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  • New Large Signal Model of AlGaAs P-HEMT and GaAs MESFET Under Optical Illumination

    As an extension of previous works in the optical-microwave interaction field, this paper shows the results of the research on large signal dynamic behaviour (Pulsed I/V curves) of AlGaAs P-HEMT (pseudomorphic high electron mobility transistor) devices, in the overall I/V plane, when the incident optical input power is changed. A complete bias and optical power dependence of the large signal model for a P-HEMT, is determined from experimental scattering parameters, DC and pulsed measurements. ...

    Ultra broadband low power MMIC amplifier

    A low power two-stage InP HEMT MMIC amplifier has been developed. The amplifier utilizes 0.12 µm T-gate InP HEMTs with 225 µm gate periphery. This compact microstrip MMIC is only 1.5 mm 2 in size. It exhibits gain of 12.51 dB at 15 mW of dissipated power over an operating range from 1 to 50 GHz. The gain bandwidth/dissipation figure of merit is 40 dB GHz/mW. The average noise figure is 3 to 3.8 dB over the Ka band.

    Discriminating mass from normal breast tissue: a novel ranklet image representation for ROI encoding

    A support vector machine (SVM) classifier is used to determine whether regions of interest (ROIs) found on breast radiographic images contain mass or normal tissue. Before being presented to SVM, ROIs are encoded by means of a specific image representation. The coefficients resulting from the encoding are then used as classification features. Pixel and wavelet image representations have already been discussed in one of our previous works. A novel orientation–selective, non–p...

    Silent Singers. The Legacy of Opera and Female Stars in Early Italian Cinema

    Although opera has undoubtedly been an important point of reference for the silent film industry, it didn’t left a conspicuous amount of traces that could allow us today to carry out wide- ranging research. This paper aims to fill this gap trying to reconstruct the relationship between opera and the silent cinema in a particular country, such as Italy, where the culture of melodrama in the early twentieth century was not only widespread among the cultural élite but also familiar to a large se...

    Extremely high gate turn-on voltage of GaAs double camel-like gate field-effect transistor

    Extremely high potential barrier height and gate turn-on voltage of a novel GaAs field-effect transistor with n+/p+/n+/p+/n double camel-like gate structure are demonstrated. The maximum electric field and potential barrier height of the double camel-like gate are substantially enhanced by the addition of another n+/p+layers in gate region, as compared with the conventional n+/p+/n single camel-like gate. For a 1 x 100 m2 device, a potential barrier height up to 2.741 V is obtained. Experimen...
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