نتایج جستجو برای: the line 7219
تعداد نتایج: 16098329 فیلتر نتایج به سال:
In this Letter we use the unprecedented spatial resolution of the Chandra X-Ray Observatory to carry out, for the first time, a measurement of the post-shock electron temperature and proper motion of a young SNR, specifically to address questions about the post-shock partition of energy among electrons, ions, and cosmic rays. The expansion rate, 0.100% ± 0.025%yr, and inferred age, ∼1000 yr, of...
the purpose of this study is to investigate the relationships between teachers’ immediacy behaviors and iranian students’ willingness to talk in english classes. analysis of the results from willingness to talk scale represents a relatively high level of willingness to talk in english classrooms among iranian language learners. the total mean score of students’ willingness to talk was 66.3 ou...
Abstract The centroid energy of the Fe K α line has been used to identify progenitors supernova remnants (SNRs). These investigations generally considered derived from spectrum entire remnant. Here we use XMM-Newton data investigate in 6 SNRs: 3C 397, N132D, W49B, DEM L71, 1E 0102.2-7219, and Kes 73. In 73 fail detect any emission. We report a tentative first detection emission SNR L71 with con...
methodology non-native participants in this study were sixty ba students majoring in english literature and teaching english as a foreign language at khayyam university of mashhad. they were senior students, between 21 to 24 years old, who had studied english for at least three and a half years and had passed several courses including grammar, reading, conversation, and writing. this was assum...
Chandra High Energy Transmission Grating Spectrometer observations of the supernova remnant 1E 0102.2-7219 in the Small Magellanic Cloud reveal a spectrum dominated by X-ray emission lines from hydrogen-like and helium-like ions of oxygen, neon, magnesium and silicon, with little iron. The dispersed spectrum shows a series of monochromatic images of the source in the light of individual spectra...
Abstract This paper carried out the environmental and economic evaluation for hydrogen storage technologies on sedan with Type 3 4 high-pressured cryogenic vessels based life cycle analysis (LCA) method. It is found that vessel manufacture emits minimum greenhouse gas (GHG) 5539 kgCO2 eq, which lower than of 7219 eq 135 000 in their whole cycle. The shows high-pressure has lowest cost 10.4 US$/...
We present new proper motion measurements of optically emitting oxygen-rich knots supernova remnant 1E 0102.2-7219 (E0102), which are used to estimate the remnant's center expansion and age. Four epochs high resolution Hubble Space Telescope images spanning 19 yr were retrieved analyzed. found a robust alpha=1:04:02.48 delta=-72:01:53.92 (J2000) with 1-sigma uncertainty 1.77 arcseconds using 45...
The quantity and composition of dust produced in core-collapse supernovae is a matter of much debate. Observations of dust around quasars at high redshift have been explained via models invoking efficient dust production, with typical yields of 0.1-1 M⊙ of dust per supernova. Observations of supernovae and their remnants, however, have yet to provide evidence for efficient dust production. Obse...
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