http://arxiv.org/abs/physics/0311104
This is an experiment report on a special energy conversion. Two similar and parallel Ag-O-Cs cathodes in a vacuum tube eject electrons at room temperature continuously. A static magnetic field applied to the tube plays the role of the famous "Maxwell's demon". The thermal electrons are so controlled by the magnetic field that they can fly only from one cathode to the other, resulting in a charge collection and an electric potential. A load, a resistance for example, is connected to the cathodes, getting an electric power from the tube continuously. Here, the air within the laboratory is a single heat reservoir and all of the heat extracted by the electronic tube from the reservior is converted into electric energy, without producting any other effects. The Authors believe that the experiment is in contradiction to Kelvin's statement of the second law of thermodynamics.
