Abstract: An antenna system includes a first antenna and a second antenna. The first antenna includes a first radiating element, a first frequency selective surface, and a first feed network. The first radiating element is disposed on a side of the first frequency selective surface, and the second antenna is disposed on a side that is of the first frequency selective surface and that is away from the first radiating element. The first frequency selective surface includes a plurality of first strip-shaped structures and a plurality of second strip-shaped structures. The first strip-shaped structures and the second strip-shaped structures are made of metal. The plurality of first strip-shaped structures intersect with the plurality of second strip-shaped structures to form a plurality of grids. The first feed network includes a first structure, and the first structure is disposed on the first strip-shaped structure.

Abstract: The present disclosure relates to an efficient biodegradable dust suppressant for an open-pit mine and a preparation method therefor. The dust suppressant includes the following components in percentage by weight: 2%-3.5% of gallic acid, 1.5%-2% of sodium alginate, 0.25%-2% of a surfactant, 0.5%-1% of an antifreeze liquid, and balance water. The preparation method includes the following steps: (1) preparing the gallic acid; (2) preparing the antifreeze liquid; (3) weighing the components in parts by weight; (4) mixing the gallic acid, water, sodium alginate and antifreeze liquid; (5) adding the surfactant; and (6) adding the balance water to prepare the efficient biodegradable dust suppressant for an open-pit mine. The present disclosure has the characteristics of low temperature resistance, high temperature resistance, bonding, wetting, coal dust consolidation and the like, is biodegradable, and does not cause secondary pollution.

Abstract: The present disclosure relates to an efficient biodegradable dust suppressant for an open-pit mine and a preparation method therefor. The dust suppressant includes the following components in percentage by weight: 2%-3.5% of gallic acid, 1.5%-2% of sodium alginate, 0.25%-2% of a surfactant, 0.5%-1% of an antifreeze liquid, and balance water. The preparation method includes the following steps: (1) preparing the gallic acid; (2) preparing the antifreeze liquid; (3) weighing the components in parts by weight; (4) mixing the gallic acid, water, sodium alginate and antifreeze liquid; (5) adding the surfactant; and (6) adding the balance water to prepare the efficient biodegradable dust suppressant for an open-pit mine. The present disclosure has the characteristics of low temperature resistance, high temperature resistance, bonding, wetting, coal dust consolidation and the like, is biodegradable, and does not cause secondary pollution.

Abstract: A composite fertilizer containing magnesium ammonium phosphate and polyglutamic acid. A weight ratio of the polyglutamic acid to the magnesium ammonium phosphate is 1:100 to 10000, preferably 1:200 to 8000. An experimental result indicates that the composite fertilizer can well regulate the growth of crops, improve the disease resistance and stress tolerance, promote the healthy effect of the crops, and increase the yield of the crops.

Abstract: The present invention discloses a plant growth regulator. The effective ingredients of the plant growth regulator comprise active components A and B, wherein the active component A is thidiazuron, and the active component B is amino-oligosaccharin. Also provided are a preparation method and use of the composition. Experimental results indicate that the composition of the present invention is effective in regulating the growth, increasing the disease and stress resistance, promoting the health and increasing the yield and quality of crops.

Abstract: Provided is a keyword verification method including: acquiring keywords corresponding to the content of a verification object, such as a video, an audio and a picture, displayed and broadcast by a client; and using an identifier to mark the content, generating a verification prompt according to the keyword or the identifier, and further determining a verification result according to a feedback of a user of a corresponding client. Further disclosed is a generation device for implementing the verification method.

Abstract: The present invention discloses a plant growth regulator. The effective ingredients of the plant growth regulator comprise active components A and B, wherein the active component A is thidiazuron, and the active component B is amino-oligosaccharin. Also provided are a preparation method and use of the composition. Experimental results indicate that the composition of the present invention is effective in regulating the growth, increasing the disease and stress resistance, promoting the health and increasing the yield and quality of crops.

Abstract: Provided is a keyword verification method including: acquiring keywords corresponding to the content of a verification object, such as a video, an audio and a picture, displayed and broadcast by a client; and using an identifier to mark the content, generating a verification prompt according to the keyword or the identifier, and further determining a verification result according to a feedback of a user of a corresponding client. Further disclosed is a generation device for implementing the verification method.