Abstract: A refrigerator apparatus is provided having a cabinet with a freezer compartment and a fresh food compartment. A refrigeration system is included having a first expansion valve, a first evaporator situated in the freezer compartment, a first and second compressor, a condenser, a second expansion valve, and a second evaporator situated in the fresh food compartment all connected together in that order and in series in a refrigerant flow relationship. First and second fans are provided in the freezer and fresh food compartments, respectively. A servovalve is connected between the first evaporator and the first compressor for reducing refrigerant flow through the first evaporator when activated. A first thermostatic controller situated in the freezer compartment causes operation of the compressors and fans when a selected temperature in the freezer is exceeded. A second thermostatic controller situated in the fresh food compartment causes operation of the servovalve when a predetermined value is reached.

Abstract: A molding system utilizes a cold mold with a large thermal mass and contoured thin mold inserts with a low thermal mass. A composite sheet blank of glass fibers in a thermoplastic matrix resin is placed between the inserts, heated and then transported to the cold mold. The composite sheet is pressed in the cold mold between the mold inserts to flow form and then cool the part. The mold inserts keep the surfaces of the composite sheet hot during the forming process, thereby enabling the matrix resin to flow and form smooth surfaces.

Abstract: A method of passively shimming a magnet having a central bore using ferromagnetic shims is provided. The field strength in the bore of the magnet is measured at a predetermined number of points. The field inhomogeneity is determined from the measured field strengths. The fields created by a single shim of known size when positioned, at different predetermined positions in the bore of the magnet is determined. The shim locations in the bore of the magnet and shim size are determined using a linear programming solver to minimize the field inhomogeneity and the total amount of shims used. The shim sizes are determined based on the measured field in the bore of the magnet and the field created by a single shim when positioned at a predetermined number of locations. The shim size at the appropriate locations are adjusted to the determined values and the field strength of the magnet is again measured at the predetermined points.

Abstract: A multilayer mold for use in blow molding parts within short cycle times is provided. The multilayer mold has a hard skin layer, an insulating layer and a base containing cooling means. The transient temperature increase of the skin layer of the mold as a hot parison contacts the mold is used to produce smooth surfaces on parts since the skin layer remains hot during parison inflation.

Abstract: An upper contoured die which mates with a lower contoured die is rotated relative to and against the lower die to progressively squeeze and deform a softened thermoplastic sheet. The two dies create sharp detail on both surfaces of the deformed sheet without tearing the sheet.

Abstract: A method of shimming a magnet having correction coils is provided. The field strength in the bore of the magnet is measured at a predetermined number of points. The field inhomogeneity is determined from the measured field strengths. The field created by a fixed current in each shim coil operating alone, at each of the predetermined points is determined. The shim correction coil currents are determined using a linear programming solver to minimize the field inhomogeneity and the correction coil currents. The correction coil currents are determined based on the measured field in the bore of the magnet and the field created by each of the shim coils when carrying a fixed current, with the correction coil currents each constrained to a maximum value which is adjusted for the current in the correction coils when the field strength was measured. The correction coils are adjusted to the determined values and the fields strength of the magnet is gain measured at the predetermined points.

Abstract: A process for forming a thermoplastic resin coating on glass fibers comprises heating a thermoplastic resin powder until molten and applying it to the glass fibers. The coated fibers can then be heated and drawn into a desired shape which also removes resin. Then the coated fibers are cooled to make a preform. The coated fiber preform can then be molded. Several resin layers with glass fibers of varying lengths can be deposited to make a graded preform. Apparatus for forming a thermoplastic resin on glass fibers sprays hot thermoplastic powder on the glass fibers. The coated fibers can then be heated such as by IR lamps and then drawn through a die which has a spigot to remove excess plastic. Alternately, a plurality of plastic and glass fiber layers can be deposited on a veil.

Abstract: A layer of a neat resin in powder form is deposited either on a mold surface or on a bulk thermoplastic composite fiber reinforced sheet. The resin layer is adjacent to an insulated wall of a compression mold. The bulk sheet is preheated and compression deformed with the powdered resin. The heat from the sheet flows to and melts the powder layer producing a resin rich layer. The insulated wall permits the heat of the sheet to be retained sufficiently to melt the powdered resin. In the alternative, the neat resin powder may be replaced with a preformed film of thermoplastic resin compatible with the sheet resin. A structural homogeneous integral molecular bond is formed between the neat resin layer and the sheet.

Abstract: An apparatus for installing shim guide rails in an MR magnet is provided including a plurality of beam members, one for every guide rail to be installed. A plurality of coaxial ring shaped members spaced apart from one another are joined together by the beam members. The beam members extend axially and are spaced circumferentially about the outer diameter of the ring shaped members forming a cylindrical open ended cage. Each of the beam members defines a plurality of radially extending spaced apart apertures. A plurality of ladder-like structures each of which is associated with a respective beam member is provided. Each of the ladder-like structures included two side pieces joined by a plurality of rungs extending between the side pieces. The rungs pass through the holes in the beam members with one of the side pieces situated inside the cylindrical cage and the other situated outside the cage.