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Sökning: WFRF:(Gerber Christian N.)

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1.
  • Abazov, V. M., et al. (författare)
  • Measurement of the production fraction times branching fraction f(b -> Lambda(b)) . B(Lambda(b) -> J/psi Lambda)
  • 2011
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 84:3, s. 031102-
  • Tidskriftsartikel (refereegranskat)abstract
    • The Lambda(b)(udb) baryon is observed in the decay Lambda(b) -> J/psi Lambda using 6.1fb(-1) of p (p) over bar collisions collected with the D0 detector at root s = 1/96 TeV. The production fraction multiplied by the branching fraction for this decay relative to that for the decay B(0) -> J/psi K(s)(0) is measured to be 0.345 +/- 0.034(stat) +/- 0.033(syst) +/- 0.003(PDG). Using the world average value of f(b -> B(0)) . B(B(0) -> J/psi K(s)(0) = (1.74 +/- 0.08) x 10(-5), we obtain f(b -> Lambda(b)) . B(Lambda(b) -> J/psi Lambda) = (6.01 +/- 0.60(stat) +/- 0.58(syst) +/- 0.28(PDG)) x 10(-5). This measurement represents an improvement in precision by about a factor of 3 with respect to the current world average.
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2.
  • Hirsch, Martin R., et al. (författare)
  • Design and implementation of heterogeneous distributed controllers according to the IEC 61499 standard : A case study
  • 2007
  • Ingår i: 2006 4th IEEE International Conference on Industrial Informatics. - Piscataway, NJ : IEEE Communications Society. - 0780397002 ; , s. 829-834
  • Konferensbidrag (refereegranskat)abstract
    • This paper addresses solutions on integration and reuse of heterogeneous distributed controllers. In particular it shows the way to integrate the emerging IEC 61499 standard into the established IEC 61131 automation frameworks. It is illustrated on example of a modular manufacturing cell with distributed control units, how to realize distribution of heterogeneous controllers using the IEC 61499 standard and how to integrate these controllers into the plant formerly controlled by distributed PLCs. Therefore, methodologies and patterns for the design of distributed controllers and their implementation variants are introduced. In addition, the paper describes the details of a higher level communication protocol used to implement interaction between the modules. A framework for the simulation of IEC 61499 applications is also introduced
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