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As of May 19, 2024 in the database 500000 articles

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metal detectors

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Metal detector accessories and other useful things, Household metal detector, Choosing your first metal detector, Metal detector detection depth, Depth metal detector, Metal detector, Metal detector disc probe, Differential magnetometer, Treasure detector law, Pulse metal detector, Metal indicator, History of metal detectors, Cable detector metal detector, How to search for treasures, Quartz beat metal detector ... all articles of the section >>


Regularly replenished compilation the most interesting news of science and technology, new electronics. Large archive of articles from 2000 to 2024. Based on materials from periodicals and the Internet.

Latest news of science and technology, new electronics:

Blinking of the magician and his audience 19.05.2024

Magic and illusions have always captured the attention of the public, but what happens behind the scenes of the magician and in the brains of his audience? Scientists from the UK decided to solve this mystery by conducting a new study involving ten illusionists of varying experience. Illusionists, some of whom had been practicing magic for more than half a century, others for only six months, were invited to demonstrate the same trick - the popular coin trick. Recordings of their performances during training and on stage showed that each of them began to blink significantly more often at the moment of performing the trick. The study's findings indicate that magicians' blink rate may be related to unconscious aspects of their performance. At the same time, as scientists have found, spectators also begin to blink more often, following the movements of the illusionist. This observation supports the idea that magicians may be catalysts for blinking in audiences. Additional research has shown that magicians blink more often during ... >>

Ultrasonic coffee machine 19.05.2024

Iced coffee has become an integral part of coffee culture in recent years. Therefore, engineers from the University of New South Wales decided to improve its preparation. They have developed an ultrasonic coffee machine that reduces the cold brew time for ground coffee beans from 12-24 hours to significantly less time. Iced coffee, or "Cold brew", is popular due to its smoothness, low acidity and low bitterness. It is prepared by steeping ground coffee in cold water for a long time. Unlike traditional hot brewing, which often imparts bitterness to coffee, cold brewing extracts more delicate and complex flavors from the coffee beans. The innovative system, presented by a team of engineers, introduces ultrasonic technology into the coffee preparation process. The system uses ultrasonic waves to speed up the process of extracting oils, flavor and aroma from ground coffee. This allows you to significantly reduce the time ... >>

The speech of sperm whales is similar to that of humans 18.05.2024

In the world of the ocean, where the mysterious and unknown coexists with the studied, sperm whales, with their huge brains, are of particular interest to science. Researchers, working with a huge array of audio recordings collected during the Dominica Sperm Whale Project (DSWP) - more than 8000 recordings, seek to unravel the secrets of their communication and understand the structure and complexity of the language of these mysterious creatures. By studying in detail the recordings of 60 sperm whales in the eastern Caribbean, scientists have revealed surprising features of their communication, revealing the complexity of their language. "Our observations indicate that these whales have a highly developed combinatorial communication system, including rubato and ornaments, which indicates their ability to quickly adapt and vary during communication. Despite significant differences in evolution, sperm whales have elements in their communication that are characteristic of human communication," says Shane Gero, a biologist at Carleton University and director of the CETI project. Issl ... >>

Random news from the Archive

Dirty air makes people stupid 01.09.2018

According to a new study by scientists in the US and China, prolonged exposure to polluted air affects human cognitive performance.

To investigate the link between air pollution and cognition, the researchers turned to the results of the China Family Panel Studies, an annual test of Chinese citizens that includes verbal and mathematical tests of cognitive performance. The scientists especially focused on the results obtained from 2010 to 2014 in 162 randomly selected Chinese regions. In total, about 20 people participated in the study in this way.

They then used official air pollution data to calculate how much a person was exposed to it between inspections. So scientists were able to determine how dirty air affects the human intellect.

The results were rather unpleasant, especially in the case of older people. “We already understand that air pollution can reduce the level of education for a whole year, which is a huge figure,” says Qi Chen, one of the researchers. “But we also found that this effect is even more pronounced in older men over 64 and with low level of education. If you calculate the cognitive losses for them, then there the number goes on for several years. "

Researchers do not yet know why pollution has such an effect. But they are sure that it causes mental decline - that is, it is not just a correlation between the two indicators. Perhaps the whole point is that such air adversely affects the white matter in the brain.

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Encyclopedia of radio electronics and electrical engineering. Articles with diagrams, illustrations, comments

In section Encyclopedia of radio electronics and electrical engineering presents the most interesting electronic designs, diagrams, descriptions, reference materials with illustrations and explanations.

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Encyclopedia of radio electronics. The best articles for radio electronics


Encyclopedia of electrical engineering. Best Articles for an Electrician


Effective means for relaxation and good mood

A random story from the life of a radio amateur:

It was in the early 90s, well, you all probably remember (the end of perestroika, economic reform, etc.). I was called to repair the TV by some familiar guys from ... a sobering-up station, that is, employees of the "glorious" institution of the Ministry of Internal Affairs. TV "Rassvet" had previously been repaired by some client of the establishment, but never completed the repair. I spent two whole days trying to find the reason for the signal not passing through the UPCH, the reason turned out to be a trifling break in one leg of the capacitor ... but the break was made by side cutters, and the output was hidden inside the capacitor. Well, the root cause of the TV malfunction was a break in the 150v circuit at the PTK. From this story, I concluded that sometimes very creative personalities get into the sober.
Other stories from the life of radio amateurs | Random fun story

Random fun puzzle:

Who, when flying, screaming, waving its claws?

Other fun puzzles | Random fun puzzle

Random Question Quiz Online:

There was originally a different question in this fight, but he proved to be unusable and had to be replaced. So, answer: what did Robert Louis Stevenson call a long conversation interrupted by arguments?

Other Quiz Questions | Random five questions

Random aphorism:

“There is so much good in our bad side and so much bad in our good side that everything else that is in us is not even worth talking about.” (Robert Stevenson)
Other aphorisms | Random aphorism

Random proverb:

Excessive modesty hides pride. Japanese proverb
Other proverbs of the peoples of the world | Random proverb

Random phraseological unit:

Old regime
(In Russia, this is what they began to call the system that existed in the country before the February Revolution of 1917)
From French: "L" ancien riigime ". The expression meaning the regime that existed in France before the French Revolution of 1789 entered the literary speech after the appearance in 1856 of the book of the French historian and politician Alexis Tocqueville (1805-1859)" L "ancien riigime et la revolution" ("The Old Regime and Revolution", in another translation - "The Old Order").
Other phraseological units | Random phraseological unit

Random phrase in Latin:

Vox populi vox Dei. - The voice of the people is the voice of God.
Other phrases in Latin | Random phrase in Latin

Random fact "Did you know?":

Studies to test the effectiveness of acupuncture treatment conducted in different countries give different results. In Japan, China, Korea, Mongolia and other Asian countries, where this method is traditional, success is one hundred percent. In Europe, the effectiveness of acupuncture is estimated at 20 percent, and in the US - at 50 percent. Apparently, it is very important that both patients and doctors believe in the success of the treatment.
Other Facts "Did You Know?" | Random interesting fact

Random article of the Great Encyclopedia for Children and Adults:

Why is the earth hot inside?

The thickness of the outer part of the earth's crust in different places ranges from 15 to 50 km, and its temperature increases as it approaches the center of the earth. Approximately every 40 m it increases by one degree. At a depth of three kilometers it is so hot that if you lower a glass of water there, it will begin to boil!

If it were possible to descend 50 km deep into the earth's surface, then the thermometer would show 1100 ° C. In such conditions, even rocks begin to melt. According to scientists, in the center of the Earth the temperature reaches 5500 °C.

The earth's crust consists of two layers. The upper one is the granite slabs of the continents. Beneath it is a thick layer of very hard black rock called basalt. It forms oceanic depressions, and continents rest on it. The center of the Earth, according to scientists, is a hot ball of liquid iron with a diameter of about 6500 km.

Why is this the case? According to most scientific theories, the Earth once separated from the Sun. It was a fiery mass of gaseous, liquid and solid substances when it began to revolve around the Sun.

Over time, this mass cooled down somewhat and decreased in volume, gradually, due to constant rotation, taking the form of a ball slightly flattened at the poles. Finally, it cooled down so much that a hard crust formed on its surface.

No one can say how long this process lasted, but the available facts indicate that, apparently, the core of the Earth, hidden under a solid shell, still remains the very original fire-breathing mass.

Other articles of the Great Encyclopedia | Random article of the Great Encyclopedia

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