An analysis on Fu’s work of realizing Maxwell’s demon

In 1982, Fu presented his work on realizing Maxwell’s demon. Fu declared that a perpetual current was obtained in his device. This means that a new machine of the second kind of perpetual motion has been invented. In this paper, the author gives a detail analysis on Fu’s work, and the following conclusion has been obtained: (1) In Fu’s experiment, the object centrolled by the magnetic field was electrons in mass, not in individuality. The magnetic field did not separate electrons individually into a high-speed group nor a low-speed group. For this reason, it was not a “demon”. The whole process in the experiment was a mass-flowing process of an enormous amount of small particles. This must belong to the area of thermodynamics. (2). The current flowing in Fu’s device is actually the initial velocity current of a vacuum diode. (3) The initial velocity current is, in turn, a modified form of Thomson thermo-electric effect, which requires a hot tank and a cold tank, obeying the second law of thermodynamics. (4) The role of action of the magnetic field is to control electronsin mass, causing a waak rectification in the device. The current should vanish if there has no such action, because the initial velocity electrons should eliminate by each other. (5) Fu’s approach was not a proper approach to realize the Maxwell’s hypothesis.