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Sökning: WFRF:(Ren L.X.)

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1.
  • Ablikim, M., et al. (författare)
  • Measurements of (XcJ)-> K+K-K+K- decays
  • 2006
  • Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 642:3, s. 197-202
  • Tidskriftsartikel (refereegranskat)abstract
    • Using 14M psi(2S) events taken with the BESII detector, chi(cJ) -> 2(K+K-) decays are studied. For the four-kaon final state, the branching fractions are B(chi(c0,1,2) ->.2(K+K-)) = (3.48 +/- 0.23 +/- 0.47) x 10(-3), (0.70 +/- 0.13 +/- 0.10) x 10(-3), and (2.17 +/- 0.20 +/- 0.31) x 10(-3). For the phi K+K- final state, the branching fractions, which are measured for the first time, are B(chi(c0,1,2) -> phi K+K-) = (1.03 +/- 0.22 +/- 0.15) x 10(-3), (0.46 +/- 0.16 +/- 0.06) x 10(-3), and (1.67 +/- 0.26 +/- 0.24) x 10(-4). For the phi phi final state, B(chi(c0,2) -> phi phi) = (0.94 +/- 0.21 +/- 0.13) x 10(-3) and (1.70 +/- 0.30 +/- 0.25) x 10(-3).
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2.
  • Ren, L.X. (författare)
  • Experimental study of impact-induced vibrations of a simple viscoelastic column model
  • 1985
  • Ingår i: Journal of Sound and Vibration. - 0022-460X .- 1095-8568. ; 99:1, s. 17-27
  • Tidskriftsartikel (refereegranskat)abstract
    • The longitudinal and transverse displacements of an almost axially impacted two-degree-of-freedom viscoelastic cantilever column model have been determined experimentally. Cases for various ratios of natural frequencies of transverse to longitudinal vibrations and for different small angles of incidence have been investigated. The results obtained are compared with results of theoretical analysis. Good agreement is found
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3.
  • Ren, L.X., et al. (författare)
  • Impact-induced vibrations of a simple viscoelastic column model
  • 1983
  • Ingår i: Journal of Sound and Vibration. - 0022-460X .- 1095-8568. ; 89:2, s. 261-272
  • Tidskriftsartikel (refereegranskat)abstract
    • A two-degree-of-freedom model for an almost-axially impacted viscoelastic cantilever column is analyzed. The impact load is produced by a mass striking the free end of the column. Under the assumption of small displacements two second-order non-linear ordinary differential equations for the coupled longitudinal and transverse vibrations of the column are derived. In the absence of damping these equations of motion are reduced to Mathieu's equation through the use of a perturbation method. The excitation parameters are (i) the natural frequency of small amplitude transverse vibrations of the undamped column and (ii) the initial velocity of the end of the column
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