Free books, magazines, collections published in 1983

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Content of books and magazines / Year 1983

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IX All-Russian Olympiad for schoolchildren

nx = xn

V Moscow Tournament of Young Physicists

XIV International Physics Olympiad

XVII All-Union Olympiad in Mathematics

XVII All-Union Physics Olympiad

XXIV International Mathematical Olympiad

And if... what then?

Machine for home

Automatic gas and liquid detectors. Farzane N.G., 1983

Automatic battery charger

Active volume and tone controls

Algebraic and transcendental numbers

Anatoly Petrovich Aleksandrov (on the occasion of his 80th birthday)

Antennas for 160 m band

Arithmetic and counting principles

Aphorisms of Academician P.L. Kapitsa

Conversation with Andrey Nikolaevich Kolmogorov

Bim and Bom

Touch control alarm clock

In the depths of the universe. Fragment of a painting by A. Sokolov

To the philatelic collection

Around the bisector

All-Union review Young technicians, naturalists and researchers - to the Motherland!

flaring x-ray stars

Outstanding theoretical physicist of the 75th century (on the occasion of the XNUMXth anniversary of the birth of L.D. Landau)

High quality class B amplifier

High quality 50W bass amplifier

Where it is thin, there it is torn

TV test signal generator

Generators on the chip K122UN1

Let's heat the water from above

Given... Required to be determined

Dynamic model of pn junction

The house that was built...

phony fact

Once again about electronic clocks on micropower integrated circuits

For saving electricity

Mysterious Pluto

Task for research

Problems M781-785, F793-797 and solving problems M759-761, M763, M764, F778-782

Problems M786-790, F798-802 and solving problems M765-769, M771-774, F783-787

Problems M791-795, F803-807 and solving problems M770, M775-779, F788-792

Problems M796-800, F808-812 and solving problems M780-785, F793-797

Problems M801-805, F813-817 and solving problems M786-790, F798, F799, F801, F802

Problems M806-810, F818-822 and solutions to problems M791, M792, M794, M795, F803-807

Problems M811-815, F823-827 and solving problems M796-798, F808-812

Problems M816-820, F828-832 and solving problems M801-805, F813-817

Problems M821-825, F833-837 and solving problems M806-810, F818-822

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Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Inspiration is born between sleep and wakefulness 18.12.2021

History knows many cases when inspiration came to great people in a dream, and these great ones sometimes even used special methods in order not to forget their sleepy insights. For example, Thomas Edison and Salvador Dali, thinking about some difficult creative task, lay down to take a nap, holding something heavy in their hands. When they started to fall asleep, the hand relaxed, the object fell to the floor and woke them up - and then it turned out that the solution to the creative problem was already in their head.

Employees of the Sorbonne University decided to test this method and invited one hundred and three people for the experiment, who were also supposed to doze off with a heavy object in their hand. Before falling asleep, they were given a mathematical problem: several number sequences had to be continued by one more number, and in order to get this number, two mathematical rules had to be applied to the sequence. However, the solution to the problem could be easier if you noticed that the required number is always the same as the second number in the sequence.

The participants in the experiment recorded the electrical activity of the brain to monitor how their brain falls asleep. We know that there is REM sleep, or REM sleep, with rapid eye movements, and non-REM sleep, or NREM sleep. But there are several stages in non-REM sleep, and one of them, called N1, looks like an intermediate state between sleep and wakefulness: brain waves are rebuilt into a sleepy state, but it seems to the person that he is not sleeping yet. After stage N1, other, deeper stages of non-REM sleep begin.

The first stage of sleep really awakened the creative powers of the brain. If a person solved the above problem without falling asleep, then a simpler solution came to mind in 30% of cases, but if he fell asleep and immediately woke up, then this solution came to mind already in 83% of cases. Stage N1 lasted at least 15 seconds, and it was important not to fall into a deeper sleep - otherwise the brain would forget what it had thought of.

Perhaps the "pre-sleep" stage can indeed be recommended to those who urgently need to awaken their creative forces. True, it would be nice if some kind of device appeared here that would wake you up a few seconds after you dozed off - after all, falling asleep with something heavy in your hand is not very convenient.

News feed of science and technology, new electronics

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