Materials Literature
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Electromigration testing of integrated circuit metallizations requires the use of accelerated testing. Accurate extrapolation to circuit operating conditions requires a thorough understanding of the impact of the accelerated stress conditions on the parameters of the failure distribution. In this paper we examine the…
A modified Freeman–Murray–Richards (FMR) correlation for the analysis of 59Co NMR shielding parameters, δ(59Co)vs.(Δv*1/2)1/2/ΔEav, is formulated by combining the Ramsey shielding theory and the Townes and Dailey theory for the calculation of the nuclear quadrupole coupling constant. It is demonstrated that the experi…
The New Zealand solitary ascidian Pyura pachydermatina (Phylum Chordata, Subphylum Urochordata) is a sessile filter feeder in rocky wave-swept coastal areas. The body is on a long stalk; both are covered by a tough fibrous tunic. Two types of spicules are formed in vascularized areas: "antler-shaped" branched spicules…
Conflicting observations have been reported about redoximorphic features in soils derived from red Triassic sediments. Previous laboratory research has shown that development of redoximorphic features is sometimes inhibited in these sediments. Soil morphological descriptions made under the auspices of The National Coo…
Solutions prepared by dissolving synthetic poly( p -phenyleneterephthalamide) (PPTA) in 99.8% H 2 SO 4 were analyzed using natural abundance NMR methods as a function of the polymer concentration, molecular weight, and temperature. Concentration and molecular weight-driven transitions between isotropic, nematic, and s…
A novel type of liquid crystalline ferrocene derivatives has been synthesised and investigated. These metallomesogens consist of two rod-like 4,4″-disubstituted p-terphenyl rigid cores which are laterally connected to each other via spacers incorporating 1,1′-disubstituted ferrocene units. These materials have broad s…
The chemical composition of romeite from the regionally metamorphosed bedded manganese ore deposit of the Gozaisho mine, Fukushima Prefecture, is (Na1.00Ca0.80Mn0.01)Σ1.81Sb2 [O5.69F0.89(OH)0.36]Σ6.94, calculated on the basis of Sb=2. It occurs as honey yellow to brownish yellow octahedra up to 4 mm long in braunite-r…
Although InP is widely used in optoelectronic applications, \nlittle is known about the surface chemistry of this important semiconductor. Modification of the InP surface is potentially important as a route to introduce functional groups for the stabilization of InP photoelectrodes,4 to control the surface recombi…
Experimental solubilities are reported for anthracene dissolved in seven binary mixtures containing 2-methoxyethanol with 1-propanol, 2-propanol, 1-butanol, 2-butanol, 1-octanol, 2-methyl-1-propanol, and 3-methyl-1-butanol at 25 °C. Results of these measurements are used to test two mathematical representations based…
A computational method, using the Flory−Huggins lattice model, the extended random copolymer theory, and a molecular modeling method to account for the end group effect on the χ interaction parameter and on the value of the temperature where the phase separation of a polymer blend occurs, is proposed. The overall χ in…
The effects of 5% wt BaTiO/sub 3/ additive and of electrode material on space charge formation and electric field distribution in low density polyethylene (LDPE) were investigated using a thermal step technique. Space charge was formed at an average dc field of /spl sim/28 kV/mm and at 50/spl deg/C. Results indicate t…
The crystal structure of Li3SbO4 has been determined by analogy with Na3BiO4, and refined by the Rietveld method using X-ray powder diffraction data. It is monoclinic, space group P2/c, a= 5.1579(2), b= 6.0922(3), c= 5.1397(2)Å, β= 108.839(4)°. The structure is an ordered rocksalt type, with distorted MO6 octahedra.
Description Stabilization and solidification (S/S) technologies have been used for decades as a final treatment step prior to the disposal of radioactive and chemically hazardous wastes. STP 1240 provides you with the latest technical exchange of S/S information available from both of these scientific communities. The…
trans -1,2-Bis(2-pyrrolyl)ethenes (e.g. 18 − 20 ) are prepared by McMurry-type reductive coupling of the corresponding 2-formylpyrroles. The isomeric 1,1-bis(2-pyrrolyl)ethenes (e.g. 24 ) are prepared as a minor byproduct in the reaction of 2-unsubstituted pyrroles (e.g. 22 ) with acetic anhydride under Friedel−Crafts…
This study deals with the changes in the optical properties of polypropylene fibres (4:1 draw ratio 515 tex polypropylene, Bolton, UK) due to the effect of thermal annealing on its structural characteristics. Changes in the structure of annealed polypropylene fibres at a constant time of 2 h and different temperatures…
Total electron-yield (TEY) detection has long been regarded a method for XAS investigations of surface adsorbates under ultra-high vacuum conditions. Recent work has shown, however, that the technique can also be applied to in situ studies of catalysts under reaction conditions. We have thoroughly investigated the TEY…
It has long been recognized that the interphase, i.e., the region between adjacent phases in heterogeneous materials, is a major factor in determining many of the mechanical, optical, and electronic properties of such systems. Interphases are, in general, not abrupt, but exhibit a gradient in the composition from one…
This paper discusses the results on deposition conditions, rates of polymerization, and properties of carbon disulfide films prepared by two techniques, viz., plasma polymerization and argon-plasma-assisted polymerization of carbon disulfide. A higher rate of polymerization and sulfur content was obtained for carbon d…
Microstructures of reaction-bonded Si3N4 bodies, which were fabricated at 1623 K, have been studied to identify the nitridation mechanism of Si compacts by transmission electron microscopy. The percent nitridation of the Si compacts gradually increases with increasing reaction time. In the sample nitrided for 36 ks, t…
Influence of vulcanization conditions (time, pressure and mould thickness) on the electrical conductivity σ- of a 60 FEF/SBR sample was studied. It was found that the mechanism of conduction is highly affected by the different vulcanization conditions. The minimum conductivity value σmin of this compound increases wit…