Abstract: Disclosed is an acoustic analysis apparatus. The acoustic analysis apparatus is configured to allow a user or operator to set a plurality of load input points corresponding to respective sound input sources, and an evaluation point for evaluating a level of a sound pressure transferred from each of the set load input points (S1 to S3). Then, the acoustic analysis apparatus is operable to calculate a sound pressure level-frequency characteristic of a sound pressure from each of a plurality of paths between respective ones of the load input points and the evaluation point, by a finite element method (S5), and display the sound pressure level-frequency characteristic obtained by the calculation, in such a manner as to distinguishably indicate a difference in sound pressure level between the respective sound pressures from the paths.

Abstract: An electrophotographic photosensitive member comprises a layer containing at least one member of the hydrazone compounds of the formula: ##STR1## where R.sub.1, R.sub.2 and R.sub.3 are selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted aralkyl, and substituted or unsubstituted aryl, and R.sub.1 and R.sub.2 can not be simultaneously alkyl; and R.sub.4 is substituted or unsubstituted aryl.