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71.
Wilczek F 《Physical review letters》1987,58(18):1799-1802
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We demonstrate, by construction, that simple renormalizable matrix potentials with S(N), as opposed to O(N), symmetry can exhibit an exponentially large number of inequivalent deep local minima. 相似文献
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Elizabeth F. Mccord Waifong L. Anton Lech Wilczek Steven D. Ittel Lissa T. J. Nelson Keith D. Raffell Joan E. Hansen Charles Berge 《Macromolecular Symposia》1994,86(1):47-64
1H NMR and 13C NMR have been used to study the end groups and tacticity in PMMA macromonomers and oligomers. These macromonomers are terminated almost exclusively in one vinylidene group per chain. The end group signals from the macromonomers are identified in both the 13C and 1H NMR spectra. The spectra of the purified oligomers (n = 1-4) were used to aid in assignment. The macromonomers are predominantly syndiotactic, and the tacticity measured is consistent with Bernoullian statistics. The tetramer is a mixture of r and m isomers in a 4:1 ratio. It is shown that T1 experiments can provide a useful method of distinguishing resonances due to low molecular weight impurities from those due to stereochemical or isomeric effects in macromonomers. The absence of internal double bonds was confirmed by isomerizing the vinylidene group of several oligomers and of the macromonomer, and verifying the absence of the isomerized signals in the NMR spectra of the original materials. 相似文献
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Frank Wilczek 《The European Physical Journal C - Particles and Fields》2009,59(2):185-196
The standard model of fundamental interactions is remarkably successful, but it leaves an unfinished agenda. Several major
questions seem ripe for exploration in the near future. I anticipate that the coming decade will be a Golden Age of discovery
in fundamental physics. 相似文献
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