Materials Literature
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Attempt has been made to determine the effect of the concentration of the solutions of anionic polysaccharides and cationic oligochitosans (modified or not) on some properties of the systems obtained. They were either binary microspheres: sodium alginate/Ca+2 cation or ternary ones: sodium alginate/Ca+2 cation/oligoch…
This paper presents a wavelet packet transform (WPT) based on-line technique for the protection of three-phase interior permanent magnet (IPM) motor. A wavelet packet transform based algorithm for the protection of an IPM motor is developed, implemented, and tested on-line using the DS1102 digital signal processor boa…
Abstract Microstructure, reacting degree and main properties of synergistically modified unsaturated polyester resin (UPR) with polyester urethane (PU) and organically‐modified montmorillonite (OMT) are studied in this paper by scanning electron microscopy (SEM), X‐ray diffraction (XRD), FT‐IR, contact angle and mecha…
Mechanistic models of pilling are discussed in general terms, and a framework for pilling simulations is thereby created. A fundamental flaw in earlier models of pilling is revealed. A more comprehensive model of fibre diffusion and withdrawal from the fabric is proposed, and this is solved in general terms to find th…
This work presents a thermodynamic model to theoretically predict the component activity in multicomponent liquid alloy based on the Wilson equation and an extended Miedema model. Using only the physical parameters of pure metals, the component activities can be theoretically calculated and the calculation results agr…
The magnetic and crystal structures of the LaCo 0.5 Fe 0.5 O 3 perovskite are investigated. It is established that the unit cell of this compound at room temperature is characterized by rhombohedral distortions. As the temperature decreases, the compound undergoes a structural phase transition from the rhombohedral ph…
Despite the common geographic occurrence of inland (athalassic) saline habitats, their biota has not been extensively studied. Diatoms have been estimated to contribute as much as 25% to the earth's primary production (Werner, 1977). However, in hypersaline systems the proportion of in situ carbon fixation by diatoms…
This study investigated the occurrence of vashegyite from a guano-rich deposit located in the Gaura cu Muscă Cave, Romania. Analytical methods used include optical microscopy, X-ray powder diffraction (XRD), scanning electron-microscopy (SEM), inductively coupled plasma-atomic emission spectrometry (ICP-AES), thermal…
Abstract Self‐consistent band structure and density of states calculations were performed for the pure alumina (corundum phase) and the aluminates α‐Al 2– x T x O 3 where T is a transition metal and stands for Sc, Y, La and Ac with x = 0.5. In this study we have employed the full potential linear augmented plane wave…
Glass samples with nominal compositions SrFe 12 O 19 +(12− n )SrB 2 O 4 +nSrSiO 3 , n =3, 6, 9 were prepared by rapid quenching of the melt. Processes of glass devitrification were studied. The samples were annealed at temperatures of 600–900°C, and the resulting glass–ceramics was characterized by XRD, SEM, EDX, and…
Tin and iron impurity atoms in the structure of crystalline and vitreous alloys Ga1−y Tey (y = 0.6, 0.8) and In1−y Tey (y=0.6) are shown to be stabilized in their normal valence states. It is demonstrated that the electrical inactivity of tin and iron impurity ions is caused by the compensating effect of Ga+ and In+ i…
The ion-oxygen conductivity of apatite-like compounds based on lanthanum silicates and germanates La 10 A 6 O 27 (A = Si, Ge), La 10− x Ca x Si 6 O 27−δ ( x = 0.25, 0.5, 1.0), La 9.75 Ca 0.25 Ge 6 O 27−δ and La 9.33+δ Si 6− x Al x O 26 ( x =0.4, 0.8, 1.5) is studied in the interval of partial oxygen pressures p O 2 ex…
Abstract Novel polyurethane gels have been reported in common solvent like dimethyl formamide (DMF). Polyurethanes have been synthesized from diisocyanates, diols and rigid chain extenders. We have illustrated the influence of chemical structure of the chain extenders on gelation rate, thermal property and morphology…
A topology-symmetry analysis is performed for a number of phosphate, silicate, and germanate (gallate) structures. The fundamental structural unit of these structures is an { M ( T O 4 ) 6 } block consisting of the central octahedron sharing vertices with six tetrahedra. It is shown that, in the germanate, silicate, a…
Manganese-doped cadmium sulfide nanoparticles are synthesized in a flexible polymer matrix (synthetic rubber) by a chemical route. They are bombarded with 80-MeV oxygen ions having electronic energy loss (Se) dominant over nuclear energy loss (Sn) and with fluence variation 1011–1013 ions/cm2. Piling up of nanoparticl…
Zirconolite is a potential matrix for the immobilization of the minor actinides: neptunium, curium, americium, and small quantities of unrecyclable plutonium, produced by the reprocessing of the spent fuel.In order to check the incorporation of actinides into the structure, zirconolite ceramic pellets doped with 10 wt…
Fatigue-free Na 0.5 K 0.5 NbO 3 (NKN) thin films were grown on Pt/Ti/SiO 2 /Si substrates by the radio frequency magnetron sputtering method. The addition of enriched Na 2 CO 3 and K 2 CO 3 into the NKN ceramic target was necessary in order to compensate for a deficiency in the Na and K concentrations in the film. The…
The ternary compounds (RE 3 N)Sn with RE = La, Ce, Pr, Nd, Sm were prepared starting from the elements. The compounds with RE = La, Ce, Pr were obtained as single phase materials according to X-ray powder diffraction patterns, which also indicate the cubic inverse perovskite crystal structure (space group Pm3̄m, La: a…
Gold nanoparticles immobilized on carbon and oxide supports showed catalytic activity in the hydrogenation and allylic isomerization of alkenes and arylalk-1-enes. The catalysts were active only in the case when the average size of metal particles did not exceed 30 nm. Hydrogenation was accompanied by the allylic isom…
Batch culture of Ralstonia eutropha using the recycled gas closed circuit culture system was conducted in order to develop a practical fermentation system for industrial autotrophic culture for poly (hydroxybutrate) production. The gas phase of the culture system consisted of substrate gas so that gases in this cultur…