Materials Literature
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Relations between the glass transition, the flow, and the liquidus temperatures were studied in order to determine compositions of silica‐rich oxide materials for planarization layers in very large scale integrated technology. Thus, the Si 1 / 2 O , B 2 / 3 O , P 2 / 5 O , Ge 1 / 2 O , and AS 2 / 3 O binary phase diag…
The 4f electrons of lanthanides yield three types of transitions: (i) Internal 4f-4f transitions which give rise to sharp, narrow bands of comparatively weak intensities which are Laporte forbidden. (ii) Allowed 4fn−4fn-1 (n – l)d, which are relatively broad and intense. (iii) Broad and often intense 4fn−λ−1 fn+1 elec…
The flux density B for a magnetic field H in a soft magnetic material is given by the derivatives of the stored coenergy density with respect to the components of H. Any single-valued nonlinear tensor permeability may therefore be stored compactly, and retrieved with little computation, by storing its coenergy density…
An empirical tight-binding framework and the recursion method are used to calculate some electronic properties of II-VI semiconductor nanocrystals. First, the ground-state energy of the exciton is calculated. Results are given for six different II-VI compounds. A simple evaluation of the optical absorption peak of the…
A simple monitoring technique has been used to derive information on Hoc growth and break-up in agitated clay suspensions of quite high solids content (1 and 3% w/v), under the influence of a high molecular weight cationic polymer. For fairly low polymer dosages and high mixing speeds floe growth in the 3% suspensions…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon-29 MAS NMR investigation of the sodium oxide-alumina-silica glassesHideki Maekawa, Takashi Maekawa, Katsuyuki Kawamura, and Toshio YokokawaCite this: J. Phys. Chem. 1991, 95, 18, 6822–6827Publication Date (Print):September 1, 1991Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of shear on miscible polymer blends: in situ fluorescence studiesS. Mani, M. F. Malone, Henning H. Winter, J. L. Halary, and L. MonnerieCite this: Macromolecules 1991, 24, 19, 5451–5458Publication Date (Print):September 1, 1991Publication History Published online1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal properties and stereoregularity of poly(3-hydroxybutyrate) prepared from optically active .beta.-butyrolactone with a zinc-based catalystNaoki Tanahashi and Yoshiharu DoiCite this: Macromolecules 1991, 24, 20, 5732–5733Publication Date (Print):September 1, 1991Public…
When a ceramic‐to‐metal brazed joint is fabricated, residual stresses develop as the material is cooled from the brazing temperature to room temperature. These residual stresses reduce the strength of the brazed joint, and in some cases lead to catastrophic failure at or near an interface, during the brazing process i…
The liquid-crystalline phase behavior of a fluid of biaxial hard particles (spheroplatelets) is studied using a scaled particle calculation of the fluid configurational entropy combined with a cell description of translational order. If translational ordering is ignored, the density versus particle biaxiality phase di…
The synthesis of novel liquid-crystalline heteroaromatic compounds incorporating the five membered 1,3,4-oxadiazole ring is described. Due to the bent molecular structure of the oxadiazole ring their mesophase stability is low if the heterocyclic ring occupies a central position, but it is increased if this ring is sh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAluminum(III) speciation with acetate and oxalate. A potentiometric and aluminum-27 NMR studyFabien Thomas, Armand Masion, Jean Yves Bottero, James Rouiller, Francine Genevrier, and Denis BoudotCite this: Environ. Sci. Technol. 1991, 25, 9, 1553–1559Publication Date (Print):…
Abstract Forty‐four soil clays and four reference phyllosilicate clays were used to establish qualitative and quantitative relationships between clay mineral characteristics and K fixation. The soil clays were obtained from Vertisols, Vertic Mollisols, Haploxerolls, Xerochrepts, and a Palexeralf, from three semiarid r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal synthesis and structural characteristics of two layered mixed-valence vanadyl phosphate hydrates Na0.50VOPO4.2.0.H2O and K0.50VOPO4.1.5.H2OS. L. Wang, H. Y. Kang, C. Y. Cheng, and K. H. LiiCite this: Inorg. Chem. 1991, 30, 18, 3496–3499Publication Date (Print):S…
Fabric drape of a number of fabrics was measured using a digital Drape Tester and was found to be significantly correlated with the subjective evaluation of drape. Fabrics were draped on two different-sized pedestal plates, and differences in draping behavior between plates and among fabrics were determined Composite…
Abstract The three isomeric 1,4:3,6‐dianhydroalditols with D ‐ gluco ‐ ( 2 ), D ‐ manno ‐ ( 11 ) and L ‐ ido ( 17 ) configuration and both 1,4‐anhydroalditols with threo ( 22 ) and erythro ( 27 ) configuration were efficiently transformed into the corresponding diamino derivatives. Interfacial polycondensation of thes…
It is demonstrated that it is possible to grow thin alumina films on an alumina substrate by the sequential adsorption of water and trimethyl aluminum (TMA) both on high-surface-area alumina and in ultrahigh vacuum (UHV) at room temperature. The presence of the resulting layer is demonstrated on high surface-area subs…
Extravasation of intravenously injected contrast medium is a well-known complication of radiologic procedures. Records from a 27-month period were reviewed of 28 patients in whom extravasation of nonionic contrast medium occurred during computed tomographic (CT) scanning. Extravasated amounts ranged from 3 mL in an in…
The reflection and transmission properties of finely divided fractal layers are investigated and characterized. The results for electromagnetic or optical waves normally incident upon generalized Cantor bar fractal multilayers are found for various fractal dimensions and stages of growth. A new exact self-similar algo…
Abstract Three poly(vinylidene fluoride) whole polymers were fractionated according to their head‐to‐head concentrations. Their melting temperatures and fusion properties were studied. Although small but significant differences were found among the fractions obtained from a given parent polymer, a wide range in chain…