Materials Literature
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Abstract A new family of bioabsorbable materials suitable for biomedical applications was designed and prepared by means of blending of some available polyesters to develop new biodegradable materials tailored for different requirements. Multiphase polymer blends containing poly( d, l ‐lactide) (PLA), poly(ε‐caprolact…
Using neutron scattering, we have studied the effect of an applied magnetic field on the nematic-isotropic transition temperature ${T}_{c}$ in para-azoxy-anisole (PAA). We have, for the first time, been able to measure a thermal hysteresis width, $({T}_{+}^{*}{\ensuremath{-}T}_{\ensuremath{-}}^{*}){/T}_{c}$, and find…
Detailed measurements of the X-ray scattering from a 400 AA thin film of Nb grown on sapphire have been performed using synchrotron radiation from a bending magnet. Bragg reflections from Nb planes perpendicular to the surface normal have a two-component lineshape: a sharp, essentially resolution-limited peak, superim…
Highly textured strontium barium niobate thin films were deposited in situ by low pressure metalorganic chemical vapor deposition. [001]-oriented strontium barium niobate films on single crystal (100) magnesium oxide substrates were obtained at a growth temperature of 800 °C. Second-harmonic generation of 1.064 μm inc…
Tungsten oxide films were made by magnetron sputtering with a large angle between the substrate normal and the direction of the deposition flux. Scanning electron microscopy displayed a microstructure composed of inclined columns. Spectrophotometric measurements on films with different amounts of electrochemically int…
The electron paramagnetic resonance (EPR) spectrum of the neutral phosphorus vacancy has been observed in as-grown ZnGeP2 during illumination at liquid-helium temperatures. Without illumination, this donor is a nonparamagnetic singly ionized phosphorus vacancy (VP+ center). Either above-band-gap light (514.5 nm) or be…
The dynamical behavior of nematic and smectic- $A$ ordering of a liquid crystal in an aerogel host is studied by quasielastic light scattering. In the nematic phase, ordered domains are comparable to the pore size and generally frozen in orientation, with remnant orientation fluctuations having paranematic dynamics fo…
All-perovskite ferroelectric field effect transistors (FET) are proposed, and switching behaviors of the prototype devices having a (Pb,La)(Zr,Ti)O3 as a gate insulator and a La1.99Sr0.01CuO4 as a channel layer were demonstrated. Marked improvements in device performances were obtained as compared with the previous fe…
Abstract Recent studies of foam-diversion processes for matrix acidization identify gas trapping during post-foam liquid injection as the key to foam effectiveness. Laboratory studies identify two degradation processes during this period: a rapid increase in mobility throughout the core, followed by a slower further r…
The corrosion behaviour of two superferritic stainless steels, both containing varying amounts of ruthenium, was evaluated and compared in a 10% sulphuric acid solution. It was found that small additions of ruthenium increased the corrosion resistance in both types of alloys dramatically. Apart from raising the corros…
Calculation of flux distribution in three‐phase three‐limb transformer core has been made using 2D finite element method. The calculation has been performed with and without taking into account lthe hysteresis of magnetic material. Anisotropy of magnetic material has been modelled through the so‐called elliptic permea…
Paraphenylenediamine and diphenylamine were chemically attached to natural rubber during mastication. The rubber bound antioxidants were characterized by TLC, 'H-NMR, IR and TGA. The efficiency and permenance of these bound antioxidants were compared with a conventional amine type antioxidant in filled natural rubber…
Abstract A new model is presented to predict the cumulative breakup time of the jet from a shaped charge liner. The model invokes a plastic instability criterion, kinematic considerations, and a material constitutive equation. Very good agreement of the cumulative breakup time and jet length with experimental data for…
The Co substitution effect on the magnetostrictive properties of DyFe 2 has been investigated using magnetic measurement. The specific saturation magnetization σ s of the Dy(Fe 1- x Co x ) 2 compounds firstly decreases with x and then increases. The magnetostriction constant λ t of these compounds increases with x mon…
Abstract Three series of poly(alkylene glycol) diacrylates, namely poly(ethylene glycol), poly(propylene glycol) and poly(tetramethylene glycol) α,ω‐diacrylates have been prepared by acryloylation of the corresponding bis‐OH‐terminated oligomers. Their MW was in the range 200–1000 and their acrylic functionality was c…
Chemical transformations occurring during melt processing of polymers such as polyethylene are described in terms of kinetics of relevant reactions. A model is developed which takes into consideration; chemical, thermal, and mechanical effects, autocatalitic reactions, as well as the role of inhibitors. The calculated…
In the low-frequency regime, the Raman spectrum of most glasses is dominated by a strong broad line which is usually called the Boson peak. The physical origin of this peak is still a matter for discussion. Several attempts have been made in order to connect the Boson peak to the vibrational density of states. Various…
El‐Farafra depression is a huge sandy landscape interlayered with gray and red shale deposits of clay texture (clay content 72% for gray shale and 56% for red shale), suggesting their possible suitability as soil conditioners. Mineral assemblages of the clay fraction of both shales included interstratified minerals, s…
1,3,4-thiadiazole bisdisulfides inhibit copper corrosion by active sulfur in lubricating oils. They react with active sulfur to yield inactive trisulfides as determined by Raman spectroscopy and Mass spectroscopy (MS). The thiadiazole bisdisulfide also reacts to form a protective film on the surface of a copper strip.…
Oxidation tests of irradiated and un-irradiated rod with an artificial defect hole were Per-formed in air and air-argon mixed gas between 473K and 513K to study the oxidation behavior of damaged fuel rod during dry storage. Rods oxidized in air showed diameter in-crease due to volume expansion caused by the generation…