Abstract: A surface coil for use in MRI data acquisition systems wherein the surface coil has the capability of operating as a quadrature coil and of supporting two independent current moles enabling tuning to two separate frequencies.

Abstract: The invention is a method for isolating a sample of oilfield production without shearing the sample, which includes a multistep method of using a chamber to isolate a sample of fluid from a flowline by transferring the sample from the flowline without a significant pressure drop. This involves placing a valved isolation chamber in fluid communication with a sampling port of an oilfield production flowline, the isolation chamber consists of a closed vessel, a first entry port into the vessel, and a first exit port out of the vessel controlled by a first valve. The sampling port valve is opened while the first valve of the isolation chamber is closed to permit pressure within the isolation chamber to equalize with pressure within the flowline. The first valve is then opened to permit oilfield production to pass from the flowline through the sampling port and the first entry port into the isolation chamber and out of the first valve.

Abstract: A nuclear magnetic resonance tomography apparatus has a coil for generating a basic magnetic field, a gradient coil and measuring coils. A capacitor arrangement precisely adjusts the resonance of the measurement coil to the basic field coil. An iron-free dc motor is disposed within the field generated by the basic field coil for physically adjusting the plates of the capacitors connected in the circuit including the measurement coil. The rotor and coils of the iron-free dc motor are disposed within the basic magnetic field such that the basic magnetic field functions as the stator field for operating the motor.

Abstract: An automatic impedance adjuster for an MRI system has an impedance adjusting section, an oscillator, a detector, and a controller. The impedance adjusting section is provided to a probe head, and allows variable adjustment of real and imaginary parts of an impedance of the probe head. The oscillator has a predetermined output impedance, and supplies a signal to the probe head. The detector is connected between the probe head and the oscillator, and outputs detection signals respectively corresponding to real and imaginary parts of the impedance of the probe head. The controller supplies a control signal to the impedance adjusting section in response to the signals corresponding to the real and imaginary parts obtained from the detector, and performs control such that the real and imaginary parts of the impedance of the probe head coincide with a predetermined impedance.

Abstract: A nuclear magnetic resonance signal is collected from a target by using a special pulse sequence which is repeated and, between various repetitions, the relative temporal ratio of signal collection and excitation events is changed. The pulse sequence consists e.g. of the following actions: a target zone is first excited with a so-called 90.degree. pulse followed by coupling of magnetic field gradients in a manner that re-excitation of the target with a 180.degree. pulse serves to generate a so-called spin echo, which is stored and during which at least one magnetic field gradient is turned on. If the purpose is to image a three-dimensional target, e.g. the first excitation event can be effected by using so-called selective excitation and by using a gradient pulse orthogonal to the direction of a read gradient for phase encoding a nuclear system.

Abstract: Abnormal conditions of a tank type gas circuit breaker are detected by driving a movable contact with a drive force and at a speed respectively lower than normal drive force and speed. Measuring units are mounted on various portions of a casing of the circuit breaker without disassembling the same and measured data are displayed for comparison.

Abstract: Disclosed is an abnormal pulse detector for use with a particle analyzing apparatus of the Coulter.RTM. type for generating discrete particle pulses in response to liquid suspended particles passing through a sensing aperture, the abnormal pulse detector comprising: a bad pulse detector for generating a bad count pulse for each of the particle pulses which have a width that is either too long or too short, comparative pulse detector means for generating a comparative count pulse for each of the particle pulses or for each of the particle pulses not generating a bad count pulse, counter and comparator circuitry for counting the bad count pulses and the comparative count pulses and for obtaining the ratio of the bad count pulses to the comparative count pulses so as to indicate a alarm condition when the ratio reaches a predetermined, unacceptable level.

Abstract: A charge level sensor in which the distance between the sensor and a sample to be sensed is maintained constant and the sensor is entirely protected from strain or contamination by foreign matter and is reduced in size. A rotary drum of aluminum is provided with plural recesses therein in which are disposed charge sensors, preferably MOS FET's. Holes are formed though the substrate leading into the recesses through which pass lead wires coupled to the sensors. The surface of the substrate, including the sensors, is covered by an electric-charge retaining layer such as a photosensitive material or a dielectric material.

Abstract: A cereal grain moisture content measuring apparatus including a vessel for containing a sample of cereal grains to be measured for its moisture content formed with a discharge valve at its bottom, an electrostatic capacity sensor mounted on an inner wall surface of the vessel, a weighing device connected to the vessel and a grain feeding device mounted above the vessel. Electric circuits of the weighing device and the grain feeding device are operatively connected to an electric circuit of the sensor through a control circuit. The weighing device is adapted either to measure the weight of a predetermined volume of cereal grains, or to measure the weight of a predetermined weight of cereal grains and produce a signal to actuate a volume measuring section provided to said vessel to determine the volume of the cereal grains of the predetermined weight.

Abstract: Information about the plasma density profile in an aerodynamic flow field of plasma adjacent a supersonic space vehicle or test model is provided by a flush mountable plasma density profile probe device having at least three striplines embedded in and separated by a dielectric support member from a conducting ground plane therebelow. In operation, the device is affixed flush and conformally to the surface of the space vehicle or test model. The plasma density profile is determined from a plot of data points derived from sequential measurements, in the plasma flow field environment, of the conduction between a driven stripline and parallel flush embedded additional striplines in the order of the nearest stripline to the furtherest stripline from the driven stripline. Standard formulas can be applied to determine the data points.