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WINGED WORDS, PHRASEOLOGICAL UNITS
Directory / Winged words, phraseological units / General Frost

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

Winged words, phraseological units

Directory / Winged words, phraseological units

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General Frost

Napoleon I Bonaparte
Napoleon I Bonaparte

Phraseologism: General Frost.

Meaning: A synonym for attempts by former aggressors to justify their defeat in Russia with "objective" reasons.

Origin: From English: General Frost. For the first time this expression is found in England in 1812, when the Napoleonic army retreated from Russia, experiencing hardships from the onset of cold weather. On December 1, 1812, a satirical cartoon leaflet entitled "General Frost shaving little Boney" ("General Frost shaving litlle Boney") was published in London. Bony is a derogatory nickname for Napoleon Bonaparte in England. In 1853, on the eve of the Crimean War, the English comic magazine Punch again recalled this expression, turning it against the Russian Emperor Nicholas I. Thus, in the issue of March 10, he attributed to the tsar the words: "Russia has two generals she can rely on: these are Generals January and February. The expressions "General Frost", "General Winter" again became widespread during and after the Second World War: German generals thus tried to justify their defeats in Russia.

Random phraseology:

One, but fiery passion.

Meaning:

About a hobby (goal, interest), to which someone devotes all his time, all his strength.

Origin:

From the 3rd stanza of the poem "Mtsyri" (1840) by M. Yu. Lermontov (1814-1841). This is what the young man Mtsyri says about his desire to escape from the monastery, into which he fell against his will: "I knew only one thought power, / One, but a fiery passion: / She, like a worm, lived in me, / Gnawed my soul and burned."

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Electricity from mushrooms and wooden floor 01.04.2021

Wood consists of fibers of cellulose and hemicellulose polymers in a lignin matrix. Cellulose in the composition of wood can be amorphous and crystalline. The presence of the latter makes wood a piezoelectric material - a material in which electric charges arise under the action of deformation. When cellulose crystallites are compressed, the centers of gravity of positive and negative charges diverge in space, and charges arise on the surface of the crystallite to maintain electrostatic equilibrium. The piezoelectric properties of wood have been known since the fifties, but no one has made commercial materials and devices for generating electricity from it - due to the low piezoelectric modulus and the deformability of wood, this was considered unprofitable.

Swiss scientists led by Ingo Burgert from ETH Zurich managed to enhance the piezoelectric properties of wood. Burgert and his colleagues have long been able to change the properties of wood and obtain various functional materials on its basis. For example, last year they turned balsa wood into a luminous material by dissolving lignin and replacing it with a solution of luminescent quantum dots. To make wood a good piezoelectric, you also need to dissolve the lignin, then the wood will become looser, and it will be easier to deform it. In order to carry out the dissolution gently, without damaging the cellulose framework, Burgert and his colleagues proposed an unexpected solution - they treated the wood with mushrooms from the basidiomycete department.

The scientists again took the light wood of the balsa tree (Ochroma pyramidale) with a density of 94,8 kilograms per cubic meter as the basis for the material. Three types of fungi were used to dissolve lignin: Phanerochaete chrysosporium, Ganoderma adspersum, and Ganoderma applanatum. The wood was cut into thin plates, dried at a temperature of 100 degrees during the day, a freshly prepared mushroom culture was applied to the surface and left in a humid atmosphere for a period of 4 to 12 weeks.

To control how much lignin the fungi had time to absorb, wood samples were thoroughly cleaned and dried again for a day, and then weighed. The fastest loss of lignin was provided by the fungi Ganoderma applanatum. The optimal processing time Burgert and his colleagues considered eight weeks (corresponding to a weight loss of 45 percent mainly due to lignin) - with longer processing, the wood became too loose and significantly lost strength. Fourier IR spectroscopy confirmed that the fungi preferentially absorbed lignin, and a slight loss of hemicellulose was also observed. But the cellulose frame of wood remained practically unchanged after treatment - this was clearly visible not only in the IR spectra, but also in the images of scanning electron microscopy.

Lignin-free wood had better compressibility. As a result, the displacement of the centers of gravity of the charge in cellulose crystallites occurred with a greater amplitude, and the piezoelectric effect also increased. A cube of treated wood measuring 15 x 15 x 13,2 millimeters generated a voltage of 0,87 volts and a current of 13,3 nanoamps. This is fifty-five times more than unmodified wood under the same conditions. By connecting nine such cubes in series, the authors obtained electricity sufficient to power a light emitting diode.

From the new material, the authors propose to make a floor covering that will produce electricity under the weight of human steps. Such a coating could be placed in the homes of the elderly and powered by sensors that are activated if a person falls. There are more exotic ideas for using piezoelectric wood floors in dance and aerobics rooms. Note that so far Burgert and his colleagues have obtained a piezoelectric material only from balsa wood - light and with a large number of pores. In the future, they are going to adapt the method for denser and heavier types of wood.

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