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GPSS

This article is about the programming language. For the UK pipeline system, see Government Pipelines and Storage System.

General Purpose Simulation System (GPSS) (originally Gordon's Programmable Simulation System after creator Geoffrey Gordon. The name was changed when it was decided to release it as a product) is a discrete time simulation language, where a simulation clock advances in uniform discrete steps. A system is modelled as transactions enter the system and are passed from one service to another. This is particularly well suited for problems such as a factory. It was popular in the late 1960s and early 1970s but is little used today. GPSS is less flexible than simulation languages such as Simula and SIMSCRIPT II.5 that model a system with discrete events that are not constrained by a uniform time step.

original - http://en.wikipedia.org/wiki/GPSS


Romada - (pancho-icq@rambler.ru)

Shrinking Atmospheric Layer Linked to Low Levels of Solar Radiation

Image of the Earth's atmosphere.

Large changes in the sun's energy output may drive unexpectedly dramatic fluctuations in Earth's outer atmosphere.

Results of a study published today link a recent, temporary shrinking of a high atmospheric layer with a sharp drop in the sun's ultraviolet radiation levels.

The research, led by scientists at the National Center for Atmospheric Research (NCAR) in Boulder, Colo., and the University of Colorado at Boulder (CU), indicates that the sun's magnetic cycle, which produces ...

More at http://www.nsf.gov/news/news_summ.jsp?cntn_id=117580&WT.mc_id=USNSF_51&WT.mc_ev=click


This is an NSF News item.

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