The Global Positioning System (GPS) user makes use of the navigation message transmitted from GPS satellites to achieve its location. Because the receiver uses the satellite's location in position calculations, an ephemeris error, a difference between the expected and actual orbital position of a GPS satellite, reduces user accuracy. The influence extent is decided by the precision of broadcast ephemeris from the control station upload. Simulation analysis with the Yuma almanac show that maxi...| ADS
The rates of a number of homogeneous gas phase reactions likely to occur in dense interstellar clouds composed primarily of molecular hydrogen are considered. Over 100 reactions are included; of these, more than half have known rate constants. These reactions are sufficient to produce and destroy polyatomic species such as H2O, HCN, NH3, and H2CO. Steady-state abundances of about 35 species are calculated for clouds of density 1 0 < < 106 cm -3. Calculations are performed for cosmic-ray-induc...| ADS
The authors use an approximate analytic theory of a thick accretion disk to derive the thermodynamic conditions which prevail inside the disk as a function of the black hole mass, the viscosity parameter, and the accretion rate. From these thermodynamic conditions it is shown that, for a given mechanism for viscosity, the nuclear burning is substantially greater when the central black hole is less massive. The authors also perform a preliminary analysis of the main nuclear processes which can...| ADS
We theoretically demonstrate that adding an easy-axis magnetic anisotropy facilitates magnon condensation in thin yttrium iron garnet (YIG) films. Dipolar interactions in a quasi-equilibrium state stabilize room-temperature magnon condensation in YIG. Even though the out-of-plane easy-axis anisotropy generally competes with the dipolar interactions, we show that adding such magnetic anisotropy may even assist the generation of the magnon condensate electrically via the spin-transfer torque me...| ADS
The Snake is a remarkable Galactic Centre radio filament with a morphology characterized by two kinks along its ~20 arcmin extent. The major and minor kinks are located where the filament is most distorted from a linear magnetized structure running perpendicular to the Galactic plane. We present Chandra, VLA, and MeerKAT data and report the detection of an X-ray and radio source at the location of the major kink. High-resolution radio images of the major kink reveal a compact source with a st...| ADS
