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  • 1
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    α (2015)
    American Physical Society (APS)
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    Publication Date: 2015-05-30
    Description: Author(s): L. Ma (马龙), Z. Y. Zhang (张志远), Z. G. Gan (甘再国), H. B. Yang (杨华彬), L. Yu (郁琳), J. Jiang (姜舰), J. G. Wang (王建国), Y. L. Tian (田玉林), Y. S. Wang (王永生), S. Guo (郭松), B. Ding (丁兵), Z. Z. Ren (任中洲), S. G. Zhou (周善贵), X. H. Zhou (周小红), H. S. Xu (徐瑚珊), and G. Q. Xiao (肖国青) The new neutron-deficient isotope U 216 was produced in the complete-fusion reaction W 180 ( Ar 40 , 4 n ) U 216 . The evaporation residues were separated from the primary beam in flight by the gas-filled recoil separator Spectrometer for Heavy Atoms and Nuclear Structure. The activities have been identified by... [Phys. Rev. C 91, 051302(R)] Published Thu May 28, 2015
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Scaling behavior of temperature-dependent thermopower in CeAu_{2} Si_{2} under pressure (2016)
    American Physical Society (APS)
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    Publication Date: 2016-07-29
    Description: Author(s): Z. Ren, G. W. Scheerer, G. Lapertot, and D. Jaccard We report a combined study of in-plane resistivity and thermopower of the pressure-induced heavy-fermion superconductor CeAu 2 Si 2 up to 27.8 GPa. It is found that thermopower follows a scaling behavior in T / T * almost up to the magnetic critical pressure p c ∼ 22 GPa. By comparing with resistivity result… [Phys. Rev. B 94, 024522] Published Thu Jul 28, 2016
    Keywords: Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Enlarged Mn 3s splitting and room-temperature ferromagnetism in epitaxially grown oxygen doped Mn2N0.86 films (2014)
    American Institute of Physics (AIP)
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    Publication Date: 2014-11-07
    Description: Single-phase and oxygen doped Mn 2 N 0.86 thin films have been grown on MgO (111) by plasma-assisted molecular beam epitaxy. The films grow under tensile strain and, remarkably, they show ferromagnetic-like interactions at low temperature and ferromagnetic ordering agreed well with the Bloch-law T 3 / 2 at room-temperature. We further demonstrate the enlarged Mn 3s splitting (6.46 eV) and its possible relation to the observed ferromagnetism. Our study not only provide a strategy for further theoretical work on oxygen doped manganese nitrides, but also shed promising light on utilizing its room-temperature FM property to fabricate spintronic devices.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    Generation of multicomponent atomic Schrödinger cat states of up to 20 qubits (2019)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2019
    Description: 〈p〉Multipartite entangled states are crucial for numerous applications in quantum information science. However, the generation and verification of multipartite entanglement on fully controllable and scalable quantum platforms remains an outstanding challenge. We report the deterministic generation of an 18-qubit Greenberger-Horne-Zeilinger (GHZ) state and multicomponent atomic Schrödinger cat states of up to 20 qubits on a quantum processor, which features 20 superconducting qubits, also referred to as artificial atoms, interconnected by a bus resonator. By engineering a one-axis twisting Hamiltonian, the system of qubits, once initialized, coherently evolves to multicomponent atomic Schrödinger cat states—that is, superpositions of atomic coherent states including the GHZ state—at specific time intervals as expected. Our approach on a solid-state platform should not only stimulate interest in exploring the fundamental physics of quantum many-body systems, but also enable the development of applications in practical quantum metrology and quantum information processing.〈/p〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    A statistical approach to quantify atmospheric contributions to the ITEC WN4 structure over low latitudes (2019)
    Wiley
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    Publication Date: 2019
    Description: Abstract Based on multi‐year observations of ionospheric total electron content (TEC) and atmospheric wind, we develop a new method to interpret the atmospheric contribution to the ionospheric wavenumber‐4 (WN4) structure according to their coherences in annual variations. Firstly, the ionospheric WN4 is extracted from the equatorial integrated TEC (ITEC) using the global ionospheric maps (GIMs). The TIDI/TIMED wind observations were used to deduce the latitudinal symmetric and antisymmetric components of the zonal and meridional DE3 (diurnal, eastward, zonal wavenumber 3), SE2 (semidiurnal, eastward, zonal wavenumber 2) and SPW4 (stationary planetary wave with zonal wavenumber 4). We then develop a regression model to estimate the coupling efficiency, the background diurnal influence and the associated contribution in ITEC WN4. (1) The zonal symmetric DE3 is the most efficient tide in generating ITEC WN4, while the zonal symmetric SPW4 plays a secondary but varied role. (2) The diurnal variation of background ionosphere/thermosphere influence's amplitude is similar to that of the zonal mean ITEC during the day, with a westward phase velocity. (3) The zonal symmetric DE3 resulted WN4 can reach 7% of the zonal daily mean ITEC while the observed total WN4 value is about 10%. The contributions by the zonal symmetric SE2, SPW4 and meridional symmetric SE2 are comparable with respective maxima ~1.5% of the zonal daily mean ITEC. The present results confirm former suggestions that symmetric zonal DE3 is the primary source for ionospheric WN4, and the contributions due to antisymmetric wind components are relatively small in ITEC WN4.
    Print ISSN: 2169-9380
    Electronic ISSN: 2169-9402
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 6
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    Anomalous Hall effect in epitaxial ferrimagnetic anti-perovskite Mn4−xDyxN films (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-08-06
    Description: Anomalous Hall effect (AHE) has been studied for ferrimagnetic antiperovskite Mn 4−x Dy x N films grown by molecular-beam epitaxy. The introduction of Dy changes the AHE dramatically, even changes its sign, while the variations in magnetization are negligible. Two sign reversals of the AHE (negative-positive-negative) are ascribed to the variation of charge carriers as a result of Fermi surface reconstruction. We further demonstrate that the AHE current J AH is dissipationless (independent of the scattering rate), by confirming that anomalous Hall conductivity, σ AH , is proportional to the carrier density n at 5 K. Our study may provide a route to further utilize antiperovskite manganese nitrides in spintronics.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 7
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    Extrinsic anomalous Hall effect in epitaxial Mn4N films (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-01-22
    Description: Anomalous Hall effect (AHE) in ferrimagnetic Mn 4 N epitaxial films grown by molecular-beam epitaxy is investigated. The longitudinal conductivity σ x x is within the superclean regime, indicating Mn 4 N is a highly conducting material. We further demonstrate that the AHE signal in 40-nm-thick films is mainly due to the extrinsic contributions based on the analysis fitted by ρ A H = a ′ ρ x x 0 + b ρ x x 2 and σ A H ∝ σ x x . Our study not only provide a strategy for further theoretical work on antiperovskite manganese nitrides but also shed promising light on utilizing their extrinsic AHE to fabricate spintronic devices.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 8
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    Patterns of Evolutionary Conservation of Ascorbic Acid-Related Genes Following Whole-Genome Triplication in Brassica rapa (2015)
    Oxford University Press
    Details
    Publication Date: 2015-01-31
    Description: Ascorbic acid (AsA) is an important antioxidant in plants and an essential vitamin for humans. Extending the study of AsA-related genes from Arabidopsis thaliana to Brassica rapa could shed light on the evolution of AsA in plants and inform crop breeding. In this study, we conducted whole-genome annotation, molecular-evolution and gene-expression analyses of all known AsA-related genes in B. rapa . The nucleobase–ascorbate transporter (NAT) gene family and AsA l -galactose pathway genes were also compared among plant species. Four important insights gained are that: 1) 102 AsA-related gene were identified in B. rapa and they mainly diverged 12–18 Ma accompanied by the Brassica -specific genome triplication event; 2) during their evolution, these AsA-related genes were preferentially retained, consistent with the gene dosage hypothesis; 3) the putative proteins were highly conserved, but their expression patterns varied; and 4) although the number of AsA-related genes is higher in B. rapa than in A. thaliana , the AsA contents and the numbers of expressed genes in leaves of both species are similar, the genes that are not generally expressed may serve as substitutes during emergencies. In summary, this study provides genome-wide insights into evolutionary history and mechanisms of AsA-related genes following whole-genome triplication in B. rapa .
    Electronic ISSN: 1759-6653
    Topics: Biology
    Published by Oxford University Press
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  • 9
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    Suitable parameter choice on quantitative morphology of A549 cell in epithelial - mesenchymal transition (2015)
    Portland Press
    Details
    Publication Date: 2015-04-23
    Description: Evaluation of morphological changes in cells is an integral part of study on epithelial to messenchymal transition (EMT), however, only a few papers reported the changes in quantitative parameters and no an article compared different parameters for demanding better parameters. In the study, the purpose was to investigate suitable parameters for quantitative evaluation of EMT morphological changes. A549 human lung adenocarcinoma cell line was selected for the study. Some cells were stimulated by TGF-beta 1 for EMT, and other cells were as control without TGF-beta 1 stimulation. Subsequently, cells were placed in phase contrast microscope and three arbitrary fields (100×) were captured and saved with a personal computer. Using the tools of Photoshop software, some cells in an image were selected, segmented out and exchanged into unique hue, and other part in the image was shifted into another unique hue. The cells were calculated with 29 morphological parameters by Image Pro Plus software. A parameter between cells with or without TGF-beta1 stimulation was compared statistically and nine parameters were significantly different between them (P〈0.05-0.01). Receiver operating characteristic curve (ROC curve) of a parameter was described with SPSS software and F-test was used to compare two Areas under the curves (AUCs) in Excel. Among them, roundness and radius ratio were the most AUCs and were significant higher than the other parameters (P〈0.05-0.01). The results provided a new method with quantitative assessment of cell morphology during EMT, and found out two parameters, roundness and radius ratio, as suitable for quantification.
    Print ISSN: 0144-8463
    Electronic ISSN: 1573-4935
    Topics: Biology , Chemistry and Pharmacology
    Published by Portland Press
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  • 10
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    Can a nightside geomagnetic delta-H observed at equator manifest a penetration electric field? (2013)
    Wiley
    Details
    Publication Date: 2013-02-13
    Description: [1]   ABSTRACT . The prompt penetration electric field (PPEF) usually manifests itself in the form of an equatorial ionospheric electric field being in correlation with the solar wind electric field. Due to the strong Cowling conductivity, PPEF on the dayside can be inferred from “ Δ H”, which is the difference in the magnitudes of the Horizontal (H) component between a magnetometer at the magnetic equator and one off the equator. This paper aims to investigate the performance of Δ H in response to PPEF on the nightside, where the Cowling conductivity is not significant. We first examine the strongest geomagnetically active time during Nov. 20, 2003 superstorm when the Dst drops to -473 nT, and find that the nightside Δ H can indeed manifest PPEF but with local-time and longitude dependences. We then examine a moderate active time by taking advantage of the multiple penetration event during Nov. 11-16, 2003 when the Dst remains larger than -60 nT. During this event, a series of PPEF pulses recorded at Peru, Japan and India forms a database allowing us to examine PPEF effects at different local times and longitudes. The results show: (1) the nightside Δ H was caused by attenuation of the effects of polar electric field with decreasing latitude; (2) the nightside Δ H can manifest PPEF at least in the midnight-dawn sector (0000 - 0500 LT), but not always; (3) on average, the magnitude of nightside Δ H in the midnight-dawn sector at Peru is only 1/18 of that on the dayside in response to a given PPEF.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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