Abstract: A computer-implemented method of monitoring a quality of a welding operation. The method includes: obtaining video of the welding operation in progress; processing the video to identify regions of interest in the video, each region of interest corresponding to a portion of an image in the video; for each region of interest, determining a quality index by processing the portion of the image corresponding to the region of interest; and based on the quality indices determined for the regions of interest, generating one or more welding quality signals indicative of the quality of the welding operation.

Abstract: A micro-CHP gas boiler comprises a heat exchanger having a combustion space surrounded by a water flowpath, and a gas turbine assembly which is installed in the combustion space. The gas turbine assembly includes a generator surrounded by an annular combustion chamber and cooled by a water jacket which forms part of the flowpath, and a fuel gas compressor which is integrated into the thrust runner on the turbine rotor shaft between foil air bearings.

Abstract: A micro-CHP gas boiler comprises a heat exchanger having a combustion space surrounded by a water flowpath, and a gas turbine assembly which is installed in the combustion space. The gas turbine assembly includes a generator surrounded by an annular combustion chamber and cooled by a water jacket which forms part of the flowpath, and a fuel gas compressor which is integrated into the thrust runner on the turbine rotor shaft between foil air bearings.

Abstract: A system and method for bad frame indication of a speech frame includes estimating a signal-to-noise ratio (SNR) and checking a cyclic redundancy code (CRC) value of the speech frame. When the speech frame fails CRC error detection or the SNR is below a pre-specified value, a bad frame indication (BFI) flag is set. When the speech frame passes CRC error detection and the SNR is above the pre-specified value, a receive signal quality metric of the speech frame is checked against a high threshold and, if need be, a low threshold. The BFI flag and the receive signal quality metric for the previous speech frame is checked when the current receive signal quality metric is between the high and low thresholds. The BFI flag is set according to the value of the SNR, the CRC value, the current and previous receive signal quality metrics, and the previous BFI flag.