The Burrows–Wheeler transform rearranges a character string into runs of similar characters. This is useful for compression, since it tends to be easy to compress a string that has runs of repeated characters by techniques such as move-to-front transform and run-length encoding. More importantly, the transformation is reversible, without needing to store any additional data except the position of the first original character. The BWT is thus a "free" method of improving the efficiency of text compression algorithms, costing only some extra computation.
The Somme is a river in Picardy, northern France. The name Somme comes from a Celtic word meaning "tranquility". The department Somme was named after this river.
In most telecommunications organizations, a virtual channel is a method of remapping the program number as used in H.222 Program Association Tables and Program Mapping Tables to a channel number that can be entered via digits on a receiver's remote control.
Breaking Vegas is a television series that premiered on The History Channel in the United States in the spring of 2004. The series covers the great lengths people have gone to make money, sometimes illegally, from casinos. It premiered in Pakistan on January 19, 2006 and was renamed Decoding Casinos in India on May 9, 2006. In the Spring of 2007, it aired on The History Channel and The Discovery Channel in Canada.
The all-time medal table for all Olympic Games from 1896 to 2018, including Summer Olympic Games, Winter Olympic Games, and a combined total of both, is tabulated below. These Olympic medal counts do not include the 1906 Intercalated Games which are no longer recognized by the International Olympic Committee (IOC) as official Games. The IOC itself does not publish all-time tables, and publishes unofficial tables only per single Games. This table was thus compiled by adding up single entries from the IOC database.
In geology, depositional environment or sedimentary environment describes the combination of physical, chemical and biological processes associated with the deposition of a particular type of sediment and, therefore, the rock types that will be formed after lithification, if the sediment is preserved in the rock record. In most cases the environments associated with particular rock types or associations of rock types can be matched to existing analogues. However, the further back in geological time sediments were deposited, the more likely that direct modern analogues are not available.
Brady John Haran is an Australian-British independent filmmaker and video journalist who produces educational videos and documentary films for his YouTube channels, the most notable being Periodic Videos and Numberphile. Haran is also the co-host of the Hello Internet podcast along with fellow educational YouTuber CGP Grey. On 22 August 2017, Haran launched his second podcast, called The Unmade Podcast, and on 11 November 2018, he launched his third podcast, The Numberphile Podcast, based on his mathematics-centered channel of the same name.
The following television stations operate on virtual channel 21 in the United States:
The following television stations broadcast on digital channel 21 in the United States:
The following low-power television stations broadcast on digital or analog channel 21 in the United States:
The following television stations in the United States brand as channel 1 :