Other

Shinji Fukuda

Koichi Fukuda

Takafumi Kawano

Masataka Yamanaga

Yoshihiro Takehisa

Sumio Terada

Shizuaki Hashimoto

A radio communication apparatus and method employs frequency hopping in a predetermined pattern based on a hopping carrier table. An intermittent receiving section activates a carrier frequency designating section every constant cycle to give a command for receiving the control channels of opposing radio base stations. In the case in which a hopping order in a hopping carrier table is skipped by n to carry out switching every intermittent receiving cycle in an intermittent receiving operation, an intermittent receiving cycle is set in such a manner that the n and a total number m of hopping carrier frequencies in the hopping carrier table have a prime relationship with each other. The electric field strength of a carrier frequency in a spare carrier list is measured by the intermittent receiving operation and an interference counter of a spare carrier is increased or decreased corresponding to a frequency at which the electric field strength exceeds or does not exceed a predetermined threshold. A carrier frequency deleted from a hopping pattern and placed in the spare carrier list is set to have the worst value as the initialized value of its interference counter.

Radio communication apparatus and interference avoiding method

The dielectric ceramic composition of the first aspect of the invention comprises an essential component having a compositional formula of xBaO-yTiO -zNd O (wherein 0.02&lE;x&lE;0.2, 0.6&lE;y&lE;0.8, 0.01&lE;z&lE;0.3, x&plus;y&plus;z&equals;1), and contains two types of glass powder, one comprising PbO, ZnO and B O and the other comprising SiO and B O , and a third component that comprises Al O , SrTiO , GeO and Li O. Its advantages are that it can be sintered at low temperatures, its dielectric constant &egr; falls between 10 and 50 or so, its unloaded Q is large, and its temperature-dependent resonant frequency change is small. The dielectric ceramic composition of the second aspect of the invention comprises an essential component having a compositional formula of s(xBaO-yTiO -zNd O )-tNd Ti O (wherein 0.02&lE;x&lE;0.2, 0.6&lE;y&lE;0.8, 0.01&lE;z&lE;0.3, x&plus;y&plus;z&equals;1, 0.1&lE;s&lE;0.8, 0.2&lE;t&lE;0.9, s&plus;t&equals;1), and contains two types of glass powder, one comprising PbO, ZnO and B O and the other comprising SiO and B O , and a third component that comprises Al O , SrTiO , GeO and Li O. Its advantages are that it can be sintered at low temperatures, its dielectric constant &egr; falls between 10 and 50 or so, its unloaded Q is large, and its absolute value of a temperature coefficient of resonant frequency &tgr; is small. Still another advantage of the composition is that its relative dielectric constant &egr; , its unloaded Q and its temperature coefficient of resonant frequency (&tgr; ) can be controlled in any desired manner by controlling the Nd Ti O content of the composition.

Dielectric ceramic composition

A rolling bearing for a bearing unit is applicable to so-called under-race lubrication employing an oil air method or an oil mist method. A lubrication oil is supplied toward rolling elements (,) through oil supply channels (,) from a bottom (,) of an annular groove (,) formed in one end face (,) of an inner ring (,). A V-shaped groove (,) is provided along an edge of a raceway groove (,) of the inner ring (,) circumferentially of the inner ring. Outlet ports (,) of the oil supply channels (,) are provided in a recess defined by one of inclined surfaces of the V-shaped groove (,). A space (S) is defined between the outlet ports (,) and the rolling elements (,). A sufficient amount of air flows through the space (S), whereby the lubrication oil is supplied to the rolling elements (,) and the raceway groove (,).

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Fukuoka-shi, Fukuoka, Japan

Shinji Fukuda