As part of an initiative to reduce the size, weight, and complexity of radio astronomy receivers and to place the conversion from analog to digital signals as close to the telescope feed as possible, a prototype single-conversion, sideband-separating mixer receiver with a tunable local oscillator (LO) between 5 and 9 GHz has been built and tested. After straightforward gain and phase calibratio...

of Superconductor-Isolator-Superconductor Mixers and Its Effect on Mixing Performance Wenlei SHAN, Mingjye WANG, Shengcai SHI, Yoshihisa IRIMAJIRI and Takeshi NOGUCHI Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Nobeyama, Nagano 384-1305, Japan Purple Mountain Observatory, National Astronomical Observatories of China, Nanjing 210008, China Institute of Astronomy and A...

A more detailed analysis is made of the energy spectrum of the diffuse component of extragalactic gamma rays over the range of 0.3- 10 GeV, obtained fromthe EGRET instrument at the Compton Gamma Ray Observatory. The derived excess energy spectrum of high galactic latitude, b > 60°, using intercept method shows that it is correlated with Virgo cluster (over lsr) and average Virgo intensity i...

Processes controlling the concentration of hydroperoxides at Jungfraujoch Observatory, Switzerland S. J. Walker, M. J. Evans, A. V. Jackson, M. Steinbacher, C. Zellweger, and J. B. McQuaid Institute for Atmospheric Science, School of the Earth and Environment, University of Leeds, Leeds, United Kingdom Swiss Federal Institute for Materials Science and Technology (Empa), Laboratory for Air Pollu...

Voting is one of the primary foundations of democracy. Existing voting legislation and non-electronic voting systems have been developed over the years in a way that ensures that the principles required for democratic elections and referendums are met. The significance of these issues is clearly manifested by the volume of debate, which lately has begun on them as well as by the increased numbe...

A. B. McDonald Physics Department Queen's University Kingston, Ontario CANADA K7L 3N6 For the SNO Collaboration e-mail [email protected] Abstract The Sudbury Neutrino Observatory uses 1000 tonnes of heavy water in an ultraclean Cherenkov detector situated 2 km underground in Ontario, Canada to study neutrinos from the Sun and other astrophysical sources. The Charged Current (CC) reaction on deuteri...

Measurements of microwave attenuation at room temperature and 4.2 K have been performed on some conductors commonly used in receiver input circuits. The reduction in loss on cooling is substantial, particularly for copper and plated gold, both of which showed a factor of 3 loss reduction. Copper passivated with benzotriazole shows the same loss as without passivation. The residual resistivity r...