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Nanomechanical microchip sensor with ceramic coating

07.12.2021

The world's most accurate nanomechanical microchip sensor, combining nanotechnology and machine learning, was developed by researchers from TU Delft in the Netherlands. It will help to study dark matter, develop the quantum Internet, navigation and sounding.

Vibrating objects of the smallest size act in sensors or quantum equipment. It is very difficult to prevent them from interacting with ambient thermal noise. Sensors exist in a state of delicate balance, and even small interferences greatly affect their operation.

So, for example, a quantum computer can only work at temperatures around absolute zero (-273,15 °C). The necessary refrigeration equipment that provides such a temperature costs about half a million euros per copy. It is, of course, expensive. This sensor will allow you not to use refrigeration equipment.

Scientists have come up with a web-shaped microchip sensor that resonates well in noise isolation and operates at room temperature. The developers took an example from the device of the web, by the fluctuations of which the spider learns that the victim has already been caught. It is very good that hunting is not affected by the surrounding wind or various fluctuations outside. The authors believe that this is an ideal design that does not respond to external influences and is capable of creating isolated vibration.

Based on this analogy, the inventors created a microchip sensor by coating it with an ultra-thin nanometer-thick film of ceramic material.

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Astronomers from the University of Sydney have made an exciting discovery by detecting radio emission from an ultracold brown dwarf. This dwarf is a ball of gas that "boils" at a temperature of about 425 ° C without nuclear reactions. Usually such stars do not emit radio waves, so the reason for this phenomenon remains a mystery.

The star T8 Dwarf WISE J062309.94-045624.6 lies about 37 light-years from Earth. Its radius is from 0,65 to 0,95 of the radius of Jupiter, and the mass is 4-44 times the mass of the largest planet in the solar system (the exact value of the mass has not yet been determined). Even though this brown dwarf is not the coldest, astronomers have only observed radio emission from hotter stars so far.

Size comparison of various objects: Sun, low-mass star, brown dwarf, Jupiter, Earth. Brown dwarfs occupy an intermediate position between the smallest stars, where nuclear reactions of hydrogen take place, and large gas giants. Image: NASA/JPL

The emission of radio waves from stars is associated with the presence of strong magnetic fields. It is hypothesized that ultracold brown dwarfs do not have a fast enough rotational dynamic to generate strong magnetic fields that would be visible from Earth. However, about 10% of them still emit radio waves. Astrophysicists cannot yet explain the reason for this phenomenon.

One of the key hypotheses is that the fast rotation of ultracold brown dwarfs plays an important role in the formation of strong magnetic fields. When the magnetic field of such a star is intertwined with an atmosphere moving at a speed different from the ionized atmosphere, it can generate electrical currents. The emergence of electrons in the region of the star's magnetic pole, combined with its rotation, causes periodic flashes.

"Finding a brown dwarf that emits radio waves at such a low temperature is an important discovery," the authors of the study note. They believe that further observation of the properties of this star will help confirm the hypothesis or collect new data that explain the generation of a strong magnetic field in these cool stars.

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