Materials Literature
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The correlation between electron field-emission properties of diamond films prepared by the chemical vapor deposition (CVD) process and the defect structure induced by boron doping was examined. Secondary ion mass spectroscopic analysis indicates that the solubility limit of boron in diamond is (B3+)2=5×1021 cm−3, whe…
Hemicelluloses, extracted from the delignified poplar chips with 8.0% NaOH-1.0% Na2B4O7-10H2O, were esterified with various acyl chlorides in the homogeneous N,N-dimethylformamide/lithium chloride system. Comparative reactions were performed with different molar ratios of acyl chloride/anhydroxylose, different concent…
For a series of side-chain liquid crystalline (LC) diblock copolymers we have investigated the overlap of liquid crystalline and morphological phase behaviors. LC thermal transitions were identified using polarized optical microscopy combined with calorimetry. Order−disorder and order−order transitions (ODT's and OOT'…
OBJECTIVE: Evaluation of the pharmacokinetic behavior of gadobenate dimeglumine, a new multipurpose parenteral contrast agent for magnetic resonance imaging. METHODS: The pharmacokinetics were evaluated in rats, rabbits, dogs and monkeys after intravenous injections of non-labelled gadobenate dimeglumine and, for biod…
Moving light-emitting diodes are envisioned as a possible application of the work presented here. Microfabricated bilayer hinges of polypyrrole (PPy) and gold are used to rotate and position silicon plates. This is achieved by electrochemically altering the oxidation state of PPy, thus causing a significant volume cha…
In this report, a comparative study of physical properties of the multilayered ZnO:Al films prepared by a combination of RF and DC magnetron sputtering is presented. It has been found that a RF/DC/DC trilayered system consisting of a thin RF-sputtered ZnO:Al bottom layer with two identical DC-sputtered ZnO:Al layers d…
Abstract Gum and black-filled vulcanizates of styrene-butadiene rubber (SBR) and natural rubber (NR) were prepared. Strengths in uniaxial tension were determined for specimens with and without edge-cuts. Normal tensile strengths (no cut) of the gum NR, filled NR and filled SBR were similar; whereas, with pre-cuts, eve…
Molecular dynamics simulations for a thin film of water confined to a slit nanopore are performed in order to investigate the dynamic process of crystallization of the system. The system upon freezing creates a bilayer ice crystal composed of two layers of hexagonal rings. We perform one simulation at T=257 K during w…
Artificial superlattices of ${\mathrm{LaFeO}}_{3}{\ensuremath{-}\mathrm{L}\mathrm{a}\mathrm{M}\mathrm{n}\mathrm{O}}_{3}$ were formed on ${\mathrm{SrTiO}}_{3}(111),$ (100), and (110) substrates with various stacking periodicity using a pulsed laser deposition technique, and their magnetic properties were controlled by…
Gold colloids coated with a self-assembled monolayer of an alkanethiol were introduced into a polyethylene matrix by means of solution-casting techniques. We oriented the resulting nanocomposites by uniaxial drawing in the solid state. The absorption spectra of the drawn nanocomposites in the visible wavelength region…
The influence of boric acid (H3BO3) additions to sulfuric acid (H2SO4) were examined for the anodizing of Al 2024-T3 (UNS A92024) and Al 7075-T6 (UNS A97075) alloys at constant voltage. Alloys were pretreated by electropolishing, by sodium dichromate (Na2Cr2O7)/H2SO4 (CSA) etching, or by alkaline etching. Current-time…
It has recently been shown that the standard deviation of local r.m. s. electron density is a good indicator of the presence of distinct regions of solvent and protein in macromolecular electron-density maps [Terwilliger & Berendzen (1999). Acta Cryst. D55, 501-505]. Here, it is demonstrated that a complementary measu…
To examine the porphyrin-core expansion and the conformational variations induced by a change in the coordination sphere of nickel(II) from four-coordinate, low-spin (S = 0) to six-coordinate, high-spin (S = 1), several nickel(II) derivatives of tetraphenylporphyrins, substituted in their beta-pyrrole positions with e…
The optical properties of KLa(MoO4)2 crystals doped with Nd3+ are investigated at temperatures in the range 10–300 K. The spontaneous transition probabilities, the branching ratios, and the radiative lifetime are calculated in the framework of the Judd–Ofelt theory and compared with the experimental results for the 4F…
ß‐Si 3 N 4 crystals were obtained through the heat treatment of alpha‐Si 3 N 4 powder with additives, Y 2 O 3 :SiO 2 = 1:2 and 2:1, and subsequent acid treatments that removed the secondary phases. The lattice oxygen contents of these crystals were determined by the hot‐gas extraction method to be 0.258 ± 0.006 and 0.…
In the first part of this study we described the process of destabilization of foam films by mixed (silica−silicone oil) antifoam drops as observed with a high-speed video camera. The drops formed oil bridges, which stretched with time and eventually ruptured the foam films. Remarkably, two types of bridges could be d…
Eutectic gallium-indium is studied in a horizontal Bridgman furnace geometry. Differential temperature gradients are applied to solidify and melt the alloy while observing in-situ the interface morphology and the chemical segregation in the melt and in the solid as well. Upon cooling, a wedge-type indium-rich mushy zo…
Room-temperature recrystallization (self-annealing) of electroplated copper (Cu) films is investigated using three kinds of seed/barrier layers with nontexture and (111) texture. The as-plated films have almost the same texture as the seeds. The texture changes during self-annealing depend on the seed texture. The (11…
Cyclotella meneghiniana was collected from an artificial pond Kosharskij near Feodosia, Crimea, isolated and cultured under different conditions (freshwater, 2‰, 4‰, 8‰, and 16‰ salinity). Detailed light- and electron microscope investigations were made of specimens from monoclonal cultures of C. meneghiniana and comp…
Intrinsic GaAs single crystals were deformed under hydrostatic pressure at temperatures down to 130K. Slip lines indicate that, below 300 K, deformation occurs by ½ ⟨101⟩{111} slip with frequent cross-slip. Above 300 K the crystal is so brittle that no slip lines are observed and the critical resolved shear stress τ c…