The black hole candidate XTE J1817-330 was discovered in outburst on 26 January 2006 with RXTE/ASM. One year later, on 28 February 2007, another X-ray transient discovered in 1996, XTE J1856+053, was detected by RXTE during a new outburst. We report on the spectra obtained by XMM-Newton of these two black hole candidates.

doi:10.1017/mdh.2016.122 Merrilyn Murnane, Honourable Healers: Pioneering Women Doctors Elizabeth Blackwell, Elizabeth Garrett Anderson and Constance Stone, (Melbourne: Australian Scholarly, 2015), pp. xvi, 225, A $33.95, hardback, ISBN: 978-1925-333-053. Beulah Bewley, My Life as a Woman and Doctor, Susan Bewley (ed.) (Bristol: SilverWood, 2016), pp. 235, £25.00, hardback, ISBN: 978-1-78132-41...

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The computational solution of large scale linear programming problems contains various difficulties. One of the difficulties is to ensure numerical stability. There is another difficulty of a different nature, namely the original data, contains errors as well. In this paper, we show that the effect of the random errors in the original data has a diminishing tendency for the optimal value as the...

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