Materials Literature
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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…
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 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…
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…
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…
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…
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…
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…
The physical characteristics, thermoelectric power, resistivity, specific heat conductivity, and the temperature difference between hot and cold junctions determine the efficiency of thermocouple materials. These data have been determined for Chromel P-constantan, bismuth alloys, and the intermetallic compound ZnSb, c…
An apparatus for making measurements of the Seebeck effect between 20\ifmmode^\circ\else\textdegree\fi{}K and 375\ifmmode^\circ\else\textdegree\fi{}K is described.Experimental curves of the Seebeck effect are given for a series of germanium crystals in which various concentrations of acceptor and donor atoms have been…
A theory is presented for concentration quenching in solid systems, based on the migration of excitation energy from one activator center to another and eventually to an imperfection which may act as an energy sink. Calculations are made on the dependence of the fluorescence yield on concentration, and to indicate typ…
Abstract A new, pressurized high-temperature Debye-Scherrer camera is described. The structures of γ- and δ-manganese are found to be face-centred cubic and body-centred cubic respectively. Accurate curves of lattice-spacing against temperature are given for both these phases, and also for the β-manganese phase, and t…
1. Cells of the fresh water diatom Navicula pelliculosa may be grown in a mineral medium containing a low concentration of silicon. When transferred to a fresh silicate solution and incubated under non-growing conditions such deficient cells rapidly take up silicon from the medium. 2. The utilization of silicon is an…
Abstract The kinetics of the polymerization of the N-carbonic anhydrides of DL-leucine, DL-phenylalanine and sarcosine in nitrobenzene solution have been studied. When preformed polymer is used as initiator, and in the complete absence of water, the first two anhydrides polymerize at rates which show first-order depen…
The crystals of N~O5.3S08 are monoclinic, with a = 19.54, b = 7.30, c = 7.56 A, fl = 102 .
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of Statistics to Reaction KineticsW. R. McBride and D. S. VillarsCite this: Anal. Chem. 1954, 26, 5, 901–904Publication Date (Print):May 19, 1954Publication History Published online1 May 2002Published inissue 19 May 1954https://pubs.acs.org/doi/10.1021/ac60089a02…
In materials with the spinel structure, such as the ferrites, the cations are located on two different types of crystallographic sites. Expressions are derived for the equilibrium distribution of cations in mixed ferrites, which contain three different types of cations.It is suggested that the cation distributions in…
Abstract When polymethylmethacrylate in the solid form is irradiated in the atomic pile, or with γ-radiation, two reactions predominate: breakdown of the main chain, and decomposition of the side chain with evolution of gases. The former was followed by changes in viscosity, the molecular weight of the irradiated poly…
Abstract The stresses round a piled-up group of dislocations are investigated with reference to the initiation of a crack. A crack should form when the group consists of about 1000 dislocations piled up under a stress of the magnitude occurring in a cold-worked metal. The stress system due to the crack is obtained. Th…
Abstract As a part of a broad programme of investigation of sodium hydroxide, the transitions up to its melting point were studied. This was accomplished by correlation of results obtained through use of differential thermal, high‐temperature microscopic, and high‐temperature X ‐ray analyses. The melting of sodium hyd…