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Mathematical Programming - Given two matroids $$\mathcal {M}_{1} = (E, \mathcal {B}_{1})$$ and $$\mathcal {M}_{2} = (E, \mathcal {B}_{2})$$ on a common ground set E with base sets $$\mathcal... 相似文献
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Hoefman M Aphecetche L Bacelar JC Delagrange H Descouvemont P Diaz J d'Enterria D van Goethem M Holzmann R Huisman H Kalantar-Nayestanaki N Kugler A Lohner H Marques FM Martinez G Messchendorp JG Ostendorf RW Schadmand S Siemssen RH Simon RS Schutz Y Timmermans R Turrisi R Volkerts M Wagner V Weller H 《Physical review letters》2000,85(7):1404-1407
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J. Wt Timmermans D. de Wit H. Toumois B. R. Leeflang J. F. G. Vliegenthart 《Journal of carbohydrate chemistry》2013,32(7):969-979
Abstract Molecular Dynamics (MD) calculations have been performed on nystose in water. According to these calculations the glycosidic linkages of the molecule are flexible. Structures obtained with MD calculations are compared with NMR data of several inulin related oligosaccharides and inulin, resulting in a model for the conformation of their fructofuranosyl residues. To extend the set of available NMR data of inulin related oligosaccharides, the complete assignment of the 1H and 13C NMR signals of β-D-fructofuranosyl-(2->l)-ß-D-fructofuranosyl-(2->l)-ß-D-fructofuranosyl-(2->l)-ß-D-fructofuranosyl-(2->l)-α-D-glucopyranoside has been given here, using several 2D homo- and heteronuclear NMR experiments. Accurate coupling constants have been obtained by simulation of the 600 MHz 1D NMR spectra. 相似文献
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Sans résuméAvec 4 figures. 相似文献
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Simultaneous microdetermination of carbon, hdrogen and iodine in organic substances is practically possible on a five milligramme sample. The two first mentioned elements are gravimetrically deetermined, iodine being titrated. The available results are quite good.New calibration technique of capillary instruments enables precise titration of very small quantities of Iodine. It will help to improve precision of this determination. 相似文献
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J. W. Timmermans M. B. van Leeuwen H. Tournois D. de Wit J. F.G. Vliegenthart 《Journal of carbohydrate chemistry》2013,32(6):881-888
Abstract A method, using anion exchange chromatography and pulsed amperometric detection, is described for quantitative analysis of the oligosaccharides present in inulin. The analysis of a number averaged and molecular weight averaged degree of polymerisation and the dispersion of inulin and inulin fractions is given. 相似文献
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J. W. Timmermans P. M.P. Bogaert D. de Wit J. F.G. Vliegenthart 《Journal of carbohydrate chemistry》2013,32(7):1145-1158
Abstract The complete assignment of the 1H and 13C NMR spectra for permethylated sucrose, 1-kestose and nystose are given. Methylation of these inulin oligosaccharides did not change the conformation of the ring structures. A partially methylated derivative of nystose has been prepared using water as the solvent. The difference in reactivity of the various hydroxyl groups of nystose appeared to be very small. 相似文献
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Using the approach of Rulla (1996 SIAM J. Numer. Anal. 33, 68-87)for analysing the time discretization error and assuming moreregularity on the initial data, we improve on the error boundderived by Barrett and Blowey (1996 IMA J. Numer. Anal. 16,257-287) for a fully practical piecewise linear finite elementapproximation with a backward Euler time discretization of amodel for phase separation of a multi-component alloy. 相似文献