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A discussion is given of the relation between the maximum functionaltheorem and Schwinger's variational principle, and it is shownthat the bound given by Schwinger's principle is better thanor the same as that given by the maximum functional theorem. 相似文献
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Van Zandt LL 《Physical review letters》1986,57(16):2085-2087
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Following the variational principles for linear initial valueproblems associated with the wave and heat conduction equationsdiscussed by Gurtin and Leitmann and using time convolutionsit is shown that general variational principles exist for theseproblems with sources on the boundaries and within the regionunder consideration. 相似文献
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Modified Locally One Dimensional Methods for Parabolic Partial Differential Equations in Two Space Variables 总被引:1,自引:0,他引:1
In this note we consider the locally one dimensional methodas discussed in Gourlay & Mitchell (1969, 1972) and indicatehow this scheme can be used to solve accurately a parabolicpartial differential equation in two space variables. 相似文献
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Mansell D Rattray N Etchells LL Schwalbe CH Blake AJ Bichenkova EV Bryce RA Barker CJ Díaz A Kremer C Freeman S 《Chemical communications (Cambridge, England)》2008,(41):5161-5163
Natural myo-inositol phosphate antioxidants containing the 1,2,3-trisphosphate motif bind Fe(3+) in the unstable penta-axial conformation. 相似文献
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Davide Bacciu Terence A. Etchells Paulo J. G. Lisboa Joe Whittaker 《Computational Statistics》2013,28(2):621-646
Conditional independence graphs are now widely applied in science and industry to display interactions between large numbers of variables. However, the computational load of structure identification grows with the number of nodes in the network and the sample size. A tailored version of the PC algorithm is proposed which is based on mutual information tests with a specified testing order, combined with false negative reduction and false positive control. It is found to be competitive with current structure identification methodologies for both estimation accuracy and computational speed and outperforms these in large scale scenarios. The methodology is also shown to approximate dense networks. The comparisons are made on standard benchmarking data sets and an anonymized large scale real life example. 相似文献