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High intensity focused ultrasound (HIFU) is being increasingly used in medical therapeutics. The properties of the ultrasonic fields applied entail challenging acoustic output measurement tasks: the generation of high-pressure amplitudes sufficient for cavitation; the use of high-frequency components due to the non-linear sound propagation in water; and narrow beam widths at the focus. Conventional...
High-intensity focused ultrasound (HIFU) fields can be characterized by specific hydrophones that are able to withstand the large acoustical pressures used in medical applications. Such hydrophones may show a non-flat frequency response due to their being strengthened by protection layers against cavitation damage. Therefore, hydrophone calibration data should be used in deconvolution in order to...
A vibrometer is used for hydrophone calibration in conjunction with ultrasonic nonlinear pulse excitation. This enables the characterization of the amplitude and phase response of the hydrophone in a time-efficient way. The vibrometer uses one photodiode with a certain frequency characteristic. A simulation was carried out to calculate the influence of the photodiode frequency response on the measured...
We present NewsClu, an approach to collect, cluster, categorize and select news articles from the Internet. The framework is not limited to a certain field, resort or division of news - it is capable to work on any topic and runs on real time live data on the Internet. NewsClu keeps its user informed about that particular topic by filtering, organizing, ranking and clustering of news according to...
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