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Silent Submarine

29.01.2002

Until now, all submarines were propelled by propellers. But perhaps things will change soon.

American scientists from the University of Texas are developing a submarine that will swim like a fish thanks to the flapping movements of its hull. A working prototype of this type of submarine, 1 m long, has already been created. The new drive allows the submarine to move almost silently, since it leaves very little turbulence behind it, rather than a powerful turbulent jet.

The back of the boat's hull consists of six movable elements made of an alloy of nickel and titanium. This alloy has a so-called memory effect, due to which the body elements change their shape depending on the temperature.

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Danger of welding fumes 10.01.2019

An international team of scientists has found that no matter what type of electrode is used, welding will still produce harmful smoke.

This smoke will always contain solid nanoparticles of oxides of iron, manganese, silicone (about 41%, 18% and 6% respectively), as well as chromium. The average particle diameter is 5 nanometers, but there are also smaller ones among them. Metal oxidation products are generally toxic, but particles approaching 1 nanometer in size are of particular danger - it is known that they can even penetrate the human nervous system.

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