Materials Literature
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This paper contains an exact solution for the stresses arising in an infinite elastic plate having a symmetrically located spherical cavity and subjected to uniaxial tension. The problem of stress analysis in a plate with a spherical cavity was investigated by several authors. But their solutions were all for the prob…
Abstract Two different techniques are used to establish the strain distributions near the domain walls in ferroelastic-ferro-electric crystals (KDP, GMO, TAN ANE); classical optical techniques can give some results for domain structures not far from the monodomain state; γ-ray diffractometry is useful for dense domain…
A preliminary design study has been conducted for constructing a 200 KeV scanning proton microprobe which utilizes the phenomenon of field ionization in hydrogen gas to create a proton source of extremely small dimensions and high "brightness." Calculations for the focusing action of a non-uniformly graded acceleratin…
We discuss theoretically the analog of the Helfrich-Hurault instability for a smectic cylinder (as opposed to the usual case of a flat slab). The smectic layers are initially in a ideal concentric cylinder conformation. It is then assumed that (using for instance a temperature pulse of adequate sign) the layers are pu…
The hollow glass micro-sphere named “Shirasu-balloons” can be produced from the Shirasu, which is a kind of acidic volcanic ejecta. Shirasu-balloons has fewer partition bubbles and shows different surface state, compared with the “perlite” which can be produced from obsidian and perlite, which are the other kinds of v…
Experimental data on the ordinary and extraordinary Hall effect observed in the 3d ferromagnetic metals iron, nickel and cobalt is reviewed. Emphasis is placed on data and analysis applicable to the high‐field limit obtained at low temperatures and high magnetic fields. Complete data on iron single crystals in the ran…
The development of the organic metallic state is traced from our original synthesis and study of TTF-TCNQ to the new conductor HMTSF-TCNQ, the first organic substance which remains metallic as T → 0.
The temperature dependence of the anisotropy constants of some hexagonal ferrites is analyzed on the basis of the Callen and Callen model applied to the different sublattices whose magnetizations are taken from Mössbauer data. The analysis allows clarification of the role of the different mechanisms which cause the an…
The development of shearing stress after onset of steady shear flow has been measured for concentrated solutions in chlorinated biphenyl of monodisperse polystyrenes (M=2.75×105 and 1.53×106) and their blends. The effect of molecular weight distribution on the transient behavior has been discussed on the basis of expe…
As a part of the study on sintering reactions, the thermal decomposition process of La(OH)3 was investigated by using T.G.A., D.T.A. and X-ray diffraction method. From the results thus obtained, the detailed mechanism of the decomposition was inferred.(1) The thermo-gravimetric curves of specimens were obtained in air…
Isopempto- and isochlorocruoro-porphyrin dimethyl esters have been prepared by application of the MacDonald porphyrin synthesis. The vinyl group was introduced by elimination of hydrogen chloride from chloroethyl side-chains carried through from an intermediate pyrrole, and the formyl group (of isochlorocruoroporphyri…
New SI units for ionizing radiations have been recommended by the internation Commission on Radiation Units and Measurements (ICRU). These are the becquerel (symbol Bq), equal to the second to the power -1, and the gray (symbol Gy), equal to the joule per kilogram. It was recommended that the roentgen be replaced as t…
Hexanedioic acid (Adipic acid) precipitation from aqueous solution at 25 °C was followed thermometrically. The precipitation was preceded by a long induction period, where no precipitate was observed; more than half of the total possible precipitate formed during the following period of the same length. The rate of pr…
An improved method is proposed of determining magnetic anisotropy constants for Alnico monocrystals subjected to the optimal field treatment. The magnetic torque curves are measured for the (001) disk specimen in various intensities of magnetic field, and then they are resolved by a harmonic analysis to obtain the Fou…
Abstract Thermal‐balance and differential‐scanning calorimetric studies of the aluminium dihydrogen phosphate/quartz system are reported. An interaction involving a chemical bond is demonstrated and characterised. A study of the nature of the species is reported and an unusual phosphate formula, Al(HP 2 O 7 )·2.5H 2 O…
Abstract Es wird ein kurzer Überblick über die Grundvorstellungen der Theorie des Parakristalls und ihre Anwendung in der Röntgen‐Feinstrukturanalyse gegeben. Weiterhin werden die Beziehungen erörtert, die zwischen der Theorie des Parakristalls und den Flüssigkeitstheorien von O RNSTEIN , Z ERNIKE und Z ERNIKE , P RIN…
The time needed to reach the glass transition temperature, at a constant cooling rate, with a small enough crystallized fraction (less than 10–4) is used as a criterion for glass-forming ability. In order to compute this cooling time, the rates of nucleation, growth and cooling have been coupled together in a kinetic…
Strain aging in 0·2C–Mn steels is eliminated by the addition of 0·02−0·03% Ti which is approximately the stoichiometric addition for steels containing 0·005−0·006%N. This critical amount of titanium also increases the Lüders strain and decreases the impact transition temperature of these reinforcing steels. It is sugg…
Abstract Condensation polymers were prepared from the pentaerythritol acetal of methyl 9(10)‐formylstearate by reaction with diamines and with ethylene glycol. The glycerol acetal was self‐condensed to a poly(ester‐acetal) and also copolymerized with caprolactam. A novel step growth, addition polymerization was carrie…
Pitting problems have been encountered in titanium tubes in heat exchangers handling hot saturated brines. These pits appear to be of two types. One type results in symmetrical holes about one-fourth inch diameter. These are associated with scratches in which iron is found to have been smeared into the titanium surfac…