Materials Literature
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When an amorphous Fe90Nd7B3 alloy subjected to annealing for 60 to 180 s at temperatures between 923 and 1023 K consists of a mixed structure of bcc-Fe, Fe3B, Fe14Nd2B and remaining amorphous phases, the (BH)max and remanence were found to have maximum values of 113 kJ/m3 and 1.17 T, respectively. Their crystallites w…
Statistical data analysis has been recently requisite for partial discharge (PD) study. This has been enabled by the recent development of microprocessors or the downsizing of computers. It is important to pay more attention to profiles of a packet of PD pulses on the voltage phase angle. Statistical parameters such a…
The transmission line modelling method and the Preisach theory are employed to model and simulate the hysteresis effects of magnetic cores. This combined approach provides a useful method, which allows fast and accurate prediction of magnetic core losses, and simple software implementation of the dynamic discrete mode…
The use of high-dielectric films for microwave devices, especially phased-array radar systems, in the tens of GHz regime requires very low-loss (0.01 to 0.1) films. Unfortunately most ferroelectrics have losses that diverge (greater than unity) in this frequency range. We develop in the present study quantitative mode…
Hydroperoxide groups are widely believed to be critical intermediates in the oxidative degradation of many polymers, especially commodity polyolefins [34, 5 1-53]. Trace amounts of hydroperoxides in polyolefins such as polyethylene (PE) may be formed inadvertently during polymerization and processing. It is found that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStrain-Induced Crystallization in Poly[methyl(3,3,3-trifluoropropyl)siloxane] NetworksKevin P. Battjes, Chung-Mien Kuo, Robert L. Miller, and John C. SaamCite this: Macromolecules 1995, 28, 3, 790–792Publication Date (Print):January 1, 1995Publication History Published onlin…
Chopped culms of bamboo grass were treated with saturated steam over a range of temperatures and residence times. The effect of various parameters in the steaming treatment on the recovery yield and solubilization of xylan was investigated. The parameters included steaming temperature, residence time, initial moisture…
The pulsed electroacoustic (PEA) method is widely known to be an excellent method for the measurement of the space charge distribution which accumulates in thick dielectric materials (1-5mm). However, because of its lower resolution in the depth direction, conventional application of this method is less suitable for t…
Rod-like complexes [AuCl(CNC6H4C6H4OCnH2n+1-p)](n= 4, 6, 8, 10, 12) have been prepared by reaction of [AuCl(tht)](tht= tetrahydrothiophene) with the isonitriles CNC6H4C6H4OCnH2n+1-p. Metathetical reactions with KBr or KI afford the corresponding [AuX(CNC6H4C6H4OCnH2n+1-p)](X = Br, I). While the free isonitriles are li…
The use of intravenous contrast media is well established in magnetic resonance (MR) for improved diagnosis. MR differs from other imaging modalities in the complexity of signal and contrast dependence, with the method of measurement having great impact on tissue contrast. Unlike computed tomography, in which contrast…
This paper details postchemical‐mechanical planarization cleanup process development for interlayer dielectric films. The scope of the paper includes defining a base line polish process and developing a post‐CMP cleanup process using 150 mm wafers. The efficiency of the cleaning process was evaluated by the number of…
The reaction between tetrathiafulvalene (TTF) and suitable arenediazonium salts leads to products arising from an ordered sequence of reactions featuring electron transfer, loss of nitrogen, radical cyclisation and nucleophilic substitution. The tetrathiafulvalenium salt 6 is shown to be an intermediate in the reactio…
The present study investigates the mechanics of roll formation between sliding bodies at elevated temperatures and humid conditions. Silicon is used as the model material for reciprocating linear sliding tests. The evolution of tribological rolls initially involves the rapid oxidation of silicon wear debris by water,…
Comprehensive x-ray-diffraction data and structure factor calculations are presented for oriented poly(3-octylthiophene) films intercalated by iodine vapor to ${\mathrm{I}}_{3}^{\mathrm{\ensuremath{-}}}$ concentrations of 0, 4, 14, 26, and 45 mol wt. % per octylthiophene monomer. These data reconfirm previous reports…
[MnOEP][A]{A=[TCNE]˙– and [C4(CN)6]˙–} have been isolated as extended 1D coordination polymers with trans-µ2-[A] bridging ligands with strong {A=[C4(CN)6]˙–} and weak {A =[TCNE]˙–} ferromagnetic coupling as evidenced from the fit of the magnetic susceptibility to the Curie-Weiss law (θ= 5.1 and 67.1 K, respectively);…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel Photosensitive Polyimide Precursor Based on Polyisoimide Using an Amine PhotogeneratorAmane Mochizuki, Tadashi Teranishi, and Mitsuru UedaCite this: Macromolecules 1995, 28, 1, 365–369Publication Date (Print):January 1, 1995Publication History Published online1 May 200…
Two series (4 and 5, each with three members) of a new family of metallomesogens have been synthesized starting from the bisimine ligands 1 and 2 and the dichloroplatinum compound 3. These one-pot reactions of 1 or 2 with 3 leading to 4a and 5a, respectively, give insights into possible self-assembly processes and con…
Six silicas, with different surface areas, pore sizes and pore volumes, have been surface modified with pyridine groups and used to support iron(III) 5, 10, 15, 20-tetra(2,6-dichlorophenyl)porphyrin (FeIIITDCPP) by ligation to the metal ion. Comparison of these materials (SiPy–FeIIITDCPP) as catalysts for the epoxidat…
Abstract The effects of physical aging on the failure behavior of a typical brittle polymer, polystyrene, have been studied. Properties examined were creep rupture lifetimes, fatigue lifetimes, and environmental stress cracking in ethanol. Fractured samples were examined both optically and by scanning electron microsc…
Abstract The precipitation of calcite from a calcium bicarbonate solution, similar in ionic strength to natural hardwaters, was observed in a series of experiments utilizing an automated culture apparatus. Seeded growth experiments, using calcite seed crystals, were performed at a range of phosphate concentrations to…