Abstract: A network analyzer for measuring a group delay time, which is caused by a device under test to be measured, generates an excitation signal comprising two signals (xIn1(t),xIn2(t)) spaced by a frequency difference, excites the device with the excitation signal and measures a response signal comprising two signals (xOut1(t),xOut2(t)), which are respectively phase distorted by the device relative to the signals (xIn1(t),xIn2(t)) of the excitation signal. It determines the phase difference (??In) between the signals (xIn1(t),xIn2(t)) associated with the excitation signal and a phase difference (??Out) between the signals (xOut1(t), xOut2(t)) associated with the response signal. Finally, it calculates the group delay time from the phase difference (??In) of the signals (xIn1(t),xIn2(t)) associated with the excitation signal, the phase difference (??Out) of the signals (xOut1(t),xOut2(t) associated with the response signal and the frequency difference.

Abstract: A balanced drumstick system and method permanently reposition the longitudinal center of gravity of a plurality of wood drumsticks to common new specified location to create custom sets of balanced wood drumsticks. The system and method automate the repositioning of the longitudinal center of gravity of wood drumsticks to increase accuracy and to decrease time to create sets of custom wood drumsticks.

Abstract: A measurement device, which communicates data to at least one system, and which has the capability of identifying measurement data returned by the system via the data communication as its own, and the capability to rule out manipulation of measurement values without use of a public or non-personal key. The measurement device includes at least an encryption and/or signature encoder that supplies information including a validity and reliability identifier for inspecting the integrity of the data, and compiles said information into a current data set and transfers it to at least said communication interface for transfer, and at least an encryption and/or signature decoder that inspects data sets returned via the communication interface using one or more keys in memory for integrity of data content and identification of the measurement device and, upon successful inspection of this data, supplies said data for further processing, evaluating or displaying.

Abstract: A system and method for determining electrical properties using Magnetic Resonance Imaging (MRI) are provided. One method includes determining a magnitude of an MRI B1+ field applied to an object, determining a phase of the MRI B1+ field applied to the object and combining the determined magnitude and phase to determine a complex B1+ field estimate. The method further includes estimating one or more electrical properties of the object using the complex B1+ field estimate by directly solving at least one difference equation.

Abstract: An apparatus state detector and its associates are provided to save time and effort for learning combinations of operation states of all apparatuses at home and commit fewer estimation errors even when an unknown apparatus starts operating. The apparatus state detector includes measuring means that measures a physical quantity of an environment in which an apparatus is placed, feature-quantity calculation means that calculates a feature quantity of the measured value measured by the measuring means, storage means that stores in advance the feature quantity of each apparatus and an apparatus state associated with the feature quantity in a reference-apparatus entry dictionary, and apparatus-state detection means that searches the reference-apparatus entry dictionary for a feature quantity by using a feature quantity calculated by the feature-quantity calculation means as a search key and detects an apparatus state based on the apparatus state associated with the retrieved feature quantity.

Abstract: In a solar cell evaluation device 1, a spectral sensitivity P(?) of a solar cell 2, which is a measurement object, is measured in advance. When the solar cell 2 is evaluated, a spectral irradiance L (?) of illumination light is measured, generated power EL of the solar cell 2 that is generated with the illumination light is measured, and the measured generated power EL of the solar cell 2 is converted into generated power ES generated by the solar cell 2 in the case of illumination with illumination light with a spectral irradiance S(?) based on the reference solar light. Therefore, since the calibration in the solar cell evaluation device 1 is performed with software, the calibration can be performed in a simple manner and at a low cost even when the solar cell type is changed.

Abstract: An integrated circuit is presented. The integrated circuit includes a selection circuit that selects a reference voltage and an output voltage associated with a number of adjustable voltage regulators connected to the selection circuit. The integrated circuit also has an analog to digital converter, which converts the selected output voltage and the reference voltage to a digital representation. An analog state machine of the integrated circuit receives the digital representation from the analog to digital converter and compares the selected output voltage with the reference voltage.

Abstract: A method and a system for a comprehensive analysis of low frequency oscillation. The method includes: firstly, initiating a wide area measurement system WAMS (71) to perform real-time monitoring; transmitting real-time low frequency oscillation information to a dynamic early-warning system (72) periodically; then converting the low frequency oscillation information received by the dynamic early-warning system (72) into an input file for stability calculation with small disturbance, and performing related calculation; finally, transmitting the calculated result back to the wide area measurement system WAMS (71) and a human-machine system interface for output. The system includes: the wide area measurement system WAMS (71), the dynamic early-warning system (72), a system for stability calculation with small disturbance (73) and an output system (74).

Abstract: An optical measurement apparatus, comprising a reference support on which are mounted a fixed headstock and a movable tailstock opposed to the fixed headstock and movable in order to maintain a piece to be measured between headstock and tailstock, and a mobile carriage movable along the linear axis, the carriage carrying a light source for directing a beam of collimated light across the x axis to be interrupted by the piece under measurement, the carriage further carrying an optical detector aligned with the light source and arranged to receive the residual light of the beam of collimated light that has not been interrupted by the piece under measurement. The measuring apparatus has a automatic measure mode triggered by a button on the apparatus, that is arranged to automatically guess the features of a workpiece and/or recognize workpieces for which a measurement program is available.

Abstract: A system and method for soft-field reconstruction are provided. One method includes obtaining applied input and measured output information for an excited object using a plurality of transducers and forming an admittance matrix based on the applied input and measured output information. The method also includes determining a plurality of moments using the admittance matrix and calculating a property distribution of the excited object using the plurality of moments.

Abstract: Methods of controlling a variable speed wind turbine generator connected to a power grid. The method may include measuring the frequency, f, of the power grid, controlling the speed of the generator for optimizing the power delivered to the power grid, and setting limits for the generator speed. The setting of the limits for the generator speed is performed in dependency of the measured frequency of the power grid. This provides a dynamical set of limits providing improved possibilities of optimizing the power production.

Abstract: An apparatus and method process optical coherence tomography (OCT) imaging data from a sample. The method includes using a magnitude spectrum and an estimated phase term of a complex spatial Fourier transform of a complex intermediate function to generate an estimated complex spatial Fourier transform. The method further includes calculating an inverse Fourier transform of the estimated complex spatial Fourier transform and calculating an estimated intermediate function by applying at least one constraint to the inverse Fourier transform. The apparatus includes a partially reflective element configured to reflect a first portion of light and to allow a second portion of light to propagate through the partially reflective element and to reflect from the sample. The apparatus further includes a detector that measures the OCT power spectrum in response to the first and second portions of light.

Abstract: A method of predicting serum phosphorus concentrations in a patient during hemodialysis includes measuring serum phosphorus concentrations of the patient over a hemodialysis treatment session time and an ultrafiltration rate calculated by a difference between pre- and post-dialytic body weight of the patient during an initial hemodialysis treatment session divided by a total treatment time of the treatment session and estimating a phosphorous mobilization clearance and a pre-dialysis distribution volume of phosphorus for the patient. Serum phosphorus concentrations of the patient can then be predicted at any time during any hemodialysis treatment session with the estimated phosphorous mobilization clearance and pre-dialysis distribution volume of phosphorus of the patient.

Abstract: During fault detection of a production process, the influence of the data communication process for communicating measurement readings to the fault detection system may be taken into consideration. In one illustrative embodiment, a data rate related parameter may be used as an input variable for a data reduction procedure, thereby enabling an efficient assessment of the quality of the remaining “real” process and tool parameters.

Abstract: Described herein are methods, systems, apparatuses and products for phase determination in an electricity grid. An aspect provides for determining phase for at least one electric grid device via receiving power consumption measurements derived from electricity grid devices connected in the electricity grid, comparing, over a series of time intervals, a total power consumed; and determining a phase for at least one electricity grid device.

Abstract: A reference measurement object having known properties is used for the purpose of calibrating a coordinate measuring machine. A plurality of reference measured values are picked up on the reference measurement object. Calibration data are determined using the reference measured values and using the known properties of the reference measurement object. The calibration data comprises a first number of polynomial coefficients that are selected to correct nonlinear measuring errors using at least one polynomial transformation. The first number of polynomial coefficients is reduced in an iterative method to a lesser second number, with a plurality of pairs of polynomial coefficients being formed and with a polynomial coefficient of a pair being eliminated in each case when a statistical dependence between the polynomial coefficients of the pair is greater than a defined threshold value.

Abstract: A downmixing device includes: a matrix conversion unit configured to perform a matrix operation for an input signal; a rotation correction unit configured to rotate an output signal of the matrix conversion unit; a spatial information extraction unit configured to extract spatial information from the output signal of the rotation correction unit; and an error calculation unit configured to calculate an error amount of the matrix operation result for the input signal by performing a matrix operation for the output signal of the rotation correction unit and the spatial information extracted by the spatial information extraction unit using a matrix that is inverse to the matrix used for the matrix operation by the matrix conversion unit.

Abstract: Subterranean formation locations/heights of tagged proppant doped with a high thermal neutron capture cross-section material are determined using data obtained from before and after frac logging passes through a well of a logging tool having near and far neutron detectors. Proppant location inaccuracies arising from changes in lithology between a zone of no interest and a proppant-containing formation zone are made, after any required normalization for a between-log change in borehole fluid, using an observed difference between the near/far detector count rate ratios in the two passes to determine a count rate differential correction to be applied to the before frac detector count rate. The corrected before frac count rate log is then overlaid with the after frac count rate log such that suppression in the after frac count rate log relative to the corrected before frac count rate log indicates the presence of proppant.

Abstract: A non-transitory computer-readable recording medium stores a magnetic program causing a computer to perform an exchange coupling energy calculating process including interpolating a rotation angle between two magnetization vectors disposed at the respective centers of two adjacent elements used in a finite volume method with reference to a rotation axis perpendicular to the two magnetization vectors, and calculating a magnetic exchange coupling field by integrating a magnetic field acting as a force exerted on the two magnetization vectors with the interpolated rotation angle.

Abstract: Systems and methods for thermal gradient compensation for ring laser gyroscopes are provided. In one embodiment, a method for producing bias compensated angular rate measurements from a ring laser gyroscope comprises: sampling an angle measurement output from a laser block sensor to obtain an angular rate measurement; obtaining an laser block temperature measurement (Tblock) for the laser block sensor; obtaining a temperature gradient measurement (Tdiff) for at least one gradient line across a portion of the laser block sensor; calculating a rate bias error by applying parameters produced from the temperature measurement (Tblock) and the temperature gradient measurement (Tdiff) to a thermal gradient compensation model, wherein the thermal gradient compensation model includes at least one coefficient corresponding to the temperature gradient measurement (Tdiff); and calculating a difference between the angle rate measurement and the rate bias error to produce a bias compensated angular rate measurement.