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Place windmills tightly

28.12.2009

"When a school of fish swims, each creates a small whirlwind that helps move its neighbor. This is the principle we decided to apply to improve the efficiency of wind farms," says Robert Whittlesey, a graduate student at the California Institute of Technology, who works in the laboratory of Professor John Dabiri, who studies motion. Living creatures.

The fact is that if the windmills are placed too tightly, then their overall efficiency will drop, since the wind power will be spent on the rotation of the blades. Robert Whittlesey calculated an alternative windmill system. In them, the blades do not rotate perpendicularly, but parallel to the surface of the earth, and the windmills themselves are located in the same way as fish in a school.

As it turned out, in this case, each next turbine is in the zone of action of the vortex created by the previous one. As a result, the amount of energy collected per unit area built up with windmills increases a hundred times.

If the idea is taken advantage of by wind energy, there is apparently a chance that the cost of this type of energy will decrease and approach that of coal or nuclear power plants.

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Deadly danger of apples 26.09.2016

Apples are often called the "fruit of health" because they contain many vitamins and antioxidants. However, it is impossible to eat a whole apple, with a core and seeds.

There is a proverb in English: “An apple a day keeps the doctor away”: it has been established that eating apples is useful for the prevention of many diseases, including cancer. Although apples do not contain as much vitamin C compared to other fruits and vegetables, they are rich in antioxidants. Apple fiber stimulates intestinal motility, has a positive effect on heart function and lowers cholesterol levels.

Some nutritionists even advise eating whole apples, but this is an erroneous opinion: apple seeds contain a deadly compound - mandelic acid nitrile gentibioside C20H27NO11, or amygdalin. It is also present in the pits of cherries, almonds, peaches, and many plum plants. The specific gravity of amygdalin in different fruits is different: if for almonds and peaches it is about 2,5-3%, then for apricot this figure is at the level of 1,8%, and for apples - 0,6%.
Scientists remind of the danger lurking inside the fruit. In mild cases, amygdalin poisoning is manifested by headache and nausea; in severe cases, cyanosis, convulsions, loss of consciousness are observed; even death is possible.

In New Zealand, cases of amygdalin poisoning have been reported after eating 30–60 apricot kernels. The exact number of whole eaten apples that can be harmful to health has not been calculated, but one should not forget that their bones, albeit in low concentrations, contain poison.

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