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Winged words, phraseological units. Meaning, history of origin, examples of use

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Everything has its limits

Quintus Horace Flaccus

Phraseologism: Everything has its limits.

Meaning: A call to be respectful.

Origin: From Latin: Est modus in rebus. From the 1st satire of the first book of the Roman poet Horace (Quintus Horace Flaccus, 65-8 BC): "Est modus in rebus, sunt certi denique fines // Quos ultra citraqe nequit consistere verum". In the original: Everything has its limits, beyond which truth cannot exist.

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Random news from the Archive Volitronics Success 13.04.2016 Physicists have learned how to generate and control electrons in the valleys of two-dimensional semiconductors. In recent decades, researchers from different countries have been actively looking for a replacement for traditional electronics based on the use of an electron charge. They seek to reduce the power consumption and heat generation of electronic devices due to the flow of electric currents and increase their speed. The most well-known alternative direction is spintronics, which uses one more property of electrons - spin. Much less known is another area of ​​research - volleytronics (valleytronics). It is based on the fact that some semiconductors have several minima of the allowed energy of conduction electrons (in the language of band theory - minima of the conduction band), which physicists call valleys. The English name valleytronics is formed similarly to spintronics from two words valley (valley) and electronics (electronics). The presence of such valleys makes it possible to encode information by placing an electron in one of them. In combination with the spin, this allows you to significantly expand the possibilities of encoding information in devices. Separately, two spin values ​​or two valleys correspond to one bit of information - they can be compared with 0 and 1. But two valleys, in which the electron spins can take on different values, are a two-bit construction encoding already four values. And if you add a charge, then you can encode eight values. Like spintronics, volitronics promises faster response times, higher noise immunity, and lower power consumption. However, the creation of such devices in practice is hindered by the difficulty of managing electrons to place them in valleys and control them there. Researchers in the United States and China reported that for the first time they were able to generate and control electrons in the valleys of a two-dimensional semiconductor, which is a layer of transition metal dichalcogenide (TMDC). To do this, they used the electrical transfer (injection) of his spin from an attached ferromagnetic semiconductor. Most importantly, they managed to place charge carriers in only one of the two valleys. Thanks to the phenomenon of electroluminescence, the valleys then emitted polarized light with different circular polarizations, observing which physicists were convinced of the success of the operation.

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