Experimental and calculated absolute differential cross sections for the scattering of low-energy electrons from ethene are presented. Emphasis is on the excitation of the ã B1u 3 , state, but selected elastic and vibrational excitation cross sections are also given. In contrast to earlier calculations, which were nearly a factor of 2 too large, the present calculation agrees very well with the...

The scalar and vector leptoquark pair production cross sections in hadronic collisions are calculated. In a model independent analysis we consider the most general C and P conserving couplings of gluons to both scalar and vector leptoquarks described by an effective low–energy Lagangian which obeys SU(3)c invariance. Analytrical expressions are derived for the differential and integral scatteri...

This paper describes a new method for generation of topologically correct surfaces of branching tubular structures with given centerlines and radii. As the centerlines are not straight lines, the cross sections are not parallel and well known algorithms for surface tiling from parallel cross-sections cannot be used. Non-parallel cross sections can be tiled by means of the maximal-disc interpola...

In recent years special attention has been devoted to the problem of finding a copula, the diagonal section and opposite diagonal section of which are known. For given diagonal function and opposite diagonal functions, we provide necessary and sufficient conditions for the existence of a copula to have these functions as diagonal and opposite diagonal sections. We make use of techniques related...