50 research outputs found

    Chromospheric Activity of HAT-P-11: an Unusually Active Planet-Hosting K Star

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    Kepler photometry of the hot Neptune host star HAT-P-11 suggests that its spot latitude distribution is comparable to the Sun's near solar maximum. We search for evidence of an activity cycle in the CaII H & K chromospheric emission SS-index with archival Keck/HIRES spectra and observations from the echelle spectrograph on the ARC 3.5 m Telescope at APO. The chromospheric emission of HAT-P-11 is consistent with a 10\gtrsim 10 year activity cycle, which plateaued near maximum during the Kepler mission. In the cycle that we observed, the star seemed to spend more time near active maximum than minimum. We compare the logRHK\log R^\prime_{HK} normalized chromospheric emission index of HAT-P-11 with other stars. HAT-P-11 has unusually strong chromospheric emission compared to planet-hosting stars of similar effective temperature and rotation period, perhaps due to tides raised by its planet.Comment: 16 pages, 8 figures; accepted to the Astrophysical Journa

    Social Structure of the Chinese Academic Labor Market in a Changing Environment

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    The Chinese economy and labor market are under fundamental change, with its transitional economy and the globalization of labor market interacting each other and reshaping the institutional environment and structure of the Chinese academia. This research utilized a mixed method study to address the effect of China social relations and guanxi. It investigated the network configuration which assisted the domestic trained Chinese scholars and the overseas educated returnees in developing the optimal career trajectories. The finding of the research showed that the cohesive and strong network of domestic scholars showed higher odds of being promoted, while large and open networks are more conducive to overseas returnees in exploiting their international collaboration, but such effect diminished at the later and more advanced promotion for overseas returnees. To promote the sense of belonging, overseas returned Ph.D. are necessary to construct cohesive and strong relationship, which coincide with the meaning of guanxi network in order to better survive in the Chinese academia and society once they rooted back in China. The research also found out that with more developed market in China, guanxi is still productive in bridging hiring universities and individual scholars with trust flowing through the social relations among them. It is not only the structure of the labor market induces individuals to use social network and relations for job promotions, but the social relations themselves are also part of the fundamental structure and institution of the labor market where the market dynamics are embedded in

    Flow chart of reports selection.

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    <p>This figure shows the process of the selection. The researchers applied the search method to find 359 reports related to the topic. One researcher (XL) picked out 19 duplications of these reports by the software NoteExpress and 169 reports of animals experiments, 5 cases and 36 reports of the wrong intervention by scanning the title and abstract of the citation retrieved by the selection search engine (first scanning). Another researcher (WJY) then viewed the full text of all potentially eligible reports obtained and picked out 73 reviews and theory analyses, one suspicious duplicate and 42 reports of the wrong intervention. At last, 14 reports are included for final analysis.</p

    Number of reports published in the recent five years.

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    <p>According to the <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0016922#pone-0016922-t001" target="_blank">Table 1</a>, the years of publication of included reports is mainly during these five years, namely from the 2006 to 2010. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0016922#pone-0016922-g002" target="_blank">Figure 2</a> shows one report is published in 2006, two in 2007, four in 2008, six in 2009, and one in 2010.</p

    Understanding the Nanostructure Formation of the Templated Two-Phase Film Growth via Hybrid Modeling

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    A hybrid model incorporating two methods, i.e., the Potts model Monte Carlo and the level set method, is developed to simulate the templated growth of a two-phase CoPt/SiO<sub>2</sub> thin film. Previously it was demonstrated experimentally that the film grown on the prefabricated template followed the pattern of the template, forming a highly ordered microstructure. The simulation in this study investigates the physical mechanism by which such film growth behavior occurs and which parameters dictate the resultant microstructure. To correctly represent the physical process, the interfacial energies between different phases and the rate of each microevent to occur were established through the simulated film deposition on a flat substrate and subsequent comparison to the experimental observations. With the established interfacial energy and rate of microevents, the resultant film microstructure grown on the templated substrate is found to strongly depend on the geometries of domes fabricated on the template. The dominant mechanism of the formation of the microstructure is shown to shift from the surface energy gradient controlled lateral diffusion in the initial stage of film growth, which formed the rudiment of the ordered microstructure, to an interfacial energy controlled process, which retained the ordered microstructure in the later stage

    Cardiac parameters of tachycardia and volume-overload models over the four weeks duration.

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    <p>A: left ventricular end diastolic volume (LVEDV); B: ejection fraction (EF); C: cardiac output (CO); D: left ventricular systolic factor (LVSF). Sham, sham group; Tachy, tachycardia group; VOL, volume-overload group. #: p<0.05, One-way ANOVA analysis with post-hoc (Bonferroni) tests to verify the variation of cardiac parameters in time course.</p
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