Free books, magazines, collections published in 1984

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Content of books and magazines / Year 1984

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125 years ago. Spectral analysis

60 years of people's radio laboratory

VI Moscow Tournament of Young Physicists

X All-Russian Olympiad for schoolchildren

XV International Physics Olympiad

XVIII All-Union Olympiad in Mathematics

XVIII All-Union Physics Olympiad

XXV International Mathematical Olympiad

Automatic switches of the A3700 series. Gorobets A.S., Evzerova I.Kh., 1984

Automatic charger

car tester

Hitchhiking in a cassette recorder

Active VHF filters. Filinyuk N.A., 1984

Al-Khwarizmi (to the 1200th anniversary of his birth)

Safety of rigging during installation. Kornilovich O.P., 1984

Non-contact magnetoelastic torque sensors. Levintov S.D., Borisov A.M., 1984

Power supply for amateur radio devices

In a sea of tears

In the mind and on the fingers

Visible contours

Down the rabbit hole

Around the problem of Sylvester

Waves of crystallization

The rotation of the Earth and the acceleration of free fall, two types of electricity (from the history of physics), Fermat's principle

Universe

Module selection

Module selection (task)

Select vertices of a convex k-gon

The beginning of high geometry... (to the 300th anniversary of the first publication on differential geometry)

halo and ice

harmonic series

Where is the error ?, another method of self-control, is it necessary to do a check?

Where did Petya and Vova go wrong?, geometry helps to solve equations, dihedral and trihedral angles

LF generator

Kisinus hydropanic (examiner's notes)

Two problems about Fibonacci numbers

Circular motion

The deeds and antics of fairy Morgana

Day of Knowledge

Decoders on K155REZ chips

Complex Function Differentiation

Differential busbar protection 100-220 kV. Taubes I.R., 1984

Proof of Mordell's conjecture

If Pathfinder knew physics

If the masses are replaced by the area

Another step towards absolute zero

Task in pictures

Problems M841-845, F853-857 and solving problems M826-830, F837-841

Problems M846-850, F858-862 and solving problems M831-835, F842-846

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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

Technique against pirates 18.12.2000

You are mistaken if you think that the pirates remained somewhere in the seventeenth century. In the waters of Southeast Asia, pirate attacks on cargo ships are now quite common. Over the past four years, the number of attacks on Japanese merchant ships has increased fivefold. And all over the world in 1999 there were more than three hundred cases of piracy. It got to the point that the team of the Japanese icebreaker "Sirase", which set off for Antarctica last fall, when passing through the most "pirate-dangerous" zones off the coast of Indonesia, tightly battened down and tied all the doors from the inside with ropes, and water cannons were placed on the deck to wash away those climbing on board of pirates.

The methods of the pirates have remained the same: the ship is boarded by throwing hooks with ropes or rope ladders on board.

In July of this year, 15 Japanese bulk carriers were equipped with a simple protection system. A wire connected to a tension sensor was stretched along the deck railing. When the hook breaks or pulls on the wire, an alarm sounds and powerful spotlights are turned on. But ships are equipped with more sophisticated anti-piracy devices.

An attack is automatically notified by satellite to the Coast Guard and the shipowner, one of which is about the size of a shoe box, and no one on the ship knows where the box is hidden so the pirates can't turn it off.

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Lighting. Article selection

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▪ article What does the queen say to the knighted during the ceremony? Detailed answer

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▪ article Relay control at low voltage. Encyclopedia of radio electronics and electrical engineering

▪ article Organization and operation of electrical installations. Electrical management. Automated energy management systems. Encyclopedia of radio electronics and electrical engineering

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