Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Magnetic actuation"”.
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Understanding and development of combined acoustic and magnetic actuation of Ni₂MnGa single crystals
Ni-Mn-Ga based ferromagnetic shape memory alloys (FSMAs) have emerged as a promising new class of active materials capable of producing a large (several %) magnetic-field-induced strain (MFIS). FSMAs still have several characteristic shortcomings that may limit their potential applications. A …
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Printing ferromagnetic domains in soft materials : mechanism, modeling, and applications
… This thesis introduces a method of printing ferromagnetic domains in soft materials that yield fast transformation between complex 3D shapes via magnetic actuation. This approach is based on direct ink writing of an elastomer composite containing hard ferromagnetic microparticles. By applying a …
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Directed transport of superparamagnetic microbeads using periodic magnetically textured substrates
Superparamagnetic microbeads (SPBs) have been widely used to capture and manipulate biological entities in a fluid environment. Chip-based magnetic actuation provides a means to transport SPBs in lab-on-a-chip technologies. This is usually accomplished using the stray magnetic field from patterned …
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TECHNOLOGY COMMERCIALIZATION AND FEASIBILITY ANALYSIS OF DEVICE FOR ADJUSTING SPINAL IMPLANTS FOR THE TREATMENT OF EARLY-ONSET PEDIATRIC SCOLIOSIS
… adjust the spinal implants through magnetic actuation from outside the body. The thesis will focus on the technology commercialization and feasibility analysis of Apto Orthopaedic device for non-invasively adjusting the spinal implants for the treatment of early-onset pediatric …
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The mechanical and magnetic behaviour of sintered fibre networks and their suitability for a therapeutic, biomedical application
… of therapeutic, biomedical engineering is the magnetic-mechanical stimulation of bone growth around prosthetic implants after joint replacement surgery. The loosening of prosthetic implants in the human bone is one of the current research topics of prosthesis design. **Objectives and …
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Origami nanofabrication of three-dimensional electrochemical energy storage devices
… use of SU-8 membranes and elastic gold hinges. Magnetic actuation, stress-induced folding, vertical spacing, and lateral alignment of the membranes are discussed. This thesis also reports on the used of the Nanostructured OrigamiTM process to create a functional electrochemical energy storage …
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Pulse-field actuation of collinear magnetic single crystals
Ferromagnetic shape memory alloys (FSMAs) are a class of alloys that exhibits the shape memory effect, as in the alloy nickel-titanium, sometimes known as Nitinol. In FSMAs, though, the shape changes are not brought on just by changes in temperature or mechanical stresses, but can also be driven by …
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Design and characterization of acoustic pulse shape memory alloy actuators
Single crystal Ni-Mn-Ga ferromagnetic shape memory alloys (FSMAs) are active materials which produce strain when a magnetic field is applied. The large saturation strain (6%) of Ni-Mn-Ga, and material energy density comparable to piezoelectric ceramics make Ni- Mn-Ga an interesting active material. …
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Light and nanoparticle-based approaches to the control of ion channels and drug delivery
… the use of both photosensitizer-coupled and magnetic nanoparticles as actuators of ion channels. While direct magnetic actuation was not found to promote activation of the receptors tested, several members of the transient receptor potential superfamily (TRP), notably TRPV3 and TRPA1, were …
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Ensemble control of robotic systems
… manipulator is a planar motion stage that uses magnetic actuation to orient a sphere of unknown radius. We conclude by showing how the same framework can be applied to feedback control of multi-robot systems under the constraint that every robot receives exactly the same control input. We focus …
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Modelling and Simulation of the Nonlinear Dynamics of Arrays of Coupled Filaments for Robot Walkers
… they often focus on hydrodynamic coupling or magnetic actuation. This thesis introduces a model with mechanical coupling. The main objective of the thesis is to derive a mechanical model and to simulate it, creating the foundation for the systematic prediction of the emergence of coordinated …
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Design and analysis of non-threaded drill pipe connector.
… loads from operational use as well as possessing magnetic properties to enable actuation of the rings. Finite Element Analysis (FEA) was conducted using the ANSYS Workbench software package to identify the maximum stress and deformation behaviors for the Snap-Latch Ring prototypes that were …
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Tethered Magnetic Serial Robots for Minimally Invasive Neurosurgery
… power transfer capabilities of low-frequency magnetic fields make them an attractive option for actuating devices on the nanometer scale up to the centimeter scale, enabling a new suite of minimally-invasive techniques for a wide variety of medical procedures. There is a significant demand for …
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Funkční mikrorobotické systémy
… studujeme kolektivní chování povrchově funkčních magnetických mikrorobotů k zachycování volně plovoucích bakterií a mikroplastů za působení vnějších magnetických polí. Poté, co tuto kapitolu uzavřeme diskusí o klíčových výzvách směřujících k využití mikrorobotů pro sanaci vody, představíme …
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Fundamentals of heat transfer and thermal-mechanical control for improved atomic force microscopy
… of two heated cantilevers designed for electromagnetic Lorentz force actuation. Electrical current passing through a U-shaped cantilever in the presence of a magnetic field induces a Lorentz force on the cantilever free end, resulting in cantilever actuation. These Lorentz-thermal cantilevers …
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Biophysics of Helices: Devices, Bacteria and Viruses
… achieve propulsion at the microscale level using magnetically actuated, rotating helical filaments. A promising application of these artificial microswimmers is in non-invasive medicine, for drug delivery to tumours or microsurgery. Two crucial features need to be addressed in the design of …