The ordinary convexity,geometrical convexity,logarithmical convexity and the exponential convexity are mentioned in the first two sections;the ideal convexity,integral convexity and the β-convextiy are presented in the central three sections;for the more generalized convexties are briefly introduced in the last section.

The purpose for this paper is to give a sufficient condition of Banach spaces having Banach Saks property by using the characteristic of convexity E 0(X).

The main differences between radiation angle and coverage angle are given, and the loudspeak′s directivity index is measured by two methods.

The definition of directivity factor,directivity index & equation are introduced firstly.

Measuring directivity of phased-array acoustic transmitter in acoustic log.;

Numerical computation and experimental test of directivity pattern of low frequency flex-tensional transducer;

Analysis and experiment study on directivity of vector sensors located on complicated boundaries;

The radiation pressure and directional formulation of the first vibration mode are calculated by use of Rayleigh-integration,the directional pattern in free boundary is plotted with the help of computer.

The general pressure and directional formulation of different vibration mode are deduced, and the directional pattern is plotted using computer.

The radiation pressure and directional formulation of two rank vibration mode are deduced,with the help of compute,the directional pattern in simply supported boundary is plotted.