Materials Literature
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In this contribution, data from experimental investigations are used to develop a numerical model allowing studying the impact of mineral oils degradation on the cooling of layer-type windings power transformers. From the obtained results, it was confirmed that oil decay products, especially sludge formation are also…
In recent years, fabrication of polymeric antibacterial wound dressing has gained most attention in controlling wound infections. Silk is also a member of the broad family of protein-based polmers. The silk produced by the lepidopteran insect Bombyx mori is a highly accepted material due to its long history as a very…
This work is devoted to determining the size of the particles of calcium carbonate by utilizing two independent instrumental methods (dynamic light scattering and light microscopy) in the range of 0.8 nm and 0.1 mm during the process of crystallization. The dependence of particle size on the time allows to determine t…
Graphene, a single layer of carbon atoms in a two-dimensional honeycomb lattice, have attracted tremendous attention from researchers in recent years, due to its excellent electrical, mechanical and optical performances. However, preparation of grapheme with simple methods is still a huge challenge. In this paper, gra…
GaN-based devices are of increasing importance for a wide range of system applications, such as power conversion and control, displays, and sensing in harsh environments. While dramatic progress in material quality and device performance has been achieved, several key impediments to the widespread adoption of GaN rema…
There was a need to perform induced overpotential tests with partial discharge measurements as well as ratio and phase angle accuracy measurements on eight 550 kV inductive voltage transformers. This required the voltage transformers to be energized from the high voltage winding. The induced test at 120 Hz was accompl…
Engineering thermoplastics are widely used as insulation material for low voltage products. The requirements becoming more and more demanding. For high temperature applications the performance of standard Polyamide (PA) and Polybutylene terephthalate (PBT) is insufficient. It is well known that crosslinking by electro…
Recent advances in the fabrication of two dimensional heterostructures have facilitated the study of resonant tunneling based interlayer tunnel FETs (ITFETs) which offer the possibility of sharp negative differential resistance (NDR) characteristics [1-3]. More recently, a new technique whereby rotational alignment of…
The most interesting examples of various double-layer metamaterials that provide “optical activity” are presented to reveal the motivation of use of different cell topologies. The phenomena of the giant “optical activity”, existence or lack of perfect matching, multi-band phenomena, the role of higher space harmonics,…
Nanosecond and femtosecond laser impulses applied to the stable aqueous dispersion of shungite carbon nanoparticles brought to increase in the average size of clusters and to drastic changes in structure of shungite carbon that were obtained from its Raman spectra decomposition.
We report direct visualization of spatially localized excitations in an array of 27×27 coupled rf-SQUIDs forming a magnetic meta-surface for electromagnetic wave propagation. The technique of low-temperature Laser Scanning Microscopy (LSM) is applied to investigate contributions of individual meta-atoms to the macrosc…
Numerically and experimentally demonstrated the appearance of the Tamm States peak in the band gap of a planar photonic crystal. The increasing of quality factor as well as Tamm State frequency falling with rising of inhomogeneity length is demonstrated.
Direct water cooling of stator windings has been common since the early 1960s. In general these windings have performed well, although as would be expected in any liquid system involving many varied components, there have been problems with leaks, leaks both large and small, and copper oxide build-up. This paper will…
For investigating combined grid systems including electrical, thermal and chemical grids, a scientific approach based on Hardware-in-the-loop simulation is carried out where models as virtual energy components are coupled with experimental facilities. In this contribution, a bidirectional fuel cell system is described…
Analysis of the electrodynamical properties of the infinite periodical grating without one strip is performed in this paper. The H-polarization case is considered. The mathematical model is based on the singular integral equations method. Scattered field is presented as sum of three summands: field of the infinite per…
The article is devoted to the realization of contact method of measuring of amplitude of mechanical vibrations of ultrasonic frequency. Results of developing of piezoelectric receiving transducer for measuring of amplitude of vibration of working instrument of ultrasonic vibration system.
Our report presents the model data supporting unusual design of the extremely low frequency (FLF = 3- 3000 Hz) vertical electric antenna. This “tree” or “wooden” antenna is a pair of electrodes fixed at a tree trunk at different heights (a few meters apart). The antenna is intended for measurements of the vertical ele…
Summary form only given. Electrical breakdown between electrodes in the presence of a dielectric cylinder is simulated using an electrostatic particle-in-cell (PIC) code that models particle-particle collisions using the direct simulation Monte Carlo (DSMC) method. In this talk we will present recent work on sensitivi…
The article is devoted to the integration of control system of cavitation mode into the ultrasonic technological equipment intended for the action on liquid technological media. It shows the results of studies of operating efficiency of the ultrasonic equipment with the control system.
The most practiced and acceptable approach to improve the power quality of distorted distribution networks is to install active power filters (APFs) at the point of common couplings (PCCs) of nonlinear loads. This approach has proven to be very effective since APFs fully compensate for the injected current harmonics a…