Materials Literature
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In order to obtain liquid crystalline comb-like poly(L-lysine) bearing biphenylyl mesogenic groups in their side chains, we synthesized the 11-(biphenyl-4-carboxamido)undecanamidoL-lysine (KC10φφ) from L-lysine by a five step procedure and transformed the KC10 φφ into its polymerizable cyclic derivative (the N-carboxy…
Since lead contaminates the environment, the various types of shape-controlled-sulfide (SCS) free machining steel, in which sulfide shapes are controlled to be spherical, have been developed to replace the leaded ones. However, in these SCS free machining steels, the effect of aspect ratio, size, and composition of su…
ADVERTISEMENT RETURN TO ISSUEPREVCommentComment on "Lattice Contraction and Surface Stress of fcc Nanocrystals"J. WeissmüllerView Author Information Forschungszentrum Karlsruhe, Institut für Nanotechnologie, D-76021 Karlsruhe, Germany and Universität des Saarlandes, Technische Physik, Saarbrücken, Germany Cite this: J…
The mechanism of interfacial failure occurring as a consequence of the stress concentration induced by a matrix crack located in the vicinity of the interface is analysed. For this purpose, an asymptotic analysis is carried out to assess the competition between the propagation of the matrix crack towards the interface…
Raman spectroscopy has been utilized to investigate the Sr-substitution, stress/strain, and grain size effects in Ba 1 m x Sr x TiO 3 ceramics. Ceramic samples were prepared for x = 0.00, 0.10, 0.30, and 0.35 compositions using a solid-state reaction technique. Single-phase perovskite structure of the ceramics was ide…
Ten 35Ag-30Pd-20Au-15Cu alloys containing 0.00, 0.25, 0.50, 0.75, 1.00, 1.25, 1.50, 2.00, 4.00, or 6.00% Ga were experimentally prepared to investigate the effect of Ga on their mechanical properties in addition to their use for denture frameworks, connectors and clasps. The effect of Ga addition on the mechanical pro…
Previous studies on the Ehrlich ascites tumor (EAT) model indicate that tumor progression is associated with reduced myelopoiesis and increased extramedullar hematopoiesis. In order to investigate the in vivo antitumor activity of Acanthospermum australe, its hydroalcoholic extract was partitioned with different solve…
(Y,Yb)MnO 3 thin films were prepared on Pt(111)/TiO x /SiO 2 /Si substrates using alkoxy-derived precursor solutions. The annealing conditions were critical for crystallization of (Y,Yb)MnO 3 films. The (Y,Yb)MnO 3 films crystallized in vacuum were hexagonal phase and the orientation of the films changed with composit…
Results reported earlier showing a close correlation between measured adhesion strength of bonds between silane-modified glass and various amorphous thermoplastics and a thermodynamic compatibility criterion based on UNIFAC are extended to the case of a crystalline polymer matrix. The criterion used is the magnitude o…
The influence of grinding white sepiolites from the Magure-Golesh mine in Southern Serbia on their structure and on the rheological characteristics of their aqueous suspensions was investigated. Sepiolite samples of hard and soft consistency were ground in three different types of mills: a ball mill air-stream mill, a…
Basic studies have been conducted on stress measurement using magnetostriction features of mild steel under orthogonal magnetic fields. Most studies on the magnetostriction characteristics have been made using a single magnetic field when dealing with biaxial stress fields. An idealized model is proposed that is based…
A fast numerical-linearisation technique is used with the harmonic-domain algorithm to calculate the harmonic impedances of AC-DC converters. The accuracy of the new method is illustrated by comparison with existing simplified models. The method is then used to determine the effect of local and remote converter plant…
The phonon spectra, Born effective charges, dielectric constants and elastic modules of Na3OCl, Na3OBr, K3OCl and K3OBr have been calculated by the generalized Gordon-Kim method. In the phonon spectra of Na3OCl, K3OCl and K3OBr unstable modes are found
We report interface engineering in ZnO epitaxy to grow high-quality layers by plasma-assisted molecular beam epitaxy. Through interface engineering, we have succeeded in two-dimensional layer-by-layer growth of ZnO both on sapphire and GaN, and control of lattice polarity of ZnO films on a Ga-polar GaN template. MgO b…
Extended X-ray absorption fine structure measurements have been performed on Yb3+ in silicate, borate, phosphate, and gallate glasses in order to investigate the local structures surrounding Yb3+. The local structures of Yb3+ ions in silicate, borate, and phosphate glasses were similar to those of Er3+ ions. Yb3+ ions…
The interaction between polyaniline (PAn) and 2,5-dimercapto-1,3,4-thiadiazole (DMcT) was investigated by means of cyclic voltammetry and UV-visible spectroscopy. The results show that the polymerization-depolymerization reaction of DMcT or its dilithium salt Li 2 DMcT is a kinetically quasi-reversible process. PAn ex…
A rigorous mathematical model is developed for the complex impedance of a solid-state electrochemical cell, which is commonly used for the measurement of oxygen transport, oxygen exchange kinetics, and thermodynamic properties of nonstoichiometric mixed conducting oxides. The model leads to a simple equivalent circuit…
A constitutive model with a thermal activation plastic component combined with a Maxwell‐Weichert linear viscoelastic component was applied to describe the dynamic elastic and plastic stress‐strain behavior of polytetrafluoroethylene as a function of temperature, strain rate, and pressure. The linear viscoelastic comp…
Properties and application of aliphatic polyester products (Masatsugi Mochizuki) Aliphatic polyesters (Ann--Christine Albertson and Indra K. Varma) Biodegradable polyester Biopol(R) (Jawed Asrar and Kenneth J. Gruys) Applications of PHAs in medicine and pharmacy (Simon F. Williams and David P. Martin) Polylactides (Hi…
Waste from the manufacture of chrome-tanned leathers (so-called shavings) can be processed (apart from alkaline or acid breakdown) by enzymatic hydrolysis employing alkaline proteases. Under mild reaction conditions, a soluble collagen hydrolyzate is formed and a solid fraction (so-called chrome cake) with high chromi…