Transform methods for precision continuum and control models of flexible space structures

An open loop optimal control algorithm is developed for general flexible structures, based on Laplace transform methods. A distributed parameter model of the structure is first presented, followed by a derivation of the optimal control algorithm. The control inputs are expressed in terms of their Fourier series expansions, so that a numerical solution can be easily obtained. The algorithm deals directly with the transcendental transfer functions from control inputs to outputs of interest, and structural deformation penalties, as well as penalties on control effort, are included in the formulation. The algorithm is applied to several structures of increasing complexity to show its generality

The development of an acoustic levitation test facility for cloud physics research

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.Includes bibliographical references (leaves 135-136).by Victor D. Lupi.M.S

The use of mathematically exact solutions of structural dynamics models for structural control design

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.Includes bibliographical references (leaves 219-225).by Victor D. Lupi.Ph.D

Lambda(+)(C) production in pb-pb collisions at root S-NN=5.02 TeV

A measurement of the production of prompt +cbaryons in Pb–Pb collisions at √sNN=5.02 TeV with the ALICE detector at the LHC is reported. The +cand −cwere reconstructed at midrapidity (|y| <0.5) via the hadronic decay channel +c→pK0S(and charge conjugate) in the transverse momentum and centrality intervals 6 <pT<12 GeV/cand 0–80%. The +c/D0ratio, which is sensitive to the charm quark hadronisation mechanisms in the medium, is measured and found to be larger than the ratio measured in minimum-bias pp collisions at √s=7TeV and in p–Pb collisions at √sNN=5.02 TeV. In particular, the values in p–Pb and Pb–Pb collisions differ by about two standard deviations of the combined statistical and systematic uncertainties in the common pTinterval covered by the measurements in the two collision systems. The +c/D0ratio is also compared with model calculations including different implementations of charm quark hadronisation. The measured ratio is reproduced by models implementing a pure coalescence scenario, while adding a fragmentation contribution leads to an underestimation. The +cnuclear modification factor, RAA, is also presented. The measured values of the RAAof +c, D+sand non-strange D mesons are compatible within the combined statistical and systematic uncertainties. They show, however, a hint of a hierarchy (RD0AA<RD+sAA<R +cAA), conceivable with a contribution from coalescence mechanisms to charm hadron formation in the medium

Λ c+ production in Pb–Pb collisions at s NN =5.02 TeV

AA measurement of the production of prompt Λ c + baryons in Pb–Pb collisions at s NN =5.02 TeV with the ALICE detector at the LHC is reported. The Λ c + and Λ‾ c − were reconstructed at midrapidity (|y|&lt;0.5) via the hadronic decay channel Λ c + →pK S 0 (and charge conjugate) in the transverse momentum and centrality intervals