Materials Literature
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This paper is concerned with a conserved phase-field model with memory. Weinclude memory by replacing the standard Fourier heat law with a constitutive assumptionof Gurtin-Pipkin type, and the system is conservative in the sense that the initial mass ofthe order parameter as well as the energy are preserved during the…
A series of catalysts has been analysed before and after their use for methane flameless oxidation with air. In most cases, a g2, linearly temperature-broadened, Lorentzian-shaped EPR line was observed at T>Tmin, where Tmin is the temperature corresponding to the narrowest EPR line, ranging between 244 and 392 K, depe…
We report on a direct method which allows, making use of the full crystal symmetry, to calculate the phonon dispersion curves from known Hellmann-Feynman forces found by any ab initio program. For non-ionic crystals the direct method reproduces exactly the dispersion curves, provided the range of interaction is confin…
In the Fourier modal method (FMM) and Chandezon method for modelling diffraction gratings, the reduction method is used to obtain approximate numerical solutions of certain matrix eigenvalue problems in the infinite Fourier space. However, at least in the optics literature to date, the legitimacy of using the reductio…
The NO+CO reaction on Pt{100} has been studied using in-situ vibrational spectroscopy (IRAS) under low reaction rate, non-oscillatory conditions. Using a total pressure of 7.5×10-7 mbar and a NO:CO ratio of 2:1, isocyanate (NCO) formation, characterised by an infrared absorption band at 2180 cm-1, is observed over a n…
A alloy electrode was immersed in a boiling 6 M KOH solution for a short period of time, and the effect on electrochemical and physicochemical properties of the alloy electrode was investigated. As a result, charge‐discharge characteristics of the alloy electrode were found to be greatly improved with increasing immer…
How to use this book Writing your weld procedure Identification of material Choosing your filler wire Heat control Weld techniques Equipment Basic TIG welding for beginners Appendices: Other steels and tool steels Elements and their symbols Millimetres to inches conversion table Temperature conversion table weld proce…
Nanometer silicon crystallites were fabricated by annealing a-Si:H/a-SiNx:H multiquantum well (MQW) structures with an excimer laser. The films were prepared by rf plasma enhanced chemical vapor deposition. Visible electroluminescence (EL) has been observed at room temperature from the crystallized samples that had Si…
We review the crystal structures, electrospray ionization mass spectra (ESI-MS) data and chiral HPLC data for the racemic and optically pure mononuclear AuL2 complexes, and for racemic [AuLI]n and optically pure [AgLII]n polymers (LI = thiomalate, LII = D-penicillamine). We postulate an equilibrium between polymeric,…
We describe a practical approach for computing the mobility matrix of a system of colloidal particles near a hard wall. The approach can be carried out in principle to arbitrary accuracy and number of particles. We make use of this approach to perform Stokesian dynamics computer simulations of colloidal suspensions in…
The present study deals with experiments carried out to assess the influence of the movement of equiaxed crystals on their growth kinetics. The principle of the experiments is based on the settling of crystals growing in melts of transparent alloy undercooled at constant temperature. Ammonium chloride-water mixtures h…
UV-Vis and lanthanide-induced 17O shift measurements on the complex [Eu(DOTA)]– (H4DOTA = 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) have shown that the inner co-ordination sphere of the Ln3+ ion is not affected on protonation which suggests that the proton is attached to a non-co-ordinated oxygen atom…
This paper investigates the feasibility of using dynamic arc modeling of polluted insulators to characterize approaching flashover. The leakage current (LC) simulation results are compared to the measured leakage current, digitized during flashover test. It was observed that the harmonic content of the leakage current…
Rapid quenching of the title bis(aminoxyl) 1 in 2-methyltetrahydrofuran from ambient temperature to cryogenic temperatures (5 K or below) produces 1 in its singlet state, which slowly converts at low temperatures, with an S-shaped time-dependence, to the triplet ground state.
The phase-field model is applied to simulate microstructural evolution during isothermal dendritic growth of the δ-phase in undercooled Fe-C liquid. The parameters of phase-field equation are determined by a thin interface limit condition. Realistic dendritic structures at various temperatures and compositions of the…
Regioregular polythiophene copolymers 10a-d containing hexyl and 11-hydroxyundecyl side chains have been synthesised, by nickel-catalysed cross-coupling of well-defined Grignard intermediates. The hydroxy groups were protected during the polymerisation as tetrahydropyranyl ethers, and subsequently transformed into azi…
The structural elucidation of eleven new related polyoxypregnane glycosides, gymnepregosides G (1), H (2), I (3), J (4), K (5), L (6), M (7), N (8), O (9), P (10) and Q (11), from the roots of Gymnema alternifolium (Asclepiadaceae) was achieved by a detailed study of 1H- and 13C-NMR spectral data and chemical means. T…
Two series of novel spiropyrans and spirooxazines having a heteroaromatic pendant were synthesized using two convenient methods.Their photochromic behaviors were investigated with the aid of absorption spectral measurements.The compounds showed several features different from the parent spiro compounds, including an i…
Glasses whose compositions are expressed by the general formula: (50-x/2) BaO. (50-x/2) B 2 O 3 .xTiO 2 with x=4, 8 and 16 have been prepared and the structural modifications occurring in the glass network as consequence of the heat treatments performed near the glass transition temperature and their effect on the dev…
A comprehensive study of the molecule of methanesulfonic acid hydrazide (MSH) is presented. The X-ray structure shows that in the crystal two centrosymmetrically oriented MSH molecules are held together by N–H···N hydrogen bonding interactions. This feature is unprecedented for the known arylsulfonic hydrazide analogu…