Materials Literature
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Reinterpretation of the neutron diffraction study of 2H–TaSe2 by Moncton, Axe and DiSalvo (1977) reveals an ambiguity in the sense of the displacements proposed for the commensurate superlattice structure. We attempt to resolve this ambiguity by electrostatic and short-range energy calculations of the phase dependence…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUNIFAC group contribution method for silicone compoundsMordechay Herskowitz and Moshe GottliebCite this: Ind. Eng. Chem. Process Des. Dev. 1981, 20, 2, 407–409Publication Date (Print):April 1, 1981Publication History Published online1 May 2002Published inissue 1 April 1981ht…
The ${c}_{55}$ elastic constant of K${\mathrm{H}}_{3}$${(\mathrm{S}\mathrm{e}{\mathrm{O}}_{3})}_{2}$ and K${\mathrm{D}}_{3}$${(\mathrm{S}\mathrm{e}{\mathrm{O}}_{3})}_{2}$ has been investigated by Brillouin scattering in the vicinity of the ferroelastic transition in free crystal and under applied uniaxial stress. At z…
Abstract The kinetic equation for the pyrolysis gasification reaction of isotactic and atactic polypropylenes has been established. The difference in tacticity of the samples does not much affect the kinetic parameters. The exponent a of the intensity function I F = T δ a (K·sec a ), concerning the severity of decompo…
A hyperscaling relation v″ + 2v┴ = 2 – α is examined for the nematic to smectic A transition of 4-octyloxy-4′-cyanobiphenyl (8OCB) and 4-octyl-4′-cyanobiphenyl (8CB). From the heat capacity results, 2-α is analyzed to be 1.84 ± 0.03 for 8OCB and 1.75 ± 0.02 for 8OCB. On the other hand v″ + 2v┴ is calculated from the r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization kinetics of sucrose in a CMSMPR evaporative crystallizerLeszek Sowul and Mary Anne Farrell EpsteinCite this: Ind. Eng. Chem. Process Des. Dev. 1981, 20, 2, 197–203Publication Date (Print):April 1, 1981Publication History Published online1 May 2002Published in…
An investigation of power frequency (50 Hz) surface partial discharges in dry air, using 21r/3 Rogowski profile electrodes in the low pressure range of 0.067 to 91.333 kPa, shows that for the discharges occurring symmetrically around the electrodes and just outside the uniform field region, the breakdown voltages are…
Magnetization measurements have been carried out to study various types of magnetism in degenerate magnetic semiconductors Sn 1- x (Me) x Te with different 3d transition metals Me=Cr, Fe, Co, and Ni. Of these impurities with x =1 at.%, only Cr and Fe act as ferromagnetic centers, while Co and Ni are magnetically ineff…
The characterization of radioactive corrosion products deposited on the internal surfaces of recirculation pipes was carried out to determine the deposited amounts and configurations. The test specimens were taken from the auxiliary pipes of the recirculation lines of Shimane Nuclear Power Plant after operation for ∼2…
Abstract The europium(II) orthoborate Eu3(BO3)2 is trigonal, space group R\bar3c, with a=9.069(1), c=12.542(2) Å and Z=6. The structure has been refined to R=0.082 for 259 observed reflections with isotropic thermal parameters. The borate contains isolated and planar triangle BO33− ions, the anions and Eu atoms being…
Abstract Tl 4 Ge 4 Se 10 crystallizes in space group C2/c with a = 15.602(6), b = 15.549(5), c = 9.052(3) Å, β - 107.10(3)° and Z = 4. The compound was prepared by fusion of a stoichiometric mixture of Tl 2 Se and GeSe 2 . The crystal structure is characterized by adamantane-like anions [Ge 4 Se 10 ] 4- and Tl + catio…
The nomenclature of replacement deposits is reviewed in terms of two processes, namely those involving the reaction between: (a) carbonate and siliceous rocks and (b) carbonate and unusual solutions, commonly, but not always, related to granitoids. ‘Wrigglite’ skarn is an example of a replacement deposit produced by p…
Abstract The new isotypic compounds BaGe 2 P 2 and BaGe 2 As 2 crystallize in the tetragonal system (P4 2 mc) with the following lattice constants: BaGe 2 P 2 : a = 761.8 ± 0.5 pm, c = 850.0 ± 0.5 pm, c/a = 1.12, BaGe 2 As 2 : a = 778.6 ± 0.5 pm, c = 866.4 ± 0.5 pm, c/a = 1.11. Fourbonded Ge atoms and twobonded P (As)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and ligand field parameters of some trigonally distorted tetrahedral cobalt(II) and nickel(II) complexesMalcolm Gerloch and Mark R. ManningCite this: Inorg. Chem. 1981, 20, 4, 1051–1056Publication Date (Print):April 1, 1981Publication History Published online1 May…
Abstract The rate of dissolution of phlogopite in an open system was measured at low temperature and pressure and at pH 3–5. The maximum dissolution rate was achieved by maintaining extremely low ionic concentrations in the solution using a cation-exchange resin (hydrogen form) as a trap for released cations. The resi…
Abstract Die erstmals dargestellten isotypen Verbindungen Ba 4 SiAs 4 , Ba 4 GeAs 4 , Sr 4 SiAs 4 und Sr 4 GeAs 4 kristallisieren kubisch, Raumgruppe P 4 3n, mit 8 Formeleinheiten in der Elementarzelle: In den Strukturen liegen isolierte, d.h. nur von Ba‐Ionen umgebene SiAs ‐ bzw. GeAs ‐Tetraeder vor. Die Verbindungen…
In Bacillus subtilis, conditions causing partial deprivation of guanine nucleotides initiated sporulation and caused the synthesis of citrate synthase, aconitase, and alpha-ketoglutarate dehydrogenase. Alpha-ketoglutarate dehydrogenase could also be induced by acetate, and the specific activity of this enzyme was elev…
An experimental investigation of the morphological stability of the planar solid-liquid interface was carried out in which, for the first time, all pertinent solidification parameters were determined quantitatively and the effect of convenction was evaluated. The microscopic growth rate and interface morphology were d…
Methods for measuring various storage moduli and damping factors of glassy polymers in the frequency range 10−2 to 10−7 Hz are critically reviewed. At frequencies between about 10−2 and 200 Hz, components of the complex tensile modulus E∗ and complex Poisson's ratio ν∗ have been determined at 21 °C for polymethyl meth…
Abstract The structure of a lepidolite-2 M 1 from Biskupice, Czechoslovakia, has been redetermined. Violations of systematic extinctions and of monoclinic equivalences plus the results of a second harmonic generation test indicate that the true symmetry most likely is C 1̄. The deviation of the data set from C 2/ c sy…