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 20 for “"electrical excitation"”.
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Hardware implementation for cardiac electrical excitation and conduction using an FPGA
Contraction of the heart is controlled by electrical excitations of cardiac cell membranes. The electrical excitations of the cells and their propagation in the heart tissue provide a basis of the physiological function of the heart through the cardiac excitation-conduction mechanism. One way to …
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Electrical excitation of colloidally synthesized quantum dots in metal oxide structures
… oxide based QD-LEDs to study mechanisms for electrical excitation of QDs. QD-LEDs have generated considerable interest for applications such as thin film displays with improved color saturation and white lighting with high color rendering index. This work demonstrates that air-stable metal …
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Electroluminescence characterization of organometallic perovskite solar cells
… account ionic motion in the perovskite under electrical excitation. The implication of these results is also discussed in the context of the utility of EL characterziation for perovskite PVs.
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Investigation of Ferroelectric Thin Film Using Piezoresponse Force Microscopy
… certain defects are controllable via an external electrical excitation and the strain associated with the defect can also be controlled. Lastly, ways to modify the thin film geometry with focused ion beam milling and broad beam milling and its impact on domain configurations is studied. The …
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Multimodal Soft Sensor Design through Single-Material Information Structuring
… be structured through material, morphology, and electrical excitation co-design. The effects of each are experimentally explored, with the ultimate goal of single-material soft multimodal sensor fabrication. Their outputs are analysed through the learning-based processing of large …
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High pulse repetition frequency XeCl laser and its applications
… produces a maximum flow velocity of 40m.s⁻¹. Electrical excitation is provided by a conventional, thyratron switched, capacitor discharge circuit, coupled with an internal, capacitively loaded, uv spark preionisation scheme, resulting in a rapid energy deposition into the …
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A model for the initiation and propagation of electrical streamers in transformer oil and transformer oil based nanofluids
… power apparatus cooling is due to their greater electrical breakdown strength and thermal conductivity than gaseous insulators, while their ability to conform to complex geometries and self-heal means that they are often of more practical use than solid insulators. Transformer oil is a …
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Investigation of Zinc Oxide Nanowires for Impedance Based Structural Health Monitoring
… in the form of vibration under the presence of electrical excitation. With the help of a mathematical model, piezoelectric constants are estimated for these samples. A layer of ZnO nanowires were grown on plane woven fiberglass fabric that was incorporated into a carbon fiber epoxy composite. …
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Light-emitting diodes from polyfluorenes: characterisation and stability of performance
… of device performance under low-intensity electrical excitation. A phenomenon is investigated in which the quantum efficiency is dramatically increased during the early stages of driving. Ionic motions are ruled out, and the observations are attributed to the trapping of charge in the …
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Advanced Techniques for Cardiovascular Magnetic Resonance Imaging in Cases of Irregular Motion
… arrhythmia leads to pathological changes in the electrical excitation of the heart. This can cause irregular heart beat variations and result in very long scan times for the functional assessment of the heart in patients suffering from arrhythmia. This thesis presents new MRI methods which …
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Charge Carrier Balance in Lead Halide Perovskite Light Emitting Diodes
… measurements in-situ on a device under hybrid electrical-optical excitation, it is found that the LHP in-device PLQY is increased significantly and transiently by electrical excitation, which allows us to resolve the contradictory charge balance and EQE results. These experiments are supported …
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Telecom Wavelength Quantum Devices
… in a p-i-n doped optical cavity, processed with electrical contacts, and found to emit entangled pairs of photons under electrical excitation. The work of this thesis provides considerable technological advances to the field of entangled-light sources, that in the near future may allow for …
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Organic semiconductor lasers with two-dimensional distributed feedback
… an OS on a nanopatterned substrate. Upon optical excitation with femtosecond laser pulses laser operation is observed. It is characterized using time-integrated and time-resolved spectroscopy. As active medium two of the most promising electroluminescent organic materials were employed, namely the …
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Controlling Triplet Excitons in Organic Semiconductors with Lanthanide-Doped Nanoparticles
… dynamics of OSCs under both optical and electrical excitation. However, in most closed-shell OSCs, triplet excitons are dark states that can neither be directly photogenerated nor harvested luminescently, which fundamentally limits their practical utilisation. Overcoming these limitations …
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Defining a Novel Role for the E3 Ubiquitin Ligase Wwp1 in Cardiac Arrhythmogenesis
… in concert to maintain a coordinated wave of electrical excitation among cardiomyocytes in order to ensure a proper and synchronized contraction of the myocardium. The precise localization of gap junctions to the ID is established during postnatal cardiac development in a progressive and …
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Visible light emission from Eu-containing Si-based materials
… the efficiency of photon absorption for excitation wavelengths shorter than 300 nm. Due to this properties Eu-doped SiOC offers great potentialities for the fabrication of light sources. In this thesis a continuous redshift of the emission peak from 400 to 600 nm by increasing the Eu …
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New modalities of strain-based engineering of ferroelectrics: domain structure and properties of PbZr1-xTixO3 thin films
… strain mapping and multi-dimensional band-excitation switching spectroscopy. We observe that the presence of compositional and strain gradients can preferentially stabilize highly-energetic, needle-like domains, which under electrical excitation are highly labile in the out-of-plane …
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Site-controlled quantum dots as sources of quantum light
… photon pairs, by both optical and electrical injection, generated on demand. However, conventional self-assembled QDs are necessarily characterized by random positioning and randomly distributed optical properties, which limit the feasibility of a technology based on this kind of …
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Study of Singlet-Delta Molecular Oxygen
Made available in DSpace on 2017-07-06T18:55:43Z (GMT). No. of bitstreams: 2 Ottinger_Catherine_A_MS.pdf: 20663206 bytes, checksum: a3022176843d2c08f46a2823faa9ad74 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1983