Abstract: An acoustic transducer system for projecting and sensing acoustic waves or sound in fluid is disclosed in accordance with the present disclosure and figures herein. The system includes a transducer array of a plurality of channels, each channel having an inlet and an outlet, and a reservoir containing a liquid solution. A first electrode is disposed proximate to the inlet and a second electrode is disposed proximate to the outlet. A voltage source, connected to the first and second electrodes, is configured to apply voltage across a length of the array of the channels to generate an electric field parallel to each channel. The electric field causes an electroosmotic flow of ions from the reservoir to the outlet, producing a plurality of acoustic waves or sound at the outlet. A method for projecting and sensing acoustic waves or sound in fluid using the acoustic transducer system is also disclosed herein.

Abstract: An acoustic transducer system for projecting and sensing acoustic waves or sound in fluid is disclosed in accordance with the present disclosure and figures herein. The system includes a transducer array of a plurality of channels, each channel having an inlet and an outlet, and a reservoir containing a liquid solution. A first electrode is disposed proximate to the inlet and a second electrode is disposed proximate to the outlet. A voltage source, connected to the first and second electrodes, is configured to apply voltage across a length of the array of the channels to generate an electric field parallel to each channel. The electric field causes an electroosmotic flow of ions from the reservoir to the outlet, producing a plurality of acoustic waves or sound at the outlet. A method for projecting and sensing acoustic waves or sound in fluid using the acoustic transducer system is also disclosed herein.

Abstract: A method and apparatus useful in the application of linerless labels to surfaces of elements is provided in a methodology so that conventional linered label applicators can be used with linerless labels. A source of linerless labels is provided comprising a composite of an elongate sheet of reusable, temporary liner having adhered to a low adhesion surface of said reusable, temporary liner an adhesive face of a precut linerless label, the composite possibly being in a roll.

Abstract: A water cart for suspension of a water bucket for use in concrete finishing work employs an elongated open frame oriented substantially horizontally relative to a ground support surface and which extends in a substantially horizontal direction away from a wheel axle at one end toward a handle affixed at an opposite end. A bucket or container is pivotally suspended between the wheel axle and handle from the upper free ends of a generally U-shaped bracket that also serves as a ground support for the cart. Tool supports disposed at the wheel end of the open frame, which are generally cylindrical and adapted to receive and support long-handled work tools. The bucket's intermediate placement on the frame and pivotal suspension from the bracket allow the bucket to remain in a generally upright position, even when the cart is rested on an inclined surface, thus preventing tipping and spillage.