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Hybrid trash can with slot machine

15.07.2003

How to get the main consumers of non-alcoholic and low-alcohol drinks in cans - young people to throw empty cans only in the trash? Two graduate students from the University of Lyon (France) came up with a fruitful idea and managed to implement it.

Six cabinets resembling drinks vending machines appeared on campus. There is no slot for coins in them, but there is a round hole where you can push an empty jar. As soon as this is done, in the front wall of the cabinet, behind the glass, three reels with drawings begin to spin, like in a slot machine. If all three reels land on the same symbols, you get a win for an empty jar. It can be a lollipop, a keychain, a pack of chewing gum, a ballpoint pen, and if you are especially lucky, a leather case for a mobile phone.

On average, every fourth jar brings a win. The innovation aroused the enthusiasm of the inhabitants of the campus, and each machine began to hand over to scrap metal collectors about 500 cans a week. Resourceful students, having not yet received a diploma (they study at the Faculty of Economics, and the defense will certainly be successful), founded their own company.

Machine guns have appeared in stadiums, parks and cultural centers of Lyon, and by next year their number in the city will reach two hundred. Then the company intends to expand its activities to the whole of France. Sixty per cent of the young Lyons interviewed admitted that before the advent of these devices, they always threw an empty jar anywhere.

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A new method for fast optical distance measurement 06.03.2018

The microresonator-based optical frequency comb enables extremely accurate distance measurements at a record speed of 100 million measurements per second. As a demonstration of how the new method works, researchers from the Karlsruhe Institute of Technology (KIT) and the Swiss Ecole Polytechnique Federale de Lausanne (EPFL) demonstrated the process of scanning the surface of a bullet flying at a speed of 160 meters per second, when In this case, the scanning accuracy was no worse than one micrometer at any given time. The new technology relies on a solitron optical frequency comb based on a microresonator fabricated on the surface of a silicon nitride chip. And further development of this technology will make it possible to create high-precision high-speed three-dimensional cameras and compact laser scanners of the LIDAR type.

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In a new method for measuring distance, the researchers used two optical chips that generate two identical frequency combs. The light from one chip was used to measure the distance, and the comb generated by the second chip served as a reference signal.

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