Abstract: An infrared transmissivity measurement method is for measuring an infrared transmissivity of a quartz glass crucible which includes a transparent layer made of quartz glass that does not contain bubbles, a bubble layer formed outside the transparent layer and made of quartz glass containing bubbles, and a semi-molten layer formed outside the bubble layer and made of raw material silica powder solidified in a semi-molten state. The infrared transmissivity measurement method includes processing an outer surface of the quartz glass crucible formed by the semi-molten layer to lower a surface roughness of the outer surface; and measuring an infrared transmissivity of the quartz glass crucible based on infrared light passing through the outer surface after processing the outer surface.

Abstract: A quartz glass crucible 1 having a cylindrical side wall portion 10a, a bottom portion 10b, and a corner portion 10c includes a transparent layer 11 as an innermost layer made of quartz glass, a semi-molten layer 13 as an outermost layer made of raw material silica powder solidified in a semi-molten state, and a bubble layer 12 made of quartz glass interposed therebetween. An infrared transmissivity of the corner portion 10c in a state where the semi-molten layer 13 is removed is 25 to 51%, the infrared transmissivity of the corner portion 10c in the state where the semi-molten layer 13 is removed is lower than an infrared transmissivity of the side wall portion 10a, and the infrared transmissivity of the side wall portion 10a in the state where the semi-molten layer 13 is removed is lower than an infrared transmissivity of the bottom portion 10b.

Abstract: A fiber-flexure-substrate tray for transporting and protecting optical modules and optical module components. The fiber-flexture substrate tray may have a tray body for supporting an optical fiber and other components coupled to the optical fiber while the optical fiber and the other components are processed. In addition, the fiber-flexure-substrate tray may have a thermally conductive substrate holder coupled to the tray body for heat-treating other components coupled to the optical fiber. The tray body may have a support area designed to hold the optical fiber off of the thermally conductive substrate holder to thermally isolate the optical fiber. In addition, a component may be coupled to the tray to hold the optical fiber off of the thermally conductive substrate holder.

Abstract: A fiber-flexure-substrate tray for transporting and protecting optical modules and optical module components. The fiber-flexture substrate tray may have a tray body for supporting an optical fiber and other components coupled to the optical fiber while the optical fiber and the other components are processed. In addition, the fiber-flexure-substrate tray may have a thermally conductive substrate holder coupled to the tray body for heat-treating other components coupled to the optical fiber. The tray body may have a support area designed to hold the optical fiber off of the thermally conductive substrate holder to thermally isolate the optical fiber. In addition, a component may be coupled to the tray to hold the optical fiber off of the thermally conductive substrate holder.

Abstract: A tunnel lining process and an apparatus for use in the process in the prior art are improved in order to greatly enhance a lining speed and to facilitate the work of placing concreate for lining. The improvements reside in that a pressing form for pressing a tunnel concrete lining and a side form to be positioned on the side of the pressing form opposite to an already placed concrete lining are constructed as separate bodies in distinction from the prior art. After the pressing form and the side form have been disposed along an excavated surface of a tunnel, lining concrete is placed in a space delimited by the both forms, the excavated surface and the already placed concrete lining so as to press the lining concrete onto the excavated surface to be lined.