Oxidized Forms of Antiaromatic Oligomers of Biphenylene

Rsumen de la comunicaciónThe importance of antiaromatic molecules in Chemistry and more recently in material science is rising. In the particular case of applications in electronics, the antiaromatic skeleton offers the favorable situation of high energy (i.e., destabilized) occupied molecular orbitals allowing to ease oxidation, doping or electron transfer to form conductive and photo-active substrates.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec

Is the Precession of Mercury\u27s Perihelion a Natural (Non-Relativistic) Phenomenon?

The general theory of relativity claims that the excess of precession of the planetary orbits has its origin in the curvature of space-time produced by the Sun in its near vicinity. In general relativity, gravity is thought to be a measure of the curvature of spacetime when matter is present. By arguing that free falling particles follow geodesies inside gravitational fields, Schwarzschild\u27s solution to Einstein\u27s field equations explains that when space-time is approximately flat (weak aravitational pull of the Sun), the planetary orbits describe minute precessions which, for Mercury, agrees well with observation. This brief paper explains, first by elaborating on pure special relativity arguments, and second, by considering another solution to Newton\u27s gravitational law, that Mercury\u27s orbital precession does not necessarily demonstrate the unique validity of general relativity

Comparing solution methods for dynamic equilibrium economies

This paper compares solution methods for dynamic equilibrium economies. The authors compute and simulate the stochastic neoclassical growth model with leisure choice using Undetermined Coefficients in levels and in logs, Finite Elements, Chebyshev Polynomials, Second and Fifth Order Perturbations and Value Function Iteration for several calibrations. The authors document the performance of the methods in terms of computing time, implementation complexity and accuracy and they present some conclusions about their preferred approaches based on the reported evidence.