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 20 of 35 for “"lumped-element"”.
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Time-domain based steady-state initialization for the EMTP
… yields a simple, efficient solution for linear, lumped element networks. However, the basic algorithm cannot be easily extended to handle nonlinear and variable structure networks. A time-domain based steady-state initialization algorithm is formulated for the three classes of lumped element …
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The Search for High-Frequency Gravitational Waves with a Modified Axion Detector
ABRACADABRA-10cm has had great success as a lumped-element axion dark matter pathfinder experiment, with two published axion searches and an extensive background investigation. Now, using the electrodynamics of gravitational waves and a simple change of pickup structures, we are using the …
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Flow optimization of ventricular catheters for shear stress-induced death of astrocytes
… proposes a novel design scheme developed on a lumped-element model describing the fluid dynamics of ventricular catheters. The thesis conducted long-term in vitro microfluidic culture of astrocytes and showed that fluid shear stress inhibits astrocytes from increasing confluency and reduces …
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Investigation of Scaling Effects for a Synthetic Jet Actuator Using High and Low Fidelity Analyses
… synthetic jet actuators using Ansys-CFX and a Lumped Element Model (LEM). Synthetic jets or zero net mass-flux devices use a vibrating diaphragm to generate an oscillatory flow through a small orifice. A synthetic jet actuator can be used on MAVs as thrust generator or fixed on an airfoil for …
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UHF RFID Antenna Impedance Matching Techniques
… and broadband (±5% of center frequency) lumped element designs also use inductive matching strips. Narrowband, lumped element design is accomplished through Smith Chart matching assuming lumped antenna elements. The broadband lumped element design is accomplished through a circuit …
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Small -Signal Distributed FET Modeling
… performance is compared with that of a standard lumped-element model. Skin effect in the gate conductor is analyzed. High-frequency measurement issues are also discussed.
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Power line communications systems
… three core indoor cable is modeled as a two wire lumped-element model with distributed parameters. These parameters are capacitance, inductance, conductance and resistance.The predicted results, generated by MATLAB software closely matched those obtained by the measurements carried out on the 10m …
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Effects of statistical variations on propagation of electromagnetic waves in disordered periodic structures
… variations in material parameters and lumped-element values on the transmission properties of transmission-line based metamaterial structures. The theory yields closed-form expressions for the calculation of the propagation constant of the disordered structure that are shown to provide …
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Hydrodynamics of a multiple tidal inlet system : Katama Bay, Martha’s Vineyard, MA
… friction, tidal forcing) are quantified via a lumped element model that accounts for the presence of a shallow flood shoal that limits flow from the ocean into the bay. As the difference in depth between inlet and flood shoal increases, the amplitude and phase of the incoming tide are …
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Hydrodynamics of a multiple tidal inlet system : Katama Bay, Martha's Vineyard, MA
… friction, tidal forcing) are quantified via a lumped element model that accounts for the presence of a shallow flood shoal that limits flow from the ocean into the bay. As the difference in depth between inlet and flood shoal increases, the amplitude and phase of the incoming tide are …
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Distributed photomixers
… and avoids the RC rolloff associated with a lumped-element photomixer's intrinsic capacitance and the load resistance. The distributed photomixer structure consists of coplanar strips (CPS) fabricated on top of a dielectric strip-loaded waveguide that guides the optical beat.
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Practical realisation of multiband planar filters on multilayer substrates
… filters representation and wide-band with quasi-lumped element filters representation of up to quad-bands based on reactance transform method are undertaken. With the emphasis on practical aspects such as losses and selectivity, which are related to the physical implementation on multi-layer …
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Design, fabrication, and testing of a MEMS z-axis Directional Piezoelectric Microphone
… suspended on compliant silicon springs. Finite element analysis and lumped element modeling have been performed to aid in structural design and device verification. The proposed microphone was successfully fabricated in a cleanroom facility at The University of Texas at Austin. Testing …
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Modeling wireless acoustic power transmission systems
… Such representations can be also be expressed in lumped-element circuits, which can be useful in designing the electrical end of the power transfer system. Using ABCD-parameter models, multiple acoustical and piezoelectric elements are cascaded and modeled as a single two-port network. Using …
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Radiofrequency losses in an NMR surface coil
… RF losses in coils designed using conventional lumped-element principles, however, often limit the practicality of high-field imaging. New design principles are required for the construction of efficient high-field RF coils. The RF energy losses investigated include RF coil losses and losses to …
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The First Laboratory Searches for Low-Mass Axion Dark Matter
… low-mass axion dark matter, using an innovative lumped-element detection method. In a lumped-element detector, a strong magnetic field interacts with the field of dark matter axions around us, inducing an effective current. This effective current is read out via a superconducting LC circuit and …
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Tunable microwave filters using ferroelectric thin films
… and 25 GHz are designed, tested and analysed. A lumped element lowpass filter incorporating integrated meander line inductors and BST parallel plate capacitors is implemented on a high resistivity silicon substrate and demonstrates 32.1 % tuning of the cut-off frequency at 15 V. A combline …
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Reconfigurable tunable microwave devices using liquid crystal.
… from full-wave electromagnetic simulations, lumped-element circuit models and prototype measurements in all cases indicate around 3.1 to 8.2% of continuous frequency tuning with low insertion loss (< 1 dB). Given that liquid crystals material are transparent, commercially obtainable and are …
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The limits of Brune's impedance
… sufficient condition for network synthesis using lumped elements. Brune's impedance, described using a ratio of polynomials, represents a fundamentally limited subset of impedance functions. Quite notably, all lumped-element networks do not support wave propagation. Two classes of impedances …
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A computational tool for microstrip planar filter design
… design procedures through this tool start from lumped elements filter up to Microstrip filter. The user just needs to insert the required filter specifications and the design’s material description then all the required results will be displayed including lumped element filter along with …
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