In this paper,a method is introduced to study the mechanism of crystal growth by in situ obervation on the step movements of the crystal grown from aqueous solutions.

The experiments of in situ observation of the step movement in the crystal growth of cadmium lodide in aqueous solution are reported in this paper,As a result of in situ observation ,the Berg′s effect on the step movement is put forward,and this kind of Berg′s effect is analyzed.

A case of pressurized combustion is presented, which is caused by the unsteady shedding flow of separated vortex in the forward and backward facing step flow.

Analytical study of piston secondary motion and the piston scraping force;

The gap between piston and cylinder wall of an internal combustion engine is small, however it may induce the piston secondary motion (lateral and rotational motion) periodically and generate unwanted sound and vibration.

The characteristics of piston secondary motion consisted of the piston radial displacement and the swing angle around the piston pin.

Furthermore, we compared the differences between the training group and the control group (11 subjects) and found out: 1) the training with first-order motion gratings can improve subjects’performance in first-order motion direction discrimination but the improvement can’t be transferred to the performance in second-order motion task; 2) the tra

The results showed that:1) the training with first-order motion gratings can improve subjects\'performance in first-order motion direction discrimination but the improvement can\'t be transferred to the performance in second-order motion task;2) the training with second-order motion gratings can improve subjects\'performance in both first-and second-order motion direction discrimination tasks.