R-matrix and K-matrix analysis of elastic alpha-alpha scattering

The R- and K-matrix parametrizations are analyzed and compared for the elastic alpha-alpha scattering at center-of-mass energies below 40 MeV. The two parametrizations differ in their definitions of the resonance energy which can lead to quite different results. The physical values of the best-fit parameters are compared with those computed for a potential model. The existence of a broad resonance near 9 MeV is not supported by the data or by the potential model. We discuss the positive and negative aspects for both parametrizations.Comment: 14 pages with 4 figure

Bessel function expansions of Coulomb wave functions

From the convergence properties of the expansion of the function Φ_l∝r^(−l−1)F_l in powers of the energy, we successively obtain the expansions of F_l and G_l as single series of modified Bessel functions I_(2l+1+n) and K_(2l+1+n), respectively, as well as corresponding asymptotic approximations of G_l for ‖η‖→∞. Both repulsive and attractive fields are considered for real and complex energies as well. The expansion of F_l is not new, but its convergence is given a simpler and corrected proof. The simplest form of the asymptotic approximations obtained for G_l, in the case of a repulsive field and for low positive energies, is compared to an expansion obtained by Abramowitz

De indianendans na Caterpillar

Politici voeren altijd dezelfde zinloze rituelen op als er een multinational uit België wegtrekt

Foreign land ownership: Why are the Polish and Hungarian measures in discrimination with EU citizens’ right to acquire agricultural land within the European Union?

This thesis focuses on the acquisition of agricultural land by foreigners – citizens of other EU Member States – in Poland and Hungary. Land is a fundamental resource of the nation state. Without land, constituting the delimitation of their territory, countries cannot exist. It possesses special features – e.g. limited area, economic importance, evocation of national sentiment and security – which represent much of the wealth of a state and its population. Because of its precious value, states have at different periods taken measures to restrict the possibility of foreigners’ acquiring land within their territories. Traditionally, foreigners, categorized as non-nationals of a state, were not allowed to acquire land. During the feudal period, they were seen as potential enemies to the nations. This attitude was developed and entertained by the special feudal relationship binding the people living within one territory – e.g. tenants were allowed to use their lord’s land and in return they owed him services and a personal obligation of loyalty. Being free of accountableness, foreigners had no attachment to that specific land. Centuries later, the mentality towards foreigners changed. After the French Revolution, the principles of equality and fraternity were highlighted, setting citizens and foreigners on equal footing. Although this trend seems to continue, many states nowadays still restrict foreign land ownership. Within the European context, it can be noticed that even though free movement of persons is one of the cornerstones of the internal market, EU citizens still are sometimes confronted in real life with some infringements on their free movement rights

Sociaal overleg in het onderwijs : mijmeringen

Kritische bedenkingen bij de wijze waarop het sociaal overleg n het onderwijs is geregel

Geen recht op luiheid

Bedrijven die 50-plussers betaald thuis houden, zullen daar een boete voor moeten betalen. Zullen werkgevers de taks afwentelen op de thuisblijvers, of hen aan de deur zetten