Materials Literature
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The EPR silent acetated 54-member crown-shaped polyoxomolybdate Na26[{Na(H2O)2}6( {μ3-OH)4MoV20MoVI 34- O164(μ2-CH3COO)4}] ·≈120H2O (1), constructed from two different but related building blocks in a new mode, is synthesized in high yield by reducing an acidified aqueous solution of Na2MoO4·2H2O and CH3COONa·3H2O.
Conversion coatings for magnesium have traditionally been based on immersion treatment in the solution containing hexavalent chromium compounds. The excellent performance of these coatings as paint bases has been established in a broad range of application. However, the replacable surface treatment has been strongly e…
Supermolecular multilayers with high levels of compositional and structural complexities have been fabricated with an example that involves formation of stable host–guest complexes from bolaamphiphiles and cyclodextrins, followed by sequential build-up of multilayered films by these complexes in combination with anion…
Preparation of SnNx films has been studied by atmospheric pressure chemical vapor deposition using SnCl2 and NH3 as starting materials. The films were deposited onto a quartz substrate at 550–675 °C with growth rates of 0.1–2.5 µm h−1. They showed a typical X-ray diffraction pattern for SnNx with a hexagonal structure…
This paper handles the experience with ultra high frequency (UHF) partial discharge (PD) detection during on-site testing of GIS. A typical PD monitoring system is described. The Cigre sensitivity verification for the UHF method is explained with reference to a test section of a GIS. Examples of PD events from on-site…
A synthetic route to silicon-based composite ceramics that employs organosilicon polymer/metal oxide precursors is described. The precursor materials were obtained by dispersing metal oxides in the poly[(silylene)diacetylenes] 1. Subsequent pyrolysis of the dispersions above 1400 °C under various experimental conditio…
Poly(vinylidene fluoride) (PVDF)/polyamide 12 (PA12) blends showed new peaks in XRD profile with increasing PA12 and the crystallinity of PA12 significantly decreased with the addition of PVDF. PVDF showed three relaxation regions at about −40, 40, and 100°C, respectively, and glass transition temperature (Tg ) of PA1…
The formation of crevice corrosion on type 304L stainless steel when immersed in 0.05 M ferric chloride solution has been used to investigate electrochemical potential noise measurements. The surface activity of the stainless steel was simultaneously studied using a scanning electrode technique to provide corroboratin…
HAZARDOUS WASTE SOURCES AND EFFECTS Hazardous Waste Defined Hazardous Waste Sources Effects of Hazardous Waste CHARACTERIZATION, SAMPLING, AND ANALYSIS Hazardous Waste Characteristics Sampling and Analysis Compatibility RISK MANAGEMENT AND WASTE MANAGEMENT The Hazard Ranking System and the National Priority Lists Risk…
Volume: 76
Delayed fracture in steel has been correlated with concentration of hydrogen to the point of crack initiation. In the present study, effects of plastic deformation and stress gradient on hydrogen diffusion in carbon steels were studied with hydrogen microprint technique (HMT), which can visualize points of hydrogen em…
For more than a century Frustulia saxonica was considered to be an infraspecific variety of F. rhomboides. A search for the type of the basionym, Navicula rhomboides Ehrenberg, revealed that Navicula rhomboides is not a Frustulia. A lectotype is presented for N. rhomboides Ehrenberg. As a consequence twelve new nomenc…
Poly(2-vinyl pyridine) [P2VP] and poly(4-vinyl pyridine) [P4VP]/copper iodide binary mixtures were studied by differential scanning calorimetry (DSC) in order to investigate the phase behavior of the blends at microscopic level. The glass transition temperature (Tg) of the P2VP/copper iodide binary mixtures as compare…
Ru(II) diimine complexes having phosphonic acid substituents adsorb to TiO2 modified ITO electrodes and exhibit electrogenerated chemiluminescence when potentiostated at positive voltages in the presence of oxalate in buffered aqueous solutions.
Doped lanthanum chromites show lattice expansion under high temperature reducing atmospheres. We have proposed a numerical simulation model for analyzing the static and the transient expansion behavior of the doped lanthanum chromites under a stationary oxygen potential gradient or a stepwise change of oxygen potentia…
Modeling the hysteresis behavior of soft magnetic materials based on Preisach theory, requires a Preisach distribution function characterising the material. Although it is possible to obtain all the data for a classical Preisach model from experimental first-order curves, obtaining the Preisach distribution function b…
Thirteen pregnane glycosides were isolated from fresh leaves of Marsdenia tomentosa collected in the Fukuyama district. Of these, six were glycosides previously obtained from the same plant collected in the Fukuoka district and one from another Asclepiadaceous plant. The structures of the six new glycosides were deter…
In this article we report the transesterification of jute with n-Butylacrylate (BA) under appropriate condition using NaOH, Pyridine (Py), and a Pyridine–acetone mixture as a catalyst. The modified vinylog jute was subsequently cured with benzoylperoxide (BPO) in acetone at 50–60°C. The parent and chemically modified…
Pyrolysis gas chromatographic analysis of polyacrylonitrile under an inert atmosphere was made in a temperature region of 500–900°C. It was confirmed that the main degradation products are various kinds of lower nitriles that include CH2CHCN, CH3CN, and HCN. In addition, lower hydrocarbons such as CH4 and C2H4, which…
The transimidization reaction has been successfully utilized to prepare a series of segmented block copolyimides. The synthesis and polymerization of an AX-type amino imide monomer containing the tetrahydro[5]helicene unit were accomplished. The AX-type amino imide monomer is stable during isolation and purification,…