Abstract: A composite material is capable of suppressing decrease in the strength, which is caused by bending of fibers of a skin material during the time when the composite material is cured. A composite material is provided with a honeycomb core, a first skin material, a second skin material, a thunder-resistant mesh and a resin material; and the resin material is not arranged in a neighborhood portion which is the region corresponding to the region at the front end of the honeycomb core. A first film adhesive is arranged between the first skin material and the honeycomb core; a second film adhesive is arranged between the second skin material and the honeycomb core; and a fourth film adhesive is arranged in the neighborhood portion of the resin material in a weight per square meter, which is lower than those of the first film adhesive and the second film adhesive.

Abstract: Vapor-liquid contacting equipment includes a contact column in which a test liquid flows from top to bottom and a vapor flows from bottom to top, a rotary shaft which is inserted vertically in the contact column, rotors which are provided at different heights on the shaft, and which convert the test liquid into a thin film by centrifugal force and then discharge the test liquid from the outer periphery thereof, and trays which receive the test liquid discharged from an upper rotor and guide the test liquid to the center of a lower rotor. The rotors have furrows, which the test liquid flows over when the filmy test liquid flows out from the center of the rotor towards the outer periphery.

Abstract: The device of the invention comprises; a contact column 1A in which a test liquid flows from top to bottom and a vapor flows from bottom to top, a rotary shaft 9 which is inserted vertically in the contact column 1A, rotors 10 which are provided at different heights on the shaft, and which convert the test liquid into a thin film by centrifugal force and then discharge the test liquid from the outer periphery thereof, and trays 20 which receive the test liquid discharged from an upper rotor and guide the test liquid to the center of a lower rotor. The rotors 10 have furrows 13, which the test liquid flows over when the filmy test liquid flows out from the center of the rotor towards the outer periphery.

Abstract: A three color separation/synthesis mirror device includes a housing, four dichroic mirrors which are arranged in the housing and cross with each other at right angles to form an X-shape, and a liquid filled in the housing so as to submerge the respective dichroic mirrors. A refractive index of the liquid is higher than that of the dichroic mirrors. A correction prism for making an emergent light in parallel to an incidental light may be located in a corner on the incidental side of the X-shaped dichroic mirrors. Double image blurs due to the entrance rays can be obviated. Also, such a characteristic that the refractive index of the liquid is lowered when the liquid is heated, is utilized so that the refractive index of the liquid becomes close to the refractive index of the glass.

Abstract: A three color separation/synthesis mirror device for a liquid crystal projector comprises four dichroic mirrors whose joint part has a V-shaped notch in which a higher refractive index is filled thereby to eliminate stray lights. The device may have a prism at the joint part for causing an emitted light to be parallel with an incident light.

Abstract: A cooling device has a container filled with a coolant. A front side and a rear side of the container are transparent. A heatsink is provided for cooling the container. A liquid crystal panel is attached to one of the sides. Convection enhancing means is provided for enchancing convection of the coolant in the container.