Abstract In this paper, we use Silvaco-ATLAS two-dimensional numerical simulation to calculate the performance of two different circular-gate AlGaN/GaN HEMT device models. The influence special structure on DC characteristics is studied and compared with that conventional devices. Compared conventional, threshold voltage drain-center source-center devices increased from 1.1 V 1.5 V, while transconductance improved 245 mS/mm 328 285 respectively. on-state devices, maximum saturation output...

Abstract In this paper, we use Silvaco-ATLAS two-dimensional numerical simulation to calculate the performance of two different circular-gate AlGaN/GaN HEMT device models. The influence special structure on DC characteristics is studied and compared with that conventional devices. Compared conventional, threshold voltage drain-center source-center devices increased from 1.1 V 1.5 V, while transconductance improved 245 mS/mm 328 285 respectively. on-state devices, maximum saturation output...

The dynamics of the generation various spike trains in neural pacemakers is fundamental importance to understanding coding. Recent studies have demonstrated, theoretically and experimentally, that produce chaotic oscillations. Deeper analyses several neuronal models revealed many nonlinear phenomena including period-adding bifurcations whose existence has not been experimentally confirmed. In this letter, we reported bifurcation with chaos was observed interspike interval (ISI) series...

An efficient analytical model based on electromagnetic (EM) topology has been developed for predicting the EM field coupling with a lossless penetrated transmission line (TL) of which termination loads are located in two enclosures, respectively, excited by an internal vertical monopole and external plane wave oblique incidence. Firstly, electric fields generated calculated Bethe's aperture theory scalar function method. Then, network interaction is established according to analysis...

An efficient analytical model based on electromagnetic topology (EMT) has been developed for predicting the (EM) field coupling to a rectangular enclosure with an electrically large aperture via penetrated transmission line (TL), excited by external plane wave of oblique incidence. First, electric in is calculated modified Bethe’s small holes theory and mirror procedure. Then, networks EM interaction are constructed analyzing paths mechanism, current induced at termination loads TL obtained...

An efficient field‐to‐line coupling model in the time domain is developed combining second‐order decoupled multiconductor transmission lines (MTLs) equations and finite‐element time‐domain (FETD) method for evaluating electromagnetic (EM) transient response of MTLs over a lossy ground excited by high‐altitude EM pulse (HEMP). First, incident HEMP electric fields on are calculated as equivalent distributed sources introduced into equations. Then, discrete FETD against HEMP, which effect...

An efficient analytical model has been developed for predicting the electromagnetic (EM) field coupling to a lossless transmission line (TL) penetrating through cascaded multiple rectangular enclosure with hybrid apertures (apertures and without conductive sheets coexist) excited by an external plane wave of oblique incidence. First, The EM in covered is derived using dyadic Green’s function transfer impedance sheet. Then, based on Bethe’s small holes theory mirror procedure. Finally,...

An efficient analytical method has been proposed for predicting the shielding effectiveness (SE) and resonances of a metallic enclosure with multiple apertures against an external incident plane wave. First, electromagnetic (EM) field distribution within through is represented by equivalent electric magnetic dipole moments based on Bethe’s theory small aperture coupling. Then, EM fields in can be obtained using scalar wave functions, where unknown coefficients functions are related to...

An efficient analytical method based on the Baum–Liu–Tesche (BLT) equation has been developed for predicting shielding effectiveness (SE) of an apertured enclosure excited by external plane wave. First, equivalent circuit and signal flow graph are constructed, which helps understand energy transmission enclosure. Then, SE is obtained using generalised BLT equation, proposed employed to analyse effect various parameters SE. Finally, extended handle with aperture array, apertures at opposing...

In this paper, an improved analytical model is presented to predict the shielding effectiveness (SE) and resonances of apertured enclosure composed material finite conductivity. model, modified parameters rectangular waveguide are introduced deal with lossy apertures, which can consider effects wall loss on SE. Firstly, according circuit theory electromagnetic topology (EMT) theory, modeled as signal flow graph, respectively. Then, electric field components at monitor point be obtained;...

Substation inspection is one of the most important works keeping safe and stable operation substation in power systems. The study based on latest wearable large data services technology, adopting human judgment analysis capabilities as center new intelligent technology. It actually has many innovations though integrated research application virtualization, big data, smart devices other technologies. For example, taking advantage Google glasses to develop visualization professional...

An analytical model for double-layer shielding metallic enclosure with inner strip-shaped plates is proposed analyzing the effectiveness of complex enclosures containing multiple spatial structures, based on actual situation that circuit systems in each region are inevitably interfered by electromagnetic penetration those adjacent regions through slots, cables, and other transmission channels. The near-field interference external layer represented equivalent electric dipoles, internal it...

To analyze electromagnetic (EM) transient responses of a buried cable, an accurate and reliable time-domain method is proposed in this paper. The approach based on the transmission line (TL) second-order telegrapher’s current equation, expressions ground impedance admittance at higher frequencies are used to obtain discrete finite-element (FETD) equations for cable. Finally, termination loads cable obtained global FETD which assembled using all intervals. accuracy effectiveness demonstrated...

An improved model based on the electromagnetic topology (EMT) theory and Baum-Liu-Tesche (BLT) equation is presented to evaluate shielding performance of an apertured enclosure. First, total aperture impedance arbitrarily positioned apertures can be easily obtained through coupling factor. Then, expression electric field components at any monitor point inside enclosure derived according relation between voltage response distribution, hence, effectiveness (SE) resonances analyzed...

Substation inspection is not only one of the most important means ensuring safe and stable operation equipment, but also a significant way timely detecting dominant recessive defect preventing accidents. This paper presents virtual video real-time data demonstration used for smart substation based on latest wearable services technology (such as Google glass). Glass hands-free uses augmented reality voice activation to project useful into our field vision. A key use-case google glass could be...

Safe and reliable operation of the power grid equipment directly relates to safety reliability systems in electric systems. When short circuit fault occurs grid, over-current flows through devices will produce certain effects on equipment. Long-term cumulative effect many times faults cause significant influence key Currently, there is lack an effective quantitative analysis method current which aimed at (transformer, breaker, etc.) This paper presents a short-circuit model, based PSD-BPA...

An efficient analytical model has been developed for predicting the electromagnetic leakage field coupling with a lossless two-conductor transmission line (TL) through covered apertures of multiple enclosures. The results have successfully compared those from full-wave simulation software CST over broad frequency range. can be employed to analyze effect different factors including position and direction electric dipole, conductivity conductive sheet, quantity aperture, TL on induced...

An efficient analytical model has been developed for predicting the load response of a lossless transmission line (TL) in rectangular double-enclosure with multiple apertures covered by conductive sheets, excited an external plane wave oblique incidence. First, electromagnetic field enclosure is calculated using dyadic Green’s function and transfer impedance sheets against wave. Then, electric current induced at termination loads TL computed combination equivalent lumped-pi circuit Agrawal’s...

While conventional substation inspection has limitations in determining the status of electrical equipment, some abnormal cannot be alerted time. A new technology about real-time data transmission and early warnings was proposed this paper. It is based on 4G private network power system. Site staffs could transmit via view key information equipment by using virtual screens Google glasses. The includes manufacturer, ratings, last time operating data. method paper breaks through inspection....

An efficient analytical method based on the Cohn model and mirror procedure is proposed for prediction of shielding effectiveness (SE) a rectangular enclosure with electrically large apertures. Firstly, coupled electromagnetic fields are represented by equivalent dipole moments located at centre aperture according to model, where can be calculated procedure. Then, vector potentials obtained through relation between current distribution. Finally, total electric using potentials, thus SE most...