Materials Literature
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plots, is 203 K for the quenched glass and 198 K for the annealed glass. For the glasses the heat capacity values from this research are about 1 percent higher than that reported in 1935 for natural rubber hydrocarbon. For the liquid the result from this research agrees better (within 1 percent) with recently (1967) p…
Abstract The stress‐cracking of polycarbonate by a gaseous or liquid agent results from the diffusion of this agent into the polymer. The low molecular weight polymer fractions and the chain ends within the bulk of the polymer become more ordered during the diffusion and swelling process by their partial solubility in…
It is the purpose of this paper to reexamine the interrelation between the two procedures and to ascertain relation between the two procedures and to ascertain their standing as approximate methods in chemical kinetics. The simple analysis given in this article may serve to correct some misconceptions about these appr…
Abstract Soil density and water content can be determined concurrently by measuring the attenuation of two different gamma energies. A dual source containing 241 Am and 137 Cs was shown to be suitable for these measurements. Multichannel pulse‐height analyzers were evaluated to determine their accuracy under experimen…
Magnetic measurements under hydrostatic pressure up to 8 kbar were made on f.c.c. Fe 65 (Ni 1- x Mn x ) 35 alloys in magnetic fields up to 12 kOe and at temperatures down to 4.2°K. The results indicate that in the ferromagnetic alloys ( x <0.3) the spontaneous magnetization and the Curie temperature decrease appreciab…
The determination of mesomorphic behavior was extended to cover the first sixteen members of the cholesteryl w-phenylakanoates. Microscopy and scanning calorimetry were used to identify the mesophases and to measure transition temperatures and associated latent heats. The clearing temperatures fall on two distinct cur…
Summary Soil samples were investigated from three different climatic regions of Japan. The soil profiles were well drained and consisted of a number of buried soils. Organic matter and free iron oxides were removed from the samples which were then fractionated. Laminar opaline silica particles occurring in the 0.2 to…
The two species of Eurycercus are largely allopatric in the Northern Hemisphere, glacialis tending to be peripheral in distribution in the far north, occurring only as far south as 51‐52° N in the outer Aleutians, Labrador, and the northern Kuriles. There are vigorous disjunct populations of unknown history in oligotr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of the urea-guanidinium class of protein denaturants on water structure: heats of solution and proton chemical shift studiesJagdish C. Ahluwalia, Sankaran. Subramanian, T. S. Sarma, and D. BalasubramanianCite this: J. Phys. Chem. 1971, 75, 6, 815–820Publication Date…
The infrared spectrum between 4000 and 200 cm−1 of polycrystalline D2O2 at − 190°C corresponds to that of H2O2 indicating that the crystal structure and spiral chain coupling of excitons for each of the six normal modes are the same in D2O2 as in H2O2. At temperatures near − 100°C the crystal spectra of both H2O2 and…
Summary The main methods in use in laboratories for the microbiological assessment of surfaces are examined, viz. (1) the swab‐rinse, (2) the rinse, (3) the agar contact, and (4) the direct surface agar plating. The advantages and disadvantages of these are discussed and their suitability for particular purposes in th…
Summary The crystal structure of kilchoanite, Ca 6 (SiO 4 )(Si 3 O 10 ), has been determined from three- dimensional X-ray methods ( r = 0·089 on 348 independent reflections). It is closely related to that of γ -Ca 2 SiO 4 , which is olivine-like. In kilchoanite, slabs of γ -Ca 2 SiO 4 structure alternate with ones co…
The susceptibility of high purity Fe-Cr alloys containing 17 to 26% Cr and 0 to 1% Mo has been determined by the Huey test after subjecting the alloys to various heat treatments. The alloys are highly resistant to intergranular corrosion when 0.15 cm thick specimens are water quenched from temperatures between 954 C (…
Abstract The dislocation behaviour in deformed copper single crystals was previously shown to correspond to a lower local flow stress in the surface region than in the interior and the primary glide plane was found to undergo a characteristic bending in the surface region, reflecting a local excess density of unpaired…
In this paper we compute the change in the energy of a uniformly magnetized uniaxial platelet produced by the introduction of a cylindrical domain. Differentiation of the energy expression yields the translational force produced by gradients in plate thickness, material composition, or temperature. The force expressio…
A 46‐in core from the lacsutrine sediments beneath Mexico City was analyzed to establish a stratigraphic sequence of diatom assemblages for use in interpreting the climatic and limnologic history of ancient Lake Texcoco. Diatoms were found in nearly every 20‐cm sample interval, and several major zones were established…
Abstract An idealized model for flexible foam in tension is developed. The model includes large deformations and cell structure orientation before and after deformation. It is predicted that two quantities affect the initial modulus of an unoriented foam: the density and a cell structure parameter. Data for latex foam…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of ruthenium nitrosyl complexes containing 2,2'-bipyridine and 1,10-phenanthrolineThomas J. Meyer and John B. GodwinCite this: Inorg. Chem. 1971, 10, 3, 471–474Publication Date (Print):March 1, 1971Publication History Published online1 May 2002Published inissue 1…
The nonlinear quasi-Poisson equation that describes static magnetic fields in saturable iron is solved approximately by minimizing the corresponding nonlinear energy functional. The minimization is performed by means of the method of finite elements, using firstorder elements and a quadratically convergent iterative s…
When a Cu surface is sputtered by ion bombardment under the condition that Mo atoms arrive at the Cu surface during sputtering an unexpected phenomenon can arise: The surface of the Cu target becomes covered with microscopic cones. The cone density increases with increasing flux density of arriving Mo atoms. When the…