The electromagnetic wave absorption properties of flake-shaped carbonyl-iron/paraffin composites with various volume concentrations were calculated by the measured complex permeability and permittivity. The complete electromagnetic wave absorption was searched for the volume concentration of 0.125, 0.15 and 0.20 at 5.8, 4, and 3.6 GHz, respectively. The permittivity is much larger than the permeability at the complete absorption frequency points. Based on the origin of the absorbing peaks, the contour map displaying the relationship between the complex permittivity and complex permeability at the perfect matching point was developed. The complex permittivity obtained from the contour map basically agrees with the experimental data for a given complex permeability. Hence, the contour map can be used to design the absorber for obtaining the excellent electromagnetic wave absorption.
The measurement data in the power system may be attacked and tampered during the transmission. For this problem, a data encryption and approximate recovery strategy based on double random sorting and CGAN is proposed. The double random sorting encryption algorithm is proposed based on the form of measurement data in plaintext. The randomness of pseudo-random number, random sequence and random sequence insertion will ensure the uncertainty of data block number, sorting order and insertion location of random sequence, which will definitely improve the security of measurement data. Besides, an approximate recovery strategy used to approximately recovery abnormal samples is proposed on the base of CGAN, which can ensure the accuracy of decryption. Finally, the feasibility, and effectiveness of the proposed method are analyzed on wind power and photovoltaic power historical dataset.
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