A two stages cryogenic silicon-germanium heterojunction-bipolar-transistor(SiGe HBT)low-nose-amplifier(LNA)for 0.2-4GHz frequency range has been designed,fa
Chinese Spectral Radio Heliograph(CSRH)is an advanced synthesis aperture solar radioheliograph,developed by National Astronomical Observatories,Chinese Acad
We present results of millimeter line observations toward four nearby gas-rich galaxies(NGC3079,NGC4258,NGC6240,and VIIZW31)with the IRAM 30 meter millimete