排序方式: 共有39条查询结果,搜索用时 46 毫秒
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The energies of single-particle states in nuclei with A < 35 are obtained as eigenvalues of a local Saxon-Woods potential with depth depending linearly on A and on the nuclear symmetry parameter. 相似文献
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J. A. Muller C. Reinhardt C. Fischbach A. Siebenschub V. Stanek N. M. Randall K. Bogoluboff H. Wdowiszewski F. Garrat D. J. Demorest J. R. Cain H. E. Walters F. C. T. Daniels A. J. Field A. Terni P. Malaguti B. S. Evans L. W. Winkler O. L. Barnebey G. L. Kelley J. A. Wiley E. Little J. Costa M. Gröger H. O. Ward P. Slawik W. Hild und F. Simion 《Fresenius' Journal of Analytical Chemistry》1923,63(9):348-359
Ohne Zusammenfassung 相似文献
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Bergner Martin Caprara Alberto Ceselli Alberto Furini Fabio Lübbecke Marco E. Malaguti Enrico Traversi Emiliano 《Mathematical Programming》2015,149(1-2):391-424
Mathematical Programming - Dantzig–Wolfe decomposition (or reformulation) is well-known to provide strong dual bounds for specially structured mixed integer programs (MIPs). However, the... 相似文献
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Mercolini L Addolorata Saracino M Bugamelli F Ferranti A Malaguti M Hrelia S Raggi MA 《Journal of separation science》2008,31(6-7):1007-1014
An original analytical method has been developed for the determination of the antioxidants trans-resveratrol (t-RSV) and cis-resveratrol (c-RSV) and of melatonin (MLT) in red and white wine. The method is based on HPLC coupled to fluorescence detection. Separation was obtained by using a RP column (C8, 150 mm x 4.6 mm id, 5 mum) and a mobile phase composed of 79% aqueous phosphate buffer at pH 3.0 and 21% ACN. Fluorescence intensity was monitored at lambda = 386 nm while exciting at lambda = 298 nm, mirtazapine was used as the internal standard. A careful pretreatment of wine samples was developed, using SPE with C18 cartridges (100 mg, 1 mL). The calibration curves were linear over the following concentration ranges: 0.03-5.00 ng/mL for MLT, 3-500 ng/mL for t-RSV and 1-150 ng/mL for c-RSV. The LOD values were 0.01 ng/mL for MLT, 1 ng/mL for t-RSV and 0.3 ng/mL for c-RSV. Precision data, as well as extraction yield and sample purification results, were satisfactory. Thus, the method seems to be suitable for the analysis of MLT and resveratrol isomers in wine samples. Moreover, wine total polyphenol content and antioxidant activity were evaluated. 相似文献
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Fabio Furini Enrico Malaguti Rosa Medina Durán Alfredo Persiani Paolo Toth 《European Journal of Operational Research》2012,218(1):251-260
We consider a two-dimensional cutting stock problem where stock of different sizes is available, and a set of rectangular items has to be obtained through two-staged guillotine cuts. We propose a heuristic algorithm, based on column generation, which requires as its subproblem the solution of a two-dimensional knapsack problem with two-staged guillotines cuts. A further contribution of the paper consists in the definition of a mixed integer linear programming model for the solution of this knapsack problem, as well as a heuristic procedure based on dynamic programming. Computational experiments show the effectiveness of the proposed approach, which obtains very small optimality gaps and outperforms the heuristic algorithm proposed by Cintra et al. [3]. 相似文献
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E. Caroli G. Baldazzi G. Di Cocco A. Donati W. Dusi G. Malaguti J. B. Stephen M. Trifoglio 《Il Nuovo Cimento C》1993,16(6):727-733
Summary Our knowledge of the hard-X- and soft-γ-ray sky obtained in the last few years by satellite missions and in particular by
SIGMA has demonstrated that in this energy range the next generation of instruments must provide both good imaging over a
large field of view and fine spectroscopy over a large energy band. Currently, a possible answer to these requirements may
be offered by instruments based on position-sensitive detectors (PSD) constructed of modular arrays of CdTe microspectrometers.
CdTe is a room temperature compound semiconductor with highZ that can be grown in large pure crystals and then cut so as produce small spectroscopic devices. By packing these elements
into arrays, it is possible to construct highly segmented detectors sensitive from ∼ 10 keV to a few MeV. Due to the intrinsic
characteristics of these CdTe microspectrometers, such a PSD would offer fine spatial resolution (down to a few millimetres)
and good spectroscopic performance (E/ΔE>50 forE=500 keV). We present experimental results obtained from CdTe microdetectors with various geometrical shapes and sizes. Furthermore,
we outline a possible coded-mask telescope design based on a CdTe PDS together with an evaluation of the achievable sensitivity.
Paper presented at the 6th Cosmic Physics National Conference, Palermo, 3–7 November 1992. 相似文献
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We investigate dispersive shock waves developing via a gradient catastrophe during propagation of a dark beam in Kerr defocusing media, showing that a good degree of control, and even shock suppression, is possible by introducing a suitable phase chirp. Insight into the process is obtained by means of a suitable reduction of the hydrodynamic limit of the governing nonlinear Schr?dinger equation. 相似文献
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We consider a weighted version of the well-known Vertex Coloring Problem (VCP) in which each vertex i of a graph G has associated a positive weight w
i
. Like in VCP, one is required to assign a color to each vertex in such a way that colors on adjacent vertices are different,
and the objective is to minimize the sum of the costs of the colors used. While in VCP the cost of each color is equal to
one, in the Weighted Vertex Coloring Problem (WVCP) the cost of each color depends on the weights of the vertices assigned to that color, and it equals the maximum of
these weights. WVCP is known to be NP-hard and arises in practical scheduling applications, where it is also known as Scheduling
on a Batch Machine with Job Compatibilities. We propose three alternative Integer Linear Programming (ILP) formulations for
WVCP: one is used to derive, dropping integrality requirement for the variables, a tight lower bound on the solution value,
while a second one is used to derive a 2-phase heuristic algorithm, also embedding fast refinement procedures aimed at improving
the quality of the solutions found. Computational results on a large set of instances from the literature are reported. 相似文献
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In this paper we consider some generalizations of the vertex coloring problem, where distance constraints are imposed between adjacent vertices (bandwidth coloring problem) and each vertex has to be colored with more than one color (bandwidth multicoloring problem). We propose an evolutionary metaheuristic approach for the first problem, combining an effective tabu search algorithm with population management procedures. The approach can be applied to the second problem as well, after a simple transformation. Computational results on instances from the literature show that the overall algorithm is able to produce high quality solutions in a reasonable amount of time, outperforming the most effective algorithms proposed for the bandwidth coloring problem, and improving the best known solution of many instances of the bandwidth multicoloring problem. 相似文献