Searched for: subject:"Screw"
(1 - 20 of 26)

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Swamy, A. (author)
The intraoperative guidance and placement of spinal screws is a complex procedure. High technical expertise is required fromthe surgeons in order to achieve adequate fixation and ensure patient safety by preventing vascular and neurological injuries. The conventional screw placement techniques face several challenges. Surgeons heavily rely on...
doctoral thesis 2021
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Losch, M.S. (author), Swamy, A. (author), Elmi-Terander, Adrian (author), Edström, Erik (author), Hendriks, B.H.W. (author), Dankelman, J. (author)
Background: The increased popularity of minimally invasive spinal surgery calls for a revision of guidance techniques to prevent injuries of nearby neural and vascular structures. Lipid content has previously been proposed as a distinguishing criterion for different bone tissues to provide guidance along the interface of cancellous and...
journal article 2021
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de Jong, J. J. (author), Müller, A. (author), Herder, J.L. (author)
Dynamic balance eliminates the fluctuating reaction forces and moments induced by high-speed robots that would otherwise cause undesired base vibrations, noise and accuracy loss. Many balancing procedures, such as the addition of counter-rotating inertia wheels, increase the complexity and motor torques. There exist, however, a small set of...
journal article 2021
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Rodiftsis, Athanasios (author)
When designing for structural performance, the geometry of the load-bearing elements is crucial for achieving the required stability. This is even more important in structural forms, such as shells and arches that are predominantly designed by their structural requirements. However, the typical design process starts with the design by the...
master thesis 2020
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Kothari, V.V. (author)
Decarbonisation can be done through various routes: reducing the final energy consumption by improving process conditions and efficiency, reusing waste heat and by an outright energy transition to renewable sources. In this study, the focus is on reusing waste heat. Heat pumps have the potential to drastically reduce energy requirements in the...
master thesis 2020
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Vermeulen, M.P. (author)
Within a great variety in high tech industry there is an increasing demand for complex shaped turning workpieces with diameters up to a meter and accuracy within microns. Examples are bearings in offshore wind energy and high precision applications. For the production of these parts CNC controlled turning machines are used. A motorized spindle...
master thesis 2020
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Scheeper, Tom (author)
According to the European Environment Agency (2016, pp. 137–140) annual mean river flow and the frequency of fluvial floods will have increased by 20% before the year 2100, in North-western Europe. It had been postulated in media in reports (De Ingenieur, 2014; „MIRT-verkenning Grevelingen”, 2012; Slootjes et al., 2010; Slootjes, 2013; Lammers,...
bachelor thesis 2020
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Hoevenaars, A.G.L. (author), Krut, S. (author), Herder, J.L. (author)
The dynamic performance of a parallel manipulator is often limited by its natural frequencies. These frequencies are a result of the controlled actuator stiffness and the mechanical design. Typically, only the lowest natural frequencies are of interest. However, existing methods to analyze natural frequencies of parallel manipulators with...
journal article 2020
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Gudjonsdottir, V. (author), Infante Ferreira, C.A. (author)
Heat pumps can efficiently upgrade waste heat from the industry and in that way reduce emissions. One of the main reasons why heat pumps are not applied to a greater extent in industry are large payback periods. Compression–resorption heat pumps (CRHP) enhanced by wet compression are considered a very promising option that can have higher...
journal article 2020
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Swamy, A. (author), Spliethoff, Jarich W. (author), Burström, Gustav (author), Babic, Drazenko (author), Reich, Christian (author), Groen, Joanneke (author), Edström, Erik (author), Elmi-Terander, Adrian (author), Racadio, John M. (author), Dankelman, J. (author), Hendriks, B.H.W. (author)
BACKGROUND: The safe and accurate placement of pedicle screws remains a critical step in open and minimally invasive spine surgery, emphasizing the need for intraoperative guidance techniques. Diffuse reflectance spectroscopy (DRS) is an optical sensing technology that may provide intraoperative guidance in pedicle screw placement. PURPOSE:...
journal article 2020
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van Erp, Stefan (author)
The goal of this research is to assess technical and economic feasibility of hydropower at the weir-complex of Driel. A local initiative opting to improve the environment gained interest in the idea and asked Arcadis NL for help. The weir complex at Driel lays in a key position in the Dutch river Delta and regulates the flow to the IJssel and...
master thesis 2019
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Gruijthuijsen, Dionne (author)
Energy consumption is still growing worldwide and due to the problems of global warming, sustainable developments become of more importance. Heat pumps are one of the technologies that can contribute to energy savings of industrial processes, for example by heat recovery from waste water streams. The focus of this research is to improve the...
master thesis 2019
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van Overstraten Kruijsse, Femke (author)
During construction in urban areas often noise and vibrations are not tolerated. For the installation of the foundation piles in these cases there is often chosen for screwed displacement piles. These piles can be installed without nuisance for the vicinity, but do induce large soil displacements during installation. The soil displacements can...
master thesis 2019
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Kwakkenbos, Jesse (author)
Coal silos are often used in areas where space is scarce, or because of environmental issues. Enclosed storage reduces the impact on the environment. If enclosed storage is used, different properties are important. The material characteristics can be split up in basic properties (moisture, angle of repose, etc.) and physical properties (shape,...
master thesis 2019
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Swamy, A. (author), Burström, Gustav (author), Spliethoff, Jarich W. (author), Babic, Drazenko (author), Reich, Christian (author), Groen, Joanneke (author), Edström, Erik (author), Terander, Adrian Elmi (author), Racadio, John M. (author), Dankelman, J. (author), Hendriks, B.H.W. (author)
Safe and accurate placement of screws remains a critical issue in open and minimally invasive spine surgery. We propose to use diffuse reflectance (DR) spectroscopy as a sensing technology at the tip of a surgical instrument to ensure a safe path of the instrument through the cancellous bone of the vertebrae. This approach could potentially...
journal article 2019
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de Jong, J.J. (author), van Dijk, J. (author), Herder, J.L. (author)
Fast-moving industrial robots exert large varying reaction forces and moments on their base frame, inducing vibrations, wear and accuracy degeneration. These shaking forces and moments can be eliminated by a specific design of the mass distribution of the robot links, resulting in a dynamically balanced mechanism. Obtaining the conditions for...
journal article 2019
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Gudjonsdottir, V. (author), Infante Ferreira, C.A. (author), Goethals, A. (author)
Compression-resorption heat pumps (CRHP) utilizing wet compression are a very promising option to upgrade waste heat from industry. CRHPs have the potential to have higher coefficient of performance (COP) than the traditionally used vapour-compression heat pumps (VCHP). However, commercial solutions utilizing wet compression are not available...
journal article 2019
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Hofman, Leander (author)
This thesis describes the process of redesigning the 3D-paintbrush. It looks into extruder screws for plastics and finds the best design variables for the 3D-paintbrush. Vortex cooling has been used to cool the extruded plastics fast and efficient. With the findings for melting and cooling the thesis looks at human-machine interaction and...
master thesis 2018
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Guđmundsdóttir, Kristin (author)
The main objective of this study was to develop a quick model for an oil free twin screw compressor. The computational time of the model was to be kept as low as possible so that the model could be used for quick estimations and optimizations of the process. This was done by using a simple geometry focusing on the volume curve and port sizes,...
master thesis 2018
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Heijmink, Elco (author)
Rotational electric actuators are the most popular choice for actuation in modern day automation. These actuators are commonly used in combination with a transmission system. In this paper, the development of a new rotational to linear transmission technology, called the ring screw, is described, and its real-world performance is evaluated...
master thesis 2018
Searched for: subject:"Screw"
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