This paper presents an improved lumped element model for clamped, circular-shape, piezoelectric micromachined ultrasonic transducers (pMUTs). A small signal equivalent circuit is developed to include electrical, mechanical, and acoustic domains, which are analyzed separately combined with the associated couplings. For first time, a two-term mode shape approach adapted reveal intrinsic extrinsic...

Piezometric heads in the core of Sattarkhan earthfill dam in Iran have been analyzed in this paper via Artificial Neural Network (ANN). Single and integrated ANN models were trained and verified using each piezometer’s data, and also the water levels on the up and downstream of the dam. Therefore, in the single ANN modeling a single ANN was developed for each piezometer, whereas in the integrat...

With the help of an electromagnetic field simulator (i.e., HFSS), the embedding impedance of a 660-GHz waveguide SIS mixer is thoroughly investigated using a lumped-gap-source and de -embedding method. The effects of the junction’s feed-point displacement and chip thickness are examined.

This work demonstrates with numerical simulations, the feasibility of a wide frequency range and high pressure level piezoresistive microphone based on MEMS technology. An accurate lumped-element model was used to optimize the microphone dynamic response. Mechanical lumped parameters were extracted from structural finite element method (FEM) simulations, while squeeze film fluid parameters were...

This paper describes a web-based finite element program called portal of damage. The purpose of the program is the numerical simulation of reinforced concrete framed structures, typically buildings, under earthquakes or others exceptional overloads. The program has so far only one finite element based on lumped damage mechanics. This is a theory that combines fracture mechanics, damage mechanic...

AfMtmct-Kuroda’s identities, wfdch are used in anafysfs and syntheafs of dfatributed transndssion ffne cirad~ may be appfied to mixed lumped and distributed ChCUitS. It is ShOWO that circuits COOSfStiOg Of ca.vcade connections of lumped reactance and nnfform tranandssion Ifnea are equivalent to circuits consisting of a cascade connection of nomndform transmission Iiie-aj lumped reactancq and id...

This paper investigates the ability of several alternate models of Artificial Neural Network (ANN) to predict the probability of occurrence of Hypertension (HT) in a mixed patient population. To do this a two-layer feed-forward neural network with 13 inputs and 1 output was created with a single hidden layer . Different types of networks structures, such as NEWFF (feed-forward back propagation ...

The conventional integrated lens antennas (ILAs) for beam steering suffer from internal reflections that deteriorate the scanning properties. The internal reflections are known to affect side lobes, cross-polarisation level, input impedance of the feed, and mutual coupling. In this paper, ILAs are designed to exhibit very low reflection loss, i.e., to minimize the internal reflections. Wide ran...