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  • 1
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    Divergent consensuses on Arctic amplification influence on midlatitude severe winter weather (2019)
    In:  EPIC3Nature Climate Change, 10(1), pp. 20-29, ISSN: 1758-678X
    Details
    Publication Date: 2021-01-18
    Description: The Arctic has warmed more than twice as fast as the global average since the late twentieth century, a phenomenon known as Arctic amplification (AA). Recently, there have been considerable advances in understanding the physical contributions to AA, and progress has been made in understanding the mechanisms that link it to midlatitude weather variability. Observational studies overwhelmingly support that AA is contributing to winter continental cooling. Although some model experiments support the observational evidence, most modelling results show little connection between AA and severe midlatitude weather or suggest the export of excess heating from the Arctic to lower latitudes. Divergent conclusions between model and observational studies, and even intramodel studies, continue to obfuscate a clear understanding of how AA is influencing midlatitude weather.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 2
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    Positive-parity rotational band in ^{158} Tb (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-08-11
    Description: Author(s): J. Zhong, H. L. Ma, S. P. Hu, X. G. Wu, H. B. Sun, G. S. Li, C. Y. He, Y. Zheng, C. B. Li, Q. M. Chen, H. W. Li, Y. H. Wu, and P. W. Luo Excited states of the odd-odd nucleus Tb 158 have been studied via the Sm 154 ( Li 7 , 3 n ) Tb 158 reaction at a beam energy of 27 MeV. The new level scheme of Tb 158 involving a positive parity rotational band is established up to excitation energy ∼ 2.3 MeV and spin ∼ 17 ℏ . By comparing with the rotational bands… [Phys. Rev. C 92, 024308] Published Mon Aug 10, 2015
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Characterizing the chemically enriched circumgalactic medium of ~38 000 luminous red galaxies in SDSS DR12 (2015)
    Oxford University Press
    Details
    Publication Date: 2015-11-20
    Description: We report a definitive detection of chemically enriched cool gas around massive quiescent galaxies at z 0.4–0.7. The result is based on a survey of 37 621 luminous red galaxy (LRG)-quasi-stellar object pairs in SDSS DR12 with projected distance d  〈 500 kpc. The LRGs are characterized by a predominantly old stellar population (age 1 Gyr) with 13 per cent displaying [O ii ] emission features and LINER-like spectra. Both passive and [O ii ]-emitting LRGs share the same stellar mass distribution with a mean of 〈log ( M * /M )〉 11.4 and a dispersion of 0.2 dex. Both LRG populations exhibit associated strong Mg ii absorbers out to d  〈 500 kpc. The mean gas covering fraction at d 120 kpc is $\langle \kappa \rangle _{\rm Mg\,\small {II}} 〉 15$  per cent and declines quickly to $\langle \kappa \rangle _{\rm Mg\,\small {II}} \approx 5$  per cent at d 500 kpc. No clear dependence on stellar mass is detected for the observed Mg ii absorption properties. The observed velocity dispersion of Mg ii -absorbing gas relative to either passive or [O ii ]-emitting LRGs is merely 60 per cent of what is expected from virial motion in these massive haloes. While no apparent azimuthal dependence is seen for $\langle \kappa \rangle _{\rm Mg\,\small {II}}$ around passive LRGs at all radii, a modest enhancement in $\langle \kappa \rangle _{\rm Mg\,\small {II}}$ is detected along the major axis of [O ii ]-emitting LRGs at d  〈 50 kpc. The suppressed velocity dispersion of Mg ii -absorbing gas around both passive and [O ii ]-emitting LRGs, together with an elevated $\langle \kappa \rangle _{\rm Mg\,\small {II}}$ along the major axis of [O ii ]-emitting LRGs at d  〈 50 kpc, provides important insights into the origin of the observed chemically enriched cool gas in LRG haloes. We consider different scenarios and conclude that the observed Mg ii absorbers around LRGs are best explained by a combination of cool clouds formed in thermally unstable LRG haloes and satellite accretion through filaments.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 4
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    On the possible environmental effect in distributing heavy elements beyond individual gaseous haloes (2015)
    Oxford University Press
    Details
    Publication Date: 2015-04-10
    Description: We present a study of extended galaxy halo gas through H i and O vi absorption over two decades in projected distance at z   0.2. The study is based on a sample of 95 galaxies from a highly complete (〉80 per cent) survey of faint galaxies ( L  〉 0.1 L * ) with archival quasar absorption spectra and 53 galaxies from the literature. A clear anticorrelation is found between H i (O vi ) column density and virial radius normalized projected distance, d / R h . Strong H i (O vi ) absorption systems with column densities greater than 10 14.0 (10 13.5 ) cm –2 are found for 48 of 54 (36 of 42) galaxies at d 〈 R h indicating a mean covering fraction of $\langle \kappa _{\rm H\,\small {i}}\rangle =0.89$ ( $\langle \kappa _{\rm O\,\small {vi}}\rangle =0.86$ ). O vi absorbers are found at d    R h , beyond the extent observed for lower ionization species. At d / R h  = 1–3 strong H i (O vi ) absorption systems are found for only 7 of 43 (5 of 34) galaxies ( $\langle \kappa _{\rm H\,\small {i}}\rangle =0.16$ and $\langle \kappa _{\rm O\,\small {vi}}\rangle =0.15$ ). Beyond d  = 3 R h , the H i and O vi covering fractions decrease to levels consistent with coincidental systems. The high completeness of the galaxy survey enables an investigation of environmental dependence of extended gas properties. Galaxies with nearby neighbours exhibit a modest increase in O vi covering fraction at d  〉  R h compared to isolated galaxies ( $\kappa _{\rm O\,\small {vi}}\approx 0.13$ versus 0.04) but no excess H i absorption. These findings suggest that environmental effects play a role in distributing heavy elements beyond the enriched gaseous haloes of individual galaxies. Finally, we find that differential H i and O vi absorption between early- and late-type galaxies continues from d  〈  R h to d   3 R h .
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 5
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    Probing the cool interstellar and circumgalactic gas of three massive lensing galaxies at z = 0.4-0.7 (2016)
    Oxford University Press
    Details
    Publication Date: 2016-03-24
    Description: We present multisightline absorption spectroscopy of cool gas around three lensing galaxies at z  = 0.4–0.7. These lenses have half-light radii r e  = 2.6–8 kpc and stellar masses of log M * /M = 10.9–11.4, and therefore resemble nearby passive elliptical galaxies. The lensed QSO sightlines presented here occur at projected distances of d  = 3–15 kpc (or d 1–2 r e ) from the lensing galaxies, providing for the first time an opportunity to probe both interstellar gas at r  ~  r e and circumgalactic gas at larger radii r  〉〉  r e of these distant quiescent galaxies. We observe distinct gas absorption properties among different lenses and among sightlines of individual lenses. Specifically, while the quadruple lens for HE 0435–1223 shows no absorption features to very sensitive limits along all four sightlines, strong Mg ii , Fe  ii , Mg  i , and Ca  ii absorption transitions are detected along both sightlines near the double lens for HE 0047–1756, and in one of the two sightlines near the double lens for HE 1104–1805. The absorbers are resolved into 8–15 individual components with a line-of-sight velocity spread of v 300–600 km s –1 . The large ionic column densities, log N 14, observed in two components suggest that these may be Lyman limit or damped Ly α absorbers with a significant neutral hydrogen fraction. The majority of the absorbing components exhibit a uniform supersolar Fe/Mg ratio with a scatter of 〈0.1 dex across the full v range. Given a predominantly old stellar population in these lensing galaxies, we argue that the observed large velocity width and Fe-rich abundance pattern can be explained by SNe Ia enriched gas at radius r  ~  r e . We show that additional spatial constraints in line-of-sight velocity and relative abundance ratios afforded by a multisightline approach provide a powerful tool to resolve the origin of chemically enriched cool gas in massive haloes.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 6
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    Inverse spin Hall effect in Pt/(Ga,Mn)As (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-06-04
    Description: We investigate dc voltages under ferromagnetic resonance in a Pt/(Ga,Mn)As bilayer structure. A part of the observed dc voltage is shown to originate from the inverse spin Hall effect. The sign of the inverse spin Hall voltage is the same as that in Py/Pt bilayer structure, even though the stacking order of ferromagnetic and nonmagnetic layers is opposite to each other. The spin mixing conductance at the Pt/(Ga,Mn)As interface is determined to be of the order of 10 19  m −2 , which is about ten times greater than that of (Ga,Mn)As/p-GaAs.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 7
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    MITF enhances Wnt signaling through endolysosomes [Cell Biology] (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-02-04
    Description: Canonical Wnt signaling plays an important role in development and disease, regulating transcription of target genes and stabilizing many proteins phosphorylated by glycogen synthase kinase 3 (GSK3). We observed that the MiT family of transcription factors, which includes the melanoma oncogene MITF (micropthalmia-associated transcription factor) and the lysosomal master regulator...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 8
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    Electrochemical research on corrosion behavior of A3 steel in compound sodium molybadate and organic inhibitor solution (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-07-17
    Description: The electrochemical corrosion behavior of A3 in compound sodium molybdate and organic inhibitor solution was tested by the electrochemical workstation method. The concentration of the compound inhibitor set to range 250 mg/L to 3000 mg/L. The polarization curve results of A3 in different concentration inhibitor solutions show that the inhibitor markedly represses the anodic processes. The EIS has two time constant. The extreme concentration is 1500 mg/L.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 9
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    Protein markers to detect early-stage oral cancer [Medical Sciences] (2016)
    National Academy of Sciences
    Details
    Publication Date: 2016-10-12
    Description: Most cases of oral squamous cell carcinoma (OSCC) develop from visible oral potentially malignant disorders (OPMDs). The latter exhibit heterogeneous subtypes with different transformation potentials, complicating the early detection of OSCC during routine visual oral cancer screenings. To develop clinically applicable biomarkers, we collected saliva samples from 96 healthy controls,...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    On the origin of excess cool gas in quasar host haloes (2015)
    Oxford University Press
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    Publication Date: 2015-07-26
    Description: Previous observations of quasar host haloes at z   2 have uncovered large quantities of cool gas that exceed what is found around inactive galaxies of both lower and higher masses. To better understand the source of this excess cool gas, we compiled an exhaustive sample of 195 quasars at z   1 with constraints on chemically enriched, cool gas traced by Mg ii absorption in background quasar spectra from the Sloan Digital Sky Survey. This quasar sample spans a broad range of luminosities from L bol  = 10 44.4 to 10 46.8 erg s –1 and allows an investigation of whether halo gas properties are connected with quasar properties. We find a strong correlation between luminosity and cool gas covering fraction. In particular, low-luminosity quasars exhibit a mean gas covering fraction comparable to inactive galaxies of similar masses, but more luminous quasars exhibit excess cool gas approaching what is reported previously at z   2. Moreover, 30–40 per cent of the Mg ii absorption occurs at radial velocities of | v | 〉 300 km s –1  from the quasar, inconsistent with gas bound to a typical quasar host halo. The large velocity offsets and observed luminosity dependence of the cool gas near quasars can be explained if the gas arises from: (1) neighbouring haloes correlated through large-scale structure at Mpc scales, (2) feedback from luminous quasars or (3) debris from the mergers thought to trigger luminous quasars. The first of these scenarios is in tension with the lack of correlation between quasar luminosity and clustering while the latter two make distinct predictions that can be tested with additional observations.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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