Materials Literature
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The expression u=cr/r3, (where c is a constant) sometimes assumed for the displacement around a point imperfection (interstitial or substitutional impurity, lattice vacancy) gives a nonzero stress at the surface of the solid. The additional ``image displacement'' necessary to insure that this stress vanishes is usuall…
Abstract An electrical capacitance method of estimating the water‐uptake of paint films on metal immersed in sea‐water has given, for many paint formulations, values agreeing with those obtained by a gravimetric method. For a few paints, however, pronounced disagreement was shown between values obtained by the two met…
Abstract Es wird der Stand der technologischen Entwicklung der Silicone in Deutschland gezeigt und auf sich abzeichnende Entwicklungen hingewiesen. Auf manchen Gebieten bilden Kieselsäureester und Polykieselsäureester eine interessante Ergänzung des technologischen Bildes der auf Polysiloxan‐Verknüpfungen aufgebauten…
Abstract Cylindrical test samples were compressed statically and dynamically at temperatures ranging from +100 to -195°C and the yield stress, form of yield and surface markings observed. A Hopkinson bar and throw -off rod and electric resistance strain gauges were used for stress determinations under dynamic loads. T…
The influence of additions of 30 and 40 percent of nickel on thermal expansion in the range from 10° to 50°, rigidity modulus at 20° and its temperature coefficient in the range from 20° to 50°, of alloys of cobalt, iron and chromium has been determined. The relations between those properties of nickel-added alloys an…
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E. A. Braude, J. S. Fawcett and A. A. Webb, J. Chem. Soc., 1954, 1049 DOI: 10.1039/JR9540001049
SynopsisThe results are presented of a quantitative study of the phosphoric acid anodizing of high purity aluminium. The effects of electrolyte concentration, temperature, anodizing time, current density and air agitation on the coating weight, metal loss, coating ratio and density of the anodic coating were investiga…
S. J. Gregg and R. K. Packer, J. Chem. Soc., 1954, 3887 DOI: 10.1039/JR9540003887
In order to explain the origin of the uniaxial ferromagnetic anisotropy induced by cold work or by magnetic annealing in cubic solid solutions, the anisotropy energy caused by an anisotropic distribution of solute atoms produced by cold work or magnetic annealing has been calculated using the same model as in Van Vlec…
Abstract New fiber‐forming polyamides containing heterocyclic groups were prepared form furan 2,5‐dipropionic acid and the corresponding tetrahydrofuran compound which were found to be prepared easily from furfural and levulinic acid. For example, poly‐decamethylenetetrahydrofuran 2,5‐dipropionamide (intrinsic viscosi…
Article The Crystal Structure of Stromeyerite, AgCuS: A Possible Defect Structure was published on December 1, 1954 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 106, issue 1-6).
S. M. Nelson and R. C. Pink, J. Chem. Soc., 1954, 4412 DOI: 10.1039/JR9540004412
A quantitative measurement of the current-density distribution over the surface of monocrystalline tungsten field emitters is obtained by densitometric analysis of calibrated photographic negatives of emission patterns observed with a modified Mueller projection tube. Analysis of distributions thus obtained permits an…
Lanthanum oxychloride can be activated to show strong fluorescence under excitation by cathode rays. Bismuth as an activator gives a blue emission extending into the ultraviolet with the peak at 3580 Å; antimony a greenish white with the peak at 4960 Å, and samarium a reddish orange emission composed of a series of li…
The oxide layer, giving the so‐called electron diffraction pattern and formed by heating copper in air at 600°C, has been examined by high‐resolution electron diffraction and electron microscopy. It is shown that the intensity anomalies which differentiate the pattern from the normal pattern are not due to impurities…
The rate of reaction of nitrogen with high‐purity zirconium was determined for the temperature range of 975° to 1640°C at 1 atm pressure. The reaction followed a parabolic law and the parabolic rate constant in (ml/cm 2 ) 2 /sec was calculated to be where 48,000 ± 1500 cal/mole is the activation energy for the reactio…
Aiming to obtain an interpretation of the cause for variance in behaviours between fish skin and terrestial animal hide, the relation between hydroxyproline content in the collagen and shrinkage temperatur (Ts) of different animal skins was determined. As a result, it has proved that there was a direct proportion betw…
J. M. Skinner, G. M. D. Stewart and J. C. Speakman, J. Chem. Soc., 1954, 180 DOI: 10.1039/JR9540000180
Les charges négatives d'un minéral argileux ne peuvent être neutralisées localement que par des cations monovalents. La saturation du minéral par des cations bi ou polyvalents crée nécessairement des défauts de neutralisation locale. On peut relier à cette circonstance la grande stabilité des états solvatés d'une argi…