Materials Literature
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Phases determined by the molecular-replacement method often suffer from model bias. In extreme cases, the refinement of the atomic model can stall at high free R values when the resulting electron-density maps provide little indication of how to correct the model, sometimes rendering even a correct solution unusable.…
A study of the optical and electrical properties of a conducting polypyrrole–polyoxyphenylene composite, PPy–POP, prepared by insitu electropolymerization is presented. Electropolymerization was performed potentiostatically in a solution of pH 9 which contained the monomers pyrrole, allylphenol and sodium 4-hydroxyben…
Microfibrils differ in their geometrical arrangement between the orthocortex and the paracortex of a wool fibre. An investigation is reported as to whether these differences, combined with a large shrinkage perpendicular to the fibre direction as the fibre dries from an initial wet state, could account for the curvatu…
Two organo-soluble aromatic polyimides have been synthesized by introducing pendant groups of trifluromethyl or methyl onto the 2- and 2′-positions of a biphenyl diamine and reacting each of them with biphenyltetracarboxylic dianhydride (BPDA): 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl (PFMB) or 2,2′-dimethyl-4,4…
This paper proposes a design-oriented thermomechanical model of SMA wires. This model describes at a macroscopic scale the deformation of SMA wires in function of parameters governing the phase transformation (temperature and stress). This model is experimentaly validated on one of the most popular manufactured produc…
In this paper, the equilibrium and growth behaviour of faces (hkl) with more than one connected net is studied. It is shown that for these types of orientation different surface phases exist under equilibrium conditions as a function of temperature. Depending on the exact bonding topology at the surface, flat, rough o…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMechanism-Based Inactivation of the Human Prolyl-4-hydroxylase by 5-Oxaproline-Containing Peptides: Evidence for a Prolyl Radical IntermediateMin Wu, Hong-Sik Moon, Tadhg P. Begley, Johanna Myllyharju, and Kari I. KivirikkoView Author Information Department of Chemistr…
A simple and fast approach is used for the first time to develop a time resolved lanthanide-sensitized luminescence method for the simultaneous determination of a preservative and a sweetener, namely benzoic acid (BZ) and saccharin (SC), respectively, in food samples. The method involves the formation of the correspon…
In methanol, [n-Bu4N][MoCp*O3] reacted with [n-Bu4N]2[Mo4O10(OMe)4Cl2] to yield [n-Bu4N][Mo6Cp*O18] in reasonable yield, thus opening a new route in the synthesis of organometallic derivatives of polyoxometalates. The crystal and molecular structure of [n-Bu4N][Mo6Cp*O18]·Me2CO has been determined by single-crystal X-…
In this paper, recent works on impact perforation of fiber composite laminates struck by foreign objects traveling at high speed have been reviewd. The review focuses on two major subjects in impact perforation research, i.e., an assessment of perforation characteristics and an understanding of the perforation process…
ZnO thin films were deposited by spraying of zinc acetate solution onto heated glass substrates at 670 K. Highly textured in the (002) direction undoped ZnO films, exhibiting exciton emission bands in photoluminescence spectra at 8 K, were grown. The initial stages of the thin film growth and effect of doping with In,…
A new type of HDDR (Hydrogenation, Disproportionation, Desorption, Recombination) processing route, in which alloys are heated up under a low pressure of H/sub 2/ for the disproportionation stage, was found to be an effective way of obtaining high remanence Nd-Fe-B ternary powders, with no large decrease in coercivity…
Due to structural limitation, the currently proposed apparatus based on a single sheet tester (SST) cannot measure magnetic properties along arbitrary directions (so-called 2-D magnetic properties) of silicon steel at high flux densities. In this paper, significant improvements are carried out on magnetizing windings…
A new series of luminescent dinuclear six-coordinate cadmium(II) diimine complexes with bridging chalcogenolate ligands has been synthesized and characterized, and shown to exhibit interesting photophysical and electrochemical properties. The X-ray crystal structures of [(phen)2Cd(µ-SC6H4CH3-p)]2(PF6)2 (11) and [(phen…
Analysis of the dynamic structure factor, , measured by means of inelastic neutron and x-ray scattering, for vibrations around the boson peak in glasses, demonstrates the presence of coherent- and random-phase contributions. It is found that systems with strong boson peaks have larger random-phase contributions to . T…
The granular perovskites , with the concentration x from 0.05 to 0.5, have been fabricated by the sol-gel method. The concentration-dependent transport properties in the granular perovskites have been investigated. Spin-dependent interfacial tunnelling and the corresponding tunnel-type magnetoresistance have been obse…
Silver sulfide particles embedded in thin coatings of transparent and homogeneous silica glass are promising materials for the development of optical devices. The optical properties are strongly dependent on the elemental composition and morphology of the coatings as well as on the size distribution of the nanocluster…
In Methanobacterium thermoautotrophicum, the fmdECB operon encoding the molybdenum formyl-methanofuran dehydrogenase is directly preceded by an open reading frame tfx predicted to encode a DNA binding protein. The 16.1 kDa protein has an N-terminal basic domain with a helix-turn-helix motif for DNA binding and a C-ter…
We report, for the first time, epitaxial growth of high-quality ZnS films on sapphire and silicon substrates, using pulsed laser deposition. X-ray diffraction results show that at all growth temperatures from 200 °C to 680 °C, epitaxial wurtzite (002) ZnS films have been successfully grown on (10 2) sapphire and (001)…
The relative stabilities of the following phases: graphite-C3N4, α-C3N4, β-C3N4, cubic-C3N4 and pseudo-cubic-C3N4 have been determined using density functional theory in its local density approximation. In particular three calculational methods were imployed: augmented spherical wave, linear muffin-tin orbitals and fu…