Free books, magazines, collections published in 1971

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Content of books and magazines / Year 1971

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100 questions and answers on an amateur record. Samodurov D.V., 1971

IV International Physics Olympiad for schoolchildren

V All-Union Mathematical Olympiad

V All-Union Physics Olympiad

V city scientific conference of schoolchildren in Kyiv

V International Physics Olympiad for schoolchildren

XII International Mathematical Olympiad for schoolchildren

Self-oscillating magnetic transistor sensors and relays. Leiman A.A., 1971

Automatic oscilloscopes for measurements. Lint G.E., 1971

Automatic inclusion of a reserve. Levchenko M.T., Khomyakov M.N., 1971

Automatic continuous dosing of gases. Vidineev Yu.D., 1970

Archimedes and the quadrature of the parabola

Diodeless magnetic logic circuits. Germ E.I., 1971

Railless transportation of transformers. Sklyarov P.V., 1971

Discussion on the Uncertainty Principle

Contactless travel switches in industrial automation. Ivensky Yu.N., 1971

Non-contact elements of automation. Arkhiptsev Yu.F., 1971

Glitter in nature, or Why does a cat's eyes glow?

Storm against storms

Household video recorders. Lazarev V.I., Lishin L.G., Parkhomenko V.I., 1971

Great law

Interaction of atoms and molecules

vortex rings

Air helps to automate. Ferner W., 1971

Waves in a shallow dish (interference)

Physics questions

Impressions of the participant of the Olympiad

Rotational motion of bodies

Is our eye always right?

Auxiliary circle

Selection of semiconductor valves for electric drives. Preobrazhensky V.I., 1971

High quality bass amplifier

The high-frequency part of the diffuse protections. Kuznetsov F.D., 1971

Computing machines and number systems

Tunnel diode generators. Smirnov V.V., 1971

Geoacoustic exploration of underwater mineral deposits

Potential Energy Plot

Graphs in problems for uniform processes

Loudspeakers and their applications. Ephrussi M.M., 1971

Two weighings. Encryption

Two dozen tasks on progression

Two tasks

Two games with matches

The movement of comets and the discovery of the atomic nucleus

planetary motion

The effect of electric current on a person and first aid to victims. Dolin P.A., 1971

Demonstration of the orbits of bodies moving under the influence of central gravity

Details of miniature radio equipment. Roginsky V.Yu., 1971

Children's electronic machine ADE-2

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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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Random news from the Archive

Drought-resistant rice genes found 07.07.2022

Chinese scientists have discovered two genes in rice that could make China's mainstream crop more heat-tolerant, providing a new way to breed highly heat-tolerant crops.

Researchers from the Shanghai Institute of Plant Physiology and Ecology of the Chinese Academy of Sciences and Shanghai Jiao Tong University have uncovered the mechanism by which the rice cell membrane senses external heat stress signals before binding to chloroplasts. This is the organ where photosynthesis takes place to provide resistance to heat.

Too high a temperature can damage the plant's chloroplasts. When the temperature exceeds the normal tolerance of a crop, its yield tends to decrease.

Specialists identified a locus with two genes: Thermo-tolerance 3.1 (TT3.1) and Thermo-tolerance 3.2 (TT3.2). They interact with each other to increase the heat tolerance of rice and reduce grain yield losses caused by heat stress.

Scientists have found that accumulation of TT3.2 causes damage to chloroplasts due to heat stress, but in this case, TT3.1 can serve as a drug.

Under heat stress, TT3.1, a potential thermosensor, will remove the cell membrane from the cell to cleave mature TT3.2 proteins, according to a study published in the journal Science.

"The study reveals a new molecular mechanism that binds plant cell membranes to chloroplasts in response to heat signals," said co-author Lin Hongxuan of the Shanghai Institute of Plant Physiology and Ecology.

The researchers then used hybridization to translate the African rice TT3 locus into Asian species.

Field tests have shown that the new species is more resistant to heat. According to the researchers, it can withstand temperatures up to 38 degrees Celsius without loss of yield, while the output of common species is reduced at temperatures above 35 degrees Celsius.

The newly discovered gene could also be used in other plants, including wheat, corn, beans and vegetables, to grow heat-tolerant strains, the researchers said.

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