Adopting yellow mud as barrier layer materials, coal and gas delay outburst experiments under conditions of geostress accumulation disturbance were carried out by using self-developed simulation system, to find roles pressure played in the process ways predict it, through analysis variations pressure, AE characteristics during process. The results show that after increased 0.11 MPa from 1.80 MP...

We report six BeppoSAX X–ray observations of VW Hyi during and after the outburst of Sep 23 1998. The outburst flux is lower than the quiescent flux in the entire observed energy band (0.1–10 keV), in agreement with earlier observations. The X–ray spectra are fitted with two-temperature plasma and cooling flow spectral models. These fits show a clear spectral evolution in X–rays for the first t...

I propose that the properties of the two outbursts observed in the X-ray transient XTE J1118+480 in 2000 are akin to super-outbursts of SU UMa stars. In these systems a 'normal' outburst immediately precedes a 5–10 times longer ('super')outburst. The optical light curve of the outbursts of XTE J1118+480 is remarkably similar to that seen in some SU UMa stars, such as UV Per and T Leo, where the...

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 ...

W Comae has significant variability in multi-wavelengthes, from the radio to the gamma-ray bands. A bright outburst in the optical and X-ray bands was observed in 1998, and most recently, a strong TeV flare was detected by VERITAS in 2008. It is the first TeV intermediate-frequency-peaked BL Lacertae (IBL) source. I find that both the broadband spectral energy distributions (SEDs) quasi-simulta...