Induction motors are mainstay power components in industrial equipment. Fault diagnosis technology of induction motors can detect the incipient fault and avoid the unplanned shutdown. The broken rotor bar is a significant fault mode of induction motors. Classical fault diagnosis methods always have complex principles and high computational costs, which leads to difficulties in understanding and calculation. In this paper, a method of broken rotor bar diagnosis based on the sum-of-squares of current signals is proposed. This method can eliminate the fundamental frequency and extract the signature frequency components by calculating the sum-of-squares of three-phase current signals. The signature frequency components are more apparent in the spectrum of the sum-of-squares of current signals. The effectiveness of the proposed method under different load levels and rotation motor speeds has been validated by two experiments. Compared with the classical diagnostic methods, the proposed method has better effectiveness and lower computation cost.

Japan is the only country in the world that recognizes the legitimacy/legitimacy of triad. Yamaguchi Gumi is a typical representative of Japan’s underworld. The Yamaguchi-Gumi is the largest yakuza organization in Japan, the oldest and the richest in the world. It has a lot to do with the attitude and position of the government in its early stage of establishment, development, prosperity after revival and decline under pressure. This paper will start with the development process of the Yamaguchi Gumi and analyze its relationship with the government in different development stages. It believes that this different relationship and its transformation reflect the distinctive characteristics of The Times and the changes of Japanese society, and also has a profound impact on the future direction of the Yamaguchi Gumi. With the development of the rule of law society, the Yakuza, including the Yakuza, will be doomed to extinction.