Herbert George Wells. The most famous aphorisms

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APHORISMS OF FAMOUS PEOPLE
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Aphorisms of famous people. Herbert George Wells

Aphorisms of famous people

Free library / Aphorisms of famous people

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Herbert George Wells. The most famous aphorisms

The history of mankind is basically the history of ideas.
Moral indignation is envy with a halo around the head.
Reasonable is the opposite of great.
Advertising is a legalized lie.
Where there is no change and no need for change, the mind perishes.
Cynicism is humor in a bad mood.

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Magnetic system that converts heat into mechanical motion 16.11.2017

Researchers at the University of Exeter have created a microscopic magnetic system that is capable of producing mechanical motion using thermal energy from the environment. This new principle of direct conversion of energy from one type to another can be used to ensure the operation of various nanomachines, microrobots, and the operation of new types of sensors and next-generation information storage devices can be based on this principle.

The basis of the new magnetic system is a fairly common mechanism known as the "ratchet". This thermal ratchet is made of a very unusual material, which can be called the term "artificial spin ice" (artificial spin ice), which includes a lot of tiny nanomagnets, nanoparticles of their permalloy alloy, an iron-nickel alloy.

In addition to thermal energy, such a system is capable of converting into motion the energy of a magnetic field, which leads to a shift in the magnetization vectors of individual nanomagnets. In this case, this displacement has an annular character and rotates in one of two possible directions. “We tried to figure out why it works at all for a long time,” says Professor Gino Hrkac, “And only at the very end we realized that an asymmetric energy potential is created at the opposite edges of the thermal ratchet, which is reflected in the distribution of the total magnetic field of the set nanomagnets. And this asymmetry causes the region of magnetization to rotate in one of two directions."

To study the characteristics of the magnetic state of a thermal ratchet, scientists used X-rays and the so-called dichroic magnetic effect (magnetic dichroic effect). And the actual measurements were made using the SLS X-ray source of the Paul Scherrer Institute, Switzerland, and the Advanced Light Source of the Lawrence Berkeley National Laboratory, USA.

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