Free books, magazines, collections published in 1992

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FREE TECH LIBRARY
Content of books and magazines / Year 1992

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AM receiver with single-sideband reception capability

B3MLU announces acceptance

CW key-machine on CMOS chips

FOND EDIT

In vino veritas

IV All-Russian Olympiad in Informatics

IV International Olympiad in Informatics

JUNGLE JOB, or new technical principles for the design of compact beams

LOG YAGI at 14 MHz

MULTI BAND antenna

PARKS

Per funicula ad astra. D. Jones, Inventions of Daedalus

Primus means first. Digital frequency synthesizer

RC generator on K157DA1

RYRYRY - sequence on BK-0010

SSTV based ZX computer

TURBO - no problem

XV Moscow Economics and Mathematics Olympiad

XVIII All-Russian Olympiad in Mathematics and Physics

XXIII International Physics Olympiad

XXVI Inter-Republican Olympiad in Mathematics

XXVI Inter-Republican Olympiad in Physics

XXXII All-Ukrainian Mathematical Olympiad

XXXIII International Mathematical Olympiad

Z-AMTOR - the best AMTOR controller

ZX Spectrum 128K - what is it?

ZX.25 and HF bands

But what if you darn it carefully?

August

Aircraft manufacturers to surgeons

Phase-locked oscillator

Automatic battery charger

Caller

Vibration pump control machine

Staircase lighting control

TV circuit breaker with simplified connection

Automatic light switch

Automatic transition from reception to transmission in the RK-86 computer

Automatic timer for washing machine

Car on the third floor

The car does not end up in a landfill

AMTOR - the successor of the teletype

AMTOR: exchange protocol

Caller ID - version 26. Description of service capabilities. Firmware firmware

FET AGC

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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

Miniature infrared spectrometer 19.10.2019

Researchers at the Swiss Federal Institute of Technology (ETH) have created a tiny infrared spectrometer that is small enough to fit on a semiconductor chip and yet "provides a lot of interesting possibilities." According to the researchers, chips with such spectrometers can be used in a variety of areas, from the space industry to everyday items. One example of this is the integration into the design of mobile phones.

With the help of an infrared spectrometer in a smartphone and a special application, this device becomes able to determine the alcohol content in a liquid, conduct a simple chemical analysis of a substance, determine the degree of maturity of fruits and vegetables, and perform a number of other functions that will be useful to people of various professions.

The main achievement in all this is the extremely small size of the spectrometer. Conventional infrared spectrometers currently used for analysis are expensive and bulky devices weighing at least a few kilograms and extremely difficult to convert into portable devices.

A conventional spectrometer splits light into two streams, which are reflected from mirrors, added again in a certain way, and the result is measured by a sensitive photosensor. By changing the position of one of the mirrors, it is possible to change the optical image resulting from the addition of two beams of light, which makes it possible to determine the proportion of the content of light with different wavelengths in the incoming optical signal.

The miniature spectrometer uses exactly the same principle. Only instead of movable mirrors, it uses special waveguides, the light refractive index of which can be changed using an external electric field. Changing the refractive index in this case has the same effect, similar to the effect of changing the position of the mirror.

In addition, by changing the refractive indices of two waveguides at once, using a miniature spectrometer, you can work with different parts of the infrared range. Another undoubted advantage of this device is that it needs a one-time calibration, which can be carried out at the manufacturer immediately after the chip is manufactured or the chip is integrated into the final device. In contrast, conventional spectrometers require calibration before each run.

The design of the new miniature infrared spectrometer has no moving parts, making it extremely reliable. But, as the researchers themselves admit, before their offspring can be used in mobile devices, they will need to carry out a number of works aimed at improving technologies and bringing these technologies into line with the requirements of modern industrial production.

News feed of science and technology, new electronics

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