Abstract: A pump with magnetically-levitated rotor includes a position sensor having an eddy-current sensor coil that operates as a resonating element in a low frequency oscillator located within the pump housing. The oscillator is operably interconnected with additional electronics that shift the frequency of the oscillator output signal to a lower frequency. The lower frequency signal is directed to a frequency measurement circuit that provides a value representing a position of the rotor.

Abstract: Methods and system for providing secure emergency access to network devices. The methods and system described herein can be used to provide secure emergency access to network devices such as routers, telephony switching hubs, etc. Secure emergency access helps close security holes for providing access to configuration parameters in a network device by using an encrypted unit-unique password. The secure emergency access includes generating an encrypted emergency unit-specific password for a specific network device using a unique serial number for the specific network device and a global password used for a type of network device that includes the specific network device. The encrypted emergency unit-specific password is valid only on the specific network device with the unique serial number. The encrypted emergency unit-specific password is used to regain access to a specific network device for which an original password has been lost or misplaced.

Abstract: A method and system for automatically determining priority data streams on a computer network. A data traffic signature is calculated for a data stream using one or more of an average packet spacing, average packet size, average packet jitter or variation in packet size parameters calculated for data packets in a data stream. An optimized data signature can also be calculated for a data stream using one or more of an optimized average packet spacing, optimized average packet size, optimized average packet jitter or optimized variation in packet size parameters. A calculated data traffic signature is used to determine whether the calculated data traffic signature matches a known data traffic signature for a known type of data stream. If a calculated data traffic signature matches a known data traffic signature for a known type of data stream, such as a multimedia data stream, resources are allocated on a network device to provide a desired processing priority to data packets in the data stream.

Abstract: The flow rate of the drilling mud within a drill string is measured by measuring the doppler frequency shift in an acoustic signal propagated from a first acoustic transducer to a second acoustic transducer laterally separated from the first acoustic transducer. Each of the transducers are disposed within the principal flow of the drilling mud. The degree of doppler shift is a measure of the flow rate of the drilling mud between the two transducers. Variations in the flow rate of the drilling mud as measured by the transducers downhole are used to transmit information or commands from the well surface to a downhole microprocessor coupled to the output of the transducers.