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Ergodic SDEs on submanifolds and related numerical sampling schemes
作者：Wei Zhang
来源：[J].ESAIM: Mathematical Modelling and Numerical Analysis(IF 1.031), 2020, Vol.54 (2), pp.391-430EDP Sciences
摘要：In many applications, it is often necessary to sample the mean value of certain quantity with respect to a probability measure μ on the level set of a smooth function ξ : ℝ d → ℝ k , 1 ≤ k < d . A specially interesting case is the so-called conditional probability ...
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    A minimum entropy principle in the compressible multicomponent Euler equations
    作者：Ayoub Gouasmi , Karthik Duraisamy , Scott M. Murman ...
    来源：[J].ESAIM: Mathematical Modelling and Numerical Analysis(IF 1.031), 2020, Vol.54 (2), pp.373-389EDP Sciences
    摘要：In this work, the space of admissible entropy functions for the compressible multicomponent Euler equations is explored, following up on Harten ( J. Comput. Phys. 49 (1983) 151–164). This effort allows us to prove a minimum entropy principle on entropy solutions, whether smo...
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      A new methodology to create valid time-dependent correlation matrices via isospectral flows
      作者：Long Teng , Xueran Wu , Michael Günther ...
      来源：[J].ESAIM: Mathematical Modelling and Numerical Analysis(IF 1.031), 2020, Vol.54 (2), pp.361-371EDP Sciences
      摘要：In many areas of finance and of risk management it is interesting to know how to specify time-dependent correlation matrices. In this work we propose a new methodology to create valid time-dependent instantaneous correlation matrices, which we called correlation flows. In our met...
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        Present-day mass-metallicity relation for galaxies using a new electron temperature method
        作者：R. M. Yates , P. Schady , T.-W. Chen ...
        来源：[J].Astronomy & Astrophysics(IF 5.084), 2020, Vol.634EDP Sciences
        摘要：Aims. We investigate electron temperature ( T e) and gas-phase oxygen abundance ( Z Te) measurements for galaxies in the local Universe ( z < 0.25). Our sample comprises spectra from a total of 264 emission-line systems, ranging from individual H II reg...
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          Hot WHIM counterparts of FUV O VI absorbers: Evidence in the line-of-sight towards quasar 3C 273
          作者：Jussi Ahoranta , Jukka Nevalainen , Nastasha Wijers ...
          来源：[J].Astronomy & Astrophysics(IF 5.084), 2020, Vol.634EDP Sciences
          摘要：Aims. We explore the high spectral resolution X-ray data towards the quasar 3C 273 to search for signals of hot (∼106−7 K) X-ray-absorbing gas co-located with two established intergalactic far-ultraviolet (FUV) O VI absorbers. Methods. We analyze the soft X-ray band grating ...
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            LOFAR view of NGC 3998, a sputtering AGN
            作者：Sarrvesh S. Sridhar , Raffaella Morganti , Kristina Nyland ...
            来源：[J].Astronomy & Astrophysics(IF 5.084), 2020, Vol.634EDP Sciences
            摘要：Low-power radio sources dominate the radio sky. They tend to be small in size and dominated by their cores, but the origin of their properties and the evolution of their radio plasma are not well constrained. Interestingly, there is mounting evidence that low-power radio sou...
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              A dispersion excess from pulsar wind nebulae and supernova remnants: Implications for pulsars and FRBs
              作者：S. M. Straal , L. Connor , J. van Leeuwen
              来源：[J].Astronomy & Astrophysics(IF 5.084), 2020, Vol.634EDP Sciences
              摘要：Young pulsars and the pulsar wind nebulae (PWNe) or supernova remnants (SNRs) that surround them are some of the most dynamic and high-powered environments in our Universe. With the rise of more sensitive observations, the number of pulsar-SNR and PWN associations (hereafter...
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                A global climatological model of extreme geomagnetic field fluctuations
                作者：Neil C. Rogers , James A. Wild , Emma F. Eastoe ...
                来源：[J].Journal of Space Weather and Space Climate, 2020, Vol.10EDP Sciences
                摘要：This paper presents a multi-parameter global statistical model of extreme horizontal geomagnetic field fluctuations (d BH /d t ), which are a useful input to models assessing the risk of geomagnetically induced currents in ground infrastructure. Generalised Pareto...
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                  Defect formation during dissimilar aluminium friction stir welded T-joints
                  作者：Mubeen Ali , Saquib Anjum , Arshad Noor Siddiquee ...
                  来源：[J].Mechanics & Industry(IF 0.127), 2020, Vol.21 (2)EDP Sciences
                  摘要：AA8011 remains one of the largest used aluminium alloys due to excellent ductility, corrosion resistance and sufficient strength in H14 conditions. The 5754, due to high strength and corrosion resistance finds key applications in marine, process industry, automobile and nuclear a...
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                    Phase transitions in nematics: textures with tactoids and disclinations
                    作者：Dmitry Golovaty , Young-Ki Kim , Oleg D. Lavrentovich ...
                    来源：[J].Mathematical Modelling of Natural Phenomena(IF 0.558), 2020, Vol.15EDP Sciences
                    摘要：We demonstrate that a first order isotropic-to-nematic phase transition in liquid crystals can be succesfully modeled within the generalized Landau-de Gennes theory by selecting an appropriate combination of elastic constants. The numerical simulations of the model established in...
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