Materials Literature
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Co-sublimation of the dithiadiazolyl radical, p-NCC 6 H 4 CNSSN 2 with the inclusion-forming host compound perhydrotriphenylene (PHTP) leads to trichroic crystals of the host-guest complex [PHTP-2]. Molecules of 2 are linked through a CN‥S interaction (ca. 3.03 Å) to form polar chains within the channels of the PHTP h…
An RTV silicone rubber coating applied to insulators in a 345 kV switchyard located near Long Island Sound has depolymerized and become putty-like after six years of service. Coating samples were taken from high creep insulators which were energized and weathered, weathered but not energized, and neither weathered or…
Interfacial studies of a series of subphthalocyanine (SubPc) macrocycles 1-3, 5 and 6, differently substituted either in the periphery (with polar and donor groups) or in the axial position of the macrocycle (with a chlorine atom or a trihexylsiloxy group), have been carried out. Remarkable changes in the orientation…
The Fokker-Planck equation and molecular-based grand friction tensor are derived for the problem of rotational and translational motions of a structured Brownian particle, including the presence of a structured wall. Using the method of multiple time scales, it is shown that the time independent, grand friction tensor…
The behaviour of vibrational plane waves in disordered solids has been studied theoretically, particularly in the vicinity of the Ioffe-Regel crossover. We have analysed the behaviour of vibrational excitations in vitreous silica, for which we have found the Ioffe-Regel crossover frequency to be THz (for both longitud…
Thermal treatment of 2,4,6-[(NHPr i ) 2 B(NPr i )] 3 B 3 N 3 H 3 in vacuo led to a polyborazine in which the borazine rings are mainly linked by –N–B–N– bridges. Pyrolysis of up to 1400 °C resulted in the formation of high crystallinity hexagonal boron nitride which has been characterised by ESCA, powder X-ray diffrac…
Chemogradient surfaces whose properties are changed gradually along the sample length are of particular interest for the basic studies of the interaction between biological species and surfaces since the effect of a selected property can be examined in a single experiment on one surface. A wettability chemogradient on…
A new thermal model is introduced which is based on unique references, specifically suited to design and optimization of high-frequency high-power magnetic components. This thermal reference model is independent of shape, size and orientation, so that a general set of data may be used to optimize transformer structure…
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…