Standard method for test for soundness of hydraulic cement-over boiling water (pat test)
No disponible
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Standard methods of sampling hydraulic cement
No disponible
Standard methods of chemical analysis of portland cement
No disponible
Can the rate of wash load be predicted from the bed‐load function?
There exist two types of sediment load, one that bears a certain relationship with the discharge (bed‐material load), and the other which does not (wash load). The result of flume study indicates that the transport rate of wash load, just as that of the bed‐material load, can be calculated according to the Einstein be…
Influence of Electric and Magnetic Fields on Angular Correlations
The theory of the influence on angular correlations of perturbing interactions in the intermediate state is reformulated to allow the description of the effects of time-dependent as well as of static perturbations. For static interactions of the nuclear electric quadrupole moment with crystalline fields of axial symme…
Structure analysis of single crystals by electron diffraction. III. Modification of alumina
An electron-diffraction study of the oxide films formed by heating aluminium foil in air on metal grid supports has revealed the occurrence of a number of new phases arbitrarily designated the h,/~, v, ~ and ~' phases. Except for the h-phase, all these phases may be indexed in terms of hexagonal unit cells with a ~ 5…
The thermal conductivity of diamond at low temperatures
Abstract The thermal conductivity of a type I diamond has been measured between 2° K and room temperature. Above 100° K the temperature variation of conductivity accords with Peierls’s theory of Umklapp processes. To account for the results at the lowest temperatures it is necessary to assume that some specular reflex…
Notizen: Über Darstellung und Eigenschaften von Calciumaluminiumhydrid Ca(AlH4)2
Calciumaluminiumhydrid wird durch Umsetzung von Aluminiumchlorid und Calciumhydrid in Tetrahydrofuran dargestellt. Das aus der Losung gewonnene Festprodukt enthalt auch in trockenem Zustand noch 40—50% Tetrahydrofuran und ist in seinen Eigenschaften dem Lithiumaluminiumhydrid weitgehend ähnlich.
Experiments with an Alkali Swelling-Centrifuge Test Applied to Cotton Fiber
A quantitative technique has been developed in which a weighed sample of cotton fiber is swollen in sodium hydroxide, centrifuged to remove liquid from between the fibers, and re weighed to determine its percentage increase in weight, the latter quantity being designated here as the fiber's "alkali-centrifuge value."…
The Infrared Spectrum of Brucite [Mg(OH)_2]*
The infrared spectrum of single crystals of brucite [Mg(OH)2] has been examined under high resolving power between 2 and 3μ. It contains at least 16 bands most of which are shown to be OH stretching frequencies and which exhibit a variety of polarization properties. It follows that the unit cell of brucite must be muc…
The Stability Constants of Cadmium Chloride Complexes: Variation with Temperature and Ionic Strength1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Stability Constants of Cadmium Chloride Complexes: Variation with Temperature and Ionic Strength1Cecil E. Vanderzee and Harold J. Dawson Jr.Cite this: J. Am. Chem. Soc. 1953, 75, 22, 5659–5663Publication Date (Print):November 1, 1953Publication History Published online1…
Mechanism of the crystallization of high polymers
Abstract In this article a conception of the mechanism of crystallization is given, on the basis of which, it is suggested the origin of spherulites might be explained. A tentative explanation of several related phenomena is based on the new concept. Crystallites are conceived to be small collections of strongly orien…
Annealing of Bombardment Damage in a Diamond-Type Lattice: Theoretical
The annealing of isolated interstitial-vacancy pairs presumably introduced by bombardment is considered theoretically with special attention paid to the diamond-type lattice. It is proposed that the annealing can be divided into three stages. First, those vacancy-interstitial pairs having a small initial separation wi…
CXXVIII. Stable dislocations in the common crystal lattices
On the assumption that the energy per unit length of a dislocation line is proportional to the square of the Burgers vector, the stability of dislocations in simple cubic, face-centred cubic, diamond, hexagonal close-packed, and body-centred cubic lattices is discussed. It is shown that in each of these lattices, ther…
A Study in the Mechanics of Crystal Growth from a Supersaturated Solution
An experimental investigation of the concentration field during crystallization is made using an improved modification of W. F. Berg's interference technique. Na2S2O3·5H2O is crystallized at 23°C; concentrations between 40 percent and 55 percent. Graphing the positions of the growing faces versus time indicates, in al…
The Crystal Structure of Samarium Metal and of Samarium Monoxide1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure of Samarium Metal and of Samarium Monoxide1F. H. Ellinger and W. H. ZachariasenCite this: J. Am. Chem. Soc. 1953, 75, 22, 5650–5652Publication Date (Print):November 1, 1953Publication History Published online1 May 2002Published inissue 1 November 1953ht…
Recent Work on Molecular Weight of Cellulose
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRecent Work on Molecular Weight of CelluloseE. H. Immergut, B. G. Ranby, and H. F. MarkCite this: Ind. Eng. Chem. 1953, 45, 11, 2483–2490Publication Date (Print):November 1, 1953Publication History Published online1 May 2002Published inissue 1 November 1953https://pubs.acs.o…
Rates and activation energies of thermal degradation of styrene and acrylate polymers in a vacuum
Abstract A study was made of rates and activation energies of thermal degradation of poly meta ‐methylstyrene, poly‐alpha‐deuterostyrene, poly‐alpha‐methylstyrene, and hydrogenated polystyrene, in the styrene type of polymers; and of two methyl methacrylates and one methyl acrylate, in the acrylate type of polymers. T…
A METHOD FOR THE EVALUATION OF SOME LATTICE SUMS OCCURRING IN CALCULATIONS OF PHYSICAL PROPERTIES OF CRYSTALS
A method is described for the evaluation of sums of the inverse n th power of the distances from a point P to all points of a lattice. The sums are expressed in sums of Bessel functions or e-powers that converge rather rapidly and Riemann ζ functions. The procedure can be used for any position of P with respect to the…
Uranium Oxide Phase Equilibrium Systems: III, UO 2 –ZrO 2
The UO 2 –ZrO 2 phase equilibrium system contained no new compounds but was found to contain extensive solid solution. The UO 2 solid solution was cubic and extended up to 52 mole % ZrO 2 . Its lattice parameter varied from 5.46 to 5.32 a.u. with an increasing percentage of ZrO 2 . The zirconia solid solution when exa…