Effect of quebracho extract on clays
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Materials Literature
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Alcune incompatibilitá nei miscugli e contatti fra cementi di diversa natura
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Lime caloination and hydration
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Silicone-base compound is waterproofing agent
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Le ciment de laitier dans la construction
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Energy Transfer in Organic Phosphors
A quantitative theory is developed of the photofluorescence and scintillation properties of organic materials. On this theory the intermolecular energy transfer occurs by photon emission and absorption; the molecular emission spectrum extends continuously from the ionization energy ${E}_{I}$ down to the strong fluores…
Domain Clamping Effect in Barium Titanate Single Crystals
We have found that the dielectric constant of good single crystals of barium titanate decreases as the average polarization is decreased by means of an electric field. This has been interpreted as being due to a domain clamping effect arising from the multidomain situation in the crystal that accompanies the reduction…
Magnetic and Electric Properties of Magnetite at Low Temperatures
The low-temperature transition in magnetite, according to Verwey, is due to the ordering of the ferrous and ferric ions in the octahedral interstices of the spinel lattice. This arrangement would require a symmetry change from cubic to orthorhombic. X-ray diffraction indicates and electric conductivity and magnetizati…
Molecular-weight changes in the degradation of long-chain polymers
Abstract The changes in molecular weight of a long-chain polymer (initially of arbitrary molecular-weight distribution) are studied when the main chain is subjected to random fracture, such as occurs when certain polymers are exposed to high-energy radiation. For several distributions studied, all trace of the initial…
Threshold Field and Free Energy for the Antiferroelectric-Ferroelectric Phase Transition in Lead Zirconate
Sawaguchi and Kittaka obtained the threshold field of PbZr${\mathrm{O}}_{3}$---that field necessary to change the antiferroelectric to the ferroelectric phase---below the Curie temperature. The free-energy difference is the difference between the area under the ferroelectric portion of the curve and that under the ant…
A dynamic foam test for evaluation of hand dishwashing compositions
Summary A dynamic foam test for evaluation of hand‐dish‐washing compositions has been developed which gives good correlation with semipractical plate washing tests. Properties measured in the dynamic tests are foam build‐up index, foaming capacity, and stability of foam to soil.
The Vapor Pressure of Zinc between 150° and 350°C
The vapor pressure of zinc has been measured by the Knudsen effusion method using the radioisotope Zn65. Measurements have been made from 150° to 350°C, and the temperature-vapor pressure relation over this range was found to be log10Pmm=—7198/T+9.664. The heat of vaporization was calculated to be 31.35 kcal per mole…
The ketonic carotenoid canthaxanthin isolated from a colour mutant of Corynebacterium michiganense
During investigation of the carotenoids produced by mutant strains of the bacterial phytopathogen Corynebacterium michiganense (E. F. Smith) Jensen The present report summarizes the experiimental work that leads to the conclusion that the C. michiganense pigment is indeed identical with fungal cantha- xanthin. In addi…
Structure of Gd, Dy, and Er at Low Temperatures
The crystal structures of gadolinium, dysprosium, and erbium metals have been determined over a wide temperature range. The metals are hexagonal close packed and the ${a}_{0}$ unit axis contracts nearly linearly with decreasing temperature, whereas the ${c}_{0}$ unit axis exhibits an abnormal expansion with decreasing…
Calculations of the First Ferromagnetic Anisotropy Coefficient, Gyromagnetic Ratio and Spectroscopic Splitting Factor for Nickel
Calculations are made of the first anisotropy coefficient K 1 and of the spectroscopic splitting factor g for nickel, based on the collective electron theory of the corresponding effects due to Brooks and the calculations of the author of the N ( E ) curve for the 3d electrons in nickel. Brooks' theory is reviewed, th…
Effect of Alloying and Impurity Elements In Magnesium Alloy Cast Anodes
Data from extensive laboratory anode efficiency tests and supporting field tests illustrate the need for low impurity levels in the 6% Al—3% Zn magnesium alloy cast anodes. Data are presented which show the detrimental effects of the impurities copper, nickel, iron, lead and tin; the beneficial effect of manganese in…
Some Magnetic Properties of Dy Metal
The magnetic moment of dysprosium has been measured in applied fields of 4000-18 000 oersteds, over the temperature range of 4.2-202\ifmmode^\circ\else\textdegree\fi{}K. The susceptibility of dysprosium was found to be field dependent below about 175\ifmmode^\circ\else\textdegree\fi{}K. Below 90\ifmmode^\circ\else\tex…
Permeability of Kaolinite
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPermeability of KaoliniteAlan S. Michaels and C. S. LinCite this: Ind. Eng. Chem. 1954, 46, 6, 1239–1246Publication Date (Print):June 1, 1954Publication History Published online1 May 2002Published inissue 1 June 1954https://doi.org/10.1021/ie50534a041RIGHTS & PERMISSIONSArti…
Infrared spectrophotometric studies on polyethylene. II. Oxidation
Abstract Polyethylene can be heat‐oxidized in air when temperatures in excess of 125°C. are employed or photo‐oxidized when exposed to ultraviolet radiation during weathering. Infrared spectrophotometric studies show that during these types of oxidation carbonyl groups are formed and the concentrations of the three ty…
Effect of Grain Size on the Crystal Structure of Cobalt
The paper gives an account of measurements made on the lattice parameter of cobalt when the material contained crystal grains of different sizes as found in fine dust, filings and annealed solid rod. The stable structure of cobalt was found to depend upon the grain size: between room temperature and about 450°c when t…