We present radio observations at three frequencies and contemporaneous optical monitoring of the peculiar BL Lac object AO 0235+164. During a three-week campaign with the VLA we observed intraday variability in this source and found a distinct peak which can be identified throughout the radio frequencies and tentatively connected to the R-band variations. This event is characterized by unusual ...

We present optical spectroscopy data that allowed a measurement of the redshift for the X-ray selected BL Lacertae object 1517+656. With a redshift of z = 0.702 this object has an absolute magnitude of M B = −26.4 and is also an extremely powerful radio and X-ray source. Although being a high frequency peaked BL Lac, this object is one of the most luminous BL Lac objects known so far. Being als...

We report the first successful measurement (with HST/WFPC2) of a significant proper motion for a m V ∼ 25 object which we had proposed as the optical counterpart of the radio pulsar PSR B0656+14. The yearly displacement of 43±2 mas is highly significant and, while in agreement with early, rougher, radio measurements , stands out for its vastly improved accuracy. Together with the report of a po...

Recently, the use of RFID(Radio Frequency Identification) for object identification is used more often, but the tag collision problem by the use of a radio frequency still exists. Therefore, in this paper, we analyzed tag identification time to minimize tag collisions and improve tag identification time by applying various tag anti-collision algorithms in the suggested method. As a result, we d...

This paper shows a distributed object-oriented architecture to provide GPS data to GIS applications. Data captured in real time by GPS units are sent via radio to the computer. Several sources of this real data in addition to simulated GPS data are distributed in a computer network. These servers of GPS data can be accessed by distributed client applications. A CORBA based infrastructure provid...

EMU is a wide-field radio continuum survey planned for the new Australian Square Kilometre Array Pathfinder (ASKAP) telescope, due to be completed in 2012. The primary goal of EMU is to make a deep (∼10μJy/bm rms) radio continuum survey of the entire Southern Sky at 1.4 GHz, extending as far North as +30◦ declination, with a 10 arcsec resolution. EMU is expected to detect and catalog about 70 m...

We report the detection of the bright radio quiet quasar PG 1416-129 by the OSSE instrument on the Compton Gamma Ray Observatory (CGRO). This object had the hardest spectral index of all known AGN in the energy range 2-20 keV ((= 1:1 0:1) when observed by Ginga. We nd that the source is variable at energies > 50 keV during the OSSE observation, and that the OSSE spectrum is steeper than the Gin...

This paper describes a novel approach for 3D localization of an object based on fusion of the UWB radio localization techniques and UWB Impulse Radar ranging possibilities. We present a 3D localization system which includes five base stations and a TAG, and introduce the principles of our localization method. The simulation and experimental results indicate that the UWB technology based localiz...

We report the detection of a strong jet{cloud interaction at a distance of 120 kpc from the nucleus of the radio galaxy 3C34, which has redshift z = 0:69. Hubble Space Telescope images of the radio galaxy show a long narrow region of blue emission orientated along the radio axis and directed towards a radio hotspot. The William Herschel Telescope has been used to provide long{slit spectroscopic...

We report the detection of a strong jet–cloud interaction at a distance of 120 kpc from the nucleus of the radio galaxy 3C34, which has redshift z = 0.69. Hubble Space Telescope images of the radio galaxy show a long narrow region of blue emission orientated along the radio axis and directed towards a radio hotspot. The William Herschel Telescope has been used to provide long–slit spectroscopic...