Abstract: A audiovisual program image is displayed on a display panel, and the audiovisual program image is enlarged by a lens and then incident to the eye balls of a user, whereby the virtual image corresponding to the audiovisual program image is observed on the eye balls of the user. Further, a perception image to make the user perceive the distance to the virtual image corresponding to the audiovisual program image and the size of the virtual image is displayed at the surrounding portion of the display portion of the audiovisual program image on the display panel, and the perception image is also enlarged by the lens and then incident to the eye balls of the user, whereby the virtual image corresponding to the perception image can be observed on the eye balls of the user.

Abstract: A method for selectively capturing metal ions by treating a solution conting ions of heavy metals, such as cupric ions, zinc ions, etc., at an adjusted pH value with a metal capturing agent comprising a condensation product of a higher fatty acid or derivative thereof with an excess of a polyamine, for example, a condensation product of decanoic acid and a polyamine. Heavy metal ions contained in effluents from mines and factories are selectively captured and separated according to this method.

Abstract: Metal ions are effectively eliminated from aqueous solutions containing the ame by treating the solution with a metal sequestering agent which is a condensation product of a higher alkyl halide with a polyamine.