摘要:
Ceramic fibers characterized by comprising a quaternary system composed of Si, C, N, and O and having a specific resistance of 10.sup.6 to 10.sup.10 .OMEGA..multidot.cm, and a suitable process for producing the ceramic fibers characterized by reacting infusible polycarbosilane fibers with ammonia and further heat treating the reaction product in an inert gas.
摘要:
An electromagnetic wave absorber comprising a surface layer made of a composite of fibers having an electrical specific resistance of more than 10.sup.4 .OMEGA.cm and a resin, and a wave absorbing layer made of a composite containing silicon carbide fibers having an electrical specific resistance of from 10.sup.-2 to 10.sup.4 .OMEGA.cm. The composite used in the surface layer may be prepared, for example, by impregnating the resin in between the fibers after they have been treated to be a woven cloth, mat or felt or unidirectionally arranged fibers. If a wave absorbing layer is to be made of a composite containing the silicon carbide fibers and a resin, then the composite may be prepared in the same way as above.
摘要:
Acenaphthenes are obtained by reacting cyclododecatriene in the presence of a specified catalyst. Acenaphthenes are raw materials for jet fuel, synthetic resin, dye, bacteriocide, insecticide, synthetic lubricant oil, additives for various lubricating oils, etc.
摘要:
A sheet feeding unit having a holding section; a separation pad that contacts a sheet and imparts a conveyance resistance to the sheet; a separation roller that imparts a conveyance force to the sheet; a drive source that supplies driving force to the separation roller; a conveyance roller disposed at a position downstream of the separation roller, wherein the conveyance roller rotates at a circumferential speed greater than a circumferential speed of the separation roller, to impart conveyance force to the sheet, and wherein the conveyance roller and the separation roller are disposed so as to simultaneously contact the same sheet; and a drive shutoff unit, which shuts off the driving force supplied to the separation roller when the conveyance roller imparts the conveyance force to the sheet so the separation roller rotates in a following manner with the conveyance of the sheet.
摘要:
A method of reduction treatment of metal oxides characterized by using as a material a powder containing metal oxides and containing alkali metals and halogen elements and further, in accordance with need, carbon, mixing said material with water to produce a slurry, then dehydrating this and charging the dehydrated material, mixed with another material in accordance with need, into a rotary hearth type reduction furnace for reduction.
摘要:
Disclosed is a halogen-free adhesive tape whose binding force is improved by increasing adhesion at low temperatures. Specifically disclosed is a halogen-free adhesive tape which is characterized in that an adhesive containing a natural rubber, an acrylic resin, an adhesiveness-imparting resin, an antioxidant and a plasticizer having a molecular weight of 450-3000 and a freezing point of from −30° C. to −55° C. is applied over at least one side of a tape base which is composed of a non-halogen resin composition containing no halogen element.
摘要:
An image forming apparatus includes an image forming unit, a feeder unit, and a frame unit. The frame unit includes a pair of plate-like metal frames, each plate-like metal frame having an inner surface extending in a parallel direction to a sheet feeding path and in a perpendicular direction of a surface of a recording sheet, and a plurality of connecting frames connecting and holding the metal frames to be apart from each other. The image forming unit is arranged in space defined by the connecting frames and held by the metal frames to be substantially fitted in between the metal frames. The feeder unit is attached to an end of each of the metal frames by an attachment system provided on each widthwise side of the feeder unit. The attachment system fixes the feeder unit along a direction in parallel with the inner surfaces of the metal frames.
摘要:
A rotating fluid machine is provided with a rotor chamber, a rotor accommodated in the rotor chamber, and vanes guided by vane grooves formed in the rotor. A U-shaped vane seal is held by a seal holding groove formed in the end face of each of the vanes. The opposite ends of the vane seal are fitted into slits in seal ancillary members which are fitted into engaging holes formed in the end faces of each of the vanes. The seal ancillary members are pressed by springs toward the inner circumferential face of the rotor chamber. The pressure of a gaseous phase working medium introduced into the bottom parts of the seal holding grooves is restrained from leaking out of the ends of the vane seal by the seal ancillary members. Thus, sealing performance can be secured by pressing the vane seal against the inner circumferential face of the rotor chamber.
摘要:
A laminated dielectric block (3) is formed by laminating dielectric sheets (31) each having a conductive film formed on its one surface so as to constitute at least one filter (2). A radiation element (1) is provided so as to fix to the laminating dielectric block, wherein one electrode of the filter is electrically connected to the radiation element. The other electrode (22) of the filter is connected to a feeding terminal electrode (4) provided mounting face B (a face opposing to a circuit board) of the laminated dielectric block through a via-contact (33) and a wiring (34), not being exposed to the side face. As a result, an antenna with built-in filter of the structure where even if it is mounted on a circuit board, interference between an electronic circuit on the circuit board and the feeding terminal electrode of the antenna is prevented to improve the isolation characteristic and transmitting or receiving characteristic.
摘要:
In the method for evaluating a welded part, it is performed to make an inspection press member press the welded part for connecting a plurality of wires with each other to apply a predetermined compressive load on the welded part. Next, it is performed to measure an amount of strain of the welded part when it is subjected to the compressive load. The evaluation of the welded part in welding condition is carried out by judging whether or not the measured amount of strain is within a predetermined range.