Abstract: The present invention relates to the field of garbage landfill. The present invention discloses a classified landfill device and method for garbage landfills, and the problem solved by the present invention is that the device proposed in the above background absorbs metals in the garbage using a magnet, but when the surface of the magnet has absorbed a large amount of metal, the device needs to be closed to treat the metal adsorbed on the surface of the magnet. The present invention comprises a screening mechanism, crushing mechanism and discharge mechanism. According to the classified landfill device and method for garbage landfill, the second crushing knife is set at an angle to divert the falling garbage to the front and rear sides, so that the two first crushing knives and the second crushing knife cooperate to crush the garbage respectively to avoid excessive accumulation of garbage.

Abstract: A method of fabrication of Ni electrodes by hydrogen bubbles dynamic templated electrodeposition of Ni on a substrate, the method comprising one of: i) selecting a current, and selecting an electrodeposition time at the selected current according to a deposit target thickness on the substrate; and ii) selecting an electrodeposition time, and selecting a current during the selected electrodeposition time according to the deposit target thickness on the substrate. The dynamic hydrogen bubble templated Ni films comprises micrometer-sized pores at a surface thereof, and pore walls having a cauliflower-like secondary structure.

Abstract: Provided is an ? amylase variant obtained by the mutation or deletion of at least one amino acid residue in the amino acid sequence of a parent ? amylase, and at the same time, same is an ? amylase maintaining the capability of the parent to hydrolyse ?-1,4 glycosidic bond, wherein the amino acid sequence homology of the two reaches 95% or more. A series of ? amylase variants provided therein have a relatively high catalytic activity under acidic conditions of pH 5.0 and high temperatures of at least 100° C.

Abstract: Provided is an ? amylase variant obtained by the mutation or deletion of at least one amino acid residue in the amino acid sequence of a parent ? amylase, and at the same time, same is an ? amylase maintaining the capability of the parent to hydrolyse ?-1,4 glycosidic bond, wherein the amino acid sequence homology of the two reaches 95% or more. A series of ? amylase variants provided therein have a relatively high catalytic activity under acidic conditions of pH 5.0 and high temperatures of at least 100° C.