Materials Literature
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Abstract The penetration of new markets by polyester fibers has emphasized the need for increased stability of the polyester toward a variety of degradative reactions. Extensive studies of the nature of the thermal, hydrolytic, oxidative, and radiation‐induced degradation reactions have been reported. The interpretati…
Abstract A comparison of the kinetic and diffusional models for solid‐gas reactions occurring in a spherical particle is presented. The similarities and differences of the unreacted‐core shrinking model and the homogeneous model are examined in light of the rate‐controlling factors. In view of the similarity of the tw…
The Raman spectrum of single-crystal SrTiO3 has been investigated as a function of temperature down to about 25°K. The lattice dynamics of this crystal have been extensively studied in recent years primarily because of its unusual dielectric and acoustic properties. Both nominally pure and impure samples were examined…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolybdovanadophosphoric acids and their salts. I. Investigation of methods of preparation and characterizationGeorge A. Tsigdinos and Calvin J. HalladaCite this: Inorg. Chem. 1968, 7, 3, 437–441Publication Date (Print):March 1, 1968Publication History Published online1 May 2…
X-ray scattering factors for neutral atoms from He to Lw and for most of the chemically significant ions through Lu3+ have been computed from numerical Hartree–Fock wave functions. The results are given in the form of coefficients for an analytic function.
CONTENTS I. Features of the chemical structure of steroids 155 II. Correlation of the infrared spectra of steroids with their structure 156 III. Use of infrared spectroscopy in steroid chemistry 164
CONTENTS I. Introduction 142 II. Classification of masking processes 143 III. Methods for calculating the efficiency of masking 144 IV. Masking and the selectivity of reactions 148 V. The most common masking agents 149 VI. Characteristic examples of the practical application of masking 153
Probable functions of the baculum are reviewed. Consideration of vectors of resistance of the vaginal orifice and of forces of the baculum reveals possible reasons for the specialization of the bacular tip in some carnivores and rodents. Coefficients of variation of length and some other measurements of some bacula of…
The 7Li NMR spectra from several lithium borate glasses have been examined as a function of temperature and found to narrow abruptly with increasing temperature in the range of temperatures from 250° to 475°K. The observed narrowing is a manifestation of the phenomenon of motional narrowing, and is attributed to diffu…
The crystal structure of β-CU 2 P 2 O 7 has been determined by X-ray methods. The crystals are monoclinic with a = 6.827(8) Å, b = 8.118(10) Å, c = 4.576(6) Å, β = 108.85(10)°, Z = 2, and space group C2/m. This structure is analogous to that of the mineral thortveitite and the high temperature forms of the pyrophospha…
Reflectivity data from single crystals of alkali halides have been obtained in the ultraviolet region of the spectrum where excitonic and low interband transitions occur. Following recent calculations for the band structure of KC1 and KI and basing our analysis on the experimental data, it has been possible to predict…
Experimental evidence is presented to demonstrate the scaling relations of the similarity principle for multipacting as applied to coaxial electrodes with b/a (b and a are the radii of the outer and inner electrodes, respectively) varying between 2.3 and 18.26. The two field configurations considered are: (1) rf volta…
The thickness dependence of the thermal emf of thin-film copper—constantan thermocouples at room temperature and above shows nearly bulklike behavior when the thickness of both elements comprising the thermocouple is greater than ∼1200 Å. The thermal response time of the thermocouples as measured with a pulsed laser b…
This paper examines the temperature dependence predicted by theories of dispersed barrier hardening. Most of interaction potentials employed in the theories are similar. It is not possible to select one of several interaction potentials on the basis of an experimentally obtained stress-temperature relationship. This p…
The scattering of x rays from the free surface of liquid benzene has been analyzed at 25°C. The diffractometer used was specially designed for the study of liquid structure. Intensity and radial distribution functions have been computed for a model structure and compared to those derived from experiment. The model ass…
The magnetic and crystallographic properties of CaZn5-type intermetallic compounds of cobalt and rare-earth elements (including Th) have been investigated. Strong deviations from 1:5 stoichiometry are observed when the rare-earth radius becomes relatively small. Both the saturation magnetizations (4πIs=2360–12 300 G)…
The energy spectra of Auger electrons emitted from many elements and alloys have been observed. Differentiation of the secondary electron-energy distribution by perturbation and synchronous detection techniques, and suppression of the effects of low-energy secondaries, were used to obtain well-defined spectra. The Aug…
Samples of glassy carbon prepared from two different resins and given different heat treatments have been studied with small-angle x-ray scattering to determine pore structure and concentration. The results of the study are described and discussed after an initial section in which the analytical methods used are defin…
The plastic deformation behavior and modes of fracture exhibited by tubular bomb casings are greatly influenced by the stress state imposed by explosive and inertial forces. These forces combine to produce triaxial compression over a varying inner portion of the tube wall. Noting that compressive hoop stresses would e…
Absorption and emission spectra of nine (4d)6 ruthenium(II) complexes dissolved in rigid glasses are reported. Tris(bipyridine), tris(o-phenanthroline), bis(tripyridine), and a series of cis-substituted bis(bipyridine) complexes of ruthenium(II) were synthesized. The cis substituents were cyanide, ethylenediamine, pyr…