Materials Literature
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The effects of a long-range repulsive interaction on the phenomena of Ostwald ripening are studied. Beginning with a Langevin description, interface equations describing both the growth and motion of droplets are derived and solved numerically. Two noncoarsening and one coarsening regimes are found. In the noncoarseni…
Abstract Polycrystalline materials of the composition Sr 5− x − y Ca x Eu y (PO 4 ) 3 Cl with 0 ≦ x ≦ 4.99 and 0 ≦ y ≦ 0.1 crystallize in the hexagonal crystal system. The space group is P6 3 /m. The alkaline earth ions occupy two different crystallographical sites. In addition to X‐ray diffraction measurements, the o…
Abstract A bifurcational analysis is performed on Doi's equation of nematodynamics that describes the non‐equlibrium isotropic‐nematic phase transition of rigid rod polymers in the presence of steady biaxial stretching flow. The symmetry of the flow and of the governing order parameter equations are shown to be the so…
In this paper a survey is given of the various numerical techniques employed to study the transport of ionising particles inside a TEPC. The first part is devoted to the description of the general concept of particle transport calculations. Thereafter, the different methods available to study transport phenomena and e…
Abstract An equivalent circuit, which extends the Randles model to include coupled chemical steps, is considered for a finite diffusion layer, describing synthetic metals. Information was used, concerning the effect of interaction of solution species on the layer circuit, together with complimentary kinetic parameters…
A new series of gadolinium chelates designed as blood pool contrast enhancing agents for magnetic resonance imaging applications is described. Complexes having four Gd(III) chelate units display a significant increase in molecular relaxivity per gadolinium ion in water (9-13 L x mmol(-1) x (s-1) compared to Gd(III)-DT…
Abstract The vapour pressure of thermally stable substances can be determined easily at ambient pressure using the evaporation rate method. It is possible to measure the evaporation by thermogravimetry in the temperature range from 30°C to 800°C. Vapour pressures as low as 10 −10 Pa (10 −12 mbar) can be determined wit…
Abstract The kinetics and mechanism of the thermal reduction of NO by H 2 have been investigated by FTIR spectrometry in the temperature range of 900 to 1225 K at a constant pressure of 700 torr using mixtures of varying NO/H 2 ratios. In about half of our experimental runs, CO was introduced to capture the OH radical…
The role of disorder on the inhomogeneous and homogeneous linewidths of ${\mathrm{Eu}}^{3+}$ in single crystals with various degrees of disorder is described for samples grown by LHPG (laser-heated pedestal growth). Emission spectra, hole-burning spectra, and results of the two-pulse photon echo are reported for ${\ma…
Abstract The surface/near-surface chemistry of allophane has been studied by X-ray photoelectron spectroscopy (ESCA) and the bulk material by 27 A1 and 29 Si solid-state NMR and other techniques. The surface/near-surface Si/Al ratio of allophane is c. 1.0, similar to that for kaolinite, zeolite Na-A and sodalite. The…
Controlled atmosphere electron microscopy has been used to gain a unique insight into the manner by which various additives interact with carbonaceous solids, particularly graphite. With this technique it is possible to observe directly, at the nano-scale level, changes taking place in the appearance of a solid while…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic field effects in the radical ion pair recombination of fixed-distance triads consisting of porphyrins and an electron acceptorUdo Werner, Yoshio Sakaguchi, Hisaharu Hayashi, Go Nohya, Ryusho Yoneshima, Satoshi Nakajima, and Atsuhiro OsukaCite this: J. Phys. Chem. 19…
Phase relationship in the [(K 1/2 Bi 1/2 ) 1- y (Na 1/2 Bi 1/2 ) y ](Ti 1- x B x )O 3 system with B=Zr, Fe 1/2 Nb 1/2 , Zn 1/3 Nb 2/3 or Mg 1/3 Nb 2/3 has been investigated by dielectric measurement and X-ray diffractometry. All of the bi-binary systems were solid-soluble throughout the entire composition range. With…
$^{57}\mathrm{Fe}$ M\"ossbauer studies were carried out on the ${\mathrm{Dy}}_{0.73}$${\mathrm{Tb}}_{0.27}$${\mathrm{Fe}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ni}}_{\mathit{x}}$ and ${\mathrm{Ho}}_{0.85}$${\mathrm{Tb}}_{0.15}$${\mathrm{Fe}}_{2\mathrm{\ensuremath{-}}\mathit{y}}$${\mathrm{Ni}}_{\mathit{y}}$ sy…
OBJECTIVE: To investigate the impact of obesity, fat distribution and weight loss on collagen turnover using serum concentrations of the carboxyterminal propeptide of type I procollagen (S-PICP) and the aminoterminal propeptide of type III pro-collagen (S-PIIINP) as markers for collagen turnover. DESIGN: Blood samples…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonte Carlo Simulations on the Stereoregularity, Crystallinity, and Related Physical Properties of Poly[methyl-(3,3,3-trifluoropropyl)siloxane]Tarek M. Madkour and J. E. MarkCite this: Macromolecules 1995, 28, 20, 6865–6870Publication Date (Print):September 1, 1995Publicatio…
Polarization-selective gratings in the resonance domain of diffractive optics are calculated by use of rigorous electromagnetic diffraction theory. The polarizing effects are attained by special surface-relief structures, and the profile of binary surface-relief gratings is optimized with a nonlinear Newton algorithm…
Abstract Kusachiite, CuBi 2 O 4 , has been found in a calcite vein cutting gehlenite-spurrite skarns at Fuka, Okayama Prefecture. It is associated with calcite, henmilite, sillenite, bakerite, tenolite, bultfonteinite, apophyllite, cuspidine and thaumasite. Kusachiite occurs as prismatic crystals or globular aggregate…
X-ray scattering studies on a homologous series of thermotropic liquid crystals with one tail perfluorinated reveal that the smectic layer thickness depends only on the length of the fluorocarbon tail. Density measurements in combination with the x-ray results show that the average cross-sectional area per molecule, p…
Reaction of pyridine with 1-bromoalkanes leads to N-alkylpyridinium bromides which can be further reacted with silver dodecylsulphate to give N-alkylpyridinium dodecylsulphates in good yield. These salts are mesomorphic and their mesophases have been characterized by optical microscopy, DSC and X-ray scattering techni…