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As the amount of space debris orbiting the earth is continuously increasing, it is becoming essential to monitor and predict the debris' trajectories in order to avoid collision that could threaten space missions, i.e. operative satellites or manned spacecraft. An innovative bistatic radar system, that couples multi-beaming and ranging techniques, is(More)
In this paper, a quite unique mobile laboratory for monitoring radio-frequency interference with a radio-astronomical observatory is described. The unit is fully operational at the new Sardinia Radio Telescope, a 64-m antenna now in the commissioning phase in Italy. The mobile laboratory is mainly used to identify the source of interference with the radio(More)
A time laboratory was established at the Astronomical Observatory of Cagliari more than one century ago, aimed for time-tagging scientific observations. At present, this laboratory is facing up a deep refurbishment in order to cope with the much tighter specifications on phase noise, time resolution, and frequency stability required by the new scientific(More)
A re-engineering of part of the Northern Cross radiotelescope fur concepts verifications and technology developments fur a next generation radiotelescope (Square Kilometre Array + SKA) is here described. The Northem Cross is an array, composed of 5632 dipoles and represents one of the largest collecting areas in the northern hemisphere (30.000 m’). Such a(More)
We describe a VLBI experiment in which, for the first time, the clock reference is delivered from a National Metrology Institute to a radio telescope using a coherent fibre link 550 km long. The experiment consisted of a 24-hours long geodetic campaign, performed by a network of European telescopes; in one of those (Medicina, Italy) the local clock was(More)
In this paper we present the first results of a project aiming at the mitigation of one of the most pressing problems for observational radio astronomy in Italy and the cm-wavelength telescopes world-wide: the ever-deteriorating situation of Radio Frequency Interference (RFI). We illustrate the campaigns conducted at the Noto 32m radio telescope and the(More)
Optical fiber links offer the best performance to transfer time and frequency. They are beneficial to primary metrology, and there is a strong effort to develop a European network of T&F fiber links. In Italy, we realized a coherent optical fiber link from the National Metrological Institute INRIM to the INAF radio-antennas in Medicina, Bologna and the(More)
Using a cystoscopic light source and methylene blue as the sensitizing dye, photoactivation was examined in two types of experiments. In the first, the in vitro study destruction of two enzymes (glucose-6-phosphate dehydrogenase and lactic dehydrogenase) was examined in suspensions of whole and homogenized tumor cells from a transplantable bladder tumor. In(More)