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этимология

Что (кто) такое usable diamond - определение

RADIO TRANSMISSION TERM

Lowest usable frequency

Diamond simulant

DIAMOND-LIKE OBJECT WHICH IS NOT A DIAMOND

Diamond simulants; Diamond imitation; Diamond substitute; Diamond imitations; Imitation diamond; Paste diamond; DiamondAura; Faux diamond; Fake diamond; Simulated diamond; Diamond alternative; Imitation diamonds

A diamond simulant, diamond imitation or imitation diamond is an object or material with gemological characteristics similar to those of a diamond. Simulants are distinct from synthetic diamonds, which are actual diamonds exhibiting the same material properties as natural diamonds.

https://en.wikipedia.org/wiki/Diamond_simulant

Synthetic diamond

DIAMOND PRODUCED IN AN ARTIFICIAL PROCESS, AS OPPOSED TO NATURAL DIAMONDS, WHICH ARE CREATED BY GEOLOGICAL PROCESSES

Man-made dimond; Man-made diamond; Artificial diamond; Manufactured diamond; Cultured diamond; Atrificial diamond; DiamondView; Diamondview; Diamond view; Diamond View; Diamond synthesis; CVD diamond; Cultured diamonds; Synthetic diamonds; Lab created diamond; Polycrystalline diamond; Artificial Diamond; Laboratory grown diamond; Laboratory-grown diamond; Lab-grown diamond; HPHT; Lab-created diamond; HPHT diamond; Man made diamonds; Man made diamond; Artificial diamonds; Grown Diamond; Manmade diamond; Laboratory-created diamond; Laboratory created diamond; Laboratory-grown diamonds; Laboratory grown diamonds; Laboratory-created diamonds; Lab-made diamond; Lab grown diamonds; Artisan Created Diamond; Artisan Diamond; Human-made diamond; Artisan created diamond; Artisan-created diamond; HPHT diamonds; CVD diamonds

Lab grown diamond (LGD, also called laboratory-grown, laboratory-created, man-made, artisan created, or cultured diamond) is diamond that is produced in a controlled technological process (in contrast to naturally formed diamond, which is created through geological processes and obtained by mining). Unlike diamond simulants (imitations of diamond made of superficially-similar non-diamond materials), synthetic diamonds are composed of the same material as naturally formed diamonds – pure carbon crystallized in an isotropic 3D form – and share identical chemical and physical properties.

https://en.wikipedia.org/wiki/Synthetic_diamond

Diamond model

Porter's diamond model; Porter’s Diamond Model; National Diamond

Within international business, the diamond model, also known as Porter's Diamond or the Porter Diamond Theory of National Advantage, describes a nation's competitive advantage in the international market. In this model, four attributes are taken into consideration: factor conditions, demand conditions, related and supporting industries, and firm strategy, structure, and rivalry.

https://en.wikipedia.org/wiki/Diamond_model

Википедия

Lowest usable high frequency

The lowest usable high frequency (LUF), in radio transmission, is a frequency in the HF band at which the received field intensity is sufficient to provide the required signal-to-noise ratio for a specified time period, e.g., 0100 to 0200 UTC, on 90% of the undisturbed days of the month. Any frequency lower than this is not able to fulfill those requirements, while higher frequencies usually yield better result until the maximum usable frequency is reached. The amount of energy absorbed by the lower regions of the ionosphere (D region, primarily) directly impacts the LUF.

https://en.wikipedia.org/wiki/Lowest usable high frequency