Materials Literature
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Abstract This study shows that principal component analysis (PCA) in conjunction with iterative target transformation factor analysis (ITTFA) is able to provide an independent estimate of the number, position and, to a certain extent, the shape of spectral components required to describe the Mo 3d envelope as monitore…
The solvation of (2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetraphenylporphyrinato)zinc(II)[Zn(obtpp)], in twelve different solvents results in large red shifts of the B and Q bands of the porphyrin accompanied by enhanced absorbance ratios of the Q bands. These observations are ascribed to the destabilisation of the…
Investigation of the interaction between the 4,4′-bipyridinium(2+) cation (4,4′-H2bipy2+) and the octacyanometalates(IV)[M(CN)8]4–(Mo or W) led to the isolation of [4,4′-H2bipy]2[W(CN8)]·4.5H2O and its isomorphous molybdenum analogue. The spectroscopic properties of both and the X-ray structural characterization of th…
A discrete dynamic model of a magnetic core including hysteresis, eddy current and anomalous losses is proposed. It is suitable for thin laminations and features a simple formulation and fast calculation. The calculations and measurements of an annular ring under different wave forms are presented. The model can be ex…
Abstract Differential scanning calorimetry and X‐ray diffraction experiments on ß‐nucleated poly(propylene) were made on samples crystallized at different temperatures. The crystal perfection was shown to vary with crystallization temperature. The observed multiple peaks could be related to a ß 1 ‐phase with defective…
The surface nature and the composition of AlN powder, as‐received and exposed to binder burnout, were studied using XPS and TEM. The surface of as‐received AlN powder was covered by a thin layer of aluminum oxynitride and oxide mixture. A small portion of residual carbon from binder burnout was bound to oxygen atoms o…
Recent progress in the research and development of electrical insulation for modern electric power systems is reviewed. Cross-linked polyethylene cables, gas-insulated switchgear, composite insulators and oil-immersed transformers are covered. A number of aging processes are presented and analyzed. Typical aging proce…
The hexanuclear complex of calcium oxo ethoxide ethanol solvate, [Ca6O2(OEt)8]·14EtOH 1 has been isolated after the prolonged refluxing of an ethanol solution of calcium ethoxide in the presence of the oxygen in air and studied by X-ray diffraction; the metal-oxygen framework is built of two [Ca4O4] cubes sharing a co…
Abstract The percolation model is used to interpret the brittle‐ductile transition of HDPE/CaCO 3 blends. The percolation threshold (θ sc ) for HDPE/CaCO 3 blends is found to be 0.52, which is equal to π/6. The critical exponent ( g ) is found to be 0.83 for HDPE/CaCO 3 blends. The toughening efficiency of blends whic…
31 P Magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy of a series of Ca phosphate glasses yields the following results and conclusions: (1) The relative concentrations of Q1, Q2, and Q3 P-tetrahedra are consistent with theoretical expectation and previous experimental work, except that near the m…
The crystallization and transformation behavior of the polymorphs of L-histidine (A, B) and the transformation kinetics were investigated in aqueous solutions. Both polymorphs precipitate in almost the same ratio from solutions in a wide concentration range. The ratio of the polymorphs. in the precipitate was scarcely…
For pt.I see ibid., vol.8, no.1, p.246-54. Simulation data for the magnetizing inrush current generated by power transformers, obtained in part one, are used for harmonic analysis. The simulation results show very good agreement with experiment results. The relationship of the harmonics to all parameters is discussed.…
The effects of dissolved oxygen, hydrogen, and hydrogen peroxide on the corrosion (electrochemical) potentials (ECPs) of type 304 SS and alloy 182 in simulated boiling water reactor (BWR) coolant environments under various water chemistry conditions at 288°C are reported. In oxygenated systems, the measured ECP fell w…
The synthesis and solution redox properties of several covalently attached ferrocene and tetrathiafulvalene units are reported, together with the X-ray crystal structure of a 1,1′-bis(1,3-dithiole-2-ylidene)-substituted ferrocene derivative.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel polyoxo molybdenum(V) organophosphonate anion having a sandwich structure: synthesis and crystal structure of [N(C2H5)4]2Na3(H3O)4{Na[Mo6O15(O3PC6H5)(HO3PC6H5)3]2}..apprx.14H2OGuang Cao, Robert C. Haushalter, and Karl G. StrohmaierCite this: Inorg. Chem. 1993, 32, 2,…
A non-fouling (protein-resistant) polymer surface is achieved by the covalent immobilization of polyethylene oxide (PEO) surfactants using an inert gas discharge treatment. Treated surfaces have been characterized using electron spectroscopy for chemical analysis (ESCA), static secondary ion mass spectrometry (SSIMS),…
The compounds [H2im]4[Mo8O26(Him)2]1, [NH2Me2]4[Mo8O26(Him)2]·3H2O 2, [1-Hmim]4[Mo8O26(1-mim)2]·2H2O 3 and [2-Hmim]4[Mo8O26(2-mim)2]·3H2O 4(where Him = imidazole, 1-mim = 1-methylimidazole and 2-mim = 2-methylimidazole) have been synthesized. Compounds 1 and 3 were prepared by the reaction between molybdenum trioxide…
Titanium and titanium passive films have often been taken as standard cases in studying corrosion, passivation, and long term stability of valve metals. Recent work has shown that the corrosion and passivation behaviours and the stability of passive films on titanium depend greatly on the ambient solution. Earlier inv…
The paraelectric and ferroelectric phases of betaine phosphite [BPI: (CH3)3 NCH2COO H3PO3] single crystals have been studied. The structure of BPI was determined at room temperature using x-ray and elastic neutron diffraction. Details of the ferroelectric transition and various low temperature properties were investig…
X-Ray diffraction measurements are reported of ceramic samples of the mixed-oxide system Ce1–xLaxO2–x/2 for 0<x<0.9, where x has been determined by EDXA. The solid-state reaction forms a highly crystalline product at an ageing temperature of 1200 °C. The solubility limit of La in the bulk CeO2 at this temperature has…