Materials Literature
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Abstract A group‐theoretical classification is made of the α‐O 2 states. It is found that the bimolecular absorption lines must be polarized. It is shown that the bimolecular absorption lines split into doublets by taking into account the collective nature of excited crystal states. The electron‐vibrational structure…
Expressions are derived for determining theoretically the number of filaments accommodatable in successive con centric rings in a multifilament yarn cross section as a function of yam twist and filament diameter. Increasing filament ellipticity with increasing twist is considered. Numerical values are tabulated for se…
Abstract Atactic polypropylene was oxidized in solution with radical initiator in the absence and presence of metal catalyst to considerably high conversion over the temperature range of 70° to 125°C, and oxidation products and the change in molecular weight distribution were measured. The unoxidized polypropylene had…
The moniliform macronucleus of Stentor coeruleus coalesces and renodulates during division, reorganization and regeneration. These nuclear events are spatially and temporally synchronized with oral primordium development occurring at stages six and seven of membranellar morphogenesis. Coalesced, elongating and early r…
The effect of high electric currents on the stability and dynamics of a circular rod is investigated. A uniform current distribution in the undeformed rod is assumed. The perturbed magnetic field due to bending deformation is shown to set up a system of destabilizing forces. For long wavelength vibrations, a frequency…
The morphology of anodic aluminum oxide films formed in neutral aqueous 3% ammonium tartrate was investigated using transmission and replica electron microscopy and transmission stereoscopy. After an initiation period of approximately 90 min, corresponding to the appearance of a minimum in the potentiostatic anodic cu…
Ultrasonic techniques are useful for the detection and location of partial discharge or corona sources associated with HV power apparatus, particularly oil-filled power transformers. Measurements are commonly made using narrow-band transducers operating in the frequency range from ~20kHz to ~300 kHz, and occasionally…
Abstract Theoretical calculations based on a mathematical model of cellulose acetate dry spinning were compared with experimental data. Both experiment and theory indicate that the velocity in the spin line becomes essentially constant and equal to the take‐up speed at relatively short distances from the jet. Spin lin…
Tissues fixed in osmium tetroxide or in combined osmium and glutaraldehyde (Hinde), embedded in Spurr's medium, cut at 0-5-I mum and mounted in Farrants' gum medium containing ethyl gallate, show good staining of lipid-contaning structures (droplets of triglyceride, membranes, mitochondria, etc.) in the light microsco…
Article A Coupling between Charge Transfer and Mass Transport Leading to Multi-Steady-States. Application to Localized Corrosion was published on December 1, 1975 in the journal Zeitschrift für Physikalische Chemie (volume 98, issue 1-6).
The results of an extensive investigation of the optical response of thirteen common optical materials to 2.5-MeV electron irradiation is reported. Radiation-induced absorption and absolute radioluminescence yields were measured in the wavelength range 0.14 to 0.9 μm for dose rates between 5 × 102 and 5 × 105 rad/sec…
Tensile experiments on polystyrene (PS) in various pressure-transmitting fluids were performed up to 4.0 kbar to study the effects of test media on the mechanical behavior of amorphous polymers under pressure. The fracture stress of PS in silicon oil environment was found to depend strongly on the viscosity of oil and…
(1975). THE STRUCTURES AND PROPERTIES OF FIBRES. Textile Progress: Vol. 7, No. 4, pp. 1-74.
The polarized Raman spectra of divalent cobalt ions at concentrations ranging from 2.5 to 10 wt% in cadmium chloride, cadmium bromide, manganese chloride, and cobalt chloride from 15 to 300\ifmmode^\circ\else\textdegree\fi{}K are reported. All five electronic transitions between the spin-orbit and trigonal crystal-fie…
A technique based on potentiokinetic anodic polarization in fused Na2SO4 has been developed for the purpose of estimating the hot corrosion resistance of Ni- and Co-base superalloys. Because it is relatively fast, this technique has been used to preliminarily identify promising candidate alloys, which may then be furt…
Abstract The known method of surface treatment of poly(tetrafluoroethylene) (Teflon) by alkali metals was studied quantitatively. It was shown that the reaction proceeds by an electrochemical mechanism in solid phase. The alkali metal acts as anode and Teflon as a cathodic active material of a typical galvanic corrosi…
Abstract. According to well‐known formulae for the mechanics of flexure stresses, the force required to snap a test specimen of uniform rectangular cross‐section is inversely proportional to its length and directly proportional to the width and the square of the thickness. For a specimen of circular cross‐section, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic spectral study of some iron(II) magnetic isomers in solution and a spectral-structural correlation with their nickel(II) analogsLon J. Wilson, Danae. Georges, and Mitchell A. HoseltonCite this: Inorg. Chem. 1975, 14, 12, 2968–2975Publication Date (Print):December…
Abstract In the initial stage of the development of transcrystallinity, nuclei appear sporadically on the substrate. The growth rate and melting temperature of the transcrystalline region are found to be the same as those of spherulites nucleated in the bulk of the polymer. Nucleation densities n s at the interface, a…
Abstract The dynamic mechanical properties of thermoplastic urethane elastomers have been compared for materials based on different diisocyanate structures, either 4,4′‐diphenylmethane diisocyanate (MDI) or an isomeric ratio of tolylene diisocyanate (TDI). Two comparable series of polymers were prepared with a polycap…