Nippon Oil Company

Fujitsu Corporation

Shinagawa Refractories Co., Ltd.

Hiroaki Takashima

Seiichi Uemura

Makoto Sasaki

Takao Hirose

Shunichi Yamamoto

Syunichi Yamamoto

Osamu Kato

Minoru Nagai

Syuuichi Okada

Kenji Arai

Tetsuo Tomita

Kiyoshi Miyazawa

Seiji Hamada

Yoshiyuki Oota

Tsutomu Kihara

Koichi Hiramoto

Michiharu Harakawa

Toru Imamura

Osami Kato

Osamu Katoh

Hazime Nakazima

Minoru Nagi

A P cell communication unit and an S cell communication unit establish communication with a mobile station using a plurality of radio resources of a first cell and a second cell overlapping the first cell. A moving speed measuring unit measures a moving speed of the mobile station based on a signal transmitted from the mobile station using the radio resources of the first cell. A scheduling processing unit stops an allocation of the radio resources of the second cell to the mobile station based on a wireless environment with the mobile station. The scheduling processing unit starts an allocation of the radio resources of the second cell to the mobile station when the moving speed of the mobile station is less than a certain value in a state in which the allocation of the radio resources of the second cell is stopped.

Base station device, wireless communication system, and base station device control method

A REC unit manages card information on each of L1 cards handling a physical channel, L2-1 cards handling a logical channel, and L2-2 cards in which a scheduling function for communication processing performed with respect to the L1 card and/or the L2-1 card is implemented. A call control card of the REC unit selects, for each of first to third channels, a processing card establishing a signal path relevant to the logical channel from among the L1 card, the L2-1 card, and the L2-2 card. The call control card transmits connection relation information indicating a combination of the processing cards selected to each processing card. On the basis of the connection relation information received from the call control card, each processing card establishes the signal path for each of the first to third channels relevant to the logical channel between the processing cards.

Base station apparatus

A radio base station including: each of communication processing components being coupled to each of antennas forming each of sectors for a radio communication respectively, each of the communication processing components including communication processors being configured to perform each of functions for the radio communication and control each of radio resources for each of the functions respectively, and a control processor configured to select a first communication processing component and a second communication processing component respectively, select a first communication processor from the communication processors in the first communication processing component, transfer a radio resource of the radio resources that is controlled by the first communication processor to a second communication processor that is in the second communication processing component and performing a same function as the first communication processor, and upon transferring the radio resource of the radio resources, reduce a power of the first communication processor.

Radio base station and power control method

An intermittent reception control apparatus controls intermittent reception in communication between a base station apparatus and mobile station apparatuses. The intermittent reception control apparatus comprising a control unit that generates DRX parameters, which are intermittent reception parameters, and transmits the generated DRX parameters to the mobile station apparatuses. Further, the DRX parameters include information on the timing at which to cause the mobile station apparatuses to enter an active state and are common to all of the mobile station apparatuses, where the active state is a state where reception of signals transmitted from the base station apparatus is enabled. The intermittent reception control apparatus further comprising a scheduler that transmits to the mobile station apparatuses a DRX command that operates to force these apparatuses to enter an inactive state.

Intermittent reception control apparatus, computer-readable recording medium, and intermittent reception control method

Pitch-based carbon fibers superior in compression characteristics are obtained by mixing a polycyclic aromatic compound and a hydrogen donating compound at a mole ratio of the latter to the former in the range of 0.1 to 10, polymerizing the resulting mixture at a temperature of 50.degree. to 400.degree. C. in the presence of a Lewis acid as catalyst, then removing the catalyst, thereafter heat-treating the resulting polymer to obtain a pitch containing 5-40% of anisotropic spheres of 5-60 .mu.m, having a total amount of aliphatic hydrogen of 25-50% and an amount of aliphatic hydrogen after .beta. of 5-25% and containing not more than 30% of oriented carbon based on a total amount of aromatic carbon, then spinning said pitch, then making the resulting pitch fiber infusible and subjecting the pitch fiber thus rendered infusible to a carbonization treatment.

Process for producing pitch-based carbon fibers superior in compression

A pitch-based carbon fiber having a high strength is produced by (a) treating a heavy oil at a temperature of 370.degree. to 480.degree. C. and a pressure of 2 to 50 kg/cm.sup.2 ; (b) separating and removing insoluble solids from the heat-treated oil so that the insoluble solids content is not higher than 50 ppm; (c) subjecting the oil to thin film distillation at a temperature of 250.degree. to 450.degree. C., a pressure of not higher than 100 mm Hg and a film thickness of not larger than 5 mm; (d) heat-treating the resulting pitch at a temperature of 340.degree. to 450.degree. C. while passing an inert gas at atmospheric or reduced pressure to obtain an optically anisotropic pitch having a softening point of 260.degree. to 300.degree. C., a quinoline insolubles content of not higher than 40 wt % and an optically anisotropic phase content of 60 to 100 vol %; (e) melt-spinning said optically anesotropic pitch in a melt-spinning apparatus having a nozzle with a vertically longer molded product disposed therein, at a temperature of 280.degree. to 360.degree. C. and a spinning viscosity of 300 to 3,000 poise; (f) rendering the resulting pitch fiber infusible and (g) calcining the infusibilized fiber in an inert gas atmosphere, initially at a temperature of 650.degree. to 850.degree. C. and subsequently conducting calcination at a temperature of 1,200.degree. to 3,000.degree. C.

Process for producing pitch-based carbon fibers

Pitch for the production of carbon fibers which contains from 5 to 40% of the optically anisotropic region which is insoluble in organic solvents having a solubility parameter from 7.4 to 9.0 but is soluble in organic solvents having a solubility parameter from 9.2 to 11.0.

Pitch for the production of carbon fibers

Provided is a starting pitch for producing carbon fiber by heat-treating the starting pitch to obtain a precursor pitch, melt-spinning the precursor pitch, then rendering the resultant pitch fiber infusible, followed by carbonization, and further followed by graphitization if required, the starting pitch comprising a mixture of (a) 100 parts by weight of a pitch and (b) 5 to 500 parts by weight of a methanol-insoluble and benzene-soluble component contained in a heavy oil obtained in a fluid catalytic cracking of petroleum, the heavy oil having a boiling range not lower than 200.degree. C.

Starting pitch for carbon fibers

A precursor pitch for the production of carton fibers is obtained by heat-treating a carbonaceous pitch in the form of a thin film having a thickness not larger than 5 mm at a temperature in the range of 250.degree. to 390.degree. C. and under a reduced pressure not higher than 100 mmHg. By melt-spinning this precursor pitch and subjecting the resultant pitch fiber to infusiblization and carbonization and, if required, to subsequent graphitization, there is obtained a high quality carbon fiber.

Process for preparing precursor pitch for carbon fibers

A starting pitch for carbon fibers is obtained by mixing (1) 100 parts by volume of a heavy fraction oil boiling at not lower than 200.degree. C. and obtained at the time of fluidized catalytic cracking of petroleum with (2) 10 to 200 parts by volume of a fraction boiling in the range of 250.degree. to 550.degree. C. obtained by distilling under reduced pressure an oil produced at the time of heat treating a starting pitch and then heat treating the resulting mixture at a temperature of from 370.degree. C. to 480.degree. C. under a pressure of from 2 to 50 Kg/cm.sup.2.G thereby to obtain the starting pitch for carbon fibers. The thus obtained starting pitch is heat treated to obtain a precursor pitch which is melt spun, infusibilized, carbonized or graphitized to obtain the carbon fibers.

Starting pitches for carbon fibers

A starting pitch for carbon fibers, obtained by (A) mixing together (1) a heavy fraction oil boiling at not lower than 200.degree. C. obtained at the time of fluidized catalytic cracking of petroleum, (2) a hydrogenated oil selected from aromatic hydrocarbons of 2-10 rings having their nuclei partly hydrogenated and specific fractions boiling at 160.degree.-650.degree. C. and containing such aromatic hydrocarbons and (3) a heavy fraction oil boiling at not lower than 200.degree. C. obtained at the time of steam cracking of petroleum, to form a mixture of the oils (1), (2) and (3), and then (B) heat treating the thus formed oil mixture at 370.degree.-480.degree. C. and 2-50 Kg/cm.sup.2.G thereby to obtain the starting pitch.

A pitch which affords a carbon fiber having a high strength and a high elastic modulus is obtained by treating a pitch containing 5 to 35 weight percent of an optically anisotropic region with sulfur.

Pitch for carbon fibers

A pitch which affords a carbon fiber having a high strength and a high elastic modulus is obtained by treating a pitch containing 5 to 35 wt. % of an optically anisotropic region with an oxidizing gas, followed by hydrogenation treatment if required.

A process for the production of carbon fibers which comprises using a specific optically isotropic pitch having a reflectivity of 9.0-11.0% as the material for the carbon fibers.

Process for the production of pitch-derived carbon fibers

A process for the production of high performance carbon fibers which comprises using as the starting material a specific pitch having the lowest reflectivity in the range of 8.5-9.3% and the highest reflectivity in the range of 11.8-12.5%.

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Kawasaki, Japan

Hiroaki Takashima