Materials Literature
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Corrosion of lead silicate glass (LSG) contacting 0.5 M aqueous nitric acid (HNO3) was investigated via scanning electron microscopy, energy-dispersive spectroscopy, inductively coupled plasma analysis, and weight-loss measurement to determine the respective contributions of the ion-exchange vs. the hydrolysis reactio…
Indium tin oxide (ITO) and related oxide based materials have been widely used as transparent electrode in optoelectronic devices and organic solar cells. Here, we demonstrate application of chemical vapor deposited (CVD) graphene films as transparent electrode for organic solar cells. Large area graphene films are de…
This article briefly reviews recent developments of Landau-Ginzburg theory to ferroelectric phase transitions in superlattices. An overview of the contributions of Landau-type theory to study ferroelectric superlattices is given. Recent findings from first-principles calculations and experiments on intermixing, local…
A detailed study of the effect of grain size reduction on the spin glass like phase in Nd0.8Sr0.2MnO3 has been carried out. A rigorous measurement of linear and non-linear ac magnetic susceptibility in the bulk-like Nd0.8Sr0.2MnO3 confirms the existence of a glassy phase in the low temperature regime. The effect of si…
Optical losses by reflection and transmission of the incident light should be reduced to improve the efficiency of solar cells. Compared with antireflection coatings, surface texturing is a more persistent and effective solution aiming at reducing light reflection losses. Alkali (NaOH, KOH) or acidic (HF, HNO 3 , CH 3…
ZnO/Zn1−xMgxO single quantum wells (SQWs) were grown by plasma-assisted molecular beam epitaxy on c-plane sapphire substrates. Compositional grading allows the application of optimized growth conditions for the fabrication of Zn1−xMgxO barriers with high crystalline quality and a maximum Mg content of x = 0.23. High r…
It is necessary to develop a fast and inexpensive fabrication process of vertical electric wiring by through-silicon via (TSV) technology for advanced three-dimensional semiconductor devices. In this research, a fast-forming conductive composite was successfully developed by simultaneous deposition of conductive organ…
Abstract The crystal structure of the rare skarn mineral trabzonite, Ca 4 [Si 3 O 9 (OH)]OH, from the type locality near Ikizdere, Turkey and from the Upper Chegem caldera, Northern Caucasus, Kabardino-Balkaria, Russia has been solved and refined using single-crystal X-ray data. This shows that the chemical formula sh…
In this work sodium bisulfate was used as a blocking agent to block polymethylene polyphenylisocyanate (PAPI). The particle size distribution rate and the factors influencing the stability of the blocked isocyanate emulsion were studied by varying the stirring speed. Furthermore the blocked isocyanate was characterize…
Barium titanate (BTO) thin films were deposited on polycrystalline Ni foils by using the polymer assisted deposition (PAD) technique. The growth conditions including ambient and annealing temperatures were carefully optimized based on thermal dynamic analysis to control the oxidation processing and interdiffusion. Cry…
We investigate the carrier transport properties of multilayer graphene with a turbostratic structure grown by chemical vapor deposition (CVD). The observed sheet resistivity of field effect transistors using the grown multilayer graphene (GG-FETs) with a turbostratic structure as a channel is almost constant at any te…
The effect of heat treatment on the abrasive wear behavior of high chromium cast iron (NF253AHT) under dry sliding condition has been investigated. Rectangular cross sectioned samples of the alloy were produced by sand casting. After casting, the samples were machined to equal dimensions of 50 mm x 15 mm x 10 mm and h…
The purpose of this study was to measure temperatures of cotton and polyester woven fabrics in wetting and drying process by thermocouples placed on them. It also discussed temperature distribution caused by difiusion and evaporation at difierent relative humidity. The measurement points of thermocouples were located…
An investigation of magnetizing current waveforms of single phase power transformer due to DC bias injection through simulation and experimental study is present in this paper. A method base on MATLAB simulation that is capable of predicting of magnetizing current without and with DC bias is used. The experimental stu…
The main objective of this paper is to study numerically the influence of addition of 6 booster sheds (BS) to 2 units of EHV porcelain post insulator on their electrical performance under severe wet-grown ice accumulation based on experimental results. The numerical investigations have been carried out during melting…
Heat management at nanoscale is a critical issue across many areas of science and engineering, where the size effect of thermal properties plays an important role. We measure the transient thermoreflectance signals of thin metal films with thicknesses from 50 to 200 nm by using the femtosecond laser pump and probe met…
The main objective of this study is to investigate the feasibility of using an RF antenna to detect partial discharges in outdoor insulators. Moreover, the study focuses on identifying the sources of partial discharge using artificial neural networks. In outdoor insulators, partial discharges could be initiated either…
Measuring partial discharge according to IEC60270 is a well established and widely accepted method. Unfortunately it presents some limitations especially when it is necessary to monitor the system under load conditions and when the localization of the discharge sources is demanded. To overcome these problems, other te…
Extending fuel cell lifetime is a necessary objective for reducing fuel cell power generation cost of electricity. Capital costs comprise the most significant fraction of the cost of electricity. Reducing the frequency of fuel cell replacement can be achieved by implementing a control strategy that prevents excursions…
The functionalization of polyoxometalates (POMs), especially with an amino group to yield organonitrogenous derivatives of POMs, is an efficient approach to the enrichment of their structures and the diversification of their properties for various applications. The mechanism for the formation of organonitrogenous-deri…