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THE ACOUSTIC PROPERTIES OF SOLIDS

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2 theses in 1 pages: 1
  • INVERSE DESIGN OF NANOSCALED PHOTONIC DEVICES
    Author: HÒKANSSON OLA ANDREAS.
    Year: 2005.
    University: POLITÉCNICA DE VALENCIA [www.upv.es].
    Place of defense: Dep. Ingenieria Electronica.
    Place of preparation: Universidad Politécnica de Valencia.
    Summary: The objective of this paper is to introduce a new approach to the design of fully automated components fotónicos nanostructured including full inspection of the scattered light. This objective has been achieved with the development of a design tool reverse, which has been obtained through the combination of an electro-magnetic simulator of the problem based on the theory of multiple scattering and a stochastic optimization method based on algorítmos genetic. The software was written in Fortran 90 and can run in both Windows and Linux platforms. The effectiveness of the design tool has been demonstrated by generating a series of devices that meet the constraints of proven technology manufacturing and assembling; sheet glass fotónico and technical micro-manipulación respectively. Partners technique micro-manipulación, a new family of optical elements, the so-called "optical scattering elements" (SOE), has been introduced. Specifically, the devices have been designed: lenses, dividers wavelength, waveguide couplers, collimators and photonic cavities, which show promising new features. It has also been shown that it can provide a single device several functionalities using the same method of reverse design. Finally, experimental results have been obtained in the field of dispersion acoustic waves which confirm the high quality of the design tool. Several prototypes of acoustic lenses and dividers wavelength, very similar to SOE designs have been manufactured and the characterization of its acoustic properties has confirmed those prefixed in the design.
  • EVALUATION OF BRIDGES ACOUSTIC PARTITIONS LIGHT MULTILAYER
    Author: BRAVO PLANA-SALA JOSE MARIA.
    Year: 2005.
    University: POLITÉCNICA DE VALENCIA [www.upv.es].
    Place of defense: Dep. Fisica Aplicada.
    Place of preparation: Universidad Politécnica de Valencia.
    Summary: In this paper, we propose a method of theoretical prediction of dwindling noise reduction fences in light bridges affected by noise. This builds on the work done to study this phenomenon, associated with circular holes focused on the central area of the surface of the enclosure, Wilson and SoroKa and labor Gomperts in the case of fissures perimeter. The paper seeks to adapt these theoretical models, developed under the boundary conditions of a single enclosure or monolithic, a lightweight enclosure. It examines the impact of the distance between holes circular made on both sides of these fences, paying particular attention to the variation in the fall of isolation by the fact that the holes are ennfrentados or separated at different distances. As for the cracks perimeter, we studied the influence of the length and depth of the crack. It performs a check pilot to verify the theoretical predictions.
2 theses in 1 pages: 1
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