LEADER 01211nam a2200241 i 4500 001 991003531369707536 008 180806s2018 it m ||| | eng d 035 $ab14348111-39ule_inst 040 $aBibl. Dip.le Aggr. Matematica e Fisica - Sez. Fisica$beng 100 1 $aNocco, Andrea$0480520 245 10$aAuxetic materials, properties and applications for a wearable capacitive technology. Tesi di laurea magistrale /$claureando Andrea Nocco ; relatori Giorgio De Nunzio, Massimo De Vittorio, Francesco Rizzi, Salvatore Puce 260 $aLecce :$bUniversità del Salento. Facoltà di Scienze. Corso di Laurea Magistrale in Fisica,$ca.a. 2017-18 300 $a164 p. :$bill. ;$c30 cm 700 1 $aDe Nunzio, Giorgio 700 1 $aDe Vittorio, Massimo 700 1 $aRizzi, Francesco 700 1 $aPuce, Salvatore 907 $a.b14348111$b03-07-20$c06-08-18 912 $a991003531369707536 945 $aLE006 T1165$g1$i2006000101530$lle006$og$pE0.00$q-$rn$so $t0$u0$v0$w0$x0$y.i15857438$z06-08-18 996 $aAuxetic materials, properties and applications for a wearable capacitive technology. Tesi di laurea magistrale$91751473 997 $aUNISALENTO 998 $ale006$b06-08-18$cm$da $e-$feng$git $h0$i0 LEADER 03814nam 2200373 450 001 9910688487503321 005 20230628161825.0 035 $a(CKB)5400000000040386 035 $a(NjHacI)995400000000040386 035 $a(EXLCZ)995400000000040386 100 $a20230628d2005 uy 0 101 0 $aeng 135 $aur||||||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aShallow turbulent wake flows $emomentum and mass transfer due to large-scale coherent vortical structures /$fCarl Friedrich von Carmer 210 1$aKarlsruhe :$cKIT Scientific Publishing,$d2005. 215 $a1 online resource (xxvi, 398 pages) 225 1 $aDissertationsreihe am Institut fu?r Hydromechanik der Universita?t Karlsruhe (TH) ;$vBand 2 311 $a1000003453 330 $aShallow turbulent wake flows are generated by large obstacles - like islands or headlands - introduced to shallow turbulent open-channel flows. Large-scale quasi two-dimensional vortices may shed off from an obstacle, and advect downstream in a vertical shear flow with predominantly small-scale turbulence induced by bottom friction. Experimental, analytical, and numerical techniques are employed in the present study to characterize the mean flow and turbulence properties of shallow wakes; mechanisms of generation and decay of large-scale vortical structures are clarified, as is their influence on momentum and mass transport in shallow wakes; the global and local stability of shallow wakes is analyzed and evidenced from experimental data. Part I of this work covers non-intrusive optical measurement techniques especially adapted to investigate shallow shear flows. Flow velocities and mass concentrations are obtained (i) point-wise with high spatiotemporal resolution using a combinded LDV-LIF system, and (ii) field-wise using near-surface PIV and depth-averaged PCA systems with a coupling by phase-resolved averaging. Improved algorithms for the evaluation of mass concentrations are based on hydro-optical models of the underlying fluorescence and light attenuation processes. Part II addresses the time-mean description of shallow wake flows. The stochastic description of the turbulence fields displays a characteristic spectral distribution both of kinetic energy and of mass variance, which is partially consistent with the theory of unbounded 2D turbulence at large scales, and with the theory of homogeneous 3D turbulence at small scales. An integral wake model including the effect of bottom friction is derived analytically, and is validated by experimental data. The time-mean distributions of flow velocities and of mass concentration allow to identify wake near fields and far fields with specific asymptotic wake developments. Wake stability classes are associated with local stability regions suggested by linear stability analyses. Part III elaborates the structure and dynamics of quasi-periodic wake flows and the significance of large-scale eddies. This involves a structure identification scheme to educe individual vortices, and a phase-resolved averaging procedure to decompose the flow fields into large-scale coherent and small-scale turbulent parts. A Numerical Particle Tracking technique is employed to model the mass transport and to elucidate different diffusion and dispersion effects. 410 0$aDissertationsreihe am Institut fu?r Hydromechanik der Universita?t Karlsruhe (TH) ;$vBand 2. 517 $aShallow turbulent wake flows 606 $aFlow meters 615 0$aFlow meters. 676 $a681.28 700 $aCarmer$b Carl Friedrich von$01368712 801 0$bNjHacI 801 1$bNjHacl 906 $aBOOK 912 $a9910688487503321 996 $aShallow turbulent wake flows$93394608 997 $aUNINA