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Occupational Safety and Health



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Latest news of science and technology, new electronics:

Blinking of the magician and his audience 19.05.2024

Magic and illusions have always captured the attention of the public, but what happens behind the scenes of the magician and in the brains of his audience? Scientists from the UK decided to solve this mystery by conducting a new study involving ten illusionists of varying experience. Illusionists, some of whom had been practicing magic for more than half a century, others for only six months, were invited to demonstrate the same trick - the popular coin trick. Recordings of their performances during training and on stage showed that each of them began to blink significantly more often at the moment of performing the trick. The study's findings indicate that magicians' blink rate may be related to unconscious aspects of their performance. At the same time, as scientists have found, spectators also begin to blink more often, following the movements of the illusionist. This observation supports the idea that magicians may be catalysts for blinking in audiences. Additional research has shown that magicians blink more often during ... >>

Ultrasonic coffee machine 19.05.2024

Iced coffee has become an integral part of coffee culture in recent years. Therefore, engineers from the University of New South Wales decided to improve its preparation. They have developed an ultrasonic coffee machine that reduces the cold brew time for ground coffee beans from 12-24 hours to significantly less time. Iced coffee, or "Cold brew", is popular due to its smoothness, low acidity and low bitterness. It is prepared by steeping ground coffee in cold water for a long time. Unlike traditional hot brewing, which often imparts bitterness to coffee, cold brewing extracts more delicate and complex flavors from the coffee beans. The innovative system, presented by a team of engineers, introduces ultrasonic technology into the coffee preparation process. The system uses ultrasonic waves to speed up the process of extracting oils, flavor and aroma from ground coffee. This allows you to significantly reduce the time ... >>

The speech of sperm whales is similar to that of humans 18.05.2024

In the world of the ocean, where the mysterious and unknown coexists with the studied, sperm whales, with their huge brains, are of particular interest to science. Researchers, working with a huge array of audio recordings collected during the Dominica Sperm Whale Project (DSWP) - more than 8000 recordings, seek to unravel the secrets of their communication and understand the structure and complexity of the language of these mysterious creatures. By studying in detail the recordings of 60 sperm whales in the eastern Caribbean, scientists have revealed surprising features of their communication, revealing the complexity of their language. "Our observations indicate that these whales have a highly developed combinatorial communication system, including rubato and ornaments, which indicates their ability to quickly adapt and vary during communication. Despite significant differences in evolution, sperm whales have elements in their communication that are characteristic of human communication," says Shane Gero, a biologist at Carleton University and director of the CETI project. Issl ... >>

Random news from the Archive

A hybrid of atomic clocks and ultra-precise scales 18.01.2013

Physicists have created a new kind of atomic clock based on the cesium atom, which can be used not only as a chronometer and time standard, but also as ultra-precise scales, which will allow in the near future to link mass and time standards, according to an article published in the journal Science.

"The accuracy of our clocks exceeds seven parts per billion. This error corresponds to a shift of one second in eight years, which is approximately equal to the accuracy of the first cesium-based atomic clocks created 60 years ago. (On the other hand), these clocks, in combination with the best Avogadro's spheres will help us redefine the kilogram. The tick frequency in our clock is equivalent to the mass of a single atom, and knowing it, we can calculate the mass of the entire sample," said team leader Holger Mueller of the University of California at Berkeley. (USA).

As physicists explain, atoms and electrons are not only microparticles, but also waves. Because of this, they have the same properties as electromagnetic waves, including frequency and amplitude. The natural frequency of oscillations of atoms is called Compton, in honor of the American physicist Arthur Compton, one of the pioneers of quantum mechanics.

According to the authors of the article, the difficulties in measuring and observing such oscillations made their practical use as a "metronome" or clock impossible. Muller's group was able to overcome these difficulties by using the well-known "twin paradox". According to this paradox, time will flow more slowly for objects traveling at a sufficiently high speed. Thanks to this, a person who has traveled to a distant star and returned back will be younger than his twin brother on Earth.

The authors of the article adapted this phenomenon to measure the frequency of vibrations of cesium atoms. In their experimental clock there are two "twin" atoms. One of them is at rest, and the second one moves through the tank at high speed. Due to this, the number of vibrations that both atoms will make per unit time will differ markedly. Their behavior is monitored by a special device - an atomic interferometer, the readings of which are processed using a special computer algorithm. This program compares the images that appear after collisions of a laser beam and cesium atoms on the interferometer sensors and calculates the Compton frequency of one of them.

Since this frequency is constant and depends only on the mass of the particle, it can be used as the basis for ultra-precise clocks. The first prototype of atomic clocks by Muller and his colleagues is not a champion in accuracy - it is about 100 million times inferior to the best analogues based on other technologies. On the other hand, such watches can be used for completely different purposes, the most attractive and promising of which is the creation of a new mass standard. As Muller explains, by measuring the exact value of the Compton frequency, you can measure the mass of a particle, which will allow you to accurately determine the value of the kilogram and associate it with the second.

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