Materials Literature
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Experiments were conducted on the dynamic adsorption of tritiated water vapor, using a column packed with either silica-gel, activated alumina, or molecular sieve 5A. The column was 4 mm I.D. and 5–30 cm long. The runs were performed at 30°–70°C. Tritiated water vapor (HTO) was loaded into the column with a concentrat…
The unequivocal identification of mineral impurities in talc requires definitive analytical techniques due to the very similar structure of many naturally occurring silicates and the small quantities of associated minerals frequently found. The instrumental methods and techniques extant for this purpose are reviewed.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Effect of Temperature on the Cellulose/Water Interaction from NMR Relaxation TimesMichael F. Froix and Andreas O. GoeddeCite this: Macromolecules 1976, 9, 3, 428–430Publication Date (Print):May 1, 1976Publication History Published online1 May 2002Published inissue 1 May…
We first emphasize the original features of our integral formalism and of its numerical applications. We revue the most important results already published for the visible and the near ultraviolet. Then we report new numerical results for the very far ultraviolet and, taking them into account, we discuss the most effi…
The magnetization and principal magnetic susceptibilities of LuCr${\mathrm{O}}_{3}$ are measured from ambient temperature down to 4.2\ifmmode^\circ\else\textdegree\fi{}K. It is found that LuCr${\mathrm{O}}_{3}$ exhibits a weak ferromagnetic moment along the $a$ crystallographic axis below ${T}_{N}=111$\ifmmode^\circ\e…
Adenosinetriphosphatase (ATPase) [EC 3.6.1,3] activity has been found to exist in most preparations of DNA-dependent RNA polymerase [EC 2.7.7.6] obtained from Escherichia coli by a number of purification procedures so far established. Electrophoretic analysis on polyacrylamide gels demonstrated that ATP hydrolysis and…
Abstract This paper presents basic results obtained in the X‐ray investigation of liquid unbranched alkanes of type C n H 2n+2 and polyethylen (PE) melts of molecular weights from 86 (hexane) to 2.10 6 (PE) in the temperature range from 0to 350°C. The position of the maximum of the X‐ray scattering curve 2θ max , and…
Nuclear magnetic resonances of Y 2 (Fe x Co 1- x ) 17 and Y(Fe y Co 1- y ) 5 are observed at liquid N 2 temperature using the spin echo method. A different Y 2 (Fe x Co 1- x ) 17 NMR behavior from that of Y(Fe y Co 1- y ) 5 is interpreted by the existence of antiferromagnetic exchange interaction of the Fe–Fe pair, wi…
Several polycrystalline ceramics were fractured at room temperature and the fracture-mirror radii were measured. The slopes of curves of fracture stress versus (mirror radius)−1/2 correlate directly with Young's modulus. Comparison of results from strength tests and delayed-fracture tests failed to reveal a loading-ra…
The optical dielectric constant ε∞ of Pb1−xSnxTe has been measured for Sn fractions x of 0.0, 0.24, 0.36, 0.39, and 0.40 in the temperature range 6–120 K and at 300 K. The value of ε∞ increases from 33 for PbTe at 300 K to 60 for Pb0.61Sn0.39Te at 6 K. This maximum value appears to occur at a composition and temperatu…
Using cultured cells of the marine alga, Halicystis parvula, we measured the concentrations of 11 inorganic ions in the vacuolar sap and the electrical potential difference (PD) between the vacuole and the external solution. In normal cells under steady-state conditions a comparison of the electrochemical equilibrium…
The crystal structure of ${(\mathrm{C}{\mathrm{H}}_{3})}_{2}$N${\mathrm{H}}_{2}$Mn${\mathrm{Cl}}_{3}$ consists of linear chains of face-sharing Mn${\mathrm{Cl}}_{6}$ octahedra which are hydrogen bonded together by the dimethylammonium ions. The Mn-Cl distances range from 2.514 to 2.582 \AA{} and the bridging Mn-Cl-Mn…
Cells of a strain of Pseudomonas cepacia were isolated from an oil-in-water emulsion containing methyl and propyl p-hydroxybenzoates (methylparaben and propylparaben) as preservative additives. This strain demonstrated the ability to destroy these additives, to utilize the propyl ester as sole carbon source, and to hy…
The temperature dependence of peak counting rates of gamma - gamma angular correlation curves of positron annihilation has been measured for pure Cu, Cu-3.9at%Si, Cu-7.8at%Si, Cu-4.6at%Ga, Cu-8.3at%Ga, Cu-15.0 at %Ga and Cu-8.0at.%Mn. All the measurements were performed at thermal equilibrium from temperatures above t…
By making use of a cubic anvil press equipped with a rotating-target type X-ray generator and a goniometer, lattice compression in Al, Si and Al–Si alloys was precisely measured up to 90 kbar. The experimental precision was greatly improved by newly-devised treatments such as correctioning for off-centering of a sampl…
Abstract Dynamic mechanical properties and impact strength of a blend of poly(vinyl chloride) with a copolyester thermoplastic elastomer were studied. The microscopic structure of the blend was dependent on the thermal history of the specimen. By an appropriate heat treatment, the blend underwent phase separation with…
The model given in this report and the rotating disk method provide a useful combination in the study of dental enamel and hydroxyapatite dissolution kinetics. The present approach is a significant improvement over earlier studies, and both the ionic activity product that governs the dissolution reaction and the appar…
It is shown that techniques developed by Nye, Kröner, Bilby, Bullough and Smith for continuum distributions of dislocations can be applied to planar periodic distributions of discrete dislocations. The rotation field can be calculated as a Fourier sum and, in some cases, even as a closed expression. The calculation is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared frequency effects of lone pair interactions with antibonding orbitals on adjacent atomsL. J. Bellamy and D. W. MayoCite this: J. Phys. Chem. 1976, 80, 11, 1217–1220Publication Date (Print):May 1, 1976Publication History Published online1 May 2002Published inissue 1…
Proton spin–lattice relaxation times (T1) and second moments (M2), at 14.7 MHz, have been investigated for tetramethylammonium cadmium chloride. Discontinuities in T1 at 104 and 119 K indicate the occurrence of crystallographic transformations. It is proposed that, in the low temperature phase below 104 K, the correla…