The first PDF moments for three dynamical flavors in BChPT

We present a calculation of generalized baryon form factors in the framework of three-flavor covariant baryon chiral perturbation theory at leading one-loop order, necessary for the calculation of the first moments of generalized parton distribution functions. The formulae we derive can be used to guide the chiral extrapolation of three-flavor lattice calculations of the corresponding QCD matrix elements.     

Identification of the Nonlinear Restoring Force Characteristic of a Rubber Mounting

This paper is concerned with the identification of the nonlinear restoring force characteristic of a rubber mounting that is part of an oscillator which is subjected to harmonic force excitation. A linearity test is successfully applied to the experimental data to detect the nonlinear behaviour of the system. It is shown that the results of linear system identification depend on the level of excitation force applied. Furthermore, the frequency response functions of the identified linear models only poorly match the measured ones. In consequence, a parametric nonlinear spring characteristic is introduced into the linear model. It is demonstrated that only one set of parameters is required to explain the system behaviour at different levels of excitation force. Also, each of the measured frequency response functions is matched more closely by the calculated frequency response of the nonlinear model.     

Organic Fluorine Compounds and Their Uses as Molecular MR-Based Temperature Sensors

The interest in fluorinated substances has increased significantly in recent decades due to their diverse properties and possible uses. An important analytical method in this context is NMR spectroscopy, which provides information on the structure as well as on intermolecular interactions or generally on changes in the environment of the nucleus under consideration. A physical quantity that is of great importance in most studies is temperature. However, this is not always easy, e. g. in shielded systems or within an organism. However, the application potential in chemical reactors or in medical diagnosis and therapy is very high and for this reason 13 fluorinated organic compound were chosen for a first ¹⁹F NMR signal temperature sensitivity examination for determination of local temperatures in solution. Polyfluorinated molecules with separate ¹⁹F MR signals are particularly suitable for temperature determination. Those can be serve as internal error-correcting thermometers without the need of a reference substance. Under these conditions, a ¹⁹F MR signal shift of up to 0.03 ppm/K was detectable. Fluorine position and chemical environment were very important for the temperature sensitivity.