摘要:
A system and method for estimating calibration parameters and locating a Calibration Earth Station (CES) is described. The method may be performed offline. The method includes: providing L×M pilot signal measurements in a matrix R from L CESs and the M feed elements, wherein the matrix R comprises a set of channel coefficients c={c1, c2, . . . , cM}, and k={k1, k2, . . . , kL} perturbations; linking a subset of channel coefficients {c1, c2, . . . , cM} using each of the L CESs; and estimating a relative estimate of the k={k1, k2, . . . , kL} pertubations across the L CESs by using each of the L CESs as a bridging element. In the method, the bridging element provides a strong pilot signal for at least two of the L CESs. A set of criteria for determining locations of CESs have been described. A set of desirable properties for the solution set of L CESs have been disclosed. A combination of inner loop and outer loop methods for determining the final set of optimal locations have been described.
摘要:
A method for networked scheduling is disclosed. The method includes: providing a gateway; a plurality of channels assigned to a color reuse scheme including colors, wherein some of the plurality of channels assigned to one of the colors comprise a set of co-channels; associating the set of co-channels with the gateway; generating a traffic pattern for the set of co-channels for an upcoming allocation slot; determining a channel state of each co-channel in the set of co-channels per the traffic pattern; and setting a Modulation and Coding scheme (MODCOD) of each co-channel in the set of co-channels based on the respective channel state.
摘要:
A ceramic core for use in casting an article such as for example an airfoil, wherein the ceramic core has a pocket located at or near a region of the core that is otherwise associated with occurrence of a localized casting defect in the cast article. A covering is disposed on the core to cover the pocket and provide core outer surface features.
摘要:
A reinforced core for use in metal casting processes, especially directional solidification casting processes, comprises an elongated, thin-walled outer quartz or silica rich tubular member and a carbon base reinforcement disposed in and extending along a length of the tubular member. The carbon base reinforcement can comprise one or more graphite rods cemented together in end-to-end relation or a carbon fiber bundle. The carbon base reinforcement can include an outer carbide surface region by coating or surface reaction.
摘要:
A reinforced ceramic investment casting shell mold and method of making such mold. The ceramic investment casting shell mold includes alternate, repeating layers of a ceramic material and a ceramic stucco defining an overall thickness of the shell mold. A fibrous reinforcing material is disposed in the alternate, repeating layers at an intermediate thickness of the shell mold. The fibrous reinforcing material has high tensile strength at elevated temperature and a coefficient of thermal expansion that is less than the coefficient of thermal expansion of the ceramic material and the ceramic stucco. The fibrous reinforcing material is preferably woven into a twisted yarn and disposed in a generally spiral configuration.
摘要:
An approach is provided for distributing multi-media information from a satellite broadcast system. A hub receives a signal from the satellite broadcast system, wherein the signal represents video information and audio information associated with multiple broadcast channels. The hub centrally demodulates and decodes the received signal for distribution to one of a number of access point devices. According to one embodiment of the present invention, the decoded signal represents uncompressed video and audio information corresponding to one of the broadcast channels. The access point devices convert the received decoded signal for output respective displays (e.g., television sets). The hub can also be equipped with an interface to provide access to a public data network, such as the global Internet. Further, the hub can be supplied with a digital video recording capability.
摘要:
A rotor hub assembly and method for controlling movement of a rotor blade relative to a swashplate. The hub assembly having an attachment device operably associated with the rotor blade and the swashplate. The attachment device provides pivot and rotational blade movement relative to the swashplate. A dual spring-rate damper is operably associated with the attachment device. The damper switches between a first spring rate and a second spring rate during flight to control movement of the rotor blade. The method includes the process of switching the damper between the first spring rate and the second spring rate during flight.
摘要:
A single crystal nickel base superalloy consists essentially of, in weight %, about 6.4% to about 6.8% Cr, about 9.3% to about 10.0% Co, above 6.7% to about 8.5% Ta, about 5.45% to about 5.75% Al, about 6.2% to about 6.6% W, about 0.5% to about 0.7% Mo, about 0.8% to about 1.2% Ti, about 2.8% to about 3.2% Re, up to about 0.12% Hf, about 0.01% to about 0.08% by weight C, up to about 0.10% B, and balance Ni and incidental impurities. The superalloy provides improved alloy cleanliness and castability while providing improved high temperature mechanical properties such as stress rupture life.
摘要:
A document distribution system transfers a document from a source computer to a destination computer in the form of a print file. The print file defines the appearance of the document in a code suitable for telling a printer how to print the document. The source computer executes “license stamper” software for embedding an encoded license stamp into the print file before it is sent to the destination computer. Viewer software executed by the source computer receives and parses the print file to determine whether it contains the license stamp. If so, the viewer may generate a video display of the document defined by the print file or may print the document by sending the print file to a printer. However if the viewer receives a print file not containing the embedded license stamp, the viewer refrains from displaying or printing the document.
摘要:
A ceramic core for use in casting an article such as for example an airfoil, wherein the ceramic core has a pocket located at or near a region of the core that is otherwise associated with occurrence of a localized casting defect in the cast article. A covering is disposed on the core to cover the pocket and provide core outer surface features.