Movement analyses of ball bearings with regard to stable and unstable cage motion behavior are often conducted by simulations, typically by investigating the cage whirl. Some experimental studies exist in which the cage is modified in order to capture its movement with sensors. This paper presents an image-based approach for investigating the cage motion without modifications, which in turn allows a cage motion analysis of an angular contact ball bearing under operation condition. Two new image evaluation algorithms are presented in detail and their suitability is verified by experiments on a bearing test rig.
Botswana has defied typical predictions scholars assign to countries that are wholly dependent on natural resources. Indeed, the country has succeeded in maintaining control of its natural wealth in diamonds, while effectively using this financial boon to establish a stable society. But how did Botswana succeed where so many other resource-rich African states have failed? I argue that the most prominent factors in Botswana’s success were astute leadership capable of garnering legitimacy through strategic economic and social management; Botswana’s ethnic homogeneity and the effective construction of a national identity; as well as the overall growth in standards of living promoted by the government’s sound financial and economic decisions. Despite identifying these accomplishments, I will introduce several looming concerns for Botswana’s political situation – including the country’s high unemployment rate, over-dependence on diamonds, as well as foreign policy dynamics that could provoke tumult in the nation. In the end, this paper should provide a snapshot of Botswana’s trajectory, and the elements that contributed to its impressively peaceful political climate, as well as a note of caution regarding possible dangers on the horizon.
This article introduces the concept of a scholar‐entrepreneurial organization (SEO), defined as an entrepreneurial venture within an academic institution. We explore the case of the Negotiation Task Force (NTF), an SEO hosted at Harvard University’s Davis Center for Russian and Eurasian Studies. Equipped with university seed funding, the NTF is intended to be self‐funded at the end of its 36‐month incubation period. We explain the NTF’s mission, minimum viable products, history, and now established flagship programs; explore the challenges and opportunities that a scholarly startup confronts; and conclude with recommendations for others seeking to launch an SEO.
This article introduces two new datasets detailing shifts in alliances and alignments in Europe throughout the century prior to the Peace of Westphalia. The datasets identify a list of key actors in the European sphere during this time period and introduce two ways of tracking diplomatic shifts. The Formal Military Alliances and Political Settlements dataset (fmaps) lists all formal treaties and agreements reached between major actors in the European sphere that codified a form of alliance among them and for which a start and end year could be identified. The Alignments During Armed Conflicts Dataset (adacs) lists parties’ alignments during the period’s major armed conflicts. Both datasets were compiled through review of available literature about diplomatic ententes and armed conflicts throughout the period from 1528 to 1648. While the article outlines a few potential weaknesses of the datasets, the authors demonstrate their value for historical and social science research, as well as network analysis.
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