Abstract:
High efficiency drive circuitry for a group of parallel-connected light emitting devices, in which each device is driven in series by a respective source of bias current. The maximum voltage drop among the group of biased light emitting devices is determined and in response, a control voltage to drive all the light emitting device at the lowest effective voltage for the LED group is produced.
Abstract:
Turbochargers comprise a compressor housing having an air inlet passage for receiving inlet airflow, an air outlet passage for passing pressurized air to an engine combustion system, and a compressor impeller rotatably disposed within the housing for receiving air from the air inlet passage, pressurizing the inlet air, and passing the pressurized air to the air outlet passage. An air flow conditioner is placed into air flow communication with the compressor housing air inlet passage, and can be disposed within an air inlet section of the compressor itself, or can be placed within a vehicle air ducting positioned upstream from the turbocharger. The air flow conditioner comprises a body that is specially designed having a plurality of air passages disposed therethrough to cause a desired flow conditioning effect on air passing through it and to the compressor to offset the onset of compressor surge during engine operation, thereby shifting the compressor operating efficiency curve to the left to broaden the operating efficiency window for the turbocharger compressor.
Abstract:
A unified web-based voice messaging system provides voice application control between a web browser and an application server via an hypertext transport protocol (HTTP) connection on an Internet Protocol (IP) network. The application server executes the voice-enabled web application by runtime execution of a first set of extensible markup language (XML) documents that define the voice-enabled web application to be executed. In addition, control data for the voice-enabled web application, and log files that record events that occur during execution of the voice-enabled web application, are generated and processed using an XML tag format. A second set of XML documents specify application parameters and control information to be used by the application runtime environment for execution of the first set of XML documents. The second set of XML documents enables the application server to maintain a generic application runtime environment, enabling applications to share common control information and provide personalized services for subscribers based on respective user specific control attributes. The generation of log files using an XML tag format enables the log files to use a standardized XML structure that includes log element type, log element attribute, and log element data information. Hence, logs may be written for individual user sessions and overall application information, where the XML log tags may be of sufficient descriptive nature as to be understood using any XML viewer or analyzed by custom log parser configured for locating prescribed XML tags related to a corresponding operation, for example billing, trace routing, etc.
Abstract:
Receive circuits and associated methods are provided for ultrasound imaging. Both subarray mixing and time division multiplexing are provided with a same circuit. Components of the receive circuit respond to either phasing or time slot information to implement subarray mixing or time division multiplexing. A network of switches allows combination of signals from different elements to form different sub-apertures. A controller minimizes power consumption while outputting the desired phase or time division multiplexed information by gating a clock to various registers. Each of the registers corresponds to different groups of transducer elements. For loading new phasing information, the clock is turned on to the desired register. Duration operation of the receive circuit, the clock is gated off. The register outputs the previously loaded values in a static state without clocking. Preamplification for either of time division or subarray mixed signals is provided using a variable gain amplifier with a common mode feedback. The common mode feedback provides for a constant operating point despite changes in the desired amount of gain.
Abstract:
A method of making shape-adaptable and spectral-selective distributed optical radiation sources, in the wavelength range between UV and mid-infrared, for therapeutic treatment using passive host medium containing nanocrystals is disclosed. The spectral output of the distributed optical radiation source is controlled by the nanocrystal size distribution that determines the spectral output of fluorescence radiation originating from these nanocrystals from within the said host medium, which contains the said nanocrystals, under excitation by an external source. The size of nanocrystals, or the size distribution of nanocrystals, incorporated in the host medium is selected based on the radiation spectral output required for therapeutic requirements. The passive host medium, incorporating the said nanocrystals, is made of adaptable, geometrically configurable, material that conforms to any desired shape.
Abstract:
A method is described for removing and replacing an antisoiling coating on an article that includes an optical substrate, an antireflective coating, and a previously applied, silicon containing, antisoiling coating. The article is treated in a plasma to remove the previously applied antisoiling coating. A new antisoiling coating is applied that includes a fluorinated siloxane.
Abstract:
A protection circuit for an excitation current source protects against excessive compliance voltage by using a cascode transistor between the current source and an output terminal, and a transistor coupled to the output terminal and to the control lead of the cascode transistor to cause the cascode transistor to turn off if the voltage exceeds a threshold level.