alpha

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alpha

1. the first letter in the Greek alphabet (Α, α), a vowel transliterated as a
2. Brit the highest grade or mark, as in an examination
3. 
a. involving or relating to helium-4 nuclei
b. relating to one of two or more allotropes or crystal structures of a solid
c. relating to one of two or more isomeric forms of a chemical compound, esp one in which a group is attached to the carbon atom to which the principal group is attached

alpha

(al -fă) (α)
1. The first letter of the Greek alphabet, used in stellar nomenclature usually to designate the brightest star in a constellation or sometimes to indicate a star's position in a group.
2. Symbol for right ascension.

alpha

[′al·fə]
(electronics)
The ratio between the change in collector current and the change in emitter current of a transistor.
(science and technology)
The first letter in the Greek alphabet: α, A.

ALPHA

(language)
(Or "Input") An extension of ALGOL 60 for the M-20 computer developed by A.P. Ershov at Novosibirsk in 1961. ALPHA includes matrix operations, slices, and complex arithmetic.

["The Alpha Automatic Programming System", A.P. Ershov ed., A-P 1971].

Alpha

(2)
1. <tool> A compiler generator written by Andreas Koschinsky <koschins@cs.tu-berlin.de> and described in his thesis at the Technische Universitaet Berlin. Alpha takes an attribute grammar and uses Bison and Flex to generate a parser, a scanner and an ASE evaluator (Jazayeri and Walter).

The documentation is in german.

Alpha

(1) See WolframAlpha.

(2) A family of RISC-based, 64-bit CPUs and computer systems from HP. Originally developed by Digital, which was acquired by Compaq and then HP, the first model introduced in early 1992 was the 150 MHz 21064-AA, considered equivalent to a Cray-1 on a single chip. Subsequent Alpha models continued to blaze the trails for high-speed microprocessors. Alpha-based servers (AlphaServers) run under Tru64 Unix and OpenVMS. In the mid-1990s, Windows NT was ported to the Alpha platform, but support was later dropped.

Alpha Went to Intel
In 2001, Compaq sold all Alpha intellectual property to Intel and announced it would switch its high-end servers to Intel's Itanium processors by 2004. HP acquired Compaq in 2002 and introduced enhanced AlphaServers. Orders were accepted for the new machines until April 2007, and support and service were promised until 2012.


Alpha Models
Shown here are a number of Alpha servers from low to high end. The Alpha chips are always pushing the envelope in performance and architecture. (Image courtesy of Compaq Computer Corporation.)
References in periodicals archive ?
Moreover, NetB toxin shows 30% identity with alpha toxin of Staphylococcus aureus and 29% identity with Bacillus cereus haemolysin II toxin.
The genotyping by PCR suggested that alpha toxin is linked to C.
The present study was carried out to isolate the bacteria from suspected cases of Black quarter from swab and tissues by conventional methods and detection of alpha toxin producing Clostridium chauvoei by amplification of Ccta gene for diagnosis.
Immunization with recombinant alpha toxin protects broiler chicks against experimental challenge with Clostridium perfringens.
Lane 3 revealed a band at the 43 kDa region for alpha toxin and a band at the 30 kDa region for the mature epsilon toxin, respectively.
perfringens type A, producing alpha toxin, is a common isolate from cases of caprine enterotoxemia (Daube et al.
Amplification of universal oligonucleotide sequence (CC-193-F CC-16S-R) and alpha toxin gene (ccta): PCR conditions were set according to primers used in amplification.