Materials Literature
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In this paper, we prove that solutions of the anisotropic Allen--Cahn equation in double-obstacle form with kinetic term \begin{displaymath} \varepsilon \beta(\nabla \varphi) \partial_t \varphi - \varepsilon \nabla A'(\nabla \varphi) - \frac{1}{\varepsilon} \varphi = \frac{\pi}{4} u \quad \mbox{ in } [|\varphi| < 1],…
Abstract Base catalized intermolecular cyclization of 2‐amino‐3‐chloro‐5,6‐dicyanopyrazines gave 5,10‐disubsti‐tuted‐2,3,7,8‐tetracyano‐5,10‐dihydrodipyrazino[2,3‐ b :2′,3′‐c]pyrazines 11–20. These compounds have rather small molecular size but have strong intramolecular charge‐transfer chromophoric system. They have…
Cu lines 0.25 μm wide are successfully patterned by high-temperature dry etching without sidewall protection of the deposited films. Use of Cl2 gas as a single reactant rather than a mixture of gaseous chlorine compounds is the key to this anisotropic etching. This reactant suppresses the side etching of Cu patterns w…
The growth and morphology of crystals of hard colloidal spheres is monitored by a special photographic technique. Crystals are observed to grow in size and increase in number density, initially. This is followed by a decrease in size and an increase to saturation in the number density. During the growth stage the crys…
BEDT-TTF is the donor of the highest T c organic superconductors. Isotopic shift experiments support an electron−phonon coupling mechanism for the superconductivity. However, the vibrational levels have been only partially observed and assigned, making testing of this mechanism difficult. In order to provide a complet…
The internal structure (the monomer density profiles) of weakly charged polyelectrolyte brushes of different morphologies has been analyzed on the basis of the self-consistent-field approach. In contrast to previous studies based on the local electroneutrality approximation valid for sufficiently strongly charged or d…
The packing of cylindrical particles with log‐normal and modified power‐law length distributions has been experimentally studied. The results indicate that the packing density is heavily dependent on the parameters in the two distributions. However, this dependence cannot be predicted by the direct analogy to that for…
The water uptake of nominally 5%‐Yb‐doped strontium zirconate (SrZr 0.95 Yb 0.05 O 3−α ) was studied in situ by thermogravimetry at different temperatures and water vapor pressures. The process could be described in terms of an ideal solution behavior, showing a lower effective vacancy concentration than that expected…
An efficient first-order algorithm with an exact calculation of the gradients is described and applied to the refinement of inhomogeneous dielectric thin films. Numerical results calculated at normal and oblique angles of incidence are correlated with an important mathematical theorem. It is shown that, when appropria…
The authors present a robotic system incorporating vision and force/torque sensing for handling flat textile materials and describe the results of experiments to measure the accuracy and reliability of the system for a variety of representative handling tasks for textile materials.
The aliphatic double bond of poly(2-cinnamoylethyl methacrylate) (PCEMA) displayed a characteristic surface-enhanced Raman scattering (SERS) peak at 1640 cm -1 . Polystyrene (PS), together with the phenyl rings of PCEMA, contributed to the peak at 1005 cm -1 . We determined the intensity ratio of these two peaks, i.e.…
The effect of flexible spacer length on the phase transitions and mesophase structures of main-chain thermotropic liquid-crystalline polyesters having bulky pendent side groups was investigated using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and polarizing optical microscopy (POM).…
DSC measurements have been performed on the monomeric form of yeast hexokinase B in the absence and presence of increasing concentrations of D-glucose. The hexokinase, in the absence of D-glucose, at both pH 8.0 and 8.5, shows reproducible calorimetric profiles characterized by the presence of two partially overlapped…
Abstract: Complex permeability spectra @*=p&apos;-ip&quot;) in Mn-Zn ferrite and its composite materials have been studied. In sintered ferrite, resonance-type frequency dispersion was observed at room temperature but decrement ofp &apos; is steeper than that of ordinary resonance. As the temperature is de…
The spontaneous microcracking of particulate TiB 2 –SiC composites is studied as a function of TiB 2 volume fraction. The degree of microcracking was examined by measuring elastic properties from room temperature to 1300°C. The results showed that only one composition contains microcracks. All other compositions did n…
The liquid crystalline behaviour of 1-(4-n-decyloxyphenyl)-3-(4-X-phenyl)propan-1,3-diones and their pyrazole and isoxazole derivatives has been studied by optical microscopy, DSC and X-ray techniques. The 4-substituents (X) were chosen to include a range of different polar and non-polar substituents: H, OCH3, Cl, Br…
We have synthesized and studied trisbenzocyclononenes carrying six chiral side chains. They are pyramidic shaped molecules exhibiting columnar mesophases. The optical and electrooptical effects of this chiral pyramidic compound have been studied. A homeotropic alignment of the columnar phase was achieved by cooling th…
To regulate the reactivity of dithiolene dioxomolybdenum(VI) complexes, two systems were studied: (1) chelate recognition with a diamide additive, 1,3-bis(isobutyrylamino)benzene (1); (2) a dithiolene complex with four amide substituents, (n-Pr(4)N)(2)[Mo(IV)O{S(2)C(2)(CONH(2))(2)}(2)].0.5(i-PrOH).DMF (2) (S(2)C(2)(CO…
OBJECTIVE: The main disadvantage of implanted cardiac valve bioprostheses remains primarily tissue failure due to calcification. Coating of bioprostheses with viable autologous endothelial cells may delay or even eliminate tissue calcification and subsequent cardiac dysfunction. METHODS: Glutaraldehyde-preserved Hanco…
Optical and structural properties of chemically deposited CdS films have been characterized by using spectroscopic ellipsometry and electron transmission microscopy. Three representative cases have been studied using grown metastable cubic film and two films annealed at 400 °C (30 min) with and without a CdCl 2 pretre…