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  • Wiley  (8)
  • American Physical Society (APS)  (5)
  • The Royal Society
  • 2010-2014  (13)
  • 1
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    Calculation of Dyson orbitals using a symmetry-adapted-cluster configuration-interaction method for electron momentum spectroscopy: N_{2} and H_{2}O (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-06-16
    Description: Author(s): Y. R. Miao, C. G. Ning, and J. K. Deng The symmetry-adapted-cluster (SAC) configuration-interaction (CI) theory was introduced to interpret the non-coplanar symmetric ( e , 2 e ) results. Dyson orbitals derived from the bench-marked SAC CI general-R method were utilized for computing the electron momentum distributions. The corresponding exci... [Phys. Rev. A 83, 062706] Published Wed Jun 15, 2011
    Keywords: Atomic and molecular collisions and interactions
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Enhanced Solid-Phase Photocatalytic Degradation Activity of a Poly(vinyl chloride)-TiO2 Nanocomposite Film with Bismuth Oxyiodide (2011)
    Wiley
    Details
    Publication Date: 2011-04-20
    Description: A new type of photodegradable poly(vinyl chloride)-bismuth oxyiodide/TiO 2 (PVC-BiOI/TiO 2 ) nanocomposite film was prepared by embedding a nano-TiO 2 photocatalyst modified by BiOI into the commercial PVC plastic. The solid-phase photocatalytic degradation behavior of the as-prepared film was investigated in ambient air at room temperature under UV light irradiation, with the aid of UV-Vis spectroscopy, weight loss monitoring, scanning electron microscopy, and FT-IR spectroscopy. Compared to the PVC-TiO 2 nanocomposite film, the PVC-BiOI nanocomposite film and the pure PVC film, the PVC-BiOI/TiO 2 nanocomposite film exhibited a higher photocatalytic degradation activity. The optimal mass ratio of BiOI to TiO 2 was found to be 0.75 %. The weight loss rate of the PVC-BiOI/TiO 2 nanocomposite film reached 30.8 % after 336 h of irradiation, which is 1.5 times higher than that of the PVC-TiO 2 nanocomposite film under identical conditions. The solid-phase photocatalytic degradation mechanism of the nanocomposite films was briefly discussed. A new type of photodegradable PVC-BiOI/TiO 2 nanocomposite film was prepared. In comparison with the PVC-TiO 2 nanocomposite film, the PVC-BiOI nanocomposite film and the pure PVC film, the PVC-BiOI/TiO 2 nanocomposite film exhibited a higher solid-phase photocatalytic degradation activity.
    Print ISSN: 0930-7516
    Electronic ISSN: 1521-4125
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley
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  • 3
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    Ionization-excitation of helium by high-resolution (e,2e) spectroscopy and 4-body distorted-wave calculations (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-10-02
    Description: Author(s): X. L. Chen, A. L. Harris, J. M. Li, T. P. Esposito, J. K. Deng, and C. G. Ning We present experimental and theoretical results for electron-impact-induced ionization and excitation of helium atoms. Using a high-sensitivity and high-resolution (e,2e) spectrometer, we measured the differential cross sections of ionization-excitation of He to the n=1−5 states of He+ at an impact ... [Phys. Rev. A 90, 042701] Published Wed Oct 01, 2014
    Keywords: Atomic and molecular collisions and interactions
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
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  • 4
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    Replication protein A prevents promiscuous annealing between short sequence homologies: Implications for genome integrity (2014)
    Wiley
    In: BioEssays
    Details
    Publication Date: 2014-11-15
    Description: Replication protein A (RPA) is the main eukaryotic single-stranded DNA (ssDNA) binding protein, having essential roles in all DNA metabolic reactions involving ssDNA. RPA binds ssDNA with high affinity, thereby preventing the formation of secondary structures and protecting ssDNA from the action of nucleases, and directly interacts with other DNA processing proteins. Here, we discuss recent results supporting the idea that one function of RPA is to prevent annealing between short repeats that can lead to chromosome rearrangements by microhomology-mediated end joining or the formation of hairpin structures that are substrates for structure-selective nucleases. We suggest that replication fork catastrophe caused by depletion of RPA could result from cleavage of secondary structures by nucleases, and that failure to cleave hairpin structures formed at DNA ends could lead to gene amplification. These studies highlight the important role RPA plays in maintaining genome integrity. RPA binding to the ssDNA tailed intermediates that are formed during the repair of DNA double-strand breaks prevents annealing between short sequence homologies internal to the ends. When RPA is depleted from cells, or when its DNA binding activity is compromised, annealing between short repeats can lead to mutagenic microhomology-mediated end joining (MMEJ) or hairpin-capped ends.
    Print ISSN: 0265-9247
    Electronic ISSN: 1521-1878
    Topics: Biology , Medicine
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  • 5
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    High-resolution electron-momentum spectroscopy of the valence orbitals of the iodine molecule (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-05-25
    Description: Author(s): J. S. Zhu, J. K. Deng, and C. G. Ning The valence orbitals of the iodine molecule (I 2 ) have been studied using the high-resolution electron-momentum spectroscopy at impact energies of 1200 and 600 eV. Experimental momentum distributions of outer valence orbitals were compared with the nonrelativistic, scalar relativistic, and spin-orbit... [Phys. Rev. A 85, 052714] Published Thu May 24, 2012
    Keywords: Atomic and molecular collisions and interactions
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
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  • 6
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    Effects of electron-phonon coupling in the Kondo regime of a two-orbital molecule (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-02-07
    Description: Author(s): G. I. Luiz, E. Vernek, L. Deng, K. Ingersent, and E. V. Anda We study the interplay between strong electron-electron and electron-phonon interactions within a two-orbital molecule coupled to metallic leads, taking into account Holstein-like coupling of a local phonon mode to the molecular charge as well as phonon-mediated interorbital tunneling. By combining ... [Phys. Rev. B 87, 075408] Published Wed Feb 06, 2013
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Stability of Immobilized Candida sp. 99–125 Lipase for Biodiesel Production (2012)
    Wiley
    Details
    Publication Date: 2012-11-03
    Description: The stability of the immobilized lipase from Candida sp. 99–125 during biodiesel production was investigated. The lipase was separately incubated in the presence of various reaction components such as soybean oil, oleic acid methyl ester, n -hexane, water, methanol, and glycerol, or the lipase was stored at 60, 80, 100 and 120 °C. Thereafter the residual lipase activity was determined by methanolysis reaction. The results showed that the lipase was rather stable in the reaction media, except for methanol and glycerol. The stability study performed in a reciprocal shaker indicated that enzyme desorption from the immobilized lipase mainly contributed to the lipase inactivation in the water system. So the methanol and glycerol contents should be controlled more precisely to avoid lipase inactivation, and the immobilization method should be improved with regard to lipase desorption. The stability of immobilized Candida sp. 99–125 lipase was investigated. The lipase shows excellent stability in the biodiesel reaction medium. Methanol and glycerol showed the most negative effects on the lipase stability. Desorption was the main reason leading to lipase inactivation in the water system.
    Print ISSN: 0930-7516
    Electronic ISSN: 1521-4125
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley
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  • 8
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    Thermospheric Damping Response to Sheath-Enhanced Geospace Storms (2013)
    Wiley
    Details
    Publication Date: 2013-01-30
    Description: [1]  We show evidence that solar wind density enhancements and pressure pulses can lead to intense low-energy particle precipitation and an associated, but unexpected, damping of thermospheric density response. Ground-based indices, used as proxies for thermospheric energy deposition, fail to capture these interactions in forecasting algorithms. Superposed epoch comparison of a group of poorly specified neutral density storms suggests an event-chain of: 1) Multi-hour, pre-storm solar wind density enhancement, followed by solar wind dynamic pressure pulses that trigger excess low-energy particle flux to the upper atmosphere; 2) Enhanced production of thermospheric Nitric Oxide (NO) by precipitating particles and storm heating; 3) NO infrared cooling and damping of the thermosphere; 4) Mis-forecast of neutral density. In the control storms these features are absent or muted. We discuss the roles of solar wind pre-conditioning and solar cycle dependency in the problem storms. These problem neutral-density storms reveal an element of “geo-effectiveness” that highlights competition between hydrodynamic aspects of the solar wind and other interplanetary drivers.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 9
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    Diluted ferromagnetic semiconductor Li(Zn,Mn)P with decoupled charge and spin doping (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-08-22
    Description: Author(s): Z. Deng, K. Zhao, B. Gu, W. Han, J. L. Zhu, X. C. Wang, X. Li, Q. Q. Liu, R. C. Yu, T. Goko, B. Frandsen, L. Liu, Jinsong Zhang, Yayu Wang, F. L. Ning, S. Maekawa, Y. J. Uemura, and C. Q. Jin We report the discovery of a diluted magnetic semiconductor, Li(Zn,Mn)P, in which charge and spin are introduced independently via lithium off-stoichiometry and the isovalent substitution of Mn 2+ for Zn 2+ , respectively. Isostructural to (Ga,Mn)As, Li(Zn,Mn)P was found to be a p -type ferromagnetic se... [Phys. Rev. B 88, 081203] Published Wed Aug 21, 2013
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 10
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    A practical scheme of the sigma-point Kalman filter for high-dimensional systems (2013)
    Wiley
    Details
    Publication Date: 2013-12-21
    Description: While applying a sigma-point Kalman filter (SPKF) to a high-dimensional system such as the oceanic general circulation model (OGCM), a major challenge is to reduce its heavy burden of storage memory and costly computation. In this study, we propose a new scheme for SPKF to address these issues. First, a reduced rank SPKF was introduced on the high-dimensional model state space using the truncated single value decomposition (TSVD) method (T-SPKF). Second, the relationship of SVDs between the model state space and a low-dimensional ensemble space is used to construct sigma points on the ensemble space (ET-SPKF). As such, this new scheme greatly reduces the demand of memory storage and computational cost and makes the SPKF method applicable to high-dimensional systems. Two numerical models are used to test and validate the ET-SPKF algorithm. The first model is the 40-variable Lorenz model, which has been a test bed of new assimilation algorithms. The second model is a realistic OGCM for the assimilation of actual observations, including Argo and in-situ observations over the Pacific Ocean. The experiments show that ET-SPKF is computationally feasible for high-dimensional systems and capable of precise analyses. In particular, for realistic oceanic assimilations, the ET-SPKF algorithm can significantly improve oceanic analysis and improve ENSO prediction. A comparison between the ET-SPKF algorithm and EnKF (ensemble Kalman filter) is also tribally conducted using the OGCM and actual observations.
    Electronic ISSN: 1942-2466
    Topics: Geography , Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
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