Materials Literature
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Abstract Simultaneous K exchange with Ca, Mg, and Na occurs in soils, but most of the published information is obtained from binary systems. The theoretical question of whether selectivity coefficients obtained in binary systems are valid for ternary systems has not yet been clarified; however, no significant differen…
The protonation and deprotonation equilibria of 5,10,15,20-tetra(p-sulphonatophenyl)porphyrin, H2tpps4–, as well as its complex formation with Mg2+, Zn2+ and Cu2+ metal ions have been investigated spectrophotometrically in a dimethyl sulphoxide (dmso)–water (80:20, v/v) solution. The following equilibrium constants ha…
The solubility and release kinetics of hydrogen in single‐crystal zirconia were investigated by the infusion–extraction method. Equilibration in hydrogen at pressures between 1.4 and 11 atm (0.14 and 1.1 MPa) and at temperatures from 1300° to 1600°C produced H/Zr ratios varying from 4 × 10 −5 to 1.3 × 10 −4 . Dissolut…
Contamination flashover is the major cause of insulator failure in the eastern region of Saudi Arabia. Saudi Consolidated Electric Company in the eastern region (SCECO East) has adopted several countermeasures such as increasing the creepage distance and using insulators of different shapes and materials, including re…
Collagen constitutes more than a quarter of the total protein in animals 1 . It is a fibrous protein conferring many important characteristics on the connective tissues of the body, in particular mechanical properties such as tensile strength and biological properties such as the activation of the blood-clotting casca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility of polyamide blends. 1. Molecular modeling of poly(n-methyleneisophthalamide)-poly(meta-phenyleneisophthalamide) blendsJosee Brisson and Brigitte BreaultCite this: Macromolecules 1991, 24, 2, 495–504Publication Date (Print):January 1, 1991Publication History Publ…
Article Studies on the Genera Gyrosigma and Pleurosigma (Bacillariophyceae). The Typus Generis of Pleurosigma, some Presumed Varieties and Imitative Species was published on January 1, 1991 in the journal Botanica Marina (volume 34, issue 6).
Mechanical properties were studied by tensile test of a Ti-15V-3Cr-3Sn-3Al alloy obtained by duplex-aging after cold-swaging, i.e. aging at high temperatures followed by re-aging at a lower temperature. Combinations of short-time aging at 823, 873 and 923 K and re-aging at 673 K have greatly improved the strength-duct…
Results of an in situ FTIR study are reported for the reaction of CO and O2 over Rh/Al2O3. Particular attention has been paid to morphology changes occurring during the reaction. At low O2 : CO ratios, agglomeration of dispersed Rh occurs, leading to formation of Rh clusters with linear carbonyl adsorption sites, wher…
For boron carbide the limit of the homogeneity range at the carbon‐rich side yet has not been firmly established. During the last twenty years carbon‐rich limiting compositions have been reported corresponding to B4.3C (i.e., ‘‘B13C3’’), B4.0C (i.e., ‘‘B12C3’’) and B3.6C (i.e., ‘‘B11C3’’). By means of quantitative EPM…
Abstract Bei dem Versuch, RbLi 3 [SiO 4 ] darzustellen, entstanden erstmals Einkristalle von RbLi 5 {Li[SiO 4 ]} 2 durch Tempern inniger Gemenge der binären Oxide RbO 0,68 , LiO 0,5 und SiO 2 [Rb:Li:Si = 1,1:3,0:1,0; 600°C; 21 d] in fest verschlossenen Ni‐Bömbchen. Das neue „Lithosilicat”︁ kristallisiert monoklin (Rau…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic polymerization of monomers containing functional groups. 2. Anionic living polymerization of 4-cyanostyreneTakashi Ishizone, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1991, 24, 2, 625–626Publication Date (Print):January 1, 1991Publication History Pub…
Abstract By means of X‐ray investigations the structure of the S E and S A ‐phases of the title compounds has been studied. The lattice parameters of the orthorhombic S E structure are given. The thickness of the smectic layers is nearly the same in the S E and S A phases and agrees well with the length of the molecul…
The homologous series of 2,3,6,7,10,11,14,15-octaalkyloxytetrabenzo[a,d,g,j]cyclododecatetraenes (CTTV-n) containing n= 4–15 methylenic units in the alkyloxy substituents has been prepared both by alkylation of octhydroxytetrabenzocyclododecatetraenes (CTTV-OH), and by cyclotetramerization of the corresponding 3,4-(di…
Elastic scattering of relativistic electrons and positrons by atoms is considered in the framework of the static field approximation. The scattering field is expressed as a sum of Yukawa terms to allow the use of various approximations. Accurate phase shifts have been computed by combining B\"uhring's power-series met…
The thermal decomposition of copper(II) oxalate has been studied under vacuum using a constant-volume apparatus and a microbalance; and under dynamic atmospheres of air, nitrogen and oxygen using thermogravimetry and differential scanning calorimetry. The decomposition was found to proceed to copper metal under an ine…
Pronounced antimony surface enrichment on a silica gel surface grafted with Sb2O5 is evident after adsorption of Fe3–, and the surface new phase, presumably FeSbO4, is thermally very stable.
Abstract
Free liquid surfaces in equilibrium are described by the Laplace capillary equation with suitable boundary conditions generally given in terms of the contact angle. By a fortuitous formulation in the axisymmetric case, the second order ordinary differential equation can be reduced to a pair of coupled first-order equa…
Two methods for the measurement of the electron emission currents and the secondary electron yields for electron-irradiated dielectrics are discussed. Experimental results indicate that the dynamic measurement method for the secondary emission yield delta provides yield curves that are significantly lower than those o…