An improved design, which employs the integration of optic, mechanical and electronic technologies for the next generation large radio telescope, is presented i
The conception of flexible constraint is proposed in the paper. The solution of flexible constraint is in special range, and maybe different in different instan
The effects of trace content of Pb and Bi elements on the spreading property and the strength of brazed joints of Ag-Cu-Zn filler metal have been studied. The r