Speex
Speex is an audio compression format designed for speech and also a free software speech codec that may be used on VoIP applications and podcasts. It is based on the CELP speech coding algorithm. Speex claims to be free of any patent restrictions and is licensed under the revised (3-clause) BSD license. It may be used with the Ogg container format or directly transmitted over UDP/RTP.
The Speex designers see their project as complementary to the Vorbis general-purpose audio compression project.
Speex is a lossy format, meaning quality is permanently degraded to reduce file size.
The Speex project was created on February 13, 2002. The first development versions of Speex were released under LGPL license, but as of version 1.0 beta 1, Speex is released under Xiph's version of the (revised) BSD license. Speex 1.0 was announced on March 24, 2003, after a year of development. The last stable version of Speex encoder and decoder is 1.1.12.
Xiph.Org now considers Speex obsolete; its successor is the more modern Opus codec, which surpasses its performance in all areas.
Mossberg 930
The Mossberg 930 is a 12-gauge semi-automatic shotgun designed by O.F. Mossberg & Sons.
The Mossberg 930 is one of the most popular automatic shotguns, used by hunters and skeet-shooters often.
Design
The Mossberg 930 is gas operated, which means that some of the hot gases from the burning gunpowder are used to push a piston that operates the action, ejecting the spent hull and chambering a fresh shell. This gas action reduces the recoil felt by the shooter. Like other Mossberg shotguns, this shotgun has an ambidextrous safety that is located on the rear of the receiver. The Mossberg 930 takes 2¾" or 3" shells and can be accessorized with shell catchers, Picatinny rails, special muzzle brakes for door breaching, etc.
References
External links
SPX
SPX can refer to:
Superstring theory
Superstring theory is an attempt to explain all of the particles and fundamental forces of nature in one theory by modelling them as vibrations of tiny supersymmetric strings.
'Superstring theory' is a shorthand for supersymmetric string theory because unlike bosonic string theory, it is the version of string theory that incorporates fermions and supersymmetry.
Since the second superstring revolution, the five superstring theories are regarded as different limits of a single theory tentatively called M-theory, or simply string theory.
Background
The deepest problem in theoretical physics is harmonizing the theory of general relativity, which describes gravitation and applies to large-scale structures (stars, galaxies, super clusters), with quantum mechanics, which describes the other three fundamental forces acting on the atomic scale.
The development of a quantum field theory of a force invariably results in infinite possibilities. Physicists have developed mathematical techniques (renormalization) to eliminate these infinities that work for three of the four fundamental forces—electromagnetic, strong nuclear and weak nuclear forces—but not for gravity. The development of a quantum theory of gravity must therefore come about by different means than those used for the other forces.
Substring
A substring of a string 
is another string 
that occurs "in" . For example, "the best of" is a substring of "It was the best of times". This is not to be confused with subsequence, which is a generalization of substring. For example, "Itwastimes" is a subsequence of "It was the best of times", but not a substring.
Prefix and suffix are refinements of substring. A prefix of a string is a substring of that occurs at the beginning of . A suffix of a string is a substring that occurs at the end of .
Substring
A substring (or factor) of a string 
is a string 
, where 
and 
. A substring of a string is a prefix of a suffix of the string, and equivalently a suffix of a prefix. If 
is a substring of 
, it is also a subsequence, which is a more general concept. Given a pattern 
, you can find its occurrences in a string with a string searching algorithm. Finding the longest string which is equal to a substring of two or more strings is known as the longest common substring problem.
Example: The string ana is equal to substrings (and subsequences) of banana at two different offsets:
Superstring (fireworks)
At the 1976 P.G.I. (Pyrotechnic Guild International) Convention in Grand Junction, Colorado, member Robert (Rob) Berk came up with the idea of connecting a series of firecracker strings together in order to make a "superstring". Fellow members Lino Nivolo, Rudy Schwerdt, and Bob Luke collaborated in the construction. The final count of this first attempt was approximately 2,000 firecrackers. The excitement of building this string increased the following year at the annual convention in St. Croix Falls, Wisconsin when the superstring exceeded the hundred-thousand mark. To add to the excitement, auctioneer Rob Berk pounded the gavel as Lou Czaplewski paid $25 for the right to light it. Over the years, the superstring has increased in size and the amount paid to light it has exceeded $4,000.
A superstring, also known as a cracker wall, is a name commonly given to an immense bundle of firecrackers, usually numbering in the hundreds of thousands, which are often a central fixture at fireworks conventions. Although large compound strings of firecrackers have been constructed since firecrackers were invented, the superstring was greatly popularized by the Pyrotechnics Guild International, whose yearly convention often features a huge superstring consisting of well over a million firecrackers. Superstrings are usually constructed over a rudimentary wooden or metallic structure as a sort of curtain wall.
