Materials Literature
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Thin films of SrAl 2 O 4 :Eu,Dy were successfully deposited on polyethylene substrates at room temperature by pulsed ion-beam evaporation. From X-ray diffraction analysis results, the thin films were found to consist of a crystallized SrAl 2 O 4 :Eu,Dy phase. In the measurements of the photoluminescence properties of…
Influence of Al content on corrosion resistance of Mg-Al-Zn alloys containing 1 to 9 mass%Al was investigated in chloride environments. The corrosion rate decreased with increasing the Al content in the alloys regardless of the testing methods such as salt immersion test (SIT) and salt spray test (SST). The immersion…
Different Eu 2 O 3 fine particle films were prepared by the laser ablation method. Under a continuous wave (CW) 325 nm laser light irradiation, their photoluminescence spectra are measured both in vacuum and in O 2 gas atmosphere. All the specimens display reversible spectral change and clear luminescence colour chang…
This article proposes a novel concept of hemostatic forceps for less invasive surgical operation. Hemostatic forceps has more than 400-year's history but remain an instrument with a potential of over-pressure induced lesion. The proposed hemostatic forceps allows a possibility to limit the clamping pressure within a s…
The oxidation rate of resin-bonded magnesia-carbon refractory, MgO–C, containing 5 mass % carbon, was measured continuously with a thermobalance in the temperature range from in and mixed gases with and of oxygen partial pressure, , respectively. The effect of the oxygen concentration in the atmospheric gas on the oxi…
This work contains a comparative study for the signal gain of thulium-doped fiber amplifier (TDFA) in the S-band. Different doping techniques are used to obtain different concentration profiles in silica fibers. The optimal one is found to be the step like profile. TDFA is investigated in new prepared glass hosts. The…
Environmental barrier coatings (EBCs) are being developed for silicon carbide fiber reinforced silicon carbide matrix (SiC/SiC) composites to protect against accelerated oxidation and subsequent silica volatilization in high temperature, high-pressure steam environments encountered in gas turbine engines. Engine testi…
Micro-probe Raman piezospectroscopy has been applied to analyse the behaviour of bulk samples of Lead Zirconate Titanate doped with Nb, Sr and Y (PZT-NSY) under mechanical load by performing 4-point bending experiments. The samples experienced different degree of silver migration from Ag electrodes. A residual stress…
The process of alkaline hydrolysis of polyester (PET) fabric under high-pressure conditions of over 100 MPa was examined. The decomposition of the PET fabric was accelerated with increased pressure. The addition of surfactant also enhanced the reaction rate when the concentration was more than 1.0 g/l. At high surfact…
Localized synthesis of Si nanocrystals (nc-Si) in plasma enhanced chemical vapor deposition-grown Si-rich (SRSO) layer is demonstrated using a laser annealing at intensity of . At an optimized surface temperature of , the precipitated nc-Si in annealed SRSO results in near-infrared photoluminescence at . The refractiv…
An accurate model description of the effects of stress on magnetic properties of materials has become increasingly important for quantitative analysis of magnetic NDE measurement results, and to the development of magnetostrictive sensors for NDE applications. The model of the magnetomechanical effect developed in the…
Model calculations have been carried out for a (5,5) single walled carbon nanotube (SWNT) C60H20 and cumulene C2nH4 or acetylene C2nH2 (n = 1–4) chains and for their complexes obtained by insertion of a respective chain into the nanotube to check whether the theoretical simulation can (a) reproduce the stabilization o…
65 nm and 45 nm silicon devices will utilize compositionally critical processes for gate dielectrics, capacitor dielectrics, gate and capacitor electrodes, and ultra shallow junction layers. For example, small changes in nitrogen composition have been correlated with unacceptable shifts in electrical properties of dev…
The joining of graphite, ceramic SiC and Cf/SiC composites via preceramic silicone resin(SR) at high temperature (800-1400℃) was studied. The curing and pyrolysis process of SR, pyrolysis temperature, inert and active fillers were especially discussed. The results show that the curing process of SR was accomplished by…
The disadvantageous effects of colloidal SiO2 layer and micro-content of metal oxide adsorbed on SiC powder surface on SiC slurry stable dispersion were studied, and the novel method to avoid this disadvantage was proposed. By acidwashing, on the one hand, because the maximum Zeta potential of SiC powder increases to…
A mechanochemical reconditioner package has been investigated in our laboratory which could be used to generate an in situ protective layer on worn metal surfaces as a result of mechanochemical reactions between worn tribosurfaces, wear debris and a special reconditioner formulation. The main constituent in the recond…
On p-doped GaAs(100) surface, the band bending arising from Fermi-level pinning significantly affects the carrier and spin dynamics. In this paper, we report th e dynamics of spin polarization of p-doped GaAs(100) by using the time-resolve d and the energy-resolved two-photon photoemission techniques. By measuring the…
olyaniline and polypyrrole are two conducting polymers that show ion-exchange properties. Due to their easy processibility, they can be used for surface modification of different substances. For instance they can be coated on silica particles. In this work anion-exchange properties of polyaniline-coated silica gel for…
The aim of this paper is to understand the statistical inception mechanism of the first corona in positive non-uniform air gaps ranging 0.3˜1.0 cm. We calculated first how the spatial distributions of negative ion density depend on the gap length, UV irradiation and the concentration of water vapor using the steady st…
We consider anisotropic colloidal particles immersed in a solution of long, flexible, and non-adsorbing polymers: For the dumbbell shapes of recently synthesized particles consisting of two intersecting spheres, and for lens-shaped particles with spherical surfaces; we calculate the isotropic and anisotropic interacti…