Materials Literature
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In the system alkali-oxide-transuranium-oxide-oxygen, ternary oxides containing hexavalent transuranium elements were prepared by reactions in the solid state. Depending on reaction conditions, the following compounds were obtained: Na2Np2O7, α-Na2NpO4, Li4XO5(X Np, Pu, Am), α-Na4XO5(X U, Np, Pu, Am), β-Na4XO5(X …
Abstract The possibility is considered that clay minerals can influence the formation of some kinds of dolomite, either by supplying magnesium ions or serving as membranes that control ionic migration.
Expressions may be derived for the thermal expansion coefficient of polycrystalline graphite in terms of the single-crystal coefficients and the preferred orientation of the sample. Thermal expansion and preferred orientation measurements were performed on pyrolytic, molded, hot-worked, extruded-rod, and extruded-tube…
A numerical calculation of the Peierls stress and energy in the Frenkel—Kontorova dislocation model is reported. The calculated stresses are compared with the theoretical predictions of V. L. Indenbom that they decrease exponentially and I. M. Lifshitz that they decrease as the inverse fifth power with dislocation wid…
KOZO HAMAGUCHI, HIROKO SAKAI; Structure of Lysozyme: IX. The Effect of Temperature on the Conformation of Lysozyme*, The Journal of Biochemistry, Volume 57
The area of glass formation in the system GeO 2 ‐P 4 O 10 ‐V 2 O 5 and the properties of the glasses in this area were determined. The glasses displayed electronic conduction at room temperature (25°C). Resistivity ranged from 500 ohm‐cm to 10 9 ohm‐cm at 25°C. Some of the glasses had unusual negative temperature coef…
It is shown that a more natural description of the forces on a dislocation is obtained if in the Peach–Koehler equation all the stresses are replaced by the deviator stresses.
Dislocation loops containing stacking faults have been observed in quenched aluminium using the electron microscope. It is found that lowering the quenching rate relaxes the stringent purity conditions governing the retention of faulted loops, such that a high proportion of the loops in oil-quenched aluminium (99·97 %…
Abstract A stream of atomic oxygen, produced by passing oxygen at low pressure through a radio‐frequency coil, was allowed to impinge on films prepared from several dozen different polymers. The flow of oxygen radicals was regulated so that the reaction temperatures were between 40 and 70°C. The rapid reactions which…
Formation of the Pb(Zr,Ti)O 3 solid solution in the system PbO‐TiO 2 ‐ZrO 2 was studied by chemical analysis and X‐ray powder diffrac‐tometry. Only PbTiO 3 and Pb(Zr,Ti)O 3 were found as reaction products. The following three elementary reactions seemed to be reasonable for the formation of the Pb(Zr,Ti)O 3 phase: PbO…
Growth of the planktonic, euryhaline diatom (Bacillariophyceae) Thalassiosira fluviatilis, both in nature and in culture, is accompanied by the production of a large amount of extracellular "mucilage". This mucilagenous condition is due to the formation of long, narrow fibers, composed of a number of microfibrils, whi…
It is the purpose of this paper to report that all corrosion processes that produce no insoluble end products and evolve hydrogen follow a single kinetic law.
A radial heat flow technique was used to measure the thermal conductivity, k , of polycrystalline UO 2 in the range ‐57° to 1100°C. The technique yielded results with a probable accuracy of ±1.5% and a precision of ±0.1% in the range 50° to 1100°C. Meaningful measurements were limited to 1100°C by Pt‐90 Pt10Rh thermoc…
By more precise variable angle monochromatic fringe observation (VAMFO), it has been found possible to improve the precision of thickness determinations of transparent thin films (800 Å to several microns) on reflective substrates to better than 0.1%, and to extend the determination of the refractive index to films as…
The effect of proximal rigid boundaries on the motion and damage capabilities of spark bubbles is investigated by means of a qualitative photographic study. It is determined that an axially symmetric bubble collapsing nonhemispherically against a solid boundary can form a liquid jet which impinges against the solid bo…
Conventionally, the theory of boundary scattering ignores the dependence of the reflection coefficient (p) on the electron wave vector. An alternative possibility, that the reflection coefficient changes abruptly from 1 to 0 when the change of wave vector on specular reflection exceeds a certain value, is explored her…
The crystal structure of Ga2—xFexO3, with 0.7≤x≤1.4, has been determined at 298°K by x-ray diffraction. Ga2—xFexO3 crystallizes in the orthorhombic system, space group Pc21n, with lattice constants a = 8.7512±0.0008, b = 9.3993±0.0003, c = 5.0806±0.0002 Å and eight formula weights in the unit cell. The complete scatte…
Abstract The effect of cooling, nucleation, and spherulitic growth rates on the properties of polypropylene is discussed briefly. A differential thermal analysis technique is described for evaluating the relative extent of heterogeneous nucleation that occurs in a particular polypropylene composition. The method is ba…
Measurements have been made of the fraction of an electron beam backscattered from thin films of copper and gold at incident energies from 5 to 25 kev. The results from very thin films indicate that approximately 50% of backscattering from a solid target must be due to single scattering. A comparison with existing the…
The electrical conductivity of M 2 O 3 ‐ZrO 2 compositions containing 6 to 24 mole % M 2 O 3 , where M represents La, Sm, Y, Yb, or Sc, was examined. Only Sm 2 O 3 , Y 2 O 3 , and Yb 2 O 3 formed cubic solid solutions with ZrO 2 over most of this substitutional range. Scandia forms a wide cubic solid solution region w…