Abstract: A fiber grid reinforcement is of a flat shape and has first and second directions perpendicular to each other. The fiber grid reinforcement includes a plurality of first fiber bundles, a plurality of second fiber bundles, and a resin material. The first fiber bundles are generally disposed along the first direction and generally parallel to one another. Each of the first fiber bundles includes at least one first group of fibers. The second fiber bundles are generally disposed along the second direction and generally parallel to one another. Each of the second fiber bundles inbcludes at least one second group of fibers. The second fiber bundles intersect perpendicular to the first fiber bundles at intersecting sections so as to form a grid structure. The first group and the second group of fibers are layered alternately at the intersecting sections in such a manner that at least one outermost layer is the second group. The resin material bonds fibers in each group, and bonds the groups to one another.

Abstract: According to a method and an apparatus for measuring a water content, a thermal conductivity of a measurement target is measured, and a water content of the measurement target is calculated from the thermal conductivity in accordance with prepared data which represents correlation between a thermal conductivity and a water content of the measurement target. A water content management system controls the water content in accordance with the actual water content. If the water content is excessive, it is informed by an alarm system.

Abstract: A cold storage structure including: a storage chamber for storing articles, the storage chamber including a ceiling, a pair of side walls and a bottom wall, at least both the side walls and the bottom wall being formed in the ground; a heat accumulating layer arranged in the ground to surround at least both the side walls and the bottom wall, the accumulating layer being adapted for cooling the storage chamber; and a plurality of heat pipes mounted on the ground to extend in the heat accumulating layer to a position below the bottom wall for heat exchanging with the heat accumulating layer to cool the storage chamber.