Abstract: An optical wireless communication method and apparatus that uses Manchester code via a connector connected with a personal computer. The Manchester data from the computer are converted to NRZ transmission data to be temporarily stored and read out. A frame of the read out data is appended with a head leader identifying a sender and end data at the head and end of the frame to be converted to the DMI transmission optical data. The optical data inserted between the head leader and END data are receivable being distinguished from the optical signal of the sender and optical noises. The DMI entitative data removed from the head leader and end data are converted to data of the Manchester code in the reverse course to the sender to be delivered as the Manchester data via a connector. As the optical data with the head leader and end data are distinguishable from the optical signal of the sender and optical noises, high sensitive optical receivers are available.

Abstract: A vibration isolator is composed of a cylindrical elastomer body and a cylindrical inner fixing member and an outer fixing member both made of a metallic material. The inner fixing member and the outer fixing member have flange parts formed along the edges thereof. The inner fixing member which has a smaller diameter than the outer fixing member is fixed to the inside diameter side of the elastomer body and the outer fixing member is fixed to the outside diameter side of the elastomer body. The elastomer body is formed of either an elastomer having a thermal conductivity in the range of from 1.3.times.10.sup.-3 to 7.1.times.10.sup.-3 cal/cm.cndot.sec.cndot..degree. C. or a elastomer composition containing 50 to 200 parts by weight per 100 parts by weight of rubber.

Abstract: Disclosed are optical fibers for optical attenuation comprising a core and a cladding, wherein the cladding comprises two or more parts different from each other in their refractive indices and/or the attenuating dopant existence. By using the optical fibers for optical attenuation of the present invention, an optical attenuator which can effectively reduce the effect of cladding mode upon coupling of optical fibers and is excellent in characteristic stability can be manufactured at a low cost.

Abstract: An optical wireless communication method and apparatus configured to distinguish optical LAN data from optical noise is disclosed. The apparatus communicates using Manchester coded data via a connector connected to a personal computer. The Manchester coded data from the computer are converted to NRZ transmission data to be temporarily stored and read out. A frame of the read out data is appended with a head leader, and end data, at the head and end of the frame respectively to be convened to the DMI transmission optical data. The optical data inserted between the head leader and END data are receivable and can be distinguished from optical noise. The DMI received data removed from the head leader and end data are convened to data of the Manchester code in contrast with the transmission side to be delivered as the Manchester data via the connector. As the optical data with the head leader and end data are distinguishable from optical noise, high sensitive optical receivers are available.

Abstract: It is an object to effectively and rapidly damp vibration of a vibrating object. A vibration isolating supporter includes a coil spring (3) interposed between an upper frame (1) and a lower frame (2) which are opposed to one another in a vertical direction, and is characterized in that a partition panel (4) is provided for the lower frame (2) to surround a periphery of the coil spring (3), a damping material (5) is accommodated in a portion surrounded by the partition panel (4), and a resisting member is disposed to be suspended in a hollow hole of the coil spring (3) of the upper frame (1) so as to be immersed in the damping material (5).

Abstract: A tubular metal pipe and a solidified melt of a precursor of oxide superconducting material which is placed in contact with the metal pipe are subjected to heat treatment in an oxidizing atmosphere and at a temperature above the partial fusion temperature of the solidified melt to oxidize the metal pipe from its inside and outside and, as the oxidation proceeds, a melt of the solidified melt is effused through the tubular metal oxide layer to form a superconducting layer on its surface. This makes it possible to easily obtain a hollow oxide superconductor wherein a superconducting material layer is formed outside the metal oxide layer.

Abstract: A method for producing a Cu--Ag alloy based conductive material containing about 10% to about 20% at % Ag, that involves the steps of continuously casting the alloy into a rod followed by quickly cooling the rod, cold-working the rod to a reduction in area of 80% or more, then heat treating the cold-worked rod at a temperature of 250.degree. C. to 350.degree. C. for 1 hour or more to form a heat-treated rod, and thereafter cold-working the heat-treated rod to a reduction in area of 90% or more as defined based on the cast rod to produce conductive material having a high strength of 700 MPa or more and conductivity of 75% IACA or more.

Abstract: An apparatus for solid surface analysis capable of carrying out the X-ray fluorescence analysis of the sample surface according to the characteristic X-rays detected by the energy dispersive X-ray detector. The apparatus can also obtain an enlarged image of the sample surface according to the secondary electrons emitted from the excited sample surface detected by the electron detector. The apparatus can also carry out an X-ray diffraction analysis of the sample surface according to diffracted X-rays detected by the diffracted X-ray detector. The apparatus is also capable of attaching or detaching the energy dispersive X-ray detector easily by incorporating a connection room which can be put in a vacuum state independent of the vacuum chamber.

Abstract: An electromagnetic levitation type continuous metal casting apparatus includes a molten metal storing furnace for holding and storing a molten metal, a casting vessel for upwardly receiving and holding the molten metal in the form of an upwardly moving molten metal column, a displacer block for controlling supply of molten metal from the storing furnace to the casting vessel cooling means unified with the casting vessel and disposed around the outer periphery of the casting vessel for cooling and solidifying the upwardly moving molten metal column, alternating electromagnetic levitation and containment field generation means surrounding the casting vessel and cooling means disposed around the outer periphery thereof for generating an alternating electromagnetic field for electromagnetically levitating and containing the upwardly moving molten metal column while it is in the casting vessel, a molten metal supply path for supplying the molten metal to be cast from an inlet relatively high upon the side wall of

Abstract: Two or more rising pulse waves having different rates of voltage increase are applied to a measuring end of a cable and reflected waves from a fault point on the cable are detected to measure a turnaround propagation time between the measuring end and the fault point. Additionally, ratios of the rates of voltage increase of one pulse wave and the other pulse waves are calculated. A discharge delay time at the fault point is calculated from time differences of the measured turnaround propagation time and the ratios of the voltage increasing speeds and the discharge delay time is subtracted from the measured turnaround propagation time to calculate a real turnaround propagation time.

Abstract: An electromagnetic levitation type continuous metal casting apparatus is disclosed, which comprises a molten metal storing furnace for holding and storing a molten metal, a casting vessel for upwardly receiving and holding the molten metal in the form of an upwardly moving molten metal column, cooling means unified with the casting vessel and disposed around the outer periphery of the casting vessel for cooling and solidifying the upwardly moving molten metal column alternating electromagnetic levitation and containment field generation means unified with the casting vessel and disposed around the outer periphery thereof for generating an alternating electromagnetic levitation and containment field, the alternating electromagnetic field electro-magnetically levitation and containment the upwardly moving molten metal column while it is in the casting vessel, a tube shaped molten metal supply path for supplying the molten metal to be cast from the molten metal storing furnace to the casting vessel, and high fre

Abstract: An electromagnetic, levitation metal pipe casting method and system which provides an improved and simplified combined heat exchanger/levitator/containment coil assembly that comprises a single, outer multi-phase traveling wave coil structure and an inner solenoid coil structure. The outer, multi-phase traveling wave coil structure is positioned radially outside and coaxial with solidifing pipe during the casting process. The inner solenoid coil is positioned coaxial with and inside the pipe being cast. The outer multi-phase traveling wave coil and the inner solenoid coil are operated at substantially different frequencies and excitation current magnitudes. The improved system and method offer several functional and physical advantages over previous known levitation pipe casting systems. The principal improved features are:1. Simplified operating and control procedures.2. Simplified inner coil fabrication.3. Simplified electrical and coolant connections to the inner coil.4.

Abstract: A method of manufacturing a rubber or plastic-coated roller such as a fixing roller to be used in the thermal fixing part of an electrophotographic copying machine.

Abstract: An electrical signal transfer element is disclosed. This element consists of a ultrasonic wave solid propagation medium, input and output transducers and backing members. The ultrasonic wave solid propagation medium has a ultrasonic wave propagation distance which is shorter than a distance between main surfaces or a distance between side surfaces. The input and output transducers attached to ultrasonic wave signal input and output surfaces of the foregoing propagation medium serve to convert an input electric signal into a ultrasonic wave and to convert this ultrasonic wave into an output electric signal. The backing members are joined to surfaces opposite to joint surfaces of the input and output transducers to the propagation medium.

Abstract: A crosslinked polyolefin insulated power cable with remarkably improved AC breakdown voltage and impulse withstand voltage has been obtained by a process which comprises extrusion-coating, on the outer surface of a conductor, (1) a material for the formation of an inner semiconductive layer, comprising a base polymer and N-vinylcarbazole, (2) a crosslinkable polyolefin material for the formation of a crosslinked polyolefin insulating layer and (3) a material for the formation of an outer semiconductive layer in this order and then subjecting the coated conductor to a crosslinking treatment to form, on the outer surface of the conductor, an inner semiconductive layer, a crosslinked polyolefin insulating layer and an outer semiconductive layer in this order.

Abstract: The present invention relates to method for the production of a thermal fixing roller which comprises steps of applying a silicone rubber layer to the surface of a shaft, thereby forming a silicone rubber roller, applying a polytetrafluoroethylene coating to the surface of the silicone rubber roller by immersing the roller in a polytetrafluoroethylene dispersion and rotating the silicone rubber roller in a plane inclined with respect to a horizontal plane, removing the silicone rubber roller from the polytetrafluoroethylene resin dispersion, drying the coating on the outside of the silicone rubber roller at a temperature of at least 500.degree. C. for 10 to 120 seconds, preheating the coating from the inside of the silicone rubber roller, thereby elevating the temperature of the coating to a temperature which is less than that of the melting point of the polytetrafluoroethylene resin, and baking the coating to a temperature which is at least that of the melting point of the polytetrafluoroethylene resin.

Abstract: A cladding glass for optical fiber comprises 60 to 80% by weight of silicon dioxide (SiO.sub.2), 0.5 to 10% by weight of aluminum oxide (Al.sub.2 O.sub.3), 9 to 17% by weight of an alkali metal oxide, 3 to 15% by weight of boron oxide (B.sub.2 O.sub.3) and more than 0 but not more than 3% by weight of fluorine (F). The cladding glass of this invention can simultaneously satisfy low refractive index and lowered viscosity, and is also excellent in water resistance and weathering resistance.

Abstract: This invention concerns particularly a rubber or plastic-coated roller such as a fixing roller to be used in a thermal fixing part of an electrophotographic copying machine, and a method and an apparatus for production thereof.

Abstract: A heat-resistant prepreg uses at a substrate a heat-resistant material made of heat-resistant organic fibers, inorganic fibers, etc. and as a matrix a heat-resistant mixture containing at least 10% by weight of a borosiloxane resin composition. This heat-resistant prepreg is obtained by impregnating the substrate at a temperature in the range of 200.degree. to 300.degree. C. to such an extent that at least 20% of the amount of phenyl groups bonded to silicon atoms in the aforementioned borosiloxane resin composition prior to the impregnating and drying steps will remain after the heat treatment.