Free books, magazines, collections published in 1985

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FREE TECH LIBRARY
Content of books and magazines / Year 1985

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40 years of the Great Victory

VII Moscow Tournament of Young Physicists

VIII Moscow Tournament of Young Physicists

XI All-Russian Olympiad for schoolchildren

XIX All-Union Olympiad in Mathematics

XIX All-Union Physics Olympiad

XVI International Physics Olympiad

XXVI International Mathematical Olympiad

Algorithmic language

Antenna amplifier UHF

Arithmetic of Gaussian numbers

African puzzle

Running in circles and a long story

Hysteresis-free magnetic DC converters. Malina A.K., 1984

Crazy Tea Party

Whiteout, or Do not believe your eyes

Non-contact limit switches. Vilensky P.I., Sribner L.A., 1985

Trenchless laying of power cables. Boyazny Ya.M., 1985

Bill flies out the chimney

Block of RAM for 4096 bits

Bratislava Summer School for Young Programmers

Introduction to solid geometry, or Axiomatic games

Vectors in Geometric Problems

Hanging bridges

Volna

Voltmeter-indicator of the onboard network of the car

Issues of designing diagnostic systems. Mozgalevsky A.V., Koida A.N., 1985

TV Test Signal Generator

Fixed Frequency Signal Generator

Sliding Vector Geometry

city radio

Loudspeaker for amateur radio complex

Contact resistance sensors. Katsnelson A.Sh., 1985

Two phrases by Niels Bohr

Two-zone tracking systems, 1984

Day of Soviet Science

Diophantine equation

13 more proofs of the bisector theorem, about Lagrange's theorem

Another type of radioactivity

Eight point problem

Queen dominance problem

Problems M901-905, F913-917 and solving problems M884, M885, F894-897

Problems M906-910, F918-922 and solving problems M866-890, F898-902

Problems M911-915, F923-927 and solving problems M891-895, F903-907

Problems M916-920, F928-932 and solving problems M896-900, F908-912

Problems M921-925, F933-937 and solving problems M901-904, F913-916

Problems M926-930, F938-942 and solving problems M905-910, F917-922

Problems M931-935, F943-947 and solving problems M911-915, F923-926

Problems M936-940, F948-952 and solving problems M916-920, F927-932

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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

Growth of the precision farming market 31.10.2014

According to Marketsand Markets, between 2014 and 2020. the average annual growth rate (CAGR) of the precision farming market, which is based on Earth remote sensing (ERS) technologies, will be 12,2%. By 2020, its volume will reach $4,55 billion.

Analysts at Marketsand Markets predict that the precision farming market will reach $2020 billion by 4,55. Between 2014 and 2020. it will grow by an average of 12,2% per year.

Precision farming methods are based on land yield monitoring applications, soil monitoring technologies, crop exploration, intelligent fertilizer systems, robots, irrigation system control systems, etc.

Growing demand for food is forcing farmers to embrace new technologies such as cloud GIS, drones and satellite monitoring. This reduces costs and improves work efficiency.

The Marketsand Markets report notes that the most intensive growth of the precision farming market is expected in the Asia-Pacific region, where the population is growing most rapidly. Also, the introduction of geoinformation technologies for agriculture is actively developing in North America.

While the North American market is growing thanks to the renewal of the technological basis of agriculture, in Asia, South America and Europe strong growth is driven by the introduction of innovations in the early stages of the life cycle. In particular, the regional markets of Brazil, Argentina, some countries in Eastern Europe and China are experiencing double-digit growth due to the introduction of the latest geospatial technologies such as Farm Management Systems (FMS).

The basis for the development of the precision farming market is the desire of farmers to reduce costs and receive additional income. Government support programs that are aimed at increasing the production of strategically important food raw materials contribute to the growth of the market. At the same time, according to Marketsand Markets experts, the main problems of the market are related to the high cost of initial investments in geoinformation technologies for precision agriculture. Many farmers, already limited in funds due to the seasonal nature and high risk of doing agricultural business, have nowhere to get funds for the introduction of innovative technologies. In addition, agricultural workers often lack the information and knowledge to find, deploy and operate the systems they need.

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Low frequency amplifiers. Article selection

▪ article How to work with rhythm in editing. video art

▪ article What is written in hieroglyphs? Detailed answer

▪ article Operator on automatic and semi-automatic lines in woodworking, engaged in the processing of bars. Standard instruction on labor protection

▪ article Encoder and decoder for the security alarm radio channel. Encyclopedia of radio electronics and electrical engineering

▪ article Experiments with enzymes: amylases. Chemical experience

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