Materials Literature
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A few unique buckling and postbuckling characteristics of short superelastic shape memory alloy (SMA) columns are observed experimentally and explained in terms of numerical simulation. Interestingly, it is found from the load-deformation curves that during compression the SMA column with slenderness ratio ( ) k L of…
Presently, solar cells are covered with Ce-doped microsheet cover glasses that are attached with Dow Corning DC 93500 silicone adhesive. This general approach has been used from the beginning of space exploration, however, it is expensive and time consuming. Furthermore, as the voltage of solar arrays increases, signi…
The development of a novel reactive unsaturated interfacial modifier for filled (magnesium hydroxide, aluminium hydroxide and calcium carbonate) polyolefins is reviewed. Initial work explored maleimide functional candidate molecules including 1,3-phenylene dimaleimide (1,3-PDM) and a range of linear alkyl dimaleimides…
Polyimides are commonly used as organic passivation layers for microelectronic devices due to their unique combination of properties such as low dielectric constant, high thermal stability, excellent mechanical properties and superior solvent resistance. Unfortunately, polyimides are well known to be difficult to bond…
This study focuses on the reaction characteristics of active hydrocarbon species mainly composed of methine radicals and active hydrogen species mainly composed of hydrogen radicals, to both of which methane as a raw material is converted by microwave irradiation to create plasma that comes into contact with the Pt/Al…
Electrochemical copolymerization of diphenylamine (DPA) with 2,5-dimethoxyaniline (DMA) was performed in 4 M H 2 S O 4 aqueous solution for different feed ratios of DPA using cyclic voltammetry. The deposition rate of DPA-DMA copolymer is higher than that of homopolymers (PDPA and PDMA). (DMA-co-DPA) film was deposite…
The aqueous, hexane, acetone, and methanol extracts of the stem bark of Anthocleista vogelii. Planch. (Loganiaceae) were screened for antiulcerogenic activity using HCl/ethanol gastric necrotizing solution. The methanol extract showed 100% inhibition at a dose of 500 mg/kg compared with the aqueous, hexane, and aceton…
Foram obtidas as propriedades mecânicas e viscoelásticas da poliuretana derivada do óleo de mamona após sua exposição ao intemperismo artificial, a fim de avaliar a aplicabilidade deste material como revestimento polimérico para substratos de concreto na Construção Civil. Os procedimentos experimentais foram realizado…
CaWO4 and Nd:CaWO4 (0.8 at. % Nd) single crystals were grown from the melt by the Czochralski technique in air. The crystal growth parameters dc and ?c were calculated by equations from the hydrodynamics of the melt, whereas the rate of crystal growth was experimentally obtained. The infrared reflectance spectra of Nd…
The effect of intermediate temperature oxidation on fatigue behavior of SiC/SiC is investigated to understand fatigue damage mechanisms. It has been found that fatigue life is decreased by 13% after oxidation at 600°C for 100 hours due to disappearance of carbon interphase by oxidation. The strong bonding between the…
Patterning and ashing are known to be critical steps to the integration of porous ultra low-k dielectrics in interconnects, mainly due to low-k damage during these processes. In this paper, we investigate the impact of a new methane based ash chemistry on the sidewall modification of the porous dielectric. Physical an…
Iron–chromium cyanide molecular magnet nanowire arrays have been fabricated on anodized aluminum oxide templates by electrochemical technology. The selectable lengths and diameters of the nanowires can be obtained by controlling the size of pores on the template. The result of transmission electron microscopy indicate…
Numerical simulations of the solid-liquid phase change of bismuth with a free surface are carried out under different gravity conditions. A multiphase approach using the Volume Of Fluid (VOF) method over a fixed grid is used to solve the thermocapillary induced flow of the melt and gas phases. The dynamics of the gas…
We demonstrate a method for enhancing the laser efficiency by stacking multiple dye-doped chiral polymer films. No laser emission was observed from a single 8 mum film. By stacking two films together, the laser efficiency is dramatically enhanced. Further increasing the number of stacked films, the output laser power…
Gas insulated transmission lines (GIL) are a means of bulk electric power transmission at extra high voltage. GIL consists of tubular aluminium conductors encased in a metallic tube that is filled with a mixture of sulphur hexafluoride and nitrogen gases for electrical insulation. Since the first installation of GIL i…
In order to develop a reaction rate equation for the high concentration CO2, the regeneration reaction of CaCO3 was examined for the corresponding pressure condition in the temperature range 1123–1193 K. It was observed that the reaction rate was controlled by CO2 diffusion during the initial period and thereafter by…
Spray forming is an advanced technology for the manufacture of homogeneous material from the melt. In this study, 20MnCr5 steel, a typical case hardening steel for gear and shaft production, has been spray formed and hot worked to semi-finished bars. Shaft-like specimens have been made from the spray-formed material f…
We have automatized the calculation of band structures. Using a rigid band approach and Boltzmann theory it is possible to calculate the Seebeck coefficient and effective mass of a given compound at varying carrier concentrations. One can therefore rapidly screen a material for potential thermoelectric applications. T…
The chemical strengthening of Li2O•2SiO2 transparent glass-ceramics was investigated. The fracture strength of glass and glass-ceramics increased first and then decreased, and the crack formation and peeling of ion exchanged layer were observed for both Li+↔Na+ and Li+↔K+ ion exchange. This suggests that the submicros…
With two hydrazide motifs installed at one edge, a novel supramolecular system self-assembled into a polymeric zipper-like structure via two hydrogen bonds at each knot, both in solution and in the solid state.