Materials Literature
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A distinctive and widespread belemnite-bearing shale of the Tethyan region is well exposed in the Trans-Indus Salt Range as the Chichali Formation, where it contains two workable ironstone seams. Facies analysis indicates a pronounced deepening in the Upper Oxfordian and Kimmeridgian followed by two regressive cycles…
The “smectic D ” mesophase has been described in the past as a cubic arrangement of rods. In the present work, a molecular model, in which rods are formed by the stacking of small groups of molecules lying side by side, is proposed. The junction of the rods occurs through a cholestericlike twist of the molecules. A po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental and theoretical study of the nascent photoredox behavior of the aqueous hexachloroplatinate(IV) ionA. Goursot, A. D. Kirk, W. L. Waltz, G. B. Porter, and D. K. SharmaCite this: Inorg. Chem. 1987, 26, 1, 14–18Publication Date (Print):January 1, 1987Publication Hi…
The structure and phase diagram of Ti1−yVyHx (0≤y≤1.0, 0≤x≤2.0) have been studied by X-ray diffractometry at room temperature. The following crystallographic phases and their mixtures are identified and their phase boundaries are determined: α(hcp), β(bcc), γ(fcc), δ(fct) and ε(bct). One notable feature of this phase…
Serrated flow in Inconel 625 was investigated in solution treated tensile specimens at strain rates between 4.17×10−5 s−1 and 4.17×10−3 s−1 at temperatures between 498 K and 923 K.The strain for the onset of Type A serrations and that for the gradual development of Type B serrations were able to be related, by the sam…
The permittivity and dielectric loss of an acetamide–sodium thiocyanate mixture have been measured over a wide frequency interval, from 10–1 to 108 Hz. The observed dielectric dispersions have been interpreted on the basis of a polymeric model previously proposed. The dipole moment of the acetamide molecule as a funct…
The electrical properties of CeO2–UO2 solid solutions are examined as a function of temperature, oxygen partial pressure and Ce/U ratio. A defect model is presented for this system which illustrates the manner in which CeO2- and UO2-rich solid solutions can be induced to cross over the stoichiometric composition to ox…
It is generally known that hydrophobic lubricants such as magnesium stearate can have a strong negative effect on the binding properties of directly compressible filler-binders. It was found that the decrease in binding forces is not only dependent on the tablet ingredients and the lubricant concentration used, but es…
A recent reanalysis of enthalpy data for UO2 using a local smoothing technique has revealed a weak sigmoidal structure in the data and a corresponding specific heat peak, indicating the existence of a Bredig transition occurring at ca. 2610 K (ca. 0.84Tm). The same smoother applied to ThO2, PuO2 and the mixed oxides (…
The cubic phase of the lyotropic system hexa-ethyleneglycol mono n-dodecyl ether (C12EO6 )/water is studied by small angle X-ray scattering, at the synchrotron radiation facility of LURE. The indexation of 15 Bragg reflections is strongly in favor of a body-centred cubic structure with space group Ia3d. The presence o…
Nous avons étudié les dislocations de plagioclases calciques (An 68-70) déformés dans des conditions métamorphiques de faciès amphibolite rétrograde. Quatre systèmes de glissement ont été identifiés : [001] (010), [100] (001), 1/2[1-11] (011), [101] (101). Le système [001] (010) domine la microstructure avec des boucl…
Protodolomite was synthesized from sea water containing dioxane by adding 0.4M Na2CO3 solution at 40°C. The presence of dioxane in moderate concentrations (3 to 8vol%) in a parent solution favors the formation of CaCO3(calcite)-MgCO3 solid solution. Optimal condition for protodolomite synthesis was established. The mi…
An orthopyroxene–sillimanite association occurs in Al–Mg rich granulites within Archaean aluminous metapelites at In Hibaou (NW Hoggar). Sapphirine is characteristically present in those rocks as a reaction product of a high pressure mineral association. Other reaction products include cordierite and a second generati…
Two conjugated homologues of thiophene–7,7,8,8-tetracyanoquinodimethane (TCNQ) have been prepared, which form highly conductive complexes with typical electron donors such as 2,2′,5,5′- tetrathiafulvalene (TTF) or 5,6,11,12-tetrathiatetracene (TTT); these complexes have extensive conjugation.
The photocatalytic dehydrogenation of liquid methanol, ethanol, propan-1-ol and propan-2-ol has been investigated using platinized anatase and 366 nm u.v. radiation over the range 278–303 K. Activities and activation energies for carbonyl-compound formation were effectively identical for the four alcohols on Pt(0.5)/T…
We reviewed clinical data and quantitative muscle biopsy data from infants with hypotonia and developmental delay who had relatively small type 1 muscle fibers (fiber size disproportion; FSD). Study material consisted of 49 thigh muscle specimens from 37 patients, 1 week to 11.5 years old, who had FSD diagnosed betwee…
High-field magnetisation measurements have been performed on single-crystalline samples of hexagonal Ho 2 Co 17 , Ho 2 Fe 17 and Ho 2 Co 14 Fe 3 in fields up to 40 T. In this field interval the magnetisation curves of Ho 2 Co 17 and Ho 2 Co 14 Fe 3 exhibit pronounced magnetic transitions in the hexagonal plane. The ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of chemical waves in the acidic bromate-malonic acid-tris(bipyridine)ruthenium(2+) system in comparison with the ferroin systemL. Kuhnert and H. J. KrugCite this: J. Phys. Chem. 1987, 91, 3, 730–733Publication Date (Print):January 1, 1987Publication History Publishe…
We present a Flory approximation for the conformation of semi-flexible linear and branched polymers in the extremely stiff limit. We show that the upper marginal dimension dc for the excluded volume effect is in general reduced in the stiff limit. In particular, for a linear chain in a good solvent we find dc = 2 in a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZero-field magnetic susceptibility study of the magnetic phase transition in the two-dimensional ionic ferromagnet bis(benzylammonium) tetrabromochromate(II), (C6H5CH2NH3)2CrBr4Carlo Bellitto, Pasquale Filaci, and Salvatore PatrizioCite this: Inorg. Chem. 1987, 26, 1, 191–19…