Free books, magazines, collections published in 1990

Free technical library

FREE TECH LIBRARY
Content of books and magazines / Year 1990

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II International Olympiad in Informatics

III All-Union Olympiad in Informatics

III Correspondence Aerospace Olympiad

V scientific and technical conference of schoolchildren

XVI All-Russian Olympiad for schoolchildren

XVII International Physics Olympiad

XXIV All-Union Olympiad in Mathematics

XXIV All-Union Physics Olympiad

XXXI International Mathematical Olympiad

Light effects machine

Automatic lighting effects on PROM

Automatic means for measuring the volume, level and porosity of materials. Mozhegov N.A., 1990

Adaptive photoelectric converters with microprocessors. Pustynsky, I.N., 1990

Analog frequency meter with automatic range selection

Anodizing aluminum parts

Anthropic principle - what is it?

Arithmetic word problems on a competitive exam

Big and small on a walk

In the role of Magdeburg burgomaster

Variations on a Theme by Escher

Introduction to practical informatics. Stepanov B.G., 1990

Together to Mars! KVM-91 Organizing Committee

Waves on the water and overseas guests of N. Roerich

rotating fluid

All-Union Correspondence Physics and Mathematics Olympiad of the Moscow State Technical University named after N.E. Bauman

All-Union Competition Young Programmer

Switches and measuring transformers in switchgear 6-220 kV. Doroshev K.I., 1990

Buoyancy force

Calculate or guess - choose for yourself!

Gas laws and mechanical equilibrium

PAL Signal Generator Rainbow

Geometric progression

Geometry or analysis?

Color Triangle Puzzle

City of discoveries and creativity

Lady with a dog

Movement - no?

Moving toys made of cardboard and paper

Diodes. Directory. Grigoriev O.P., 1990

Diffraction in laser light

Differential protection of transformers with relay type DZT-21 (DZT-23). Golantsov E.B., Molchanov V.V., 1990

More about Pascal's Law

Once again about surface curvature and thermal expansion

Once again about the difficult task

The problem of oncoming trains. On the reversibility of time

The Chebyshev problem and trigonometric polynomials

Problems of the LIII Moscow Mathematical Olympiad

Tasks of the Leningrad City Olympiad in Mathematics

Problems M1201-1205, F1208-1212 and solving problems M1176-1180, F1188-1192

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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

The first wooden satellite will be sent into space 15.06.2021

The world's first wooden satellite will be launched into space this year. The WISA Woodsat satellite measures approximately 10x10x10 cm and weighs approximately 1 kg. It is made of birch plywood with a special coating (WISA). The device is powered by nine small solar panels.

The wooden satellite will be launched as part of a mission developed by the Finnish company Arctic Astronautics, which makes cubesat kits for students. It will be launched into polar orbit by the Electron Rocket Lab rocket in November of this year. The purpose of the mission is to test the behavior and durability of plywood panels in extreme space conditions and evaluate their suitability for future missions.

The satellite will be equipped with two cameras, one of which will be attached to a metal selfie stick, allowing the mission team to observe how the surface of the satellite's plywood changes in the space environment.

"The base for plywood is birch, and we use basically the same stuff you find at a hardware store or for making furniture. Regular plywood is too wet to use in space, so we put our wood in a thermal vacuum chamber to dry it first. Then we apply molecular layering by adding a very thin layer of alumina, which is often used to encapsulate electronics," explained Woodsat chief engineer Samuli Nyman.

On June 12, the prototype satellite was launched into the stratosphere to a height of 31,2 km. The flight lasted 2 hours 54 minutes.

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Measuring equipment. Article selection

▪ article Hard to learn, easy to fight. Popular expression

▪ article Which animals hibernate immediately after birth? Detailed answer

▪ shark knot article. Tourist tips

▪ Article Means for simultaneous bleaching and washing. Simple recipes and tips

▪ article VHF super-regenerator with a loop antenna. Encyclopedia of radio electronics and electrical engineering

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