摘要:
A plasma arc torch and method for improving the life of the consumable parts of the plasma are torch, including the electrode, the tip and the shield cap. The method includes turbulating gas as it flows over the exposed surfaces of the electrode, tip and shield cap to increase turbulence in the hydrodynamic boundary layer of the gas flow, thereby enhancing convective heat transfer. The result of enhanced cooling is improved consumable parts life. For example, to increase the turbulence of the gas flow over the outer surface of the electrode, the plasma arc torch electrode has a roughened, or textured outer surface formed with dimples, axially extending grooves or spiraling grooves formed in the outer surface of the electrode. The inner and outer surfaces of the tip and the inner surface of the shield cap are similarly textured.
摘要:
A device and method are provided for forming a beam of a transmit antenna array in the direction of a positioning receiver. Since the beam of the transmit antenna array is formed remotely by the positioning receiver, the received gain of the incoming positioning signal is maximized while signals from other directions are attenuated, thereby mitigating any unwanted effects of multipath. Depending on the number of elements in the transmit antenna array and their physical distribution, the width of the beam can be made finer such that the positioning receiver only requires a simple omni-directional antenna to achieve an accurate positioning solution.
摘要:
A method and apparatus is disclosed for improving network performance in a communication system. A system that incorporates teachings of the present disclosure may include, for example, a server having a controller to group a plurality of wireless base terminals (WBTs) into first and second groups that share at least one common WBT and select a resultant communication path for the at least one common WBT to a mobile telephone switching office based on differential delays associated with alternative communication paths for combinations of WBTs in at least one of the first and second groups. Additional embodiments are disclosed.
摘要:
Generating frequency coherence between a received reference positioning signal carrier component transmitted by at least one reference transmitter and a unique positioning signal carrier component generated by a positioning-unit device. The positioning-unit device receives a reference positioning signal and measures a frequency offset of the reference positioning signal carrier component relative to a common oscillator. Once a frequency offset is measured, the positioning-unit device adjusts a frequency steerable clock by an amount derived from the measured frequency offset. The positioning-unit device then generates a unique positioning signal carrier component at an aligned carrier frequency with the reference positioning signal carrier component. Furthermore, the positioning-unit device continuously adjusts the unique positioning signal carrier component by applying the measured frequency offset to the frequency steerable clock, which is reference to the common oscillator. Subsequently, the frequency of the adjusted unique positioning signal carrier component is aligned with the frequency of said reference positioning signal carrier component.
摘要:
A system and method for providing assistance to a position receiver in a location network consisting of a Global Navigation Satellite System (GNSS) and a synchronized network of positioning-unit devices is disclosed. A positioning-unit device observes the time and frequency of received Global Navigation Satellite System (GNSS) signals relative to the synchronized network of positioning-unit devices. These time and frequency observations are modulated, as assistance data, onto the positioning signals that are broadcast by the positioning-unit devices. A position receiver demodulates the assistance data and analyzes the positioning signals. The position receiver then searches for Global Navigation Satellite System (GNSS) signals in a range responsive to the assistance data and the analysis of the received positioning signals.
摘要:
A method of routing video data includes receiving data from a Video on Demand (VoD) content source at a network management system, the data indicating a first set-top box device requesting VoD content. The method also includes identifying an end node group associated with the first set-top box device. The end node group includes a plurality of set-top box devices that share a resource at the VoD content source. Further, the method includes selecting a network path between the VoD content source and the first set-top box device from a set of prospective network paths associated with the first set-top box device. The set of prospective network paths associated with the first set-top box device and network path sets associated with other set-top box devices of the end node group simultaneously satisfy a plurality of constraints related to network path delay and jitter.
摘要:
A method and apparatus is disclosed for method and apparatus for maintaining network performance in a communication system. A system that incorporates teachings of the present disclosure may include, for example, a network management system (NMS) that manages operations of a communication system including a mobile telephone switching office (MTSO) coupled to a plurality of wireless base terminals (WBTs) by way of a corresponding plurality of network elements, having a network configuration element that identifies for each of the plurality of WBTs a plurality of resultant communication paths to the MTSO according to a plurality of differential delays calculated from alternative communication paths connecting combinations of the WBTs to the MTSO for each of a plurality of change scenarios affecting the plurality of network elements. Additional embodiments are disclosed.
摘要:
In one embodiment of the invention, photo-chromic and phosphorescent toys are disclosed. A photo-chromic and phosphorescent toy includes both photo-chromic and phosphorescent materials applied to the toy such as through an ink, paint, plastic, or dye. The photo-chromic and phosphorescent materials may be supplied within a material of the toy or applied-to a surface of the toy at the factory. The photo-chromic and phosphorescent materials may be activated in various ways with various light activating devices that can generate an activating light with appropriate wavelengths.
摘要:
A method is provided for electrochemically depositing a polysaccharide mass having a selected physical state. According to an embodiment, an electrically conductive support of a substrate is contacted with an aqueous solution including a selectively insolubilizable polysaccharide, and the selectively insolubilizable polysaccharide is electrochemically deposited on the electrically conductive support while controlling deposition conditions to form the polysaccharide mass having the selected physical state, such as that of a hydrogel. Deposition may be performed in a spatially and/or temporally controlled manner.
摘要:
The present invention discloses a positioning system and method for enabling a roving position receiver to determinist own position. The positioning system comprises a specialized transceiver (hereinafter termed a positioning-unit device) that receives one or more reference positioning signals from other positioning-unit devices and/or other qualified reference positioning signal sources. Each of the received reference positioning signals preferably has a carrier component, a pseudo-random code component, and a data component. The Positioning-Unit Device generates, in response to the received reference positioning signals and their known locations, a unique positioning signal. The unique positioning signal has a carrier component chronologically synchronized to one or more of the carrier components of the received reference positioning signals, a pseudo-random code component chronologically synchronized to one or more of the pseudo-random code components of the received reference positioning signals, and a data component chronologically synchronized to one or more of the data components of the received reference positioning signals. Once a Positioning-Unit Device is chronologically synchronized to a reference transmitter, other Positioning-Unit Devices entering the network can use its transmitted unique positioning signal as a reference positioning signal. The geographical distribution of these chronologically synchronized Positioning-Unit Devices creates a time-coherent network of positioning signals that propagate a reference timebase over a substantial geographical area. The positioning system also includes a roving position receiver. The roving position receiver can generate code-based single point position determinations by making range measurements for each of the received chronologically synchronized pseudorandom code and data components, and can generate carrier-based single point position determinations by making range measurements for each of the received chronologically synchronized carrier components. The roving position receiver can autonomously calculate both code and carrier-based single point position solutions and subsequently calculate its own position without the requirement for differential correction or absolute time accuracy within the network.