Materials Literature
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We propose and study a method that self-consistently solves for the current and voltage distributions in random fuse network problems using lattice Green's functions. The method solves for the current distribution by only keeping track of the defect bonds and can treat networks with two extreme types of defects: insul…
Abstract The thermal properties of uniformly random poly(butylene adipate/isophthalate) copolyesters of various composition and different molecular weight were investigated by means of differential scanning calorimetry. All copolymers were partially crystalline, and the main effect of copolymerization was a lowering i…
Electrical conductivity is studied in two component composites, one of which is insulating polymer (nylon6, nylon66) in fibers coated with conducting polypyrrole and the other, polyethylene in spheres without coating. Conductivity is enhanced by more than 15 orders of magnitude when the concentration of polypyrrole-co…
Metal-insulator-semiconductor (MIS) structures of heavily doped ( 6–7×10 18 cm -3 ) epitaxial diamond were prepared, which include highly polarizable BaTiO 3 insulator films. They were characterized by capacitance-voltage ( C-V ) and electron-beam-induced-current (EBIC) measurements. Despite the presence of background…
Abstract Poly[(2,4‐dichloro‐6‐ethoxy‐s‐triazine)‐alt‐(bisphenol A)] (T‐BPA), a polymer with interesting mechanical and thermal properties, was synthesized by phase transfer catalysed interfacial polycondensation. The reaction conditions for the synthesis of T‐BPA were investigated and optimized. The influence of sever…
Highly-dense spherical particles of thorium-based oxides, ThO2 and (Th, U)O2, prepared by the sol-gel method were subjected to dissolution with nitric acid containing 0–0.05 mol/l NaF at high temperatures above 120°C. The dissolution rate depended upon temperature, fluoride concentration and UO2 content. High-temperat…
The corrosion resistance of molybdenum, molybdenum disilicide, and a SiC (p) /Al 2 O 3 composite to molten soda‐lime‐silicate glass was studied. The ASTM‐C621–84 corrosion test method was modified because of inherent inaccuracies in the method and Si attack of platinum crucibles. Specimen‐glass interfacial regions wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Analysis: X-ray Photoelectron Spectroscopy and Auger Electron SpectroscopyNoel H. Turner and John A. SchreifelsCite this: Anal. Chem. 1994, 66, 12, 163–185Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb Initio Crystal Structure Determination of VO(H2PO2)2.cntdot.H2O from X-ray and Neutron Powder Diffraction Data. A Monodimensional Vanadium(IV) HypophosphiteA. Le Bail, M. D. Marcos, and P. AmorosCite this: Inorg. Chem. 1994, 33, 12, 2607–2613Publication Date (Print):June…
Abstract Poly( N ‐vinyl‐2‐pyrrolidone) (PVP) was blended with poly[styrene‐ co ‐(4‐hydroxytyrene)] (PSH) which was obtained from the random copolymer poly[styrene‐ co ‐(4‐acetoxystyrene)] (PSA). The miscibility of PVP/PSH blends in a composition 1 : 1 by weight was evaluated by differential scanning calorimetry (DSC),…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Percolation View of Novolak Dissolution. 3. Dissolution InhibitionHsiao-Yi Shih, Tung-Feng Yeh, Arnost Reiser, Ralph R. Dammel, Hans J. Merrem, and Gerhard PawlowskiCite this: Macromolecules 1994, 27, 12, 3330–3336Publication Date (Print):June 1, 1994Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of .alpha.- and .beta.-Silicon Atoms on the Free Energies of C-H Homolysis and HeterolysisM. J. Bausch and Yong GongCite this: J. Am. Chem. Soc. 1994, 116, 13, 5963–5964Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published iniss…
The 0.02M strontium chloride (SrCl2) and 0.05M citric acid solution (Sr‐citrate) was developed for the simultaneous determination of availability indices for plant nutrients from soils. The objective of this study was to compare the Sr‐citrate extracting solution with water, 0.002M SrCl2, 0.1M barium chloride (BaCl2),…
A new figure-of-merit function for full-profile fitting of powder patterns has been tested using the neutron diffraction data file for PbSO4, distributed during the first part of the Rietveld Refinement Round Robin organized by the Commission on Powder Diffraction of the International Union of Crystallography, and the…
The mechanics of impact by a high-speed liquid jet onto a solid surface covered by a liquid layer is described. After the liquid jet contacts the liquid layer, a shock wave is generated, which moves toward the solid surface. The shock wave is followed by the liquid jet penetrating through the layer. The influence of t…
The protective effect of oxide scales is strongly linked with their behaviour under mechanical loading. Scale cracking may occur at relatively low strains and a decisive part is played by the process of scale crack healing due to ongoing oxidation. It can even be maintained that many technical high temperature materia…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron(III) Porphyrin Complexes with Axial Alkyl and Acyl Ligands. Structures and Reactivity of the Acyl Complex toward DioxygenAlan L. Balch, Marilyn M. Olmstead, Nasser Safari, and Tamara N. St. ClaireCite this: Inorg. Chem. 1994, 33, 13, 2815–2822Publication Date (Print):Ju…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of Heat treatment on Properties of Poly(3-alkylthiophene)Masahiro Nakazono, Tsuyoshi Kawai, and Katsumi YoshinoCite this: Chem. Mater. 1994, 6, 6, 864–870Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994h…
Abstract A novel type of block copolymers comprising both side‐chain and main‐chain liquid‐crystalline (LC) blocks in the same macromolecular structure was synthesized and studied. The former block was either one of two LC polymethacrylates containing an azobenzene mesogen with different substituents (block A), and th…
For large deformations, the governing equations of elastic-plastic flow may lose their hyperbolicity and become ill posed at some critical values of the hardening modulus. This ill-posedness is characterized by uncontrolled growth of the amplitude of plane wave solutions in certain directions. To capture post-critical…