26,283 research outputs found

    A Survey on Multisensor Fusion and Consensus Filtering for Sensor Networks

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    Multisensor fusion and consensus filtering are two fascinating subjects in the research of sensor networks. In this survey, we will cover both classic results and recent advances developed in these two topics. First, we recall some important results in the development ofmultisensor fusion technology. Particularly, we pay great attention to the fusion with unknown correlations, which ubiquitously exist in most of distributed filtering problems. Next, we give a systematic review on several widely used consensus filtering approaches. Furthermore, some latest progress on multisensor fusion and consensus filtering is also presented. Finally, conclusions are drawn and several potential future research directions are outlined.the Royal Society of the UK, the National Natural Science Foundation of China under Grants 61329301, 61374039, 61304010, 11301118, and 61573246, the Hujiang Foundation of China under Grants C14002 and D15009, the Alexander von Humboldt Foundation of Germany, and the Innovation Fund Project for Graduate Student of Shanghai under Grant JWCXSL140

    Pb(II) and Mn(II) Supermolecular Polymers of Bipy and (4-Chlorophenyloxy) Acetate Anions: Syntheses, Structure and Fluorescence Properties

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    Two new supermolecular polymers of the formula [Pb4L8(2,2’-bipy)4] 1 and [MnL2(4,4’-bipy)] 2 [HL = (4-chlorophenyloxy)acetic acid] have been synthesized and characterized by X-ray single crystal diffraction analysis, elemental analysis, fluorescence spectroscopy method and electrochemical analysis. Complex 1 is a multinuclear dimmer in which four Pb ions are linked together by the L ligands. In complex 2, each carboxyl of L bridges two Mn ions to form infinite Mn–O–C-Orods. Both in complex 1 and complex 2, π–π stacking and van der Waals’ interactions make the two complexes stable, 3-D, supermolecular polymers. This work will contribute to the design and synthesis of fluorescent, supramolecular polymers.Keywords: Supermolecular polymers, fluorescence, 4-chlorophenyloxyacetic aci

    Electronic structure of heavily electron-doped BaFe1.7_{1.7}Co0.3_{0.3}As2_2 studied by angle-resolved photoemission

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    We have performed high-resolution angle-resolved photoemission spectroscopy on heavily electron-doped non-superconducting (SC) BaFe1.7_{1.7}Co0.3_{0.3}As2_2. We find that the two hole Fermi surface pockets at the zone center observed in the hole-doped superconducting Ba0.6_{0.6}K0.4_{0.4}Fe2_2As2_2 are absent or very small in this compound, while the two electron pockets at the M point significantly expand due to electron doping by the Co substitution. Comparison of the Fermi surface between non-SC and SC samples indicates that the coexistence of hole and electron pockets connected via the antiferromagnetic wave vector is essential in realizing the mechanism of superconductivity in the iron-based superconductors.Comment: 5 pages, 4 figure

    Local breaking of four-fold rotational symmetry by short-range magnetic order in heavily overdoped Ba(Fe1−x_{1-x}Cux_{x})2_{2}As2_{2}

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    We investigate Cu-doped Ba(Fe1−x_{1-x}Cux_x)2_2As2_2 with transport, magnetic susceptibility, and elastic neutron scattering measurements. In the heavily Cu-doped regime where long-range stripe-type antiferromagnetic order in BaFe2_2As2_2 is suppressed, Ba(Fe1−x_{1-x}Cux_x)2_2As2_2 (0.145 ≤x≤\leq x \leq 0.553) samples exhibit spin-glass-like behavior in magnetic susceptibility and insulating-like temperature dependence in electrical transport. Using elastic neutron scattering, we find stripe-type short-range magnetic order in the spin-glass region identified by susceptibility measurements. The persistence of short-range magnetic order over a large doping range in Ba(Fe1−x_{1-x}Cux_x)2_2As2_2 likely arises from local arrangements of Fe and Cu that favor magnetic order, with Cu acting as vacancies relieving magnetic frustration and degeneracy. These results indicate locally broken four-fold rotational symmetry, suggesting that stripe-type magnetism is ubiquitous in iron pnictides.Comment: accepted by Physical Review B Rapid Communication
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