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The article substantiates the use of the resistance-acoustic method in problems of non-destructive testing of mechanical stresses or defects in structures of metals and alloys in natural and technical systems. The possibilities of the use of the proposed method for the potential monitored facilities were analyzed, to which the strict requirements for operational security are imposed (bearing reinforced...
A theoretical model for one-dimensional CuO nanowire was established considering transport mechanisms induced by different defect concentration. By using a one-dimensional heat equation, the emission current was calculated by considering the temperature induced by the emission current. The maximum emission current density and maximum applied field was studied considering different electrical properties...
This paper presents the modeling of the charging time constant of supercapacitors in a mathematical formulation by the use of Matlab Simulink tools. It also intends to encourage the students in control engineering to grab the extent of the Matlab Simulink in built application since it offers a virtual laboratory works.
This paper deals with a finite-element method based design of a liquid-rheostat reduced-voltage starter for three phase squirrel-cage induction motors which typically drive irrigation pump loads.
Achieving mathematical model and simulation is essential in the design of complex installations. This allows analysis of different operating modes and behavior evaluation system. This enables notification of possible errors and their correction, avoiding additional costs involved in achieving and testing facility in real conditions. Some operating modes may be degraded modes would be very difficult...
The approach to creation of a refined math model of transient resistance electric arc that is suitable for analysis of relay protection operating and parameters monitoring in information signs multidimensional space, is outlined in the article. It describes experimental research of electric arc parameters, particularly determination of plasma conductivity for various temperatures. Obtained function...
In this paper, we develop a multiplicative model to simulate the tungsten (W) film resistivity and gate resistance for replacement metal gate (RMG) with W electrode. Our multiplicative model predicts that TiN fill offers the lower gate resistance than TiN/W fill for highly scaled gate lengths. By absorbing the results from our model into the real RMG FinFET devices, we observe that TiN fill provides...
This paper presents a simulation-based study of using graphene in polarization reconfigurable antennas for wireless communication applications in the microwave regime. Two scenarios are analysed and simulated based on the square patch antenna made of copper or a hybrid transparent film where the truncated corners are replaced by graphene extensions. The graphene extensions are activated or deactivated...
A physical electro-thermal model that describes bipolar resistance switching in Nb2O5-based memory devices is presented based on the finite element method. The switching mechanism is assumed to be controlled by the diffusion and drift of oxygen vacancies in conductive filaments (CFs). The proposed model correctly describes the microscopic morphology of the CF during the gradual reset transition, which...
Negative resistivity of Si and Si0.9Ge0.1 DDR IMPATT diode are numerically computed using double iterative method and modified Runge-Kutta method and results are compared for identical input parameters. Simulation is based on simultaneous solution of Poisson's equation, continuity equation and carrier diffusion equation in addition with the effect of mobile space charge subject to the appropriate...
In this paper, a lightning return-stroke model that considers a nonlinear resistance is used to investigate the influence of three different parameters on lightning-induced voltages on a nearby overhead line, namely channel conductivity, initial channel radius, and a constant responsible for controlling the rate of radial expansion of the channel. The obtained results suggest that the modification...
In this paper, we introduce an efficient approach to estimate the losses of carbon nanotube-based devices. The approach is based on realistic operational parameters beyond quantum limits. It calculates the electric resistance and conductance for different devices with different numbers of carbon nanotubes. The model shows good agreement with experimental data. An efficient approach to estimate the...
In this paper, a new structure for memristor with two active layers of TiO2 and its linear ions drift model has been proposed. Simulation results show significant improvement in the memristor ROFF/RON ratio as compared to single active layer HP lab (conventional) memristor. As a result, switching speed and noise margin of the proposed memristor will be far better than the conventional memristor. With...
The paper presents the mathematical modeling and simulation of communication tower grounding system during lightning strike under MATLAB/SIMLINK environment. The transmission line model is used to simulate both the tower and the grounding system. Different methods of grounding such as vertical rod, horizontal rectangular grounding and the combination of the two are studied under lightning condition...
An exploding wire model that accounts for the electric field enhanced conductivity of dense metal plasma is applied to simulate an exploding wire opening switch. In contrast to many z-pinch experiments, operated in vacuum, the experiments here discuss wires vaporized in a high pressure gas environment. In addition to this, these experiments are primarily concerned with sub-eV temperatures, with a...
Recently the interest in a possible relation between electromagnetic fields created by some electric facilities, such as high voltage lines and substations, and health has been increasing. This has motivated many organizations to propose regulations to establish exposure values under electromagnetic fields. This implies the need to evaluate or measure the value of these fields. A way to accomplish...
Accurate determination of neutral-to-earth voltages (NEV) in multi-grounded distribution circuits can be quite important, particularly in systems where loads are highly unbalanced or have considerable triplen harmonic current content. Some commercially-available and open source software are capable of representing distribution systems in adequate detail for performing NEV analysis. However, results...
One of the primary purposes of performing the steady-state analysis of a distribution feeder is to determine the voltages at every node. Because these voltages are a function of the line voltage drops it is critical that the line impedances used are as exact as possible. In 1926 John Carson developed equations that would determine the self and mutual impedances of any number of overhead or underground...
The equation for the current along the transparent metal radiator is written and solved. On the base of the equation solution the currents distribution along the radiator axis was analyzed.
The electronic band structure of cation and anion vacancies in NiO is assessed using density functional theory in conjunction with the local density approximation and employing on site Coulomb corrections within the LDA+U method. The calculated formation energies identify the stability of charged vacancy states consistent with experimental reports. We propose a microscopic model for the formation...
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