Manual of cement testing
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Las pérdidas de polvo en los hornos rotatorios de cemento
Se analizan algunos procedimientos tanto para evitar la formación de polvo en los hornos rotatorios como para recuperarlo, en el caso de haberse producido.
Good blasting practice can improve community relations
Este procedimiento de realizar voladuras evitan los lanzamientos de rocas, las vibraciones del suelo y la onda explosiva.
Chain scissions in a polymer network
Abstract Relations between the soluble fraction and the number of effective chains between crosslinks in a three‐dimensional network undergoing a scission reaction have been derived. Three limiting cases have been considered: (a) random scission in the chains, (b) scission in the chains directed by the crosslinks, and…
Electrolytic Shaping of Germanium and Silicon
Properties of electrolyte-semiconductor barriers are described, with emphasis on germanium. The use of these barriers in localizing electrolytic etching is discussed. Other localization techniques are mentioned. Electrolytes for etching germanium and silicon are given.
The absorption spectra of natural and irradiated diamonds
Abstract The absorption spectra of fifty-two natural diamonds have been measured at 80 and 290°K. Type I diamonds are shown to have two kinds of absorption centres which are not detected in type II diamonds. Differences in the infra-red absorption spectra between type IIa and type IIb diamonds are reported. The classi…
Infrared Absorption and Oxygen Content in Silicon and Germanium
An optical absorption band at 9\ensuremath{\mu} has been correlated with the oxygen content in silicon. Pulled silicon crystals were found to contain up to ${10}^{18}$ oxygen atoms per ${\mathrm{cm}}^{3}$ which seem to originate from the quartz crucible. The oxygen concentration in silicon crystals prepared by the flo…
The tensile properties of single crystals of high-purity iron at temperatures from 100 to ─253°C
Abstract An account is given of the deformation and fracture characteristics of single crystals of high-purity iron of various orientations when tested in tension at temperatures from 100 to ─253°C. At temperatures down to ─124°C, the crystals were fully ductile, giving chisel-edge fractures and 100% reduction in area…
A Theory of Flame-Retardant Finishes
A survey of the newer flame retardants suggests a simple theory for their constitu tion. The molecule should be water-insoluble to achieve durability in laundering. A solvent-soluble organic molecule is therefore proposed. The ortho-phosphate group should be present in the molecule to dehydrate catalytically the cellu…
The Influence of Chemisorbed Gases on the Magnetization of Catalytically Active Nickel1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Influence of Chemisorbed Gases on the Magnetization of Catalytically Active Nickel1Louise E. Moore and P. W. SelwoodCite this: J. Am. Chem. Soc. 1956, 78, 4, 697–701Publication Date (Print):February 1, 1956Publication History Published online1 May 2002Published inissue 1…
Paramagnetic Resonance in Cu(NH3)4SO4·H2O
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation E. H. Carlson, R. D. Spence; Paramagnetic Resonance in Cu(NH3)4SO4·H2O. J. Chem. Phys. 1 February…
Thermal expansion of binary alkaline-earth borate glasses
The thermal expansivity of a number of calcium, strontium , and barium borate glasses are reported.The ex pansivity of the calcium and strontium borates increases with increasing alkaline-earth oxide concentration.Th e expansivity of the barium borate glasses is a m inimum at about 20 mole percent of barium oxide.The…
Preparation of Pure Potassium Metaniobate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of Pure Potassium MetaniobateArnold Reisman, Frederic Holtzberg, Sol Triebwasser, and Melvin BerkenblitCite this: J. Am. Chem. Soc. 1956, 78, 4, 719–720Publication Date (Print):February 1, 1956Publication History Published online1 May 2002Published inissue 1 Febr…
Ferromagnetic Domain Nucleation in Silicon Iron
Powder deposit patterns obtained by the authors on single crystals of 3% silicon iron are consistent with a description of the processes of domain phase creation in terms of nucleation at inclusions in the surfaces. Domain nucleation is discussed in relation to various magnetic properties.
High Temperature Heat Content and Heat Capacity of Al2O3 and MoSi2.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Temperature Heat Content and Heat Capacity of Al2O3 and MoSi2.B. E. Walker, J. A. Grand, and R. R. MillerCite this: J. Phys. Chem. 1956, 60, 2, 231–233Publication Date (Print):February 1, 1956Publication History Published online1 May 2002Published inissue 1 February 195…
Heterogeneity in Montmorillonite
Abstract X-ray diffraction patterns and cation-exchange data are presented for centrifuged Wyoming bentonite to demonstrate the heterogeneous nature of montmorillonite. It has been shown that in the bentonite samples studied, the montmorillonite can be separated into at least two fractions. One phase consists of essen…
Thermal Decomposition of Nitrogen Dioxide
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Willis A. Rosser, Henry Wise; Thermal Decomposition of Nitrogen Dioxide. J. Chem. Phys. 1 Februar…
Diagenetic Modification of Clay Mineral Types in Artificial sea Water
Abstract Analyses of samples of kaolinitic, illitic, and montmorillonitic clay materials exposed to artificial sea water for periods of six months to five years have yielded some evidence to support the contention that chloritic and illitic clay types may ultimately develop from montmorillonitic material in the marine…
Properties of Guanidine Aluminum Sulfate Hexahydrate and Some of Its Isomorphs
Guanidine aluminum sulfate hexahydrate (C${\mathrm{N}}_{3}$${\mathrm{H}}_{6}$)Al${(\mathrm{S}{\mathrm{O}}_{4})}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}6${\mathrm{H}}_{2}$O is ferroelectric from as high a temperature as it will stand for a short time (about 200\ifmmode^\circ\else\textdegree\fi{}C), down to tempe…
An investigation of the theory of rubber elasticity using irradiated polydimethylsiloxanes
Abstract High‐energy electrons were used to crosslink a series of polydimethylsiloxanes. Equilibrium tension measurements at low elongations were used to determine the number of chains between crosslinks as given by the kinetic theory of elasticity. After a rapid increase at low radiation doses the number of chains wa…