1. The invention relates to a process for cleaning substrate with acoustic energy by using degassed wash liquor.

2. The radiolytic reduction of uranyl ions in degassed sulphuric acid solutions containing various organic solutes was studied.

3. Hot-rolled alloy steel plate, air hardened and tempered, produced to the "DIMO 42H" specification, or equivalent, made out of vacuum degassed steel.

4. Waste water is purified in that an aerated mixture of waste water with activated sludge is degassed before being discharged into the secondary settling basin.

5. Hot-rolled alloy steel plate, air hardened and tempered, produced to the "DIMO 42H" specification, made out of vacuum degassed steel, and imported under tariff code 7225.40.90.91.