Materials Literature
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The effects of processing variables on the solid state properties of rigid PVC were studied by evaluating dynamic mechanical and tensile properties for thin film specimens of two different resins. The dynamic measurements were performed over the temperature range −1]60 to 85°C, encompassing both the low temperature β…
The infrared spectra of NH4HS and ND4DS have been recorded from 200 to 4000 cm−1 at liquid nitrogen temperatures, and the Raman spectra of these substances have been recorded from 0 to 4000 cm−1 over the temperature range 83–390°K. No evidence of a second solid phase was obtained. Internal and external fundamentals we…
Carbide-based fuels simulating high burnup were prepared by addition of inactive fission product elements. They contained fission product phases of the UMoC2 and U2RUC2 type, and a rare-earth oxide phase. The thermal conductivity of the material is within the range observed for carbide-based fuels free of fission prod…
Analyses of experimental estimates of the wool growth rate as a function of intake have previously been based on time-independent equations and linear regression with ordinary least squares. Some of these results are reanalysed with the assumption that the sheep is a dynamic system; hence a time-dependent description…
Transient changes in load following a decrease in strain rate have been measured with a fast recording system during tensile tests of copper crystals. Good agreement between the predicted and measured shapes of the transients have been obtained simply by taking into account the elasticity of the testing machine. A met…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization of amorphous germanium sulfide and germanium selenide under pressureMasahiko. Shimada and Frank. DachilleCite this: Inorg. Chem. 1977, 16, 8, 2094–2097Publication Date (Print):August 1, 1977Publication History Published online1 May 2002Published inissue 1 Aug…
When cultivated in a liquid medium with cellulose, Chaetomium thermophile var. dissitum produced extracellular cellulolytic enzymes. By concentration of the culture filtrate, followed by ion‐exchange chromatography on DEAE‐Sephadex A‐50 and gel filtration on Biogel P‐100, three electrophoretically pure components were…
The thermal decomposition reactions of prepared FeOCl and natural marine cast iron corrosion products in inert, oxidizing and reducing atmospheres were determined for temperatures up to 1000°C. The results were used to discuss thermal stabilization treatment of marine iron. Pure dry hydrogen was shown to be the best a…
Abstract The incorporation of a rubber phase in glassy polymers, as is well known in the case of high impact polystyrene, leads‐to an increase in their impact strength. Block polymers offer three principal approaches for obtaining multiphase glassy polymers in which an elastorner phase is present in the matrix of the…
The pressure-temperature phase diagram of (NH 4 ) 3 H(SO 4 ) 2 was studied by means of dielectric and differential thermal analysis measurements in a range of \(p{\lesssim}8.5\) kbar, –100°C \({\lesssim}T{\lesssim}\)150°C. The I-II transition point (140°C at 1 atm) linearly decreases with increasing hydrostatic pressu…
The theory of space-charge-limited current (SCLC) flow in insulators has been extended to include the case of materials with two sets of traps. By using the regional approximation method, two theoretical current-voltage characteristics have been derived for this situation, referring to different starting positions of…
Gradient-index ray-tracing techniques are used to evaluate performance of inhomogeneous optical waveguide lenses. Using the thin-film waveguide parameters including the lens thickness profile, the phase error and diffraction pattern are derived. The procedure is applied to a classical Luneburg index profile for which…
Forty fine-wool Merinos grazed sown pastures and 40 grazed on weedy unimproved areas for 2 years. The sheep were dyebanded at intervals, and the weight of wool lost from the fleece tip was estimated from sequentially harvested sets of staples. Half the sheep in each group were fitted with woven polyethylene coats. In…
Abstract The heat capacities of (NH4)3[FeF6] crystal have been measured from 15 to 350 K with an adiabatic calorimeter. A heat capacity anomaly was observed at 267.02±0.05 K. The enthalpy and entropy changes of the transition are 6490±500 J mol−1 and 24.8±1.9 J K−1 mol−1, respectively. This value of entropy was discus…
Abstract In order to study the influence of chemical modification on properties of polyamides, wholly aromatic polyamides have been synthesized from p ‐phenylenediamine, its 2,5‐dimethyl and 2‐methyl derivatives, m ‐phenylenediamine, its 2‐methyl and 4‐methyl derivatives, and terephthaloyl and isophthaloyl dichlorides…
Oxide films have been formed on nickel by either electropolishing in or anodizing at different potentials and times in p H 2.8 . The 6–8Å film of on electropolished nickel breaks down rapidly on open circuit at p H 2.8 with a poorly defined potential arrest structure. In contrast, several distinct potential arrests ar…
A cellulolytic bacterium, identified as belonging to the genus Cellulomonas, produced two classes of cellulases when grown in the presence of cellulose. One class comprised enzymes which were tightly bound to cellulose, and the other, enzymes which were found free in the culture supernatant fluid. The cellulose-bound…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of hydrogen absorption by lanthanum-nickel (LaNi5)S. Tanaka, J. D. Clewley, and Ted B. FlanaganCite this: J. Phys. Chem. 1977, 81, 17, 1684–1688Publication Date (Print):August 1, 1977Publication History Published online1 May 2002Published inissue 1 August 1977https:…
The chemical constitution of the passive oxide films formed on aluminum in chromate and chromate/chloride solutions under simple immersion (at open‐circuit potential) and under anodic polarization has been investigated by means of x‐ray photoelectron spectroscopy. It has been shown that these films, whose thickness is…
Abstract The complex dielectric constant ϵ of thick Cu and Ag films on fused quartz substrates is determined at 300 and 1.5 K by a modified v. Fragstein‐Kampermann method in the spectral region between 0.41 and 0.71 m̈n. The relaxation frequency of the conduction electrons is determined and the contributions of electr…