摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
Novel antiflaming fibers having excellent dyeability and heat resistance are prepared from a matrix-polymerized resin which comprises polymerizing acrylonitrile in the matrix of a vinyl chloride resin. A vinyl chloride resin and/or an acrylonitrile resin can be added in a specific amount to the matrix-polymerized resin when dissolved in a spinning solvent. Substantially the same fibers are also prepared from blended polymers which comprise blending a specific vinyl chloride resin and a specific acrylonitrile resin in the specific proportion, by employing the coagulation bath of an aqueous solution of calcium chloride.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
This invention relates to a method for preparing paper board having excellent wet tensile strength and compression strength, which comprises (a) having paper board impregnated or coated with a mixture of an unsaturated vinyl ester prepolymer having a molecular weight of 300 to 3000 and having at least one hydroxyl group at the .beta.-position with respect to an ester bond in the molecule with at least one monomer selected from the group of methylacrylate, ethylacrylate and butylacrylate in a mixing weight ratio of 10:90-40:60, and (b) irradiating the paper board having the resinous mixture with electrons to cure the resinous mixture.