Materials Literature
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Abstract Three-dimensional diffraction patterns of monochromatic electromagnetic waves contain moving line singularities where the magnitude of the transverse field is zero, and its direction is therefore indeterminate. They are called disclinations, by analogy with the corresponding linear features in liquid crystals…
Abstract TANTALOY 61 METAL is a tantalum-tungsten alloy of high density. It was developed for use as a spring material or for other elastic parts which must operate under chlorinating or severe acid conditions. Its combination of mechanical and anti-corrosion properties has led to extensive use for chlorinator valve s…
The paper comprises a theoretical and experimental investigation into the impulse breakdown voltage-time characteristics of a spherical- particle-contaminated coaxial-cylinder gap in compressed SF6and SF6-N2mixture. The experimental work was carried out on a 25/70-mm diameter coaxial-cylinder gap with a 3.2-mm spheric…
The description of current-induced failures in thin film metallizations used in microelectronic devices should not be limited to electron wind arguments. Several failure mechanisms such as grain boundary grooving, thermotransport and electrotransport, may contribute to matter transport under conditions normally encoun…
Alternative sandwich-panel decorative films were investigated as replace ments for the polyvinyl fluoride currently used in aircraft interiors. Candidate films were studied for flammability, smoke emission, selected toxic gas emis sion, flame spread, and suitability as a printing surface for the decorative acrylic ink…
Abstract The use of binary systems as accelerators in the vulcanization of rubber has received considerable attention, since many of them in suitable combinations, have been shown to provide efficient vulcanization systems. Dogadkin and co-workers and Skinner and Watson reported mutual activation with a number of popu…
Abstract Es wurde der Einfluß der Temperatur auf die Hydratation des Monocalciumaluminats, CaO · Al 2 O 3 , mittels der Differentialcalorimetrie, der Bestimmung der zeitlichen Änderung der aus 1 H‐NMR‐Messungen zu ermittelnden Spin‐Gitter‐Relaxationszeit T 1 der Protonen sowie durch röntgenographische Charakterisierun…
The potentiostatic scratch method has been systematically applied to rank the pitting corrosion (PC) resistance of commercial and laboratory austenitic, superaustenitic, and extra low interstitial ferritic stainless steels in chloride solutions simulating the aggressivity of the human body and seawater. This technique…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of higher triplet states in the anthracene-sensitized photoisomerization of stilbene and 2,4-hexadieneJack Saltiel, David E. Townsend, and Alan SykesCite this: J. Am. Chem. Soc. 1983, 105, 9, 2530–2538Publication Date (Print):May 1, 1983Publication History Published onl…
The sorption rate of swelling penetrants in glassy polymers has been considered as controlled both by the swelling kinetics and the penetrant diffusion through the swollen layer. The stress exerted on the glassy core at the moving boundary is the driving force for the swelling, and results from an osmotic stress and a…
The effect of microstructure on failure initiation of sodium beta″‐alumina solid electrolytes have been investigated by acoustic emission detection. Mode I failure initiation follows Weibull statistics with a modulus of about 2.5. The observed average critical current densities were 145 and 640 mA/cm −2 for large and…
SUMMARY A high‐resolution electron‐microscopic study of sodium β′″‐alumina, a polytype of the more‐widely‐studied sodium β‐ and β″‐alumina, has been undertaken using the 600 kV instrument at Cambridge University. Images revealed the loss of sodium‐containing planes, which had caused crystals to collapse and shear into…
In a previous paper[8] breakdown strengths of c-C4F8/SF6/CO gas mixtures in various proportions were reported for a 30mm rod-sphere gap under ac and impulse voltages. A mixture of 1% c-C4F8 + 59% SF6 + 40% CO exhibited higher dielectric strength than pure SF6 in the pressure range between 350 and 400 kPa. The present…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPerhydroazulenes. 4. 6-tert-Butyl-4-oxoperhydroazulene systemHerbert O. House, Peter C. Gaa, Joseph H. C. Lee, and Don VanDerveerCite this: J. Org. Chem. 1983, 48, 10, 1670–1678Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Published inissu…
The effects of 60 Co gamma radiation on the strength‐related mechanical properties of a borosilicate glass were examined. Although the glass darkened considerably, only a very slight densification was observed after irradiation to levels of 10 8 rads. The strength distributions were not appreciably changed by the irra…
The magnetic susceptibility χ and the electrical resistivity ρ of CrGe and Cr 11 Ge 8 are investigated at temperatures above 4.2 K. The magnetic susceptibility of CrGe exhibits a cusp at about 45 K and shows the T 2 dependence with positive coefficient at low temperatures. This behavior of CrGe, together with the beha…
Thermal conductivities of silicate and borate glasses were determined at 30°C by steady‐state methods. From the experimental data, factors representing the contribution of individual oxides (on a weight‐percent basis) were calculated by the least‐squares method. The experimental thermal conductivities and those calcul…
The infrared and resonance Raman spectra of the two long-lived forms of triphenylformazan and several of its derivatives have been examined. The spectra of unsymmetrically 15 N-labelled derivatives suggest that two tautomers exist for each of the two forms. This observation is confirmed by the spectra of 1-(p-halophen…
Abstract The reflectance spectra of orthorhombic GeSe crystals are studied in the region 0.5 to 12 eV in polarized light with E ∥ a and E ∥ b at 290 K and a Kramers‐Kronig analysis is performed. The thermoreflectance spectra are investigated in the region 1 to 5 eV for E ∥ a and E ∥ b at 300 and 90 K. The energy band…
Abstract The influence of ammonium polyphosphate (APP) and hexabromocyclododecane (HBCD) as flame retardant (FR) on poly(acrylonitrile) (PAN) has been examined. The APP–HBCD system behaves as an intumescent flame retardant (IFR) formulation, APP being the char‐forming agent and HBCD the blowing agent. A negligible gas…