Materials Literature
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An analysis is made of the behavior of optical spectra of lead-silicate glasses, with variable lead content near the UV absorption edge, and within the 80–470-K range. A generalized formulation of the modified Urbach rule, applicable to glassy materials within a broad temperature range, is proposed for the interpretat…
Molecular-dynamics simulations of the glass former ${\mathrm{Ca}}_{0.4}{\mathrm{K}}_{0.6}{(\mathrm{N}\mathrm{O}}_{3}{)}_{1.4}$ (CKN) have been performed with a polarizable model for the nitrate ion. Polarization effects in the anion were included with a fluctuating charge model. Comparison of the Ca-Ca partial radial…
Fourier transform (FT)-Raman spectroscopy and FT surface-enhanced Raman spectroscopy (FT-SERS) are applied for the first time to study the chemical oxidative changes undergone by caffeic acid (CA) in solution and when adsorbed on silver colloids. UV-visible spectroscopy was also applied to follow the polymerization of…
Wittite and cannizzarite, two rare and structurally related nonstoichiometric sulfosalts belonging to the system Pb‐Bi‐S‐Se, were found together around high-temperature fumaroles at La Fossa crater, Vulcano island, Italy. This occurrence makes a comparative study by different methods possible (scanning electron micros…
In previous kinetic studies of Escherichia coli aspartate aminotransferase, it was determined that some substitutions of conserved cysteine 191, which is located outside of the active site, altered the kinetic parameters of the enzyme (Gloss,L.M., Spencer,D. E. and Kirsch,J.F., 1996, Protein Struct. Funct. Genet., 24,…
Esters of cellulose with trifluoroethoxy acetic acid (TFAA) were prepared in homogeneous phase using a mixed anhydride with p-toluenesulfonic acid. Esters with low degree of substitution (DS), and with DS rising from 0 to 3, had hydrophobic character that prevented the usual association with moisture, which is otherwi…
Photopyroelectric measurements of the anisotropy in the thermal conductivity Deltak vs temperature in the nCB (n=5,ellipsis,9) series are reported. The data have been used to deduce the behavior of the orientational order parameter Q close to the nematic-isotropic (N-I) and smectic A-nematic (A-N) phase transitions, r…
Dose dependent structural modifications in Si(100) due to 1.5 MeV implantation of Sb have been characterized using Raman spectroscopy and Rutherford backscattering spectrometry/channeling (RBS/C) techniques. With increasing fluence, an intensity reduction of the first order Raman peak, characteristic of crystalline Si…
Methods for synthesizing bistolane liquid crystal materials with lateral methyl and ethyl substituents are presented. Some of the bistolanes are nematic at room temperature. These highly conjugated mesogens exhibit wide nematic ranges, small enthalpies of fusion, high birefringence and modest viscosity. Their potentia…
The single‐edge V‐notched‐beam fracture testing method was used to measure the short‐crack R ‐curve behavior of a 90‐vol%‐alumina–10‐vol%‐ceria‐doped zirconia multilayered composite. The initiation and extension of short cracks from the V‐notch tip were observed in situ via optical microscopy. Initial crack lengths of…
Seven homologous imidazoline type inhibitors were synthesised, all being derivatives of cyclopentyl- and cyclohexylnaphthenic acids. The protective effectiveness of these compounds was investigated by applying the potential sweep method to the carbon steel St3S and austenitic steel 1H18N9T in a 2% solution of sodium c…
The density of states is studied for periodic and open boundary conditions in the vertex model of the Penrose tiling. For one gap in the spectrum the gap labeling is done explicitly. Localization of wave functions is studied by $2p$ norms in a series of approximants for one value of the energy by means of a contour in…
The magnetostriction measurements of almost stoichiometric single crystalline Ni _2 MnGa compound with T_m<T_C ( T_m and T_C are the martensitic and ferromagnetic transformation temperatures respectively) at constant temperatures have been performed in a temperature range of 100--400 K. The measurements resulted in…
The influence of ammonium chloride (NH 4 Cl) on the rheological properties and sedimentation behavior of aqueous silica (SiO 2 ) suspensions of varying solids volume fraction (φ s ) was studied. SiO 2 suspensions with low NH 4 Cl concentration (≤0.05 M , pH 5.2) exhibited Newtonian behavior and a constant settling vel…
Using high-energy synchrotron radiation, structure factors were measured on the triple-axis diffractometer at the HASYLAB beamline BW5. A data set for cuprite, Cu 2 O, was recorded, and the excellent data quality [internal consistency R int ( F 2 ) = 0.0055] allowed full multipole refinements using the program VALRAY…
Application of time correlated single photon counting to pulsed Mie scattering enables one to resolve changes in light scattering to better than 50 ps. This technique is applied to the highly nonlinear motion of a sonoluminescing bubble. Physical processes, such as outgoing shock wave emission, that limit the interpre…
Sequence analysis of the recently identified class I aldolase of Escherichia coli (dhnA gene product) helped to identify its homologs in Chlamydia trachomatis, Chlamydiophyla pneumoniae and in each of the completely sequenced archaeal genomes. Iterative database searches revealed sequence similarities between the DhnA…
A thermodynamic description of the Cr-Ti system is obtained by the optimization of the available thermodynamic and phase diagram data. The Redlich-Kister polynomial is used to describe the excess Gibbs energies of the liquid, bcc and hcp phases. The sublattice model is used to describe the different types of Cr 2 Ti L…
Crystalline orientation often provides particularly the anisotropy of chemical and physical properties. Since the epitaxial films are composed of highly oriented crystals, it is expected that chemical and physical advantages are predominantly in one specific direction. In this study, high-rate epitaxy of anatase films…
The internal friction (IF) and the Young’s modulus of SrBi2Ta2O9 (SBT) ceramics were measured by using the reed vibration method in the temperature range from 100 to 600 K with kilo-hertz frequencies. A high IF peak associated with a modulus defect appeared around 500 K, which was assumed to be due to the migration of…