Materials Literature
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A processing programme is outlined in which yarn pre-twist, applied air-pressure, and supply-yarn overfeed are systematically varied in the air-jet bulking process to investigate their effects on air-textured nylon 6.6 continuous-filament yarns. Optical magnification of the air-textured yarns enables the average loop…
Summary It is pointed out with the help of the Independent Domain Theory, that a fraction of the pore‐water constituting a volume Δ V is contained in pores not common to both the wetting and drying states and that this volume in a wetting state is contained in pores whose draining radii are greater than those of the p…
Single crystals of α-manganese were grown by the distillation method. These weigh about 300 mg. Crystallographic parameters which define the positions of manganese atoms have been determined by x-ray diffraction. The magnetic structure was determined with better accuracy than that determined by the powder method. It i…
Polyethylene single crystals from dilute solutions usually have a density ρ which is less than that of the ideal crystal lattice (ρc = 1.000 g/cm3). This density defect can be formally assigned to an “amorphous” component (1-α) = (ρc-ρ)/(ρc-ρa) and may be caused by vacancies in the crystal lattice and/or by the surfac…
Abstract The density, congealing point, and hardness were considered in relation to crystallinity, determined by an infra‐red spectrometric method, of a series of waxes which are fractions from crude Fischer–Tropsch wax. Values ranging between 65 and 93, expressed as molecular percentages of crystalline material prese…
Abstract An analog computer‐polymerizer system is described which polts continually the rate of polymerization in percent per hour and the total percent conversion. Computer components and their functions are briefly described and the polymerization vessel with its control instruments are shown. Methods of calibration…
The optimum conditions are discussed for generating channelling patterns (i.e. orientation dependent lines and bands of contrast) in the scanning electron microscope. From considerations of the electron optics it is shown that patterns of highest angular resolution may be obtained by establishing a compromise between…
Cold-rolled-(110)[001]-oriented single crystals of 3% silicon iron containing AlN in solution develop a doublet {111} 〈110〉−oriented primary recrystallization texture consisting of grains with diameter of 0.5 to 1 mm after anneal at 550°C for 40 h followed by anneal at 1200°C. At the first anneal, very fine needle-lik…
This paper invokes the combined action of the crystalline field and exchange in an attempt to explain theoretically why the susceptibility χ of cubic Eu2O3 is found by experimenters to be 30% higher than that for the free Eu3+ ion at temperatures below 50°K. The crystalline field is known approximately from optical st…
A vibrating-coil magnetometer used in conjunction with a helium-gas pressure-generating system has proved to be a versatile new means of studying the effects of hydrostatic pressure on magnetic properties. The sensitivity of this system permits the measurement of paramagnetic susceptibilities on powder samples of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterfacial Phenomena in Macromolecular Systems. II. Relaxation Modulus of Uncrosslinked Silica-Polydimethylsilosane CompositesR. S. Chahal and L. E. St. PierreCite this: Macromolecules 1969, 2, 2, 193–197Publication Date (Print):March 1, 1969Publication History Published on…
A precise X-ray determination of the lattice constants of ruthenium dioxide, RuO2, has been made in the temperature range 30° to 702°C using a Unicam 19 cm high-temperature powder camera. It has been observed that the c parameter decreases with increasing temperature as in the case of FeF2 and CrO2 which also have a r…
The detection and location of discharges in rotating- machine high-voltage windings is useful in directing attention to abnormalities in the insulation structure which can lead to premature failure of the winding. In order to achieve a practically useful test it is necessary to distinguish between conditions involving…
"The Corrosion and Oxidation of Metals: First Supplementary Volume." British Corrosion Journal, 4(2), p. 52
Previous measurements of the birefringence of sapphire and magnesium fluoride have been extended to their respective limits of transparency, revealing anomalous dispersion effects at short wavelengths, which are qualitatively discussed. Possible practical applications to Lyot filters and quarter-wave plates for Lyman-…
SUMMARY Lithification caused by inorganic precipitation of high‐Mg calcite is reported from several localities in the Mediterranean. A micritic calcite cement with 13–15 mol. % MgCO 3 in solid solution lithifies internal sediments and forms open‐space fillings within a sublittoral algal framework down to 20 m, in whic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-diffusion of oxygen in magnetite. Effect of anion vacancy concentration and cation distributionJames E. Castle and P. L. SurmanCite this: J. Phys. Chem. 1969, 73, 3, 632–634Publication Date (Print):March 1, 1969Publication History Published online1 May 2002Published ini…
The field ionization of water is observed utilizing a mass spectrometer. The existence of H4O+ is confirmed. The energy distributions of the ions are investigated. Under certain conditions the energy distributions form two peaks. The appearance potentials of the polymers H3O+·nH2O, n = 0, 1, 2, 3, are determined. A mo…
The superlattice and domain structures exhibited by the ordered compound V6C5 are disrupted by electron microscope beam bombardment. The effect is attributed to the disordering of the carbon sublattice that results from displacement of the carbon atoms by the impinging electrons. Studies have been made of the disorder…
Abstract An x‐ray study of poly( N ‐butyl isocyanate) (PBIC) was undertaken with the aim of providing the structural information required for the calculation of its ultraviolet absorption spectrum. Well defined diffraction patterns are obtained from powder samples and oriented films of the polymer cast from cyclohexan…