Materials Literature
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The dielectric ceramics of BaTi1−3xCuxNb2xO3 (BTCN) with x=0.0, 0.1, 0.2, and 0.3 were prepared by chemical route with the help of soluble tartarate complexes of Ti4+ and Nb5+ ions. It was found that the substitution of Cu2+ and Nb5+ at the Ti site of BTCN ceramics caused a diffused phase transition. Discontinuous gra…
At normal pressure six structural forms of solid selenium are known. The three red monoclinic allotropes (-, -and -) consist of Se 8 rings and differ in the intermolecular packing of the rings in the crystals. The gray metallic trigonal crystalline selenium (t-Se) is formed by helical polymeric chains with the transco…
The phase formation is investigated and the phase diagram of the Ho 2 O 3 -SrAl 2 O 4 system is constructed. A ternary compound, namely, Ho 2 SrAl 2 O 7 , is revealed. It is established that this compound undergoes incongruent melting.
Ruifrancoite, Ca 2 (□,Mn 2+ ) 2 (Fe 3+ ,Mg,Mn 2+ ,Fe 2+ ,Al) 4 Be 4 (PO 4 ) 6 (OH) 4 (OH,H 2 O) 2 ·4H 2 O, monoclinic, is a newly recognized member of the roscherite group. It occurs as a late vug-filling mineral in albite and muscovite, closely associated with cyrilovite and meurigite in a granite pegmatite at the Sa…
In this paper, we introduce two kinds of magnetization type, and investigate the effect of its direction on the iron loss in brushless DC (BLDC) motor using a 2-D time-stepped voltage source finite-element method (FEM). The iron losses consist of hysteresis and eddy current loss is calculated from the time variation o…
This paper focuses on testing silicone rubber (SiR) and ethylene-propylene-diene monomer (EPDM) blends which are applied as outdoor high voltage insulating materials. The study undertakes an investigation of the properties of aged specimens of SiR, EPDM and a blend of SiR/EPDM materials by exposure to ultra-violet rad…
Abstract A summary of the chemistry of the tetranuclear Au(I) amidinate complexes is presented. Tetranuclear Au(I) amidinate clusters are produced by the reaction of the sodium salt of a amidine ligand with the gold precursor Au(THT)Cl in a (1:1) stoichiometry. The structures of the tetranuclear Au 4 [ArNC(H)NAr] 4 ,…
Hollow multilayered polyelectrolyte (PE) fibers were fabricated by the combination of the electrostatic layer-by-layer (LBL) and electrospinning methods. The influence of the deposition conditions on the structure of the obtained hollow multilayered PE fibers was studied systemically. The results showed that the forma…
This paper presents initial partial discharge results for a simple cone-plane gap geometry under applied high voltage when a DC magnetic field is present. Initial phase resolved Phi-q-n results show that the influence of a DC magnetic field as low as 70 mT appears to alter the distribution of the Phi-q-n patterns. Thi…
Pb ( Zr , Ti ) O 3 thin films suffer from progressive degradation of remanent polarization after thermal shocks of step-by-step integration of ferroelectric random access memories. The polarization degradation accelerates with the enhancement of the shocked number per time interval as well as thermal duration at 350°C…
We present a general class of frequency-selective weighting schemes, allowing for a drastic accuracy improvement when embedded in passivity enforcement algorithms for linear lumped macromodels. The proposed technique minimizes the in-band model perturbation while achieving global passivity, even in the difficult case…
A series of poly(p-phenylene-1,3,4-oxadiazoles) (PODs) were synthesised from terephthalic acid (TPA) and hydrazine sulphate in fuming sulphuric acid via a recently developed procedure, namely, one step with three stages. The influence of the reaction temperature and time, and molar ratio of SO3/TPA on the cyclisation…
Major metabolites of dimethylaminoantipyrine have been synthesized using iron ortho-nitrophenylporphyrin chloride as biomimetic catalyst. Reactivity of iron tetrakis-ortho-nitrophenylporphyrin chloride [Fe(TNO2PP)Cl] has been compared with iron tetrakis-pentafluorophenylporphyrin chloride and iron tetrakis-2,6-dichlor…
Schnell wieder in Lösung: Die schnelle und reversible Dispersion von Palladiumnanopartikeln verläuft sichtlich leichter, wenn Sauerstoffgas während des Oxidationsschritts im Redoxzyklus vorhanden ist. Bei 673 K werden die Nanopartikel noch schneller dispergiert als oxidiert, da hierfür zunächst eine signifikante Änder…
This study sought to assess by computer modeling the interactions between dentinal collagen and primer monomer ligands used to promote bonding of restorations to tooth. Modeling was carried out both by direct and indirect methods to probe interaction mechanisms. Ligands studied in this investigation conformed chemical…
A series of alkyl ammonium/montmorillonite (MMT) organoclays were selected and melt blended with polyoxymethylene (POM) to explore the effect of MMT on the thermostability and mechanical properties of POM. The effects of the nature of the surfactants used in MMT modification on the intercalation of POM chains within t…
GLASS CERAMICS. Characterization of the thermal decomposition of polyurethane (PUR) foams was performed by Fourier-transformed infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA). Three main weight loss paths were observed by TGA, the residue being lower than 3 wt.% for 3 different PUR foams analyzed. F…
Oxygen K-edge XANES spectra of crystalline calcium aluminate phases exhibit features that are strongly influenced by orbital mixing between the O 2p antibonding states and Ca and Al orbitals. Specific peaks in the spectra are characteristic of the calcium coordination and can be assigned to Ca in nine-, eight-, seven-…
A series of novel PA 1212/PA 6 composites were synthesized via in-situ polymerization. Incorporating minor PA 1212 (2−12 wt %) into PA 6 matrix led to about 5 times increase of impact resistance of PA6 with its tensile strength maintenance. Inserting PA 1212 macromolecules into PA 6 matrix by this method may interfere…
The recovery of inelastic strains in Ti-Ni alloy samples irradiated in a nuclear reactor under isothermal conditions was studied. Before irradiation, the cylindrical samples were compressed to a residual strain of 3–6% in the martenstici state at room temperature. The samples were irradiated at a temperature of 45°C,…