Materials Literature
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Abstract In Abhängigkeit von der durch Natronlaugenbehandlung hervorgerufenen Gitterumwandlung werden Veränderungen der übermolekularen Struktur von Linters‐Cellulose durch geeignete Parameter (Kristallinitätsgrad, Ordnung und Größe der kristallinen Bereiche) charakterisiert. Die Anwendung des Verfahrens nach Ruland‐V…
I.r. bands due to dissociative adsorption of hydrogen onto ZrO2 at room temperature were observed by Fourier transform i.r. spectroscopy at 3780 and 3668 cm–1 for ZrOH and at 1562 and 1371 cm–1 for ZrH and ZrHZr, respectively.
Sericin gene expression in the middle silk glands during Bombyx mori larval development was analyzed using probes from a genomic DNA clone for 10.5 kb sericin mRNA. The 10.5 kb mRNA, the most abundant in the fifth instar, is not detected in the third feeding, fourth feeding and fourth moulting stages. It becomes detec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxo anion-supported organoactinides: the [(C5H5)3U(MW5O19)2]5- anions (M = Nb, Ta) and their thorium analogs [(C5H5)3Th(MW5O19)2]5-V. W. Day, W. G. Klemperer, and D. J. MaltbieCite this: Organometallics 1985, 4, 1, 104–111Publication Date (Print):January 1, 1985Publicati…
Based on experimental observations, a theoretical framework has been established to quantify the geometry of a three-dimensional braided fabric. Predictions of the strength of the fabric and composite were made using a geometric model.
The effect of hydrostatic pressure on the corrosion of aluminium in sea water oj pH 8·2 containing 7ppm dissolved oxygen has been investigated at 20°C. On increasing the pressure from 1 to 300 atm, the corrosion rate increased, an effect attributable to an increase in the rate of the anodic reaction while the cathodic…
Abstract It is observed that neither inspection of z values, consideration of near-neighbour coordination, nor chemical considerations show in all cases which atom occupies site 2 ( c I ) and which site 2 ( c II ) of the Cu 2 Sb tP 6 structure. Calculation of the Wirkungsbereiche by the Dirichlet construction shows in…
In this brief history, the author reviews the observations that led to his developing a nonionic contrast medium. Current knowledge suggested that if a water-soluble medium could be made isotonic to human plasma, it would cause less pain and toxicity than the ionic media then in use. The principles and design of such…
A recent study by Gross et al. showed the possibility of positive charging of dielectric materials by low energy electron irradiation. In this paper we model the charging process allowing us to predict the voltage builtup or decay and the corresponding charging currents under various initial potential conditions of th…
The xylose isomerase gene from Bacillus subtilis was cloned from a genomic BamH1 library by complementation of an isomerase defective Escherichia coli strain as previously described. The ATG initiation codon is preceded by a Shine-Dalgarno sequence and two hexamers being characteristic for the promoter region of Bacil…
The crystal structure of a small calcium-binding protein, the parvalbumin IIIf from Opsanus tau in which Tb was substituted for Ca, has been analysed by multiwavelength anomalous diffraction. Data at a resolution of 2.3 A were collected at three wavelengths near the L3 absorption edge of Tb (1.645-1.650 A), using the…
A « critical » degree of polydispersity is postulated beyond which liquid and crystalline states merge. For a system with a triangular particle-size distribution, the disappearance of the melting transition is estimated to occur at levels of just less than 30 % polydispersity.
La structure cristalline de la katoite [Ca3Al2(SiO4 (OH)8 ; a = 12,38 Å ; Z = 8 ; groupe spatial Ia3d] a été affinée jusqu'à R = 0,024. Si on compare les résultats de cet affinement avec ceux des termes de la série Ca3Al2(SiO4)3 — Ca3Al2(OH)12 (grossulaire, plazolite, composé synthétique sans silicium), on trouve un b…
I. Micromechanics of Failure of Reinforced Plastics (A.M. Skudra). II. Strength (Failure) Theories and their Experimental Correlation (R.E. Rowlands). III. Dynamics of Composites with Cracks (G.C. Sih). IV. The Influence of Time and Temperature on the Reinforced Plastic Strength (J.V. Suvorova). V. Methods of Static T…
The effects of seawater contaminants such as ammonium and sulfide ions and trimethylamine on the corrosion behavior of copper base alloys have been studied. Sulfide contamination causes a long-term change in the surface properties of the passive film formed on these alloys in uncontaminated seawater. The kinetics of o…
Abstract
Syntheses are described for pure paraffins having 102, 150,198, 246, and 390 carbon atoms; unlike lower homologues, all but the first show interesting properties in the solid state, bridging the gap between the chain-extended and the chain-folded modes of crystallisation typical of the lower n-paraffins and the linear…
Article Lattice Parameter Variation and Thermodynamics of Dihydride Formation in the Vanadium-Rich V—Ti—Fe/H2 System* was published on January 1, 1985 in the journal Zeitschrift für Physikalische Chemie (volume 145, issue 1-2).
Cellulosic derivatives form an interesting range of polymer liquid crystals. They belong to a class of mesophases in which the polymer chain is stiff or semiflexible and is chemically homogeneous. The cellulose backbone, a single-stranded homopolymer of β-linked 1,4-anhydroglucose units, contains three hydroxy groups…
Values for the order parameters < P2 > and < P4 > from polarized Raman measurements are reported for the homologous series of nematic alkylcyanobiphenyls. With increasing chain length a change of behaviour is observed from « low » < P4 >-values to higher values corresponding to the Maier-Saupe mean-field theory. In ad…