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- 저자 : Mauron, Philippe (검색결과 2 건)
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<i>HST</i> IMAGES REVEAL DRAMATIC CHANGES IN THE CORE OF IRC+10216
Kim, Hyosun,Lee, Ho-Gyu,Mauron, Nicolas,Chu, You-Hua IOP Publishing 2015 ASTROPHYSICAL JOURNAL LETTERS - Vol.804 No.1
<P>IRC+10216 is the nearest carbon star with a very high mass-loss rate. The existence of a binary companion has been hinted at by indirect observational evidence, such as the bipolar morphology of its nebula and a spiral-like pattern in its circumstellar material; however, to date, no companion has been identified. We have examined archival Hubble Space Telescope images of IRC+10216, and find that the images taken in 2011 exhibit dramatic changes in its innermost region from those taken at earlier epochs. The scattered light is more spread out in 2011. After proper motion correction, the brightest peak in 2011 is close to, but not coincident with, the dominant peak in previous epochs. A fainter point-like object was revealed at similar to 0 ''.5 from this brightest peak. We suggest that these changes at the core of IRC+10216 are caused by dissipation of intervening circumstellar dust, as indicated by the brightening trend in the light curve extracted from the Catalina photometric survey. We tentatively identify the brightest peak in 2011 as the primary star of IRC+10216 and the fainter point-like source as a companion. The cause of non-detections of the companion candidate in earlier epochs is uncertain. These identifications need to be verified by monitoring the core of IRC+10216 at high resolution in the future.</P>
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Pressure and temperature dependence of the decomposition pathway of LiBH<sub>4</sub>
Yan, Yigang,Remhof, Arndt,Hwang, Son-Jong,Li, Hai-Wen,Mauron, Philippe,Orimo, Shin-ichi,Zü,ttel, Andreas The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.18
<P>The decomposition pathway is crucial for the applicability of LiBH<SUB>4</SUB> as a hydrogen storage material. We discuss and compare the different decomposition pathways of LiBH<SUB>4</SUB> according to the thermodynamic parameters and show the experimental ways to realize them. Two pathways, <I>i.e.</I> the direct decomposition into boron and the decomposition <I>via</I> Li<SUB>2</SUB>B<SUB>12</SUB>H<SUB>12</SUB>, were realized under appropriate conditions, respectively. By applying a H<SUB>2</SUB> pressure of 50 bar at 873 K or 10 bar at 700 K, LiBH<SUB>4</SUB> is forced to decompose into Li<SUB>2</SUB>B<SUB>12</SUB>H<SUB>12</SUB>. In a lower pressure range of 0.1 to 10 bar at 873 K and 800 K, the concurrence of both decomposition pathways is observed. Raman spectroscopy and <SUP>11</SUP>B MAS NMR measurements confirm the formation of an intermediate Li<SUB>2</SUB>B<SUB>12</SUB>H<SUB>12</SUB> phase (mostly Li<SUB>2</SUB>B<SUB>12</SUB>H<SUB>12</SUB> adducts, such as dimers or trimers) and amorphous boron.</P> <P>Graphic Abstract</P><P>The thermodynamic properties of LiBH<SUB>4</SUB> and its possible decomposition products and intermediates allow flexibility in selection of the decomposition pathway by tuning the external parameters such as pressure and temperature. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp40131b'> </P>
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