Ube Industries, Inc.

Ryozo Kitoh

Sumio Umemura

Taizo Uda

Koichi Fukuda

Harumi Ikezawa

Yoshiaki Fujiyama

Shotaro Hayashi

Noriaki Arimura

Shigeru Itoh

Hideaki Fukui

Yasutaka Arima

Atsunori Takasugi

Kosuke Itoh

Mikio Hitaka

Takaki Ono

Tetsuya Fujimoto

A dielectric filter having a plurality of .lambda./4 coaxial dielectric resonators in stages, the resonator being filled with a dielectric material between its inner and outer conductors, comprising at least one stage in which the outer conductor of the .lambda./4 coaxial dielectric resonator is grounded via a capacitance or inductance. The dielectric filter is embodied as a low-pass filter, high-pass filter or a band-pass filter. As a result, by utilizing dielectric resonators having a desired resonant frequency, it is possible to readily achieve a dielectric filter having an attenuating pole in the neighborhood of the frequency passband and small in insertion loss.

Dielectric filter using quarter wavelength coaxial dielectric resonators

A method for preparing a PLZT ceramic having a composition represented by the following general formula:

Method for preparing PLZT transparent ceramic

A dielectric resonator to be advantageously used in 0.5-6 GHz band and having a large unloaded Q value, and adequate relative dielectric constant, a good stability of .tau..sub.f and a superior linearity of temperature characteristic of the resonance frequency, may be constituted by the dielectric porcelain composition expressed by the formula:

Dielectric porcelain composition

A dielectric ceramic composition comprising oxides of strontium, zinc, niobium, and titanium, which is represented by the following composition formula;

Dielectric ceramic composition

Benzene is catalytically oxidized in the vapor phase with oxygen in the presence of an alcohol to be converted to phenol. The catalyst used is represented by the formula: M.sub.a Ag.sub.b P.sub.c O.sub.d wherein M is selected from zinc, titanium, zirconium, tin, bismuth and vanadium, Ag is silver, P is phosphorus and O is oxygen, and a=1, b=0.005.about.5 and c=0 to 6. Phenol is obtained at an enhanced yield even though the catalytic oxidation is carried out at a relatively low temperature as compared with conventional catalytic oxidation processes.

Process for preparing phenol

Disclosed is a water resistant catalyst for reducing nitrogen oxides with ammonia, which catalyst comprises barium sulfate and vanadium(IV)oxide sulfate which has peaks at 940 cm.sup.-1 and 510 cm.sup.-1 in an infrared absorption spectrum.

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Yamaguchi, Japan

Ryozo Kitoh