We study sustained oscillations in two-dimensional oscillator systems driven by Rayleigh-type negative friction. In particular we investigate the influence of mismatch of the two frequencies. Further we study the influence of external noise and nonlinearity of the conservative forces. Our consideration is restricted to the case that the driving is rather weak and that the forces show only weak ...

The TCP/IP protocol suite was originally designed in late 1970s, and finalized in 1981. Since then, its trans port layer protocols, TCP and UDP, have been rela tively stable. On the other hand, the environment where the protocols work, and the requirements placed upon them, have gradually but constantly changed. So far, it has been possible to cope with the situation by upgrad ing underlying pr...

we study umbilic (space-like) submanifolds of pseudo-riemannian space forms, then define totally semi-umbilic space-like submanifold of pseudo euclidean space and relate this notion to umbilicity. finally we give characterization of total semi-umbilicity for space-like submanifolds contained in pseudo sphere or pseudo hyperbolic space or the light cone.a pseudo-riemannian submanifold m in (a ps...

A new topology is proposed on the space of holonomy equivalence classes of loops, induced by the topology of the space Σ in which the loops are embedded. The possible role for the new topology in the context of the work by Ashtekar et al. is discussed. In this short paper we introduce a topology τ on the space of holonomy equivalence classes of loops, known in the context of quantum gravity in ...

The aim of this paper is to introduce the notion of commutative pseudo BE-algebras and investigate their properties.We generalize some results proved by A. Walendziak for the case of commutative BE-algebras.We prove that the class of commutative pseudo BE-algebras is equivalent to the class of commutative pseudo BCK-algebras. Based on this result, all results holding for commutative pseudo BCK-...

Os autores fazem o relato de três casos clínicos: Papilomatose florida, Epitelioma cuniculatum e Condiloma gigante Buschke Lowenstein, considerados como representativos entidades que compõem grupo das Papilomatoses pseudo-carcinomatosas. São favoráveis à conceituação pseudo-carcinomatosas apoiando-se na semelhança clínica, histopatológica, evolutiva da terapêutica a ser instituída. Discutem, ai...