نتایج جستجو برای: pfeiffer
تعداد نتایج: 963 فیلتر نتایج به سال:
The Weyl groups are important for Lie algebras. Lie algebras arise in the study of Lie groups, coming from symmetries of differential equations, and of differentiable manifolds. The Weyl groups have been used to classify Lie algebras up to isomorphism. The Weyl group associated to a Lie algebra of type Bn and the group of graph automorphisms of the n-cube Aut(Qn) are known to be isomorphic to Z...
Rudolf Steiner’s Agriculture Course held at Koberwitz (now Kobierzyce, Poland) in 1924 was arguably the world’s first organic agriculture course although the terms ‘biodynamic agriculture’ and ‘organic farming’ appeared in the decades that followed. Ehrenfried Pfeiffer and others have stated that there were about 60 attendees at the course, while Rudolf Steiner and others have stated that there...
We study a generalization of 4-dimensional BF-theory in the context higher gauge theory. construct triangulation independent topological state sum Z, based on classical 3BF action for general 3-group and spacetime manifold. This coincides with Porter's TQFT d=4 n=3. In order to verify that constructed is invariant underlying manifold, its behavior under Pachner moves analyzed, it obtained Z rem...
Entre as viagens da escritora austríaca Ida Pfeiffer (1797–1858) esteve uma estadia de cerca dois meses ao Rio Janeiro, realizada em 1846. Seu relato dessa experiência no livro Eine Frau fährt um die Welt, assim como os outros livros do gênero, alimenta imaginário sobre o Brasil entre seus leitores europeus. Mas, além disso, apresenta vários dos imaginários autora e conterrâneos acerca que enco...
We show that the presently available data on the Gamow-Teller (GT) strength in mid-f p-shell nuclei are proportional to the product of the numbers of valence protons and neutron holes in the full f p-shell. This observation leads to important insights into the mechanism for GT quenching and to a simple parametrization of the Gamow-Teller strengths important for electron capture by f p-shell nuc...
The air-free reaction between FeCl(2) and H(4)dobdc (dobdc(4-) = 2,5-dioxido-1,4-benzenedicarboxylate) in a mixture of N,N-dimethylformamide (DMF) and methanol affords Fe(2)(dobdc)·4DMF, a metal-organic framework adopting the MOF-74 (or CPO-27) structure type. The desolvated form of this material displays a Brunauer-Emmett-Teller (BET) surface area of 1360 m(2)/g and features a hexagonal array ...
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