A magnetic field affects graphene in an unusual way. Free Technical Library News

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The magnetic field affects graphene in an unusual way

24.03.2020

Graphene is a very unusual and promising material in every sense, which has managed to gain fame in almost any field related to scientific research. And yet, specialists continue to discover more and more of its new and interesting properties - as was done, for example, by specialists from the Zurich Polytechnic Institute. This is a joint project of chemical engineering professors Jose Lado and Alin Ramirez, who found that two layers of graphene stacked in a special way can be used to obtain a superconducting material - which is quite an interesting result, given previous studies in this direction, which clearly spoke of the need control the bending of graphene.

However, a new study is connected precisely with this moment - experts have found that if you connect two sheets of graphene, but at the same time change the bend of one of them so that their matrix grids do not exactly match, then when exposed to an electric field, it generates an effect similar to the one that occurs when they are in full contact and combination - however, the final exponential conductivity increases significantly.

Such a curious behavior of this double graphene system is of great interest to scientists, especially in the context of amplification of external electromagnetic influence. The artificial field created in this way becomes powerful enough to serve as an additional source for creating a state of superconductivity, which is far from available for all materials and systems of this kind - such a result can be potentially useful for applications in the field of applied robotics and artificial intelligence.

However, experts note that the generation of such a high superconductivity index also generates some instability in the process - which makes it necessary to additionally stabilize it. And, from the point of view of experts, this can be corrected by manipulating the matrix grid of graphene layers itself, turning and bending which, you can adjust the ideal energy balance.

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Waves of sand obey the laws of mathematics 19.01.2022

Sand waves with a wavelength of 30 centimeters to several meters are known as mega ripples: they are in size between the usual beach ripples and full-fledged dunes.

In addition to their size, a key characteristic of megaripples is the arrangement of grains - large particles are always on top of small ones. This mixture is never the same, just like the winds that blow across the sand to create ripples. However, an international team of scientists has discovered an amazing mathematical feature of the megaripple: the ratio of the diameter of the largest particles to the diameter of the smallest is always constant.

Specimens have been studied from megaripple fields in Israel, China, Namibia, India, Jordan, Antarctica, and New Mexico in the United States. Further analysis was supplemented by observations made on Mars and the results of an experiment in a laboratory wind tunnel. "An extensive collection of terrestrial and extraterrestrial data, covering a wide range of geographic sources and environmental conditions, confirms the accuracy and reliability of this unexpected theoretical discovery," the researchers write.

The authors of the study conclude that in the future, this number can be used to classify different types of waves and what processes formed them.

The calculations can also be used to study past weather and climate patterns based on the sediments left behind by previous megaripples.

The results are even applicable beyond Earth: they could give us a better understanding of how megaripples are created on planets like Mars and what atmospheric conditions are needed for them to form, rather than other types of sand waves.

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