نتایج جستجو برای: 083 cl
تعداد نتایج: 40329 فیلتر نتایج به سال:
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We investigate the chemical and morphological structure of the Au nanodots on Ge(111) which serve as catalysts for the formation of epitaxial Ge nanowires. The spatial localization of Au is investigated by X-ray spectromicroscopy and transmission electron microscopy. We show that dewetting of an Au film on Ge(111) gives rise to a thin Au-Ge wetting layer and Au-Ge dots. These dots are crystalli...
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Maxwell is credited as the first to invoke the assumption that an impinging gas beam scatters from a surface with a direct contribution exhibiting little change in state and a trapping-desorption fraction that desorbs in equilibrium [J. C. Maxwell, Phil. Trans. R. Soc. London 170, 231 (1879)]. Here a classical mechanical scattering theory is developed to describe direct scattering, trapping, an...
I . The specificity of a number of samples of methyl green for egg-shell material in Fasciola hepatica was investigated. 2. A method for distinguishing between specific and non-specific stains by paper chromatography is described. 3. Specific stains gave almost identical chromatograms with an Rf value of 083 for both green and violet constituents. Non-specific samples gave chromatograms with an...
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With a phase-modulated extreme ultraviolet pulsed laser source the frequency of the 1 S-2 P transition of helium at 58 nm has been measured. The phase modulation scheme enabled measurement and reduction of frequency chirp, usually limiting pulsed precision spectroscopy. From the measured transition frequency of 5 130 495 083~45! MHz, a fourfold improved value of the ground state Lamb shift of 4...
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We present a direct measurement of the parity-violating parameter A b by analyzing the left-right forward-backward asymmetry of b quarks in polarized Z 0 decays with a nal state kaon charge tag. The 1994-1995 SLD data sample of 100,000 hadronic Z 0 decays produced with a highly polarized electron beam is used for this analysis. A b-enriched sample is obtained from a vertex-mass tag using a CCD-...
Photoproduction at HERA is studied in ep collisions, with the ZEUS detector, for γp centre-of-mass energies ranging from 130-270 GeV. A sample of events with two high-pT jets (pT > 6 GeV, η < 1.6) and a third cluster in the approximate direction of the electron beam is isolated using a clustering algorithm. These events are mostly due to resolved photoproduction. The third cluster is identified...
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