523,012 research outputs found
Control and Filtering for Discrete Linear Repetitive Processes with H infty and ell 2--ell infty Performance
No full textRepetitive processes are characterized by a series of sweeps, termed passes, through a set of dynamics defined over a finite duration known as the pass length. On each pass an output, termed the pass profile, is produced which acts as a forcing function on, and hence contributes to, the dynamics of the next pass profile. This can lead to oscillations which increase in amplitude in the pass to pass direction and cannot be controlled by standard control laws. Here we give new results on the design of physically based control laws for the sub-class of so-called discrete linear repetitive processes which arise in applications areas such as iterative learning control. The main contribution is to show how control law design can be undertaken within the framework of a general robust filtering problem with guaranteed levels of performance. In particular, we develop algorithms for the design of an H? and dynamic output feedback controller and filter which guarantees that the resulting controlled (filtering error) process, respectively, is stable along the pass and has prescribed disturbance attenuation performance as measured by and – norms
Bønnelycke, E-M. S., Giacon, T. A., Bosco, G., Kainerstorfer, J. M., Paganini, M., Ruesch, A., Wu, J., McKnight, J. C. "Cerebral haemodynamic and systemic physiological changes in trained freedivers completing sled-assisted dives to two different depths"
No full textRaw NIRS and arterial blood gas data included in the analysis for the following paper: Bønnelycke, E-M. S., Giacon, T. A., Bosco, G., Kainerstorfer, J. M., Paganini, M., Ruesch, A., Wu, J., McKnight, J. C. "Cerebral haemodynamic and systemic physiological changes in trained freedivers completing sled-assisted dives to two different depths".</p
Toward photon storage inoptically driven color centers in diamond
No full textAn ever increasing effort has been devoted over the years to develop techniques for manipulating light in optical devices. Electromagnetic induced transparency (EIT) is one of these techniques that has recently led to an astonishing control on light wave propagation in ultracold clouds of alkali atoms. EIT may be employed to realize a photonic band gaps that are controllable through the parameters of an external standing light wave pattern [1]. Such gaseous approaches are not however suitable for on-chip implementation. Early work on control over photonic band-gap comprises, e.g., structures built from the periodic complex susceptibility of quantum well excitons whose optical properties can be dynamically modified through the Stark effect. Other interesting proposals to control photonic band-gaps in semiconductor heterostructures have been brought forward and where control over the band-gap is achieved through EIT in conduction intersubband transitions of a n-doped quantum well. EIT effects have also been observed in a class of solid materials exhibiting defect states, following either familiar or less familiar schemes, and among which presodimium doped Y2SiO5 and diamond containing nitrogen vacancies (N-V) color centers are perhaps the most ubiquitous ones. Color centers in diamond, in particular, have attracted over the past few years a renewed interest for their potential as single-photon sources and are attractive qubit candidates as they behaves a bit like an atom trapped in the diamond lattice. These centers can have extremely long-lived spin coherence because the diamond lattice is composed primarily of 12C, which has zero nuclear spin. In addition, N-V color centers also have interesting optical properties as they exhibit a configuration with two ground state levels connected to a common excited state by optical transitions of moderate strength leading to a lambda-type level configuration required for the observation of EIT [2,3]. This has been exploited to devise a novel photonic band-gap mechanism [4]. We here study the propagation of a very week optical pulse in the band-gap region of N-V diamond crystals. Our calculations show that adopting realistic parameters, as taken from recent experiments on coherent population trapping in N-V color centers, nearly complete reflectivities can be attained in a mm long diamond sample. This occurs when most probe frequency components lie inside the band-gap, yielding instead controllable loss and distortion as the incident probe pulse falls outside the gap. The relevant photonic band-gap may be all optically controlled while its well developed structure is seen to arise from the reduced values of residual absorption in the EIT region. [1] M. Artoni et al., Phys. Rev. Lett. 96, 073905 (2006). [2] C. Wei et al., Phys. Rev. A 60, 2540 (1999). [3] P. Hemmer, et al.,Opt. Lett. 26, 361 (2001). [4] Q.-Y. He, et al., Phys. Rev. B 73, 195124 (2006)
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
Full text linkFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
J Wu
No full textResearch School of Social Sciences - Research Scholars - S. Matsuura, D. Hindley, J. D. Playford, K. G. Jones, G. A. Waterson, Dr. R. R. Brown, Dr. Prgybylski, Dr. D. A. Low, Dr. W. E. Salter, S. R. Adke, Mr. G. Docker, A. R. Barcan, Dr. J. C. Harsanyi, Dr. K. H. Burley, Miss Ann Myers, G. P. King, J. Stockwin, Mr. R. G. Boyd, Dr. H. O. Pappe, Dr. J. A. Barnard, R. J. Lawrence, K. G. Pont, J. Caldwell, N. G. Cain, D. W. Dockrill, C. S. Ross, Abraham Harari, I. Fairbanks, Mr. G. Pursell, F. L. Jones, M. Wu, David B. Heron, D. K. Singh, H. Yuan T'ien, Owen Michael Roe, F. S. Henr
Notes on the Flora of Taiwan (35) — Scutellaria taipeiensis T. C. Huang, A. Hsiao et M. J. Wu sp. nov. (Lamiaceae)
No full textA comparative study of corolla types, pollen features, nutlet coat ornamentation and
chromosome numbers of Scutellaria (Lamiaceae) species in Taiwan has been conducted. The result
reveals that we have a new species so that Scutellaria taipeiensis T. C. Huang, A. Hsiao et M. J. Wu
sp. nov. is here proposed. A key to the species, species description and illustrations, and other relevant
information are provided
Garantiert reiner Cacao. J. Latscha Frankfurt a. M.
No full textGARANTIERT REINER CACAO. J. LATSCHA FRANKFURT A. M.
Garantiert reiner Cacao. J. Latscha Frankfurt a. M. ( -
A boundary element model for nonlinear viscoelasticity
No full textThe boundary element methodology is applied to the analysis of non-linear viscoelastic solids. Theadopted non-linear model uses the same relaxation moduli as the respective linear relations but with a time shiftdepending on the volumetric strain. Nonlinearity introduces an irreducible domain integral into the originalintegral equation derived for linear viscoelastic solids. This necessitates the evaluation of domain strains, whichrelies on proper differentiation of an integral with a strong kernel singularity. A time domain formulation isimplemented through a numerical integration algorithm. The effectiveness of the developed numerical tool isdemonstrated through the analysis of a plate with a central crack. The results are compared with respectivepredictions by the finite element metho
Brief von J. M. Keynes, Secretary an Kurt Rothschild
No full textBRIEF VON J. M. KEYNES, SECRETARY AN KURT ROTHSCHILD
Brief von J. M. Keynes, Secretary an Kurt Rothschild ([1]
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