Free books, magazines, collections published in 1987

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Content of books and magazines / Year 1987

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I All-Union Olympiad for Schoolchildren in Informatics

II Scientific and technical conference of schoolchildren in MIPT

VIII Moscow Programming Olympiad

X tournament of young physicists

XIII All-Russian Olympiad for schoolchildren

XVIII International Physics Olympiad

XXI All-Union Olympiad in Mathematics

XXI All-Union Physics Olympiad

XXVIII International Mathematical Olympiad

Acoustics in the ocean

Analytical design of stationary control systems. Zotov M.G., 1987

Andrey Nikolaevich Kolmogorov

Antiproton in a trap

Elliptic Curve Arithmetic

White dwarfs - crystalline stars

RTTY Signal Processing Unit

The block of formation of signs on the oscilloscope screen

Block receiver for a beginner radio amateur. Borisov V.G., 1987

In search of the optimal cutting

To help the radio club. Ivanov B.S., 1987

Van der Waals and his equation. (To the 150th anniversary of the birth of the scientist)

Automatic charger option

Introduction to digital technology. Partin A.S., Borisov V.G., 1987

The Great Book of Newton. (To the 300th anniversary of the first edition of the Mathematical Principles of Natural Philosophy)

News from exams. Teaching is light, but ...

Weighing filter

Whirlwinds... on the gramophone

waves in the heart

Waves on the water

Time to create, time to dare!

All, some and denial

National holiday

The meeting with Halley's comet took place!

Kepler's second law and the topology of abelian integrals (according to Newton)

The choice of equipment for testing electrical equipment. Bazhanov S.A., 1987

Choosing the best option

Switch instead of ... generator

The circumscribed circle helps out, extra conditions in competitive problems

High quality economical power amplifier

Calculating distances and angles

Viscous friction, electrostatic imaging, nuclear spectra

Pascal's hexagrams and cubic curves. (Solution of problem M535)

family trees

Low distortion 3H generator

Stable microcurrent generators based on silicon bipolar transistors

Dalton weighs the atoms

Bipolar power supply

Dispatch station of the district of distribution networks. Andrievsky E.N., 1987

Diffraction grating - 200 years

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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 ... >>

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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

Food from insects will create waste-free agriculture 20.03.2022

Insects are an excellent source of protein, requiring significantly fewer resources to produce compared to conventional agriculture. If a mealworm farm is given 2 kg of food, you can get a kilogram of edible protein. In the production of beef, the efficiency is incomparably lower, and greenhouse gases are also emitted.

The production of insects for food and feed usually results in two by-products: insect exuvia and a kind of "meal". Exuviae are exoskeletons left over from insect moulting, and insect meal is mostly excrement and uneaten food. These two by-products could be potential alternatives to conventional fertilizers and pesticides.

Scientists from Wageningen University in the Netherlands analyzed the possibility of producing food for humans and animals from insect by-products. In addition, these by-products can provide farmers with an organic soil supplement.

An important component of insect exuvia is chitin, a high molecular weight aminosaccharide polysaccharide, which is also present in the cell walls of fungi and the exoskeleton of many crustaceans. Chitin-containing soil additives have been shown to promote plant growth.

Adding insect meal to the soil can promote plant growth - insect feces are rich in nitrogen, a nutrient that is critical for plant growth but is often deficient in soil. Nitrogen is often added to the soil as a synthetic fertilizer.

The use of by-products of insect breeding in agriculture can be a step towards a kind of cycle in food production, when the waste is completely utilized in the process itself. First, the insects are fed with crop or food waste, then the insects provide food for humans and meat products, and finally the insect waste is used to stimulate crop growth.

News feed of science and technology, new electronics

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