Materials Literature
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The magnetotransport properties of ${\mathrm{NbSe}}_{3}$ in the temperature range below the second charge-density-wave (CDW) onset of 59 K have been studied in magnetic fields up to 230 kG. At liquid-helium temperatures giant magnetoquantum oscillations caused by magnetic breakdown (MB) between the normal Fermi surfac…
The phase behavior of liquid cyrstalline polymers and oligomer model compounds with alkylated tripheylenes (see figure) as the mesogenic core is studied using a combination of optical microscopy, DSC and 2 H NMR. The information provided by NMR provides unique insights into the behavior of liquid crystalline phases. m…
Abstract
Measurements of surface area reduction of TiO 2 anatase powder (of initially 100 m 2 · g −1 ) were carried out for various partial pressures of water and oxygen at 823 K. The kinetic equation obtained for the experimental rates has the formulation r = k[P H2O ] 1/α [ P O2 ] 1/β where α and β are equal to 2 and ‐12, re…
Abstract
Abstract The thermodynamic principles of conventional (T‐ x , P‐T) phase diagrams and solubility (log ΣK‐ x ) diagrams depicting solid‐solute phase equilibria in aqueous solution are derived from a unifying point of view. It is shown that thermodynamic quantities necessary for the construction of conventional phase di…
There is still some debate on the extent of plasticity of oxide scales at high temperatures. Examination of scales after creep of the substrate often shows that at higher strain rates scale cracks are visible after only very low strains (brittle behaviour), whereas at low strain rates no scale cracks are observed afte…
The ellipsometric measurement of refractive indexes for films less than 50 nm thick is of dubious quality due to the significance of the size of random errors relative to the accuracy required to extract reliable index values from the measurements. In this study the various errors are quantitatively assessed as a func…
A fiber-optic system was developed for exciting and collecting surface-enhanced Raman scattering (SERS) signals generated from a sensing plate tip having silver-coated microparticles deposited on a glass support. Various fiber parameters, such as fiber type, fiber-substrate geometry, and other experimental parameters,…
The synthesis, structural characterization and electrical conductivity measurements of α-,β-[(CH3)4N][Pd(dmit)2]2 and [(CH3)4As][Pd(dmit)2]2 are reported. They have similar crystal structures made of stacked Pd(dmit)2 dimers. The mode of the intra-dimer molecular overlapping is that of the eclipsed type. Pd atoms devi…
Two new charge-transfer salts [bettf]2[FeCl4](1) and [bettf][FeBr4](2) have been prepared and crystallised electrochemically [bettf = bis(ethylenedithio)tetrathiafulvalene]. The crystal structures of both salts have been refined in the P space group, the unit-cell parameters being: (1), a= 6.626(2), b= 15.025(2), c= 1…
Recent advances in the methods of structural analysis, in particular the use of particle accellerators to produce pulsed neutrons and synchrotron radiation, have greatly improved our ability to describe the atomic structure of non-periodic matter quantitatively using the atomic pair distribution analysis, or the real-…
Abstract Thin plasma polymerized layers of acrylic acid (PPAA) were deposited onto polyethylene and muscovite mica surfaces. Structure and surface properties of the deposited layer depend on the polymerization conditions. The content of carboxylic groups in the layer decreases, whereas the degree of crosslinking or br…
The characteristics of the high energy product NdFeB magnets obtained by the powder metallurgy route have been improved by appropriate vanadium additions. Specific combinations of V and Co lead to an intrinsic coercive force of about 1350 kA/m (17 kOe) in Dy-free magnets, without any large decrease of remanence. If 1.…
Plasma treatment of ultra-high strength polyethylene (UHSPE) fabric using ammonia gas to implant surface amine groups was investigated. The effects of three treatment times and three treatment powers were studied. After treatment, the wettability of UHSPE fabric was found to increase dramatically, becoming completely…
Abstract Variant of the serine protease, subtilisin BPN′, in which the catalytic triad residues (Ser‐221, His‐64, and Asp‐32) are replaced singly or in combination by alanine retain activities with the substrate N ‐succinyl‐ L ‐Ala‐ L ‐Ala‐ L ‐Pro‐ L ‐Phe‐ p ‐nitroanilide (sAAPF‐ pna ) that are at at least 10 3 to 10…
Abstract This paper presents the predictions of a hybrid model of fabric development in quartzites that combines aspects of previous models based on lattice rotations and dynamic recrystallization. The input parameters for the model have been systematically varied in order to investigate changes in deformation fabrics…
A supported Mn–porphyrin catalyst has been prepared by immobilisation of the tetracationic Mn [meso-tetra (4-N-methylpyridiniumyl)porphyrin]Cl4+ on montmorillonite, and is found to be efficient for alkene epoxidation and alkane hydroxylation by PhlO, with a higher ability to oxidize alkanes, and in particular short li…
A progress report is given on recent experimental studies of core excitation and inoization of free-molecules in the VUV and soft x-ray (50 to 2600 eV) by electron impact and x-ray photoabsorption (XAS) techniques. The current capabilities of inner shell electron energy loss spectroscopy (ISEELS) and XAS for gas phase…
The overlayer method for determining the attenuation length was simulated by the Monte Carlo method. The theoretical model was based on the elastic scattering cross sections resulting from the partial wave expansion method. Multiple elastic electron collisions in the solid were considered. Calculations were made for M…