Now showing items 53-72 of 79

    Finite element simulation of the healthy and degenerated lumbar spine : interplay between muscle activity and intervertebral disc multiphysics 

    Toumanidou, Themis (Date of defense: 2016-11-14)

    The human spine provides mechanical support to the trunk while it protects the spinal cord and nerves from the external loads transferred during daily activities. Such loads are largely controlled by the spine muscles and ...

    Fractal approach to wheel-rail roughness contact theory 

    Babici, Laura Mariana (Date of defense: 2023-12-21)

    (English) In this study, the Weierstrass fractal function was used to model the surface roughness of railway tracks and, subsequently, the static coefficient of friction (COF) for Hertzian rail-wheel contact and cylinder-plane ...

    Improved condition monitoring of hydraulic turbines based on artificial intelligence techniques 

    Zhao, Weiqiang (Date of defense: 2021-07-21)

    As a type of renewable energy that can provide rapid response to the requirement of the power grid, hydropower plays a fairly important position in the energy market. In recent years, with the enormous entrance of new ...

    Integración de conocimiento en la subcontratación estratégica de diseño de producto 

    Genovese, Pablo A. (Pablo Alberto) (Date of defense: 2013-09-03)

    La motivació d'aquesta tesi és entendre com pot ser gestionada la integració de coneixement en projectes de subcontractació estratègica de disseny de producte. Una participació activa de l'empresa durant la realització de ...

    Machine-learning to promote better practices of low-cost wearable devices in tremor diseases 

    Loaiza Duque, Julián David (Date of defense: 2023-10-27)

    (English) The most common tremor disorders worldwide are Parkinson's Disease and Essential Tremor. The gold standard for diagnosing these movement disorders is medical evaluation by neurologists, but its accuracy depends ...

    Mecanismes de lleves conjugades amb palpador de corrons. Aportació a l'estudi de la fallada per fatiga superficial 

    Català, Pau (Date of defense: 2014-05-06)

    This thesis presents the dynamic study of conjugate cam mechanisms with rollers follower and translational movement, to design them with the aim of retard the surface fatigue failure in the rollers. The premature failure ...

    Microfluidic platform for multiple parameters readouts in a point-of-care 

    Karimi, Shadi (Date of defense: 2020-05-11)

    The research is motivated by real applications, such as pasteurization plant, water networks and autonomous system, which each of them require a specific control system to provide proper management able to take into account ...

    Microfluidic platforms: from 3D printing to µPADs for chemical and biological applications 

    Mehrdel, Pouya (Date of defense: 2021-09-14)

    Over the past decade, microfluidic technology has proven its capabilities to start bringing detection and quantification capacities to novel miniaturized devices. The current generation of microfluidic platforms provide ...

    Minimisation of the wire position uncertainties of the new CERN vacuum wire scanner 

    Herranz Alvarez, Juan F. (Date of defense: 2016-02-29)

    The particle production of an accelerator is characterised by the accelerated species of particles, by their number and energy. The particle rate is determined by the production cross section, a natural constant and the ...

    Modelo estocástico de hueso cortical de costilla humana para la predicción de fracturas mediante emisión acústica 

    García Vilana, Silvia (Date of defense: 2021-02-04)

    In this document, a non-linear constitutive model with micro-cracking and irreversibility is proposed for cortical bone of the human rib, extended with a stochastic fracture model, based on acoustic emission. Both models ...

    Novel lubrication system to improve the excessive wear in wind turbine yaw and pitch gears 

    Farré Lladós, Josep (Date of defense: 2015-04-28)

    Manufacturers of wind turbines have observed a new phenomenon that appears in high power wind turbines: excessive wear in the teeth located at 0º in the pitch bearing. In order to design more efficient wind turbines, ...

    Numerical investigation and modelling of the unsteady behavior and erosion power of cloud cavitation 

    Geng, Linlin (Date of defense: 2021-01-28)

    Cloud cavitation is a unwanted phenomenon taking place in many hydraulic machines which damages the surfaces of the solid walls due to the erosive aggressiveness induced by the collapse process. Therefore, it is necessary ...

    Numerical tools for computational design of acoustic metamaterials 

    Roca Cazorla, David (Date of defense: 2020-09-07)

    The notion of metamaterials as artificially engineered structures designed to obtain specific material properties, typically unachievable in naturally occurring materials, has captured the attention of the scientific and ...

    Optimization of interplanetari trajectories with gravity assist 

    Torre Sangrà, David de la (Date of defense: 2020-07-28)

    Interplanetary travel is a difficult task due to the high fuel mass required to reach other planets. Minimizing the cost of the manoeuvres (and, in turn, the fuel mass) is the objective preliminary mission design. During ...

    Parametrització d'una bomba d'engranatges externs i validació en condicions reals 

    Torrent Gelmà, Miquel (Date of defense: 2023-03-31)

    (English) Pumps of positive volumetric displacement (PDVP) drive a volume of fluid from suction to discharge for each revolution of its shaft, called derived capacity, and therefore, in an ideal constant capacity pump the ...

    Passive acoustic method for aircraft localization 

    Martín Román, Sara-Regina (Date of defense: 2013-07-15)

    The present thesis investigates a passive acoustic method to locate maneuvering aircraft. The method is based on the acoustical Doppler effect, as a particular effect of the signals received by a mesh of spatially distributed ...

    Research on fluidic oscillators under incompressible and compressible flow conditions 

    Baghaei, Masoud (Date of defense: 2020-07-24)

    One of the main advantages of fluidic oscillators is that they do not have moving parts, which brings high reliability whenever being used in real applications. To use these devices in real applications, it is necessary ...

    Second life batteries of electric vehicles : analysis of use and management models 

    Rallo Tolós, Héctor (Date of defense: 2021-02-09)

    The mobility of the future undoubtedly involves the electrification of vehicles. The increase in social awareness towards a reduction in CO2 emissions, together with the introduction of new laws regulating them, has finally ...

    Solving the nearest rotation matrix problem in three and four dimensions with applications in robotics 

    Sarabandi, Soheil (Date of defense: 2021-04-27)

    Since the map from quaternions to rotation matrices is a 2-to-1 covering map, this map cannot be smoothly inverted. As a consequence, it is sometimes erroneously assumed that all inversions should necessarily contain ...

    Specific energy consumption of metal cutting with thin abrasive discs 

    Awan, Muhammad Rizwan (Date of defense: 2021-11-02)

    The aim of this research is to provide an in-depth understanding of energy consumption in abrasive disc cutting processes. The specific energy consumed in cutting is measured,analysed, and then characterised in to three ...