Materials Literature
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The aim of the work has been to prepare ceramic coatings containing the ZrO 2 phase on a Mg alloy by micro-arc oxidation technique. The phase composition of the coatings was examined with X-ray diffraction. The surface morphology and the elemental distribution of the coatings were studied with scanning electron micros…
Abstract The microstructural, mechanical and magnetic properties of FeCr25Co15 alloy were examined after upset followed by torsion. Deformation was carried out at temperatures that corresponded to the appearance of α + γ phases. During the process, the initial lamellar microstructure of the material was transformed in…
To prevent carbon/carbon (C/C) composites from oxidation at high temperatures, a SiC whisker (SiCw) toughened MoSi 2 –SiC–Si coating was prepared on the C/C surface by a two step technique of slurry and pack cementation. Scanning electron microscopy (SEM) analysis shows that, with the content of SiCw increasing, the d…
Nucleophilic replacement of chlorine atoms in tetrachlorophthalonitrile by the action of primary and secondary amines was studied. The reactions of tetrachlorophthalonitrile with amines at a ratio of 1: 10 gave with high yields and regioselectivity the corresponding 4,5-diamino-3,6-dichlorophthalonitriles from cyclic…
SiO2:PbS nanoparticle phosphors were successfully prepared by a sol-gel process. The crystallized lead sulphide (PbS) nanoparticles inside the amorphous silicon dioxide (silica, SiO2) matrix were examined by X-ray diffraction and transmission electron microscopy (TEM) to estimate the particle size and distribution. Th…
The phase diagram of the system Mn2−xFexAs0.5P0.5 under pressure is investigated experimentally and theoretically. It is found that the spontaneous and magnetic-field-induced low-temperature phase in the region 0.5⩽x<0.8 does not suffer significant changes under hydrostatic pressure up to 2kbar. Based on ab ini…
Abstract The definition of “noncrystallographic symmetry” given in Volume B of the International Tables for Crystallography actually corresponds to the concept of “local symmetry”. A new definition of “noncrystallographic symmetry” is proposed, which fully complies with that of “crystallographic symmetry” in Volume A…
Thermal characterisation of thermal interfaces becomes even tougher a challenge at low bond line thicknesses and higher thermal conductivities of the interface materials as more accurate measurement techniques are required. As in parallel the quest for high conductivity adhesives and greases is ongoing, a correlation…
An aged silicone polymer insulator, which had been used at testing station near sea coast for approx. 10 years, was investigated. The aging mode was different from erosion. It was confirmed that the rubber aging phenomena was similar to damage due to nitric acid by FT-IR analysis. It is deemed that the acid was genera…
1-Acetyl-3-(4-chlorophenyl)-5-(4-methylphenyl)-2-pyrazoline has been synthesized and characterized by elemental analysis, IR and X-ray single crystal diffraction. Density functional (DFT) calculations have been carried out for the title compound by using the B3LYP method at the 6-311G** basis set level. The calculated…
A method is derived for the determination of the static dielectric permittivity of ion conducting materials when this parameter is obscured by electrode polarization in as-recorded low frequency dielectric spectra. The method requires permittivity measurements at two different electrode separations, and is applicable…
The speciation and reactions of palladium(II) complexes with meso -tetraphenylporphine (H 2 TPP) and meso -tetraphenyl-β-octaethylporphine (H 2 TetPOEP) were studied in H 2 SO 4 -H 2 O and H 2 SO 4 -HOAc protic solvents. H-associated species of PdTPP and PdTetPOEP were found to exist in sulfuric acid with concentratio…
Chitosan complexes that meet the performance criteria of water-soluble nonstoichiometric polyelectrolyte complexes have been first prepared via the interaction of chitosan with excess polystyrenesulfonate anions in acidic media. Thus, the region of the existence of soluble complexes can be narrowed down through a decr…
Palladium 3,7,13,17-tetramethyl-2,8,12,18-tetrabutylporphyrinate ( I ) and its 5,15-diaza ( II ), diphenyl ( III ), and di(4-bromophenyl) ( IV ) derivatives were synthesized by the complex formation reaction of palladium(II) chloride with corresponding tetrapyrrole ligands in dimethylformamide, and their spectral prop…
Production of initial and mechanically alloyed powders of oxide-dispersion-strengthened (ODS) 12Kh13M2FBR (EP-450) reactor stainless steel are considered. Structures of powders and compacted materials have been studied. The rate of thermal creep of the mechanically alloyed EP-450 ODS steel in comparison with the conve…
We present the results of a systematic investigation of the dc magnetization, ac susceptibility, resistivity and thermopower of Pr 2− x Sr x CoO 4 ( x = 1.2, 1.3 and 1.5). The x = 1.2 specimen undergoes a paramagnetic phase above 201.57 K, Griffiths phase between 201.57 and 129.24 K, ferromagnetic cluster-glass phase…
Article Crystal structure of dysprosium meta-oxoborate, β-Dy(BO2)3, via normal-pressure synthesis was published on September 1, 2008 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 223, issue 3).
Here we report the synthesis and superconductivity of (La 1- x Ce x )(O 0.9 F 0.1 )FeAs and (La 1- x Pb x )OFeAs, which were prepared via partially substituting the trivalent La with either Ce in LaO 0.9 F 0.1 FeAs or Pb in LaOFeAs, respectively. Influence of the doping level x on the superconducting transition temper…
Ecdysis-triggering hormone (ETH) is an integration factor in the ecdysis process of most insects, including Bombyx mori (silkworm). To understand the function of the ETH gene in silkworm, we developed an effective approach to knockdown the expression of ETH in vivo based on RNA interference (RNAi) and a binary UAS/GAL…
Electrically conductive adhesive with isotropical electrical conductivity modified with addition of silver nanoparticles has been investigated. The electrical resistance, nonlinearity of a current vs. voltage characteristic and the tensile strength of adhesive joints formed of this adhesive have been measured. The spe…