Materials Literature
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The atomistic simulation of properties and phenomena in solid materials requires a suitable model of the real system with a number of atoms which is still manageable at the chosen level of approximation. Since typical solids consist of atoms in the order of 1023, only a very small fraction of them can be treated expli…
Mesoporous SnO2–SiO2 composite stable up to 600 °C with a BET surface area of 350 m2 g−1 and an average pore size of 3.4 nm is successfully prepared, which exhibits promising cycling properties as anodes for lithium batteries.
A block copolymer of α–acetal–poly(ethylene glycol) and polylactide(PEG/PLA) was prepared and utilized as a surface modifier to construct a functionalized PEG layer on a PLA substrate by simple coating. An active functional group, aldehyde, was readily prepared by the derivatization of an α–acetal group at the tethere…
Silky fowl, a breed of chicken, is hyperpigmented in its various internal tissues. The pigment was extracted from various tissues of two strains of Silky fowl to determine its molecular structure and internal distribution. Analysis by infrared spectroscopy showed two spectrum patterns of the pigment in Silky fowl; one…
Polythiophene (PTh) films, both p‐ and n‐doped, have been fully characterized in a solution of (tetraethylammonium tetrafluoroborate), in propylene carbonate (PC) by a simultaneous application of cyclic voltammetry and in situ conductometry. We observed a considerable charge‐trapping effect during n‐doping of PTh with…
FTIR and FT-Raman spectra of 5-methyluracil (thymine) were recorded in the regions 400–4000 cm−1 and 50–4000 cm−1, respectively. The observed wavenumbers were analysed and assigned to different normal modes of vibration of the molecule. Ab initio and density functional calculations were performed to support the assign…
Since the curing process of an epoxy thermoset is thermally-activated and temperature dependent, thermal analysis is the most common method to monitor the process. In addition, many common temperature-dependent properties like heat capacity and modulus change with the degree of cure or extent of cross-linking. Common…
Nitrogen-containing polymeric carbon as anode materials for the lithium ion secondary battery is prepared from polyacrylonitrile (PAN) and melamine–formaldehyde resin (MF) at 600 and 800°C. Its physicochemical properties were investigated through elemental analysis, X-ray powder diffraction, X-ray photoelectron spectr…
The self-consistent model of electrical tree propagation and partial discharge (PD) activity within growing tree channels is presented. The local electric field and the damage accumulation in the dielectric material surrounding the channels govern the tree growth. The damage increment is proportional to the energy rel…
Using the homogenization method, we derive a generalized impedance-type equivalent boundary condition for the electromagnetic (EM) field at a two-dimensional (2-D) periodic highly conducting rough surface with small-scale roughness. The results obtained in this paper generalize ones obtained preciously for the case of…
The hot workability and the magnetic properties of die-upset and backward extruded melt-spun magnets with the composition of Nd/sub 14.2/Fe/sub 80.8/B/sub 5/ (MQP-A), and Nd/sub 13.6/Fe/sub 73.6/Co/sub 6.6/Ga/sub 0.6/B/sub 5.6/ (MQU-F) have been investigated. Magnets of MQU-F powder show an improved hot workability an…
A composite of cellulose and aluminium oxide, cel/Al2O3, was prepared and further modified with organofunctional groups by reacting with the coupling reagent (C2H5O)3SiL, where L represents –(CH2)3NH2, –(CH2)3NH(CH2)2NH2, –(CH2)3NH(CH2)2NH(CH2)2NH2 or –(CH2)3N(C3H3)N [–N(C3H3)N = imidazolyl radical], abbreviated to ap…
An apparatus was developed to study water-transport behaviour along yarns. The rise of the liquid water in the yarn triggered an electrical circuit which was coupled with a personal computer, and so the distance of water rise as a function of time was determined. To smooth the data, the method of least squares was app…
The sinterability of two industrial mullite powders, in the presence of MgO as a sintering aid, was investigated. A glassy phase, which was generated during preparation, was present in both powders; this glassy phase had a strong influence on sintering, depending on its content, composition, and spatial distribution.…
In order to develop high energy Nd-Fe-B magnets, extensive studies of processing technologies have been done. With a new casting technology for Nd-Fe-B alloys, improvement of the preparation of fine powders having a sharp distribution of particle size, and adoption of a special CIP process, we have succeeded in obtain…
The influence of small substitution of iron with rare-earth cations in nickel zinc ferrites has been investigated. Samples with overall composition Ni0.50Zn0.51Fe1.96R0.04O4+δ (R = Pr, Nd, Eu, Ho, Tm, Lu) were prepared by a wet chemical route. The substitution of iron by rare-earth cations results in the formation of…
FT Raman study of 5-fluorouracil, an anticarcinogenic drug, was carried out. Ab initio and density functional computations of the vibrational spectrum, the molecular geometry, the atomic charges, the total energy, the zero point energy, the rotational constants, the room temperature entropy, (translational, rotational…
Mixed oxides based on nickel, cerium and aluminum, effective in the catalytic hydrogenation of unsaturated compounds, were prepared by a coprecipitation route and studied by XRD, TEM, XPS and ion sputtering techniques. The CeNixOy mixed oxides (0⩽x⩽1) can be described as a mixture of nickel oxide and ceria modified by…
Research Article| March 01, 2000 Self-sedimented diatom mats as agents of exceptional fossil preservation in the Oligocene Florissant lake beds, Colorado, United States Ian C. Harding; Ian C. Harding 1School of Ocean and Earth Science, University of Southampton, European Way, Southampton SO14 3ZH, UK Search for other…
Five complexes, [Ag6(bmimen)5(MeCN)][CF3SO3]6·H2O 1, [Ag7(bmimen)6][ClO4]7·MeCN 2, [Ag2(bmimen)2][NO3]2· 0.5H2O 3, [Ag3(bmimpn)2][CF3SO3]34 and [Ag3(bmimpn)2]n[NO3]3n5, were obtained by self-assembly of AgX (X = CF3SO3−, ClO4− or NO3−) with bmimen and bmimpn (bmimen = 1,2-bis[(1-methyl-2-imidazolyl)methyleneamino]etha…