Wirtschaftliche Entwicklung und Demokratie: ist Demokratie ein Wohlstandsmotor oder ein Wohlstandsprodukt?

Economically highly developed countries are mostly democratic. But does this association constitute a causal relationship according to which democracy is a determinant of economic development? Or is it, conversely, economic development that paves the way for democratization? This paper gives an overview of the recent empirical literature that has dealt with this question. The empirical evidence raises doubts about the existence of any direct causation. However, there seem to be indirect causal mechanisms. Democracies seem to implement better conditions for the accumulation of human capital, in particular in terms of a rule of law. On the other hand do democracies not simply arise as consequence of economic development, but because of an adequate social environment with little inequality, that may be associated with economic well-being

On the mechanisms governing gas penetration into a tokamak plasma during a massive gas injection

A new 1D radial fluid code, IMAGINE, is used to simulate the penetration of gas into a tokamak plasma during a massive gas injection (MGI). The main result is that the gas is in general strongly braked as it reaches the plasma, due to mechanisms related to charge exchange and (to a smaller extent) recombination. As a result, only a fraction of the gas penetrates into the plasma. Also, a shock wave is created in the gas which propagates away from the plasma, braking and compressing the incoming gas. Simulation results are quantitatively consistent, at least in terms of orders of magnitude, with experimental data for a D 2 MGI into a JET Ohmic plasma. Simulations of MGI into the background plasma surrounding a runaway electron beam show that if the background electron density is too high, the gas may not penetrate, suggesting a possible explanation for the recent results of Reux et al in JET (2015 Nucl. Fusion 55 093013)