Materials Literature
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Tight-fit cloth pressure provides important clue on how well a cloth fits to a body and thus on how comfortable the wearer feels with the cloth. Traditionally-used pressure sensor devices are expensive, sensitive to the experimental environment, and difficult to reproduce. In this paper, a physically-based cloth simul…
A new multiphase Eulerian model for columnar and equiaxed dendritic solidification has been developed. The mean conservation equations are derived by means of a statistical phase averaging technique, and the mathematical formulation of the model can be used for both columnar and equiaxed solidification. The model uses…
Gut geschüttelt: Die Tensidkonzentration genügt, um eine doppelte Phaseninversion bei Emulsionen auszulösen, die durch eine Mischung aus Silica-Nanopartikeln und einem kationischen Zweikettentensid stabilisiert werden. Im Bild sind Emulsionen von Dodecan und Wasser zu sehen, die durch Silica-Nanopartikel (links, insta…
Ammonia transfer from the glutamine site to the fructose-6P site of bacterial glucosamine-6-phosphate synthase was studied by molecular dynamics simulations. The studies suggest a key role for Trp74, in the sealing of the hydrophobic channel connecting the two binding sites, as well as for the two Ala602 and Val605 re…
Effects of microwave irradiation on the dehydriding reaction of the composites of LiBH4 and a microwave absorber such as TiH2, B, or C were experimentally investigated. The composites with TiH2 exhibited faster temperature increases than pure LiBH4; however, they took more than 30min to release hydrogen. In contrast,…
The evolution of the averaged local density of states at the impurity site with increasing the impurity concentration is studied by the cluster expansion method for the self-energy. It is demonstrated that the general shape of the local density of states and the decrease rate of the resonance peak height undergo a qua…
Ferroelectric crystals near the morphotropic phase boundary (MPB) in the Pb(Mg1∕3Nb2∕3)O3–PbZrO3–PbTiO3 ternary system were grown using the solid state crystal growth technique. A MPB composition with a Curie temperature of ∼205°C was selected for characterization of the piezoelectric properties and temperature depend…
Magnetotransport properties of strained La0.65Ca0.35MnO3 thin films with thickness between 10 and 1000nm were investigated at temperatures near the metal-insulator transition and in magnetic fields up to 0.7Tesla. The reduction of the thin film thickness, which in turn produces an increasing epitaxial lattice strain,…
Various characteristics of the high-temperature thermoluminescence (HTTL) in the glow curve of LiF:Mg,Ti (TLD-100) are reviewed. The proposed applications of the HTTL to mixed-field radiation dosimetry are outlined with special emphasis on the question of the linearity/supralinearity of the HTTL dose-response at low d…
Using molecular dynamics simulations the authors impose a heat flux between single-walled carbon nanotubes and air to study thermal interfacial conductance. They estimate that the nanotube-air interfacial thermal conductance is about 0.1MW∕m2K at room temperature and atmospheric pressure. The associated interfacial th…
Intense 1.8 µm and efficient 1.47 µm infrared emissions have been recorded in Tm3+-doped alkali–barium–bismuth–tellurite (LKBBT) glasses with lower phonon energies under the excitation of a 792 nm diode laser. The maximum emission cross-sections for the 1.8 and 1.47 µm emission bands are derived to be 6.643 × 10−21 an…
We describe a model for the structures of randomly hyperbranched polymers in solution, and find a logarithmic growth of radius with polymer mass. We include segmental overcrowding, which puts an upper limit on the density. The model is tested against simulations, against data on amylopectin, a major component of starc…
Parsons-Lee and Onsager theories are formulated for the isotropic-nematic transition in a binary mixture of hard rods and hard spheres. Results for the phase coexistence and for the equation of state in both phases for mixtures with different relative sizes and composition are presented. The two theories explain corre…
Using first-principles methods, we have systematically calculated the defect formation energies and transition energy levels of group-III and group-V impurities doped in H passivated Si quantum dots (QDs) as functions of the QD size. The general chemical trends found in the QDs are similar to that found in bulk Si. We…
Using a water-in-oil microemulsion with cetyl trimethyl ammonium bromide as the surfactant, iron was reduced to form a metallic core on which a passivating oxide shell was grown. Transmission electron microscopy, vibrating sample magnetometry, and heating measurements were used to characterize these monodispersed magn…
SiC nanobelts have been synthesized by a reaction of Si and CNTS without catalysts using the simple evaporation method. The nanobelts display a unique bicrystalline structure that has growth directions, i.e. and , splitting along the twin boundary that exists at the centreline. The width of the nanobelts is in the ran…
We have reported the growth of p-type As-doped ZnO nanorod (NR) arrays and their electrical and electroluminescence (EL) properties. Well-directed ZnO NR arrays were grown on the Si substrate. The GaAs wafer was employed as an arsenic resource. Thermal anneal was performed to diffuse an As element into a ZnO NR. The A…
Gold–polymethylmethacrylate (PMMA) nanocomposites were fabricated with a photoreduction method using UV irradiation. The irradiated samples are compared with unirradiated ones to investigate the mechanism of gold nanoparticle formation and the effect of UV irradiation and polymer matrix on the morphology of the partic…
A study on oxygen-plasma treatment of ink-jet paper is presented. Paper was exposed to a weakly ionized, highly dissociated oxygen plasma with an electron temperature of 5?eV, a positive-ion density of 8 ? 1015?m?3 and a density of neutral oxygen atoms of 5 ? 1021?m?3. Optical emission spectroscopy (OES) was applied a…
Lead-free (K0.46−x∕2Na0.54−x∕2Lix)(Nb0.76Ta0.20Sb0.04)O3 piezoelectric ceramics were prepared by the conventional solid state sintering method without cold-isostatic pressing process. The x-ray diffraction and Raman scattering results show that the phase structure of the ceramics undergoes a transition from pseudocubi…