Materials Literature
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The filtering rates of Calanus helgolandicus were measured on synchronously growing populations of the diatom Ditylum brightwellii, by following changes in cell numbers and also by measuring the ingestion of 14 C labeled cells at selected intervals during 2‐day periods. The growth of the diatoms was adjusted to be one…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic pnicogen complexes. III. Preparation and structural characterization of the triarsenic-cobalt atom cluster system As3Co(CO)3. The first known X3-transition metal analog of group VA tetrahedral X4 moleculesAlan S. Foust, Michael S. Foster, and Lawrence F. DahlC…
Auszug Die KristaIIstruktur von Fresnoit, Ba2(TiO)Si207, wurde aus der PattersonProjektion P(uv) bestimmt und nach der Methode der kleinsten Quadrate aus hkl-Interferenzen verfeinert. Eigentfunlich fur die Struktur ist die tetragonalpyramidale Umgebung des Titans. Schichten aus heterozyklischen Hinfgliedrigen Ringen,…
SUMMARY.— A modified radiographic method for measuring skin thickness has been described; it has given consistent results. Normal values have been ascertained for adult males and females. It is suggested that this method will be of value in studying conditions in which changes in skin thickness are to be expected.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVaporization reactions of vanadium iodides and evidence for gaseous vanadium(IV) iodideK. O. Berry, R. R. Smardzewski, and R. E. McCarleyCite this: Inorg. Chem. 1969, 8, 9, 1994–1997Publication Date (Print):September 1, 1969Publication History Published online1 May 2002Publi…
Abstract A useful concept in polymer science is the degree of crystallinity—the fraction of the polymer that exists in a relatively ordered state. Methods of determination of the degree of crystallinity using density, infrared, thermal, N.M.R. and X‐ray measurements are examined in light of modern notions of the struc…
Abstract Carbon black particle and aggregate microstructure were studied in detail by means of high resolution electron microscopy. Improved instrumental and environmental conditions have enabled more detailed studies on the size, orientation, and spacing of graphite layers in carbon black particles than heretofore po…
The hydration of tricalcium silicate was studied using a sample with a limited particle size distribution. The hydration reaction was analyzed as an example of general solid reactions having induction and acceleration periods. The first product, which may have a structure similar to the reactant, forms on the surfaces…
Yield criteria for plastic deformation on glassy high polymers induced by stress field, noting crazing and shear yielding dependence on first stress invariant
The phase relations in a portion of the 1375° isotherm of the system Sr‐Ti‐O were determined. The following ternary phases were identified: Sr 2 TiO 4 , Sr 3 Ti 2 O 7 , Sr 4 Ti 3 O 10 , SrTiO 3 (ss), and what is believed to be SrTi 12 O 19 . The experimental techniques used in the determination of tha phase diagram ar…
The technology of making SmCo5 magnets with energy products of 20 × 106 GOe is described. This technology consists of the preparation of a powder by grinding, aligning the powder particles in a magnetic field, and cold pressing by applying a uniaxial deformation at 20 kbar. The permanent magnetic properties of the SmC…
The main types of noise in ferromagnetic materials are thermal or Nyquist noise, excess noise, and Barkhausen noise. They differ in magnitude as well as in the frequency dependence of their associated power spectra. The comparatively weak Nyquist noise is generated by the thermal energy of the conduction electrons and…
SUMMARY: Many attributes contribute to texture, and panel tests should be so arranged that all these attributes are analyzed. The texture profile concept used by Szczesniak and her co‐workers is critically examined, and several modifications are proposed. The new scheme consists of primary, secondary and tertiary cate…
As a part of our structural, optical, and electrical studies of amorphous versus crystalline GeTe films, this paper (Part I) reports on the growth and structural properties of the thin-film polymorphs (amorphous, rhombohedral, and NaCl) of GeTe. When deposited above ∼130°C, the GeTe films are polycrystalline. Epitaxia…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Properties of Block Polymers. I. Poly-α-methylstyrene-Polyisoprene-Poly-α-methylstyreneLewis J. Fetters and Maurice MortonCite this: Macromolecules 1969, 2, 5, 453–458Publication Date (Print):September 1, 1969Publication History Published online1 May 2002Publis…
This paper presents measurements of the acoustic emission from gas bubbles of controlled sizes “seeded” into water and glycerol-water mixtures and subjected to sound fields over a wide range of frequencies and intensities up to, and beyond, the transient cavitation threshold. The emission from unprepared liquids was a…
Hydrothermal solutions, advanced argillic-type alteration, alunite-kaolinite and alunite-muscovite compositional relations
Summary A specimen from Långban, Sweden, was found to consist largely of sjögrenite in which segregation and ordering of the metal cations had occurred, yielding an intergrowth of regions of two main types with compositions probably of or near Mg 2/3 Fe 1/3 (OH) 2 (CO 3 ) 1/6 (H 2 O) 0·4 and Mg 12/13 Fe 1/13 (OH) 2 (C…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent Effects on the Preferred Conformation of Poly(ethylene glycols)Kang-Jen Liu and John L. ParsonsCite this: Macromolecules 1969, 2, 5, 529–533Publication Date (Print):September 1, 1969Publication History Published online1 May 2002Published inissue 1 September 1969https…
Abstract The circular dichroism (CD) spectrum of an unordered polypeptide chain does not correspond, as has been assumed heretofore, to that of a charged chain such as poly‐ L ‐glutamic acid or poly‐ L ‐lysine. The latter have been shown to have locally ordered structures with characteristic CD spectra. We have now ob…