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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…
Abstract Heating rubber‐carbon black mixtures at elevated temperatures results in vulcanizates with lower electrical conductivity, lower hysteresis, lower Durometer hardness, and increased abrasion resistance. These changes are apparently the result of chemical reactions between carbon black and rubber which alter the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Composition of Some Tetra-t-butyl Titanate-Glycol Reaction Products2Richard E. Reeves and Laurence W. Mazzeno Jr.Cite this: J. Am. Chem. Soc. 1954, 76, 9, 2533–2536Publication Date (Print):May 1, 1954Publication History Published online1 May 2002Published inissue 1 May 1…
Strength and elongation measurements were made on single cotton fibers and on yarns which had been subjected to various temperatures from 110° to 162°C and various moisture conditions from 3% R.H. up to saturation for periods of heating from 2 to 128 hrs. Moisture contents and degrees of polymerization were also deter…
Fast oscilloscopic time analysis of the negative point Trichel pulse corona in room air at various pressures and gap geometries reveals the following data. The very short rise and quenching time of the pulse at atmospheric pressure observed by English is confirmed. Under these conditions the secondary action is a phot…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of Filiform CorrosionW. H. Slabaugh and Morris GrotheerCite this: Ind. Eng. Chem. 1954, 46, 5, 1014–1016Publication Date (Print):May 1, 1954Publication History Published online1 May 2002Published inissue 1 May 1954https://pubs.acs.org/doi/10.1021/ie50533a053https:/…
The effect of corona on the long-time dielectric strength of insulation is emphasized in this paper, and various factors influencing the breakdown of insulation with corona are discussed. Data on the corona threshold voltages on dielectric surfaces at electrode edges show that the threshold voltage varies for a wide v…
A study of gypsum was made using the differential thermal analysis technique. Gypsum and mixtures of gypsum with silica, alumina, iron oxide, dialyzed kaolin, or carbon were analyzed. Furnace atmospheres of air, nitrogen, carbon dioxide, and carbon monoxide were used. Gases evolved at the decomposition temperature of…
The acoustic noise spectrum associated with the collapse of transient cavities produced by a stirring rod in water was measured in the frequency range 1–3500 kc. While the spectrum, in general, goes as f−2 above 1 kc, flat regions are found between 20 kc and 100 kc, and again above 500 kc to at least 3500 kc. If the f…
A method for measuring the Hall mobility in insulating photoconductors is described which avoids the space-charge difficulties present in previous measurements. Unconventional electrodes are used, and the method differs from the conventional one in several other ways. It is a transient method, and the electric field i…
A constriction (defined as a point at which the two partial dislocations are recombined) must be formed before an extended dislocation can climb. The energy required is found to be about 6 eV, but may be reduced in the presence of an applied stress. Constrictions are more easily formed in Cottrell-Lomer locked disloca…
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