We have observed dwarf nova oscillations (DNOs) in OY Car during outburst, down through decline and beyond; its behaviour is similar to what we have previously seen in VW Hyi, making it only the second dwarf nova to have DNOs late in outburst that continue well into quiescence. There are also occasional examples of DNOs in deep quiescence, well away from outburst – they have properties similar ...

The geological structure of coal mines has always been a dangerous object attention in mine outburst prevention work. In order to realize safety information management and early warning gas disasters, comprehensive use theory, disaster computer technology other analysis methods, considering the influence structure, seam occurrence parameters, an indicator system for identifying risk outbursts r...