OVERVIEW The efficacy of modal analysis in detecting and localizing damage is debated based on sensitivity concerns – modal frequencies are extremely insensitive to small changes in local parameters and geometry. Convincing evidence of sensitivity issues is vast, and here we cite a single field study of a 163 ft. long, 10 ft. deep experimental test girder from an I40 bridge in Bernalilo County ...

At frequencies around ωx, the inductor can be equivalently modeled by the parallel circuit on the right where the conductance Gp relates to the resistance Rs as The relationship between the maximum oscillation frequency and the process parameter fT for two useful classes of oscillators is developed. Results show that the oscillation frequency of a class of LC-tank oscillators can be substantial...

The FFT is used widely in signal processing for efficient computation of the Fourier transform (FT) of finitelength signals over a set of uniformly-spaced frequency locations. However, in many applications, one requires nonuniform sampling in the frequency domain, i.e., a nonuniform FT . Several papers have described fast approximations for the nonuniform FT based on interpolating an oversample...

Advanced circuits based on metamorphic HEMT (MHEMT) technologies on 4” GaAs substrates for both millimeter-wave, and mixedsignal applications are presented. Extrinsic cut-off frequencies of ft = 293 GHz and fmax = 337 GHz were achieved for a 70 nm gate length metamorphic HEMT technology. The MMIC process obtains high yield on transistor and circuit level. Single-stage low-noise amplifiers demon...

The effects of postprocessing annealing on direct current, radio frequency small signal, and power performances of AlGaN/GaN high electron mobility transistors with a gate-length of 0.2 mm were investigated. The postannealing technique can improve the device performance, especially, after 10 min postannealing at 400 °C, the gate-to-drain breakdown voltage of devices exhibits remarkable improvem...

A single-finger physical model of 180 nm gatelength and 75 μm gate-width AlGaN/GaN HEMTs is described including lateral structure and vertical material parameters. The Farahmand Modified Caughey Thomas fitting function and the Monte Carlo model are used to express the 2DEG mobility in low and high field respectively. Then DC characteristics is simulated and the initial condition generated by se...

The rotatory vestibulo-ocular reflex (VOR) keeps the visual world stable during head movements by causing eye velocity that is equal in amplitude and opposite in direction to angular head velocity. We have studied the performance of the VOR in darkness for sinusoidal angular head oscillation at frequencies ranging from 0.5 to 50 Hz. At frequencies of > or = 25 Hz, the harmonic distortion of the...

Detection of visually salient image regions has been of great research interest in recent years. It is useful for a wide range of applications such as object detection, video summarization and object segmentation. In this paper, we propose a modified method based on frequency-tuned (FT) model for salient region detection that outputs full resolution saliency maps with well-defined boundaries of...

In this paper the Darlington pair and internal circuit biasing technique is used for the enhancing the slew rate as well as gain and unity gain bandwidth. The proposed CMOS Op-Amp has been verified through Cadence Analog Design Environment with spectre simulator in the standard 45nm CMOS process. In this proposed circuit the gain stage is divided in two parts, first is modified gain stage and s...

We report the regions where a signal-to-noise ratio (SNR) gain exceeding unity exists in a parallel uncoupled array of identical bistable systems, for both subthreshold and suprathreshold sinusoids buried in broadband Gaussian white input noise. Due to independent noise in each element of the parallel array, the SNR gain of the collective array response approaches its local maximum exhibiting a...