A system is provided to recover unutilized energy as electric power in hydraulic turbine power generation. In the method, a database is provided in which, for at least one interventional instrument available for high-frequency thermoablation, a volume region for at least one high-frequency power generable with the instrument is established in which a thermoablation is achieved in a tissue with the instrument at this high-frequency power. A retaining-locking strip is formed of resilient material, and has an inner surface and an outer surface and at least one securing protrusion. The resulting exemplary non-limiting illustrative filters are stable, do not degrade over time, do not exhibit material delamination problems and offer superior transmittance for use as bandpass, band blocking and narrow-bandpass filters. The present invention further includes magnetic dynamic random access memory. During this BIST testing, the read andor write margins can be incrementally stressed until a failure point is determined for the cell.