Stochastic recourse models, Decomposition, Successive approximation, 90C15 Stochastic programming,

Unmanned aerial vehicles (UAVs) are used nowadays in a wide range of applications, including monitoring, mapping, or surveying tasks, involving magnetic field mapping, mainly for geological and geophysical purposes. However, thanks to the integration of ultrasound-aided navigation used for indoor UAV flight planning and development in sensorics, the acquired magnetic field images can be further used, for example, to enhance indoor UAV navigation based on the physical quantities of the image or for the identification of risk areas in manufacturing or industrial halls, where workers can be exposed to high values of electromagnetic fields. The knowledge of the spatial distribution of magnetic fields can also provide valuable information from the perspective of the technical cleanliness. This paper presents results achieved with the original fluxgate magnetometer developed and specially modified for integration on the UAV. Since the magnetometer had a wider frequency range of measurement, up to 250 Hz, the DC (Direct Current) magnetic field and low frequency industrial components could be evaluated. From the obtained data, 3D magnetic field images using spline interpolation algorithms written in the Python programming language were created. The visualization of the measured magnetic field in the 3D plots offer an innovative view of the spatial distribution of the magnetic field in the area of interest.

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This article builds on work published in the Journal of Cold War Studies in 2003 by James G. Hershberg, who presented newly released archival evidence from Budapest and Warsaw concerning the role that Hungary and Poland played as intermediaries between Washington and Hanoi during the 37-day pause in the U.S. bombing campaign against North Vietnam in December 1965 and January 1966. The evidence presented here, drawing on unpublished Hungarian (and partly unpublished U.S.) archival sources, refines some of Hershberg's conclusions and sheds new light on Budapest's mediatory attempt as well as Hungary's role in the Vietnam conflict. The article provides the first critical appraisal of Delusion and Reality, the 1978 book by János Radványi, Hungary's former chargé d'affaires in Washington. For 25 years, Radványi's book constituted the only available Soviet-bloc account of the secret Communist peace efforts during the Vietnam War.