Materials Literature
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The magnetic domain structures formed at grain boundaries in recrystallized iron foils have been analyzed using Lorentz electron microscopy. Five basic types of domain structures have been observed at grain boundaries in iron: (1) Domain walls which penetrate through the boundary indicating ``no interaction,'' (2) dou…
Many kinds of partial discharge detectors are available, and many kinds of windings are adopted for EHV transformers, where propagation of partial discharge pulses is characterized mainly by series capacitance. The acoustic method is predominantly used for partial discharge location, because of the present scarcity of…
Abstract Studies were carried out on decomposition of hydrogen peroxide by ferrous and ferric ions adsorbed on cellulosic materials (SP, SCP), scission of the cellulose chain and formation of grafts by graft copolymerization. As a result, it was found that the activity of ferrous ion is always higher than that of ferr…
Cutting tools of sufficient strength against failure by brittle fracture or loss of “form stability” through rise of interface temperatures, still continue to fail by a process of “wear,” which is loss of cutting tool material through gradual interaction between the work and the tool material. Such wear can take place…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum yields for the sensitized photoisomerization of cis- and trans-stilbeneHowell A. Hammond, D. E. DeMeyer, and Jack L. R. WilliamsCite this: J. Am. Chem. Soc. 1969, 91, 18, 5180–5181Publication Date (Print):August 1, 1969Publication History Published online1 May 2002Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of nitrenium ions. IX. Discrete existence of singlet and triplet nitrenium ionsPaul G. Gassman and Richard L. CrybergCite this: J. Am. Chem. Soc. 1969, 91, 18, 5176–5177Publication Date (Print):August 1, 1969Publication History Published online1 May 2002Published i…
Electron attachment to N2O has been studied with the swarm method in mixtures with argon and nitrogen, and the measured absolute attachment rates have been combined with beam data on the production of O− from N2O. The cross section for the production of O− from N2O at 373°K has a peak value of 8.3 × 10−18 cm2 at 2.3 e…
Deformation twinning can be inhibited in a Mg-5·1 wt. % Zn alloy by the presence of effective precipitates. This is true even in single crystals favourably oriented for twinning. This resistance to twinning precludes those premature fractures which frequently nucleate at twins. At 4·2°k twinning is highly favoured but…
Results of steam oxidation measurements of UO 2 cylinders from 885° to 1835°C may be expressed by the equations: image for the parabolic rate of oxidation and image for the chemical oxygen diffusion coefficient. K p and D c , obtained from thermobalance measurements to 1500° C and from pre‐ and post‐test weights for t…
An extensive study has been made on the growth and characterization of single-crystal magnesium aluminate spinel. This material has received attention as a superior substrate for epitaxial silicon-integrated electronic devices. Large spinel single crystals within the compositional range MgO:Al2O3–MgO:3Al2O3, have been…
A new method is described for examining the deformation dynamics of metals at elevated temperatures. Tensile loads are applied to a specimen using a closed loop electrohydraulic servosystem. An optical furnace and proportional controller are used for temperature control, and a linear variable differential transformer…
Abstract The action of metal halides on polyamide (nylon 6) and secondary amide model compounds has been investigated, using infrared and NMR techniques. Metal halides, which are active stress cracking agents for polyamides, induce characteristic changes in the spectra of both nylon 6 and the model compounds. Two type…
Abstract The heats of formation of solid copper‐nickel alloys have been determined at 500 °C employing an adiabatic high‐temperature calorimeter. The heat capacities of a 70 at. % Ni alloy between 500 and 1000 °C have also been measured. Using all the thermodynamic information available, the heats and entropies of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of thermal effects observed by differential thermal analysis. Theory and its application to influence of sample parameters on a typical DTA curveR. Melling, F. W. Wilburn, and R. M. McIntoshCite this: Anal. Chem. 1969, 41, 10, 1275–1286Publication Date (Print):August 1…
The fracture of fully dense, polycrystalline MgO with grain sizes 10 to 500μm, has been studied. Specimens had chemically polished, machined or annealed surfaces. Fracture in chemically polished specimens is initiated by plastic flow, whilst that in machined specimens occurs by the extension of the flaws produced by m…
This paper describes optical properties of thin electroformed metallic meshes in detail. Since the transmittance shows the bandpass character around the wavelength near the grid constant, metal mesh can be used as a bandpass filter. The reflectance is high in the wavelength region longer than three times the grid cons…
The infrared spectra (4000–650 cm−1) of a series of polyurethane elastomers synthesized from polytetrahydrofuran, diphenylmethane-4,4′-diisocyanate, and ethylenediamine were examined. By comparing the spectra with those of the constituent polytetrahydrofuran and of the model compounds for the hard segments of the elas…
Abstract The nucleation, growth and dissolution characteristics of potassium sulphate have been studied in a laboratory scale fluidized bed crystallizer under carefully controlled conditions of temperature, supersaturation and solution velocity. Aqueous solutions of potassium sulphate can withstand high degrees of sup…
This review emphasizes the fundamental physical principles which describe the growth and decay of the members of a series of radioactive substances. The mathematical procedures are held to the minimum essentials. Graphs and tables are provided for the illustrative case of the “daughter products” of radon (RaA, RaB, Ra…
Abstract Mechanical relaxation has been studied at 0.67 cps in linear polyethylene (LPE) and polytetrafluoroethylene (PTFE) between −190 and −20°C. Specimens were prepared by use of various thermal treatments to produce in LPE a range of crystalline fractions from 0.690 to 0.825 and in PTFE from 0.615 to 0.870. An emp…