Abstract: A method serves for recording nuclear resonance spectra of test samples having at least three groups of spins. A first group is coupled to a second group, while a third group is uncoupled relative to the second group but has a spectral position, e.g. chemical shift, which is substantially identical only to that of the first group. For obtaining an isolated image of the signal of the first group, one suppresses the signal of the third group. A pulse sequence of three r.f. pulses (10, 13, 22) are irradiated upon the sample in a manner known as such. The second r.f. pulse (13) is applied in such a way that the magnetization of the spins of the first group is transferred to the spins of the second group by polarization transfer. Then, a first magnetic gradient field pulse (17, 23), with dephasing effect for the spins of the said second group, is exerted upon the sample. The third r.f.

Abstract: A leg exercise device for permitting isolated exercises of selected muscle groups of the lower extremity comprising a generally tubular ankle collar or boot having an inner surface conformingly fitted to a user's ankle region. The outer forward facing surface of the ankle boot includes an upturned J-shaped hook member adapted to receive a weight clip member. The weight clip member includes means for retainingly engaging a rod or bar portion of a conventional weight, such as a dumbbell, and is lockable to the hook member of the boot. The boot includes front and back half portions which are hinged together along a first common side and which have an adjustable buckle member for closing the two halves together along their second common side. The front half portion of the boot includes a anti-torsion strap member which is looped under the ball of the user's foot to prevent up and down and side-to-side or torsional movement during use.

Abstract: The gas pressure control apparatus and method for detection of leaks in pressurized pipelines disclosed herein measures thermally compensated leak rates. The apparatus uses a pressure vessel and gas pressure control system to precisely determine leak rates.

Abstract: An improved water based aerosol paint is particularly well-suited for use in site marking applications. Its high content of calcium carbonate provides a support for the pigment and resin film. A straight chain, low molecular weight hydrocarbon with between 5 and 8 carbons is used to control foaming.

Abstract: A wheeled riding apparatus having as a base embodiment a flexible skateboard including a flat board member, a pair of trucks and an elliptical leaf spring member. The leaf spring member is attached to each truck and is curved to support the flat board member when the weight of a rider is placed upon the board. The flat board member can be made thin and flexible, and, in combination with the leaf spring, allows an agile rider to perform dramatic stunts. In an alternative embodiment, a scooter having a board member with a sunken center section, a pair of trucks, a leaf spring with a compound curve and a T-handle is shown. The scooter incorporates the flexible board and leaf spring combination of the skateboard and lowers the center of gravity of adding a sunken midsection to the board to enhance rider stability and control. The added handle also aids in rider stability.

Abstract: Method and apparatus for electro-optically modulating the intensity of an incident light beam including a coupling prism with a high reflective index, a semiconductor substrate in optical contact with the coupling prism and having a conductive area formed therein, an organic electro-optic film formed on the substrate and covering at least a portion of the conductive area, and a transmission line disposed above the electro-optic film and cooperating with the conductive area to form electrodes for use in applying an electric field across the electro-optic film. Light directed through the substrate by the coupling prism couples with surface plasmons at the film-to-metal interface and is selectively reflected or absorbed depending upon whether or not an electric field is applied.

Abstract: A shock-activated lock for attachment to a cabinet that prevents the cabinet door from opening in the event of an earthquake. The lock includes a slotted engaging member attached to the cabinet door, and a lock housing attached to the cabinet frame that contains a ball that normally rests on a raised shelf. The engaging member extends into the housing when the door is closed. In the event of an earthquake, the ball falls into the slot in the engaging member, preventing the engaging member from withdrawing from the housing, thus preventing the cabinet door from opening.

Abstract: The improved device for measuring liquid-level changes in storage tanks uses a float to track vertical displacement of the surface of a liquid and a linear variable differential transducer (LVDT) sensor positioned below the surface of the liquid to measure changes in the surface level. The center of gravity of the device is located below the center of buoyancy, thereby minimizing instability of the LVDT sensor.

Abstract: A method for operating submerged submarines and a submarine are disclosed which are used to camouflage submerged submarines which, while submerged and travelling, draw a trail of heated cooling water behind themselves. In order to reduce the risk of detection of such submerged submarines by means of heat-sensitive detectors, either the density of the heated cooling water is increased through the introduction of additives, or, the heated cooling water is brought, by mechanical means, to a depth far below the submarine for preventing heated-up cooling water to rise up to the sea surface.

Abstract: An underwater vehicle is disclosed being equipped with a passive optical observation system. The underwater vehicle has an observation window at its disposal which exhibits a diameter in the range from 0.3 to 3.0 m and a curved surface. In order to increase the sensitivity of the passive optical observation system and the ability to detect distant objects, the observation window is part of the passive optical observation system. The entrance pupil of the observation system exhibits a diameter in excess of 0.1 m.

Abstract: A nuclear magnetic resonance tomograph comprises a magnet surrounding a measuring space for receiving an object under test, e.g. a human body. A coil is provided for generating a high-frequency magnetic field within the measuring space. The coil is fed by a transmitter comprising a stage for adjusting the amplitude of a high-frequency current generated by the transmitter. A high-frequency magnetic field sensor is arranged at a predetermined calibration location outside the measuring space for measuring the high-frequency magnetic field strength prevailing at the predetermined calibration location. For calibrating the high-frequency magnetic field strength during a tomography measurement, the coil with the object under test inside is subjected to a test current and the resulting high-frequency magnetic field amplitude is sensed.

Abstract: An improved device for immobilizing or impounding any vehicle includes a pair of jaws that can be brought together on either side of a wheel to capture that wheel. A chock of width equal to the wheel rests against the ground and prevents movement of the captured wheel. The device is preferably made of hardened steel and is assembled in such a way as to make non-destructive disassembly impossible. The design and construction of the device make it impossible to twist or otherwise misalign the jaws or the chock of the device, except by use of extreme and excessive force.

Abstract: A method and an apparatus are disclosed serving to minimize acoustic emission of submerged submarines. Moving mechanical elements in an inner region give off vibrations onto an outer hull via a vibration transmission path. The vibrations are damped with damping means in the vibration transmission path. The damping means is configured as an evacuated intermediate space and is inserted in the vibration transmission path.

Abstract: A method and an apparatus are disclosed serving to reduce acoustic emission from submerged submarines in which vibrations from moving mechanical elements within an inner region are transmitted to an outer hull via a vibration transmission path. For decoupling the outer hull as completely as possible from the moving mechanical elements, for example periodically moving nuclear reactor control rods, the vibrations are actively damped. Means are provided for ascertaining the motion of the mechanical elements relative to the outer hull and for superimposing upon said motion of counter-motion of opposite direction.

Abstract: Methods for measuring liquid levels and leak rates in a storage tank, using an acoustic transducer and a quasi-static reference device that positions an acoustic target within a predetermined distance range below the surface of the liquid. A method for measuring the height of the surface of a liquid, i.e., liquid level.

Abstract: A luminous power supply apparatus for driving gas discharge devices and the like with relatively high frequency voltages including an output transformer having a primary winding and a secondary winding across which a device to be powered may be connected, transistorized switches connected to the primary winding for providing pulses of alternating polarity thereto when driving, a pulse width modulator for driving the switches at an RF frequency, and a controller for selecting the width of the drive pulses to control the power applied to the device to be powered. The output transformer is comprised of: a pair of U-shaped core members having their corresponding ends joined together to form a unitary core; a primary winding wound about one side of the core and overlying a first junction of the pair of core members; a secondary winding wound about an opposite side of the core and overlying a second junction of the pair of core members; and potting means having a coefficient of resistance of 3.

Abstract: A shock absorbing filler for hollow sporting equipment that will absorb vibrations generated during use of said equipment. An elongated block of thermoplastic elastomeric honeycomb, either bare, singly faced or doubly faced, is packed within the hollow handle or hollow throat of an item of sporting equipment. The honeycomb block expands within said hollow core to provide a vibration dampening interface.

Abstract: A method for providing B.sub.0 homogeneity at voxels away from the magnet isocenter for use in volume selected NMR spectroscopy wherein voxels are shimmed using only first-order X, Y and Z shims to produce three dimensional shim current maps that are utilized in setting up for in vivo spectroscopy.