Ursula Le Guin. The most famous aphorisms

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APHORISMS OF FAMOUS PEOPLE
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Aphorisms of famous people. Ursula Le Guin

Aphorisms of famous people

Free library / Aphorisms of famous people

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Ursula Le Guin. The most famous aphorisms

If civilization has an opposite, it is war.
The end of the road justifies the means. But what if there is no end and never will be? In that case, we only have the means.
Love, like bread, is baked anew every day.
Freedom is not a thing that can be owned or kept to oneself. This is human activity, this is life itself!
To know if there is a choice means to make a choice. Change or stay the same: like a river or like a rock.

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Flash Memory Made from Organic Materials 10.11.2014

The Japanese Institute of Physical and Chemical Research RIKEN experimentally proved the possibility of creating a high-density non-volatile memory based on organic materials. "Organic" is used in electronic circuits is not the first time. Many have heard of Samsung's AMOLED displays and simply OLED displays. Also, transistors based on organic materials are used in the production of advanced solar panels.

But one more effect of organic materials is known - photochromic, which has not yet found wide application in electronics (chameleon glasses do not count). This effect lies in the fact that under the influence of ultraviolet radiation, molecules from certain compounds become colored from transparent: yellow, blue, red. This effect is reversible - irradiation with a visible light source returns transparency to the molecules. As long as the re-exposure has not occurred, the color change of the molecules does not occur - they retain their state without the obligatory support of nutrition (without illumination). Why not memory?

The effect of photochromism has been studied for a long time. The main task was to develop a technology that could turn the "broth" of the chemical composition of dissimilar substances into an ordered structure, similar to an array of SRAM or DRAM. In this case, the molecules must reproduce the semblance of a memory array on something suitable for the further creation of an electronic circuit. For example - on a copper substrate.

At the RIKEN Institute, based on the chemical mechanisms of self-assembly of molecular structures from diarylethylene derivatives, they created a similar technology and proved its efficiency in practice. On the slide below, on the right, you can see a model of an ordered molecular assembly of repeating elements, and on the right, an image of a real sample made using a scanning tunneling microscope.

According to the developers, the molecular structure allows you to record data with a density of over 1 Tbit/square inch. This is higher than the recording capability of traditional means. True, while RIKEN technology leaves the laboratory, modern technologies can advance far and it is not yet certain which of them will be truly breakthrough.

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