Abstract: A magnetic resonance imaging method capable of discriminating the flow directions of fluids, such as bloodstreams, and suitable for MR angiography first selectively excites two side regions, which are located in the vicinity of a region to be imaged including fluids in an object to be examined, and which include first and second fluids flowing into the region to be imaged along different directions, by using RF pulses (90.degree. pulses) different from each other in phase by 90.degree.. A spin in one side region is rotated to the x'-axis direction in a rotating coordinate system, and that in the other side region is rotated to the y'-axis direction in the system. A 180.degree. pulse is applied to the region to be imaged to invert the polarity of a spin, thereby generating MR signals. The acquired MR signals are subjected to quadrature detection, and MR images are reconstructed for both a real-part component and an imaginary-part component different from each other in phase by 90.degree..

Abstract: A method and apparatus for carrying out a roving bobbin exchange operation when applied to a conventional ring spinning frame. The roving bobbin exchange operation is simultaneously carried out on a plurality of successive pairs of a front bobbin hanger and a back bobbin hanger of the creel portion of the spinning frame by intermittently displacing the operation unit along the spinning frame and by utilizing a plurality of pairs of a first sub-peg unit having a front peg and a back peg, and a second sub-peg unit having a front peg and a back peg unit, whereby a roving bobbin mounted on the front peg of the first sub-peg unit can be transferred to the back peg of the second sub-peg unit, and vice versa, during the exchange operation, and thus the unit roving bobbin exchange operation can be carried out in a very limited space defined by twice a pitch between two adjacent pairs of a front bobbin hanger and a back bobbin hanger facing the first bobbin hanger.

Abstract: A method of nuclear magnetic resonance angiographic imaging capable of reducing an imaging operation time.

Abstract: A magnetic resonance imaging apparatus disclosed by this invention has a magnet assembly including a static magnetic field coil, a gradient magnetic field coil, an excitation coil, and a detection coil. A magnetic resonance signal detected by the detection coil is subjected to image reconstructing processing to obtain an image. The excitation coil can generate an exciting radio frequency pulse magnetic field for causing magnetic resonance excitation of a plurality of regions of an object to be examined simultaneously. Such an exciting radio frequency pulse magnetic field is formed by a mixed carrier having a plurality of carriers of different center frequencies.

Abstract: A magnetic resonance imaging system selectively excites a plurality of predetermined first regions of an object to cause an magnetic resonance, selectively excites at least one predetermined second region intersecting the first regions to cause an magnetic resonance before the magnetic resonance is relaxed, collects a magnetic resonance signal, and acquires a magnetic resonance image of the second region based on the magnetic resonance signal.

Abstract: A method and an apparatus of setting multi-slice imaging conditions in computed tomographic imaging systems capable of taking a desired multi-slice imaging in a desired imaging region without scanning imaging. In the method and apparatus, an object to be imaged is illuminated along at least one projection plane and within at least one projection area corresponding to an imaging region; the projection area is changed and detected; one of the multi-slice imaging conditions including an imaging time interval, a slice thickness, and a number of slices is specified; and a remaining part of the multi-slice imaging conditions is determined in accordance with the part of the multi-slice imaging conditions specified by the specifying means and the detected projection area.

Abstract: In a magnetic resonance imaging apparatus, there are provided: an MR (magnetic resonance) imaging unit having an imaging hole at a substantially central portion thereof, into which an object under medical examination is inserted; a superconducting coil unit stored within an outer vessel which is positioned around the imaging hole, and including a superconducting coil assembly for uniformly producing a static magnetic field to be applied to the object, and at least one heat shield tube or thermally shielding the superconducting coil assembly stored therein; a gradient field coil assembly provided between the outer vessel and imaging hole; for producing a gradient magnetic field so as to be superimposed with the static magnetic field.

Abstract: An avalanche transistor has a heterojunction emitter-base junction. The avalanche transistor includes a spacer layer provided between an emitter layer and a base layer. The spacer layer has an energy band gap between that of the base layer and that of the emitter layer, a carrier concentration lower than that of the base layer, and a thickness so that the whole spacer layer becomes a depletion layer at thermal equillibrium so that a neutral region is produced in the spacer layer at a voltage lower than the threshold voltage of the emitter-base junction. Thus, the same element is both bistable with the base current as a parameter and has an S-shaped negative differential resistance with the base voltage as a parameter.

Abstract: A semiconductor laser device includes an active layer, a first semiconductor layer having a larger energy band gap than the active layer, a diffraction grating layer having a larger energy band gap than the active layer and a smaller energy band gap than the first semiconductor layer, and a second semiconductor layer having the same composition as the first semiconductor layer, successively grown on the active layer, parallel stripe grooves of predetermined period reaching the first semiconductor layer produced at the entire surface of the grown layers, a cladding layer having the same composition as the first semiconductor layer which is re-grown thereon, and a diffraction grating constituted by the remainder of the diffraction grating layer. The coupling coefficient of the light is determined by the film thickness of a layer produced between the active layer and the diffraction grating layer, and the amplitude of the diffraction grating is determined by the layer thickness of the diffraction grating layer.

Abstract: A man-powered boat propulsion device comprising a hand rod reciprocated horizontally by rowers, a vertical support rod moveably suspended from and slidably supporting the hand rod on a sliding support, an operation rod pivoted to the hand rod, a vertical shaft interlocked with the operation rod and capable of rotating clockwise and counter-clockwise, a fin blade secured to the shaft and capable of horizontally rotating both rightward and leftward alternately, a handle a connected to the hand rod, a change-over device connected to the handle and capable of transmitting a turning movement of the handle either clockwise or counter-clockwise changeably, and a direction control device connected between the change-over device and the shaft for transmitting the handle turning movement. Easy boat propulsion and steering is possible even of unskilled persons.

Abstract: A high frequency filter for an electric instrument including a casing of metallic conductive material, an internal electric circuit element arranged within the casing, and a connector mounted on a peripheral wall of the casing for connecting the internal electric circuit element to an external electric circuit. The high frequency filter comprises an insulation substance layer arranged between the connector and a connection terminal of the circuit element, the insulation substance layer being made of a dielectric material whose dielectric constant decreases or increases in accordance with increase or decrease of wireless frequency applied thereto, and a pair of conductive layers formed on opposite surfaces of the insulation substance layer, one of the conductive layers being connected at one end thereof to the connector and at the other end thereof to the connection terminal of the circuit element, and the other conductive layer being connected to a portion of the casing.

Abstract: Disclosed is a magentic resonance imaging apparatus which comprises a transmission probe head, a reception probe head, and inclined magnetic field coil means. The transmission probe head applies a high-frequency magnetic field to a subject, while the reception probe head receives magnetic resonance signals from the subject. The inclined magnetic field coil means generates and applies an inclined magnetic field to the subject. If the inclined magnetic field is applied to the subject, the magnetic resonance signals detected by the reception probe head are provided with generative position information. An electromagnetic coupling prevention member is interposed between the coil means and the transmission and reception probe heads. The prevention member includes a plurality of high-conductivity portions and a plurality of electrically discontinuous portions electrically separating the high-conductivity portions from one another.

Abstract: Three dimensional vibration of an object can be measured based on the light generated by a light source and the light reflected on a conical concave reflective surface disposed on the object. Measurement of the vibration is performed by using a measuring device for measuring frequency deviation of the reflected light and a device for measuring deviation of reflection position of the reflected light.

Abstract: A transparent optical cable 5 including a flexible core 5a and a flexible but stiffer cladding 5b transmits light signals axially through the core. When a transparent contact plate 7 or roller 10 depresses and flatteningly distorts the cable, the light signals leak out through the core-cladding interface at the depressed portion and are transmitted through the plate or roller to a photoelectric transducer 8 or 12 mounted on the plate or proximate the roller on a movable object 1, which converts the light signals to electrical signals. Signal transmissions into the cable are also possible, and the input-output signal coupling depression may be made at any point along the length of the cable.

Abstract: A case for accommodating an electronic circuit for an electronic control system mounted on a vehicle is formed of an electric conductor and is electrically isolated from the grounding terminal of the electronic circuit which is provided on a printed substrate. Further, the outer boundary of a signal line for signal transmission between the electronic circuit and external circuits or sensors of the case is connected to the case through capacitors, thus preventing the faulty actuation of the electronic control system which otherwise might be caused by the electromagnetic wave.

Abstract: A water leakage monitoring system has a carriage remotely controlled with a driving control signal to intermittently travel along an inspection rail, a plurality of discrete monitored members disposed adjacent to the inspection rail, an industrial color television camera hung from the carriage through an attitude adjusting mechanism so as to correctly oppose and monitor water leakage through each of the monitored members through the operation of the attitude adjusting mechanism in response to an attitude control signal, and a coating composition applied to the surface of each of the monitored members which changes in color when it is wet with water leaked through the associated monitored member.

Abstract: An NMR diagnostic apparatus capable of obtaining tomographic images in any direction and in any portion of the patient. A magnetic device applies a static magnetic field along a longitudinal axis of the patient. A first coil device is arranged along this longitudinal axis and applies a first gradient magnetic field in conjunction with the static magnetic field so as to define a slice in the patient which is to be examined. The first coil device also applies at least one second gradient magnetic field which defines a projection angle from which NMR signals are obtained. A probe head coil device applies RF pulses to excite nuclei in the slice and to detect the NMR signals emanating from the slice. A second coil device is arranged along the longitudinal axis and applies to the slice a shifting magnetic field which shifts a magnetically-zero plane of the first gradient magnetic field in a direction perpendicular to the magnetically-zero plane.

Abstract: An abnormal noise detector for use in evaluating the quality of automotive gear units or the like is disclosed. The present invention employs a microphone which picks up the noise produced by a gear unit being tested and an adjustable bandpass filter connected to the microphone which passes only those signals from the microphone having a desired frequency, the desired frequency being a function of the rate of rotation of the gear unit. The bandpass filter is controlled by a proportional amplifier responsive to the rate of rotation of the gear unit which at any rate of rotation of the gear unit causes the bandpass filter to pass only the desired frequency. The filtered output from the bandpass filter is applied to an X-Y recorder which automatically plots the sound pressure of the noise having the desired frequency as a function of the rate of rotation of the gear unit or as a function of the desired frequency.

Abstract: A method of estimating water leakage position is estimated in such a manner that at least two leakage water collection ports are provided at the bottom part of a containment vessel, that a leakage water sensor is provided at each of said leakage water collection ports, and that a position within a horizontal plane of the position where the water leakage has occurred in said containment vessel is estimated with a signal from the leakage water sensor and the positions where said leakage water collecting ports are provided.

Abstract: In an NMR imaging apparatus, the steady magnetic field is subjected to be deformed. The first shim coil pair is wound on a common bobbin and has a common diameter. The second shim coil pair is wound on the same bobbin and has the same diameter as that of the first shim coil pair. The first shim coil pair corrects homogeneity of the field components of the steady magnetic field having even-numbered higher order terms in the longitudinal axis of the object under examination. The second shim coil pair corrects uniformity of the magnetic field components of the steady magnetic field in the direction perpendicular to the longitudinal axis and also uniformity of the magnetic field components of the first coil pair in the direction perpendicular to the longitudinal axis.