Materials Literature
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The superexchange interaction energy for an ${\mathrm{Fe}}^{3+}$-${\mathrm{O}}^{2\ensuremath{-}}$-${\mathrm{Fe}}^{3+}$ linkage is considered for seven oxides in which ${\mathrm{Fe}}^{3+}$ is the only magnetic ion present, and for magnetite. The superexchange energy may be estimated from the value of $\frac{{T}_{C}}{n}…
The relations between corrosion rates and different forms of sulfide corrosion product are defined by the application of standard and novel x-ray diffraction studies of the corrosion products. Preliminary studies showed that in aqueous-H2S environments, different sulfides affect the corrosion rate of steel in various…
A general Hamiltonian formalism is developed to treat from first principles the motion of electrons in solids, including their mutual Coulomb interaction. By a series of canonical transformations it is shown that under suitable circumstances (which obtain in nearly all solids) plasmons (a quantized collective plasma o…
Abstract Differential dissolution in NaOH solution was investigated as a means of purification of clay. It was discovered that a large quantity of allophane and free alumina and silica were dissolved from clay preparations in 0.5 N NaOH solution by boiling for as little as 2.5 min, provided the ratio of clay weight to…
Integro-differential equations are obtained, which describe the variation of molecular weight distributions in a polymer substance caused by irradiation. The solutions of these equations give the gel point and the average molecular weights. In the case of cross-linking without cyclization, the results agree with those…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared Absorption Spectra of Inorganic Coördination Complexes. XIV. Infrared Studies of Some Metal Thiourea Complexes1aA. Yamaguchi, R. B. Penland, S. Mizushima, T. J. Lane, Columba Curran, and J. V. QuaglianoCite this: J. Am. Chem. Soc. 1958, 80, 3, 527–529Publication Dat…
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A series of experiments using paramagnetic resonance at microwave frequencies and in the 1-4\ifmmode^\circ\else\textdegree\fi{}K temperature range on ${\mathrm{Gd}}_{2}$${\mathrm{Mg}}_{3}$${({\mathrm{NO}}_{3})}_{12}$\ifmmode\cdot\else\textperiodcentered\fi{}24${\mathrm{H}}_{2}$O, ${\mathrm{K}}_{3}$Cr${(\mathrm{CN})}_{…
Tight-binding calculations, using a two-dimensional model of the graphite lattice, lead to a point of contact of valence and conduction bands at the corner of the reduced Brillouin zone. A perturbation calculation which starts with wave functions of the two-dimensional lattice and is applied to the three-dimensional l…
研究目的混打綿工程における各機台の開綿程度を定量的に測定するのが目的である開綿には綿塊 (以下タフトと記す) の分割と開舒の両作用がある.タフトの分割は各機台で生じたタフトの平均重量から求め, タフトの開舒についてはタフトの見掛けの比積の値から開綿度を定量的に考えることにした.各機台より採取したタフトの重量と見掛けの体積から見掛けの比積を求め, これの大小をもって開綿度の大小をあらわすことにした.別にタフトの見掛けの体積を測定するのに光線利用の簡単な方法を用い, それによる結果を本実験の結果と比較検討した.研究結果(1) 全体についてはH.B. B., P. O., C. O., H. F. およびF. S. の順序で開綿度は上昇…
In this article the authors seek to compute the percentage of comber waste, to make some modifications or improvements in the constitutent parts of the combers now in use, and to find a guide to further study on the subject. As regards combing action in a cotton comber, we have made some theoretical approaches from th…
(1) The stiffness of textile fabrics depends upon its bending directions, and in general the stiffness in bias directions is relatively small.(2) In so far as the bending is concerned, the fabrics are like 2-plywood but when woven into typical ribs in one direction they become like in mono-plywood.(3) The stiffness in…
Abstract Type species for the trilobite genus Pseudocryphaeus and the subgenus Asteropyge (Metacanthina), proposed and briefly described in 1953, are here described in detail, as well as several related forms, including the new subspecies A. (M.) oehlerti praecursor and P. michelini barroisi.
In order to build up a background to the relative difficulty for burning the different raw materials in cement production the solid phase reactions between SiO2 and either CaCO3 or BaCO3 at the temperatures ranging 500°-800°C were studied by measuring the amount of CO2 liberated during the reaction. Then, applying the…