Materials Literature
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Summary form only given. Solid insulation surfaces in gas insulated high voltage (HV) equipment can be advantageous or dangerous with respect to dielectric breakdown by a discharge in the gas insulation, depending on whether the surface blocks the discharge (perpendicular, or dielectric barrier, configuration) or allo…
Laser plasma deposition or Pulsed laser deposition (PLD) is an attractive technique for growth of different materials for a variety of applications including thin films and nanostructures. The main advantage of using PLD for growth of materials is low cross contamination while controlling the stoichiometry of the mate…
Sub-wavelength superconducting rf meta-materials have evident advantages over their normal metal counterparts for strong diamagnetism, low-loss and intrinsically nonlinear tunability with temperature, dc magnetic, and rf electromagnetic field. These microwave properties are uniquely controlled through the spatial dist…
Barnacles are dominant hard–fouling organisms in marine waters. They attach to substrates by secreting a complex proteinaceous adhesive. Understanding the chemical composition of this multi–protein underwater adhesive and how it is affected by environmental variables, such as oceanic temperatures, is critical for deve…
Here we discuss the opportunity of using Ce-doped fluorite-type crystals as basis for amplitude photonic crystals with modulation of color centers absorption due to complex picture of the dynamic processes occurring in this medium under UV pump. The results of time resolved absorption saturation studies and key parame…
This special issue of the IEEE Transactions on Dielectrics and Electrical Insulation (TDEI) is devoted to Condition Monitoring and Diagnostics (CMD) of high voltage insulation systems, with special focus on highlights in research and engineering. Clear trend towards widespread and global diagnostics of insulation syst…
مکانیزم غالب شکست درآسیاهای غلتکی فشار بالا (HPGR)، شکست فشارشی است. جهت تحقیقات پایه و کاربردی شکست فشارشی، آزمایشهای ساده، سریع الانجام و دانش بنیان مورد نیاز است. بنابراین برای اولین بار در ایران با طراحی جدید و ساخت سیلندر و پیستون و همچنین پانچی برای جداسازی محصول مرکزی و محصول لبه، آزمایشهای شکست فشارشی با فشا…
The glass-ceramics containing non-linear optic Bi2GeO5-phase was produced by the heat-treatment of xBi2O3-yGeO2glasses doped with Yb3+. Both glasses and glass-ceramics were researched by X-ray diffraction analysis, optical and luminescence spectroscopy methods.
Summary form only given. Numerical thermalization induced by discrete-particle effects was observed in particle-in-cell (PIC) simulations1, which show that the thermal relaxation time scales with ND2and NDfor one-dimensional (1D) and two-dimensional (2D) models2, respectively. The parameter NDdenotes the number of par…
Optical nonlinearity of nematic liquid crystalline polymer caused by molecular reorientation was found and investigated. Under the action of light on the polymer film, director of polymer reorients to light field increasing the refractive index. If the polymer is doped with an azobenzene compound, nonlinear response d…
Wide band gap semiconductors like AlN typically cannot be efficiently p-doped: acceptor levels are far from the valence band-edge, preventing holes from activating. This means that pn-junctions cannot be created, and the semiconductor is less useful, a particular problem for deep Ultraviolet (UV) optoelectronics.
The formation and growth of silicon nanoparticles (SiNPs) (diameter4gas mixtures. Algorithms for the kinetics of nanoparticle formation were self-consistently embedded in a plasma hydrodynamics simulation to account for SiNP nucleation, growth, charging, and transport. A silicon hydride reaction mechanism was used to…
Transparent lithium alumosilicate glass-ceramics containing nanosized (8-15 nm) crystals of rare-earth orthoniobates, Yb, Tm:YNbO4, and β-quartz solid solutions are synthesized. Under the near-IR excitation by an InGaAs diode, they demonstrate intense near-IR upconversion luminescence at ~800 nm. The efficiency of Yb3…
We report on conical refraction (CR) experiments with low-coherent light sources such as light-emitting diodes (LEDs) that demonstrated different CR patterns. The change of a pinhole size from 25 to 100 μm reduced the spatial coherence of the LED radiation and resulted in the disappearance of the dark Poggendorf ring…
Intense long-lived NIR photoluminesce, centered at 920 nm was observed from the single crystalline specimens of RbY2Cl7ternary chloride, containing Bi+ impurity centers. This crystal phase can be crystallized from the stoichiometric Lewis acidic melt, which promotes the formation of Bi+ ion in sufficient concentration.
We have studied the UV reduction process of thin graphene oxide films, deposited on silicon substrate from ethanol suspension. Chemical structure of obtained material was analyzed by XPS method. TEM images showed holes formation during reduction process, that are connected into network. Films with observed structure h…
Graphene is a honeycomb carbon material which is now successfully applied as a channel in graphene FETs (GFETs) [1-5]. However, stability of modern GFETs is limited by a considerable hysteresis on the gate transfer characteristics [3]. Although several studies on this issue have been reported [3,6-9], different physic…
Epoxy/PAni composite films were prepared with 1 and 5 wt% of various additives: PAni powder only, epoxy powder surrounded by PAni (epoxy-PAni) and PAni powder surrounded by epoxy (PAni-epoxy). Results of dielectric relaxation spectroscopy showed that with 1 wt% of filler content in epoxy resin, irrespective of the typ…
For outdoor covered overhead lines, the service life normally depends on cable weathering and environmental stress. This paper presents the comparison of ageing deterioration of crosslinkable polyethylene compounds for outdoor covered overhead lines by using an accelerated weathering test. The effect of carbon black o…
The technology of quickly formation of bulk metamaterials with a complicated structure was designed. The bulk chiral metamaterial with a cell on the basis of helical element with a sufficiently large effective chirality parameter in the microwave frequency range has been constructed. It has been demonstrated experimen…