This study presents effects of the vane spring stiffness on frictional power characteristics of a refrigeration compressor. Comparisons on the compressor performance are investigated for different vane spring stiffnesses with compressors designed with high and low shell pressures. Results show that while compressors with a low shell pressure using a higher spring stiffness combination may reduc...

According to the non-linear and non-stationary characteristics of vibration signal in roller grinding manufacturing process, background signals, namely when grinder is idling during contact grinding, are collected separately, decomposed into multiple by method CEEMDAN modal decomposition. Then several components removed correlation analysis. Finally, denoised analyzed wavelet threshold denoisin...

A multisurface glass roller bottle has been constructed for the growth of animal cells in culture. This bottle contains five concentrically placed glass cylinders that provide additional surfaces for the growth of animal cells. The bottle occupies the same space as a standard roller bottle, but it contains nine times the surface area of a standard bottle. L and HeLa cells can be grown in the bo...