摘要:
In order to incorporate oxygen into waters there is immersed therein at least one container or vessel which contains liquid oxygen. The oxygen is released into the water. The container is formed at least in part of a water soluble material, so that there results automatic release of the oxygen. Hence, oxygen can be introduced into deeper situated layers of the water without otherwise impairing the waters. With this equipment and technique there is avoided the need for complicated installations and there are not issued any emissions.
摘要:
A wall covering material comprising a front, decorative filled cover layer containing textile fibers and a rear foam plastic layer. The foam plastic layer contains flame-retarding additives, is elastic and gas pervious. Furthermore, it contains closed cell inorganic hollow spheres or small balls, which rigidify or stiffen the foam plastic layer, but do not unduly impair its restoring capability and also do not impair the insulation capability, sound absorption capability and flame resistance.