To guard against frequent shoplifting, shopkeepers often attached to the product specific tags that come off at the checkpoint after the purchase paid These tags are tiny devices that when you try to make a product out of the store without paying, include the output alarm, triggered by the resonance amplification of the radio signal coming from small transmitters installed at the exit of the store, however, this method is not sufficiently reliable, because the thief could screen the label with a piece of foil. The American firm «Check Mate Systems» writes the magazine «Newsweek», began selling a new magnetic system to deal with thieves. In this system, a control tag made of a magnetic composition and the output from the store highly sensitive magnetometers mounted. The system is adjusted so that it did not react to the small value of metal objects (keys, watches, belt buckles and jewelry), but begins a desperate ringing when the «notes» magnetized control tag. The strong magnetic field generated by tag, prevents any attempt to conceal or hide the stolen goods.
PLASMA paint houses
A new way of processing and staining concrete surfaces using plasma developed at a research institute of electric power, according to the magazine «Hungarian News». Specialists discovered this technique during thermal testing of concrete. Its essence — the formation of high-temperature plasma by heating a nitrogen gas moving at high speed between the two electrodes. Heated to a high temperature plasma for a short time in contact with the concrete surface so that its outermost layer is heated to the melting point during the cooling of acquiring a light green color, resembling ceramic lining. For bronze, black, blue, green or white on the concrete before firing sprinkled corresponding metal oxide. Resulting in this layer is durable, frost, beautiful. A pilot plant of six plasma torches hour stain about 50 square meters. meters of surface.