Abstract: When titanium oxide is doped with nitrogen, the resulting titanium oxide photocatalyst can be driven with visible light, which is a main component of sunlight. However, in a known process, since a high-temperature heat treatment process necessary for nitrogen doping degrades the photocatalytic activity inherent in titanium oxide, it is difficult to produce a titanium oxide photocatalyst that can be driven with a high efficiency under sunlight. A titania/organic substance composite, which includes an organic ligand coordinated to flaky titania and forms a layered structure, is immersed in aqueous ammonia to substitute the organic ligand between layers with a hydroxyl group by a ligand exchange reaction, and at the same time, to introduce ammonium into between layers of the titania having the layered structure. The resulting composite of titania and ammonium is heated at a temperature of 400° C.

Abstract: When titanium oxide is doped with nitrogen, the resulting titanium oxide photocatalyst can be driven with visible light, which is a main component of sunlight. However, in a known process, since a high-temperature heat treatment process necessary for nitrogen doping degrades the photocatalytic activity inherent in titanium oxide, it is difficult to produce a titanium oxide photocatalyst that can be driven with a high efficiency under sunlight. A titania/organic substance composite, which includes an organic ligand coordinated to flaky titania and forms a layered structure, is immersed in aqueous ammonia to substitute the organic ligand between layers with a hydroxyl group by a ligand exchange reaction, and at the same time, to introduce ammonium into between layers of the titania having the layered structure. The resulting composite of titania and ammonium is heated at a temperature of 400° C.

Abstract: A television system having two independently tuneable, simultaneously operating, channels contains a switching means for simultaneously displaying video from the two channels on a cathode ray tube for permitting comparison therebetween and independent comparative tuning thereof. In one embodiment, video from one of the channels is displayed in the top half of the screen and video from the second channel is displayed in the bottom half of the screen. Synchronizing signals from only one of the channels is used throughout the display in order to avoid disruption in synchronization due to switching back and forth between channels. In another embodiment of the invention, video from one of the sources is displayed in the first half of each horizontal line and video from the second source is displayed in the second half of each horizontal line. Thus, side-by-side comparison can be made of displayed video from the two sources.