Abstract: A method for estimating one or more properties as a function of depth of an earth formation penetrated by a borehole includes: receiving nuclear magnetic resonance (NMR) logging data having NMR echo trains as a function of depth in the borehole; receiving non-NMR logging data having non-NMR measurement values for one or more types of non-NMR measurements as a function of depth in the borehole; generating an evolution matrix (E) representing a mathematical relationship between the one or more properties in property matrix (P) to be estimated and the NMR logging data and non-NMR logging data matrix (M); generating a matrix equation of the form M=E·P; and inverting the matrix equation to estimate the one or more properties as a function of depth.

Abstract: Methods and apparatus for identifying a process corner are provided. Provided is an exemplary method for identifying a process corner of an integrated circuit (IC). The IC has a first asymmetrical ring oscillator (ARO1) including pull-up transistors that have a low threshold voltage (LVT) and pull-down transistors that have a regular threshold voltage (RVT), and has a second asymmetrical ring oscillator (ARO2) including pull-up transistors that have an RVT and pull-down transistors having an LVT. The exemplary method includes applying an ultra-low power supply voltage to the ARO1 and the ARO2 that causes the integrated circuit to operate near a verge of malfunction, measuring an output frequency of the ARO1, measuring an output frequency of the ARO2, calculating a calculated ratio of the output frequency of the ARO1 and the output frequency of the ARO2, and comparing the calculated ratio to a fiduciary ratio to identify the process corner.

Abstract: Systems and methods according to these exemplary embodiments provide for methods and systems related to optical current sensors used to monitor standby power transformers, specifically fiber optical current and voltage sensors and, more particularly, to applications involving filters for use in such sensors, such as frequency tracking comb filters. According to one embodiment, a method for monitoring a connection condition of a stand by power transformer includes the steps of measuring a current flowing through a high voltage side of the standby power transformer using at least one optical current sensor disposed proximate to a current flow path of the high voltage side, using a comb filter to filter the measured current, determining whether the filtered, measured current is less than a predetermined threshold value; and generating an alarm indication that the high voltage side of the standby power transformer is unconnected.

Abstract: Magnetic resonance imaging (MRI) systems and methods to effect MRI data acquisition with reduced noise are described. A readout gradient, having a first polarity used to acquire and store MRI data in k-space memory during analog-to-digital conversion (ADC) of MR RF signals during one TR interval, is continued at substantially a same amplitude and vector direction and used as an image volume selection gradient during a transmitted RF excitation pulse that begins a next TR interval before the readout gradient transitions to an opposite polarity. The acquired k-space data is then used to generate an MR image.

Abstract: An exemplary magnetic flux sensor in accordance with the present invention is characterized by an electrical output that is proportional to the total static and dynamic flux passing normally through a large area. An oscillating electrical current passing down a conducting area produces Lorentz forces, which are transferred to piezoelectric areas. The piezoelectric areas produce electrical voltage at the oscillation frequency whereby amplitude is proportional to the total magnetic flux passing normally through the conducting area. Demodulating the voltage provides an electrical signal with high sensitivity, dynamic range, and noise immunity.

Abstract: A sensor including a measuring assembly integrating at least one magnetoresistive element having a stack of two conductive magnetic layers, respectively reference and sensitive, the reference layer having magnetic anisotropy in the direction X and the sensitive layer having a direction Y, a polarization permanent magnet having a surface extending in a plane of directions X and Y and having a symmetry plane of directions X and Z, the measuring assembly being disposed with respect to the symmetry plane of the polarization magnet so that the layers of the magnetoresistive element are disposed in a plane parallel to the surface while being offset from said plane in the direction Y by a distance (?y) that is arranged so that the magnetic field of the polarization magnet orients the magnetisation of the sensitive layer in the direction Y.

Abstract: A system (100, 200) is presented. The system includes a fluid lifting device (102, 202) located inside a well (106, 206), and comprising an electrical motor (108, 208), a three phase cable (114, 214) for coupling the fluid lifting device to a power source (112, 212), at least one high sensitivity differential current transformer (104, 203, 204) for generating imbalance signals (128, 227) representative of an imbalance current in at least one of the electrical motor and the three phase cable, wherein the at least one high sensitivity differential current transformer is disposed such that the at least one high sensitivity differential current transformer surrounds at least a portion of the three phase cable, and a processing subsystem (136, 236) for monitoring the health of at least one of the fluid lifting device and the three phase cable based on the imbalance signals.

Abstract: A power supply includes a first and second electric storage sections, a first sensor detecting a first current of charge/discharge of the first storage section, a second sensor detecting a second current of the charge/discharge of the second storage section, and a circuit module having a control section to determine a state of the first sensor, the second sensor, and/or a third sensor detecting a third current of a driving section by comparing a first current with a third current in a charge/discharge between the first storage section and the driving section, and/or a second current with the third current in a charge/discharge between the second storage section and the driving section, and by comparing the first current with the second current and the first current with the third current in the discharge of the first storage section to the second storage section and the driving section.

Abstract: A microcontroller-based system for measuring the impedance of a device under test (DUT) (35) responsive to a square wave stimulus. A clock generator circuit (26) in the microcontroller (20) generates a clock signal at a base clock frequency. A first timer (25) divides down the base clock frequency by a first frequency divisor integer to set the stimulus frequency of a square wave generated by a general purpose input/output (GPIO) function (24), and a second timer (28) divides down the base clock frequency by a second frequency divisor integer to set the sampling frequency of an analog-to-digital converter (ADC) (30). A discrete Fourier transform executed by a processor (22) is used to determine the impedance of the DUT at the stimulus frequency. The first and second integers are selected so that aliased harmonics fall in different DFT bins from the fundamental tone.

Abstract: A device is disclosed that includes a control circuit, a scope circuit and a time-to-current converter. The control circuit configured to delay a voltage signal for a delay time to generate a first control signal, and to generate a second control signal according to the first control signal and the voltage signal. The scope circuit configured to generate a first current signal in response to the second control signal and the voltage signal. The time-to-current converter configured to generate a second current signal according to the first control signal and the voltage signal.

Abstract: A device for monitoring vacuum quality of a vacuum circuit breaker, the device including at least one rigid assembly including a first stationary conductive surface that is separated by an insulating layer from a second stationary conductive surface that is grounded. The assembly forms a first capacitor having a fixed value, the first stationary conductive surface being arranged opposite an electrically active portion of the vacuum circuit breaker to form, together with the portion, a second capacitor, and an electronic circuit for measuring a variation in voltage of the first capacitor that is representative of a change in state of the vacuum of the circuit breaker.

Abstract: Provided is an electromagnetic wave power sensing apparatus. The electromagnetic wave power measuring apparatus includes a waveguide to which electromagnetic wave power is incident, an electromagnetic wave absorber disposed at a termination of the waveguide and absorbing the electromagnetic wave power incident to a front surface of the electromagnetic wave absorber, parallel plates disposed at a rear of the electromagnetic wave absorber and arranged on and under a center line of the waveguide, a waveguide guide for fixing the waveguide and the electromagnetic wave absorber, wherein the parallel plates are positioned in the waveguide guide, an electro-optic element configured to sense the electromagnetic wave power, an electro-optic element fixer to which the electro-optic element is coupled, and a movement guide coupled to the electro-optic element fixer and controlling movement of the electro-optic element into the inside of the waveguide guide in order to sense the electromagnetic wave power.

Abstract: A system includes applying, to patient tissue, a first imaging sequence comprising first balanced gradient pulse trains and RF pulses, where phases of successive RF pulses in the first imaging sequence differ by a first pulse phase increment, detecting first signals emitted from the patient tissue in response to the first imaging sequence, and to generate a first image based on the first signals, applying, to the patient tissue, a second imaging sequence comprising second balanced gradient pulse trains and RF pulses, where phases of successive RF pulses in the second imaging sequence differ by a second pulse phase increment different from the first pulse phase increment, detecting second signals emitted from the patient tissue in response to the second imaging sequence, and to generate a second image based on the second signals, applying motion-correction processing to the first image to generate a first motion-corrected image, applying motion-correction processing to the second image to generate a second mot

Abstract: A number n of Hall elements of a position detecting device output analog detection signals responsive to magnetism from a magnet of a piston. A number n of AD converters carry out analog to digital conversion to convert the analog detection signals into digital detection signals. A ladder circuit receives, as an n-bit digital signal, the digital detection signals output from a number n of magnetic detectors, and performs digital to analog conversion thereof into a single analog output signal. A control IC detects an approximate position of the piston on the basis of the single analog output signal that is input thereto.

Abstract: An electromagnetic impedance sensing device includes a substrate, a first patterned conductive layer, a second patterned conductive layer, a magneto-conductive wire and an encapsulation layer. The substrate has a surface and a trench extending into thereof. The first patterned conductive layer is formed on the surface, as well as a bottom and sidewalls of the trench. The magneto-conductive wire is disposed in the trench. The second patterned conductive layer extending across the trench and electrically in contact with the first patterned conductive layer is formed on the first patterned conductive layer to make the magneto-conductive wire sandwiched between the first and the second patterned conductive layers. The magneto-conductive wire is encapsulated by the encapsulation layer to make the magneto-conductive wire electrically isolated from the first and second patterned conductive layers.

Abstract: Devices and corresponding methods can be provided to test an ionization gauge, such as a hot cathode ionization gauge, for leakage currents and to respond to the leakage currents to improve pressure measurement accuracy. Responding to the leakage current can include applying a correction to a pressure measurement signal generated by the gauge based on the leakage current. Responding to the leakage current can also include removing contamination causing the leakage current, where the contamination is on electrical feedthrough insulators or other gauge surfaces. Testing and correcting for leakage currents and removing contamination can be completed with the ionization pressure gauge in situ in its environment of use, and while the gauge remains under vacuum.

Abstract: Example apparatus and methods provide improved quantitative T2 mapping for magnetic resonance imaging (MRI). Conventional T2 (spin-spin) mapping in MRI may employ a spin echo with multiple echoes (SEMC) approach like the Carr-Purcell-Meiboom-Gill (CPMG) spin echo sequence. These conventional approaches may be negatively impacted by a slice profile effect that incorrectly and undesirably lowers the signal of a first echo and by a stimulated echo effect that incorrectly and undesirably raises the signal for even echoes. Example apparatus mitigate these issues by using a T2 preparation phase that uses three dimensional (3D) non-slice selective block RF pulses followed by a multi-echo data acquisition that uses an in-out k-space trajectory. The multi-echo acquisition may employ k-space segmentation to acquire one line of partition encodings per T2 preparation phase.

Abstract: An apparatus and methods for compensating for spatial non-uniformities in solar simulators. This is accomplished in part by acquiring a spatial map of the intensity distribution that the solar simulator produces across the illumination plane using a reference cell, identifying an area of an arbitrary solar cell within the illuminated area, and then calculating the expected illumination levels for that solar cell in that specific location based on the spatial mapping. The results of that process can then be used to determine the efficiency of the arbitrary solar cell during a test in which the reference cell (of known efficiency), located in a different part of the illuminating beam, simultaneously measures the illumination in one area of the illumination beam.

Abstract: An electromagnetic field analysis method for an anisotropic conductive material involves using an analysis grid having a first side and a second side that are orthogonal to each other to analyze an electromagnetic property of an anisotropic conductive material in which conductivity in a first direction is different from conductivity in a second direction. One or both of the first direction and the second direction are parallel to a direction different from either one of the first side and the second side of the analysis grid. One electromagnetic field component located on the first side and extending along the second side is calculated based on electromagnetic field components that are located on a plurality of the second sides surrounding the one electromagnetic field component and that extend along the second sides.

Abstract: A precise and versatile hybrid sensor system and method of use that senses the location of a movable element traveling along a linear path. The system includes a magnetostrictive sensor along with a tried and proven converting mechanism that converts the linear movement of the movable element to rotational movement and then to a greatly reduced linear movement of a magnet that is directly proportional to the movement of the movable element. The magnetostrictive sensor has a sensor probe having an active length that is in close proximity and parallel to the movement of the magnet such that the magnetostrictive sensor can sense the location of the magnet to determine the location of the movable element. The magnetostrictive sensor is located exterior to the vessel to eliminate wiring within the vessel itself so as to allow the hybrid sensor to be readily used in difficult, high pressure or subsea environments.