Materials Literature
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An experimental study of the melt densification of polyethylene powders filled with natural fibres is presented. The aim was to understand the underlying principles applicable to the consolidation of thermoplastic polymer-natural fibre systems processed by rotational moulding. This process has been developed at POLYCO…
Double condensation of 2-acetylpyridine with 1,3-diaminobenzene-4,6-dicarboxaldehyde affords 2,7-bis(2-pyridyl)-1,8-diazaanthracene, which was subsequently oxidized to the corresponding quinone. Electrochemical studies indicate two reversible reduction processes corresponding to semiquinone and hydroquinonate formatio…
We have studied the influence of the methane gas ( CH 4 ) flow rate on the composition and structural and electrical properties of nitrogenated amorphous carbon ( a - C : N ) films grown by surface wave microwave plasma chemical vapor deposition (SWMP-CVD) using Auger electron spectroscopy, X-ray photoelectron spectro…
Magnesium-neodymium based alloys were prepared by induction melting in an alumina crucible under protection of pure argon atmosphere. XRD patterns show that the as-melted Mg-Nd and Mg3NdNi0.1 diffraction peaks can be excellently indexed with DO3 structure (BiF3 type, space group Fm3m). The lattice constant of Mg3Nd ph…
Mixed oxide nanoparticles of 80 mol.-% cerium and 20 mol.-% samarium with rod like morphology were synthesised via a chemical coprecipitation technique. X-ray diffraction (XRD) and high resolution TEM characterisation showed homogeneous distribution of both rare earth metal oxides throughout individual particles.
Abstract Kinetic ordering of the cations in (Sr,Pb)(NO 3 ) 2 and (Ba,Pb)(NO 3 ) 2 solid solutions with anomalous birefringence was studied by means of single crystal X-ray diffraction. The crystal structures of two samples of (Sr 0.62 Pb 0.38 )(NO 3 ) 2 and (Ba 0.20 Pb 0.80 )(NO 3 ) 2 , respectively, taken from the {1…
The particle size dependent thermodynamic functions for the formation of electrons and holes are addressed for semiconductor CdSe nanocrystals (NCs). We recorded the temperature dependent absorbance spectra for a size series of colloidal CdSe NCs in a polymer composite material and analyzed the band-gap behavior. We r…
The dielectric breakdown data of polyimide at liquid nitrogen temperature are investigated. The applicability of the Weibull distribution is discussed. A new distribution function is proposed, and its utility and strength are illustrated distinctly by employing the Monte Carlo method.
In the future, LEO spacecraft will be larger and higher powered. Because of the balance of the leakage currents through the ambient space plasma, their main conductive body will have a higher negative potential without plasma contactor operation. When the spacecraft operates with a higher voltage, more intensive arcin…
Nanoparticles of tin-doped ferrites SnxFe3−xO4(x = 0, 0.1, 0.2, 0.3, 0.4, 1.0) were prepared by the precipitation exchange method. The particles of all specimens are crystalline with mean diameter in the range of 4–8 nm, and the lattice parameters enlarge with increasing tin content. Magnetization and Mössbauer data i…
Crosslinked polyethylene (XLPE) is widely used as the insulator for power cable. Water tree degradation phenomenon is the one of typical problem for the electrical insulation of power cable. In this paper, to confirm whether a signal of a fundamental component and the third harmonics peculiar to the water tree deterio…
Standard enthalpies of formation of quasicrystalline phase and the ternary solid solutions in the Al-Fe-Cu system and the intermetallic compound FeAl were determined by the means of solution calorimetry. The quasicrystalline phase was prepared using two different methods. The first method (I) consisted of ball milling…
A mathematical model of electron-optical processes has been developed and studied. The results of this analysis show that the ion current to a microscopic point emitter can be significantly reduced in planar edge field emission (PEFE) structures. The mechanism of this decrease is related to a special configuration of…
Pitting corrosion was the primary cause of the Alloy 600 (UNS N06600) steam generator tube degradation in a Korean pressurized water reactor (PWR) plant. Pulled tube examinations and remedial measures were carried out to mitigate the pitting. Based on the destructive examinations, the main causes of pitting corrosion…
The effect of a magnetic field on the dielectric properties of Tb 0.95 Bi 0.05 MnO 3+δ single crystals has been analyzed. It has been shown that the state of the crystal for temperatures of 5–440 K is inhomogeneous and restricted domains of polar and spin correlations are exhibited in it. A phase transition in which t…
Visible fiber lasers and amplifiers have potential applications in the fields of optical data storage, spectroscopy, biomedical, and optical local area networks. A spectroscopic analysis has been performed on a borosilicate glass, codoped with Tb<sup>3+</sup> and Yb<sup>3+</sup>, to assess this material as a green las…
Laser absorption spectroscopy of aluminium atoms in pulsed magnetron discharge with pure argon, argon/oxygen, and argon/methane gas mixtures is reported. Time-averaged densities and temperatures of sputtered aluminium atoms were extracted from the absorption signal. The measured Al density depended almost linearly on…
Pure AISI 316L steel is investigated after solution heat treatment (1050 degrees C/H(2)O) and structural sensitization (650 degrees C). Two quite different intergranular corrosion tests are used to determine the degree of structural sensitization due to the precipitation of secondary phases along the grain boundaries…
The formation of nanocrystalline ( d < 100 nm) and submicrocrystalline (100 nm < d < 1000 nm) structures in 09G2S and 10G2FT steels has been studied during cold and warm severe plastic deformation (SPD) by torsion at a hydrostatic pressure and subsequent heating. The steels were subjected to SPD in two initial structu…
New Metallic Glass/Alloy (MEGA)‐rods with a core in bulk metallic glass (zirconium or magnesium based BMG) and a sleeve in conventional light alloys (Al‐5056 and Mg‐AZ31) have been elaborated by co‐extrusion carried out at temperatures corresponding to the supercooled liquid region of the glass. For most glass/alloy c…