It is well known that reentrant jet motion in periodic cloud cavitation means upward flow from the cavity closure area of cloud cavitation. However the mechanism of reentrant motion seems to remain unsolved clearly. In the present study some experiments were conducted about the mechanism of reentrant motion in a fixed type cavity for a convergent-divergent nozzle. High speed video observation and image analysis based on the frame difference method were made about unsteady cloud cavitation with a periodic structure of cavitation cloud shedding. As a result, the main points are experimentally found as follows; 1) a typical pattern of reentrant motions can be caused by the pressure wave propagation from the collapse of cavitation cloud shed downstream and 2) the frame difference method is very useful in an image analysis for high speed video observation of cavitating flow because the trajectory of pressure waves can be clearly visualized by the method.
Abstract. The reliability of DNA fingerprinting in evaluating the parent/offspring relationship (pedigree) of 5 related hybrid dogs (parents: 2; offspring: 3) and 2 non-related Beagle breeds was investigated with the Myo probe. DNA was isolated from leucocyte, digested with Hinf I before subjecting to agarose gel electrophoresis and transferred to a nylon membrane eventually. The nylon membrane was hybridized with 32P-labeled Myo probe, and the respective bands were detected after autoradiography.Bands derived from the 3 offspring resembled that of either the father or mother. This clearly indicates that DNA fingerprinting can be effectively employed for pedigree evaluation, and may serve as a positive proof of paternity as well.
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