Second order anti-holonomic jets as anti-symmetric parts of second order semi-holonomic jets are introduced. The anti-holonomic nature of the Lie bracket is shown. A general result on universality of the Lie bracket is proved. 1. Introduction The concepts of non-holonomic (or iterated) and semi-holonomic jets, rst introduced by Ehresmann in 1], are commonly used in diierential geometry. In this...

This paper summarizes some of our recent projects which try to illuminate the nature and importance of jets associated with active nuclei and compact objects. After a short introduction on jets in radio galaxies and radio loud quasars the paper focuses on jets in other source types, such as radio-quiet quasars, Seyfert and LINER galaxies, and stellar mass black holes. Radio observations of quas...

In this paper we present a numerical study of plasma jets produced by intense laser matter interactions. Through this study we hope to better understand astrophysical jets and their recent experimental simulations in the laboratory. We paid special attention to radiation cooling and the interaction of the jet with ambient gas. Four cases are presented in this paper; two of them deal with the pr...

Inclusive particle production in quark and gluon jets classiied via energy-ordering has been investigated in 3-jet events at the Z 0 pole. The events were selected using various jet nding algorithms. The jets with higher energies were assumed to be quark jets and the jet with lowest energy to be the gluon jet. Using the same jet nder a similar energy dependence of jet purities has been found fo...

I propose a model for the formation of slow-massive-wide (SMW) jets by accretion disks around compact objects. This study is motivated by claims for the existence of SMW jets in some astrophysical objects such as in planetary nebulae (PNs) and in some active galactic nuclei in galaxies and in cooling flow clusters. In this model the energy still comes from accretion onto a compact object. The a...

wall-jet flow is an important flow field in hydraulic engineering, and its applications include flow from the bottom outlet of dams and sluice gates. in this paper, the plane turbulent wall jet in shallow tailwater is simulated by solving the reynolds averaged navier-stokes equations using the standard  turbulence closure model. this study aims to explore the ability of a time splitting method ...

Multiplicity of sets of soft jets with energies ranging in some interval is determined. The possible role of collective effects is discussed. The phenomenon of jet emission is well known in QCD and firmly established in experiment. The two-jet events in e + e −-annihilation provide us with unique possibility to measure jets with fixed energy equal to that of colliding particles. In all other ca...

The jets of GRS 1915+105 carry a considerable energy away from the central source into the ISM. The similarity of the jets of this source and jets in radio galaxies or radio-loud quasars suggests that we should detect large-scale, synchrotron emitting radio structures surrounding GRS 1915+105. However, these large structures have not been found. We show that by adapting a model for the radio lo...