Materials Literature
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The authors investigated certain physical effects that complicate the use of radiated emission test data at one test distance to predict the results at a different distance.
This paper presents an improved wide color-gamut technique for liquid crystal modules (LCM) with multiphosphor white (MPW) light emitting diodes (LED) and an modified rich color image processing method. The MPW LED improves 13% of the display color gamut in comparison with standard white LED under the assumption of eq…
Decision on selecting a material or process for a particular product is a common task in product engineering and facility planning. Such decision may have a significant impact on entire product life cycle including raw material acquisition, product manufacture, use, disposal, and environment. Traditional factors for d…
A simple route has been developed for the preparation of a series of one-dimensional rare earth (Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb) precursors by solvothermal treatment of corresponding rare earth nitrate in mixed solvents of N,Ndimethylformamide (DMF) and water at 200 °C without using any surfactant o…
Surface conductive composites consisting of polyamide 6 (PA-6) polymer films and conductive polyaniline (PANI) particles were chemically elaborated by in situ polymerization of aniline inside the PA-6 matrix, at room temperature. The obtained composites were investigated regarding to their electrical properties. We ha…
The concentration dependence of the Curie constant in the magnetic susceptibility of impurities of transition elements in a nonmagnetic matrix is considered for the case where the energy level of an impurity electron falls into the conduction band and hybridized states arise. As a result of an analysis of the new expe…
The excitation spectra with the vibronic structure near the 360 nm absorption band and emission spectra with the vibronic structure near the 430 nm emission band have been studied comparing neutron irradiated α-Al2O3 at pile temperature (360 K) and at 20 K. In particular, the optical vibronic emission spectra of the n…
Sugilite, ideally KNa(2)(Fe(3+),Mn(3+),Al)(2)Li(3)Si(12)O(30), from the Wessels mine, Kalahari, South Africa, was studied using (57)Fe Mossbauer spectroscopy. The spectra confirm published electron-microprobe data and X-ray single-crystal results, which indicate that Fe(3+) is ordered at the A octahedral site. The mag…
Three major cause of failure had been established for bushings with over 20 years of service namely: seals damaged, leaks at expansion gas chamber and corrosion at bushing tap. In the paper, each root cause of failure is illustrated with true faults occurred while in service. Then detailed analysis is presented, and m…
The dependence of the hardness of basaltic glass-ceramics on their degree of crystallisation has been explored by means of differential scanning calorimetry, optical microscopy, x-ray diffraction, and Vickers indentation. Different degrees of crystallisation in the basaltic glasses were achieved by varying the tempera…
The aim of this work was to investigate the excimer laser action (λ = 248, T = 20 ns) on the ultrananocrystalline diamond films grown by CVD technique with different nitrogen gas phase content (0% and 30%). The origin of the films ablation was found to be strongly dependent on laser fluence. A high radiation intensity…
Nickel hydroxide was prepared by electrodeposition in Ni(NO3)2 aqueous solution for the electrode materials of supercapacitors. The structure and morphology of products were characterized using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM), respectively. The experimental results of XR…
Discussed in the paper is the aging evaluation of silicone rubber nanocomposites for overhead insulation applications. In the work, various micro-nano composites are prepared for study with microflller, nanoflller, and the combination of microflller and nanoflller with a commercial surfactant to improve the dispersion…
In this paper, we address some poorly explained problems associated with electrical properties of dielectric polymers. Charge injection is often unclear due to metal-polymer interfaces phenomena including poor contacts, asperities and electrochemical reactions. We also review some difficulties involving the sample bul…
The thermal history of a material with initially filled trap states has been probed using the thermoluminescence of microparticle sensors. Mg2SiO4∶Tb,Co particles with two thermoluminescence peaks have been heated using microheaters over a 230°C to 310°C range for durations of less than 200ms. The effect of maximum te…
During operation, high voltage insulators may severe a certain degree of pollution which may reduce their performances such as surface resistance and flash over voltages. Under these conditions a large leakage current (LC) may flow on the surface and degradation may take place. The LC waveforms are normally non-pure s…
A simple and economical powder metallurgy forming process known as warm compaction was employed to fabricate a Cu-Ti3SiC2 particulate reinforced copper matrix composite for electro-friction purpose. Copper matrix composites reinforced with 5, 10, 15 mass% Cu coated Ti3SiC2 particulate were prepared by compacting the p…
The transient optical nonlinearity of a nematic liquid crystal doped with azo-dye DR19 is examined. The optical reorientation threshold of a 25-μm-thick planar-aligned sample of 5CB using a 50 ns pulse duration 532 nm YAG laser pulse is observed to decrease from 800 mJ/mm 2 to 0.6 mJ/mm 2 after the addition of 1 vol%…
Soufrière Hills volcano is an active andesitic volcano located in the south-central part of Montserrat Island, West Indies. Phosphorus (P)-rich ash emitted from the Soufrière Hills volcano is expected to have effects on P retention and distribution in highly acidic soils surrounding the areas inundated with ash for se…
The interfaces of dissimilar materials suffer high stress gradients due to the presence of thermal and stiffness mismatches of bonded materials. Interfaces of dissimilar materials are prone to crack initiations, leading to delaminations. The atomistic effects have to be taken into account correctly when the system bec…