In part two, new filter systems with the 0.5μm filter elements were installed in the five dental operatories and vacuum levels at the high-velocity evacuation cannula tip were measured with a vacuum gauge.
An optimal smoke control strategy was developed and evaluated using three criteria: critical velocity, minimal smoke spreading area and available safe evacuation time.
Velocity and ejection pumping are proposed as novel evacuation techniques to assist the static differential pumping already in use in the environmental scanning electron microscope.
By simulation experiments, we find subtle effects of the discretization degree and walking velocities on the shape of the crowd near the exit, the evacuation time of each individual at different locations, and the evacuation efficiency of pedestrians formulated by two time indicators.
The effect of suction velocity on the smoke control effect are analyzed to determine the optimal exhaust velocity for the safety evacuation in a subway station.
The longitudinal ventilation velocity from which the backlayering disappears, usually designated by "critical ventilation velocity", is a key parameter to ensure proper evacuation of users and emergency intervention.
Total evacuation is unlikely.
