Materials Literature
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Aluminum titanate thin films were prepared by ion beam induced chemical vapor deposition (IBICVD). By this method it is possible to control the Al/Ti ratio in the film. Films with Al/Ti≂2 (i.e., a ratio similar to Al2TiO5) were characterized by scanning electron microscopy and transmission electron microscopy, x-ray p…
This paper presents a simple particle plus field model for the dynamics of disclination lines in a nematic liquid crystal. The model has no logarithmic divergences with system size and, therefore, no need to introduce a cutoff. The resulting equation of motion relates the velocity of the disclination to the local phas…
Electron-paramagnetic-resonance (EPR) studies in electron-irradiated diamond enriched with 5% $^{13}\mathrm{C}$ have resulted in identification of the di-〈001〉-split interstitial center. It is the isotopic enrichment and the consequent observation of $^{13}\mathrm{C}$ hyperfine satellites that have permitted the struc…
The characteristic feature of liquid crystal dimers, in which two mesogenic groups are linked by a flexible spacer, is often thought to be the strong odd-even effect exhibited by their transitional properties. That is, the nematic-isotropic transition temperature and the entropy of transition are large for dimers with…
The time to onset of cell opening and the modulus around the event were measured using a parallel-plate rheometer for flexible polyurethane foams. Cell opening time was compared with the visual blow-off time. The onset of cell opening occurs several seconds after phase separation, and the visual blow-off occurs severa…
The finite size effect on the phase transition in PbTiO 3 fine particles is described. Very small crystals with an average diameter of 14.2 nm were obtained by lowering the calcination temperature to 400° C. Raman scattering measurements of such fine particles were carried out to study the dependence of the phase tran…
Summary We analysed the chemistry of solutions collected from soil by zero‐tension plate lysimeters and cup lysimeters connected to a constant suction (600 hPa) under Douglas fir in the Beaujolais mountains (France). The chemistry of zero‐tension lysimeters' (ZTL) and tension lysimeters' (TL) solutions differed enormo…
Poly(3-hydroxybutyrate) (PHB) is well-known as a high molecular weight homopolymer of R-3-hydroxybutyrate which accumulates in storage granules within the cytosols of certain bacteria. Escherichia coli does not amass these granules; however, small amounts of low molecular weight PHB (<0.02% of dry weight) have been fo…
Continuous films of silver(II) oxide (AgO) have been electrodeposited directly from aqueous solutions of 50 m M silver acetate/25 m M sodium acetate onto 430 stainless steel, polycrystalline platinum, and indium‐tin oxide‐coated glass. Current efficiencies for the electrodeposition process ranged from 62 to 95% and we…
The quaternary system Ti‐Al‐C‐N and its binary and ternary boundary systems are investigated using powder methods and XRD analysis. Phase equilibria at 1375°C are presented in an isothermal network for alloys up to 50 at.% Ti. In the vertical section Ti 2 AIC 1‐x ‐Ti 2 AlN 1‐x a complete series of solid solutions exis…
Electrochemical lithium intercalation in VO 2 ( B ) electrodes in aqueous electrolytes has been studied by means of electrochemical methods (such as cyclic voltammetry and constant current discharge and charge) as well as atomic absorption spectrophotometry. Experiments were conducted in various buffer electrolytes ha…
Corrosion inhibition characteristics of four selected S-alkylisothioronium halides on steel in sulfuric acid (H2SO4) media were investigated at 30°C, 40°C, 50°C, and 60°C. The number of active sites on the metal occupied by a molecule of the inhibitor (1/y) and the binding constants (K) of the inhibitor to the active…
Hydrotropy is a solubilization process whereby addition of large amounts of a second solute results in an increase in the aqueous solubility of another solute. Past investigations have focused on the potential interaction of the hydrotropic agent with the solubilized solute. Conversely, this study proposes that at lea…
Titanium surfaces were coated with bovine serum albumin using carbodiimide, a crosslinking agent. The durability of the coated surfaces and the inhibitory effect of the albumin coating on bacterial adherence were tested in vitro for 20 consecutive days at 37 degrees C in phosphate buffered saline, with intermittent ag…
We introduce a method for using dynamic light scattering to measure the frequency-dependent linear viscoelastic moduli of complex fluids. The technique exploits the fluctuation dissipation theorem, which relates the relaxation of thermal excitations of a probe particle to the viscoelastic properties of the surrounding…
The behaviour of mode I cracks in -Fe is investigated using molecular statics computer simulation methods with an EAM potential. A double-ended crack of finite size embedded in a cylindrical simulation cell and fixed boundary conditions are prescribed along the periphery of the cell, whereas periodic boundary conditio…
Abstract Layered bimetallic gold‐palladium colloids in the size range of 20–56 nm have been synthesized by the seed=growth method: gold seeds were covered by palladium layers of various thickness and vice versa. The outer metal was coordinated by trisulfonated triphenylphosphine and sodium sulfanilate ligands to stabi…
Distributions of wave fields in three-dimensional domains are analyzed, synthesized, and generated experimentally. Fundamental limits are discussed and sampling conditions are derived for their generation, with use of a single diffractive element. A general design procedure, based on optimization algorithms, is develo…
We present a detailed analysis of magnetoresistance in tetragonal thin films of ferromagnetic ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{\ensuremath{\delta}}$ grown by atomic layer-by-layer molecular-beam epitaxy. The field and temperature dependence of the resistivity $\ensuremath{\rho}$ show an…
Encapsulation of platinum-group metals (Ru, Rh, Pd, Os, Ir, Pt) within carbon nanocapsules and synthesis of single-layered (SL) carbon nanotubes by arc evaporation of metal/carbon composites have been studied. Transmission electron microscopy revealed that all the platinum-group metals, forming small particles (10–200…