LSI +61 303 is an exotic binary system consisting of a 10 M B star and a compact object which is probably a neutron star. The system is associated with the interesting radio source GT 0236+610 that exhibits bright radio outbursts with a period of 26.5 days. We report the results of continuous daily radio interferometric observations of GT 0236+610 at 2.25 and 8.3 GHz from 1994 January to 1996 F...

Gravitational wave detection can be done by precision timing of millisecond pulsars, and (with less likelihood) by precision astrometry on distant objects whose light or radio waves pass through gravitational waves on their way to our observatories. Underlying both of these is the relatively simple theory of light propagation in spacetimes with gravitational waves, which is also the basis of in...

We present 18-cm radio maps of four Seyfert nuclei, Mrk 1, Mrk 3, Mrk 231 and Mrk 463E, made with the European VLBI Network (EVN). Linear radio structures are present in three out of four sources on scales of ∼100 pc to ∼1 kpc, and the 20-mas beam of the EVN enables us to resolve details within the radio structures on scales of < 10 pc. Mrk 3 was also imaged using MERLIN and the data combined w...

Precise modeling of radio propagation is necessary for experiencing the benefits of wireless technology for indoor environments. Among many modeling techniques, the ray tracing based prediction models become popular for indoor wireless radio propagation characterization. Though the ray tracing models are popular, their key deficiency is the slower performance. In this paper, an accelerated tech...

Locating objects is a key requirement in several of the emerging computing paradigms. The problem of locating objects has been extensively studied from a variety of technological and technique-oriented perspectives. Recently, Radio Frequency Identification (RFID), a wireless automated identification technology, has come forth as a viable platform for locating objects, particularly in indoor env...

Abstract Active galactic nuclei (AGN) have been observed as far redshift $z \sim 7$ . They are crucial in investigating the early Universe well growth of supermassive black holes at their centres. Radio-loud AGN with jets seen a small viewing angle called blazars and show relativistic boosting emission. Thus, apparently brighter easier to detect high-redshift Universe. DES J014132.4–542749.9 is...

We present a comprehensive study of the relation between radio and X-ray emission in neutron star X-ray binaries, use this to infer the general properties of the disc–jet coupling in such systems, and compare the results quantitatively with those already established for black hole systems. There are clear qualitative similarities between the two classes of object: hard states below about 1% of ...

We present new BeppoSAX LECS, MECS, and PDS observations of four flat–spectrum radio quasars (FSRQ) having effective spectral indices αro and αox typical of high-energy peaked BL Lacs. Our sources have X–ray–to–radio flux ratios on average ∼ 70 times larger than “classical” FSRQ and lie at the extreme end of the FSRQ X–ray–to–radio flux ratio distribution. The collected data cover the energy ra...