RHA

RHA is an acronym that may refer to:

Rha may refer to:

Letters from alphabets that can be called rha:

See also

Rha (Cyrillic)

Rha (Ԗ ԗ; italics: Ԗ ԗ) is a letter of the Cyrillic script. It looks like a cross-digraph of the Cyrillic letters Er (Р р) and Kha (Х х), but it is not a composable ligature.

Rha was used in the alphabet of the Moksha language, where it represented the voiceless alveolar trill /r̥/.

Computing codes

See also

Rolled homogeneous armour

Rolled homogeneous armor (RHA) is a type of armor made of a single steel composition, as opposed to layered or cemented armor. Its first common application was in tanks. It fell out of use after World War II as new anti-tank rounds were developed, against which it was ineffective.

Composition

Armored steel must be hard, yet resistant to shock, in order to resist high velocity metal projectiles. Steel with these characteristics is produced by processing cast steel billets of appropriate size and then rolling them into plates of required thickness. Hot rolling homogenizes the grain structure of the steel, removing imperfections which would reduce the strength of the steel. Rolling also elongates the grain structure in the steel to form long lines, which spreads stress loaded onto the steel throughout the metal, avoiding a concentration of stress in one area.

RHA is called homogeneous armor because its structure and composition is uniform throughout its thickness. The opposite of homogeneous steel plate is cemented or face-hardened steel plate, where the face of the steel is composed differently from the substrate. The face of the steel, which starts as an RHA plate, is hardened by a heat-treatment process.

Susan

Susan is a feminine given name, from French Susanne, from Late Latin Susanna, from Greek Sousanna, from Hebrew Šošanna, literally meaning "lily", a term derived from Susa (Persian: Šuš), a city in southwest Iran that was the ancient capital of the Elamite kingdom and Achaemenid empire.

Variations

Nicknames

Common nicknames for Susan include:

In other languages

Susan Sto Helit

Susan Sto Helit (also spelled Sto-Helit), once referred to as Susan Death, is a fictional character in Terry Pratchett's Discworld series of fantasy novels. She is the "granddaughter" of Death, the Disc's Grim Reaper, and, as such, has "inherited" a number of his abilities. She has appeared in three Discworld novels to date: Soul Music, Hogfather, and Thief of Time. She is also referred to (though not by name) at the end of Mort, when her father invites Death to her christening. She is one of the Discworld series' principal protagonists. Being both human and supernatural, Susan is frequently (and reluctantly) forced away from her "normal" life to do battle with various malign supernatural forces or, barring that, to take on her grandfather's job in his absence. Death tends to employ her in his battles against the Auditors of Reality, particularly in situations where he has no power or influence. As the series progresses, she also begins to take on roles educating children, so that, as Pratchett mentions in The Art of Discworld, she has "ended up, via that unconscious evolution that dogs characters, a kind of Goth Mary Poppins".

Davy (crater)

Davy is a small lunar crater that is located on the eastern edge of the Mare Nubium. It overlies the lava-flooded remains of the satellite crater Davy Y to the east, a formation which contains a crater chain designated Catena Davy. To the southeast of Davy is the prominent crater Alphonsus.

The outer rim of Davy is low, and the interior has been partly resurfaced. The perimeter is somewhat polygonal in shape, especially in the western half, and the southeast rim has been overlain by Davy A. The latter is bowl-shaped with a notch in the northern rim. The interior of Davy lacks a central peak, although there are some low central mounds and the rim of Davy Y forms a low ridge leading from the northern outer rim.

Catena Davy

This linear string of 23 tiny craters runs from the midpoint of Davy Y towards the walled basin Ptolemaeus, following a slightly curving course to the east-northeast. It is located at selenographic coordinates 11.0° S, 7.0° W, and has a diameter of 50 km.

This formation is not believed to be due to secondary cratering because it is not radial to a suitable source crater. The most likely cause is believed to be due to a single body that broke apart prior to impact due to tidal effects. High resolution images have demonstrated that the craters formed at about the same time since the ejecta from each crater does not overlay neighboring craters. However, there are still some scientists who believe that this chain of craters may be volcanic in origin.