Materials Literature
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A wide variety of polymers and copolymers of 1,3-dienes have been modified at low temperatures via the ene reaction with 4-substituted l,2,4-triazoline-3,5-diones. The resulting modified polymers were characterized via infrared spectroscopy, nuclear magnetic resonance, intrinsic viscosity, gel-permeation chromatograph…
Silk proteins were solubilized from cocoons with ethylenediamine/cupric hydroxide solution. A series of polymers of the smallest component, detected by polyacrylamide-gel electrophoresis, could be converted into the smallest component by reduction and aminoethylation. Fibroin and sericin fractions were separated by pr…
Mn1-x-yAlxCyforms a ferromagnetic metastable tetragonal τ-phase in the composition range0.42 \leq x \leq 0.47and0 \leq y \leq 0.021. Its high unaxial magnetocrystalline anisotropy makes it an interesting candidate for a permanent magnet. In order to investigate the kinetics of the transformations which occur in this s…
Abstract The K fertilization requirement for corn ( Zea mays L.) frequently is overestimated by soil test procedures for Atlantic Coastal Plain soils having sandy Ap horizons and high K concentrations in clayey subsoil. It seemed probable that the lack of response could reflect availability of subsoil K. This field an…
Liquid crystal alignment on thin films obliquely deposited by electron beam evaporation of SiO2 is reported. Films deposited at a glancing angle of 5° give high tilt alignment ?45°, while increasing the deposition angle to 30° gives zero tilt alignment. Scanning electron microscope (SEM) pictures relate surface topogr…
Turning experiments have been carried out on a low carbon iron using steel tools of different side rake face geometry. Temperature distributions have been determined using a recently developed metallographic method. It has been found that when using tools which have a controlled chip-tool contact length of 0.5 mm. the…
Magnetoelectric effect was observed in ZnCr 2 Se 4 below 20 K, in the state of screw spin structure. Magnetic field dependence of the effect at 4.2 K was qualitatively interpreted by the appearance of Dzyaloshinski interaction, when the field was applied along [001] or k 0 , the wave vector representing the screw stru…
An incommensurate phase was found in {N(CH 3 ) 4 } 2 CuCl 4 in the temperature range of 20.5°C∼27°C where a satellite reflection was observed by neutron diffraction at (2,0, 1-(1/3 -δ)) with δ-0.007. The satellite exists just at the commensurate position (2, 0, 1-1/3) between 20.5°C and -11°C in the monoclinic frame w…
Thalassiosira oestrupii (Ostenfeld) Hasle was studied from the southern Indian Ocean, Wed‐dell Sea, and northern Atlantic Ocean. It has the longer extension of the strutted process inwards, with three small columnar supports. A single strutted process near the central areola is 2‐3 areolae away from the single labiate…
The miscibility gap of an Fe-Cr-Co system is further examined by monitoring the microstructures and the magnetic properties of the alloys. It is shown that the shape of the miscibility gap is not parabolic but of a peculiar shape, protruding to the Fe side along the Curie temperature. The part of the protrusion of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange interaction in roof-shaped hydroxo-bridged copper(II) dimersMarie France Charlot, Olivier Kahn, Simone Jeannin, and Yves JeanninCite this: Inorg. Chem. 1980, 19, 5, 1410–1411Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published…
On the basis of the characteristic enthalpy changes associated with glass transformation, the glass transition (Tg) in gelatin can be detected readily, in addition to the helix-to-coiltransition, by difTerential scanning calorimetry, and the effects of water content on these transitions can be measured directly. The t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-Phase Oxidation of Phenol in a Rotating Catalytic Basket ReactorHideki Ohta, Shigeo Goto, and Hideo TeshimaCite this: Ind. Eng. Chem. Fundamen. 1980, 19, 2, 180–185Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 Ma…
In 0.25 M potassium acetate (pH 5.2).
The deformation of an ultrafine-grained aluminium alloy has been examined in tension and torsion. At grain sizes below about 3 μm the alloy exhibits inhomogeneous yielding but this is absent at larger grain sizes. If the lower yield strength values are plotted versus grain size the strengths are inversely dependent on…
The spectrum of U3+:LaCl3 has been analyzed; 53 crystal states of electronic origin have been identified, many of them accompanied by extensive vibronic sidebands having a recognizable structure similar to that for lanthanide-doped LaCl3. Seventeen energy level parameters were varied simultaneously in a least-squares…
We report measurements of the tilt angle $\ensuremath{\Phi}$ and the planar spacing ${d}_{C}$ near the second-order $\mathrm{Sm}C\ensuremath{-}\mathrm{Sm}A$ transition in $4\ensuremath{-}n\ensuremath{-}\mathrm{pentyl}\ensuremath{-}\mathrm{phenylthiol}\ensuremath{-}{4}^{\ensuremath{'}}\ensuremath{-}n\ensuremath{-}\math…
The spin dynamics of the transition-metal ferromagnets nickel and iron are investigated within the framework of the itinerant theory of magnetism. The theory is developed in terms of a generalized random-phase approximation which incorporates the band and wave-vector dependence of relevant interaction matrix elements.…
The synthesis and properties of one-dimensional conductors are of topical interest. It has now proved possible to synthesize (1) and a polymer (2), in which PcFe and pyrazine groups alternate. The physical properties of (2) indicate extensive electron delocalization over the pyrazine bridges.
The major cytotoxic activity of crude extracts of Nectandra rigida Nees is due to dehydrodiisoeugenol,the sample isolated being slightly enriched in the dextrorotatory enantiomer. Galgravin and two new tetrahydrofuranoid lignans, nectandrin A and nectandrin B, were also isolated and characterized along with small quan…