Materials Literature
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The iodine sorption test is a convenient though empirical method of measuring cellulose accessibility, but results show considerable variability. The relative importance of some experimental factors with respect to reproducibility of test results was, therefore, examined. Agitation during equilibration and use of a st…
The results of a preliminary study on the dosimetric characteristic of three different grades of commercial sintered beryllium oxide are reported. Among useful features of this promising thermoluminescent material a very low sensitivity to thermal neutrons (0.2 gamma -rads equivalent per 10 10 neutrons cm -2 ), a fair…
A series of crystalline metal glycerolato complexes has been prepared. The preparation of the cobalt, zinc, manganese, and iron complexes [(1 )-(4)] was achieved by heating (above 110º) glycerol with metal acetates, carbonates, oxalates, oxides, or hydroxides. The structure of (1) has been determined by X-rays and con…
Electron microscopic studies using thin sections revealed that Thermus aquaticus has a structure similar to that of most other gram-negative bacteria. The cell envelope is tripartite: plasma membrane, thin middle layer, and a thicker and irregular outer layer. The outer layer appears to be joined to the plasma membran…
The dynamic characteristics of a gas bubble situated in a viscoelastic fluid of three-parameter Oldroyd model is analytically investigated. Consideration is given to the influence of the thermodynamic process of the gas inside the bubble. An equation is derived which governs the timewise variation of the bubble size.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of barium sulfate to sulfur dioxide for mass spectrometric analysisBen D. Holt and A. G. EngelkemeirCite this: Anal. Chem. 1970, 42, 12, 1451–1453Publication Date (Print):October 1, 1970Publication History Published online1 May 2002Published inissue 1 O…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of maltose monohydrateGary J. Quigley, A. Sarko, and R. H. MarchessaultCite this: J. Am. Chem. Soc. 1970, 92, 20, 5834–5839Publication Date (Print):October 1, 1970Publication History Published online1 May 2002Published inissue 1 October 1970ht…
A complete classification of representations of SO(4, 2) with infinitesimal generators SAB, characterized by the representation relation {SAB, SAC} = −2agBC, and their extension by parity have been determined. The possible values of a are a = 1 − S2, S = 0, 12, 1, 32, 2, ⋯. These representations have then been reduced…
Accurate lattice parameter, hydrostatic density and Curie temperature measurements have been made on lithium tantalate single crystals grown from different melt compositions. Crystal compositions were determined by comparing crystal Curie temperatures with those determined from well reacted ceramic specimens of known…
The dependence of the equilibrium configurations of a thin single-crystalline epitaxial film, on the strengths of substrate-overgrowth and overgrowth-overgrowth bonds and the interfacial misfit is calculated neglecting substrate deformations. Previous analyses of the system were based on a one-dimensional model, allow…
W M Stacey, Jr London: Academic Press 1969 pp vii + 186 price £6 1s Timely, well written but expensive are the reviewer's immediate reactions to this publication. Enlarging on these remarks, in reverse order, the book costs £6 1 s and has less than 200 pages; whilst quantity does not mean quality this seems a great pr…
A phenomenological theory is presented of the magnetic properties of two-component alloys, one of whose components has a permanent magnetic moment, and the other an exchange-enhanced paramagnetic susceptibility. The paramagnetic susceptibility, magnetic-ordering temperature, and magnetization at low temperature are di…
Abstract The current theoretical treatment of diffusion of gases in glassy polymers is based on the “dual sorption” model, but also includes certain other important assumptions, at least some of which cannot be fully justified a priori . They require experimental validation, which, however, is not possible by the proc…
Niobium-selenium compounds in the composition range NbSe2–Nb1.14Se2 can form layered crystals which are readily cleaved in a direction perpendicular to the c axis. For compositions in the range NbSe2–Nb1.05Se2, two structures, a high-temperature ζ phase and a lower-temperature ε phase may be formed. Single crystals of…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Abstract The morphology of selenium has been studied in light of present concepts of crystallinity in crystalline organic polymers. Spherulitic crystallization and resultant morphology were examined as a function of temperature by transmission and replication electron microscopy, electron diffraction, and optical micr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of molecular structure on infrared spectra of six isomers of bipyridineCarol K. Pearce, Dietmar W. Grosse, and William HesselCite this: J. Chem. Eng. Data 1970, 15, 4, 567–570Publication Date (Print):October 1, 1970Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubilities of calcium in liquid calcium chloride in equilibrium with calcium-copper alloysRam Auter SharmaCite this: J. Phys. Chem. 1970, 74, 22, 3896–3900Publication Date (Print):October 1, 1970Publication History Published online1 May 2002Published inissue 1 October 1970…
Abstract The chemical reactions responsible for the retardation of thermal discoloration in poly(vinyl chloride) (PVC) stabilized with a combination of an epoxy plasticizer and a heavy metal soap mixture of Group IIa and IIb metals have been studied. Allylic chlorides (a mixture of 4‐chlorohexene‐2 and 2‐chlorohexene‐…
Abstract Thermogravimetric (TG) investigations of various substituted polysiloxanes of the type \documentclass{article}\pagestyle{empty}\begin{document}$ \rlap{--} ({\rm R}_1 {\rm R}_2 {\rm SiO\rlap{--} )}_n $\end{document} have been carried out in vacuo and the activation energies for the depolymerization processes c…