A method based on modal strain energy is presented for locating damage in a structure. This method makes use of the change of modal strain energy in each structural element before and after the ...occurrence of damage. Some properties of this Modal Strain Energy Change are given to illustrate its sensitivity in locating the structural damage. Information required in the identification are the measured mode shapes and elemental stiffness matrix only without knowledge of the complete stiffness and mass matrices of the structure. Several damage cases in a simulated structure are studied in which the effect of random error in terms of measurement noise in the mode shapes and systematic error in terms of errors from incomplete measurements are considered. This method is then applied to detect damage in a single-bay two-storey portal steel frame structure. Results illustrate that the MSEC is sensitive to damage, and the proposed method is simple and robust in locating single or multiple damages in a structure.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Using 2.93 fb–1 of e+e– collision data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, the first observation of the doubly Cabibbo-suppressed decay D+ → K+π+π–π0 is ...reported. After removing decays that contain narrow intermediate resonances, including D+ → K+η , D+ → K+ω, and D+ → K+Φ, the branching fraction of the decay D+ → K+π+π–π0 is measured to be (1.13 ± 0.08stat ± 0.03syst) × 10–3. The ratio of branching fractions of D+ → K+π+π–π0 over D+ → K–π+π+π0 is found to be (1.81 ± 0.15)%, which corresponds to (6.28 ± 0.52) tan4 θC, where θC is the Cabibbo mixing angle. This ratio is significantly larger than the corresponding ratios for other doubly Cabibbo-suppressed decays. The asymmetry of the branching fractions of charge-conjugated decays D± → K±π±π∓π0 is also determined, and no evidence for CP violation is found. In addition, the first evidence for the D+ → K+ω decay, with a statistical significance of 3.3σ, is presented and the branching fraction is measured to be B(D+ → K+ω) = (5.7 $^{+2.5}_{–2.1 stat}$ ± 0. 2syst) × 10–5.
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CMK, CTK, FMFMET, IJS, NUK, PNG, UL, UM
Observation of χcJ→4KS0 Ablikim, M
Physical review. D,
03/2019, Volume:
99, Issue:
5
Journal Article
Peer reviewed
Open access
By analyzing (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector operating at the BEPCII collider, the decays of χcJ→4KS0 (J=0, 1, 2) are observed for the first time with statistical ...significances of 26.5σ, 5.9σ and 11.4σ, respectively. The product branching fractions of ψ(3686)→γχcJ, χcJ→4KS0 are presented, and the branching fractions of χcJ→4KS0 decays are determined to be Bχc0→4KS0=(5.76±0.34±0.38)×10−4, Bχc1→4KS0=(0.35±0.09±0.03)×10−4 and Bχc2→4KS0=(1.14±0.15±0.08)×10−4, where the first uncertainties are statistical and the second are systematic, respectively.
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We study the decays Λ+c → Ληπ+ and Σ(1385)+η based on Λ+cΛ¯c pairs produced in e+e– collisions at a center-of-mass energy of √s = 4.6 GeV, corresponding to an integrated luminosity of 567 pb–1.The ...data sample was accumulated with the BESIII detector at the BEPCII collider. The branching fractions are measured to be B(Λ+c → Ληπ+) = (1.84 ± 0.21(stat) ± 0.15(syst))% and B(Λ+c → Σ(1385)+η) = (0.91 ± 0.18(stat) ± 0.09(syst))%, constituting the most precise measurements to date.
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Using a low-background sample of 2.6 ×105 J/ψ → ωη (ω → π+π–π0, η → γγ) events, about 5 times larger statistics than previous experiments, we present a Dalitz plot analysis of the decay ω → π+π–π0. ...It is found that the Dalitz plot distribution differs from the pure P -wave phase space with a statistical significance of 18.9σ. The parameters from the fit to data are in reasonable agreement with those without the cross-channel effect within the dispersive framework, which indicates that the cross-channel effect in ω → π+π–π0 is not significant.
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Based on e+e- collision data sample corresponding to an integrated luminosity of 2.93 fb-1 taken at a center-of-mass energy of 3.773 GeV by the BESIII detector, we report the measurements of the ...absolute branching fractions of D0 → K+K-π0π0 , D0 → KS0KS0π+π- , D0 → KS0K-π+π0 , D0 → KS0K+π-π0 , D+ → K+K-π+π0 , D+ → KS0K+π0π0 , D+ → KS0K-π+π+ , D+ → KS0K+π+π- , and D+ → KS0KS0π+π0 . The decays D0 → K+K-π0π0 , D0 → KS0K-π+π0 , D0 → KS0K+π-π0 , D+ → KS0KS0π+π0 , and D+ → KS0K+π0π0 are observed for the first time. The branching fractions of the decays D0 → KS0KS0π+π- , D+ → K+K-π+π0 , D+ → KS0K-π+π+ , and D+ → KS0K+π+π- are measured with improved precision compared to the world-average values.
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CMK, CTK, FMFMET, IJS, NUK, PNG, UM
Background
Increasing neuroimaging studies have revealed grey matter (GM) anomalies of several brain regions by voxel‐based morphometry (VBM) studies in patients with neuropathic pain. The changes ...have been suggested to be related to central sensitization. Our aim was to investigate concurrence across VBM studies to identify whether different subtypes of neuropathic pain share a common pathophysiological basis revealed by structural abnormalities.
Methods
A systematic search of VBM studies of patients with neuropathic pain and healthy controls published in PubMed and Embase databases from January 2000 to March 2014 was conducted. A quantitative meta‐analysis of whole‐brain VBM studies in patients with neuropathic pain compared with healthy controls was performed by means of effect‐size signed differential mapping.
Results
Ten studies comprising 240 patients with neuropathic pain and 263 healthy subjects were systematically included in the present study. Compared to healthy controls, the patients showed consistent decreased GM in bilateral anterior insula and thalamus, right superior frontal gyrus and left postcentral gyrus, and increased GM in right medial frontal gyrus and right posterior insula. The results remained largely unchanged in the following jackknife sensitivity analysis.
Conclusions
This meta‐analysis shows strong evidence of brain GM anomalies within the pain matrix in patients with neuropathic pain compared with healthy subjects. Further studies are needed to determine whether the reported changes are specific to neuropathic pain or whether they may be common to other chronic pain.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
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