Spin Structures on Flat Manifolds

The aim of this paper is to present some results about spin structures on flat manifolds. We prove that any finite group can be the holonomy group of a flat spin manifold. Moreover, we shall give some methods of constructing spin structures related to the holonomy representation.     

Study of Amorphous Ferrimagnet Fe0.66Er0.19B0.15 by Means of Monochromatic Circularly Polarised Source

Properties of amorphous alloy Fe_0.66Er_0.19B_0.15 are reported. A reorientation of the Fe and Er magnetic moments during sample cooling through the compensation point in a large magnetic field is found by means of monochromatic circularly polarised radiation. This revised version was published online in August 2006 with corrections to the Cover Date.     

Differential algebra of quantum fermions

Lie coalgebra equips an exterior algebra (algebra of fermions) with a structure of a differential algebra. In similar way we equip an algebra of quantum fermions (quantized exterior algebra) with a structure of a differential algebra. This leads to a notion of a variety of Lie coalgebras for a Hecke braid. This approach is different from that of Gurevich (1988 and 1993), Woronowicz (1989) and of Majid (1993).     

Calibration of PM-355 nuclear track detectors; comparison of track diameter diagrams with track depth characteristics

The calibration diagrams, i.e. track diameters and track depths versus ion energy and etching time, as obtained for PM-355 track detector irradiated with He-ions are presented. The both detector characteristics are compared. The track etch rate is determined by two methods, as a function of the etch pit depth and the ion energy loss.