排序方式: 共有27条查询结果,搜索用时 15 毫秒
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V. P. Kolotov A. Yu. Andriyanov S. N. Shilobreeva V. I. Korobkov N. N. Dogadkin B. A. Chapyzhnikov Yu. M. Tsipenyuk 《Journal of Radioanalytical and Nuclear Chemistry》2007,271(3):671-678
It has been shown that gamma-activation significantly extends possibilities of activation autoradiography with respect to
determination of platinum group elements (PGE) in silicate samples. All PGE may be activated by bremsstrahlung with forming
radionuclides having convenient half-lives for autoradiography (hours-days). Digital methods for quantitative 2D-densitometry
of autoradiograph images by means of documents scanners have been developed and discussed. Approaches for increasing selectivity
of analysis by means of autoradiography have been proposed and tested on the real sample containing PGE inclusions (analysis
of decay kinetics while cooling, combination with gamma-ray spectrometry). 相似文献
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We study the moment problem in a complex domain. The results obtained generalize and sharpen the well-known Kaz'min result. We also consider applications of these results to the Abel--Goncharov problem (the uniqueness and construction problem) and to the completeness problem for systems of analytic functions. 相似文献
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M. M. Mikhailov T. A. Burtseva A. N. Lapin D. I. Andriyanov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2010,4(6):1002-1007
The influence of synthesis temperature on the granulometric composition of a Ba0.65Sr0.35Ti O3 pigment and the optical properties and radiation resistance of pigment-based coatings has been analyzed. It has been found
that a rise in synthesis temperature decreases the sizes of pigment particles, deteriorates the reflectance of the coatings,
and enhances their radiation resistance. 相似文献
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Márcio AF Belo-Filho Franklina MB Toledo Bernardo Almada-Lobo 《The Journal of the Operational Research Society》2014,65(11):1735-1747
Setup operations are significant in some production environments. It is mandatory that their production plans consider some features, as setup state conservation across periods through setup carryover and crossover. The modelling of setup crossover allows more flexible decisions and is essential for problems with long setup times. This paper proposes two models for the capacitated lot-sizing problem with backlogging and setup carryover and crossover. The first is in line with other models from the literature, whereas the second considers a disaggregated setup variable, which tracks the starting and completion times of the setup operation. This innovative approach permits a more compact formulation. Computational results show that the proposed models have outperformed other state-of-the-art formulation. 相似文献
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Stability and convergence of the spectral Lagrange-Galerkin method for mixed periodic/non-periodic convection-dominated diffusion problems 总被引:1,自引:0,他引:1
We present a convergence analysis of the spectral Lagrange-Galerkinmethod for mixed periodic/non-periodic convection-diffusionproblems. The scheme is unconditionally stable, independentof the diffusion coefficient, even in the case when numericalquadrature is used. The theoretical predictions are illustratedby a series of numerical experiments. For the periodic case,our results present a significant improvement on those givenby Süli & Ware (1991) SIAM J. Numer.Anal.28, 423-445). 相似文献
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V. P. Kolotov A. Yu. Andriyanov N. N. Dogadkin S. N. Shilobreeva B. A. Chapyzhnikov Yu. M. Tsipenyuk V. I. Korobkov 《Journal of Analytical Chemistry》2003,58(9):882-886
The potential of the gamma activation determination of platinum-group elements and gold both by instrumental gamma activation analysis (bulk analysis) and by monitoring their distribution using autoradiography (local analysis) is studied. It is shown that platinum-group elements and gold can be determined by direct gamma-ray spectrometry in silicate samples with a detection limit of 10–3–10–5%. In contact gamma activation autoradiography, the detection limit for these elements is about 10 ng with a spatial resolution of 10–20 m. 相似文献
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Temperature dependence of pressure broadening of the N = 1− fine structure oxygen line at 118.75 GHz
M.Yu. Tretyakov M.A. Koshelev I.A. Koval V.V. Parshin L.M. Kukin L.I. Fedoseev Yu.A. Dryagin A.F. Andriyanov 《Journal of Molecular Spectroscopy》2007,241(1):109-111
The absorption profile of the N = 1− fine structure line of oxygen was recorded by a resonator spectrometer at a frequency range of 110-130 GHz at atmospheric pressure and different temperatures ranging from −21 °C up to +22 °C. Analysis of the observed line shape allowed determination of the temperature dependence of the line pressure broadening. The measured value of the temperature exponent is n = 0.74(5) for self-broadening. Consistency of the measurements is supported by simultaneous measurements of the line intensity, the line mixing parameter and the line center frequency, and by comparison of obtained values with previously known data. 相似文献