Materials Literature
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Structural and electronic properties as well as the stability of MoS2 nanotubes are studied using the density-functional-based tight-binding method. It is found that MoS2 zigzag ( n,0) nanotubes exhibit a narrow direct band gap and MoS2 armchair ( n,n) possess a nonzero moderate direct gap. Interestingly, the ( n,n) t…
Electronic structure of deformed carbon nanotubes varies widely depending on their chirality and deformation mode. We present a framework to analyze these variations by quantifying the dispersion relation and density of states. The theory is based on the Huckel tight-binding model and confirmed by four orbital tight-b…
Small organic gelling agents very efficiently self-assemble into an entangled network in a wide variety of organic solvents, thereby turning the liquid into a gel. Recent progress in the design of organogelators led to tailor-made gelling agents for supercritical CO2. Furthermore, such agents can be used as templates…
The most stable molecular packing systems of aromatic polyester molecules have been investigated by molecular dynamics (MD) simulations performed for decamer (ten repeating units) of p-hydroxybenzoic acid (HBA) in the nematic phase. The MD simulations were started from eight possible packing structures. Among them, we…
In this article, we report silicon-based multilayered nanometer-size wires for vertical metal oxide semiconductor field effect transistor (MOSFET) and the ohmic contact of gallium nitride (GaN) field effect transistor (FET) were milled to produce trenches with a micron-scale rectangular area for a subsequent inspectio…
The aromatic copolyester of 4-hydroxybenzoic acid (HBA) and 6-hydroxy-2-naphtoic acid (HNA) shows strong SHG-activity in the nematic phase as well as the crystalline phase in spite of no absorption in the visible region. Ab initio quantum chemistry calculations of the copolyester have been carried out in order to clar…
We present the structural, magnetic and electrical properties of some manganese oxides such as Ln0.5M0.5MnO3 (Ln = La, Pr and M = Ca, Sr, Ba) in which the average ionic radius <rA> of the A site cation is varied while keeping the Mn3+/Mn4+ ratio fixed to 1. All the studied samples have a perovskite structure with rhom…
Mathematical grey interrelation analysis method was used to study the correlation of alloy elements and low steel corrosion in the splash zone. Eighteen kinds of low alloy steels were selected for 350-day experiments in a large marine corrosion environment simulating apparatus. The analysis results showed that the cor…
The orientational transition process of p-pentyl-p'-cyano-biphenyl (5CB) liquid crystal monolayers at the air-water surface during monolayer compression and the cis-trans photoisomerization process of surface azobenzene monolayer were examined using the Maxwell displacement current measurement. Using this measurement,…
The electron paramagnetic resonance (EPR) and dielectric properties of Pb5Ge3O11 crystals activated by copper ion are investigated. It is shown that Cu2+ ions replace Pb2+ in trigonal symmetry positions and occupy three off-center positions displaced from a crystal lattice site in a plane perpendicular to the polar ax…
Rheological properties (melt flow index and melt stability), mechanical properties (tensile strength, flexural strength and impact) of polyamide (PA6) polypropylene (PP) blends were investigated. Influence of potential compatibilizors: 4,4′-diphenyhnethane carbodiimide (OCDI), 4,4′-diphenylmethane bismaleimide (BMI) a…
This paper describes in detail a new concept of producing super light weight (0.24-0.26 g/cm 3 ) polyurethane (PU) midsoles to compete with EVA for sports shoes. Materials for the midsole of the dual density sport shoes are composed of PU or EVA. Though PU midsole has good cushioning (resilience), adhesive and process…
Abstract Transmission electron diffraction patterns from ultra-thin aromatic and aliphatic organic films at beam energies of 200 eV–1 keV have been recorded in a custom low energy electron transmission (LEET) chamber. A significant reduction of the molecular damage cross-section, measured by fading of diffraction spot…
The effect of processing on the mechanical properties of Sigma 1140+ SiC fibres was studied through tensile tests carried out on pristine Sigma 1140+ SiC fibres and on fibres extracted from a Ti-6A1-4V-matrix composite. The elastic modulus and the tensile strength were computed after measuring carefully the fibre diam…
The authors present a new static hysteresis model for magnetic materials based on physical meaning. The idea is original: electronic transformation of the material is compared to a chemical reaction. Then a simple analytic formulation of the B(H) law for GO iron sheet in the rolling direction is obtained. Results are…
The design of a transformer should consider the analysis of the load variation. This paper describes the current wave calculation when the load condition varies for the newly proposed two-dimensional model in previous work, which can reflect the three-dimensional effects such as air gap and overlapped stacking. The an…
Fluorine-doped CdO thin films were deposited by spray pyrolysis from a solution of cadmium acetate in distilled water and methanol. The films were doped by addition of NH4F to the starting solution. The transmittance spectra corresponding to samples deposited with different concentrations of NH4F and different deposit…
Abstract Two reduced‐scale closed oil cycles are used to investigate the influence of both the cathodic protection of a pipeline and its proximity to AC power transmission lines on the oil‐flow electrification (OFE). For the former case, the results reveal that the OFE is highly dependent on the magnitude of the prote…
Structural and magnetic properties of the two-layered Ruddlesden–Popper phase SrO(La1−xSrxMnO3)2 with x=0.3–0.5 are highlighted. Intrinsic properties of these naturally layered manganites include a “colossal” magnetoresistance, a composition-dependent magnetic anisotropy, and almost no remanence. Above the Curie tempe…
Operation of any semiconductor device can be presented by unique configuration of the electrical field (potential) and charge (doping) distribution within the device. More specifically, the status of operation is described by the quasi-Fermi energy (QFE) profile across the device. Visualization of the dynamic operatio…