Abstract: A parking enforcement device can be secured to a surface adjacent to the area designated as NO PARKING. The enforcement device can include an elongated hollow body, a window provided to the tubular body, a battery, an internal frame assembly disposed inside of the elongated hollow body, and a camera disposed inside of the elongated hollow body. The internal frame assembly defines a cavity in which the battery is located. A camera support pole extends vertically upwards from the internal frame assembly. The camera is secured to the camera support pole and located vertically along the camera support pole such that the camera views outward through the window. A solar panel can be provided atop the parking enforcement device to recharge the battery.

Abstract: A method and apparatus for generating a vapor/gas mixture includes storing a plurality of volatile liquids to provide the vapor component of the mixture, adding predetermined amounts of the volatile liquids and a dilution gas to a container, and thereafter removing the mixture to prepare a second vapor/gas mixture. In one approach, subsequent mixtures are prepared using different volatile liquids as the vapor component. Alternatively, a portion on the first vapor/gas mixture is removed from the container and then additional volatile liquid or dilution gas are added to the container to prepare a second vapor/gas mixture including the same vapor but at a different percentage in the mixture, or including additional vapors not used in the first vapor/gas mixture.

Abstract: A method for controlling centrifuges to improve solid-liquid separations, and particularly to achieve desired or optimal solids concentration in the concentrate discharge, is described. The method utilizes mass and solids balances on the centrifuge, together with measured and/or specified values for variables in the balances and for operating conditions of the centrifuge. The system further provides for the measurement of mass or solids concentrations of the concentrate and/or centrate streams as input for a feedback control system which adjusts the shot duration, shot interval or feed rate to modify operation of the centrifuge.