Abstract:
An apparatus for presenting a flexible article, longer than it is wider, in a predetermined orientation which has an orientation for tumbling the article generally about one direction while retaining the article so that it can rotate about another direction while it is being tumbled. The retention mechanism on the apparatus includes a retention face and is moveable between a first position in which the retention face is disposed to receive the article generally downwardly from the orientation head while it is being tumbled thereby, and a second position displaced from the first. Additionally, when the article is received on the retention face, it can be detected if it is correctly orientated on the retention face. In response to this detection, the retention mechanism moves to the second position and the article is received in a predetermined orientation from the retention face at the second position of the retention mechanism.
Abstract:
A method of and apparatus for scale factor compensation for piezo-electric rate sensors maintains the magnitude of vibration at a primary pick-off point substantially constant to enable one of the variables of a vibrating structure--the piezo-electric charge coefficient .beta. to be determined, and thereby enables variation of the scale factor of the sensor from a calibrated value to be determined. This enables correction of the sensor output by a computational scale factor control unit to ensure that the output therefrom allows for a more accurate sensor. Thus, sensors are provided for applications requiring a higher degree of accuracy than they were previously able to provide for.
Abstract:
In an optical supply arrangement, a laser source (10) provides transmitted laser light down an optical supply line (12, 14). A first coupler (16), remote from the laser source (10) along the optical supply line (14), taps off a small proportion of the transmitted laser light to be returned along the optical supply line (14) to a photo detector (26) driving a monitor (28) and a controller (30). If the monitor (28) detects that the photo detector (26) is experiencing a loss of return laser light, possibly due to a break in the optical supply line (14), the monitor (28) causes the controller (30) to extinguish the laser source (10) in less time than escaping laser light can cause damage to property, person or eyesight. A first embodiment has the transmitted light on a transmission fiber optic (12) and the return laser light on a separate return fiber optic (24). A second embodiment has the return laser light being sent back down the transmission fiber optic (12). A reflective key (42, 22), monochromatic to the wavelength of the laser source, is selectably removable to disable the laser source (10) for maintenance or conditional access. The monitor (28) can operate on absolute levels, averages or rates of change to establish if a loss of transmission has occurred.
Abstract:
A vibrating cylindrical rate sensor (10) is mechanically balanced and mode aligned with respect to the vibrating portion of the sensor (10) by removing material from a vibrating portion of the vibrating cylinder (34) after the drive and pick-off transducers (30, 32, 30a, 18, 20) are fixed to the vibrating portion of the vibrating cylinder (34) of the cylindrical rate sensor (10).
Abstract:
A system for use in a well includes an optical cable for positioning in the well. An optical sensor is optically coupled to the optical cable, where the optical sensor has a capillary tube and an optical fiber in the capillary tube. The capillary tube also includes a first sealed region containing a metallic material that is in liquid form at a downhole temperature in the well. A joint mechanism may attach the optical sensor to the optical cable.
Abstract:
An oral hygiene device having an ultrasound transducer 22 and an acoustic waveguide 24 facilitating the transmission of ultrasonic acoustic energy to fluids in the oral cavity is disclosed. Preferred ultrasound operating parameters for operation in aqueous environments and in dental slurries are disclosed. Devices may incorporate a drive motor 16 for oscillating a device head 23, acoustic waveguide 24 and one or more bristle tuft(s) 26 at sonic frequencies, and preferred sonic operating parameters are also provided. Multi-element piezoelectric transducer assemblies 30, 40, and various control and communications features are disclosed. Oral hygiene devices disclosed herein achieve improved plaque and stain removal from the teeth as well as interproximal and subgingival regions, while enhancing the user experience, massaging the gums, stimulating dental tissue, and disrupting biofilm.
Abstract:
A mechanism for minimizing effective memory latency without unnecessary cost through fine-grained software-directed data prefetching using integrated high-level and low-level code analysis and optimizations is provided. The mechanism identifies and classifies streams, identifies data that is most likely to incur a cache miss, exploits effective hardware prefetching to determine the proper number of streams to be prefetched, exploits effective data prefetching on different types of streams in order to eliminate redundant prefetching and avoid cache pollution, and uses high-level transformations with integrated lower level cost analysis in the instruction scheduler to schedule prefetch instructions effectively.
Abstract:
An apparatus for sensing data from a remote optical sensor 16 has its frequency stabilised by balancing the outputs of narrow band filter 28 30, spaced about a desired frequency 36 positioned at about the 3db down points 40 of a broad band light source 10 using voltage control, current control or temperature control to vary the frequency of the wide band light source 10. Difference between the outputs through the two narrow band filters 28 30 can be used to drive an amplifier 48 to correct the frequency of the broad band light source. The outputs through the two narrow band filters 28 30 can be converted 52 to binary numbers and fed to a microprocessor 56 which is used, via analog conversion 60, to drive the amplifier 48. The broad band light source 10 can be pulse modulated 68 to provide temporally separate light pulses 92 94 through each of the narrow band filters 28 30, measured at separate times. The corrective output to the amplifier 48 can be governed by a ratio between the outputs through the narrow band filters 28 30 rather than by a difference there between.
Abstract:
An improved scheduling technique for software pipelining is disclosed which is designed to find schedules requiring fewer processor clock cycles and reduce register pressure hot spots when scheduling multiple groups of instructions (e.g. as represented by multiple sub-graphs of a DDG) which are independent, and substantially identical. The improvement in instruction scheduling and reduction of hot spots is achieved by evenly distributing such groups of instructions around the schedule for a given loop.
Abstract:
A vibrating cylindrical rate sensor (10) is mechanically balanced and mode aligned with respect to the vibrating portion of the sensor (10) by removing material from a vibrating portion of the vibrating cylinder (34) after the drive and pick-off transducers (30, 32, 30a, 18, 20) are fixed to the vibrating portion of the vibrating cylinder (34) of the cylindrical rate sensor (10).