PT Unknown AU Shitov, SV Inatani, J Shan, W Takeda, M Wang, Z Uvarov, AV Ermakov, AB Uzawa, Y TI Measurement of emissivity of the ALMA antenna panel at 840 GHz using NbN-based heterodyne SIS receiver SE Proc. 19[super:th] Int. Symp. Space Terahertz Technol. PY 2008 BP 263 EP 266 DE SIS mixer; reflection; emissivity; mirror; space telescope; space observatory ER