X-ray Pulsations in the Supersoft X-ray Binary CAL 83

X-ray data reveal that the supersoft X-ray binary CAL 83 exhibits 38.4 minute pulsations at some epochs. These X-ray variations are similar to those found in some novae and are likely to be caused by nonradial pulsations the white dwarf. This is the first detection of pulsations in a classical supersoft X-ray binary.Comment: revised text; 11 pages and 3 figures; accepted for publication in the Astronomical Journa

The soft x ray transient Cen X-4 in quiescence

The initial goal of this project was to examine the quiescent X-ray light curve of the recurrent X-ray/optical nova Cen X-4 throughout its 15.1-hr orbital period. Using these observations the pre-outburst conditions of the binary would be investigated and the relationship between soft X-ray transients and persistent low-mass X-ray binaries would be established. ROSAT-PSPC observations were scheduled for 1991 August 9-13. Unfortunately, failure of the satellite's attitude control system near the end of the all-sky survey severely curtailed science operations for much of 1991, and the requested observations of Cen X-4 were never taken. Since the stated goal could not be accomplished, the time and resources of this project were used in support of two other ROSAT programs for which I am co-investigator: 'Identification of LMC X-ray Sources Using ROSAT-HRI Images' and 'X-ray Light Curve for an Eclipsing Black-Hole Binary'. The results of these investigations are described

Explaining coherence in international regime complexes: How the World Bank shapes the field of multilateral development finance

The landscape of multilateral development finance has changed dramatically in the past decades. At Bretton Woods, delegates envisioned the World Bank as the focal organization mobilizing financial support for national development strategies. Today, this issue area is populated by no less than 27 multilateral development banks including the Asian Infrastructure Investment Bank and the New Development Bank created under Chinese leadership. This paper shows that, despite this institutional proliferation, the development finance regime remains largely coherent and core governance features designed at Bretton Woods continue to shape the emerging regime complex. We develop a historical institutionalist argument for why newly created institutions are likely to imitate extant institutions. We suggest that states add new institutions not only in response to deficiencies in extant institutions but also to increase their control and reputation. We analyze three causal pathways - path-dependence, orchestration, and independent learning - that contribute to a coherent regime complex. We show that focal international organizations can use their position to prevent incoherence

Global Democracy in Decline? How Rising Authoritarianism Limits Democratic Control over International Institutions

Over the past decade, rising authoritarian regimes have begun to challenge the liberal international order. This challenge is particularly pronounced in the field of multilateral development finance, where China and its coalition partners from Brazil, Russia, India, and South Africa have created two new multilateral development banks. This article argues that China and its partners have used the New Development Bank and the Asian Infrastructure Investment Bank to increase their power and to restrict democratic control mechanisms. By comparing formal mechanisms of democratic control in both organizations to the World Bank, this article shows that civil society access, transparency, and accountability are lower at the AIIB and NDB than they are at the World Bank

Wirkung des Gemengeanbaus mit Körnerleguminosen sowie der Standraumzuteilung und der Saatstärke auf Kornertrag und Kornproteingehalt von Winterweizen

In stockless organic farms it is difficult to produce winter wheat (Triticum aestivum L.) with high protein content. The objective of this study was to evaluate the effects of intercropping of (i) winter wheat with either winter field bean (Vicia faba L.) or winter pea (Pisum sativum L.), (ii) the spatial arrangement (mixed, row or row-strip intercrop) and (iii) the seeding rate of the wheat (100 or 20 %) on yield formation and grain protein content. Monocropped wheat planted at a seeding rate of 20 % significantly out-yielded monocropped wheat at 100 % seeding rate because of a more efficient use of the mineral nitrogen (N) in soil. A gradient in the spatial and temporal use of mineral soil N by the wheat was found. N was available in particular from deeper soil layers during the grain filling phase in row strip intercrop trials, resulting in a higher grain protein content of the wheat. Monocropped wheat achieved mean protein content levels of 9,9 and 9,4 % at two different sites and protein content increased significantly in mixture (mean: 12,8 and 11,4 %). The highest protein content of 15,4 % was achieved with the row strip intercrop of field bean