نتایج جستجو برای: rock mass explosion
تعداد نتایج: 527134 فیلتر نتایج به سال:
We examine the possibility that a nearby supernova explosion could have caused one or more of the mass extinctions identified by paleontologists. We discuss the possible rate of such events in the light of the recent suggested identification of Geminga as a supernova remnant less than 100 parsec (pc) away and the discovery of a millisecond pulsar about 150 pc away and observations of SN 1987A. ...
The flame born in the deep interior of a white dwarf that becomes a Type Ia supernova is subject to several instabilities, the combination of which determines the observational characteristics of the explosion. We briefly review these instabilities and discuss the length scales for which each dominates. Their cumulative effect is to accelerate the speed of the flame beyond its laminar value, bu...
The progenitor of SN 2005cs, in the galaxy M51, is identified in pre-explosion HST ACS WFC imaging. Differential astrometry, with post-explosion ACS HRC F555W images, permitted the identification of the progenitor with an accuracy of 0.006. The progenitor was detected in the F814W pre-explosion image with I = 23.3± 0.2, but was below the detection thresholds of the F435W and F555W images, with ...
We present the first spectropolarimetric observations of a candidate of super-Chandrasekhar mass Type Ia supernova (SN): SN 2009dc. The observations were performed at 5.6 and 89.5 days after the B-band maximum. The data taken at the later epoch are used to determine the interstellar polarization. Continuum polarization is found to be small (< 0.3%), indicating that the explosion is nearly spher...
This paper presents an overview of the plate load techniques that are employed in the assessment of the in situ deformability characteristics of rock masses and the theoretical procedures that can be used to estimate the deformability of the rock mass.
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