Abstract: The present invention is to provide a photocatalyst electrode for water decomposition exhibiting a high photocurrent density and having reduced dark current. The photocatalyst electrode for water decomposition of the present invention has a photocatalyst layer and a current collector layer that is formed by a vapor deposition method and is disposed on the photocatalyst layer.

Abstract: A digital image reproducing apparatus which can easily reproduce image and/or sound recorded by a digital still camera is disclosed. The apparatus has an input interface for inputting image data of the digital still camera. A converter converts the image data into displayable data. The apparatus further has a display for producing a visible image based on the displayable data.

Abstract: A hydrogen absorbing alloy is provided which is increased in reaction rate without being restricted in composition and which is unimpaired in the reversibility of reaction and hydrogen absorption-desorption cycle life characteristics. The alloy contains the phase of an intermetallic compound of the composition A5T19 wherein A is at least one element selected from the group consisting of La, Ce, Pr, Sm, Nd, Mm (misch metal), Y, Gd, Ca, Mg, Ti, Zr and Hf, and T is at least one element selected from the group consisting of B, Bi, Al, Si, Cr, V, Mn, Fe, Co, Ni, Cu, Zn, Sn and Sb. The alloy is produced by mixing together an alloy containing an AT3 phase and an alloy containing an AT4 phase, mechanically alloying the mixture to form the phase of intermetallic compound of the composition A5T19 in addition to the AT3 and AT4 phases, and subsequently mixing together or mechanically alloying the resulting alloy and an alloy containing AT5 phase.

Abstract: A tile holding device for presetting tiles comprises strip-shaped core members attachable to the inner surface of a form panel as arranged in parallel at a required spacing, long joint members made of elastic material and each mountable on the core member, and short joint members made of elastic material and to be arranged between and joined to each two adjacent long joint members. Preferably, the long joint member comprises a mounting portion in the form of an outwardly open channel, an inward projection projecting inward from the center of width of the mounting portion and having a specified height for forming a long joint, and a side projection projecting sidewise from each side of the inner end of the inward projection for engaging tiles.

Abstract: A method for sheet forming a remarkably waterproof gypsum hardened body, in which a main component consisting of gypsum dihydrate, slag and calcium hydroxide and additives are added with a part of the main component coated with a hydrophobic diorganopolysiloxane fluid having a kinetic viscosity of 10-10,000 CS at 25.degree. to be sheet formed and cured. The hydrophobic diorganopolysiloxane fluid is uniformly dispersed through the sheet formed gypsum hardened body and its strong water repelling property makes the gypsum hardened body remarkably waterproof to be used suitably as both interior and outdoor construction materials.