摘要:
A compressor bleed air valve in an auxiliary power unit (“APU”) modulates bleed air flow both for accessory pneumatic systems powered by the bleed air and for reducing or removing surge in the compressor.
摘要:
A power monitoring and correction to a desired power level of a laser or group of lasers utilizes two photodetectors which are employed to accurately determine the amount of output power from the front end or “customer” end of a laser or a plurality of such lasers. During power detection, which may be accomplished intermittently or continuously, the laser is modulated with a tone of low frequency modulation. One photodetector at the rear of the laser is employed to detect the DC value of the frequency tone, i.e., a value or number representative of the AC peak-to-peak swing, amplitude or modulation depth of the tone. Also, the rear photodetector may be employed to determine the optical modulation index (OMI). In either case, these values may be employed in a closed loop feedback system to adjust or otherwise calibrate the value of the low tone frequency relative to the total desired bias current applied to the laser. A front photodetector is employed to receive a portion of the total output of the laser, or of each laser, and the average output power of the laser, or of each laser, is determined from already knowing the optical modulation index (OMI) via the rear photodetector. Thus, by measuring and/or calibrating the laser OMI with the use of a rear photodetector, the average output power from the front end output can be unambiguously determined from detection of the AC peak-to-peak swing or amplitude of the low frequency tone received via the front photodetector.
摘要:
Systems and methods of centralized product production, comprising a job initiation component that receives a job request from a user; a resource management component that delegates tasks to one or more modules to produce a product to meet the job request. The modules can comprise an automated computing system or a practice group, and can report back to the resource management component. An assembly component can receive information, documents, and objects from the resource management component and assemble the items to form a product. An interface component allows a user to view progress of the product, and to receive status updates.
摘要:
An optical device includes a substrate formed of an electrooptic material, a waveguide formed in the substrate, an electrically conductive film formed over at least a portion of the waveguide and a source of DC voltage electrically connected to the film for thermally inducing a change in the optical refractive index of the substrate of the optical device.
摘要:
An apparatus for monitoring whether a cable is coupled to a port of a computer network. A free-running oscillator is initially set to a base frequency when a cable is not coupled to the port. If a cable is subsequently coupled to that port, the inherent capacitance of that cable loads one of the nodes associated with the oscillator. The result of this capacitance is that the oscillator is now running at a lower frequency. A frequency counter and threshold comparator are used to detect whether the oscillator frequency has fallen below a pre-determined frequency threshold. If the oscillator frequency has not fallen below this threshold, the port is not included in the network path. However, if the oscillator frequency has fallen below the threshold, this indicates that a cable has been coupled to the port. Consequently, the trunk port is inserted into the computer network's path.
摘要:
A hot gas generator includes a dual fuel injector (42) having spaced fuel discharge nozzles (48, 60) on the longitudinal axis (28) of a vessel (18) having a narrow inlet (22), an opposite narrow outlet (14) and an intermediate, enlarged chamber (24) which serves as a combustion chamber. The nozzle (60) injects a spray cone (64) of fuel in a cone angle that is sufficiently wide that a large angle exists between the fuel spray and the path (54) of high velocity combustion gases moving toward the outlet (14) to achieve excellent vaporization of fuel at fuel rich conditions without causing carbon buildup and/or the generation of black smoke in the exhaust.
摘要:
A gas fired hot water heater includes a housing enclosing an internal chamber divided by a vertical partition into two compartments, the partition having a top edge spaced below the top of the chamber. One of the compartments has a gas burner in the lower portion with an adjacent combustion air intake vent. A first heat exchanger is located in the same compartment above the gas burner but below the top edge of the partition, and a second heat exchanger is located in the other compartment at substantially the same horizontal level as the first. The two heat exchangers are connected in series. Condensate collection means is provided in the other compartment below the second heat exchanger to collect condensate forming on the second heat exchanger and to duct the condensate out of the housing. A flue pipe ducts flue gases from the housing, and a blower is provided to blow the flue gases through the flue pipe. In a particular development, a bimetallic, helically twisted baffle is provided within the straight portions of the central heat exchanger tube, so that temperature swings will cause the bimetallic baffle to expand and contract, thus automatically scouring the internal surface of the tubes, and reducing deposits.
摘要:
There is provided a natural gas charging system for a vehicle which has an internal combustion engine adapted to run on gasoline or on natural gas, as well as a gasoline tank adapted to feed gasoline through a carburetor to the engine. The gas charging system includes storage means such as tanks which are adapted to store natural gas under a given storage pressure, and delivery means through which natural gas can be delivered from the storage means through an air-mixing means to the carburetor of the vehicle. A compressor is adapted to receive low-pressure natural gas and to compress it up to the storage pressure, and the engine is made to drive the compressor through drive means. Conduit means are provided from the output of the compressor to the storage means.
摘要:
In the manufacture of a glass fiber reinforced plastic part a chopped glass fiber reinforced, thermosetting resin is placed in a mold cavity. A continuous filament glass fiber cylinder impregnated with the same resin used in the above formulation without chopped glass fiber is placed in the stud support areas of the mold. The mold is then closed and the resin subjected to heat and pressure to cause it to completely fill the mold cavity and cure. The cured part has continuous filament glass fiber reinforcements in the stud support areas.
摘要:
A transmissive active channel element is provided in each signal channel of a monolithic multi-channel TxPIC where each channel also includes a modulated source. The active channel element functions both as a power control element for both monitoring and regulating the output channel signal level of each signal channel and as a modulator for channel wavelength tagging or labeling to provide for wavelength locking the modulated sources. The power regulating function is also employed to control the channel signal power outputs of each channel to be uniform across the channel signal array. All of these functions are carried out by a feedback loop utilizing digital signal processing.