Danube is a station of the Paris Métro serving Line 7bis (westbound only).
The station was opened as part of a branch of line 7 from Louis Blanc to Pré Saint-Gervais on 18 January 1911. The station is built in weak ground as it was formerly a mine, where gypsum was extracted from three layers for export to the United States. It is built with arches over each of the tracks to strengthen the station box, which are supported by 220 piers, 2.5 metres in diameter, with a cumulative height of 5,500 metres. On 3 December 1967 this branch was separated from line 7, becoming line 7bis.
It is named after the Place du Danube, named after the Danube River. This street was renamed the Place de Rhin-et-Danube in 1952, adding a reference to the Rhine.
Channel, channels, and similar terms may refer to:
In computing, a channel is a model for interprocess communication and synchronization via message passing. A message may be sent over a channel, and another process or thread is able to receive messages sent over a channel it has a reference to, as a stream. Different implementations of channels may be buffered or not, and either synchronous or asynchronous.
Channels are fundamental to the process calculus approach to concurrency, and originated in communicating sequential processes (CSP), a formal model for concurrency, and has been used in many derived languages, such as occam, and Limbo programming language (via Newsqueak and the Alef programming language). They are also used in the C programming language threading library libthread, and in Plan 9 from Bell Labs, which uses libthread, as well as in Stackless Python and the Go programming language.
Channels modeled after the CSP model are inherently synchronous: a process waiting to receive an object from a channel will block until the object is sent. This is also called rendezvous behaviour. Typical supported operations are presented below using the example of the libthread channel API.
A price channel is a pair of parallel trend lines that form a chart pattern for a stock or commodity. Channels may be horizontal, ascending or descending. When prices pass through and stay through a trendline representing support or resistance, the trend is said to be broken and there is a "breakout".