Free books, magazines, collections published in 1989

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FREE TECH LIBRARY
Content of books and magazines / Year 1989

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I All-Russian Olympiad in Informatics

I International Olympiad in Informatics

II All-Union Olympiad for Schoolchildren in Mathematics

V All-Union Scientific and Technical Conference of Schoolchildren

XII tournament of young physicists

XIX meeting in Batumi

XIX International Physics Olympiad

XV All-Russian Olympiad for Schoolchildren in Mathematics and Physics

XX International Physics Olympiad

XNUMXst century: energy from space?

XXIII All-Union Olympiad in Mathematics

XXIII All-Union Physics Olympiad

XXIX International Mathematical Olympiad

XXX International Mathematical Olympiad

Light effects machine

Automatic control of the electric pump

Alpha particles and Rutherford's experiments

Ambigrams

Hourglass arithmetic

Arithmetic error in War and Peace

Bisectors, inscribed and uncircumscribed circles of a triangle

Alarm. Statement. Refutation

Bursak Entertainment, or Three Interpretations of the Actions Performed by a Bursak named Tsaplya

Household radio-receiving and sound-reproducing equipment. Alekseev Yu.P., 1989

Household electronic machines. Zelensky V.A., Khromoy B.P., 1989

In the world of powerful sound

In the mysterious world of endless rows

Variations on a Theme of Euclid

Eternal light bulb?

Looking at the thermometer

Video players

Fiber-optic converters with external modulation. Zak E.A., 1989

Questions, questions

High-frequency protection lines 110-220 kV. Budaev M.I., 1989

high frequency generator

Gas billiard balls

Gas display

Geometric transformations. Part I: movements

Geometric transformations. Part II: movements

Geometric solutions to non-geometric problems

The Giants

Global Resonances

Lightning rod, politics and... hats

Ten experiments from the golden fund of hydrodynamics

Detonometer

Diffraction of light by a circular hole

Differential geometry around us. (Comment - in the article Once again about surface curvature and thermal expansion)

Home computer. Zelenko G.V., Panov V.V., Popov S.N., 1989

Fractions-camels-parquets

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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

Electronic helmet for truck drivers 14.04.2024

Road safety, especially for drivers of heavy construction equipment, is a top priority for engineers and scientists. In light of this, the German Fraunhofer Institute for Structural Strength and System Reliability has introduced a new product - an electronic helmet, which is designed to protect drivers from serious injury when driving construction vehicles.

A new electronic helmet developed by a team of engineers from the Fraunhofer Institute opens up new prospects for the safety of truck and construction equipment drivers. The device is capable of monitoring the level of shaking in the car cabin and warning the driver of possible danger.

The basis of the helmet's operation is a built-in piezoelectric sensor, which generates electricity during physical deformation. This mechanism allows the device to respond to intense vibrations typical of construction equipment. When the level of deformation exceeds safe values, an alarm system on the helmet is activated to warn the driver.

This decision is especially important given that frequent body vibrations can lead to serious health problems such as injuries to the spine, eyes and even the brain. An electronic helmet allows you to effectively control the level of shaking and prevent such negative consequences for drivers.

Experts also note that such technologies can significantly improve road safety and improve working conditions for drivers of heavy construction equipment.

The electronic helmet presented by the German Fraunhofer Institute opens new horizons in the field of safety for drivers of construction equipment. Its ability to monitor vibration levels and warn of potential hazards makes it an important tool for ensuring road safety and protecting the health of drivers.

News feed of science and technology, new electronics

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▪ article Converting a computer power supply into a charger. Encyclopedia of radio electronics and electrical engineering

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