Abstract: A heat distribution system, method and computer program product, including an unpressurized tank configured for holding a heat transfer fluid; and one or more submersible heat transfer fluid pumps configured to pump the heat transfer fluid to one or more heat load loops respectively connected to the one or more heat transfer fluid pumps.

Abstract: A system and method for providing full-duplex data communications between an electric power distribution station and a power consumer via the power distribution line providing electric power is provided. A first information transmitter, coupled to the power distribution circuit, provides first information signals concurrently with the power signal to the power consumer via the power distribution line. A first information receiver, coupled to a power consumer device powered by the electrical power signal, receives the first information signals via the electric power distribution line. A second information transmitter coupled to the power consumer device provides second information signals concurrently with the electrical power signal. A second information receiver, coupled to the power distribution circuit, receives the second information signals via the electric power distribution line.

Abstract: A system and method for providing full-duplex data communications between an electric power distribution station and a power consumer via the power distribution line providing electric power is provided. A first information transmitter, coupled to the power distribution circuit, provides first information signals concurrently with the power signal to the power consumer via the power distribution line. A first information receiver, coupled to a power consumer device powered by the electrical power signal, receives the first information signals via the electric power distribution line. A second information transmitter coupled to the power consumer device provides second information signals concurrently with the electrical power signal. A second information receiver, coupled to the power distribution circuit, receives the second information signals via the electric power distribution line.

Abstract: A system and method for providing full-duplex data communications between an electric power distribution station and a power consumer via the power distribution line providing electric power is provided. A first information transmitter, coupled to the power distribution circuit, provides first information signals concurrently with the power signal to the power consumer via the power distribution line. A first information receiver, coupled to a power consumer device powered by the electrical power signal, receives the first information signals via the electric power distribution line. A second information transmitter coupled to the power consumer device provides second information signals concurrently with the electrical power signal. A second information receiver, coupled to the power distribution circuit, receives the second information signals via the electric power distribution line.

Abstract: A system and method for providing full-duplex data communications between an electric power distribution station and a power consumer via the power distribution line providing electric power is provided. A first information transmitter, coupled to the power distribution circuit, provides first information signals concurrently with the power signal to the power consumer via the power distribution line. A first information receiver, coupled to a power consumer device powered by the electrical power signal, receives the first information signals via the electric power distribution line. A second information transmitter coupled to the power consumer device provides second information signals concurrently with the electrical power signal. A second information receiver, coupled to the power distribution circuit, receives the second information signals via the electric power distribution line.

Abstract: A quick connect power line metering and communication apparatus and method for measuring energy consumption or other electrical characteristics on a power line and for communicating the measured information to a remote location. The apparatus includes a housing, and a coupling mechanism attached to the housing to physically connect the housing to a suspended portion of the power line, and to provide an electrical connection to at least one conductor of the power line. A metering apparatus is provided within the housing, and is electrically coupled to the power line conductors via the coupling mechanism to measure energy consumption. The metering apparatus includes a current monitor and a voltage monitor to measure the energy consumption on the power line. A communications apparatus is provided within the housing, and is electrically coupled to the metering apparatus. The communications apparatus communicates information corresponding to the measured energy consumption to a remote location.

Abstract: A system and method for providing full-duplex data communications between an electric power distribution station and a power consumer via the power distribution line providing electric power is provided. A first information transmitter, coupled to the power distribution circuit, provides first information signals concurrently with the power signal to the power consumer via the power distribution line. A first information receiver, coupled to a power consumer device powered by the electrical power signal, receives the first information signals via the electric power distribution line. A second information transmitter coupled to the power consumer device provides second information signals concurrently with the electrical power signal. A second information receiver, coupled to the power distribution circuit, receives the second information signals via the electric power distribution line.

Abstract: The invention provides a layered modulation data communication systems characterized by numerous, asynchronous data transmitters operating on a power line. Data is modulated onto relatively low frequency subcarriers. Subcarriers are used to modulate carriers centered on a common frequency. The subcarriers are frequency division multiplexed. Data is recovered by demodulating the subcarriers from the carriers and subsequently demodulating the data from the subcarriers.

Abstract: A data transmission system for power line carriers includes a transmitter which generates a stable carrier frequency at a bandwidth of less than one hertz. The transmitter is connected to the power line to transmit the generated frequency over the power line to a receiver. The receiver implements filters of a bandwidth of one hertz or less to attenuate any signals that do not correlate with the generated frequency. Information on the phase of the power line to which the transmitter is connected is represented in the form of a generated signal which modulates the stable frequency generated by the transmitter on the power line. The receiver is located on another portion of the power line and compares the phase information from the transmitter with the phase of the power line to which the receiver is connected and displays the resulting comparison for interpretation.

Abstract: The present invention relates to spring conductors used within modular jack assemblies. The spring conductors electrically connect with conductors residing on a multi-connector plug to connect communication equipment, digital or audio, to a transmission line. The spring conductors maintain connection with the conductors on the plug by a spring force inherent in the spring conductor. The present invention measures this spring force with a probe inserted into the modular jack assembly. The output of the probe being proportional to the spring force.

Abstract: This invention concerns a target determining apparatus that has particular application to a navigation system for an automated guided vehicle. The target determining apparatus has a laser diode light source which is scanned toward retroreflective targets. A photoreceptor in the apparatus detects reflected light returning from a target. The light source is modulated at either a constant or binary-coded frequency. Signals from the photoreceptor are demodulated in accordance with the chosen modulation scheme, resulting in a markedly improved signal-to-noise ratio. This permits either increased amplification of the signal or a reduced threshold for determining a valid target signal. In either case, the range of the apparatus is increased, without increasing the power of the light source, because weaker signals from more distant targets can be reliably distinguished from background noise.

Abstract: A voltage amplifying device that is compensated to reduce variations in its output voltage due to changes in temperature or supply voltage by means of two transistors connected together so that changes in the base-emitter voltage of one transistor are counteracted by similar changes in the base-emitter voltage of the other transistor.