Materials Literature
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A giant concentration of nitrogen vacancy defects has been revealed by the electron paramagnetic resonance (EPR) method in a detonation nanodiamond sintered at high pressure and temperature. A high coherence of the electron spins at room temperature has been observed and the angular dependences of the EPR spectra indi…
In this paper an attempt is made to study accurately, the potential and electric field distribution for different types of ceramic disc insulators used for high voltage transmission and distribution systems. The computer simulations are carried out by using a commercially available software package. The potential and…
Previous studies of the surface plasmon resonance (SPR) from alloy nanoparticles of gold and silver have focused on bulk studies of the nanoparticles in solution. Here, we present a selection of data observed from individual alloy nanoparticles using highly spatially resolved electron energy-loss spectroscopy (EELS).…
This work aims at studying the role of interface properties on the rheological behavior of non-compatibilized and compatibilized polymer blends. Blends of polymethylmetacrylate (PMMA) with polystyrene (PS) and PS functionalized with oxazoline (PSOX) with concentrations of up to 20 w/w of the dispersed phase were used.…
This paper reports possible applications of microvaristor filled silicone rubber at composite insulators. Different insulator variations fitted with microvaristor filled sheds or shanks have been investigated. The insulators are dimensioned for Um= 170 kV and Um= 420 kV. Different variations of the 420 kV type were te…
Lactivicin (LTV) is a natural non-beta-lactam antibiotic that inhibits penicillin-binding proteins and serine beta-lactamases. A crystal structure of a BS3-LTV complex reveals that, as for its reaction with PBPs, LTV reacts with the nucleophilic serine and that cycloserine and lactone rings of LTV are opened. This str…
We conducted dynamic viscoelastic and birefringence measurements for dynamically homogeneous mixtures, polystyrene (PS)/4-pentyl-4′-cyanobiphenyl (5CB), to examine the orientational coupling between PS segments and 5CB molecules. It was also investigated whether dynamic homogeneity was correlated with orientational co…
Abstract A review is given on the effect of neutron irradiation on the microstructure and properties of Zr–Nb and Zr–Nb–Fe (Sn,O) alloys. The in-reactor performance of Zr alloys is dependent on their composition and microstructure, and even small changes in the composition and processing lead to substantial changes in…
Highly stable eta(2)-porphyrin Ru(II) pi complexes have been synthesized. The formation of the eta(2) pi bond has been facilitated through pi-pi stacking interactions between the porphyrin and the planar ligand on Ru. pi coordination of ruthenium to porphyrin results in dramatic changes in the aromaticity and electron…
Nephrogenic systemic fibrosis (NSF) is a recently described, debilitating systemic disease most commonly seen in patients with renal insufficiency. Exposure to gadolinium-containing contrast agent has been associated with the onset of symptoms. The epidemiology, pathogenesis, clinical manifestation, diagnosis, histolo…
Introduction. Rhizopus stolonifer is the causal agent of Rhizopus rot disease in various fruit and vegetables. Materials and methods. The effect of chitosan was evaluated in vitro on mycelial growth, sporulation, morphological characteristics and germination of spores of three isolates of R. stolonifer (from peach, pa…
It is shown by microindentation that the defect structure of nanocrystalline titanium obtained by rolling at low temperature is quite uniform. The presence of texture was manifested as a small difference of the average values of the hardness H¯V and the standard deviation in the measurements in the roll plane and in a…
X-ray single crystal structure analysis has become a gold standard for the determination of molecular geometry. The reliability of the technique is a triumph for science and technology working together. The uniqueness of well-crystalline material intrigued early natural philosophers, and their examinations, followed b…
The dielectric behaviour of nano-SiO2filled low density polyethylene is investigated over a frequency range of 10 mHz-10 MHz and for different temperatures from 250 K to 350 K. It is shown that the presence of nanoparticles change significantly the dielectric behaviour of the polymer system. The frequency variations o…
Well-crystallized pure hexagonal phase YBO(3):Eu(3+) nanoparticles are prepared by the reverse micelles method. Vacuum ultraviolet photoluminescence (VUVPL) spectroscopy showed size-dependent nonlinear luminescence enhancement with remarkably improved chromaticity (0.62, 0.34), as compared to the commercial bulk YBO(3…
X-ray computed microtomography reveals the internal features of pearls with great detail. This method is useful for identifying some of the natural or cultured pearls that are difficult to separate using traditional X-radiography. The long measurement time, the cost of the instrumentation, and the fact only one pearl…
A brief review of the charge packet phenomena is presented with the aim of identifying the generalities underlying the phenomena, in particular its connection with the well-known soliton phenomena will be explored. The physical mechanisms that may cause it will be evaluated in the light of the experimental evidence, a…
In order to improve the often slow reaction kinetics associated with many metal hydride hydrogen storage materials, we must first develop a detailed understanding of the limiting kinetic mechanisms associated with the materials in question. We used in situ x-ray diffraction to monitor hydride formation in highly contr…
Al-0.61wt%Fe and Al-1.9wt%Fe alloys were atomized in helium and nitrogen atmospheres, using impulse atomization. The microstructure of the droplets atomized in helium and nitrogen were characterized using a number of techniques including X-ray diffraction, micro-tomography and scanning electron microscopy (SEM). In bo…
On Two Nanocomposite Models: Differences, Similarities and Interpretational Possibilities Regarding Tsagaropoulos' Model and Tanaka's Model Nanocomposites consist nowadays a major field of research. This paper investigates the interpretational possibilities of two models developed, namely, Tsagaropoulos' model and Tan…