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- 저자 : D’Aquila, Kenneth (검색결과 2 건)
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X-ray Irradiation Induced Reversible Resistance Change in Pt/TiO<sub>2</sub>/Pt Cells
Chang, Seo Hyoung,Kim, Jungho,Phatak, Charudatta,D’Aquila, Kenneth,Kim, Seong Keun,Kim, Jiyoon,Song, Seul Ji,Hwang, Cheol Seong,Eastman, Jeffrey A.,Freeland, John W.,Hong, Seungbum American Chemical Society 2014 ACS NANO Vol.8 No.2
<P>The interaction between X-rays and matter is an intriguing topic for both fundamental science and possible applications. In particular, synchrotron-based brilliant X-ray beams have been used as a powerful diagnostic tool to unveil nanoscale phenomena in functional materials. However, it has not been widely investigated how functional materials respond to the brilliant X-rays. Here, we report the X-ray-induced reversible resistance change in 40-nm-thick TiO<SUB>2</SUB> films sandwiched by Pt top and bottom electrodes, and propose the physical mechanism behind the emergent phenomenon. Our findings indicate that there exists a photovoltaic-like effect, which modulates the resistance reversibly by a few orders of magnitude, depending on the intensity of impinging X-rays. We found that this effect, combined with the X-ray irradiation induced phase transition confirmed by transmission electron microscopy, triggers a nonvolatile reversible resistance change. Understanding X-ray-controlled reversible resistance changes can provide possibilities to control initial resistance states of functional materials, which could be useful for future information and energy storage devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-2/nn405867p/production/images/medium/nn-2013-05867p_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn405867p'>ACS Electronic Supporting Info</A></P>
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Stratospheric variability contributed to and sustained the recent hiatus in Eurasian winter warming
Garfinkel, Chaim I.,Son, Seok‐,Woo,Song, Kanghyun,Aquila, Valentina,Oman, Luke D. John WileySons, Ltd 2017 Geophysical research letters Vol.44 No.1
<▼1><P><B>Abstract</B></P><P>The recent hiatus in global‐mean surface temperature warming was characterized by a Eurasian winter cooling trend, and the cause(s) for this cooling is unclear. Here we show that the observed hiatus in Eurasian warming was associated with a recent trend toward weakened stratospheric polar vortices. Specifically, by calculating the change in Eurasian surface air temperature associated with a given vortex weakening, we demonstrate that the recent trend toward weakened polar vortices reduced the anticipated Eurasian warming due to increasing greenhouse gas concentrations. Those model integrations whose stratospheric vortex evolution most closely matches that in reanalysis data also simulate a hiatus. While it is unclear whether the recent weakening of the midwinter stratospheric polar vortex was forced, a properly configured model can simulate substantial deviations of the polar vortex on decadal timescales and hence such hiatus events, implying that similar hiatus events may recur even as greenhouse gas concentrations rise.</P></▼1><▼2><P><B>Key Points</B></P><P><P>Recent Eurasian cooling was associated with stratospheric variability</P><P>Those model integrations whose stratospheric vortex evolution most closely matches that in reanalysis data also simulate a hiatus</P><P>Similar hiatus events could recur even as GHG concentrations rise, but are only properly simulated by stratosphere‐resolving models</P></P></▼2>
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