Abstract: A personal space warning assembly includes a mount for positioning on a person's head. A sensor is mounted on the mount and is configured to detect if a person is within a predetermined distance of the mount. A sound emitter is electrically coupled to the sensor and emits an audible sound when the sensor detects a person.

Abstract: A polyurethane foam sponge that picks up at least 80% of water in a wipe dry performance test is made by variably felting (compressing under heat and pressure) a foam sheet to a compression ratio of about 1.05 to 2.9. The resulting foam sponge has from 5% to 25% of its top and bottom surface portions modified by the variable felting, while its core portion remains substantially unmodified.

Abstract: A polyurethane foam sponge that picks up at least 80% of water in a wipe dry performance test is made by variably felting (compressing under heat and pressure) a foam sheet to a compression ratio of about 1.05 to 2.9. The resulting foam sponge has from 5% to 25% of its top and bottom surface portions modified by the variable felting, while its core portion remains substantially unmodified.

Abstract: A process for performing an enzyme-catalyzed reaction in a reaction mixture comprising two phases, a first aqueous phase containing an enzyme which is not accessible and a second substantially non-aqueous phase containing a non-water miscible solvent wherein a compound derived from fluorescein or a substituted fluorescein is present for the purpose of measuring aqueous pH by monitoring spectroscopic properties. Novel compounds derived from fluorescein or a substituted fluorescein which may be used in the process and a method for producing some of the novel compounds are also claimed.