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Abstract Si 3 N 4 wird erhalten durch Reaktion von elementarem Silicum mit Stickstoff oder Ammoniak, bzw. durch thermische Zersetzung von Si(NH) 2 bei 1350°C. Es existieren zwei polymorphe Modifikationen, α‐Si 3 N 4 und β‐Si 3 N 4 . Reines α‐Si 3 N 4 entsteht nur aus Si(NH) 2 , alle anderen Präparate sind Mischungen d…
The "vertical" divergence of the beam in a counter diffractometer causes a broadening, and a shift of centre of gravity, of diffraction lines. The effects do not disappear as 2 theta tends to 180°, and hence present extrapolation methods fail to remove the errors introduced. Experimental results are quoted that are no…
Research Article| September 01 1957 Preparation and characterization of the isomaltodextrins J. R. Turvey; J. R. Turvey 1Department of Chemistry, University College of North Wales, Bangor, Caernarvonshire Search for other works by this author on: This Site PubMed Google Scholar W. J. Whelan W. J. Whelan 1Department of…
The infrared spectra of solid Hg(CN)2 and the mono- and di-substituted C13 and N15 species have been observed. The polarized spectrum of a single crystal of the normal species was also observed. The seven fundamental vibrations of the linear, symmetric Hg(CN)2 molecule have been assigned at 2192, 415, 2193.5, 442, 276…
The chain‐length distributions in solutions of sodium phosphate glasses were reinvestigated using improved paper chromatographic techniques. The range of compositions was extended to glasses of higher Na/P ratios by using a through‐flame technique for their preparation. The distributions obtained confirmed the earlier…
X-ray studies showed a wide variation in lattice parameters of synthetic albites crystallized under varying conditions of temperature, time, and pressure. The data indicate that an infinite number of stable intermediate forms can exist between high- and low-temperature albite, and support the conclusion that the latti…
The isotherm corresponding to monolayer adsorption and the equation of state of a monolayer at a liquid interface are derived. As previously, we replace the number of segments per chain actually deposited, by an average value, which is proportional to t½ (t total number of segments) and depends on chain flexibility. T…
Abstract The physical properties of vulcanized 1,4 polybutadienes, prepared by heterogeneous catalysis and ranging from 95 per cent cis to nearly 100 per cent trans configuration, were investigated in gum and tread formulations. Comparisons were made at equal effective (physical) degree of crosslinking for both gum- a…
Summary From molecular distillation data, and information obtained by hydrogenation in dilute solution, extents of reaction have been calculated for the polymerization of linseed, safflower, tung, and oiticica oils. The hydrogenation data indicate that more than one double bond per molecule can be consumed during poly…
Abstract The losses of bacteriostats from rubber-closed multidose containers of injections are confirmed, and the mechanism of these losses by absorption, diffusion and volatilisation is discussed. The present B.P. methods of pretreating rubber closures are inadequate, and methods for their more satisfactory equilibra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Gas Phase Constitution of Boric OxideMilton D. ScheerCite this: J. Phys. Chem. 1957, 61, 9, 1184–1188Publication Date (Print):September 1, 1957Publication History Published online1 May 2002Published inissue 1 September 1957https://pubs.acs.org/doi/10.1021/j150555a013http…
Summary A nephelinite from the extinct volcano Mt. Shaberu, North Kivu, Belgian Congo, contains two new minerals: Götzenite is triclinic with a 10·93, b 7·32, c 5·74 Å, α 90°, β 100°, γ 120°; the unit-cell contents approximate to (Ca,Na,Al) 7 (Si,Ti) 5 O 15 F 3·5 , and the optical constants are α 1·660, β 1·662, γ 1·6…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Equilibrium Constants and Oxidation-Reduction Potentials of Some Thiol-Disulfide Systems1Lorentz Eldjarn and Alexander PihlCite this: J. Am. Chem. Soc. 1957, 79, 17, 4589–4593Publication Date (Print):September 1, 1957Publication History Published online1 May 2002Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of Solutions. I1Terrell L. HillCite this: J. Am. Chem. Soc. 1957, 79, 18, 4885–4890Publication Date (Print):September 1, 1957Publication History Published online1 May 2002Published inissue 1 September 1957https://pubs.acs.org/doi/10.1021/ja01575a016https://doi.org/10.…
High frictional temperatures during the dry or imperfectly lubricated rubbing of steel produce gross structural changes and intense hardening of the surface layers. In consequence of these changes the wear time curve shows a marked inflexion, the wear rate of soft steel on soft steel diminishing by more than an order…
The thermal expansion of alkali halides has been investigated at very low temperatures and at high temperatures. Attention has been concentrated on the isotropic cases, for which a formal expression for the Gruneisen constant has been obtained. It is shown that the Gruneisen constant is expected to increase somewhat a…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text , "Journal of Ultrastructure Research," J. Opt. Soc. Am. 47, 866-866 (1957) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save ar…
Abstract Es wird an mehreren Hydroxy‐ und Amino‐phenoxazonen und ihren Acetaten gezeigt, daß Phenoxazone im IR‐Spektrum zwischen 6.0 und 6.5 μ drei charak‐teristische Schlüsselfrequenzen besitzen. Die Verschiebung der längstwelligen Bande im sichtbaren Spektrum dieser Verbindungen mit Säure und Alkali hängt von der St…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSTEROIDAL LACTONESJ. A. Cella and C. M. KagawaCite this: J. Am. Chem. Soc. 1957, 79, 17, 4808–4809Publication Date (Print):September 1, 1957Publication History Published online1 May 2002Published inissue 1 September 1957https://pubs.acs.org/doi/10.1021/ja01574a058https://doi…
A previously published phenomenological theory of the statistics and time dependence of the creep failure of oriented polymeric filaments is here applied to bundles of filaments. The mathematical apparatus of the theory of stochastic processes is used to calculate relationships between the strength of filament bundles…