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What mistake led to the appearance of a mythical animal on the coat of arms of the Irkutsk region? Detailed answer

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What mistake led to the appearance of a mythical animal on the coat of arms of the Irkutsk region?

The old coat of arms of Irkutsk depicted a babr (as the Ussuri tiger used to be called) holding a sable in its mouth. In the decree of the Senate of 1878, a mistake was made in the description of the coat of arms - a beaver appeared instead of a babr. The artists had to add a large beaver tail and webbed hind legs to the babr, creating a new mythical animal.

Authors: Jimmy Wales, Larry Sanger

 Random interesting fact from the Great Encyclopedia:

Why do we need eyebrows?

In all mammals, various parts of the body are covered with hair. For most of them, hair plays the role of an insulating material that protects the body and helps maintain a constant temperature in it. Humans have less body hair than animals. The development of "hairline" in adults is regulated by the gonads. Male sex hormones help the growth of hair on the body and chin, while inhibiting their growth on the head.

The action of female hormones is just the opposite: they inhibit the growth of hair on the body and help them grow on the head. Scientists know all this, but nevertheless they cannot fully understand the purposes for which the hairs on different parts of the body serve. One thing is certain: some places are covered with hair to protect against dust and insects. That is why they grow, for example, in the nose and ears. And, apparently, we need eyebrows and eyelashes to protect our eyes from dust.

Charles Darwin believed that fine hairs on the body serve as a kind of "gutter" for sweat and raindrops that fall on the skin. It is also believed that the beard is an external sexual sign that allows you to see the difference between a man and a woman, even at a distance. It gives the appearance of a person masculinity and solidity.

In total, a person has from 300 to 000 hairs on his body. Blondes and blondes have thinner and more hair, brunettes and brunettes have thicker hair and about one-quarter less hair.

 Test your knowledge! Did you know...

▪ Which household appliance was first advertised for the idea of ​​a hair dryer?

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See other articles Section Big encyclopedia. Questions for quiz and self-education.

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CoolSiC 1200V Silicon Carbide MOSFETs in TO247-3/-4 Package 16.01.2020

Infineon's new 1200V CoolSiC MOSFETs in the TO247-3/-4 package are based on state-of-the-art semiconductor technologies and optimized for high performance and reliability.

The advantage of using SiC transistors compared to Si solutions is higher efficiency, which is especially important for power conversion systems. Compared to Si-based IGBTs and MOSFETs, SiC MOSFETs have several advantages: the lowest gate charge and capacitance levels among 1200V switches, no internal diode recovery loss, low temperature-independent switching loss, and no-threshold characteristic.

CoolSiC MOSFETs are great for hard and resonant switched topologies such as power factor correction (PFC) circuits, bi-directional topologies, DC/DC converters or DC/AC inverters.

Features:

Low switching losses;
Non-threshold characteristic;
Wide gate-source voltage range;
Gate threshold voltage VGS(th) = 4,5V;
Controlled voltage slew rate (dV/dT);
Robust current-carrying diode for hard switching;
Switching losses are independent of temperature;
Maintaining operability in the event of a short circuit for 3 μs at a gate voltage of 15 V.
Available for order in TO247-4 packages. This package has an additional source signal pin to optimize the switching process.

Application:

Solar energy conversion systems;
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Power supplies;
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