Abstract: A photodiode chip, a photodiode, and a method for controlling a wavelength of a photodiode are provided. The photodiode chip sequentially incudes, above a substrate, a grating layer and a ridge waveguide layer. The ridge waveguide layer includes multiple ridge waveguides. Each of the multiple ridge waveguides corresponds to one column of gratings in the multiple columns of gratings below. The grating layer includes multiple columns of gratings. At least two columns of gratings have different grating period pitches.

Abstract: A multifunctional mixed oxide electrocatalyst material including a metal oxide A with oxygen storage capacity and a metal oxide B with oxygen evolution reaction is prepared by two-steps hydrothermal reactions. The electrocatalyst material is a good free radical scavenger, oxygen evolution reagent and able to alleviate carbon monoxide poisoning on catalyst, when it is applied in a membrane electrode assembly for fuel cells.

Abstract: The present invention discloses a blockchain-based data management and operation system and method for carbon emission/energy consumption of enterprises, and the method comprises the following steps: S1, the enterprise port collects operation data; S2, the data center control calculates regional production indicators and regional prediction data based on the operation data; S3, the data center control determines whether the regional prediction data exceeds the regional target data, and if so, obtains the regional energy consumption reduction task and the regional carbon emission reduction task according to the regional production data and the regional prediction data; S4, the data center control distributes enterprise-level assessment indicators to the enterprise according to the enterprise-level production indicators and the regional production indicators; S5: the enterprise port and the regional data display port visually display the data respectively.