Materials Literature
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The development of a low-permittivity pressboard obtained by blending polymethylpentene fiber with cellulose fiber is described. The permittivity is 3.5, which is lower than that of conventional pressboard. With this pressboard, insulating characteristics of intercoil models were investigated under lightning impulse a…
The kinetics of catalysis of a number of new and established heterogeneous O2 catalysts have been studied using CeIV as the oxidant via both the disappearance of the CeIV ions and concomitant appearance of O2. The most active of the catalysts tested utilised a PGM(IV) oxide, usually Ru or Ir, prepared by the Adams met…
Abstract Reversible color development induced by near UV light (photochromism) was observed for some crystalline powder of 1,1′-diaryl-4,4′-bipyridinium bis(p-toluenesulfonate). Redox mechanism by the electron transfer from the sulfonate anion to viologen dication is claimed.
3'-epi-19-Norafraside, a 19-norcardenolide glycoside with dual linkages between a cardenolide and 4, 6-dideoxy-galactos-2-ulose, and 12β-hydroxycoroglausigenin were newly isolated from the stems of Asclepias curassavica, along with known glycosides and free cardenolides. The structures were determined by spectral and…
Abstract The addition reaction of 3,6‐dioxaoctane‐1,8‐dithiol with various diisocyanates, proceeding by addition of 1,4‐diazabicyclo[2.2.2.]octane as basic catalyst, was investigated. That way, NCO‐and SH‐terminated linear thiocarbamate telechelics (containing NHCOS‐groups) were synthesized. The structures were eva…
Strength, toughness and microstructure relations in α, α+β and β titanium alloys are reviewed. Quantitative fracture mechanisms of α+β titanium alloys are described from the view point of strain-controlled ductile fracture models based on fracture mechanics. Various strengthening and toughening processes of titanium a…
A prototype of a high performance robotic actuator, based on shape memory alloys (SMA), is proposed. Starting from detailed knowledge about the material behaviour, the most suitable way of heating and cooling is proposed. Furthermore an 'optimal' shape of the active element is determined and a control method based on…
Magnetic properties of single-crystal ${\mathrm{DyMn}}_{2}$${\mathrm{Ge}}_{2}$ have been studied by magnetization measurement in high fields up to 150 kOe and by neutron diffraction. Four magnetically ordered phases have been observed. In low magnetic fields parallel to the [001] direction, collinear antiferromagnetis…
Direct dissociation and disproportionation of carbon monoxide over partially reduced cerium oxide are demonstrated, even at room temperature, by Fourier-transform IR spectroscopy.
Abstract Thermoset polyurethane (PU) elastomers were prepared using hydroxyl‐terminated polybutadiene (HTPB), toluene diisocyanate (TDI) and hexamethylene diisocyanate (HMDI). The effects of various diamines and diols on the mechanical and thermal properties of polyurethanes are discussed. The average molecular weight…
Abstract
Soymilk, a colloidal dispersion obtained by wet milling of soya bean (Glycine max (L) Merill), was subjected to the foam-mat drying process at 65°C using two foam stabilizers namely, carboxy methyl cellulose (CMC) and glyceryl distearate (GDS) at 5, 10 and 15% levels. While CMC did not produce a stable foam at any of…
A method has been proposed to estimate the grain size, which is defined as the grain size distribution in three dimensions, from the measured distribution of linear intercept length. The method is developed on the assumption that the grain size distribution is log normal in three dimensions. The three-dimensional grai…
Article Identification of Mixed Platinum States and Electronic Effects of Support on Platinum in Supported Catalysts* was published on January 1, 1991 in the journal Zeitschrift für Physikalische Chemie (volume 173, issue 1).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular dynamics of initial events in the thermal degradation of polymersMarc R. Nyden and Donald W. NoidCite this: J. Phys. Chem. 1991, 95, 2, 940–945Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991http…
Polyhydroxycarboxylates (MW: 3,800-14,000) derived from phenolic (PDP) compounds have been found to inhibit the cytopathicity of HIV-1 and HIV-2 in MT-4 cells at concentrations that are not toxic to the host cells. The PDP compounds also inhibited syncytium formation in cocultures of MOLT-4 cells with HIV-1- or HIV-2-…
Alloy 625 exhibits a complex precipitation behavior at elevated temperatures A severe loss of notch impact strength at room temperature after exposure in the temperature range of 600 -800C has been determined. This loss of ductility can be correlated above all to gamma double prime and carbide precipitation. The loss…
Reactions of o-, m- and p-C6H4(CN)2 with [SNS][AsF6] in liquid SO2 produced the AsF6– salts of o-, m- and p-[C6H4([graphic omitted])2]2+ in high yield. The para-phenylene AsF6– salt was readily converted (>75%) into other salts (Cl–, Br–, SbCl6– or S3N3–) by anion metathesis. Reduction of [p-C6H4-([graphic omitted])2]…
The PALLAS (discrete ordinates-integral transport) code was improved to include secondary sources, such as bremsstrahlung and fluorescence, to assure accurate and reliable results. The point buildup factors for high-Z materials were calculated with this code in the energy range of 0.015~15 MeV up to 40 mean free paths…
Abstract The formulae for critical absolute and relative growth velocities which govern the disappearance of faces have been derived and discussed. A face can disappear in the habit only if its velocity is greater than the critical one. Both the fast‐ and the slow‐growing faces can disappear. It was shown that B ORGST…