Abstract: An optical fiber cable includes a cable core including a plurality of optical fibers, a tensile strength member disposed along the cable core, and a sheath covering the cable core and enclosing the tensile strength member. The tensile strength member includes an exposed portion exposed from the sheath to an inside of the cable core. In a cross-sectional view of the optical fiber cable, the exposed portion includes a portion in which a line segment intersects an outer periphery of the tensile strength member, the line segment connecting a center of the tensile strength member and a center of the optical fiber cable.

Abstract: An optical fiber cable includes a plurality of optical fibers, a cable sheath covering the plurality of optical fibers, and a plurality of tension members embedded in the cable sheath. The plurality of tension members are arranged almost without gaps along a circumferential direction of the optical fiber cable to surround the plurality of optical fibers.

Abstract: The present disclosure relates to an optical fiber cable that includes a plurality of optical fibers; a cable sheath covering the plurality of optical fibers; and a plurality of tension member groups embedded in the cable sheath, in which each of the plurality of tension member groups includes a plurality of tension members, the plurality of tension members are not in contact with each other, the plurality of tension member groups are arranged along a circumferential direction of the cable sheath in a cross section perpendicular to an axial direction of the optical fiber cable, and adjacent tension member groups among the plurality of tension member groups are separated from each other.

Abstract: An optical cable according to an embodiment of the present disclosure is an optical cable for installation in a microduct, the optical cable including one or more optical-fiber core wires, and a sheath layer covering an outer peripheral side of the one or more optical-fiber core wires. The sheath layer has a density of 2.0 g/cm3 or less. The sheath layer contains an olefin-based resin, a silicone, and a non-halogen flame retardant. A mass ratio of the non-halogen flame retardant to the olefin-based resin is 0.90 to 2.00. A mass ratio of the silicone to the olefin-based resin is 0.005 to 0.100. The olefin-based resin contains a polyethylene, and an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer. The silicone has a weight-average molecular weight of 50,000 to 1,000,000.

Abstract: A method for laying an optical fiber cable including a cable core, a cable sheath that includes an inner jacket and an outer jacket, and a tensile strength member, a first kinetic friction coefficient of the outer jacket being smaller than a second kinetic friction coefficient of the inner jacket to the duct, first flame retardance of the inner jacket being higher than the second flame retardance of the outer jacket. The method includes wiring the optical fiber cable in an outdoor side via the duct, drawing the optical fiber cable from the outdoor side to an indoor side, making a part of the optical fiber cable as an optical fiber cable for indoor wiring by removing the outer jacket after the drawing of the optical fiber, and wiring the optical fiber cable for indoor wiring in the indoor side.

Abstract: An optical fiber unit includes an optical fiber ribbon in which a plurality of optical fibers are arranged in parallel, and a colored bundle tape which is longitudinally wrapped or spirally wrapped around an optical fiber ribbon bundle in which the plurality of optical fiber ribbons are stranded together. One end portion in a width direction of the bundle tape and the other end portion in the width direction of the bundle tape overlap each other and are joined to each other, and the bundle tape covers an entire circumference of the optical fiber ribbon bundle.

Abstract: An optical fiber unit includes an optical fiber ribbon in which a plurality of optical fibers are arranged in parallel, and a colored bundle tape which is longitudinally wrapped or spirally wrapped around an optical fiber ribbon bundle in which the plurality of optical fiber ribbons are stranded together. One end portion in a width direction of the bundle tape and the other end portion in the width direction of the bundle tape overlap each other and are joined to each other, and the bundle tape covers an entire circumference of the optical fiber ribbon bundle.

Abstract: When conductive particles are dispersed beyond the percolation threshold, electric conductive paths are formed between the electrode by chains of particles contacting with each other between the electrodes. Elongation of this composite results in an increase in the gap distances between conductive particles. This results in the increase in the electric resistance of the composites. It is found that strain sensors can be made by the use of this nature. Strains of iron frames or iron-concrete are known by the change of electric resistance of the sensors which are set on a surface of the place to be monitored. Main fields of the application of the present sensors are safety monitoring systems for buildings, bridges, tunnels, dams, etc. The sensors are also applicable for tanks of chemicals, aircraft, ships and mega-floats.

Abstract: A neutral particle analyzer has a stripping cell for converting a neutral beam into a charged particle beam, a momentum analyzer for deflecting paths of respective charged particles of the charged particle beam emerging from the stripping cell in correspondence with momenta thereof, and a semiconductor energy analyzer comprising a plurality of semiconductor detectors which are arranged in the paths of deflected charged particle beams emerging from the momentum analyzer. The semiconductor energy analyzer generates pulse signals having pulse heights corresponding to masses of and kinetic energies of the deflected charged particles of the deflected charged particle beams.