Materials Literature
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Determination de la structure modulee incommensurablement de TaTe 4 par diffraction RX sur la base d'une surmaille 2a×2a×3c. Le groupe d'espace de la sousmaille est P4/mcc, celui de la surmaille P4/ncc. Affinement de la structure jusqu'a 0,064. La structure se caracterise par des chaines TaTe 4 le long de l'axe c. Ces…
Abstract Previous work by a number of researchers has noted the presence of anhydride during the imidization step of polyimide polymer processing from diester‐diacids and diamines. This has been often, and incorrectly, dismissed as being due to the reversion of the intermediate amide‐acid. Comparison of the relative r…
Abstract Aqueous solutions of the salt sodium polytungstate can be prepared with varying densities up to 3.1 g/cm 3 . The salt is nontoxic and it is recommended as a substitute for the hazardous halogenated hydrocarbons, tetrabromoethane and bromoform, customarily used in geological laboratories to perform light/heavy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA copper(II) dope as a detector for the high-spin .tautm. low-spin transition in the two-dimensional compound [trans-bis(thiocyanato)bis(4,4'-bi-1,2,4-triazole)iron] hydrateWim Vreugdenhil, Jaap G. Haasnoot, Olivier Kahn, Pierre Thuery, and Jan ReedijkCite this: J. Am. Chem.…
Abstract Core cuttings from numerous wells traversing Oligocene through Recent sediments of the Texas Gulf Coast were examined with a scanning electron microscope using the back-scattered electron imaging mode (BSE) to ascertain diagenetic changes in clays and associated minerals of mudrocks and of adjacent sandstones…
V 2 O 3 was incorporated into polymer matrices to produce composite materials with low room‐temperature resistivities and sizable positive temperature coefficient (PTC) resistance effects. In addition, a negative temperature coefficient effect, associated with the semiconductor‐to‐metal phase transition in V 2 O 3 , w…
La phase haute temperature (T>83,5 K) du benzile cristallise dans le systeme rhomboedrique avec le groupe d'espace P3 1 21. Affinement de la structure jusqu'a 0,043 (T=294 K) et 0,041 (T=100 K). La phase basse temperature cristallise dans le systeme monoclinique avec le groupe d'espace P2 1 . Affinement jusqu'a 0,066…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical reactivity of manganese(II) porphyrins. Effects of dioxygen, benzoic anhydride, and axial ligandsS. E. Creager and Royce W. MurrayCite this: Inorg. Chem. 1987, 26, 16, 2612–2618Publication Date (Print):August 1, 1987Publication History Published online1 May 2…
An investigation of the electrochemical noise generation during the stress corrosion cracking (SCC) of alpha-brass was conducted in Mattsson1 solution (ammoniacal copper sulfate solution) of pH 7.2 under free corrosion potential. The electrochemical noise was observed as spontaneous potential fluctuations. The analysi…
Abstract Phase transition of water sorbed in regenerated cellulose (II), for water contents ranging from 0 to 1,0 (water/dry cellulose, g/g), was investigated by differential scanning calorimetry (DSC). It was found that the amount of water bound to each glucose unit is ca. 3 mol considering that water diffuses only i…
The thermal expansion and magnetic susceptibility have been measured for Y(Mn 1-x Al x ) 2 pseudobinary Laves phase intermetallic compounds. A large volume change at T N and a remarkable enhancement of the thermal expansion coefficient above T N were observed in YMn 2 . The substitution of Al for Mn makes these anomal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCobalt mixed spinels as catalysts for the synthesis of hydrocarbonsGiuseppe Fornasari, Stefano Gusi, Ferruccio Trifiro, and Angelo VaccariCite this: Ind. Eng. Chem. Res. 1987, 26, 8, 1500–1505Publication Date (Print):August 1, 1987Publication History Published online1 May 20…
The liquid structure of dimethyl sulfoxide (DMSO) was investigated by X-ray diffraction. The intramolecular structure parameters were obtained as follows: S = 0 150(1) pm, C - S 180(1) pm, nonbonding C · · · O 267(4) pm and C · · · C 271 (7) pm. It is suggested that the molecular arrangement in the liquid state is sim…
A numerical model is developed for calculating the transformation of irregular waves due to refraction, diffraction and breaking. The model is based on a parabolic equation which is derived from the mild slope equation1) with an additional term of energy dissipation.In the present model, irregular waves are treated as…
The dissolution kinetics of crystalline and amorphous silica were studied as a function of time, temperature, concentration of HF, concentration of HC1, and crystallographic orientation. The results indicate that dissolution is a surface reaction‐controlled process. The dissolution rate depends strongly on HF concentr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropolyanions as nucleophiles. 1. Synthesis, characterization, and reactions of Keggin- and Dawson-type tungstostannates(II)Gayatri S. Chorghade and Michael T. PopeCite this: J. Am. Chem. Soc. 1987, 109, 17, 5134–5138Publication Date (Print):August 1, 1987Publication Hist…
Dedifferentiated chick embryo chondrocytes (Castagnola, P., G. Moro, F. Descalzi-Cancedda, and R. Cancedda, 1986, J. Cell Biol., 102:2310-2317), when transferred to suspension culture on agarose-coated dishes in the presence of ascorbic acid, aggregate and remain clustered. With time in culture, clusters grow in size…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of the Pariser-Parr-Pople approximation to obtain practically useful predictions for electronic spectral properties of conducting polymersPaul M. Lahti, Jan Obrzut, and Frank E. KaraszCite this: Macromolecules 1987, 20, 8, 2023–2026Publication Date (Print):August 1, 1987…
The luminescence properties of Ce 3+ ‐ and Tb 3+ ‐activated and of Tb 3+ ‐activated are reported. It is shown that activated with Tb 3+ is an excellent phosphor both under UV and x‐ray excitation. In both types of compounds there are two different Ln 3+ sites available for the activator ions, Ce 3+ and Tb 3+ . The res…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly reactive magnesium and its application to organic synthesesTimothy P. Burns and Reuben D. RiekeCite this: J. Org. Chem. 1987, 52, 16, 3674–3680Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://p…