3/15/08 " Who do we ask for help when we don't know which way to go? The map! "-Dora the Explorer
Quantum chemical calculations are used to explore the origins of regioselectivity for proton-, Pt(II)- and Pd(II)-promoted cyclizations of 1,5-hexadienes, 5-aminoalkenes, and allylic acetimidates. The strain associated with achieving carbonium ion-like transition state geometries is shown to be a key factor in controlling 5-exo vs. 6-endo selectivity.
In the present work is presented some considerations for a possible generalization of the Microcanonical Thermoestatics (M.T h) of D.H.E. Gross. The same reveals a geometric aspect that commonly it has been disregarded so far: the local reparametrization invariance. This new characteristic leads to the needing of generalizing the methods of M.T h to be… (More)
In the present paper are analyzed the conditions for the validity of the Tsallis Statistics. The same have been done following the analogy with the traditional case: starting from the microcanonical description of the systems and analysing the scaling properties of the fundamental macroscopic observables in the Thermodynamic Limit. It is shown that the… (More)
The study of associativity of the commutator operation in groups goes back to some work of Levi in 1942. In the 1960's Richard J. Thompson created a group F whose elements are representatives of the generalized associative law for an arbitrary binary operation. In 2006, Geoghegan and Guzmán proved that a group G is solvable if and only if the commutator… (More)
We discuss different aspects of the present status of the Statistical Physics focusing the attention on the non-extensive systems, and in particular, on the so called small systems. Multimicrocanon-ical Distribution and some of its geometric aspects are presented. The same could be a very atractive way to generalize the Thermodynamics. It is suggested that… (More)
Web services provide a standard means to achieve interoperability between different software applications in a heterogeneous distributed environment. The Web Services Resource Framework (WSRF) has redefined Grid computing standards, making Web services more suitable for Grid applications by adding persistent state management. A primary benefit of Web and… (More)