Abstract: One aspect of the present invention is a system of fabricating a barrier wall between the testing and tester volumes of an environmental test chamber. This aspect may use a plurality of pallets adapted to receive a device under test and a testing apparatus, a framework adapted to receive a plurality of pallets, and a plurality of insulation bricks associated with the plurality of pallets. The insulation bricks may be adapted such that they can cooperate to form an insulating barrier between the device under test and the testing apparatus.

Abstract: One aspect of the present invention is a system of fabricating a barrier wall between the testing and tester volumes of an environmental test chamber. This aspect may use a plurality of pallets adapted to receive a device under test and a testing apparatus, a framework adapted to receive a plurality of pallets, and a plurality of insulation bricks associated with the plurality of pallets. The insulation bricks may be adapted such that they can cooperate to form an insulating barrier between the device under test and the testing apparatus.

Abstract: One aspect of the present invention is a system of fabricating a barrier wall between the testing and tester volumes of an environmental test chamber. This aspect may use a plurality of pallets adapted to receive a device under test and a testing apparatus, a framework adapted to receive a plurality of pallets, and a plurality of insulation bricks associated with the plurality of pallets. The insulation bricks may be adapted such that they can cooperate to form an insulating barrier between the device under test and the testing apparatus.

Abstract: One aspect of the present invention is a system of fabricating a barrier wall between the testing and tester volumes of an environmental test chamber. This aspect may use a plurality of pallets adapted to receive a device under test and a testing apparatus, a framework adapted to receive a plurality of pallets, and a plurality of insulation bricks associated with the plurality of pallets. The insulation bricks may be adapted such that they can cooperate to form an insulating barrier between the device under test and the testing apparatus.

Abstract: The present invention provides a cost-effective method and apparatus for controlling engine speed. One embodiment generally comprises a controller and a linear actuator. The controller generates a plurality of voltage pulses having a duration and frequency related to a difference between a desired engine speed and an actual engine speed. The linear actuator converts the plurality of voltage pulses into a throttle position.

Abstract: A combustion chamber assembly (22) comprises a primary, a secondary and a tertiary fuel and air mixing ducts (54,78,98) to supply fuel and air to primary, secondary and tertiary combustion zones (40,42,44). Each of the primary, secondary and tertiary fuel and air mixing ducts (54,78,98) comprises a pair of axial flow swirlers (56,60,80,84,102,104) arranged coaxially to swirl the air in opposite directions and fuel injectors (62, 86,106) to supply fuel coaxially of the respective axial flow swirlers (56,60,80,84,102, 104). Valves (66,90) are provided to control the supply of air to the primary and the secondary fuel and air mixing ducts (54,78) respectively. A duct (122,116) is arranged to supply cooling air and dilution air to the combustion chamber (22). The amount of air supplied to the primary, secondary and tertiary fuel and air mixing ducts (54,78,98) and the duct (122,116) is measured.

Abstract: A gas turbine engine comprises a centrifugal compressor (4), an air diffuser (8), a heat exchanger (10), combustion apparatus (12), and first and second turbines (14,18). The combustion chamber assembly (22) comprises a primary, a secondary and a tertiary fuel and air mixing ducts (54,78,98). The compressor (4), diffuser (8), primary and secondary fuel and air mixing ducts (54,78) and turbines (14,18) all comprise means (6,8,16,20) for varying the mass flow area at their inlets such that in operation the amount of air mass through each component may be independently variable. Under part power conditions the mass flow is reduced and under full power conditions the mass flow is increased thereby maintaining a substantially constant gas cycle throughout the engine.

Abstract: One aspect of the present invention is a system of fabricating a barrier wall between the testing and tester volumes of an environmental test chamber. This aspect may use a plurality of pallets adapted to receive a device under test and a testing apparatus, a framework adapted to receive a plurality of pallets, and a plurality of insulation bricks associated with the plurality of pallets. The insulation bricks may be adapted such that they can cooperate to form an insulating barrier between the device under test and the testing apparatus.

Abstract: An interconnected book-package system permitting the circuit boards within book packages to communicate exclusively of the backplane (e.g., 300). This permits a circuit board that would otherwise have to be constructed from a larger than standard size circuit board and housed within a larger than standard size book package to be formed out of two standard size or smaller circuit boards housed within standard size book package assemblies. This is especially useful to customers seeking upgrade flexibility. The book packages of the interconnected system are connected mechanically and electrically exclusively of the backplane by a connection assembly (e.g., 502, 414, 504, 416) that makes it possible to blindly plug the book packages together. Multi-book latch assemblies include a clip (e.g., 702 and/or 704) used to interconnect the latches on a pair of book packages so that the connected books can be plugged into the backplane as a unit.

Abstract: An electronics package for protective enclosure and connection of the circuit to a system backplane having electromagnetic shielding and enhanced packaging density is provided. The electronics package comprises an enclosure having a first cover and a second cover. Each cover of the enclosure is formed from a multilayer circuit board having an insulating support layer of a selected thickness and of a sufficient rigidity to serve as a protective covering for the electronics package, and a shielding layer formed by a conductive plane of a thickness less than the selected thickness of the insulating support layer. At least one cover of the enclosure is a multilayer circuit board having an electronic circuit formed thereon. The electronics package further comprises a circuit card positioned within the housing and having a connector positioned on the back for mating and connection with the system backplane.

Abstract: A poster display apparatus winds a film carrying the posters between spools. The surface speeds of rotation of the spools are equalized by a rising and falling weight carried by a cord interconnecting pulleys carried by the spool axles.

Abstract: A universal disk drive system (30) incorporates multiple read/write heads (204) supported on a rotatable carousel assembly (180) for selective positioning and alignment relative to a flexible magnetic disk on a drive spindle (120). A disk is received and fed along an input path to the drive spindle (120) by feed rollers (36,38) driven in unison. A clamp cone assembly (90) is mounted for movement relative to the drive spindle (120) for clamping either one of two predetermined sizes of disks against the drive spindle with coaxial inner and outer clamp cones (102, 104). The carousel assembly (180) includes a spider (186) supported for rotation about an angled spindle support (158). A read/write head (204) is supported on each angled arm of the spider (186) for precise radial and pivotal alignment relative to the disk by means of a slidable carriage (220) and azimuth adjustment module (246). Rotation of the carousel assembly (180) is controlled by an index and locking assembly (320).

Abstract: Sorter slide apparatus for disk jacket combinations that include a slide extended into a bin of a sorter for receiving such combinations as they are discharged into a bin and conveying them to a removable box of a magazine. The disk combinations in being moved to be discharged into a bin have their open rear flaps in advance of the remainder of the jacket, and when discharged fall onto the upper part of the slide to slide downwardly and transversely while the upper slide portion supports them to be inclined downwardly both in longitudinal and transverse directions. The transverse intermediate portion of the slide has edges to cause the combinations to swingingly rotate through an angle of about 90.degree. whereby the opened flap faces toward the bin.