Materials Literature
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Abstract Phonon‐dispersion branches for specific directions of the wavevector, one‐ and two‐phonon densities, and the lattice specific heat C v have been calculated for NaNO 3 using the same lattice dynamical model which was applied recently to trigonal CaCO 3 . The results of the calculations are compared with availa…
The temperature dependence of an order parameter associated with the 110.9-K displacive phase transition in ${\mathrm{K}}_{2}$Re${\mathrm{Cl}}_{6}$ is measured directly in the tetragonal phase using rotation patterns obtained from nuclear Zeeman quadrupole resonance studies on single crystals. The measurements extend…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure-activity relations of fibrinolytic 1,.omega.-diphenyl-1,.omega.-alkanediaminesLeonard J. Fliedner Jr., Melvyn J. Myers, Joseph M. Schor, and Irwin J. PachterCite this: J. Med. Chem. 1973, 16, 7, 749–754Publication Date (Print):July 1, 1973Publication…
Values provided by three different theories of the diffraction by gratings are compared with measurements made at millimetre wavelengths. The results based on the integral equation method of Pavageau and Bousquet give the best agreement with the experimentally-determined shapes of Wood anomalies. The wavelength depend…
This paper, in general terms, treats the morphology of spunbonded nonwovens as related to fabric properties and de scribes some characterization techniques which have been useful in establishing mophological structure. A generalized description of spunbonded processes is given. The dependence of fabric functional prop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRayleigh Scattering from Solutions of Critically Branched PolycondensatesW. Burchard, K. Kajiwara, M. Gordon, J. Kálal, and J. W. KennedyCite this: Macromolecules 1973, 6, 4, 642–649Publication Date (Print):July 1, 1973Publication History Published online1 May 2002Published…
Abstract The weathering of biotite in soils formed in saprolites derived from granite and gneiss was studied. The soils occurred in the Southwestern Upland of Nigeria which is characterized by a humid tropical climate. Vermiculite and montmorillonite are the usual products of biotite weathering in well‐drained tempera…
A combination of Knudsen effusion and mass spectrometric techniques has been employed in studying the gaseous species in thermodynamic equilibrium with condensed CeO2 and with condensed Ce–CeO2 mixtures. A thermodynamic treatment of ion currents yields a value of ΔH°298=135±6 kcal mole−1 for the heat of vaporization o…
The energy analyzer described is of the spherical mirror-spherical grid retarding potential type. It obtains high resolution through a small energy overlap between low energy pass and high energy pass filter functions. The first filter is a spherical electron mirror operating slightly off-axis in a reflection mode. Th…
A biaxial split Hopkinson bar which operates in simultaneous compression and torsion is described. The device utilizes torsional stress waves generated by release of a stored torque and compressive waves generated by mechanical impact of a long rod onto a loading bar. The torque is released by capacitive discharge exp…
The objectives are to examine the variation of these properties with organic content and to compare the behavior of mechanical mixtures with that of natural samples of comparable organic content. The effect of mineralogy is also studied to check its possible influence on mechanical behavior and on the organic content…
Abstract The effect of the addition of certain low molecular weight compounds to highly crosslinked epoxy resins was investigated. The behavior which is known as antiplasticization, such as increases in modulus and yield strength and the elimination of β‐transition, was observed in the highly crosslinked system as wel…
Abstract The crystal structure of Ca 3 (VO 4 ) 2 is rhombohedral with space group R 3 c and unit-cell parameters a = 14.124(1) Å and α = 44.96(2)°, with equivalent hexagonal axis lengths of a = 10.809(1) and c = 38.028(9) Å. The rhombohedral cell contains seven formula units. The structure was refined by full-matrix l…
The current-voltage characteristics in off state and the switching phenomena are investigated. The results can be well explained by a thermal model based on the self joule heating of the sample. The results are summarized as follows: (1) I - V characteristics in off state can be normalized over a wide range of tempera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExternal standards in x-ray photoelectron spectroscopy. Comparison of gold, carbon, and molybdenum trioxideWilliam P. Dianis and Joseph E. LesterCite this: Anal. Chem. 1973, 45, 8, 1416–1420Publication Date (Print):July 1, 1973Publication History Published online1 May 2002Pu…
Abstract A theoretical determination of the elastic modulus, the breaking strength, and breaking strain is made for a single infinitely long molecule of polyethylene (CH 2 ) ∞ . These results are compared with those of a similar calculation on a molecule of polyethylene with a side chain attached. It is found that the…
Abstract It is shown that a strong contrast may arise in dark‐field electron microscope images between two crystal parts related by an inversion operation, as a result of the violation of Friedel's law. Friedel's law is violated only in the diffracted beam and only in cases where a multiple‐beam situation prevails. Mo…
SUMMARY The weak‐beam method of electron microscopy enables the high resolution capabilities of the electron microscope to be used in the study of lattice defects. In this paper, the principles of the method are outlined and the experimental procedures for obtaining weak‐beam images are discussed. The experimental dif…
Nuclear magnetic resonance measurements in the smectic liquid crystalline phases of seven thermotropic compounds are reported. The compounds investigated are: terephthalbis(butylaniline); ethyl(methoxybenzylidene)amino] cinnamate; diheptyloxyazoxybenzene; octyloxybenzoic acid; dipentylazoxycinnamate; diethylazoxycinna…
The use of benzotriazole as a corrosion inhibitor is briefly reviewed and the theory of its mode of protection for copper in aqueous conditions is considered. The solubility has been found to increase with temperature, and the addition of benzotriazole decreased the pH and increased the conductivity of distilled water…