Roof shelf. Drawing, description

BUILDER, HOUSEHOLDER
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Roof shelf. Tips for the home master

Builder, home master

When repairing and painting a metal roof, there is a need for a device to hold the tool on the roof slope. A simple shelf made of wooden bars with magnets at the bottom of the frame will help out.

If necessary, the tool platform itself can have a railing collar.

Roof shelf

Author: S.Ostriy

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Sand based anti-counterfeiting system 04.02.2018

Scientists at the University of Copenhagen have developed a new sand labeling system that they say could put an end to counterfeit goods.

The optical authentication system is based on ordinary sand with impurities of three rare earth lanthanides (metal substances) - europium, terbium and dysprosium - which glow when exposed to different wavelengths.

A small piece of sticky tape is lowered into a container of sand, and thousands of grains of sand stuck to it form a unique pattern. This pattern can then be applied to metal, glass or leather.

Then the label is photographed under the influence of different wavelengths and three images with particles of europium, terbium and dysprosium are superimposed one on the other. Further, this information is digitized and stored in the manufacturer's database. A special device and a digital key are used to verify the product.

According to the calculations of the developers, the encoding capacity of the system is 6x10 to the 104th power, which eliminates the possibility of forgery.

The cost of applying one label will be about one Danish krone. Now scientists are testing technologies for scanning such "fingerprints".

Such a system could become available as early as next year.

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