During this study, a device was developed which is capable of measuring the friction coefficient between two macroscopic solid samples for different rotation angles. It is based on an Anton Paar...Show moreDuring this study, a device was developed which is capable of measuring the friction coefficient between two macroscopic solid samples for different rotation angles. It is based on an Anton Paar rheometer. It can measure torques ranging from 10 nNm up to 200 mNm, while controlling the rotation angle with a minimum resolution of 10 nrad. The normal load exerted on the samples can be controlled with mN accuracy. Measurements on HOPG and silicon dioxide have verified that the instrument works and is capable of measuring very low friction coefficients as a function of the rotation angle between the two samples. The obtained friction coefficients are in agreement with values found in literature.Show less
The Low energy effective Lagrangian of a supersymmetric variation of a Yang--Mills--Higgs Lagrangian, will be derived, where both Lagrangians are still N=2 supersymmetric massless Lagrangians. The...Show moreThe Low energy effective Lagrangian of a supersymmetric variation of a Yang--Mills--Higgs Lagrangian, will be derived, where both Lagrangians are still N=2 supersymmetric massless Lagrangians. The effective Lagrangian is the fixed in a couple of steps in an indirect way. First quantum field theoretic perturbation theory is used for asymptotic behaviour near some identified singularities. Then, with the use of a family of cubic curves as manifolds, and some complex analysis on holomorphic functions, the effective Lagrangian is fixed.Show less
