Materials Literature
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We re-examine two important issues within the Peierls-Nabarro model, which are critical in obtaining accurate values for the Peierls stress. The first is related to the sampling scheme (double versus single counting) of the misfit energy across the glide plane and the second is the effect of atomic relaxation on the P…
An analytical set of field-induced coordinates (FICs) is defined. It is shown that, instead of 3N−6 normal coordinates, a relatively small number of FICs is sufficient to describe the vibrational polarizability and hyperpolarizabilities due to nuclear relaxation. The fact that the number of FICs does not depend upon t…
Employing synchrotron radiation in backscattering geometry we studied the 105 K cubic to tetragonal (CT) phase transition of SrTiO3 by X-ray diffraction using the (006) reflection of three (001) oriented samples. Two of the crystals were covered with ultra-thin films of YBa2Cu3O7–δ (14 nm) and GdBa2Cu3O7–δ (28 nm), re…
We examined the solid-state structures of two cylinder-forming semicrystalline diblock copolymers, where polyethylene forms the continuous matrix in both, using simultaneous small- and wide-angle X-ray scattering combined with transmission electron microscopy. The mesophase structure formed in the melt is largely reta…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of New Water-Soluble Self-Doped PolyanilineHsien-Kuang Lin and Show-An ChenView Author Information Department of Chemical Engineering, National Tsing-Hua University, Hsinchu, Taiwan 30043, ROC Cite this: Macromolecules 200…
The effects of the oxide additives MnO 2 , Co 3 O 4 , and Sb 2 O 3 , commonly incorporated in commercial Bi 2 O 3 ‐doped ZnO varistors, on the current–voltage characteristics and microstructure of 0.25 mol% V 2 O 5 ‐doped ZnO varistors have been studied. MnO 2 is the most significant additive in terms of its effects o…
The synthesis of intramolecularly hydrogen-bonded dendrons with stereogenic terminal groups derived from (1 S, 2 S )-(+)-thiomicamine up to the third generation is described. Circular dichroism (CD) studies reveal that the equilibria interconverting two diastereomeric helical conformations (M and P helices) relating a…
The diatom Achnanthes brevipes C.A. Ag. was cultured in the presence of limiting concentrations of nitrogen (N) or inorganic phosphate (P i ). Growth, in terms of final yield, was more affected by N limitation than P i limitation; N limitation had a greater effect also on protein and chlorophyll content. Carbohydrate…
Whether or not exercise training of sufficient intensity and duration to produce left ventricle (LV) hypertrophy also regulates deposition of interstitial collagen and cross-linking at the pretranslational level is unknown. Therefore, the effects of exercise training on gene expression for the two principal fibrillar…
Abstract Three fatty acid triazoles, namely, 3‐undecane‐4‐aryl‐5‐mercapto‐1,2,4‐triazole (triazole 1), 3(heptadeca‐8‐ene)‐4‐aryl‐5‐mercapto‐1,2,4‐triazole (triazole 2), and 3(deca‐9‐ene)‐4‐aryl‐5‐mercapto‐1,2‐4‐triazole (triazole 3) were synthesized and their corrosion‐inhibiting action in 15% hydrochloric acid was ev…
Thin films of zinc oxide were deposited by dc reactive magnetron sputtering onto glass substrates held at a temperature of 663 K and oxygen partial pressure of 1x10-3 mbar, and at different sputtering pressures in the range 3x10-2 - 10x10-2 mbar. The effect of sputtering pressure on the structural, electrical and opti…
Pb(Zr, Ti)O 3 (PZT) thin films with Zr/(Zr+Ti) of 0.42 were prepared on (111)Pt/Ti/SiO 2 /Si substrates at 620°C by metalorganic chemical vapor deposition (MOCVD). We attempted the pulse introduction of a mixture of source gases into the reaction chamber and succeeded in simultaneous improvements of the crystallinity,…
Synechocystis sp. strain PCC6803 possesses a polyhydroxyalkanoate (PHA)-specific beta-ketothiolase encoded by phaA(Syn) and an acetoacetyl-coenzyme A (CoA) reductase encoded by phaB(Syn). A similarity search of the entire Synechocystis genome sequence identified a cluster of two putative open reading frames (ORFs) for…
Abstract The effects of the incorporation of different types of fibers on the crystallization kinetics and thermodynamics of isotactic polypropylene (iPP) are investigated. The study is mainly performed by thermal analysis, both in isothermal and constant cooling rate conditions, utilizing differential scanning calori…
Cellulose and their derivatives only rarely form molecularly dispersed solutions. Colloidal aggregates of yet not fully explored supramolecular structure remain preserved even at the highest dilution. The present contribution is concerned with the determination of the number of aggregated chains per colloid particle.…
Abstract The fatigue mechanism of photochromic 1,2-bis(2,5-dimethyl-3-thienyl)perfluorocyclopentene was studied in hexane solution. Upon irradiation with ultraviolet light, two kinds of by-products were produced in addition to normal photochromic reactions. The major by-product was isolated by HPLC, and was characteri…
The nonlinear oscillations of a spherical, acoustically forced gas bubble in nonlinear viscoelastic media are examined. The constitutive equation [Upper-Convective Maxwell (UCM)] used for the fluid is suitable for study of large-amplitude excursions of the bubble, in contrast to the previous work of the authors which…
The structure of PbO–B 2 O 3 glasses has been investigated in the composition range of 25–80 mol% PbO by using X‐ray diffraction and 11 B NMR techniques. The well‐separated peaks due to Pb–O and Pb–Pb pairs were first observed in the radial distribution function, and peak deconvolution was performed by using a pair fu…
Thermochromic monoclinic-tetragonal VO 2 films were successfully deposited on glass substrates with high reproducibility by rf magnetron sputtering using V 2 O 3 or V 2 O 5 targets. In the case of reactive sputtering using a V-metal target, the VO 2 films could be obtained only under the very narrow deposition conditi…
Abstract This paper presents an experimental study on foam processing of polystyrene (PS) and high‐impact polystyrene HIPS/wood‐fiber composites in extrusion using moisture as a blowing agent. Wood‐fiber inherently contains moisture that can potentially be used as a blowing agent. Undried wood‐fiber was processed toge…