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 33 for “"Impedance Mismatch"”.
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Effective use of Java Data objects in developing database applications. Advantages and disadvantages
… disadvantage of this approach is the well-known "impedance mismatch" in which some form of mapping is required to connect the objects in the frontend and the relational tuples in the backend. Java Data Objects (JDO) technology is recently proposed Java API that eliminates the impedance mismatch. …
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All Pass Readout With Ring Resonators for Qubit Measurement
… in the readout signal. However, this impedance mismatch creates problems with resonator linewidth variation, standing waves, and voltage nodes in the feedline, leading to challenges in scaling to larger frequency multiplexed systems. This thesis proposes an all-pass readout scheme that …
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A numerical method for solving for normal modes with impedance bottom
… the water, the frequency of the source, and the impedance and sound speed in the bottom. The program does this by computing the sum of normal modes for a specified set of boundary conditions. At the surface perfect pressure release is assumed, and the boundary condition at the bottom is one of …
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Non-contact ultrasound
… challenging for ultrasound due to the high impedance mismatch between bone and soft-tissue in the imaging domain. New imaging algorithms are necessary for both geometric and quantitative reconstruction of subjects with bone. Multiple immersion systems were designed and constructed using the …
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Power line communications systems
… required to determine noise characteristics and impedance mismatch in the power line network before it can be completely modeled.
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Electromagnetic modeling of terahertz quantum cascade laser waveguides and resonators
… that both the effective index method and the impedance mismatch method are poor methods in calculating mirror reflectivities for metal-metal waveguides in the THz region. The effective index method is shown to still be valid for SI surface-plasmon waveguides. In addition, simulated radiation …
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Absolute Flux Density Measurement and Associated Instrumentation for Radio Astronomy below 100 MHz
… on the front end create large, frequency varying impedance mismatch that must be accounted for, and we demonstrate how this can be done. We present a novel in situ technique that uses the antenna temperature measurements to improve the calibration of the antennas and internal noise sources.
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Design and Analysis of a Cylindrical Dielectric Resonator Antenna Array and Its Feed Network
… is also considered. The primary causes of impedance mismatch in the feed network are identified and techniques to improve performance are explored. An improvement in impedance bandwidth is gained through traditional transmission line matching methods. Ultimately, a 16 (4x4) element and 256 …
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Investigation of electrically tunable diode-based nonlinear transmission lines as pulse shaping networks for microwave systems at megawatt peak powers
… of the C(V) curve, reducing the level of impedance mismatch at the source-line interface. This resulted in a measured center frequency of 263 MHz, accompanied by an in-network amplitude of 8 V generated from a 10 V peak-to-peak square wave. Comparison with an unbiased D-NLTL, subjected to …
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Objektinių ir reliacinių duomenų bazių taikymas objektiškai orientuoto programavimo kontekste /
… two problems relevant today. First problem is impedance mismatch of relational databases and object oriented programming languages. Second – database usage in agile software development process environment. In order to define application area of object and relational databases it was decided to …
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Tentacle : a graph-based database system
… the graph structures, thereby eliminating the impedance mismatch encountered in a two language system, and provides a programmable database kernel capable of executing the combined query and utility language, allowing the construction of domain specific applications inside the database without …
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Study of sound attenuation in elliptic ducts
… ports from the chamber dimensions presents an impedance mismatch to the propagating acoustic wave, resulting in partial or complete reflection of the sound energy. Mufflers can broadly be classified as reactive type or dissipative type. Reactive mufflers employ the principle of impedance …
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Dielectric measurement based microstrip transmission line
… materials. A microstrip line having impedance other than 50 Ω is designed and material under test is used as the substrate. The impedance mismatch between a non-50 Ω characteristic impedance of the microstrip line and 50 Ω coaxial to microstrip connectors generates significant …
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Magnetic and Thermal Design of Litzwire 500 kHz Highpower Planar Transformers with Converging Cooling Duct for “dc Transformer” Resonant Converter Applications
… with the lowest leakage inductance results in an impedance mismatch among parallel secondaries used in the majority power path transformer, resulting in poor current sharing. In order to balance the goals of leakage inductance minimization and even current sharing, a new winding technique called …
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Acoustic prediction and noise control of a refrigeration compressor
… between the mounts and the springs to create an impedance mismatch. For all three approaches, efficient analytical methods to compute the radiated acoustic power upon the system modifications are developed. The most promising approach is the insertion of the low modulus materials, which yields a …
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Measurement and Analysis of High Frequency Resonances In Printed Circuit Boards
… transmission line discontinuities, trace impedance mismatch/mixed mode propagation, vias, periodic materials, contaminant resonant absorption, and water/moisture.</p>
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Analysis of Highly Coupled Wideband Antenna Arrays Using Scattering Parameter Network Models
… arrays as well as their radiation efficiency and impedance mismatch. Using the network model, the relationship between radiation pattern characteristics and the input impedance characteristics of the array antennas becomes clear. Three types of source impedance matching conditions for array …
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Novel Bioinspired Pumping Models for Microscale Flow Transport
… that is neither peristaltic nor belongs to impedance mismatch class of pumping mechanisms. The insect-inspired pumping models presented here are expected to function efficiently in the microscale flow regime in a simple channel/tube geometries or a complex network of channels. The first …
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Acoustic Radiation Force on a Fluid to Fluid Boundary by Phase Plate Focused Ultrasound
… oil and water was investigated. Due to the impedance mismatch at the boundary significant heating occurred when it was insonified causing a decrease in the surface tension over time. When the surface tension is low enough, jetting of the oil into the water occurs. The findings in this work …
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Advancements in the Split Hopkinson Bar Test
… results, including longitudinal wave dispersion, impedance mismatch of the bars with the specimens, and transducer properties, among others. A particular area of advancement is a new technique to determine the bars dispersive nature, and hence reducing the distorting effects. By implementing …
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