The fact that we apparently live in an accelerating universe places limitations on where humans might visit. If the current energy density of the universe is dominated by a cosmological constant, a rocket could reach a galaxy observed today at a redshift of 1.7 on a one-way journey or merely 0.65 on a round trip. Unfortunately these maximal trips are impractical as they require an infinite prop...

Original Research Arrhythmia and Electrophysiology Cause of Death and Predictors of All-Cause Mortality in Anticoagulated Patients With Nonvalvular Atrial Fibrillation: Data From ROCKET AF Sean D. Pokorney, Jonathan P. Piccini, Susanna R. Stevens, Manesh R. Patel, Karen S. Pieper, Jonathan L. Halperin, Günter Breithardt, Daniel E. Singer, Graeme J. Hankey, Werner Hacke, Richard C. Becker, Scott...

waldenstrom's macroglobulinemia was studied in a 46 year old iranian male with anemia, bleeding, ecchymose and splenomegaly. the diagnosis of macroglobulinemia was established by the presence of veryhigh level of igm paraprotein in sera which was detectable by imrnunoelectrophoresis and rocket immunoelectrophoresis, and by the presence of bone marrow infiltration of plasmoc ytes. family studies...

This paper presents the results of an effort to optimize a conceptual design of a conical (wingedcone) single-stage-to-orbit launch vehicle. The vehicle employs a rocket-based combined-cycle (RBCC) engine capable of four different operating modes ejector, ramjet, scramjet, and rocket. The RBCC engine offers higher engine thrust-to-weight ratios than competing airbreathing engine cycles while ma...

The most potentially powerful objection to the possibility of time travel stems from the fact that it can, under the right conditions, give rise to closed causal loops, and closed causal loops can be turned into self-defeating causal chains; folks killing their infant selves, setting out to destroy the world before they were born, and the like. It used to be thought that such chains present par...

This paper is concerned with the idea of a significant improvement state-of-the-art short-range rockets by means using rocket artillery systems. Such system consists launcher aircraft (RLA) and drone-launched short range (DLSRR). An RLA reusable first stage military rocket. A DLSRR expendable second stage, which flies to target. RLA-DLSRR systems have not yet been built, but they described in p...