It was a valued export in Silk Road trading, but the manufacturing process was kept secret. During the Tang Dynasty (618-907) and the Song Dynasty (960-1279), varieties of paper were developed for different purposes.
April 7, 2015 Written by controlguru. Like the P-Only controller, the Proportional-Integral (PI) algorithm computes and transmits a controller output (CO) signal every sample time, T, to the final control element (e.g., valve, variable speed pump).
Reticular Activating System. Often the RAC is compared to a filter or a bouncer (like at a night club) that works for your brain! It makes sure your brain doesn't have to deal with more information than it can handle, so the reticular activating system plays a big role in the sensory information you perceive daily.