Marc Chagall. The most famous aphorisms

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APHORISMS OF FAMOUS PEOPLE
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Aphorisms of famous people. Marc Chagall

Aphorisms of famous people

Free library / Aphorisms of famous people

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Marc Chagall. The most famous aphorisms

Art is first and foremost a state of mind. And the soul is holy for all of us walking on the sinful earth.
Personally, I'm not sure that theory is such a boon for art.
Our inner world is real, perhaps even more real than the world around us.
I don’t finish any work until I hear her “yes” or “no”.
I protest against the terms "fantasy" and "symbolism".

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Mining uranium from sea water 23.09.2012

At a recent meeting of the American Chemical Society in Philadelphia, a group of American scientists presented an original project to extract uranium from sea water. The scientists presented their calculations for mining uranium using a plastic adsorbent that can only capture 2 grams of uranium per kilogram of plastic.

Fossil and relatively easily accessible reserves of uranium on our planet are rapidly depleted. Therefore, scientists turned their attention to the oceans, which contain a huge amount of valuable material - 4,5 billion metric tons. However, this uranium is found in very low concentrations in sea water - 3,3 parts per billion. Therefore, the attractive idea of extracting uranium from sea water was just a beautiful theory for decades. Fortunately, modern technologies and materials for the first time can make this idea a commercially viable project.

The extraction of uranium using such material will look like this: an adsorbent is applied to the polymer substrate, after which the substrate is woven into a 60-meter "braid", which is taken out to the ocean by boat. "Spits" are attached to the bottom of the ocean, constructing a forest of artificial algae. After about 60 days, the boat returns, collects the adsorbent and takes it to the shore, where the uranium is eluted by traditional methods.

The adsorbent can be reused up to 6 times with a 5% drop in material efficiency with each reuse. These parameters have already been achieved by Japanese researchers and are real. In the future, the adsorbent can be used twice as many times, as well as reduce its cost. For example, dimethylformamide, which is used to wash polymers before being reshipped to the ocean, today accounts for 10% of the total cost of the entire offshore uranium mining system. So the prospects for reducing the cost of the process are great.

But even with today's advances, subsea mining can produce uranium at a cost of $1230 per kilogram—about 10 times more than conventional mining methods. So far this seems too high a price, but the cost of uranium is growing every year. At the same time, in the future, the cost of "marine" uranium can be reduced to $ 300. However, it should be borne in mind that millions of tons of plastic per year will need to be used to extract 5500 kilograms of uranium during the year.

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