We present first results of three-dimensional (3D-) calculations of turbulent and degenerate hydrogen-burning on top of a C+O white dwarf of 1.0 M . The simulations are carried out by means of a code which solves Euler’s equation for an arbitrary equation of state together with a nuclear reaction network and the energy input from nuclear reactions on a Cartesian grid covering a fraction of the ...

We present first results of three-dimensional (3D-) calculations of turbulent and degenerate hydrogenburning on top of a C+O white dwarf of 1.0 M⊙. The simulations are carried out by means of a code which solves Euler’s equation for an arbitrary equation of state together with a nuclear reaction network and the energy input from nuclear reactions on a Cartesian grid covering a fraction of the w...

We present new observations of the fundamental rovibrational CO spectrum of V1647 Ori, the young star whose recent outburst illuminated McNeil’s Nebula. Previous spectra, acquired during outburst in 2004 February and July, had shown the CO emission lines to be broad and centrally peaked, similar to the CO spectrum of a typical classical T Tauri star. In this Letter, we present CO spectra acquir...

Aims. We report spectra of the overtone and fundamental bands of CO in the eruptive variable V838 Mon, which trace the recent evolution of the star and allow its ejecta to be characterized. Methods. The data were obtained at the United Kingdom Infrared Telescope on fourteen nights from 2002 January, shortly after the first outburst of the star, to 2006 April. Results. Although the near-infrared...

There are many coal seams in high-gas mining area of China. The permeability is low. The gas extraction from the original coal seam is difficult and the commercial value is little. The conception of the safe high-efficient exploitation of coal and gas is put forward in this article. It changes the conventional exploitation sequence that is from the upper to below. When we exploit coal seams, th...

We use a 54.4 ks Chandra observation to study nuclear outflow activity in NGC 4552 (M89), an elliptical galaxy in the Virgo Cluster. Chandra images in the 0.5 − 2 keV band show two ring-like features ∼ 1.7kpc in diameter in the core of NGC 4552, as reported previously by Filho et al. We use spherically symmetric point explosion shock models to argue that the shape of the surface brightness prof...

objective: many behavioral problems are resulting from inappropriate parenting styles and inattention to behavioral-emotional difficulties in childhood. the purpose of this research was to examine the relationship between parenting styles and dimensions of children's maladaptive behaviors. methods: 120 six-year old boys, who were enrolled in the first grade of elementary school, were selec...

Classical novae participate in the cycle of Galactic chemical evolution in which grains and metal enriched gas in their ejecta, supplementing those of supernovae, AGB stars, and WolfRayet stars, are a source of heavy elements for the ISM. Once in the diffuse gas, this material is mixed with the existing gases and then incorporated into young stars and planetary systems during star formation. In...

Outburst closed distance coal seam distances are extremely difficult to mine, and commonly involved in safety accidents the process of mining. Based on engineering background Wulan Coal Mine at western margin Ordos Basin, this paper presents a theoretical analysis, analogies, numerical simulations determine optimal mining sequence for #7, #8, #2, #3 seams. Floor penetration drilling was used el...

Abstract The BL Lacertae OJ 287 is a supermassive black hole binary system with complex physics of its irregular flares. During 2016 October–2017 April, surprising outburst in the X-ray, UV, and optical bands was detected, while no variability seen ? -ray light curve. outburst, X-ray curves were dominated by soft X-rays, whose peak luminosity ?10 46 erg s ?1 —more than 10 times higher mean leve...