Lueders' lines detection by means of brittle coatings

The objective of this paper is to compare some of the techniques used to detect Lueders' lines and present the results of a more extensive study using the brittle-coating method. A hot-rolled steel tensile specimen was yielded plastically under successively higher amounts of load and the resulting Lueders' lines were recored using oblique-incident light, etching, photoelastic coatings and brittle coatings. When the results from the various methods were compared, the authors found some advantages in the use of brittle coatings. This method was then used to record the Lueder's lines in beams under pure bending and simple bending, and in plates with notches and holes.     

Synthese und Konformationsuntersuchungen von Poly(S-aminoalkyl-homocysteinen) und deren Benzyloxycarbonyl-Derivaten

Ohne Zusammenfassung     

Stabilization of skyrmions via ϱ-mesons

It is shown that a skyrion can be stabilized by introducing ?-mesons into the chiral SU(2)_L × SU(2)_R lagrangian without higher-derivative terms like the Skyrme term. The ?-mesons are considered as dynamical gauge bosons associated with a hidden local symmetry of the non-linear sigma model. The lagrangian reduces to the Skyrme model in a limit of parameters. The Skyrmion mass M is found to be M = 1058 MeV when the parameters are fixed so as to satisfy the KSRF relation. It is also shown that a solition solution in a model with Ω-meson coupled with the baryonic current is a saddle-point solution.