This study examines whether readers of the paper and online versions of a national newspaper acquire different perceptions of the importance of political issues. Using data from a weeklong experiment in which subjects either read the print version of the New York Times, the online version of that paper, or received no special exposure, this study finds evidence that people exposed to the Times ...

We review geometrical properties of a static spacetime (M, g), including geodesic completeness, causality, standard splittings, compact M , closed geodesics and geodesic connectedness. We pay special attention to the critical quadratic behavior at infinity of the coefficients β, β −1 (β = −g(K, K), being K a timelike irrotational Killing vector field), which essentially control completeness, ca...

We review geometrical properties of a static spacetime (M, g), including geodesic completeness, causality, standard splittings, compact M , closed geodesics and geodesic connectedness. We pay special attention to the critical quadratic behavior at infinity of the coefficients β, β −1 (β = −g(K, K), being K a timelike irrotational Killing vector field), which essentially control completeness, ca...

All diagonal proper Bianchi I space-times are determined which admit certain important symmetries. It is shown that for Homotheties, Conformal motions and Kinematic Self-Similarities the resulting space-times are defined explicitly in terms of a set of parameters whereas Affine Collineations, Ricci Collineations and Curvature Collineations, if they are admitted, they determine the metric modulo...

I show that massive-particle dynamics can be simulated by a weak, external perturbation on a potential flow in an ideal fluid. The perturbation defining a particle is dictated in a small (spherical) region that is otherwise free to roam in the fluid. Here I take it as an external potential that couples to the fluid density or as a rigid distribution of sources with vanishing total out-flux. The...

F or adequate sealant retention, the bonding surface area must be maximized and the enamel clean, free of salivary contamination, and dry at the time of sealant placement.I, 2 However, because pit and fissure sealants bond to the cuspal incline planes and not to the bottoms of the pits and fissures,B_6 insufficient curing of the resin sealant could reduce the bond strength. The purpose of this ...