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991.
In this paper we deal with shape preserving interpolation of data sets given on rectangular grids. The aim is to show that there exist spline interpolants of the continuity classC
2 which areS-convex, monotone, or positive if the data sets have these properties. This is done by using particular rational bicubic splines defined on the grids introduced by the data. Interpolants of the desired type can be constructed by a simple search procedure. 相似文献
992.
993.
K.-H. Schmidt H.-G. Clerc H. Wohlfarth W. Lang W. Lehmann-Carpzov 《Physics letters. [Part B]》1975,56(3):250-252
Secondary electron yield measurements for 252Cf fission products in carbon foils reveal significant deviations for the electronic stopping cross section from semiempirical predictions. This effect may correspond to the Z1 oscillations observed previously at much lower ion velocities. 相似文献
994.
995.
Second-order rate constants for the Diels-Alder reaction of 90 aromatic hydrocarbons with maleic anhydride, measured spectrophotometrically at 91.5° in 1,2,4-trichlorobenzene, are correlated with various reactivity indices, namely Herndon's structure count ratios, second-order perturbation energies, Brown's paralocalization energies, Hess-Schaad resonance energy differences and Polansky indices. Apart from the latter theory, all methods yield satisfactory correlations, with the Hess-Schaad theory being marginally better. An explanation is given why the Hess-Schaad theory is superior to para-localization theory although both are based on Hückel π-electron energies. The observed regioselectivity is correctly accounted for by all except Polansky's theory which yields incorrect results for certain phenes and starphenes. 相似文献
996.
Several of the rare earth metals (Gd, Tb, Dy, Ho and Er) containing111Cd impurities have been studied by the method of time differential perturbed angular correlations (TDPAC) to study electric field gradients. Experiments have been made over a temperature range in which no magnetic interactions are expected. We have observed general correlation patterns whose shapes are temperature dependent. We suggest this provides evidence of a reversible temperature dependent strain or distortion near the impurity atom.Supported in part by the US Energy and Research Development Administration under grant #E(11-1)-2184. 相似文献
997.
P. Hungerford T. von Egidy H. H. Schmidt S. A. Kerr H. G. Börner E. Monnand 《Zeitschrift für Physik A Hadrons and Nuclei》1983,313(4):339-347
The gamma-ray spectrum emitted following thermal neutron capture in19F has been studied with curved crystal and Ge(Li) spectrometers. From the 109 transitions assigned to20F, 85 have been placed in a level scheme containing 26 levels. An average gammaray multiplicity of 2.8 gammas per neutron capture was observed. The neutron binding energy was found to be 6601.33(14) keV. The experimental level scheme is compared to rotational model predictions. In addition it is shown that the decay of the capture state is non-statistical and that there is a strong correlation between the strengths of excitation of levels by the (n, γ) and (d, p) reactions. Calculations of the partial cross-sections using the direct capture theory of Lane and Lynn give order of magnitude agreement with experiment. 相似文献
998.
Hans-Jürgen Schmidt 《Mathematische Nachrichten》1984,118(1):105-113
The hyperspace of all nonvoid closed subsets of a topological space will be topologized by means of different methods; each of them generalizes known definitions of special hyperspace topologies. One method uses the VIETORIS topology in the hyperspaces of certain extension spaces. Another one uses certain systems of closed subsets and leads to just the same class of hyperspace topologies. In natural order VIETORIS topology is the supremum of this class, and for locally compact spaces FLACHSMEYER topology is the infimum of this class. 相似文献
999.
Yves Bounameaux John W. Coffey Margaret O'Donnell Klaus Kling Ronald J. Quinn Peter Schnholzer Andr Szente Lawrence D. Tobias Thomas Tschopp Ann F. Welton Albert Fischli 《Helvetica chimica acta》1983,66(3):989-1008
Synthesis of Stereisomeric Pinanthromboxane Derivatives and Evaluation of the Compounds as Platelet Aggregation Inhibitors Starting from the two enantiomeric myrtenols ((?)- 1 and (+)- 1 ; cf. Scheme 1), the synthesis of twelve stereoisomeric pinanthromboxane derivatives ((+)- and (?)- 10, -11, -14, -15, -21 and -22 ) is described (cf. Schemes 1–4). Biological data from the evaluation as platelet aggregation inhibitors (cf. Table 6 and 7), thromboxane synthetase inhibitors (cf. Table 8) and from the assessment as antagonists of leukotriene E4 induced bronchoconstriction (cf. Table 9) are presented. 相似文献
1000.
The inverse electron demand hetero-Diels-Alder reaction of methoxymethylene substituted 1.3-dicarbonyl compounds with enol ethers and enediol ethers results in the selective formation of 3.4-dihydro-2H-pyrans. These adducts with a high density of functional groups are versatile intermediates for natural product syntheses. 相似文献