Materials Literature
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Abstract High-chromium cast irons are used as abrasion resistant materials. Their wear resistance depends on quantity of carbides and the matrix supporting these carbides. The paper presents the results of cast irons of chemical composition (in wt. %) 19–22 Cr and 2–4.5 C alloyed by 1.7 Mo + 5 Ni + 2 Mn to improve the…
Segmental mixing has been speculated to affect the gas transport properties of phase-separated polyurethanes. However, in most of the studies in this field the effect of this factor has not been independently evaluated. Therefore, in this study, varying the solution casting temperature was utilized to induce changes i…
So-called `time-of-flight' (TOF) measurements have been employed for locating PD sources within GIS for over 20 years. Portable digital sampling oscilloscopes have now become available for reasonable cost whose input rise-times, bandwidths, and sampling rates are theoretically sufficient to provide spatial resolution…
Guest editor Claudio Pettinari highlights the popularity and versatility of poly(pyrazolyl)borate ligands, introduced by Swiatoslaw “Jerry” Trofimenko 50 years ago, and summarizes the diverse ways in which these ligands are used in the research reported in this special issue.
Abstract The influence of extreme heat loads, as produced by a multiple pulses of non-homogeneous fl ow of slow plasma (0.1-1 keV) and fast ions (100 keV), on double-forged tungsten (DFW) was investigated. For generation of deuterium plasma and fast deuterons, plasma-focus devices PF-12 and PF-1000 are used. Depending…
Comparisons between adsorption and diffusion of alkali, alkaline earth metal atoms on silicene and those on silicane: Insight from first-principles calculations* , Xu, Bo, Lu, Huan-Sheng, Liu, Bo, Liu, Gang, Wu, Mu-Sheng, Ouyang, Chuying
We explore the use of a class of metasurface (MTS), which consists of metalized cylinders arranged in a square lattice and placed on a ground plane, for the realization of antennas at terahertz (THz) frequencies. This MTS is particularly appropriate for being micromachined out of a silicon wafer by means of deep react…
The design process for transparent conductive aluminum zinc oxide film AZO is presented in this document. The optimized RF conductivity and light transmittance properties of such film make it an attractive candidate for transparent antennas that are proposed for integration with solar cells.
The main purpose of this paper is to describe a novel power management control strategy for battery and supercapacitor hybrid energy storage system with the objective that the load power demand would be distributed into the energy storage devices in a way that each device can be utilized optimally. The paper describes…
To study the influence of temperature on partial discharge (PD) statistics and endurance of inverter-fed motor insulation, experiments were carried out focusing on enameled wires tested under bipolar repetitive square wave voltages at different temperatures. The PD pattern, delay time, amplitude and life were obtaiaed…
Thermochromic absorber coatings, which switch their emissivity for thermal radiation depending on temperature, are developed to reduce the stagnation temperature of solar thermal collectors: In the operating range of the collector, the surface exhibits a low emissivity (ɛ = 10%). At higher temperatures, the emissivity…
The lightweight and 3-dimensional reticulated α-Fe2O3/PPy hybrids were successfully fabricated via a facile one-pot polyreaction. The measured complex permittivity and microwave attenuation performance suggest that the dielectric properties of PPy can be regulated by the mass ratio of added α-Fe2O3. The two dielectric…
Ordered mesoporous silica SBA-15 was prepared using hydrothermal synthesis using sodium silicate (Na 2 SiO 3 ) as the silica source and amphiphilic block copolymer Pluronic P123 as the structure directing agent. The influence of the mass Na 2 SiO 3 , ripening duration, aging time and calcination temperature on the str…
Scrolled packings of single-layer and multilayer graphene can be used for the creation of supercapacitors, nanopumps, nanofilters, and other nanodevices. The full atomistic simulation of graphene scrolls is restricted to consideration of relatively small systems in small time intervals. To overcome this difficulty, a…
Magnesium and its alloys are finding increasing use in aerospace, automobile, nuclear, electrical, and structural engineering applications because of their high strength-to-weight ratio when compared to aluminum, titanium, and steel. In this work, AZ61 wrought magnesium alloy was processed using equal channel angular…
High quality single crystal Fe3O4 thin films with (111) orientation had been prepared on amorphous SiO2 substrate by pulsed laser deposition. The magnetization properties of the films are found to be unconventional. The Verwey transition temperature derived from the magnetization jump is around 140K, which is higher t…
In this work, poly(lactic acid) (PLA)/cellulose-nanowhisker (CNW) nanocomposites were prepared by twin-screw extrusion followed by injection moulding. The CNW was dispersed in a plasticizer/compatibilizer (PL) before the melt mixing process. It was found that the PL not only improved the processability and reduced the…
This study evaluated the potential of rambutan peel (Nephelium lappaceum), an abundant, renewable and low-cost waste, as a source of lignocellulose for technological applications. FTIR analysis confirmed the achievement of lignin, hemicellulose and cellulose. It has obtained an extract with antioxidant properties by s…
We investigate the film thickness dependent metal-to-insulator transition temperature $({T}_{\mathrm{MIT}})$ of $\mathrm{NdNi}{\mathrm{O}}_{3}$ films under tensile and compressive strain states. For the films exceeding the critical thickness for strain relaxation, ${T}_{\mathrm{MIT}}$ varies gradually with the film th…
Abstract Hydrated halloysite was discovered in books, a morphology previously associated exclusively with kaolinite. From ∼1.5 to ∼1500 μm in length, the books showed significantly greater mean Fe contents (Fe2O3= 5.2 wt.%) than tubes (Fe2O3= 3.2 wt.%), and expanded rapidly with formamide. They occurred, along with ha…