Abstract: A silicon carbide ceramic honeycomb structure having large numbers of axially penetrating flow paths partitioned by porous silicon carbide cell walls, the cell walls having porosity of 35-50% and a median pore diameter of 8-18 ?m, when a straight line C is drawn in parallel with the cell wall surface such that it passes a center in the direction of the thickness T of the cell wall, and straight lines are drawn in parallel with the straight line C such that they are separate from the straight line C by ±T/5 and ±2T/5 in the thickness direction of the cell wall, to measure the lengths (pore widths) of pore portions crossing each straight line, and the number of pores crossing each straight line, in a cell wall cross section perpendicular to the axial direction, an average pore width W determined by averaging the lengths (pore widths) of all measured pore portions being 10-25 ?m, and the number N of pores per length determined by dividing the total number of the measured pores by the total length of the straight

Abstract: A silicon carbide ceramic honeycomb structure having large numbers of axially penetrating flow paths partitioned by porous silicon carbide cell walls, the cell walls comprising silicon carbide particles as aggregate and binder layers for binding the silicon carbide particles, the binder layers having at least a cordierite phase and a spinel phase, and the molar ratio M1 of the cordierite phase [=cordierite phase/(cordierite phase+spinel phase)] being 0.4-0.9.

Abstract: A silicon carbide ceramic honeycomb structure having large numbers of axially penetrating flow paths partitioned by porous silicon carbide cell walls, the cell walls comprising silicon carbide particles as aggregate and binder layers for binding the silicon carbide particles, the binder layers having at least a cordierite phase and a spinel phase, and the molar ratio M1 of the cordierite phase [=cordierite phase/(cordierite phase+spinel phase)] being 0.4-0.9.

Abstract: A method for repairing a die-casting sleeve comprising a ceramic-made inner cylinder shrink-fit in a metal-made outer cylinder, comprising the steps of detaching the used inner cylinder from the outer cylinder by heating; forming a diameter-increasing layer on a peripheral surface of the outer cylinder before or after shrink-fitting a new inner cylinder in the outer cylinder; assembling a new inner cylinder in the outer cylinder; and then machining the diameter-increasing layer to a cylindrical shape.

Abstract: A method for repairing a die-casting sleeve comprising a ceramic-made inner cylinder shrink-fit in a metal-made outer cylinder, comprising the steps of detaching the used inner cylinder from the outer cylinder by heating; forming a diameter-increasing layer on a peripheral surface of the outer cylinder before or after shrink-fitting a new inner cylinder in the outer cylinder; assembling a new inner cylinder in the outer cylinder; and then machining the diameter-increasing layer to a cylindrical shape.

Abstract: A startup operation control apparatus includes a main-power-source operation unit, a determining unit, a memory, and a controller. The main-power-source operation unit is operated to supply and shut off power from a power source. The determining unit determines whether or not the main-power-source operation unit has been operated. The memory stores, every time an operation mode of a processing device that operates by receiving power supply from the power source changes, information representing the changed operation mode in an updating manner. If the determining unit determines, upon a shift from a power shutoff state to a power supply state, that the main-power-source operation unit has not been operated, the controller performs control so that the processing device operates in the operation mode represented by the information stored in the memory.

Abstract: A startup operation control apparatus includes a main-power-source operation unit, a determining unit, a memory, and a controller. The main-power-source operation unit is operated to supply and shut off power from a power source. The determining unit determines whether or not the main-power-source operation unit has been operated. The memory stores, every time an operation mode of a processing device that operates by receiving power supply from the power source changes, information representing the changed operation mode in an updating manner. If the determining unit determines, upon a shift from a power shutoff state to a power supply state, that the main-power-source operation unit has not been operated, the controller performs control so that the processing device operates in the operation mode represented by the information stored in the memory.

Abstract: A computer network which uses a community wiring for TV or wired broadcast and which is hardly influenced by disconnection, short-circuit and noise. The network is a coaxial cable network (1) which can transmit a mixed signal of the received signal of a receiver and a digital signal modulated into an RF signal. This coaxial cable network is provided with a signal input unit (2) for inputting a received signal into the coaxial cable network, and receivers (3a to 3c) and computers (4a to 4c) are connected with the coaxial cable network. Between the coaxial cable network and the computers, there are connected computer connection units (5a to 5c) for modulating a digital signal into an RF signal and for demodulating the RF signal into the digital signal.

Abstract: There is disclosed a method of producing an aluminum composite material in which the content of silicon carbide can be made higher as compared with conventional methods, and the production cost is low, and the method can be carried out easily. An aluminum composite material of low-thermal expansion and high-thermal conductivity is produced by this method. A mixture of powder of aluminum metal or an alloy thereof and silicon carbide powder is pressurized and compacted to form a green compact. Subsequently, this green compact is charged into a mold, and is heated and compacted into a predetermined shape at a temperature not less than a melting point of the aluminum metal or the alloy thereof.