Relevant bibliographies by topics / Progressive waves

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Progressive waves'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 October 2024

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Journal articles on the topic "Progressive waves"

1

Oh, C. H., and Rosy Teh. "Nonabelian progressive waves." Journal of Mathematical Physics 26, no. 4 (1985): 841–44. http://dx.doi.org/10.1063/1.526576.

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Utkin, Andrei B. "Mathieu Progressive Waves." Communications in Theoretical Physics 56, no. 4 (2011): 733–39. http://dx.doi.org/10.1088/0253-6102/56/4/23.

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Becker, Janet M., and John W. Miles. "Progressive radial cross-waves." Journal of Fluid Mechanics 245, no. -1 (1992): 29. http://dx.doi.org/10.1017/s0022112092000338.

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Miles, John, and Janet Becker. "Parametrically excited, progressive cross-waves." Journal of Fluid Mechanics 186 (January 1988): 129–46. http://dx.doi.org/10.1017/s0022112088000072.

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The variational formulation of the nonlinear wavemaker problem, previously applied (Miles 1988) to cross-waves in a short tank, is extended to allow for slow spatial, as well as slow temporal, variation of cross-waves in a long tank. The resulting evolution equations for the envelope of the cross-waves are equivalent to those derived by Jones (1984) and may be combined to obtain a cubic Schrödinger equation in a semi-infinite domain. The corresponding criterion for the stability of plane waves (i.e. for the temporal decay of cross-waves) agrees with Jones but differs from Mahony (1972). Weak damping is incorporated, and those stationary envelopes that are evanescent at large distances from the wavemaker are determined through analytical approximations and numerical integration and compared with the experimental observations of Barnard & Pritchard (1972) and the numerical calculations of Lichter & Chen (1987). These comparisons suggest that stationary envelopes with either no or one maximum are stable for sufficiently small amplitudes (solutions with multiple maxima may be stable but more difficult to attain) and evolve into limit cycles for somewhat larger amplitudes, but the analytical question of stability remains open.
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Peregrine, D. H. "Tables of Progressive Gravity Waves." Applied Ocean Research 9, no. 1 (1987): 53. http://dx.doi.org/10.1016/0141-1187(87)90032-0.

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Shakhin, Victor M., and Tatiana V. Shakhina. "COMPENSATORY REVERSE FLOW OF PROGRESSIVE WAVES WITH FINITE AMPLITUDE." Coastal Engineering Proceedings, no. 35 (June 23, 2017): 9. http://dx.doi.org/10.9753/icce.v35.waves.9.

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This paper is devoted to problem of mass transport of fluid for the surface progressive waves. Both Stokes and cnoidal waves are considered. New solutions for the transitional current are obtained. It is discovered that the mass transport of fluid in the direction of wave propagation exists only in the top layer. In the underlying layers a compensatory reverse flow is formed. The existence of a compensatory flow was verified experimentally. It is revealed that theoretical results duly conform to experimental data.
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Restrepo, Juan M., and Jorge M. Ramirez. "Transport due to Transient Progressive Waves." Journal of Physical Oceanography 49, no. 9 (2019): 2323–36. http://dx.doi.org/10.1175/jpo-d-19-0087.1.

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AbstractMaking use of a Lagrangian description, we interpret the kinematics and analyze the mean transport due to numerically generated transient progressive waves, including breaking waves. The waves are packets and are generated with a boundary-forced, air–water, two-phase Navier–Stokes solver. These transient waves produce transient transport, which can sometimes be larger than what would be estimated using estimates developed for translationally invariant progressive waves. We identify the critical assumption that makes our standard notion of the steady Stokes drift inapplicable to the data and explain how and in what sense the transport due to transient waves can be larger than the steady counterpart. A comprehensive analysis of the data in the Lagrangian framework leads us to conclude that much of the transport can be understood using an irrotational approximation of the velocity, even though the simulations use Navier–Stokes fluid simulations with moderately high Reynolds numbers. Armed with this understanding, it is possible to formulate a simple Lagrangian model that captures the mean transport and variance of transport for a large range of wave amplitudes. For large-amplitude waves, the parcel paths in the neighborhood of the free surface exhibit increased dispersion and lingering transport due to the generation of vorticity. We examined the wave-breaking case. For this case, it is possible to characterize the transport very well, away from the wave boundary layer, and approximately using a simple model that captures the unresolved breaking dynamics via a stochastic parameterization.
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Stiassnie, Michael, and Raphael Stuhlmeier. "Progressive waves on a blunt interface." Discrete & Continuous Dynamical Systems - A 34, no. 8 (2014): 3171–82. http://dx.doi.org/10.3934/dcds.2014.34.3171.

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Kalinichenko, V. A., and S. Ya Sekerzh-Zen’kovich. "Excitation of progressive-standing faraday waves." Doklady Physics 56, no. 6 (2011): 343–47. http://dx.doi.org/10.1134/s1028335811060024.

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Abohadima, Samir, and Masahiko Isobe. "Limiting criteria of permanent progressive waves." Coastal Engineering 44, no. 3 (2002): 231–37. http://dx.doi.org/10.1016/s0378-3839(01)00033-3.

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Dissertations / Theses on the topic "Progressive waves"

1

Swan, Christopher. "The higher order dynamics of progressive waves." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328829.

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Seez, William. "Rotational, progressive and periodic free-surface waves : determination and stability." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0130.

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En zones côtières, une onde se propageant à la surface de l'océan est fortement influencée par le courant sous-jacent. Les profiles de vitesses sont variables en profondeur du fait du vent soufflant à la surface et des frottements au fond. En considérant les équations d'Euler pour un fluide non-visqueux et incompressible, accompagnées des conditions de surface cinématiques et dynamiques appropriées, l'interaction entre une onde de surface bi-dimensionnelle, progressive et périodique et un courant sous-jacent est étudiée. En ne considérant pas uniquement un champs de vitesses dérivant d'un potentiel scalaire, ce travail étend le modèle d'un courant cisaillé linéairement à des profiles de courant définis par une classe de fonctions de vorticité exponentielle.Il est montré que ces profiles de courant bi-dimensionnelles sont linéairement stables en l'absence d'une perturbation à la surface. L'influence du courant sous-jacent sur des ondes d'amplitude et de profondeur arbitraire est ensuite étudiée numériquement, en présence ou non de capillarité. Malgré le fait que la célérité et l'énergie potentielle et cinématique de l'onde sont fortement influencées par le paramètre de non-linéarité que représente la cambrure, il est montré que l'effet de la vorticité est non-négligeable, surtout pour des ondes de gravité pure. Finalement, des résultats sont présentés pour une étude de stabilité linéaire d'ondes d'amplitude finie (2D) perturbées en trois dimensions. Les classes d'instabilité classiques sont détectées en présence de vorticité constante et non-constante. De plus, un mécanisme est proposé pour une instabilité tri-dimensionnelle dominante en présence de vorticité<br>In coastal zones, waves propagating at the surface of the ocean are strongly influenced by underlying shear currents. Depth-dependent velocity profiles are generated by wind blowing at the surface and friction at the bed. Considering the Euler equations for an inviscid and incompressible fluid, along with the appropriate free-surface kinematic and dynamic boundary conditions, the interaction between a two-dimensional progressive periodic free-surface wave of permanent form and an underlying current is studied. By not assuming that the velocity field derives from a scalar potential, this work extends the linear, constant vorticity, shear model to velocity profiles defined by a class of exponential vorticity functions. The two-dimensional current profiles are first shown to be linearly stable in the absence of a free-surface perturbation. The influence of the underlying shear on waves of arbitrary amplitude and depth is then studied numerically, both in the absence and presence of capillarity. Although the celerity and potential and kinetic energy of the wave are strongly influenced by the nonlinear wave steepness parameter, the effect of vorticity is shown to be non-negligible, especially for pure gravity waves. Finally, results are presented for a linear stability analysis of these finite amplitude (2D) waves under three-dimensional perturbations. It is found that the classical classes of instability corresponding to four and five wave resonances are recovered in three-dimensions in the presence of constant or depth-dependent vorticities. Finally, a mechanism is proposed for the dominant three-dimensional instability caused by the presence of an underlying shear current
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Matsumuro, Takayuki. "Advanced Beam Forming by Synthesizing Spherical Waves for Progressive Microwave Power Transmission." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225602.

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Morris-Thomas, Michael. "An investigation into wave run-up on vertical surface piercing cylinders in monochromatic waves." University of Western Australia. School of Oil and Gas Engineering, 2003. http://theses.library.uwa.edu.au/adt-WU2004.0010.

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[Formulae and special characters can only be approximated here. Please see the pdf version of the abstract for an accurate reproduction.] Wave run-up is the vertical uprush of water when an incident wave impinges on a free- surface penetrating body. For large volume offshore structures the wave run-up on the weather side of the supporting columns is particularly important for air-gap design and ultimately the avoidance of pressure impulse loads on the underside of the deck structure. This investigation focuses on the limitations of conventional wave diffraction theory, where the free-surface boundary condition is treated by a Stokes expansion, in predicting the harmonic components of the wave run-up, and the presentation of a simplified procedure for the prediction of wave run-up. The wave run-up is studied on fixed vertical cylinders in plane progressive waves. These progressive waves are of a form suitable for description by Stokes' wave theory whereby the typical energy content of a wave train consists of one fundamental harmonic and corresponding phase locked Fourier components. The choice of monochromatic waves is indicative of ocean environments for large volume structures in the diffraction regime where the assumption of potential flow theory is applicable, or more formally A/a < Ο(1) (A and a being the wave amplitude and cylinder radius respectively). One of the unique aspects of this work is the investigation of column geometry effects - in terms of square cylinders with rounded edges - on the wave run-up. The rounded edges of each cylinder are described by the dimensionless parameter rc/a which denotes the ratio of edge corner radius to half-width of a typical column with longitudinal axis perpendicular to the quiescent free-surface. An experimental campaign was undertaken where the wave run-up on a fixed column in plane progressive waves was measured with wire probes located close to the cylinder. Based on an appropriate dimensional analysis, the wave environment was represented by a parametric variation of the scattering parameter ka and wave steepness kA (where k denotes the wave number). The effect of column geometry was investigated by varying the edge corner radius ratio within the domain 0 <=rc/a <= 1, where the upper and lower bounds correspond to a circular and square shaped cylinder respectively. The water depth is assumed infinite so that the wave run-up caused purely by wave-structure interaction is examined without the additional influence of a non-decaying horizontal fluid velocity and finite depth effects on wave dispersion. The zero-, first-, second- and third-harmonics of the wave run-up are examined to determine the importance of each with regard to local wave diffraction and incident wave non-linearities. The modulus and phase of these harmonics are compared to corresponding theoretical predictions from conventional diffraction theory to second-order in wave steepness. As a result, a basis is formed for the applicability of a Stokes expansion to the free-surface boundary condition of the diffraction problem, and its limitations in terms of local wave scattering and incident wave non-linearities. An analytical approach is pursued and solved in the long wavelength regime for the interaction of a plane progressive wave with a circular cylinder in an ideal fluid. The classical Stokesian assumption of infinitesimal wave amplitude is invoked to treat the free-surface boundary condition along with an unconventional requirement that the cylinder width is assumed much smaller than the incident wavelength. This additional assumption is justified because critical wavelengths for wave run-up on a fixed cylinder are typically much larger in magnitude than the cylinder's width. In the solution, two coupled perturbation schemes, incorporating a classical Stokes expansion and cylinder slenderness expansion, are invoked and the boundary value problem solved to third-order. The formulation of the diffraction problem in this manner allows for third-harmonic diffraction effects and higher-order effects operating at the first-harmonic to be found. In general, the complete wave run-up is not well accounted for by a second-order Stokes expansion of the free-surface boundary condition and wave elevation. This is however, dependent upon the coupling of ka and kA. In particular, whilst the modulus and phase of the second-harmonic are moderately predicted, the mean set-up is not well predicted by a second-order Stokes expansion scheme. This is thought to be caused by higher than second-order non-linear effects since experimental evidence has revealed higher-order diffraction effects operating at the first-harmonic in waves of moderate to large steepness when k < < 1. These higher-order effects, operating at the first-harmonic, can be partially accounted for by the proposed long wavelength formulation. For small ka and large kA, subsequent comparisons with measured results do indeed provide a better agreement than the classical linear diffraction solution of Havelock (1940). To account for the complete wave run-up, a unique approach has been adopted where a correction is applied to a first-harmonic analytical solution. The remaining non-linear portion is accounted for by two methods. The first method is based on regression analysis in terms of ka and kA and provides an additive correction to the first-harmonic solution. The second method involves an amplification correction of the first-harmonic. This utilises Bernoulli's equation applied at the mean free-surface position where the constant of proportionality is empirically determined and is inversely proportional to ka. The experimental and numerical results suggest that the wave run-up increases as rc/a--› 0, however this is most significant for short waves and long waves of large steepness. Of the harmonic components, experimental evidence suggests that the effect of a variation in rc/a on the wave run-up is particularly significant for the first-harmonic only. Furthermore, the corner radius effect on the first-harmonic wave run-up is well predicted by numerical calculations using the boundary element method. Given this, the proposed simplified wave run-up model includes an additional geometry correction which accounts for rc/a to first-order in local wave diffraction. From a practical view point, it is the simplified model that is most useful for platform designers to predict the wave run-up on a surface piercing column. It is computationally inexpensive and the comparison of this model with measured results has proved more promising than previously proposed schemes.
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Pujol, Company M. Dolors. "Waves and turbulence on submerged and emergent aquatic vegetation." Doctoral thesis, Universitat de Girona, 2013. http://hdl.handle.net/10803/111336.

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Coastal zones are governed by physical forces originating from tidal currents, waves, winds and night convection, amongst others, and are characterized by the presence of canopy meadows. This thesis studies the hydrodynamic in a fluid dominated by: nearly isotropic turbulence, progressive waves and breaking waves in different canopy models. Under nearly isotropic turbulence sheltering is enhanced by a reduction in the plant-to-plant distance. Under progressive waves sheltering is associated with the reduction of wave velocity at the top of submerged rigid canopy. Sheltering observed in the submerged flexible model is caused by blade movement which absorbes the energy. Emergent rigid vegetation shows sheltering. On the other hand, for some specific progressive wave conditions and plant densities and under a fluid dominated by breaking waves, turbulence increases within the meadow if Reynolds number, based on wave velocity, is larger than 300<br>Les zones costeres estan governades per forces físiques originades per la marea, l’onatge, i la convecció nocturna, entre d’altres, i caracteritzades per la presència de plantes aquàtiques. Aquesta tesi té per objectiu estudiar la hidrodinàmica d’un fluid dominat per: turbulència quasi-isotròpica, onades progressives i onades trencants en diferents models de vegetació. En un fluid dominat per turbulència isotròpica, la reducció de la turbulència augmenta al reduir la distància entre plantes. En un fluid dominat per onades progressives, la disminució de la turbulència està associada a la reducció de la velocitat d’onada al cim de la vegetació. Aquesta reducció s’observa en plantes submergides flexibles degut a que el moviment de les plantes absorbeix l’energia. La vegetació emergent també redueix la turbulència. Per condicions específiques d’onades progressives i densitat de plantes i sota un fluid dominat per onades trencants, la turbulència incrementa si el número de Reynolds és més gran que 300
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Fimiani, Fosca. "Study of the calibration method of pressure-velocity probes and its application in a field of progressive plane waves." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10817/.

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This dissertation presents a calibration procedure for a pressure velocity probe. The dissertation is divided into four main chapters. The first chapter is divided into six main sections. In the firsts two, the wave equation in fluids and the velocity of sound in gases are calculated, the third section contains a general solution of the wave equation in the case of plane acoustic waves. Section four and five report the definition of the acoustic impedance and admittance, and the practical units the sound level is measured with, i.e. the decibel scale. Finally, the last section of the chapter is about the theory linked to the frequency analysis of a sound wave and includes the analysis of sound in bands and the discrete Fourier analysis, with the definition of some important functions. The second chapter describes different reference field calibration procedures that are used to calibrate the P-V probes, between them the progressive plane wave method, which is that has been used in this work. Finally, the last section of the chapter contains a description of the working principles of the two transducers that have been used, with a focus on the velocity one. The third chapter of the dissertation is devoted to the explanation of the calibration set up and the instruments used for the data acquisition and analysis. Since software routines were extremely important, this chapter includes a dedicated section on them and the proprietary routines most used are thoroughly explained. Finally, there is the description of the work that has been done, which is identified with three different phases, where the data acquired and the results obtained are presented. All the graphs and data reported were obtained through the Matlab® routine. As for the last chapter, it briefly presents all the work that has been done as well as an excursus on a new probe and on the way the procedure implemented in this dissertation could be applied in the case of a general field.
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Sun, Ruoci. "Comportement en grand temps et intégrabilité de certaines équations dispersives sur l'espace de Hardy Long time behavior of the NLS-Szegö equation Traveling waves of the quintic focusing NLS-Szegö equation Complete integrability of the Benjamin-Ono equation on the multi-soliton manifolds." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS111.

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On s'intéresse dans cette thèse à trois modèles d'équations hamiltoniennes dispersives non linéaires : l'équation de Schrödinger cubique défocalisante sur le cercle, filtrée par le projecteur de Szegö, qui enlève tous les modes de Fourier strictement négatifs (NLS--Szegö cubique), l'équation de Schrödinger quintique focalisante filtrée par le projecteur de Szegö sur la droite (NLS--Szegö quintique) et l'équation de Benjamin--Ono (BO) sur la droite. Comme pour les deux modèles précédents, l'équation de BO peut encore s'écrire sous la forme d'une équation de Schrödinger quadratique filtrée par le projecteur de Szegö. Ces trois modèles nous donnent l'occasion d'étudier les propriétés qualitatives de certaines ondes progressives, le phénomène de croissance des normes de Sobolev, le phénomène de diffusion non linéaire et certaines propriétés d'intégrabilité de systèmes dynamiques hamiltoniens. Le but de cette thèse est de comprendre l'influence des opérateurs de Szegö (non locaux) sur les équations de type Schrödinger, et d'adapter les outils liés à l'espace de Hardy sur le cercle et sur la droite. On applique aussi la méthode de forme normale de Birkhoff, l'argument de concentration--compacité, qui est précisé à travers le théorème de d'ecomposition en profils, et la transformée spectrale inverse pour résoudre ces problèmes. Dans le troisième modèle, la théorie de l'intégrabilité permet de faire le lien avec certains aspects algébriques et géométriques<br>We are interested in three non linear dispersive Hamiltonian equations: the defocusing cubic Schrödinger equation filtered by the Szegö projector on the torus that cancels every negative Fourier modes, leading to the cubic NLS--Szegö equation on the torus; the focusing quintic Schrödinger equation, which is filtered by the Szegö projector on the line, leading to the quintic NLS--Szegö equation on the line and the Benjamin--Ono (BO) equation on the line. Similarly to the other two models, the BO equation on the line can be written as a quadratic Schrödinger-type equation that is filtered by the Szegö projector on the line. These three models allow us to study their qualitative properties of some traveling waves, the phenomenon of the growth of Sobolev norms, the phenomenon of non linear scattering and some properties about the complete integrability of Hamiltonian dynamical systems. The goal of this thesis is to investigate the influence of the Szegö projector on some one-dimensional Schrödinger-type equations and to adapt the tools of the Hardy space on the torus and on the line. We also use the Birkhoff normal form transform, the concentration--compactness argument, refined as the profile decomposition theorem, and the inverse spectral transform in order to solve these problems. In the third model, the integrability theory allows to establish the connection with some algebraic and geometric aspects
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Yang, Zhicheng. "Dynamic buckling of square tubes." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243260.

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Villegas, Ruiz Eloy Ángel. "Wave aberrations in ophthalmic progressive power lenses and impact on visual quality." Doctoral thesis, Universidad de Murcia, 2009. http://hdl.handle.net/10803/10843.

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Las lentes progresivas (LP) para gafas es una solución muy extendida para la presbicia, ya que proporcionan una visión continua a todas las distancias debido a un cambio progresivo de potencia. En este trabajo se han medido las aberraciones de frente de onda espacialmente resueltas y la calidad visual en estas lentes. Además del astigmatismo que aumenta periféricamente, también se han encontrado pequeños valores de aberraciones de tercer orden, coma y trefoil, que producen un bajo deterioro de la calidad óptica y visual. El logaritmo de métricas sobre la PSF del sistema lente con ojo son las que mejor predicen la agudeza visual. Durante la primera semana de adaptación, no se aprecia una mejora significativa de la agudeza visual a través de distintas zonas de las LPs. Al comparar diferentes LPs, las aberraciones, principalmente el astigmatismo, se comporta como un colchón de agua, que se puede mover pero no eliminar.<br>Progressive lenses (PL) are designed to provide continuous vision at all distances by means a progressive change in spherical power from upper to lower zones. In this thesis, we measure the spatially resolved aberrations and the visual quality of PLs. In addition to astigmatism, third order aberrations, coma and trefoil, are also found in the PLs, but the impact of these aberrations on visual performance is limited. The logarithm of metrics on the PSF of the entire system eye plus PL are the parameters that best predict the visual acuity. There is not a significant improvement of visual acuity through the different zones of the PLs during the first week of adaptation. The current designs of PLs are somehow similar to a waterbed, with the aberrations, mainly astigmatism, being the water: they can be moved but they cannot be eliminated.
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Martinez, Thomas. "Etude d'un transformateur piézoélectrique à onde progressive et de son application aux convertisseurs de puissance." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN047/document.

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Les transformateurs piézoélectriques présentent de nombreux intérêts en électronique de puissance par rapport aux transformateurs magnétiques : gains en tension élevé, forte densité de puissance, compacité, rendements élevés, forte isolation galvanique et faibles rayonnement électromagnétiques. Toutefois, les structures classiques sont basées sur la génération d’une onde stationnaire qui limite le nombre d’électrodes et de tensions disponibles en sortie. Dans cette thèse, nous proposons une nouvelle topologie de transformateur piézoélectrique qui utilise une onde progressive au lieu d’une onde stationnaire. Avec cette solution, il est possible d’obtenir un système polyphasé de tensions en sortie du transformateur ce qui rend possible plusieurs types de conversion (DC-DC, DC-AC à fréquence variable).Dans un premier temps, nous avons développé un nouveau modèle analytique permettant de décrire le comportement du transformateur à partir de ses dimensions et des propriétés du matériau. Différents prototypes ont été développés pour valider le concept du transformateur et des séries de mesures ont permis de valider le modèle. Concernant les performances, un transformateur cylindrique basé sur une onde de volume a pu fournir un système quadriphasé avec une puissance maximale de 6 W et des rendements de 90%.Une autre approche visait à décrire le comportement d’un transformateur déjà réalisé par l’extraction de ses paramètres Y. A partir de cela, une représentation compatible avec les logiciels de simulation de type Spice a permis une simulation précise du transformateur et du convertisseur de puissance associé.Enfin, deux convertisseurs de puissances ont été conçus basés sur ce transformateur à onde progressive. Le premier est un convertisseur DC-DC basé sur un redresseur polyphasé pour l’alimentation de drivers isolés. Les différentes tensions disponibles à la sortie permettent l’alimentation de plusieurs drivers avec un seul transformateur. Le second convertisseur est un convertisseur DC-AC basé sur le principe d’un cycloconvertisseur. La recombinaison des phases à la sortie permet d’obtenir un signal AC<br>Piezoelectric transformers propose several advantages over magnetic ones for power conversion : high voltage gain, compactness, high power density, high efficiency due to their high quality factor, strong galvanic isolation and low electro-magnetic emissions. However, in general, they are based on the generation of a standing wave that limits the number of electrodes at the surface of the transformer. In this PhD, we propose the use of a traveling wave instead of a standing wave. With this solution, it is possible to obtain a multi-phase system of voltages at the output which makes it suitable for different types of conversion (DC-DC, DC-AC with variable frequency).During this work, we developed a new analytical modelling of the transformer that describes its electrical behavior based on geometry and material properties. Different prototypes of TWPT were conceived to validate the concept and on which we perform measurements to validate the analytical modelling. Among them, cylinder-type TWTP based on longitudinal waves outputs a four-phase system with an output power of 6 W and efficiencies as high as 90%.A second approach developed consisted in the modelling of an already made transformer based on the experimental extraction of admittance parameters and its representation for simulation in Spice-type software. This approach allows for precise simulation of the transformer and the associated power converters.Finally, we designed two power converters based on this traveling wave piezoelectric transformers. The first one is a DC-DC converter that is based on a polyphase rectifier for isolated gate-drive power supply. The several phases available at the output allows for the generation of the supply for numerous drivers. The second one is a DC-AC converter similar to a matrix converter. The combination of the phases at the output of the TWPT allows for generation an AC signal at any frequency
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Books on the topic "Progressive waves"

1

Williams, JohnM. Tables of progressive gravity waves. Pitman Advanced Publishing Program, 1985.

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Mayumi, Shōji, ed. The mathematical theory of permanent progressive water-waves. World Scientific, 2001.

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United States. National Aeronautics and Space Administration., ed. The response of a laminar boundary layer in supersonic flow to small amplitude progressive waves. National Aeronautics and Space Administration, 1989.

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I, Hariharan S., and United States. National Aeronautics and Space Administration., eds. Progressive wave expansions and open boundary problems. National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1995.

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I, Hariharan S., and United States. National Aeronautics and Space Administration., eds. Progressive wave expansions and open boundary problems. National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1995.

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Dore, Ronald Philip. Incurable unemployment: A progressive disease of modern societies? Centre for Economic Performance, London School of Economics and Political Science, 1994.

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Davey, Paul. The Nationals: The Progressive, Country, and National Party in New South Wales 1919-2006. Federation Press, 2006.

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Zhang, Xuelin. Wage progression of less skilled workers in Canada: Evidence from the SLID (1993-1998). Publications review Committee, Analytical Studies Branch, Statistics Canada, 2002.

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Statistics Canada. Analytical Studies Branch. and Statistics Canada. Business and Labour Market Analysis Group., eds. Wage progression of less skilled workers in Canada: Evidence from the SLID (1993-1998). Analytical Studies Branch, Statistics Canada, 2002.

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Bhrolcháin, Máire Nı́. Period parity progression ratios and birth intervals in England & Wales, 1941-1971: A synthetic life table analysis. Centre for Population Studies, London School of Hygiene & Tropical Medicine, 1985.

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Book chapters on the topic "Progressive waves"

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Yeh, Harry H., and Kai-Meng Mok. "Experimental Facility for Progressive Edge Waves." In Water Wave Kinematics. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0531-3_45.

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Germain, J. P., and D. P. Renouard. "Long Progressive Waves in Rotating Fluid." In The Physical Oceanography of Sea Straits. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0677-8_20.

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Engelbrecht, J. "Second order Evolution Equations and Progressive Waves." In Nonlinear Hyperbolic Problems: Theoretical, Applied, and Computational Aspects. Vieweg+Teubner Verlag, 1993. http://dx.doi.org/10.1007/978-3-322-87871-7_24.

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Volansky, Ami. "The Decline of Progressive Education." In The Three Waves of Reform in the World of Education 1918 – 2018. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5771-0_4.

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Volansky, Ami. "Progressive Education in Selected Countries." In The Three Waves of Reform in the World of Education 1918 – 2018. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5771-0_3.

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Volansky, Ami. "The Emergence of Progressive Education." In The Three Waves of Reform in the World of Education 1918 – 2018. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5771-0_13.

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Volansky, Ami. "The Theory of Progressive Education." In The Three Waves of Reform in the World of Education 1918 – 2018. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5771-0_2.

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Chevalier, Yvon, and Jean Tuong Vinh. "Stationary and Progressive Waves in Rings and Hollow Cylinders." In Mechanical Characterization of Materials and Wave Dispersion. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118621264.ch13.

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Garceau, Patrick. "Characterization of Isotropic and Anisotropic Materials by Progressive Ultrasonic Waves." In Mechanics of Viscoelastic Materials and Wave Dispersion. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118623114.ch10.

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Sterian, Rodica, and Cristian Toma. "Simulating Laser Pulses by Practical Test Functions and Progressive Waves." In Computational Science and Its Applications – ICCSA 2005. Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11424857_64.

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Conference papers on the topic "Progressive waves"

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Yang, Ray-Yeng, Hwung-Hweng Hwung, and Igor V. Shugan. "Resonant Generation of Internal Waves on Two Muddy Sea Beds by a Progressive Surface Wave." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-80060.

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The present work is motivated by recent studies on the interaction between a progressive surface wave and the nearly standing subharmonic internal waves in a two-layer system. It is well known that the loading of progressive surface waves, a silty sediment bed was repeatedly and extensively fluidized. The great interest in understanding this phenomenon was induced by the practical applications in sediment transport, wave attenuation, and the design of marine structures. The nonlinear response of an initially flat sea bed, with two muddy sections, to a monochromatic surface progressive wave was investigated in the present study. Based on an analysis similar to that of Hill &amp; Foda’s (1998), the multiple scale perturbation method was adopted and the boundary value problem was expanded in a power series of the surface-wave steepness. The linear harmonics and the conditions for resonance were obtained by the leading order. While, the temporal evolution equations for the internal-wave amplitudes were investigated by a second-order analysis. It was found that result for equal density of two muddy sections is similar to that of Hill &amp; Foda’s (1998). Two opposite-traveling internal “mud” waves are selectively excited and formed a resonant triad with the progressive surface wave. However for a surface water wave progressing over two different muddy sections, the surface wave will also excite only two opposite-traveling short interfacial waves, forming a nearly standing wave at the interface of the fresh water and the muddy layer. Meanwhile, two opposite-outgoing “mud” waves each with very long wavelength will be simultaneously induced at the interface of two muddy sections. As a result, the amplitudes of the two short internal waves are found to grow exponentially in time. Furthermore, it will be much difficult to excite the internal waves when surface water wave progressing over two muddy sections with the large density gap.
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Coulouvrat, François, Alexandra Loubeau, Régis Marchiano, Bengt Enflo, Claes M. Hedberg, and Leif Kari. "Shock waves and absorption of general nonlinear progressive waves." In NONLINEAR ACOUSTICS - FUNDAMENTALS AND APPLICATIONS: 18th International Symposium on Nonlinear Acoustics - ISNA 18. AIP, 2008. http://dx.doi.org/10.1063/1.2956251.

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IWAMOTO, H., and N. TANAKA. "ACTIVE CONTROL OF PROGRESSIVE WAVES IN A RECTANGULAR CAVITY." In Euronoise 2009. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/17328.

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Elias, Renato N., Milton A. Gonc¸alves, Alvaro L. G. A. Coutinho, Paulo T. T. Esperanc¸a, Marcos A. D. Martins, and Marcos D. A. S. Ferreira. "Progressive Wave Simulation Using Stabilized Edge-Based Finite Element Methods." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79641.

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Flows involving waves and free-surfaces occur in several problems in hydrodynamics, such as sloshing in tanks, waves breaking in ships and motions of offshore platforms. The computation of such wave problems is challenging since the water/air interface (or free-surface) commonly present merging, fragmentation and cusps, leading to the use of interface capturing Arbitrary Lagrangian-Eulerian (ALE) approaches. In such methods the interface between the two fluids is captured by the use of a marking function which is transported in a flow field. In this work we simulate these problems with a 3D incompressible SUPG/PSPG parallel edge-based finite element flow solver associated to the Volume-of-Fluid (VOF) method [1]. The hyperbolic equation for the transport of the marking function is also solved by a fully implicit parallel edge-based SUPG finite element formulation. Global mass conservation is enforced adding or removing mass proportionally to the absolute value of the normal velocity at the interface. The performance and accuracy of the proposed solution method is tested in the simulation of progressive waves and the interaction of a fixed cylinder with a progressive wave.
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Kuprowicz, Nicholas J., John C. Petrykowski, and Paul W. Eloe. "Growth and Propagation of Acoustic Waves of Nonuniform Sound Speed Within a Plane-Walled Enclosure." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0527.

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Abstract The propagation of acoustic waves through nonuniform temperature fields may suffer distortion due to local sound speed variations. This paper considers the case of the generation and propagation of acoustic waves through a nonuniform temperature field where the spatial variations are caused by eddy current heating of a fluid layer. Numerical solutions to the variable coefficient inhomogeneous wave equation are presented for the case where the fluid is excited in the transverse direction and the adjoining walls are acoustically hard. Progressive and dispersive waves can be clearly distinguished in the numerical results with a dispersive wave speed value within 1.5% of theory. In addition, the progressive waves are shown to propagate along curved characteristics with the curvature being related to the severity of the sound speed gradient. Several eddy current heating applications are described in which propagation of acoustic waves is significantly altered by the nonuniform sound speed profile.
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Landry, Blake J., and Marcelo H. Garcia. "Bathymetric Evolution of a Sandy Bed under Transient Progressive Waves." In Sixth International Symposium on Coastal Engineering and Science of Coastal Sediment Process. American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/40926(239)172.

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Toue, Takao, Kazuo Nadaoka, and Hidehiro Katsui. "Asymmetric Boundary Layer Flow Above Sand Ripples Under Progressive Waves." In 25th International Conference on Coastal Engineering. American Society of Civil Engineers, 1997. http://dx.doi.org/10.1061/9780784402429.246.

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Battista, Thomas, Craig Woolsey, Leigh McCue-Weil, Eric Paterson, and Francis Valentinis. "Underwater vehicle depth and attitude regulation in plane progressive waves." In 2015 54th IEEE Conference on Decision and Control (CDC). IEEE, 2015. http://dx.doi.org/10.1109/cdc.2015.7402906.

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Lancioni, G., and S. Lenci. "On the Performances of High-Order Absorbing Boundary Conditions for Progressive and Standing Waves." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38132.

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The performances of three different high order absorbing boundary conditions (ABCs) are investigated in the case of progressive and standing waves in a dispersive one-dimensional medium. Their accuracy is first analyzed with respect to the frequency of a single incident wave. Then they are submitted to a wave train characterized by a wide frequency spectrum, resulting from an impulsive force. The influence of both the order and the parameters of the ABCs on the accuracy is analyzed in detail.
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Ülker, M. B. Can. "Instantaneous liquefaction in a multi-layer seabed under nonlinear progressive waves." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2012: International Conference of Numerical Analysis and Applied Mathematics. AIP, 2012. http://dx.doi.org/10.1063/1.4756444.

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Reports on the topic "Progressive waves"

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Torero, Máximo, and Jaime Saavedra-Chanduví. Labor Market Reforms and Their Impact on Formal Labor Demand and Job Market Turnover: The Case of Peru. Inter-American Development Bank, 2000. http://dx.doi.org/10.18235/0011243.

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This paper analyzes the effects of several aspects of labor legislation that were modified through successive waves of reform since 1991. Firing costs diminished sharply through the progressive elimination of job security regulations, the introduction of temporary contracts and changes in the severance payment structure. Simultaneously, non-wage labor costs increased. This paper assesses the effect of these changes on the level of formal employment, the effect of regulations changes on turnover, and compares employment duration data for the formal and informal sectors using empirical hazards and parametric estimations of hazard functions.
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Anderson, Dylan, Annika O'Dea, Jessamin Straub, et al. Evaluation of the Version 1 Advanced Tactical Awareness Kit–Expeditionary Radar (ATAK-ER) for accuracy and reliability in surf-zone characterization in a range of environmental conditions. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/48760.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) presents the evaluation of a rapidly deployable radar and associated software for characterizing surf-zone waves, currents, and bathymetries at the US Army Engineer Research and Development Center (ERDC), Coastal and Hydraulics Laboratory (CHL), Field Research Facility (FRF), in Duck, North Carolina. This project was conducted at the request of the US Marine Corps (USMC) Warfighting Laboratory. The Version 1 Advanced Tactical Awareness Kit–Radar Expeditionary (ATAK-ER V1) system was deployed 15 times between July and August 2023 to observe a range of wave, water level, and wind conditions that could each affect radar processing. Products from the system were then compared to the FRF’s continuously operating in situ instruments and monthly bathymetric surveys to quantify the accuracy and reliability of the output. A number of issues with the unit are identified, including potential error sources contributing to inaccuracies, but the black-box nature of the commercial off-the-shelf (COTS) unit prevents a confident understanding of why wave heights are underpredicted (by 65% on average), why bathymetries consistently have root-mean-square errors (RMSE) over 1 m with progressively greater errors with distance offshore, or why some collections are unable to generate all of the advertised products. This Version 1 COTS unit is not recommended for operational use at this time.
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Sossey-Alaoui, Khalid. WAVE3 is a Biomarker for Breast Cancer Progression and Metastasis. Defense Technical Information Center, 2013. http://dx.doi.org/10.21236/ada575854.

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Touhami, Abdelkhalek, and Dorothee Boccanfuso. Is the Moroccan Fiscal System Progressive ? A Shapley Decomposition. CIRANO, 2023. http://dx.doi.org/10.54932/wrzq6217.

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Public policies, particularly those related to tax policy and subsidies, should help reduce poverty and inequality. However, the combination of the components of these two systems, as implemented, leads sometimes to an increase in poverty and/or inequality without this being necessarily visible. In this paper, based on data from the 2019 wave of the ONDH Household Panel Survey from Morocco, we first highlight the ifluence of taxes and subsidies on household incomes. We then derive the income variations relating to the tax burden and gains from subsidies for the different population groups. We then characterize taxes and subsidies in terms of their progressiveness and regressiveness. Finally, using a Shapley decomposition, we determine the contribution of each tax and subsidy to poverty and inequality measures. This analysis is done separately for rural and urban areas, useful to formulate recommendations on this basis. Our results show that the tax and subsidy system, taken all together, is redistributive. We can also conclude unambiguously that this system reduces poverty and inequality. However, the value-added tax (VAT) is regressive in its current form, unlike income tax, which is progressive. Finally, subsidies for primary and secondary education are highly progressive, while those for higher education are regressive,benefiting the wealthiest quintiles.
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Park, Cyn-Young, Peter A. Petri, and Michael G. Plummer. Economic Implications of the Regional Comprehensive Economic Partnership for Asia and the Pacific. Asian Development Bank, 2021. http://dx.doi.org/10.22617/wps210371-2.

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The Regional Comprehensive Economic Partnership (RCEP) presents strong potential to mold regional trade and investment patterns well into the future and to influence the direction of global economic cooperation at a challenging time. This paper evaluates the RCEP’s impact on global and regional incomes, trade, economic structure, factor returns, and employment using a computable general equilibrium model. The results suggest that the RCEP agreement could generate sizable global income gains. Together with the Comprehensive and Progressive Agreement on Trans-Pacific Partnership, the RCEP will also strengthen the region’s manufacturing supply chains, raising productivity and increasing wages and employment.
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Fletcher, Daniel. HeppSY Uni Connect Outreach: Longitudinal Evaluation. Sheffield Hallam University, 2023. http://dx.doi.org/10.7190/steer/longitudinal.

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The Higher Education Progression Partnership South Yorkshire (HeppSY) is part of the Uni Connect Programme (UCP), funded by the Office for Students. The main focus of Uni Connect is to provide targeted higher education (HE) outreach to young people in Years 9 to 13 living in particular geographic areas. From August 2021 this broadened out to include the targeting of adult learners (learners aged 19 and above). HeppSY is working in partnership with Sheffield Hallam University, The University of Sheffield and South Yorkshire schools and colleges. To provide evidence for the impact of HeppSY outreach on outcomes relevant to HE access, a series of analyses were conducted matching together multiple waves of an annual student survey, HeppSY activity data, and student HE access data drawn from the Higher Education Statistics Agency (HESA). The results indicated that students who participated in more hours of outreach displayed greater increases in self-reported HE knowledge across survey waves, while evidence for an association between outreach engagement and increases in intention of applying to HE was mixed. Importantly, greater engagement in HeppSY outreach was associated with increased odds of accessing HE, and this relationship remained significant after controlling for baseline intentions of applying to HE.
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Barradas, Ricardo. Why are (financialised) workers becoming more resigned and conformist and less claimants? Empirical evidence for Portugal. DINÂMIA'CET-Iscte, 2023. http://dx.doi.org/10.15847/dinamiacet-iul.wp.2023.03.

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The deregulation and flexibilisation of labour relations has been on the active neoliberal agenda of policymakers all over the world, including in Portugal. Against this backdrop, labour conditions have been worsening since the 1970s and 1980s, and workers have progressively lost some labour rights, which is noticeable in stagnant (or falling) wages, the rise of personal income inequalities, the proliferation of atypical work, the increase of precariousness, the surge of emotional abuses in the workplace, the deterioration of work–life balance and the spread of informal work. Nonetheless, workers have evidenced higher resignation and conformism and lesser claimant behaviour in order to demand higher wages and better labour conditions, which is visible in the strong reduction in strike activity in the last four decades. Our argument asserts that workers’ financialisation and indebtedness levels restrain their demands for higher wages and better labour conditions due to the fear of decreasing their income and losing their jobs and the consequent risks of default. This paper aims to assess the relationship between workers’ financialisation and indebtedness levels and their strike activity by performing a time-series econometric analysis focused on Portugal during the period of 1979 to 2021. We conclude that workers’ financialisation and indebtedness levels have a negative effect on strike activity in Portugal, both in the short term and in the long term, especially on strike volume and strike duration. We also conclude that workers’ financialisation and indebtedness levels have been one of the main drivers behind the decline of strike activity in Portugal in the last four decades.
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Hastings, Bradley, Shayne Gary, Christopher Jackson, et al. Leadership Capability Framework for the Queensland Public Sector – Interim Evidence Review. Australia and New Zealand School of Government, 2024. http://dx.doi.org/10.54810/cvpc9985.

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ANZSOG is collaborating with the Queensland Public Service (QPS) and the Centre for Social Impact (CSI) at the University of New South Wales (UNSW) on a research project to address system-wide challenges of leadership development, including career transitions and generational transformation in the context of capability planning for the QPS. This interim evidence review compares leadership enablement approaches from across several jurisdictions, as well as gathering insights on QPS’s existing leadership foundations. It found that traditional leadership frameworks, such as the existing QPS framework, tend to outline a ‘one-size fits all’ pathway for leadership and describe a linear set of steps to progress up the leadership ladder. As an alternative, and a precursor for QPS, it presents a well-researched and developed framework (the Wallace 2D framework) which uses a relationship-focused leadership approach to provide better opportunities for all workers in QPS to thrive through progression up the leadership ladder.
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Ozturk, Ibrahim. On the Political Economy of Populism: The Decline of the Turkish Economy under Erdoğan’s Populist-Authoritarian Regime. European Center for Populism Studies (ECPS), 2022. http://dx.doi.org/10.55271/pp0008.

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Whether it adopts a right- or left-wing ideology or it is embraced as a belief or a set of ideals, and no matter the strategy or tactics, populism, in the final analysis, is a way of seizing power, and differences between the different strands carry significant repercussions. Many diverse economic, political, and cultural factors have been put forward to explain the rise of populism. One leader who has drawn increasing attention on the crest of the most recent wave of populism is Turkey’s incumbent president, Recep Tayyip Erdoğan. After a period of progressive and democratic leadership through to 2007, Erdoğan’s fundamental beliefs and personality surfaced, and the entire process was reversed, with devastating consequences for Turkey. This article argues that Erdoğan’s Islamist–nationalist populism has been one of the primary triggers of Turkey’s current political and economic meltdown. Moreover, his populist rhetoric has weakened Turkey’s already fragile autonomous institutions and paved the way for reform reversals and incoherent economic policy. Taken together, Erdoğanism has brought a woeful deterioration in macroeconomic indicators, including rampant inflation, mounting national debt, massive unemployment, rising poverty, and a profound currency shock.
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Rahmani, Mehran, Xintong Ji, and Sovann Reach Kiet. Damage Detection and Damage Localization in Bridges with Low-Density Instrumentations Using the Wave-Method: Application to a Shake-Table Tested Bridge. Mineta Transportation Institute, 2022. http://dx.doi.org/10.31979/mti.2022.2033.

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This study presents a major development to the wave method, a methodology used for structural identification and monitoring. The research team tested the method for use in structural damage detection and damage localization in bridges, the latter being a challenging task. The main goal was to assess capability of the improved method by applying it to a shake-table-tested prototype bridge with sparse instrumentation. The bridge was a 4-span reinforced concrete structure comprising two columns at each bent (6 columns total) and a flat slab. It was tested to failure using seven biaxial excitations at its base. Availability of a robust and verified method, which can work with sparse recording stations, can be valuable for detecting damage in bridges soon after an earthquake. The proposed method in this study includes estimating the shear (cS) and the longitudinal (cL) wave velocities by fitting an equivalent uniform Timoshenko beam model in impulse response functions of the recorded acceleration response. The identification algorithm is enhanced by adding the model’s damping ratio to the unknown parameters, as well as performing the identification for a range of initial values to avoid early convergence to a local minimum. Finally, the research team detect damage in the bridge columns by monitoring trends in the identified shear wave velocities from one damaging event to another. A comprehensive comparison between the reductions in shear wave velocities and the actual observed damages in the bridge columns is presented. The results revealed that the reduction of cS is generally consistent with the observed distribution and severity of damage during each biaxial motion. At bents 1 and 3, cS is consistently reduced with the progression of damage. The trends correctly detected the onset of damage at bent 1 during biaxial 3, and damage in bent 3 during biaxial 4. The most significant reduction was caused by the last two biaxial motions in bents 1 and 3, also consistent with the surveyed damage. In bent 2 (middle bent), the reduction trend in cS was relatively minor, correctly showing minor damage at this bent. Based on these findings, the team concluded that the enhanced wave method presented in this study was capable of detecting damage in the bridge and identifying the location of the most severe damage. The proposed methodology is a fast and inexpensive tool for real-time or near real-time damage detection and localization in similar bridges, especially those with sparsely deployed accelerometers.
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