Materials Literature
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The possibility that terms other than Fermi contact interaction make significant contributions to nuclear spin-spin coupling with heavy nuclei has stimulated considerable interest in the n.m.r. spectra of compounds containing heteroatoms. In particular, relative signs and magnitudes of J_(XCH) and J_(XCCH) have be en…
Growth of heavily doped germanium and silicon crystals is investigated from the standpoint of constitutional supercooling. When the impurity concentration exceeds a certain value, corrugations appear on the crystal surface. The impurity concentration necessary for the appearance of the corrugation, the doping limit, i…
The Cavitation Damage Number proposed by the author has been modified to incorporate the concept of strain-energy instead of the dynamic yield stress of the material. The correlation between the Cavitation Damage Number and the Number of Cavities has been extended to different materials and different sizes. A third no…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTINTRAMOLECULAR HYDROGEN BONDING IN o-NITROBENZALDEHYDE AND RELATED COMPOUNDSS. PinchasCite this: J. Phys. Chem. 1963, 67, 9, 1862–1865Publication Date (Print):September 1, 1963Publication History Published online1 May 2002Published inissue 1 September 1963https://pubs.acs.or…
Natural graphite single crystals and polycrystals have been deformed at room temperature and optical and electron microscope studies of these have been coupled with x-ray investigations. The appearance and disappearance of x-ray diffraction peaks corresponding to the rhombohedral structure has been investigated. After…
The attenuation of shock waves in 2024 aluminum has been studied experimentally by impacting aluminum flyer plates upon aluminum targets and measuring the target-free surface velocity as a function of target thickness. The results disagree with the predictions of hydrodynamic theory, exhibiting premature attenuation.…
A new species of brackish-water diatom, Cyclotella cryptica, is described on the basis of structural details of the cleaned shells from cells of different sizes grown in culture. This species resembles C. meneghiniana in the light microscope but can be clearly distinguished by electron microscopy.
Summary By measuring the integrated line intensity on a Philips' X-ray diffractometer in place of the peak intensity and by paying due regard to the ease with which aragonite converts to calcite during cleaning and grinding operations, the proportion of calcite and aragonite in a pure calcium carbonate shell can be de…
Abstract A molecular theory is presented in this paper which gives a method of analysis for the mechanical properties of filler-reinforced elastomers, based upon the concept of the internal deformation and the statistical theory of rubberlike elasticity. By using a suitable model and a few new concepts a proper analys…
The transmittance and reflectivity of metal meshes made of brass wire were measured in the far infrared region. The reflectivity of these meshes is very low in the wavelength region up to the wavelength of about 1.3 times the mesh constant, but then increases steeply so that the mesh becomes a nearly perfect reflector…
If an energetic atom, a primary, slows down in a lattice, it has the possibility of traveling long distances without essential interaction along almost force-free channels bordered by close-packed atomic chains. This effect has not been considered until recently, because, for the sake of simplicity, the lattice has be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Protonation of PyrrolesY. Chiang and E. B. WhippleCite this: J. Am. Chem. Soc. 1963, 85, 18, 2763–2767Publication Date (Print):September 1, 1963Publication History Published online1 May 2002Published inissue 1 September 1963https://pubs.acs.org/doi/10.1021/ja00901a020htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRhenium Catalysts. VII. Rhenium(VI) Oxide1H. Smith Broadbent and William J. BartleyCite this: J. Org. Chem. 1963, 28, 9, 2345–2347Publication Date (Print):September 1, 1963Publication History Published online1 May 2002Published inissue 1 September 1963https://pubs.acs.org/do…
The stresses and deflections of thin rectangular beams of arbitrary variable depth, in pure bending, according to the theory of plane stress, are considered. They are obtained in the form of series; the first term of each series is identical with the strength-of-materials solution and the others represent the necessar…
When a steel ball was rolled under load in contact with three similar balls in the presence of a mineral oil containing tritiated water, both tritium and hydrogen were absorbed by the steel surfaces. The amount of absorbed tritium increased with the time of stressing. All the data for the amount of tritium absorbed by…
Abstract Carboxyl groups in elastomer molecules have been shown to contribute to the crosslinking or joining of these molecules through hydrogen bonding, salt formation, reaction with diepoxides or polyepoxides including epoxy resins, reaction with diamines or polyamines, esterification with di- or poly-hydric alcohol…
The Petch equation ([sgrave] = [sgrave]0 + kl −½) is applied rather widely in investigations of the sources of the variation of yield stress [sgrave] with grain diameter l in polycrystalline metals. In general, however, the behaviour of randomly oriented aggregates has been considered, so that [sgrave]0 and k are rega…
Measurements of the electrocaloric effect in crystalline Rochelle salt throughout the ferroelectric range have been made and have been used to determine the Devonshire "dielectric stiffness" coefficient, the ferroelectric Curie temperatures, and the spontaneous polarization close to both Curie temperatures. The result…
The migration of slab, cylindrical, and spherical zones through a block of solid under the influence of a temperature gradient has been analyzed theoretically. The relative rates of migration are in the above order if KS>KL and the reverse order if KS<KL (K=thermal conductivity, S=solid, L=liquid). The m…
The relative intensities of the transitions occurring in the fluorescence spectrum of Eu(C2H5SO4)3·9H2O have been measured at 77° and 4°K. The strengths of both the ``forbidden'' electric dipole transitions and magnetic dipole transitions which were observed are compared to theoretical expressions and the results are…