Abstract: An exhaust gas purifying catalyst in which catalytic activation particles 3 composed of a catalytic element or its compound are carried on a carrier 1. The catalytic activation particles 3, as carried on the carrier 1 and exposed to the outside of the carrier 1, are coated with the carrier 1 by 20 to 90% of their whole surface area. Also disclosed is a process for producing the exhaust gas purifying catalyst.

Abstract: An ultrasonic probe comprising a coaxial cable 11 capable of transferring an energizing pulse voltage and an echo signal, at least one piezoelectric element 5, an acoustic matching layer 7 disposed on a sound transmitting face side of each piezoelectric element 5 and an acoustic backing layer 8 disposed on its opposite side, the above ultrasonic probe being adapted to transmit and receive an ultrasonic wave, wherein each piezoelectric element 5 has the following distribution of spontaneous polarization according to positions of the piezoelectric element. The spontaneous polarization of the ultrasonic probe of the present invention has differences such that the spontaneous polarization is caused to be strong at a position where the absolute value of Bessel function J.sub.0 (x/a) is large while the spontaneous polarization is weak at a position where the absolute value of J.sub.0 (x/a) is small.