207,130 research outputs found
Evolutionary computation in dynamic and uncertain environments
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Editorial to special issue on evolutionary computation in dynamic and uncertain environments
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Light-Driven Hydrogen Production from Aqueous Solutions Based on a New Dubois-Type Nickel Catalyst
In this work, we report a new photocatalytic system that links multifunctional semiconductor nanocrystals with emerging water-soluble molecular catalysts made of earth-abundant elements for H2 generation [Ni(P2RN2R′)2(BF4)2]4−, R = Ph, R′ = [PhSO3]− (NiS). This noble metal free hybrid exhibits remarkable catalytic activity with a turnover number of 511 for H2 production and a photon-to-H2 conversion efficiency of 12.5%. The mechanistic insight into such high efficiency in this photocatalytic system was examined using a combination of steady-state emission and time-resolved absorption spectroscopy
On the Genus Expansion in the Topological String Theory
A systematic formulation of the higher genus expansion in topological string
theory is considered. We also develop a simple way of evaluating genus zero
correlation functions. At higher genera we derive some interesting formulas for
the free energy in the and models. We present some evidence that
topological minimal models associated with Lie algebras other than the A-D-E
type do not have a consistent higher genus expansion beyond genus one. We also
present some new results on the model at higher genera.Comment: 36 pages, phyzzx, UTHEP-27
Topological Field Theories and the Period Integrals
We discuss topological Landau-Ginzburg theories coupled to the 2-dimensional
topological gravity. We point out that the basic recursion relations for
correlation functions of the 2-dimesional gravity have exactly the same form as
the Gauss-Manin differential equations for the period integrals of
superpotentials. Thus the one-point functions on the sphere of the
Landau-Ginzburg theories are given exactly by the period integrals. We discuss
various examples, A-D-E minimal models and the topological theories.Comment: 12 pages, phyzzx, UT 64
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