Preses

The extended de finitions must prese rve as many of the properties of the backbone/spine as possible.
Spines of Random Constraint Satisfaction Problems: Definition and Connection with Computational Complexity

All these features con firm that the prese nt Q2 domain covers the transition from the regime where soft diffraction dominates light VM production to the regime where hard diffraction dominates.
Diffractive Electroproduction of rho and phi Mesons at HERA

Obviously then, a choice of inflows (v < 0) or out flows (v > 0) has to be made at the very beginning (at t = 0, as it were), and solutions generated thereafter will be free of all the difficulties associated with the prese nce of a saddle point in the stationary flow.
Implications of nonlinearity for spherically symmetric accretion

All the results, both positive and negative, that we prese nt below are for problems of this sort unless indicated otherwise.
Inverse problems in approximate uniform generation

The numerical model of R–T instabilities prese nted in figure 4 in O’Dell & Burkert (1997) seems to support this model; it shows elongated structures pointing radially to the centre of the nebula.
Photoevaporating flows from the cometary knots in the Helix nebula (NGC 7293)