439,548 research outputs found

    Centralized systemic risk control in the interbank system : weak formulation and Gamma-convergence

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    202208 bcchOthersHong Kong Polytechnic University research grant under no. P0031417Published24 month

    Arrhenius constitutive model of FV520B steel

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    To investigate the thermoplastic deformation behavior of FV520B steel, the Gleeble-3800 thermal simulation test machine is used to perform hot compression test on FV520B steel. Select a deformation temperature of 900 °C - 1 050 °C, set the strain rate to 0,005 s-1 - 5 s-1 . The results indicate that the Arrhenius constitutive model of FV520B steel with strain compensation correlation coefficient value is 0,99601, and the average relative error is 3,061 %, realizing the fitting of flow stress and prediction, verified the feasibility of the model

    Hierarchical distributed multi-energy demand response for coordinated operation of building clusters

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    202210 bckwRGCOthersInnovation and Technology Commission of the HKSAR Government; National Natural Science Foundation of China; Hunan Natural Science Foundation of ChinaPublished24 month

    Arrhenius constitutive model of FV520B steel

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    To investigate the thermoplastic deformation behavior of FV520B steel, the Gleeble-3800 thermal simulation test machine is used to perform hot compression test on FV520B steel. Select a deformation temperature of 900 °C - 1 050 °C, set the strain rate to 0,005 s-1 - 5 s-1 . The results indicate that the Arrhenius constitutive model of FV520B steel with strain compensation correlation coefficient value is 0,99601, and the average relative error is 3,061 %, realizing the fitting of flow stress and prediction, verified the feasibility of the model

    Observation of enhanced long-range elliptic anisotropies inside high-multiplicity jets in pp collisions at s\sqrt{s} = 13 TeV

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    International audienceA search for partonic collective effects inside jets produced in proton-proton collisions is performed via correlation measurements of charged constituents using the CMS detector at the CERN LHC. The analysis uses data collected at a center-of-mass energy of s\sqrt{s} = 13 TeV, corresponding to an integrated luminosity of 138 fb−1^{-1}. Jets are reconstructed with the anti-kTk_\mathrm{T} algorithm with a distance parameter of 0.8 and are required to have transverse momentum greater than 550 GeV and pseudorapidity ∣η∣\lvert\eta\rvert<\lt 1.6. Two-particle correlations among the charged constituents within the jets are studied as functions of the particles' azimuthal angle and pseudorapidity separations (Δϕ∗\Delta\phi^* and Δη∗\Delta\eta^*) in a jet coordinate basis, where constituents' η∗\eta^*, ϕ∗\phi^* are defined relative to the direction of the jet. The correlation functions are studied in classes of in-jet charged-particle multiplicity up to NchjN_\text{ch}^\mathrm{j}≈\approx 100. Fourier harmonics are extracted from long-range azimuthal correlation functions to characterize azimuthal anisotropy for âˆŁÎ”Î·âˆ—âˆŁ\lvert\Delta\eta^*\rvert>\gt 2. For low-multiplicity jets, the long-range elliptic anisotropic harmonic, v2∗v^*_2, is observed to decrease with NchjN_\text{ch}^\mathrm{j}. This trend is well described by Monte Carlo event generators. However, a rising trend for v2∗v^*_2 emerges at NchjN_\text{ch}^\mathrm{j}≳\gtrsim 80, hinting at a possible onset of collective behavior, which is not reproduced by the models tested. This observation yields new insights into the dynamics of parton fragmentation processes in the vacuum

    Identified charged-hadron production in pp++Al, 3^3He++Au, and Cu++Au collisions at sNN=200\sqrt{s_{_{NN}}}=200 GeV and in U++U collisions at sNN=193\sqrt{s_{_{NN}}}=193 GeV

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    International audienceThe PHENIX experiment has performed a systematic study of identified charged-hadron (π±\pi^\pm, K±K^\pm, pp, pˉ\bar{p}) production at midrapidity in pp++Al, 3^3He++Au, Cu++Au collisions at sNN=200\sqrt{s_{_{NN}}}=200 GeV and U++U collisions at sNN=193\sqrt{s_{_{NN}}}=193 GeV. Identified charged-hadron invariant transverse-momentum (pTp_T) and transverse-mass (mTm_T) spectra are presented and interpreted in terms of radially expanding thermalized systems. The particle ratios of K/πK/\pi and p/πp/\pi have been measured in different centrality ranges of large (Cu++Au, U++U) and small (pp++Al, 3^3He++Au) collision systems. The values of K/πK/\pi ratios measured in all considered collision systems were found to be consistent with those measured in pp++pp collisions. However the values of p/πp/\pi ratios measured in large collision systems reach the values of ≈0.6\approx0.6, which is ≈2\approx2 times larger than in pp++pp collisions. These results can be qualitatively understood in terms of the baryon enhancement expected from hadronization by recombination. Identified charged-hadron nuclear-modification factors (RABR_{AB}) are also presented. Enhancement of proton RABR_{AB} values over meson RABR_{AB} values was observed in central 3^3He++Au, Cu++Au, and U++U collisions. The proton RABR_{AB} values measured in pp++Al collision system were found to be consistent with RABR_{AB} values of ϕ\phi, π±\pi^\pm, K±K^\pm, and π0\pi^0 mesons, which may indicate that the size of the system produced in pp++Al collisions is too small for recombination to cause a noticeable increase in proton production
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