Parchive (a portmanteau of parity archive, and formally known as Parity Volume Set Specification) is an erasure code system that produces par files for checksum verification of data integrity, with the capability to perform data recovery operations that can repair or regenerate corrupted or missing data. Parchive was originally written to solve the problem of reliable file sharing on Usenet, but it is now commonly used for protecting any kind of data from data corruption, bit rot, and accidental or malicious damage. Despite the name, Parchive uses more advanced techniques that do not utilize simplistic parity methods of error detection and correction.
The original SourceForge Parchive project has been inactive since November 9, 2010. As of 2014, Par1 is obsolete, Par2 is mature for widespread use, and Par3 is an experimental version being developed by MultiPar author Yutaka Sawada.
Parchive was intended to increase the reliability of transferring files via Usenet newsgroups. Usenet was originally designed for informal conversations, and the underlying protocol, NNTP was not designed to transmit arbitrary binary data. Another limitation, which was acceptable for conversations but not for files, was that messages were normally fairly short in length and limited to 7-bit ASCII text.
In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as Earth's Moon.
The world's first artificial satellite, the Sputnik 1, was launched by the Soviet Union in 1957. Since then, thousands of satellites have been launched into orbit around the Earth. Some satellites, notably space stations, have been launched in parts and assembled in orbit. Artificial satellites originate from more than 40 countries and have used the satellite launching capabilities of ten nations. About a thousand satellites are currently operational, whereas thousands of unused satellites and satellite fragments orbit the Earth as space debris. A few space probes have been placed into orbit around other bodies and become artificial satellites to the Moon, Mercury, Venus, Mars, Jupiter, Saturn, Vesta, Eros, Ceres, and the Sun.
A satellite is a subviral agent composed of nucleic acid that depends on the co-infection of a host cell with a helper or master virus for its replication. When a satellite encodes the coat protein in which its nucleic acid is encapsidated it is referred to as a satellite virus. A satellite virus of mamavirus that inhibits the replication of its host has been termed a virophage. However, the usage of this term remains controversial due to the lack of fundamental differences between virophages and classical satellite viruses.
The genomes of satellites range upward from 359 nucleotides in length for Satellite Tobacco Ringspot Virus RNA (STobRV).
Satellite viral particles should not be confused with satellite DNA.
( comtechefdata.com ), l’un des principaux fournisseurs d’équipements de communication par satellite ...LeptonGlobal Solutions, une société de Kymeta, héberge les solutions de connectivité par satellite de la société, et offre au marché des solutions clés en main, uniques, ...
LeptonGlobal Solutions, une société de Kymeta, héberge les solutions de connectivité par satellite de la société, et offre au marché des solutions clés en main, uniques, complètes et groupées, basées sur les meilleures technologies, et des services sur mesure axés sur le client ...
It is expected to make landfall in Gujarat late on Monday. “This will be the most severe cyclone to hit Gujarat in at least 20 years ... The cyclone brought gusts of up to 130mph (210kmh) putting it on par with a category 3 hurricane and one level below the IMD’s super cyclone category. A satellite image shows Cyclone Tauktae off the west coast of India.
Nous travaillons dans des zones affectées par les conflits, ainsi que le long des routes de ...Agir en tant que point focal pour les systèmes de télécommunications du DRC, y compris les radios et les téléphones par satellite.
that Elon Musk said on Tuesday, May 4, that 500,000 pre-orders for SpaceX's Starlink satellite systems have already been put in place ... Given SpaceX won the FCC's approval on April 28 to fly its Starlink satellite constellation lower in orbit, it would be hard for that internet not to be up to par.
En 2016, l'ouragan Matthew de catégorie 4 a touché terre dans le sud d'Haïti, provoquant des destructions jamais vues depuis plus d'une décennie pendant la saison des ouragans, avec des vents atteignant 230 kilomètres par heure et 600 millimètres de pluie en moins de 24 heures.
PARTechnologyCorporation (NYSE. PAR) (“PAR Technology”) announced today that its Founder and member of its Board of Directors, Dr ... Sammon Jr., will not stand for re-election and will step down from the PAR Board as of PAR Technology’s 2021 annual meeting of stockholders on June 4, 2021 ... Sammon founded PAR Technology in 1968 in Rome, NY.
LeptonGlobal Solutions, une société de Kymeta, héberge les solutions de connectivité par satellite de la ...Kepler est un fournisseur de télécommunications par satellite basé au Canada, et financé par Costanoa Ventures, IA Ventures, ainsi que par d’autres investisseurs majeurs.
In total, that means it’s sent up 240 satellites in about three weeks, which is actually around on par with the number satellites than the second-largest commercial constellation operator, Planet, has in space in total ... SpaceX flies Falcon 9 rocket booster for a record 9th time, delivers 3rd batch of Starlink satellites in two weeks.
The French government accuses Russia of having brought its intelligence-gathering satellite Olymp-K, also known as Louch, into close proximity of the French-Italian military satellite Athena-Fidus in 2017 in what Defence MinisterFlorenceParly called "an act of espionage".
France has begun its first military exercises in space to test its ability to defend its satellites, in a sign of the growing competition between world powers in Earth's orbit ... "Our allies and adversaries are militarising spacewe need to act," Defence MinisterFlorenceParly said at the time.
France has begun its first military exercises in space to test its ability to defend its satellites, in a sign of the growing competition between world powers in Earth's orbit... Codenamed "AsterX" in a nod to the first French satellite Asterix from 1965, the drills ...