Abstract: A spherical inorganic powder having, in a particle size frequency distribution, a first peak having a local maximum value in a particle size region from 0.1 ?m or larger to 0.6 ?m or smaller, and a second peak having a local maximum value in a particle size region from 1.5 ?m or larger to 5.0 ?m or smaller, wherein a value of a ratio of a frequency at the local maximum value of the second peak to a frequency at the local maximum value of the first peak is 1.5 or higher and lower than 10.0.

Abstract: An inorganic powder having a volume-based cumulative 50% diameter D50 of 1.2-2.8 ?m, having a volume-based particle size frequency distribution that includes at least a first peak and a second peak located on a larger-particle-diameter side of the first peak, wherein the first peak has a half-width smaller than 0.5 ?m.

Abstract: A tire vulcanization system is configured to deliver a vulcanized tire carried out from a vulcanizer by a tire conveyance device to a PCI device at a first position, and attaches an upper lid. The PCI device mounted with the upper lid is moved from the first position to a second position by a PCI moving portion. The tire conveyance device is configured to receive the raw tire disposed above the PCI device moved to the second position and carry the raw tire into the vulcanizer.

Abstract: A method for manufacturing a photonic crystal fiber including arranging a spacer formed of two or more spacer parts in a support tube such that the inner wall surface of the support tube has a substantially regular polygonal cross-sectional shape which allows closest packing of a core rod and a plurality of capillaries or the capillaries only; and forming a preform by packing in a support tube the core rod for forming a solid core and the capillaries for forming a cladding, or by providing a core space for forming a hollow core in a support tube and packing in the support tube a plurality of capillaries for forming the cladding; and drawing the preform into a fiber under heating.

Abstract: A method for manufacturing a photonic crystal fiber (20) including the steps of: arranging a spacer (4) formed of two or more spacer parts in a support tube (3) such that the inner wall surface of the support tube (3) has a substantially regular polygonal cross-sectional shape which allows closest packing of a core rod (2) and a plurality of capillaries (1) or the capillaries (1) only; and forming a preform (15) by packing in a support tube (3) the core rod (2) for forming a solid core and the capillaries (1) for forming a cladding, or by providing a core space for forming a hollow core in a support tube (3) and packing in the support tube (3) a plurality of capillaries (1) for forming the cladding; and drawing the preform (15) into a fiber under heating.