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Metal/superconductor/semiconductor (Ag/Hg-1212/CdSe) hetero-nanostructures have been fabricated using pulse-electrodeposition
technique and are characterized by X-ray diffraction (XRD), full-width at half-maximum (FWHM) and scanning electron microscopy
(SEM) studies. The junction capacitance of Ag/Hg-1212, Hg-1212/CdSe and Ag/Hg-1212/CdSe heterojunctions is measured in dark
and under laser irradiation at room temperature. The nature of the junction formed and built-in-junction potentials were determined.
The increase in carrier concentration across the junction due to photo-irradiation has been observed. 相似文献
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One of the innovative technological directions for the high-temperature superconductors has been persued by fabricating the
heteroepitaxial multilayer structures such as superconductor-semiconductor heterostructures. In the present investigation,
metal/superconductor/semiconductor (Ag/Tl-2223/CdSe) hetero-nanostructures have successfully been fabricated using dc electrodeposition
technique and were characterized by X-ray diffraction (XRD), full-width at half-maximum (FWHM) and scanning electron microscopy
(SEM) studies. The measurement of junction capacitance as a function of biasing voltage was used for the estimation of junction
built-in-potential (V
D) and to study the charge distribution in a heterojunction. The Mott-Schottky plots were measured for each junction in dark
and under the photo-irradiation. The effect of laser irradiation on C-V characteristics of hetero-nanostructure has been studied. 相似文献
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Ramesh-Babu Adusumalli Rejin Raghavan Rudy Ghisleni Tanja Zimmermann Johann Michler 《Applied Physics A: Materials Science & Processing》2010,100(2):447-452
The deformation and failure of the secondary cell wall of Spruce wood was studied by in-situ SEM compression of micropillars
machined by the focused ion beam technique. The cell wall exhibited yield strength values of approximately 160 MPa and large
scale plasticity. High resolution SEM imaging post compression revealed bulging of the pillars followed by shear failure.
With additional aid of cross-sectional analysis of the micropillars post compression, a model for deformation and failure
mechanism of the cell wall has been proposed. The cell wall consists of oriented cellulose microfibrils with high aspect ratio
embedded in a hemicellulose-lignin matrix. The deformation of the secondary wall occurs by asymmetric out of plane bulging
because of buckling of the microfibrils. Failure of the cell wall following the deformation occurs by the formation of a shear
or kink band. 相似文献
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Oxide dispersion strengthened (ODS) steels are candidate materials for advanced electric energy and heat generation plants
(nuclear, fossil). Understanding the degradation of mechanical properties of these alloys as a result of service exposure
is necessary for safe design. For advanced nuclear applications combinations of temperature, irradiation and stress are important
damage conditions. They are studied either with neutron irradiated samples (often highly active) or with ion-irradiated samples
(irradiation damage often limited to only a few micrometer deep areas). High activity of samples and limited sample volume
claim to subsized samples like nano-indentation, micro-pillar compression or thin strip creep testing. Irradiation hardening
and irradiation creep were studied with these methods. Ferritic ODS steels with 19% chromium were investigated. The materials
were studied in qualities differing in grain sizes and in sizes of the dispersoids. Irradiation was performed in an accelerator
using He-ions. Irradiation damage profiles could be well analyzed with indentation. Yield stress determined with compression
tests of single-crystal micropillars was well comparable with tension tests performed along the same crystallographic orientation.
Irradiation creep of samples with different sizes of dispersoids revealed only a small influence of particle size being is
in contrast with thermal creep but consistent with expectations from other investigations. 相似文献
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High-performance liquid chromatographic (LC) and ultraviolet derivative spectrophotometric (UVD) methods were developed and validated for the quantitative determination of epinastine hydrochloride in coated tablets. LC was performed on a reversed-phase RP-18 column with a mobile phase composed of 0.3% triethylamine (pH adjusted to 4.0 with 10% orthophosphoric acid)-methanol (60 + 40, v/v). The first-order derivative method was performed at 243.8 nm using HCI and methanol as the solvent. The methods were validated according to U.S. Pharmacopoeia and International Conference on Harmonization guidelines. The statistical analysis by Student's t-test showed no significant difference between the results obtained by the 2 methods. The proposed methods were found to be simple, rapid, precise, accurate, robust, and sensitive, allowing perfect interchange. The LC and UVD methods can be used in the routine quantitative determination of the epinastine hydrochloride in coated tablets. 相似文献
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W.?DatcharyEmail author A.?Mehner H.?W.?Zoch D.?A.?Lucca M.?J.?Klopfstein R.?Ghisleni D.?Grimme E.?Brinksmeier 《Journal of Sol-Gel Science and Technology》2005,35(3):245-251
Flexible and economic production of complex reflective optical elements is achieved by high-precision machining of aluminum and copper with diamond tools. There is also an increasing demand for complex refractive optical elements like micro lens arrays, Fresnel lenses or prismatic surfaces on silicon wafers or metallic surfaces. For the production of these optical elements, hybrid sol-gel coatings based on methacryloxypropyltrimethoxysilane (MATMS) and zirconium (IV) tetra n-propoxide (ZTP) were deposited on aluminum substrates by spin-coating. The influence of the rotational velocity and the chemical sol composition on the coating thickness was determined. The hardness and elastic modulus of these coatings was measured as a function of the chemical composition. The machining characteristics of these coatings were investigated by high precision turning and fly cutting with diamond tools of different geometry. The resulting surface finish obtained was determined as a function of the machining parameters. 相似文献
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