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where the variables refer to Friedmann–Einstein universe, where is defined in the equations, is the speed of light, is the scale factor, is the radius of the universe (measured in light years) and its maximal value, is the mean density of matter, is time and the age of the universe (last line, measured in years), and is the Einstein's gravitational constant.
A blackboard-system application consists of three major components The software specialist modules, which are called knowledge sources (KSs).Like the human experts at a blackboard, each knowledge source provides specific expertise needed by the application.
Stick-slip effect with a chalk on a blackboard. Chalk sticks are produced in white and in various colours, especially for use with blackboards. White chalk sticks are made mainly from calcium carbonate derived from mineral chalk or limestone, while coloured chalk sticks are made from calcium sulphate in its dihydrate form, CaSO 4 ·2H 2 O, derived from gypsum.
If you're having problems sending mail, there are a few troubleshooting steps you can take to fix the problem. Restart your computer:. If you haven't shut down your computer in a while, we recommend that you begin troubleshooting by restarting your computer.
Why You Can’t Seem to Stay Asleep (Plus, How to Finally Catch Some Zzz’s) Medically reviewed by Lauren Castiello, MS, AGNP-C — Written by Adrienne Santos-Longhurst — Updated on March 27, 2023
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Like the stock market and foreign car engines, erections are mysterious things that seem to have a mind of their own. When they don't happen, it can be disappointing, at the very least.
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