Who are the barbarians? Detailed answer

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Who are the barbarians? Detailed answer

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Who are the barbarians?

The ancient Greeks, and then the Romans, considered themselves the only civilized people. Everyone else they called barbarians.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

Who invented the balloon?

One evening in 1781, the French inventor Joseph Montgolfier noticed how his wife, passing by the fireplace, swelled a silk peignoir. This led the inventor to some thoughts. Joseph and his brother Etienne set fire to scraps of paper under a silk ball and watched it inflate and fly up.

This is how the idea of a balloon filled with heated air (smoke) was born. Hot air balloon (this name was given to the ball made by Joseph and Etienne) was a linen bag with a diameter of about 30 meters, covered with a layer of paper. The brothers carried out the first successful launch of the ball (without a crew) on June 5, 1783 in their hometown of Vidalon-les-Annon. After the experiment, they were invited by the Paris Academy of Sciences to launch a balloon in the capital.

Thus began the era of balloons. There is, however, not very reliable information about much earlier flights. For example, about the balloon that rose in Beijing in 1306 during the ceremony of accession to the throne of Emperor Fo Kien. Or about the balloon that the Portuguese monk Bartolomeo de Cusmao flew in 1709.

But still, June 5, 1783 is considered the official birthday of the hot air balloon (aerostat).

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Nanodevice generator 23.04.2010

A generator has been created that can draw energy to power nanodevices from the external environment. The work of Professor Zhong Linwang of the Georgia Tech University to create electricity generators based on zinc dioxide nanorods has led to another success: the new generators were able to provide power to sensors for the acidity of the solution and ultraviolet radiation.

Zinc dioxide is a piezoelectric, its crystals are capable of generating electricity when deformed. According to an improved technique, a brush of such crystals is chemically grown on a gold-coated substrate. Then it is filled with methyl methacrylate and the upper part is bled off with plasma. As a result, the generator is protected from the environment, and all bristles are of equal length. On top of the resulting plate is attached a layer of silicon with a platinum coating.

Such a generator of 20 bristles at a strain oscillation amplitude of 2% per second gives a potential difference of 1,2 V. A generator of 700 horizontally arranged zinc dioxide fibers created in a similar way gave a peak potential difference of 1,26 V with a strain of only 0,19%. One cubic centimeter generator of three layers of zinc dioxide brushes provides 2,7 mW of power.

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The source of deformation for the generator can be tides, and sound waves, and mechanical vibrations like the flutter of a flag in the wind, and the pressure of the foot on the sole of the boot, and the movement of clothing elements.

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