Şərəfə

Şərəfə (also, Sərəfə and Sharafa) is a village and municipality in the Masally Rayon of Azerbaijan. It has a population of 2,154.

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Radio frequency

Radio frequency (RF) is any of the electromagnetic wave frequencies that lie in the range extending from around 7003300000000000000♠3 kHz to 7011300000000000000♠300 GHz, which include those frequencies used for communications or radar signals. RF usually refers to electrical rather than mechanical oscillations. However, mechanical RF systems do exist (see mechanical filter and RF MEMS).

Although radio frequency is a rate of oscillation, the term "radio frequency" or its abbreviation "RF" are used as a synonym for radio – i.e., to describe the use of wireless communication, as opposed to communication via electric wires. Examples include:

Special properties of RF current

Electric currents that oscillate at radio frequencies have special properties not shared by direct current or alternating current of lower frequencies.

Leonhard Fredrik Rääf

Leonhard Fredrik Rääf (1786 – 1872) also known as Ydredrotten was a Swedish folklorist, local historian and conservative politician from Ydre. During a time Rääf had a literary saloon in Tomestorp which was frequented by among others Per Daniel Amadeus Atterbom. In 1843 Rääf moved to a farm in Forsnäs where he lived until death in 1872.

Rääf is buried together with some possessions in a Viking-style mound at the shores of Lägern.

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