critical diameter
2.Nitrogen adsorption isotherms at liquid nitrogen temperature for hundreds zeolite material samples were determined by Micromeritics ASAP 2400. The results of pore size distribution calculated by BIH method and MP method showed that secondary pore can be distinguished from micropore inside framework by critical pore diameter of 2.0 nm (BIH) or 1.5 nm (MP).
4.The result shows that, if Reynolds number Re ≤ ReC1(the low critical Re), the Ekman flow is stable, if Re≥ ReC2(the high critical Re), the Ekman flow during the crucible deceleration period is unstable, and the Ekman flow height h increases with increase of the crucible diameter Φ and the maximum variation of the rotation speed △ωmax .
5.The critical section thickness of the Pr_(60)Cu_(20)Ni_(10)Al_(10) composition is 5 mm in diameter for die cast, which exhibits a distinct glass transition and a wide supercooled liquid region (SLR). The glass transition temperature is 409 K when the scanning rate is 10K/min, and it exhibits paramagnetic in room temperature.
6.The critical section thickness of the Tb__(36)Y_(20)Co_(20)Al_(24) composition is 5 mm in diameter for die cast, which exhibits higher glass transition temperature and elastic moduli. A two-dimensional (2D) thin film composed of Tb nanocrystals with uniform orientations is fabricated from Tb_(65)Fe_(25)Al_(10) alloy melt upon quenching.
7.When the double 45° four-blade-inclined agitators are used, d/D=0.5 (d-diameter of agitator,D-diameter of vessel), h/D=0.18 (h-height between the first agitator and bottom of the vessel), s/d=1 (s-distance between the agitators), the critical agitator speed n_c is the least, and the blight between the agitators is small.
8.The shadow mask is the critical component of the Colour Picture Tube and the important component for the choice of colour ,Its function concentrates on the limitation of electronics bound diameter and the screening direction ,The electronics bound which is sent by the electronics gun goes scanning, During the scanning process, we should guarantee every bound gathering into the small holes situated on the screen, Then these bounds will point to the regularized position through the small holes on the flat mask, And then three basic colours will be produced, At the same time, those useless electronics will be blocked by the mask board.
10.The Correlation of flash-back and blow-off phenomena to the primary air coefficients in released gas burning was obtained through experiments and analysis on a burner with flame port of 6mm inner diameter. Finally, a graph illustrating the flame stability limits was plotted in accordance with the theory on critical boundary velocity gradient proposal by Lewis and Von Elbe.
