Materials Literature
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The population dynamics of dominant planktonic diatoms during the eutrophication of Mondsee, Austria, are described by analysis of a 36 cm in situ frozen sediment core from the profundal region using tape peel preparation techniques; the results are compared with data from plankton investigations. The development of M…
Temperature dependence of magnetization and anisotropy field of Nd2(Fe1-xMx)14B, where M = Al(0 \leq x \leq 0.10), Cr(x=0.05), Mn(x=0.05) and Co(0 \leq x \leq 1), have been measured on single crystal samples grown by the floating zone melting technique. Substitution with M for Fe in Nd2Fe14B has been found to shift th…
The self-consistent-field multiple-scattering X\ensuremath{\alpha} method has been used to calculate the electronic structures of substitutional chromium and manganese ions (valence states investigated: from +2 to +6) in cubic ${\mathrm{BaTiO}}_{3}$. The energy levels of the 3d states are provided, compared to the val…
Abstract An aromatic, diether‐linked phthalonitrile resin, prepared from 4,4′‐bis(3,4‐dicyanophenoxy)biphenyl, can be converted into an environmentally stable, highly conductive material by thermal means. The conductivity of the pyrolyzed polymer can be varied and controlled as a function of both the pyrolytic tempera…
The following sixteen reference patterns of boride, silicide, nitride and oxide ceramics represent the second group of reference patterns measured at the National Bureau of Standards under the project “High Quality Reference Patterns and Total Digital Powder Patterns of Technologically Important Ceramic Phases”. Inclu…
Maghemite in Darling Range lateritic duricrust ranges from 2 to 10% in abundance, contains less than 5 mole % Al and occurs as aggregates of very small ~ 150 A subrounded platy crystals. Corundum is also present, ranging from 1 to 3.5% in abundance, and it contains less than 3 mole % Fe and occurs as rounded (~250 A)…
A model of hydrogen trapping and retrapping in hydrogen-charged iron is suggested and support for it provided by the thermal analysis technique. The theory, which can pre-estimate and describe the behaviour of supersaturated hydrogen in interstitial sites of a normal lattice, considers the variation of the equilibrium…
Two new glass systems based on a range of lead‐indium phosphate and lead‐scandium phosphate compositions have been developed and characterized. These glasses have a relatively high index of refraction ( n = 1.75 to 1.83) in the visible region and exhibit moderate dispersion (Abbe number ∼30). The ultraviolet absorptio…
Abstract We have developed a flash radiometry technique for the determination of the thermal diffusivity of polymer films that consists of flashing a laser pulse on the front surface of the sample and monitoring the thermal radiation from the rear surface as a function of time using an infrared detector. This method i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal stability of isocyanate-based polymers. 2. Kinetics of the thermal dissociation of model urethane, oxazolidone, and isocyanurate block copolymersP. I. Kordomenos, J. E. Kresta, and K. C. FrischCite this: Macromolecules 1987, 20, 9, 2077–2083Publication Date (Print):S…
Stable β-Ga2O3 and α-Ga2O3:Co thin films were grown on thoroughly cleaned borosilicate glass plates by the spray pyrolysis method. The substrate temperature during growth was maintained at 350 °C and the film was then annealed in air at 350 °C for 30 min. The optical energy gaps for these films at 295 K was given as 4…
Abstract The mechanisms of hydrolysis and condensation of a silane coupling agent, γ‐methacrylo‐xypropyltrimetoxysilane (γ‐MPTS) were investigated by the use of both 13 C and 29 Si nuclear magnetic resonance (NMR) spectroscopies. The NMR peaks of the hydrolyzed monomer and condensed polymer were assigned readily. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic viscoelastic properties of ABS polymers in the molten state. 5. Effect of grafting degreeYuji AokiCite this: Macromolecules 1987, 20, 9, 2208–2213Publication Date (Print):September 1, 1987Publication History Published online1 May 2002Published inissue 1 September 198…
This paper describes the theoretical analysis of Barkhausen noises initiated in two different microstructures of carbon steels, being consisted of ferrite grains with or without dispersed cementites. The Barkhausen noise is generally evaluated by its RMS value, which is the sum of induced voltage pulses caused by the…
ABSTRACT This paper evaluates the utilisation of space by epibenthic diatom cells, as a response to environmental variations. The aggregation pattern of five species of epibenthic diatoms was quantified and compared to provide evidence for the significance of cell motility as an adaptive mechanism for space occupation…
A distorted dodecahedral array of eight O atoms surround the Gd3⊕ ion in 2, the first stable adduct of an organic radical (1) and a lanthanoid ion. From the temperature-dependence of the magnetic susceptibility of 2 it can be concluded that there is a weak ferromagnetic interaction between GdIII and the unpaired elect…
Cubic BN thin films are formed in RF discharge in B 2 H 6 and N 2 at low pressures under a magnetic field to confine the plasma, for negatively self-biased substrate electrodes. Ion bombardment on the growing surface is suggested to play an important role in the formation of cubic BN. The deposited films are character…
When the sintering of a polycrystalline body is analyzed by coupling the change in interface energies and the change in total volume of the polycrystal, it is discovered that the sintering pressure is a sum of two terms, one deriving from the surface curvature of the pores and the other depending on the size of the gr…
Abstract The cure of pyromellitic dianhydride–oxydianiline polyamic acid is compared with that of a model compound, diphenylcarbamido–dicarboxy–benzene, both having been synthesized in 1‐methyl‐2‐pyrrolidinone (NMP). Laser interferometry and thermogravimetric analysis showed that, analog to the diamic acid model compo…
The clustering of carbon in the detonation regime is studied with the assumption of a diffusion-limited clustering process. The diffusion constants are determined from modified Enskog theory and the Stokes–Einstein relation. With the size dependence of the cluster energy treated with a surface term, the energy differe…