Niederau station

Niederau station is a regional station on the Leipzig–Dresden railway in Niederau in the German state of Saxony. The railway station, which was opened on 15 May 1842, for a long time had the oldest operating station building in Germany, but Deutsche Bahn stopped using the it and sold it after 2000.

History

After the opening of the Leipzig-Dresden Railway on 7 April 1839, Oberau station was the closest station to Meissen, but the inconvenient location of the station high above a cutting on the approach to Oberau Tunnel, made access difficult and so Meissen sought easier access to the line. These efforts were successful: the new Niederau station was completed on 1 April 1842 after half a year of construction and the station was opened on 15  May 1842. Simultaneously, a new direct access road was built from Meissen to Niederau, now called Niederauer or Meissner Strasse.

For a while the traffic brought by carriage from Meissen made the station competitive for trains to Leipzig or Dresden with the Coswig–Meißen branch line, which opened on 1 December 1860 and allowed direct rail journeys from Meissen to Dresden. A line was completed from Borsdorf to Meissen in December 1868, creating a direct rail link between Meissen and Leipzig. Thus Niederau station lost its importance and traffic fell sharply.

Station

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Environment variable

Environment variables are a set of dynamic named values that can affect the way running processes will behave on a computer.

They are part of the environment in which a process runs. For example, a running process can query the value of the TEMP environment variable to discover a suitable location to store temporary files, or the HOME or USERPROFILE variable to find the directory structure owned by the user running the process.

They were introduced in their modern form in 1979 with Version 7 Unix, so are included in all Unix operating system flavors and variants from that point onward including Linux and OS X. From PC DOS 2.0 in 1982, all succeeding Microsoft operating systems including Microsoft Windows, and OS/2 also have included them as a feature, although with somewhat different syntax, usage and standard variable names.

Details

In all Unix and Unix-like systems, each process has its own separate set of environment variables. By default, when a process is created, it inherits a duplicate environment of its parent process, except for explicit changes made by the parent when it creates the child. At the API level, these changes must be done between running fork and exec. Alternatively, from command shells such as bash, a user can change environment variables for a particular command invocation by indirectly invoking it via env or using the ENVIRONMENT_VARIABLE=VALUE <command> notation. All Unix operating system flavors, DOS, and Windows have environment variables; however, they do not all use the same variable names. A running program can access the values of environment variables for configuration purposes.

Television channel

A television channel is a physical or virtual channel over which a television station or television network is distributed. For example, in North America, "channel 2" refers to the broadcast or cable band of 54 to 60 MHz, with carrier frequencies of 55.25 MHz for NTSC analog video (VSB) and 59.75 MHz for analog audio (FM), or 55.31 MHz for digital ATSC (8VSB). Channels may be shared by many different television stations or cable-distributed channels depending on the location and service provider.

Depending on the multinational bandplan for a given region, analog television channels are typically 6, 7, or 8 MHz in bandwidth, and therefore television channel frequencies vary as well. Channel numbering is also different. Digital television channels are the same for legacy reasons, however through multiplexing, each physical radio frequency (RF) channel can carry several digital subchannels. On satellites, each transponder normally carries one channel, however small, independent channels can be used on each transponder, with some loss of bandwidth due to the need for guard bands between unrelated transmissions. ISDB, used in Japan and Brazil, has a similar segmented mode.