Materials Literature
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Results of permanent magnet synchronous motor design calculations are presented in the paper. This motor is proposed for the longwall shearer advance drive. The authors have described the advantages of permanent magnet motors, presented most common designs of rotors and explained field-circuital method which was used…
For a future energy sector, hydrogen is considered a clean alternative to other fuels. As an ideal secondary energy carrier it can be produced from renewable energy sources (e.g., solar, wind, biomass, etc.), and converted very efficiently to electricity in fuel cells, emitting only water. However, one of the main obs…
Progress in the understanding of the resonance phenomena able to concentrate the electromagnetic-wave power at the nanoscale opens ways to miniaturize various devices important for advanced photonic, optoelectronic and sensing applications. One of such devices is the plasmon-assisted nanolaser. The first demonstration…
Abstract We report the design and fabrication of an electrooptical, tunable, liquid crystal‐based lens and analysis of its performance. The lens obtains its gradient index (GRIN) profile from multielectrode addressing using a layer with high dielectric constant to extend and smoothen out the horizontal electric field…
This paper presents results of the numerical analysis characterizing the scattering and generation properties of nonlinear layered structures. Two-sided acting fields at the scattering frequency were taken into account and a type-conversion of the oscillations could be observed. The latter effect was observed at a sym…
This paper presents promising current-voltage characteristics of semiconductor-insulator-graphene tunnel diodes as the hot-electron injection unit in graphene base transistors (GBTs). We propose that by using a bilayer tunnel barrier one can effectively suppress the defect mediated carrier transport while enhancing th…
In this paper, we report the low-frequency noise characterization of CVD -grown Graphene FETs (GFET). Low-frequency measurements indicate a dominant contribution of 1/f noise in the drain current noise source. A quadratic dependence of the drain current-noise on drain current is observed. An overall comparison between…
In this work the effect of biaxial and uniaxial strain on the mobility of single-layer MoS2at room temperatures is comprehensively studied. Scattering from intrinsic phonon modes, remote phonon and charged impurities are considered along with static screening. Ab-initio simulations are utilized to investigate the stra…
In the paper on the basis of the finite-element method the possibility to create a broadband polarizer in an aperture of an antenna array for operation in a sector of scan angles of ±45° and more is shown. The calculations of angle responses and radiation patterns of the developed model of a broadband four-grid 45° ro…
This paper is dedicated to the memory of brilliant Georgian scientist, working in electrodynamics theory, Professor G. Sh. Kevanishvili, who passed away in June 27, 2015, 2 days after his 86th birthday. The scientific interests of G. Sh., his main journal and conference papers and books have been listed and evaluated.…
The problem of axially-symmetric electromagnetic wave diffraction by a perfectly conducting bi-conical surface, one arm of which is a semi-infinite cone and the other is a semi-infinite truncated cone, is solved rigorously using the mode-matching method and the analytical regularization technique. The bi-cone is excit…
Growth of mono-dispersed AlGaN nanowires of ternary wurtzite phase is reported using chemical vapour deposition technique in the vapour-liquid-solid process. The role of distribution of Au catalyst nanoparticles on the size and the shape of AlGaN nanowires are discussed. These variations in the morphology of the nanow…
We devise a data-fusion method based on the concept of Hybrid Systems that use oil-in-gas measurements from collected insulating oil samples and acoustic emission monitoring data to increase the knowledge of the operating conditions of power transformers. The resulting failure mode probabilities portray not only the p…
We use density-functional-based tight binding theory, coupled to a Poisson solver to investigate the dielectric response in oxidized ultra-thin Si films with thickness in the range of 0.8 to 10.0 nm. Building on our recent work on the electronic structure of such Si films using the same formalism, we demonstrate that…
This paper presents a new moveable power quality (PQ) conditioner named convertible active power filter (CAPF) which aims to compensate for current quality (CQ) problems in the industrial, commercial or residential areas. The proposed CAPF has the capability and flexibility to change its compensation mode from load-to…
We investigate the applicability of density functional tight binding (DFTB) theory [1], [2], coupled to nonequilibrium Green functions (NEGF), for atomistic simulations of ultra-scaled electron devices, using the DFTB+ code [3], [4]. In the context of ultra-thin silicon-on-insulator (SOI) transistors we adopt atomic m…
This work presents measurements of the static magnetization processes of non oriented electrical steels usually used for the electrical machines. The experimental results obtained can be used as a benchmark for the identification procedures of phenomenological models used for the representation of the magnetic behavio…
We describe the first parallel algorithm to obtain Cartesian coordinates of a molecular structure from internal coordinates. This algorithm is important for problems such as protein engineering and fitting protein structures to experimental data. Proteins contain thousands to millions of atoms. Their positions can be…
This paper addresses the limitation of linear winding and needle winding of outer stators for electric drives. A new winding technology based on conventional needle winding is introduced and discussed. Winding heads customized to fit the new process are presented and their geometry is explained. The corresponding wind…
It is reported in the literature that electrical-field enhancements can appear in irregular deformed wave-guides. Using Maxwell's equations it is rather difficult to find analytical solutions for these arrangements. On the other hand, it is long been known that wave-guides can be approximated by systems of transmissio…