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 25 for “"planar structure"”.
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Low loss microwave power combiners/dividers
… a power combiner/divider that is both planar and low loss is required. The planar structure is a requirement if efficient heat dissipation is to be achieved. Cylindrical resonant cavity structures give very high combining efficiencies, however, they are non planar and have narrow …
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Visualization and simulation of defect structures in the B2 phase of NiAl
A methodology and infrastructure was established for the generation of images of embedded atom atomistic simulation data showing the deformed crystal lattice with one or more superimposed strain invariant fields. These methods were applied to data from simulations of B2 NiAl to study extended …
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The Dual Use of Power Distribution Networks for Data Communications in High Speed Integrated Circuits
… and wideband characteristics. Next, we study a planar structure IC package based on the cavity resonator model (CRM) as a communication channel. Impedance characteristics of a planar structure IC package and other relevant components of an IC are important, and they are investigated for data …
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Planar Packaging and Electrical Characterization of High Temperature SiC Power Electronic Devices
… as-received and packaged SiC power devices. The planar structure was introduced and developed as a substitution for traditional wire-bonding vertical structure. The planar structure was applied to a high temperature (>250oC) SiC power device. Based on the current-voltage (I-V) measurements, the …
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Tunable absorption and selective thermal emission from engineered metals with thin dielectric coatings
… In this thesis, we investigate a simple planar structure for achieving tunable, polarization- and angle-independent perfect absorption in the mid-infrared. Additionally, we demonstrate tunable selective thermal emission upon heating the device.
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Design of Active Structure Acoustic Control Systems Using Eigenassignment Approach
… to be an efficient practical approach to reduce structure-borne sound. ASAC works on the principles of reducing the vibration amplitude of the structure (modal reduction), as well as changing the vibration distributions of the structure so that the vibration distributions of each structural modes …
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Chip scale monolithic integration of inductive and capacitive components by self-rolled-up membrane nanotechnology
… monolithically into a single L-C network structure, thereby greatly reducing the on-chip area footprint. The individual L-C elements are fabricated in-plane using standard semiconductor processing techniques, and subsequently triggered by the built-in stress to self-assemble and roll into …
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Low-cost electromagnetic tagging : design and implementation
… is presented for multiply-resonant planar metal structures. This theory includes a circuit model, a phenomenological model, and a framework for predicting the resonant frequencies as a function of geometrical and material properties. A novel physical geometry, a tree-like spiral …
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Real-time dense simultaneous localization and mapping using monocular cameras
… between low-texture image regions and simple planar structure to adaptively scale the complexity of the generated keyframe depthmaps to the quality of the input imagery. High-texture image regions are represented at higher resolutions to capture fine detail, while low-texture regions are …
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Computational chemistry of organometallic and inorganic species
… studies, we have used DFT to identify structures of species observed in cyclic voltammetry. We have also studied the binding of a proton to similar systems and, through the calculation of chemical shifts and coupling constants, confirmed the structures of iron hydrides observed by 1H …
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Ultrafast excited state reaction dynamics in light-driven unidirectional rotary molecular motors and fluorescent protein chromophores
… decay. Substituents which distort the planar structure of the chromophore lead to an enhanced radiationless decay. This provides further evidence for a link between radiationless decay of the excited state and twisting of HBDI.
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Electron spin-lattice relaxation of cytochrome P-450 from Pseudomonas putida
… This hypothesis seems credible in view of the planar structure of the heme ring. For the high-spin species of substrate-bound P-450, relaxation rates were found to be Orbach-dominated down to temperatures of 1.5 K, with both excited states in the S = 25 manifold contributing to the relaxation …
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The synthesis and properties of some higher membered fused alicyclic ring systems
… produced, clearly indicating that the heptalene structure cannot be produced with the same facility as azulenes. Attempts to reach the heptalene structure by dibromination of methyl [0.5.5J-bicyclo-dodecatetraene carboxylate and the mild dehydrobromination with diethyl aniline failed to yield the …
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POLYMER–BASED RESONANT WAVEGUIDE GRATING STRUCTURE AND ITS APPLICATIONS
<p>Resonance waveguide grating structures have been a subject of interest for several decades. This optical technique offers unique advantages when compared with other optical components. This stems from their relatively simple structure comprised of layers, as well as their high reflection …
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Technoeconomic Assessment of a Gossamer, Planar, Gigawatt-Scale Space-Based Solar Power System
… the efficiency-to-areal-density ratio of the planar structure yet rigid enough to resist deformation. This thesis also recommends improving the efficiency-to-areal-density ratio of the RF signal generator and transmission antenna by leveraging miniaturization techniques to unify the two …
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Efficiency enhancement and degradation processes in CuxS/CdS thin film solar cells
An investigation has been made into the structure and properties of polycrystalline CuxS-CdS solar cells in order to develop an improved understanding of some of the processes which lead to unsatisfactory reproducibility and long term stability of the characteristics of these devices. The cells …
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Charge Carrier Balance in Lead Halide Perovskite Light Emitting Diodes
… high efficiency NIR ITO/ZnO/LHP/TFB/MoO3/Al planar structure, the charge efficiency or 𝜂𝐶𝐵 is 0.83-0.91 , consistent with the high observed EQE of 16-17%. Next a different hole transport layer poly-TPD is introduced and the device studied relative to the original TFB case. We find that …
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Substrate integrated waveguide antenna systems
Due to high demand for planar structures with low loss, a considerable amount of research has been done to the design of substrate integrated waveguide (SIW) components in the mm-wave and microwave range. SIW has many advantages in comparison to conventional waveguides and microstrip lines, such as …
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Planar groove gap waveguides
… in the design of tunable and reconfigurable planar devices. A planar medium to achieve this integration is the Substrate Integrated Waveguide (SIW). However, due to a lack of DC isolated planes of the structure, bridging wires or concentric etched rings are often used to enable active device …
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Wearable sensors networks for safety applications in industrial scenarios
… they mainly radiate perpendicularly to the planar structure, and their ground plane allows a good shielding on the body tissues. Therefore, I have designed specific antennas for RFID, that unlike the classical microstrip antennas have the radiating surface composed of several "side by side" …
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