Materials Literature
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The properties of two soil groups widely found in Java and Sumatra are studied. The two groups, closely related, are known pedologically as latosols and andosols, and are formed under tropical weathering conditions from volcanic parent material. The latosols are reddish in colour and are found at altitudes up to about…
Abstract The effects of crystallinity, orientation and degree of polymerization on the vacuum pyrolysis of cellulose have been investigated. Natural, modified and manmade celluloses were characterized and the kinetics of their pyrolysis at 251°C studied. The high‐temperature pyrolysis of these samples was also investi…
Inositol-independent (inos(+)) revertants of Neurospora induced in inositol-requiring mutants by treatment with wild-type DNA in previous studies were found to be stable and to grow well in the absence of inositol. Genetic data presented in this paper show that a major proportion of these induced revertants rarely tra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of low-spin cobalt porphyrins. I. Structure and bonding in a nitrosylcobalt porphyrin and their bearing on one rational model for the oxygenated protohemeW. Robert. Scheidt and J. L. HoardCite this: J. Am. Chem. Soc. 1973, 95, 25, 8281–8288Publication Date (P…
The power-law and constant-loss theories of secondary electron emission have been modified to include the effects of secondary scattering within the solid. For power-law exponent values of 1.35, 1.66, and 2.00, the scattering effects reduced penetration depths at maximum yield by almost a factor of 2 and decreased the…
A new magnetic symmetry of the rare-earth orthochromites and orthoferrites ($\mathrm{RM}{\mathrm{O}}_{3}$) below the second N\'eel temperature due to the reordering of the rare-earth spins is proposed. It is shown that the magnetic symmetry group is lowered to the subgroup of index two, thereby keeping the unit cell i…
Thermal decomposition of silicon diimide, Si(NH) 2 , in vacuum resulted in very‐high‐purity, fine‐particle‐size, amorphous Si 3 N 4 powders. The amorphous powder was isothermally aged at 50° to 100° intervals from 1000° to 1500°C for phase identification. Examination of ir spectra and X‐ray diffraction patterns indica…
In recent years a wide variety of methods has been used to describe the polarization characteristics of ultra low frequency (10−3 to 1 Hz) magnetic fields. This paper gives a more complete outline of some of the descriptions derived from the spectral matrices of n-variate stochastic processes. The matrices are expande…
(1973). Quantum properties of surface space-charge layers. C R C Critical Reviews in Solid State Sciences: Vol. 4, No. 1-4, pp. 499-514.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spectroscopy for chemical analysis of nickel compoundsC. A. Tolman, W. M. Riggs, W. J. Linn, C. M. King, and R. C. WendtCite this: Inorg. Chem. 1973, 12, 12, 2770–2778Publication Date (Print):December 1, 1973Publication History Published online1 May 2002Published in…
Abstract Aqueous solutions of poly(vinyl alcohol) were submitted to varying doses of electron beam irradiation. By modification of the classical Flory‐Huggins equations appropriate to the initial state of solution of the polymer, the molecular weight between crosslinks, M c , was calculated as a function of radiation…
The existence of depolarization fields in thin ferroelectric films is experimentally demonstrated by investigating an unconventional electrode-ferroelectric configuration consisting of a triglycine sulphate (TGS) film sandwiched between a gold and a doped-silicon electrode. Due to nonidentical electrodes, the compensa…
The phonon dispersion relations of ZrC, NbC, HfC, TaC, and UC are investigated using a phenomenological-model theory. For the transition-metal carbides, a shell model with a free-electron screening is used to describe the over-all shape of the phonon curves. The results strongly support the "covalent model," where the…
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