Radar imaging results for Mercury’s non-polar regions are presented. The dual-polarization, delay-Doppler images were obtained from several years of observations with the upgraded Arecibo S-band (λ12.6-cm) radar telescope. The images are dominated by radar-bright features associated with fresh impact craters. As was found from earlier Goldstone-VLA and pre-upgrade Arecibo imaging, three of the ...

The recent discovery of an X-ray jet in the z=4.3 quasar GB 1508+5714 by Yuan et al. (astro-ph/0309318) and Siemiginowska et al. (astro-ph/0310241) prompted a search for its radio counterpart. Here, we report the successful discovery of faint radio emission from the jet at 1.4 GHz using archival VLA data. Possible interpretations of the X-ray jet as synchrotron or inverse Compton emission off t...

We have identiÐed a likely radio counterpart to the low-mass X-ray binary MXB 1730[335 (the Rapid Burster). The counterpart has shown 8.4 GHz radio on/o† behavior correlated with the X-ray on/o† behavior as observed by the RXT E/ASM during six VLA observations. The probability of an unrelated, randomly varying background source duplicating this behavior is 1%È3% depending on the correlation tim...

The firefighter problem (FFP) is used as a model to simulate how a fire breaks out and spreads to its surroundings over a discrete time period. The goal is to deploy a given number of firefighters on strategic points at each time step to contain the fire in a most efficient way, so that as many areas are saved from the fire as possible. In this paper we introduce a new solution representation f...

If the large-scale galaxy distribution is lamentary, as suggested by some observations and recent hydrodynamical simulations, then lengthwise views of laments will apparently produce compact groups (CGs) that are in reality stretched out along the line of sight. This possibility has been advocated recently by Hernquist, Katz & Weinberg (1994). Here, we propose a test for this hypothesis using X...

The degree of beaming in Gamma-Ray Bursts (GRBs) is currently unknown. The uncertainty in the γ-ray beaming angle, θb, leaves the total energy release (∝ θ2 b) and the event rate per galaxy (∝ θ b ) unknown to within orders of magnitude. Since the delayed radio emission of GRB sources originates from a mildly relativistic shock and receives only weak relativistic beaming, the rate of radio-sele...

Most symbiotic stars consist of a white dwarf accreting material from the wind of a red giant. A growing number of these objects have been found to produce jets. Analysis of archival Chandra data of the symbiotic system CH Cygni reveals faint extended emission to the south, aligned with the optical and radio jets seen in earlier HST and VLA observations. CH Cygni thus contains only the second k...

This paper starts with the characteristics and advantages of microwaves processing. The shortcomings of fixed frequency, typically at 2.45 GHz were also mentioned. On account of this, the newly developed variable frequency microwave (VFM) fabrication was mentioned and adopted in place of the fixed frequency process. Two cases of fixed frequency microwave processing of materials were described; ...

The purpose of this study was to evaluate the white-matter changes associated with cranial radiation by MR imaging. The MR scans of 95 patients receiving conventional external beam radiation for a wide variety of central nervous system tumors were reviewed. Moderately T2-weighted spin-echo images with a 2000-msec repetition time and 56-msec-echo time were analyzed for white-matter abnormalities...

Solar radiation is a critical variable in global change sciences. While most of the current global datasets provide only the total downward solar radiation, we aim to develop a method to estimate the downward global land surface solar radiation and its partitioned direct and diffuse components, which provide the necessary key meteorological inputs for most land surface models. We developed a si...