On what occasion was G. Verdi's opera Aida created? Detailed answer

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On what occasion was G. Verdi's opera Aida created? Detailed answer

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On what occasion was G. Verdi's opera Aida created?

The later world-famous opera "Aida" was performed on December 24, 1871 at the Italian theater in Cairo in honor of the opening of the newly built Suez Canal.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

What is a lemur?

Lemurs are the most primitive members of the primate order, which includes monkeys. Nowadays, lemurs can be found in Madagascar, in Africa and in some Asian countries. Once they lived in America and Europe, where their fossilized remains are found.

Lemurs differ from other primates in their long, fox-like muzzle, and in the fact that instead of nails, they have claws on their toes. All lemurs live in trees. It is not very common to see lemurs in the zoo because they do not survive well in captivity.

Lemurs live on a mixed diet that includes fruits, seeds, insects, bird eggs, or meat. Some of them are active during the day, some at night. There are many varieties of lemurs, many of which are quite interesting. One species of large lemur lives in Madagascar - "sifaka". It has a bright color - black and white with red or brown spots. Between his arms and body there is a fold of skin that apparently allows him to make long jumps from tree to tree.

Another group of lemurs are called "true lemurs", of which thirteen species live in Madagascar. They all have long tails and vary greatly in color. The smallest of the lemurs is 13 centimeters long, and the tail is as much as 15 centimeters. This is the so-called "mouse lemur". During feeding times, these little creatures accumulate fat around the base of the tail. During a drought, they sleep in the hollows of trees, using fat in the tail to maintain their vital activity.

Aye-ayes are very different from other Madagascar lemurs. They have very large ears, long coarse hair, a long fluffy tail and long fingers. He has nails on his big toes, but claws on the others. Another species of lemur - the tarsier - has such a flexible neck that it can turn its head 180 ° without turning around!

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Key Optical Transistor Technology 19.07.2013

Scientists and engineers from the Technical University of Vienna were able to control the polarization of a terahertz light beam, which is the basis for creating promising optical microcircuits.

Scientists have managed to change the polarization of a light beam (the direction of light oscillations) using a special material and an electric current. This laboratory technique has the potential to be scaled up and applied to industrial production, paving the way for the mass production of high-speed electronics that are controlled by light rather than electric current. In addition, the control of terahertz radiation can be useful not only for the production of optical computers, but also, for example, for the manufacture of scanners and medical devices.

Light can oscillate in different directions, that is, have different polarizations. This phenomenon has long been known and widely used, for example, in 3D television. Scientists from Austria for the first time managed to control the polarization of light at the micro level. An electric field applied to an ultrathin layer of telluride, mercury, allows you to arbitrarily change the polarization of light. In this case, terahertz light radiation was used, that is, the optical chip can operate at a much higher frequency than current processors with their 3-5 GHz.

One of the advantages of the Austrian invention is the very low power consumption. To change the polarization of terahertz light radiation using an electric field, a voltage of less than 1 V is required.

Thus, scientists and engineers from the Technical University of Vienna have created a technology that could revolutionize the electronics industry. Of course, modern production technologies and the principles of electronics are very firmly rooted, but let's hope that the advantages of optical transistors will eventually outweigh all the costs of reforming production.

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