Abstract: A device and method for covering a roof. The interlocking roof shingle includes a shingle having a top surface and a bottom surface. A first edge of the shingle is curved over the top surface and a second edge of the shingle is curved under the bottom edge of the shingle. The first edge of the shingle is configured to engage with the second edge of an adjacent shingle. The device further includes a tab configured to receive a nail and engage with the first edge of the shingle. Some embodiments of the shingle are configured to fit along the ridges and valleys of a roof. In these embodiments, the shingle has a center fold and a gap in the upper and lower folded edges.

Abstract: The disclosed technology can be used in the development and operation of multistatic probes that can characterize substances and relationships between substances. A multistatic probe can include transmitting and receiving conductive elements that are electrically distinct and which are capable of conveying electromagnetic energy to/from a substance of interest. The transmitting and receiving conductive elements can be arranged to be in contact with at least one dielectric mismatch boundary between substances of interest, whereby an electromagnetic signal transmitted on the transmitting conductive element causes a corresponding electromagnetic signal to be coupled to the receiving conductive element in response to the transmitted signal being in proximity to the dielectric mismatch boundary.

Abstract: A method of determining a temperature and a pressure in a tank is provided. The method comprises the steps of obtaining sensor data and calculating coefficients. Then, a bridge resistance is ratiometrically determined from a bridge voltage. A temperature is calculated with the coefficients and the bridge resistance. Thereafter, a transition from a temperature measurement mode to a pressure measurement mode is made. A voltage per resistance is calculated with the coefficients and a differential voltage. Then, a normalized voltage is calculated using the voltage per resistance, the differential voltage, and the bridge resistance to indirectly compensating for temperature. A pressure is calculated with the coefficients and the normalized voltage.

Abstract: A temperature and pressure measuring circuit is provided. The circuit comprises an uncompensated pressure transducer, an analog-to-digital converter, a reference resistive device, and first and second switches. The transducer has variable resistive devices between first, second, third, and fourth bridge nodes. The analog-to-digital converter has first and second reference inputs and first and second differential inputs. When the first switch couples the first differential input and the third bridge node and the second switch couples the second differential input and a ground, a bridge voltage is measurable and a bridge resistance is ratiometrically determinable. The bridge resistance is employed to calculate a temperature. When the first switch couples the first differential input and the first bridge node and the second switch couples the second differential input and the second bridge node, a differential voltage is measurable. The differential voltage is employed to calculate a pressure.

Abstract: A method, apparatus, and system for remotely monitoring a liquid level in a tank are provided by broadcasting a signal indicative of the liquid level in the tank directly to a cellular communication network from a stand-alone liquid level monitor operatively attached to the tank. The stand-alone monitor is battery powered and includes a processor configured for conserving power by operating the monitor according to a periodic sampling and broadcast schedule, which may be modified by signals received at the monitor directly from the cellular communications network.

Abstract: A waterproof and fog resistant gauge (10) includes a housing (12) forming a chamber (14) with a base (18) and opposing open end (16). The open-end (16) is enclosed by a bezel (60) compressing a pair of lenses (50, 52) spaced by a gasket (46) against and to the housing (12). The spaced lenses (50, 52) provides a "dead air" space between the lenses (50, 52) preventing air from entering or exiting. The housing (12) also includes an aperture (70) covered by an anaerobic filter (72) which allows the chamber (14) to breath while preventing water and other contaminants from entering the gauge (10).