, and some beeswax was added to melt to 130 degrees Celsius, plus the electric field of 15 kV per centimeter. after cooling and solidification, the electric field was removed and the electret was made.This
What is the valve in the middle? This type of structure is generally a Y-type filter,Just a cylindrical shape of the upper end than the general y filter.Close the ball valve on the left,Open the hexagonal nut with a wrench and look at it,If there is a metal screen filter inside,Is the y filter.The filter screen should be cleaned regularly.
Sewage purification treatment The so-called sewage purification treatment,The effluent quality of the treated sewage is very good,Its indicators should at least meet the above requirements for reuse,It is called sewage purification treatment.The traditional sewage treatment process is adopted,After the sewage is treated,To achieve the effect of purification treatment,The treatment process generally adopts a treatment process of three or more levels.The first-stage process is pretreatment,The second level is biochemical treatment,The third level is deep processing,Only in this way,In order to completely remove the pollutants in the sewage,The quality of the effluent reaches the level of purification.There are many pretreatment processes,Generally, depending on the water quality,The most commonly used methods are horizontal sand sink, vertical flow sand sink, Cyclone sand sink, aeration sand sink, horizontal flow sedimentation tank, vertical flow sedimentation tank, radial flow sed
