Materials Literature
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Abstract Es wird über erste Versuche berichtet, elektronenmikroskopische Hellfeldaufnahmen schwacher Phasenobjekte nachträglich durch Anwendung von Rekonstruktionsmethoden rechnerisch zu korrigieren. Der interessierende Bildbereich wird von einem automatischen Photometer abgetastet und in digitaler Form repräsentiert.…
The angular distribution of ${\mathrm{O}}^{\ensuremath{-}}$ produced by electron bombardment of ${\mathrm{O}}_{2}$ has been measured in the electron energy range 5.75-8.40 eV. The results show a strong energy dependence and are consistent with the theory of O'Malley and Taylor if the final $\mathrm{O}_{2}^{}{}_{}{}^{\…
Thin parylene films have been prepared and are available in thicknesses to 0.025 μ. The parylene polymers are shown to be extremely uniform in thickness, have good gas barrier properties, and are relatively nonabsorbing throughout the entire soft x-ray region. Comparisons are made with commercially available Mylar, po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNature of adsorbed propylene on zinc oxide. I. Formation of .pi.-allyl speciesRichard J. Kokes and A. L. DentCite this: J. Am. Chem. Soc. 1970, 92, 23, 6709–6718Publication Date (Print):November 1, 1970Publication History Published online1 May 2002Published inissue 1 Novembe…
Mutant strains were isolated from Salmonella typhimurium and Escherichia coli deficient in either Enzyme I or the phosphate carrier protein of a bacterial phosphotransferase system. The mutants behaved identically in terms of their growth properties on some carbohydrates, but differed on others. The variations are dis…
At 1100 kV, transient overvoltages caused by switching transmission lines pose the greatest stress to system insulation. These overvoltages must be limited to realistic values to make 1100- kV transmission economically attractive. Various altematives for limiting switching surges including controlled and uncontrolled…
The anodic dissolution of Mo was studied in HCl-KCl solutions at 25 C (77 F). The apparent valences of Mo ions going into solution were approximately six. Slightly lower values were obtained in HCl solutions, the more pronounced changes occurring in the higher acid concentrations. The resultant ions in solution were M…
The thermal conductivity of ThO2-UO2 and ThO2-CeO2 systems were measured by laser flash method, and the results are discussed with the aid of the relaxation-time theory. Two parameters characteristic to systems of the same base — the ratio α of scattering rates between N- and U-scatterings and the strain parameter ϵ—…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic reactions by complex catalysts. XVIII. Reaction of an azide with isocyanide using an iron carbonyl catalyst. New route to carbodiimideTakeo Saegusa, Yoshihiko Ito, and Toyoji ShimizuCite this: J. Org. Chem. 1970, 35, 11, 3995–3996Publication Date (Print):November 1…
Abstract Sulfuration by CBS acceleration both in presence and absence of ZnO and stearic acid with or without DCP has been studied in detail. It is observed that CBS increases the rate of DCP decomposition and decreases the crosslinking maxima due to DCP—ultimately leading to zero cross links with high amounts of CBS.…
Phase equilibrium relations in the celsian‐silica‐alumina portion of the system BaO‐Al 2 O 3 −SiO 2 were revised on the basis of data obtained from isothermal firing and from the quenching method. These data verify the existence of a celsian‐silica compatibility join by reducing the extent of the mullite field shown i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of Liquid-Solid Reactions. Hydrochloric Acid-Calcium Carbonate ReactionB. B. Williams, J. L. Gidley, J. A. Guin, and R. S. SchechterCite this: Ind. Eng. Chem. Fundamen. 1970, 9, 4, 589–596Publication Date (Print):November 1, 1970Publication History Published…
Spontaneous cross-linking in vitro, during incubation of purified collagen in nonstriated and native type fibrils, was studied to elucidate the relationship between intra and intermolecular cross-links. In nonbanded fibrils, the aldol condensation products of two allysyl residues, previously shown to constitute the in…
A critical assessment of the merits of core-spinning by means of comparisons of the strength and extension of core-spun yarns with all-staple-fibre yarns forms the basis of this paper. Core-spinning was done by introducing the filament under tension into the drafted strand as the latter entered the front rollers of th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical Properties of Poly(β-hydroxy butyrate). III. Folding of Helical Segments in 2,2,2-TrifluoroethanolJ. Cornibert, R. H. Marchessault, H. Benoit, and G. WeillCite this: Macromolecules 1970, 3, 6, 741–746Publication Date (Print):November 1, 1970Publication History Publi…
Dislocations and disolinations in crystals are described in part by trans-lational and rotational symmetry operations respectively of the perfect crystal. A third type of Weingarten-Volterra defect, the dispiration, which depends on the presence of screw symmetries in the perfect crystal is introduced and defined. The…
A cell has been constructed with a thin film electron transparent window and a built-in transmitted electron detector for the examination of specimens in the scanning electron microscope at atmospheric pressure and in the presence of water. At 20 kV a resolution of approximately 0·1 μm has been attained with wet polys…
Abstract Eine untere Grenze für die Gefährdung organischer Moleküle bei dem Versuch, einzelne ihrer Atome abzubilden, ist dadurch gegeben, daß die Atome bei der elastischen Ablenkung der abbildenden Elektronen einen Rückstoß erfahren, der zum Zerreißen der chemischen Bindungen führen kann. Bei dünnen Objekten hängt di…
Cylindrotheca fusiformis Reimann & Lewin, a marine littoral pennate diatom, can grow in the dark in media containing an organic substrate. Lactate, succinate, fumarate, malate, Tryptone, Casamino Acids, or Yeast Extract can serve as substrate. Glucose apparently cannot be used for heterotrophic growth. Cells taken…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMass Transfer Characteristics of Woven-Wire Screen CatalystsC. N. Satterfield and D. H. CortezCite this: Ind. Eng. Chem. Fundamen. 1970, 9, 4, 613–620Publication Date (Print):November 1, 1970Publication History Published online1 May 2002Published inissue 1 November 1970https…