Fifteen years monitoring of extragalactic radio sources at 22
Fifteen years monitoring of extragalactic radio sources at 22
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DOI:
10.1051/aas:1998297
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发表时间:
1998-11
期刊:
影响因子:
--
通讯作者:
M. Tornikoski;A. Mujunen
中科院分区:
文献类型:
--
作者:
M. Tornikoski;A. Mujunen
A high-pressure discharge lamp having a hydrogen getter in the lamp vessel disposed in a metal envelope which is hydrogen-permeable. The hydrogen-permeable metal of the envelope is covered with a porous halogen-resistant layer. The atoms of the metal halides dissociated in the discharge can recombine at the porous layer so that blackening of the discharge vessel is mitigated.