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Transmission of radio signals with almost no energy consumption

29.01.2023

According to the second law of thermodynamics, any process of energy transfer (including radio waves) is associated with its costs. That is, in fact, it is impossible to create a "perpetual motion machine", because without the expenditure of energy it cannot produce it. But scientists from Stanford managed to create a data transmission technology that uses almost no energy at the receiver.

They found that in the case of receiving a radio wave transmission, the energy does not have to come from the transmitter. In many cases, such as when transmitters need to be small and portable, their consumption can be reduced or eliminated by backscattering technology.

In this case, the only power needed for the transmitter is used for the transistor. Because the transmitter uses very little power (enough to switch a transistor), it doesn't need bulky batteries. The idea is that the signal source is at a higher temperature than the antenna, so that when the circuit is closed, current will begin to flow in it due to the temperature difference.

This makes the new technology ideal for medical implants and other devices that often cannot be recharged. The receiver needs a lot of power, but it can be a base station connected to the network or a large battery. This new technology is less complex than backscatter systems, which may make it more accessible and practical in some situations.

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During the holidays, students get stupid 07.01.2002

This conclusion was reached by the German psychologist Siegfried Lerl from the University of Erlangen, who is also the chairman of the German Society for the Development of Mental Abilities.

After conducting multiple psychological tests, Lerl found that three weeks of vacation lead to a decrease in intelligence quotient by 20 units. A prolonged decrease in mental activity causes "drying" of nerve cells in the frontal lobes of the brain, explains the psychologist.

You can counteract this process by setting aside half an hour on each vacation day for puzzles or chess. The psychologist simply did not dare to recommend solving one or two problems from a school textbook a day.

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