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van der Plaats, Lisa (author)The quality of rigid endoscopes deteriorates during clinical use due to the sterilization process, mechanical forces and wear and tear during regular use. Regulations and standards on ensuring the quality of these instruments are currently non-existent or contain only qualitative measures, resulting in subjective examinations . Defective rigid...master thesis 2019
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Naaborg, Jeroen (author)The Flex-to-Rigid (F2R) technology platform is an interconnect platform to integrate heterogeneous electronic systems and devices onto a partially flexible chip for minimally invasive medical instruments. This technology platform allows for the integration of micro electro-mechanical systems (MEMS) and integrated circuits (IC) on a chip in a...master thesis 2019
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Zazueta Martinez, Isis (author)Vortex-induced vibration or as well-known as VIV is a phenomenon that has caught the attention of engineers along history. VIV is related to many engineering fields. In the offshore industry, it is of importance for risers that extract oil from the subsoil, and tethered anchors for floating units.<br/>The main aim of the thesis is to model the...master thesis 2019
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Merkel, Matthias (author), Baumgarten, K. (author), Tighe, B.P. (author), Manning, M. Lisa (author)We present an approach to understand geometric-incompatibility–induced rigidity in underconstrained materials, including subisostatic 2D spring networks and 2D and 3D vertex models for dense biological tissues. We show that in all these models a geometric criterion, represented by a minimal length ℓ¯min, determines the onset of prestresses and...journal article 2019
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Mohammadzadeh Moghaddam, E. (author), Foumeny, E. A. (author), Stankiewicz, A.I. (author), Padding, J.T. (author)Despite the substantial simplicities inherent in pseudo-continuum models of fixed bed reactors, there is a continued interest in the use of such models for predicting fluid flow and transport scalars. In this paper, we aim to quantitatively address the inadequacy of 2D pseudo-continuum models for narrow-tube fixed beds. We show this by...journal article 2019
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van Zandwijk, Jan Peter (author), Vester, Marloes E.M. (author), Bilo, Rob A. (author), van Rijn, Rick R. (author), Loeve, A.J. (author)Various types of complex biomechanical models have been published in the literature to better understand processes related to inflicted head injury by shaking trauma (IHI-ST) in infants. In this systematic review, a comprehensive overview of these models is provided. A systematic review was performed in MEDLINE and Scopus for articles using...review 2019
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Kroon, Erik (author)A new field of study has arisen within Wind Energy known as ‘Airborne Wind Energy’ (AWE). Although the concept of AWE has been around for a long time, there has been little development in this field until recently. This thesis adds to this development.<br/><br/>The focus lies on airfoil design in order to improve existing AWE systems and...master thesis 2018
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Versteijlen, W.G. (author)Offshore wind generated electricity is currently one of the most promising sources of energy to contribute in creating a sustainable global energy mix. The latter is essential for minimising the detrimental impact of human-induced accelerated climate change. The cost of offshore wind power has strongly decreased over the past years due to ...doctoral thesis 2018
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van Koppenhagen, Guido (author)A proposed future mode of mass transit is the hyperloop system, in which magnetically levitating passenger pods travel at high speed through a tube held at low pressure. This thesis will investigate the dynamics of such a system, and determine the influence of various parameters on the dynamic response of the system. The tube has been modelled...master thesis 2018
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Rodichev, Yurii (author), Veer, F.A. (author), Strizhalo, Vladimir (author), Soroka, Elena (author), Shabetia, Alexander (author)The subject area "structural strength of materials" is defined generally as а complex of strength characteristics of materials and structural elements, obtained under special mechanical tests. It is shown that these tests should take into account not only the physical and mechanical properties of the material, but technology, blank processing,...conference paper 2018
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Bhosale, P.S. (author), Staring, M. (author), Al-Ars, Z. (author), Berendsen, Floris F. (author)Currently, non-rigid image registration algorithms are too computationally intensive to use in time-critical applications. Existing implementations that focus on speed typically address this by either parallelization on GPU-hardware, or by introducing methodically novel techniques into CPU-oriented algorithms. Stochastic gradient descent (SGD...conference paper 2018
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Sajadi, B. (author), van Hemert, Simon (author), Arash, B. (author), Belardinelli, P. (author), Steeneken, P.G. (author), Alijani, F. (author)The bending rigidity of two-dimensional (2D) materials is a key parameter for understanding the mechanics of 2D NEMS devices. The apparent bending rigidity of graphene membranes at macroscopic scale differs from theoretical predictions at micro-scale. This difference is believed to originate from thermally induced dynamic ripples in these...journal article 2018
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Li, Z. (author), Jiang, X. (author), Hopman, J.J. (author)Fatigue is one of the major challenges of offshore rigid pipes. The surface crack is the main manifestation. Fatigue cracks are evolved from surface cracks which are frequently appear in the external surface of rigid pipes. Under fatigue loads, the surface cracks may continue to propagate and finally develop into penetrated cracks, which may...conference paper 2018
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Hart, K.P. (author), van Mill, J. (author)The classical Erdös spaces are obtained as the subspaces of real sep- arable Hilbert space consisting of the points with all coordinates rational or all coordinates irrational, respectively. One can create variations by specifying in which set each coordinate is allowed to vary. We investigate the homogeneity of the resulting subspaces. Our...journal article 2018
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Versteijlen, W.G. (author), Renting, F.W. (author), van der Valk, P. L.C. (author), Bongers, J. (author), van Dalen, K.N. (author), Metrikine, A. (author)In an attempt to decrease the modelling uncertainty associated with the soil-structure interaction of large-diameter monopile foundations, a hydraulic shaker was used to excite a real-sized, in-situ monopile foundation in stiff, sandy soil in a near-shore wind farm. The response in terms of natural frequency and damping of a pile-only system...journal article 2017
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Smit, Thijs (author)Origami has become a source of inspiration in engineering for structural design and the creation of mechanical metamaterials. In the often used analytic geometric and energy methods, it is difficult to incorporate deformation of the faces in non-rigid origami. However, deformation of the faces can play a significant role in their mechanical...master thesis 2017
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Moerkerken, T. (author)Pre-operative planning aids clinicians by providing insight into patient-specific problems before surgery is performed. For treatment of femoroacetabular impingement (FAI), a range of motion (ROM) simulation is used, based on collision detection on segmented CT or MRI-data. Imaging data of the femur is often incomplete, due to the fact that...master thesis 2017
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- Sitanggang, A.P.B. (author) master thesis 2017
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Versteijlen, W.G. (author), Renting, F.W. (author), Valk, van der, P.L.C. (author), Bongers, J. (author), van Dalen, K.N. (author), Metrikine, A. (author)It is widely accepted that the initial stiffness derived with the p-y methodology as prescribed by the American Petroleum Institute does not capture the true small-strain stiffness for rigidly behaving piles. We present an alternative method, capturing the 3D effects in the soil-pile interaction, in which the soil is characterized with in-situ...journal article 2017
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Abramian, A. (author), van Horssen, W.T. (author), Vakulenko, SA (author)The dynamics of a string on an elastic foundation with time- and coordinate-dependent coefficients have been studied. Asymptotic solutions have been constructed for the following cases: for an arbitrary value of the elastic foundation coefficient at small and large time values, and for small and large coefficients of the elastic foundation at...journal article 2017