Abstract: The present invention provides a method for producing ?-olefin polymer, comprising polymerizing ?-olefins in the presence of a halogen atom-containing acid catalyst by use of an aliphatic hydrocarbon having 3-12 carbon atoms, which contains 5 to 95 mass % of ?-olefin, as a raw material; removing catalyst residue and halogen-containing compounds by bringing a product in the polymerization step into contact with an aluminum atom-containing inorganic solid treatment agent with or without deactivating the catalyst; and separating the ?-olefin polymer. According to this method, the catalyst residue and other halogen-containing compounds can be removed, without relying on aqueous deactivation and separation steps using an alkaline aqueous solution or the like, from a polymerization reaction product obtained by polymerization in the presence of a halogen-containing acid catalyst by use of an ?-olefin-containing liquid hydrocarbon as a raw material.

Abstract: A silicon carbide-silicon carbide fiber composite consists of silicon carbide particles and silicon carbide fibers. The composite has excellent oxidation resistance and finds a wide range of application as heat resistant material. The silicon carbide conversion method is simple and consistent enough to ensure production of silicon carbide-silicon carbide fiber composites with minimized variation in quality.

Abstract: A graphite-silicon carbide composite comprises a graphite substrate and a silicon carbide layer formed thereon and comprising silicon carbide particles in fused and contact bonded state. The composite has excellent oxidation resistance and finds a wide range of application as heat resistant material. The method of forming a silicon carbide layer on graphite surface is simple and consistent.

Abstract: A silicon carbide-silicon carbide fiber composite consists of silicon carbide particles and silicon carbide fibers. The composite has excellent oxidation resistance and finds a wide range of application as heat resistant material. The silicon carbide conversion method is simple and consistent enough to ensure production of silicon carbide-silicon carbide fiber composites with minimized variation in quality.

Abstract: A graphite-silicon carbide composite comprises a graphite substrate and a silicon carbide layer formed thereon and comprising silicon carbide particles in fused and contact bonded state. The composite has excellent oxidation resistance and finds a wide range of application as heat resistant material. The method of forming a silicon carbide layer on graphite surface is simple and consistent.

Abstract: The present invention provides a method for producing ?-olefin polymer, comprising polymerizing ?-olefins in the presence of a halogen atom-containing acid catalyst by use of an aliphatic hydrocarbon having 3-12 carbon atoms, which contains 5 to 95 mass % of ?-olefin, as a raw material; removing catalyst residue and halogen-containing compounds by bringing a product in the polymerization step into contact with an aluminum atom-containing inorganic solid treatment agent with or without deactivating the catalyst; and separating the ?-olefin polymer. According to this method, the catalyst residue and other halogen-containing compounds can be removed, without relying on aqueous deactivation and separation steps using an alkaline aqueous solution or the like, from a polymerization reaction product obtained by polymerization in the presence of a halogen-containing acid catalyst by use of an ?-olefin-containing liquid hydrocarbon as a raw material.

Abstract: The present invention provides a transmitting apparatus, a transmitting method, a receiving apparatus, a receiving method, and a transmitting and receiving system that allow the maximum waiting time for the beginning of a content to be shortened in a near-on-demand transmission. When the length of a content is denoted by L seconds, the number of channels on which the content is transmitted is denoted by K, and the beginning detecting time of the content on the reception side is denoted by ?, if L satisfies the relation of ?*(2K?1) (where L and K are contents), the beginning detecting time ? can be decreased to L/(2K?1) against L/K as the conventional value. In reality, the transmission side divides L by the ratio of (2K?1) and repeatedly transmits each divided portion (section) on a discrete channel.

Abstract: The OD servers, encoders, NOD servers and CPUs supply voice data, character data and remote control data together with the control information. A transmitter modulates the control information and voice data, etc. by the QPSK modulation method. An infrared ray emitter outputs the modulated infrared ray depending on the modulated signal. A receiving apparatus reproduces acoustic signal from the modulated infrared ray and displays characters and also transmits the signal corresponding to the remote control data to the transmitting apparatus with the infrared ray. An infrared ray detector receives the modulated infrared ray output from the receiving apparatus. Thereby, with this system, the signal, required by the receiving side or suitable for the condition of the receiving side, supplied through many channels can be transmitted without any restriction on the wiring.

Abstract: The OD servers, encoders, NOD servers and CPUs supply voice data, character data and remote control data together with the control information. A transmitter modulates the control information and voice data, etc. by the QPSK modulation method. An infrared ray emitter outputs the modulated infrared ray depending on the modulated signal. A receiving apparatus reproduces acoustic signal from the modulated infrared ray and displays characters and also transmits the signal corresponding to the remote control data to the transmitting apparatus with the infrared ray. An infrared ray detector receives the modulated infrared ray output from the receiving apparatus. Thereby, with this system, the signal, required by the receiving side or suitable for the condition of the receiving side, supplied through many channels can be transmitted without any restriction on the wiring.

Abstract: The present invention provides a transmitting apparatus, a transmitting method, a receiving apparatus, a receiving method, and a transmitting and receiving system that allow the maximum waiting time for the beginning of a content to be shortened in a near-on-demand transmission.

Abstract: A multi-optical-axis photoswitch incorporating a light emitting unit and a light receiving unit between which a multiplicity of optical axes exist. In the multi-optical-axis photoswitch, the ratio of the number of optical axes in which the quantity of received light exceeds a predetermined threshold value with respect to the number of all of optical axes is displayed by a plurality of display lamps disposed concentrically, in particular, by a bar graph. Thus, the operation can be indicated such that movement must be performed in a direction in which the value of the bar graph is increased.

Abstract: It is possible to produce butene polymer at high yield, which polymer contains 80 mol % or more of polymer molecules having terminal vinylidene structure and being low in the content of residual organic fluorine by a process comprising Step (I) to polymerize in liquid phase by adding complex catalyst composed of boron trifluoride, ether and alcohol and/or water in specified ratios to C4 fractions and Step (II) to reduce the content of trimer and lighter components contained in the obtained polymer to 0.2% by weight or less by distillation.

Abstract: A controller for use with a plurality of area sensors that controls more than one area sensor having a multiple of optical paths connecting a set of a light projector and a light receiver, the controller comprising: a master controller, for controlling not only one-of the area sensors but also at least one other area sensor; and a slave controller connected to the master controller, for performing signal transfer between the master controller and the at least one other area sensor.

Abstract: A voice recording/reproducing apparatus suitable for use in a language laboratory operates with a disk on which are recorded text segments comprising sentences and a table of contents containing text and sentence addresses. Automatic sensing of the division points between sentences in each of the text sections can be performed. Only the end portion of a sentence may be readily reproduced, and the division point following the sentence may be finely adjusted. Desired audio data may be quickly retrieved by rough retrieval operations, in which the time code is advanced or reversed by a large amount, followed by fine retrieval operations, in which the time code is advanced or reversed by a small amount. One of several pronunciation practice modes may be selected. A reduced reproduction speed capability allows a student to hear fine pronunciation of words with an invariant pitch.

Abstract: A high frequency oscillation type proximity switch, being an approach switch adapted for detecting the approach to or departure from the detector coil of a metal body, based on the change in output of the high frequency oscillator circuit, with the oscillator coil of the oscillator circuit as the detector coil, in which a small-diameter housing case is inserted in the cable interconnecting the detector head and the power source, the printed substrate for use as the signal detector circuit is provided in housing case and the housing case is filled with an insulation resin.

Abstract: A heat resistant and/or fire retardant synthetic fiber is obtained by a process comprising immersing a polyethylene fiber into a solution of acrylic acid or impregnating a polyethylene fiber with a solution of acrylic acid and irradiating the polyethylene fiber with an ionizing radiation to graft polymerize the polyethylene fiber with at least 15%, based on the weight of the polyethylene fiber, of acrylic acid, or a process comprising irradiating a polyethylene fiber with an ionizing radiation and then immersing the polyethylene fiber into a solution of acrylic acid or impregnating the polyethylene fiber with a solution of acrylic acid to graft polymerize the polyethylene fiber with at least 15%, based on the weight of the polyethylene fiber, of acrylic acid.

Abstract: A fluorescent display having improved readability in bright light and reduced visibility of internal connecting components and wiring is provided by placing the anode segments on a first background having a color similar to that of the unilluminated segments and the connecting components and wiring on a second background surrounding the first and having a color similar to that of said components and wiring.

Abstract: There is disclosed a novel cell separator made of a grafted membrane comprising a polyethylene film which is graft-copolymerized with a monomer having an ion exchange group, characterized in that said membrane has an area which is not grafted at all or an area of low degree grafting. By making use of this membrane, a small size and thin cell having excellent performance as well as satisfactory mechanical strength can be produced at low cost with great advantages.

Abstract: In a fluorescent display panel comprising a grid member comprising, in turn, a pair of grid leads extended integrally from a grid frame to which a grid is attached, each grid lead is fixed to a substrate of the panel. When driven in a time division fashion, the panel produces audible noises disagreeable to the ear. In order to reduce the noises, at least one of the grid lead pair is deformed perpendicularly of the grid at its portion between the grid frame and the portion at which the grid lead is fixed to the substrate. The deformation may be an indent directed either away or towards the substrate, with the thickness of the grid lead rendered at the position of the indent. The deformation may alternatively be a bend, with the thickness kept uniform. Also in the latter case, an indent is formed in the grid lead.

Abstract: A method for manufacturing heat-resistant polyvinyl chloride fiber is given without injuring the flame-retardance of the polyvinyl chloride fiber, by grafting acrylic acid or calcium acrylate onto polyvinyl chloride by a radiation chemical process. The polyvinyl chloride fiber is irradiated either in contact with a mixture of water, ethylene dichloride and acrylic or in contact with a mixture of methanol, water, ethylene dichloride and calcium acrylate. In the case of the grafting of acrylic acid the graft fiber is subjected to a heat treatment or grafted polyacrylic acid is converted to a divalent metal salt.