Abstract: The present disclosure provides a blockchain-based green power certification method, apparatus, and system, to pre-process obtained basic data to obtain proof-of-existence data, certify the proof-of-existence data from a production side and a consumption side by using a certification chain and a token chain respectively, and obtain a green power attribute certificate and a green power consumption label if the certification is passed; generate a unique digital identifier for the green power attribute certificate and the green power consumption label separately based on a non-fungible token (NFT), which realizes non-interchangeability, indivisibility, and other characteristics of the certificate and the identifier; and supervise and verify a certification process by using a chain of custody, and generate a corresponding unique blockchain identifier for the certification chain, the token chain, and the chain of custody separately through multi-chain interaction, so as to realize data interaction between blockcha

Abstract: The invention relates to a block bidding method and system for promoting clean energy consumption based on the power trading platform. The block bidding method includes the following steps: dividing the time slots for clean energy units to participate in power trading; predicting the typical monthly power generation curve of clean energy units; decomposing the signed annual power contract of clean energy units into months; determining the monthly trading declaration curve of clean energy units; determining the monthly trading declaration curve of clean energy units; determining the time-slot declaration price of clean energy units; realizing the trading clearing by the power trading platform in accordance with the principle of “high-low matching”.

Abstract: Provided is a combined fabricating method for gradient nanostructure in the surface layer of a metal workpiece. A plastic deformation layer in great depth is induced by laser shock peening, then the surface of the metal workpiece is nanocrystallized by surface mechanical attrition treatment, and finally a gradient nanostructure is obtained in the surface layer of the metal workpiece with desirable layer thickness and optimized micro-structure distribution.

Abstract: The present invention relates to a combined fabricating method for gradient nanostructure in the surface layer of a metal workpiece, i.e., first, a plastic deformation layer in great depth is induced by laser shock peening, then the surface of the metal workpiece is nanocrystallized by surface mechanical attrition treatment, and finally gradient nanostructure is obtained in the surface layer of the metal workpiece with desirable layer thickness and optimized micro-structure distribution.

Abstract: A giant magnetoresistance current sensor comprises an amorphous alloy magnetic ring having an air gap; a DC magnetic bias coil wound onto the amorphous alloy magnetic ring; a DC constant current source supplying power for the DC magnetic bias coil; a giant magnetoresistance chip disposed in the air gap and having positive and negative outputs; an instrument amplifier having a non-inverting input connected to the positive output of the giant magnetoresistance chip, and an inverting input connected to the negative output of the giant magnetoresistance chip; an operational amplifier having a non-inverting input connected to an output of the instrument amplifier; a voltage following resistance connected between an inverting input and an output of the operational amplifier; an analog to digital converter having an input connected to the output of the operational amplifier; and a digital tube display connected to an output of the analog to digital converter.