Materials Literature
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Theoretical investigations to study the effect of doping of hetero-atoms on the growth and field emission properties of Carbon Nanotubes (CNTs) tip placed over a cylindrical surface in complex plasma have been carried out. A theoretical model incorporating kinetics of plasma species such as electron, ions, and neutral…
The paper presents two identification methods of parameters for the Johnson-Cook constitutive equation. The Johnson-Cook equation is one of the most popular semi-empirical constitutive models to describe the equivalent of plastic stress-strain curves. The first presented method is the approximation method of plastic h…
We have studied IR transmittance spectra of a multiferroic TbMnO3. Three phase transitions (T N = 43 K, T FE = 28 K, and T Tb = 7 K), which manifest themselves in a shift of the absorption band edge of manganese and in changes in the spectral parameters of lines of f-f transitions of terbium, have been detected. An in…
Modern optical partial discharge (PD) detection system based on fiber-optic sensors for PD on-line health monitoring in high-voltage (HV) cable terminations necessarily requires optically transparent or translucent insulation materials. The optically compatible silicone rubbers are the key to facilitate such innovativ…
Concentrating Photovoltaics (CPV) aims to reduce the cost of photovoltaic applications by replacing part of the semiconductor material with a less expensive concentrating material. The significant increase in irradiance and the related reduction of semiconductor area introduce some criticisms that affect the design, f…
The calcinations temperature is one of the important process parameter which influences the changes of magnetic properties in ferrites. This study provide better understanding of the influence of calcination temperatures on the magnetic properties of Nickel Zinc ferrite consequently enable to tailor the magnetic prope…
Space charge accumulation is a key factor concerning the safe operation of HVDC cables. In order to investigate space charge behavior of HVDC cross-linked polyethylene (XLPE) cables, degassed specimens as well as fresh specimens obtained from HVDC XLPE cables before and after type tests were tested by PEA measuring sy…
Niobia is used as a sintering additive in alumina processing because it lowers the sintering temperature. This work investigated the influence of sintering dwell time at 1400oC on the properties of 4 wt% niobia doped alumina. The sintered ceramics were characterized by scanning electron microscopy (SEM), and X rays di…
Silver nanoparticles, which have found a wide range of applications owing to their antimicrobial properties, are also recommended as dietary supplements in alternative medicine. Studies on rodents confirm that nanosilver is absorbed from the digestive tract into the bloodstream, which implies its possible interactions…
Abstract Highly birefringent liquid crystals have always been desired by many applications in visible, infrared and recently other spectral regions such as THz and GHz as a active medium for various devices fabrication eg. light shutters, shifters, attenuators, filters, electronic lenses, delay lines, antennas, varact…
The development of novel composites is ongoing in an effort to develop materials with an energy density greater than 5 J/cm3for use in high voltage capacitors. The materials are composites initially developed to reduce the size of high power antennas. Due to their combination of a high dielectric constant and high die…
In this work, the structural properties of radio frequency sputtering-grown zinc oxide (ZnO) thin films on sapphire (Al2O3), gallium arsenide (GaAs) and n-type silicon (Si) substrates were characterized. Scanning electron microscopy was employed to study the surface morphology of the samples. X-ray diffraction (XRD) m…
This paper presents the measurement of the needle thread tension in an industrial sewing machine using various sewing threads.In this work, three types of sewing threads, air-jet textured (PET), core-spun (PET/PET) and (PET)-spun were used.Two lubricant types and two lubricant feeding rates were applied to these sewin…
Abstract Radially oriented Nd–Fe–B ring magnets were prepared by backward extrusion of MQ‐C powder. The punch chamfer radius has a great impact on the microstructure and magnetic properties of the ring magnet. With the chamfer radius changing from 2, 5 to 8 mm, the cracks in the inner wall decrease obviously while the…
Sepiolite is a fibrous sheet silicate with a composition of Si~12~Mg~8~ (H~2~O)~4~(Si~6~O~15~)~2~(OH)~4~ · 8H~2~O and has significant physicochemical and rheological properties due to the presence of zeolitic channels in its structure. The highest concentrations of sepiolite worldwide are found in the Madrid Miocene B…
Abstract The crystal structure, H bonding and chemical composition of hydroxylherderite from the Bennett pegmatite, Buckfield, Oxford County, Maine, USA were investigated by single-crystal X-ray diffraction and neutron Laue diffraction, electron microprobe analysis in wavelength-dispersive mode, inductively coupled pl…
Fast and repetitive switching in high-power circuits is a challenging task where the ultimate solutions still have to be found. Areas of application are pulsed power technology and power stations. We proposed a new approach. Supercritical fluids have insulation strength and thermal properties like liquids and fluidity…
In comparison to the previous researches, ZrO2 nanoparticles with higher surface area (85 m2/g) have been synthesized in this research. The as-prepared ZrO2 nanoparticles by co-precipitation method were characterized with X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy…
Magnetic shape memory alloys (MSMA) has become a potential candidate in many engineering fields. MSMA has advantage of huge strain, which is much larger than other materials. Besides, it has properties of lightness and high frequency response. All of these characteristics make MSMA as a good choice in micro engineerin…
Trivalent terbium-doped lutetium-aluminate nano-garnet (Lu3Al5O12:Tb3+) powder was prepared by using the Pechini sol-gel process. The structure and crystallinity of the Lu 3 Al 5 O 12 :Tb 3+ nano-garnet were characterized by using X-ray diffraction, transmission electron microscopy and Fourier transform infrared spect…