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51.
Codée JD Litjens RE van den Bos LJ Overkleeft HS van der Marel GA 《Chemical Society reviews》2005,34(9):769-782
This tutorial review surveys the use of thioglycosides in the development of sequential glycosylation methodologies, with a focus on chemoselective, orthogonal and iterative glycosylation strategies reported since the beginning of this century. Both fundamental aspects of glycosidic bond formation and ingenious state-of-the-art methodologies are presented. 相似文献
52.
Werner Bos 《Mathematische Annalen》1964,157(4):276-277
Ohne Zusammenfassung 相似文献
53.
Klaas D. Bos Eric J. Bulten Harry A. Meinema Jan G. Noltes 《Journal of organometallic chemistry》1979,168(2):159-162
Reaction of dicyclopentadienyltin(II) with pentamethylantimony gives [Me4Sb]2+[(C5H5)4Sn]2?, the first example of an anionic organotin(II) species. 相似文献
54.
On the Lebesgue constant for the Xu interpolation formula 总被引:3,自引:0,他引:3
In the paper [Y. Xu, Lagrange interpolation on Chebyshev points of two variables, J. Approx. Theory 87 (1996) 220–238], the author introduced a set of Chebyshev-like points for polynomial interpolation (by a certain subspace of polynomials) in the square [-1,1]2, and derived a compact form of the corresponding Lagrange interpolation formula. In [L. Bos, M. Caliari, S. De Marchi, M. Vianello, A numerical study of the Xu polynomial interpolation formula in two variables, Computing 76(3–4) (2005) 311–324], we gave an efficient implementation of the Xu interpolation formula and we studied numerically its Lebesgue constant, giving evidence that it grows like , n being the degree. The aim of the present paper is to provide an analytic proof to show that the Lebesgue constant does have this order of growth. 相似文献
55.
A Lagrangian study of two-dimensional turbulence for two different geometries, a periodic and a confined circular geometry, is presented to investigate the influence of solid boundaries on the Lagrangian dynamics. It is found that the Lagrangian acceleration is even more intermittent in the confined domain than in the periodic domain. The flatness of the Lagrangian acceleration as a function of the radius shows that the influence of the wall on the Lagrangian dynamics becomes negligible in the center of the domain, and it also reveals that the wall is responsible for the increased intermittency. The transition in the Lagrangian statistics between this region, not directly influenced by the walls, and a critical radius which defines a Lagrangian boundary layer is shown to be very sharp with a sudden increase of the acceleration flatness from about 5 to about 20. 相似文献
56.
57.
A small number of bifunctional monomers are mixed with a nematic liquid crystal (LC) and cured with a distributed electric field, which is produced by a circular-hole-patterned electrode structure. A gradient type of lens, that is, a LC microlens, is investigated for various polymer concentrations. Addition of 3% polymer is enough to freeze the gradient-index properties of the structure in the form of a convex lens, and a polymer-stabilized LC microlens is demonstrated. Although a lower concentration of polymer cannot hold the distribution properties in a curing process, it can maintain the variable focus as a nematic material can. The polymer networks can also eliminate the disclination line that usually appears and causes the lens in this type of LC device to deteriorate. 相似文献
58.
59.
We discuss three natural pseudodistances and pseudometrics on a bounded domain in based on polynomial inequalities. 相似文献
60.
High pressure synthesis of late rare earth RFeAs(O,F) superconductors; R = Tb and Dy 总被引:1,自引:0,他引:1
Bos JW Penny GB Rodgers JA Sokolov DA Huxley AD Attfield JP 《Chemical communications (Cambridge, England)》2008,(31):3634-3635
New TbFeAs(O,F) and DyFeAs(O,F) superconductors with critical temperatures T(c) = 46 and 45 K and very high critical fields, >/=100 T, have been prepared at 1100-1150 degrees C and 10-12 GPa, demonstrating that high pressure may be used to synthesise late rare earth derivatives of the recently reported RFeAs(O,F) (R = La-Nd, Sm, Gd) high temperature superconductors. 相似文献