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.
Results
Showing 1 to 20 of 86 for “"low threshold"”.
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Low threshold organic and quantum dot nanobeam lasers
… and deposition using fabrication techniques of low complexity. These materials have been used to demonstrate low lasing thresholds, and we hope to improve upon them with a novel design, paving the way towards electrically pumped and continuous wave operation lasing. In this thesis we couple the …
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Low threshold random lasing from phase separated optical fibers.
In this thesis, a low threshold novel random fiber laser, integrating a passive optical fiber with a phase separated aluminosilicate core – silica cladding as the feedback medium, is proposed and presented. The core exhibits greatly enhanced Rayleigh scattering, therefore requiring a significantly …
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Remote temperature sensing with low-threshold-power using erbium-doped fiber laser
… use Raman amplifiers which have relatively high threshold power of higher than 1 W to trigger the laser and this consequently increases the total cost for the implementation. Motivated to achieve a lower threshold power, this thesis presents a remote temperature sensor that utilizes erbium-doped …
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Soft pneumatic artificial muscles with low threshold pressures for a cardiac compression device
… soft pneumatic artificial muscles (PAMs) with low threshold pressures that are intended for direct cardiac compression (DCC). McKibben type PAMs typically have a threshold pressure of at least lOOkPa and require rigid end fittings which may damage soft tissue and cause local stress …
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Patient Perspectives, Follow-up Patterns, and Cost-Effectiveness of a Low-Threshold Mobile Medical Unit
… therapy for OUD, including buprenorphine. Low-threshold approaches to delivering medication for OUD, such as mobile medical units, acknowledge and address these barriers by meeting individuals where they are. The services provided, populations served, and implementation lessons of mobile …
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Low threshold vertical cavity surface emitting lasers integrated onto Si-CMOS ICs using novel hybrid assembly techniques
… at M.I.T.. VCSELs device characteristic show threshold currents of 1 to 2.5 mA and thermal impedances as low as 1.6 OC/mW, similar to native substrate device impedances. This technique intimately connects devices within the dielectric stack, allowing for size independent, wafer scale …
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Mentor mothers in family practice. The implementation of a low threshold intervention for abused mothers and their children
Contains fulltext : 178911.pdf (Publisher’s version ) (Open Access)
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Engineering J-aggregate cavity exciton-polariton devices
… lasers (in both VCSEL and DFB form factor), low-threshold optical switches, and photodetectors. In all of these areas, thin films of "Jelley aggregates," or J aggregates, offer a promising materials platform thanks to their narrow linewidth and high oscillator strength at room temperature, …
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Modeling of DFB surface emitting lasers and semiconductor laser arrays
… the desired laser output characteristics, i.e., low threshold condition, large side mode suppression ratio, and stable and low noise Bragg-mode outputs, can be obtained by systematically optimizing the device length, optical coupling and phase shifter in the device.
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Design and fabrication of quantum-dot lasers
… and quantum-well counterparts namely: low threshold current, high differential gain and highly temperature stable light-current characteristics. This thesis investigates the lasing characteristics of a ridge-waveguide laser containing seven layers of quantum dots as the active region. A …
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GROUP I METABOTROPIC GLUTAMATE RECEPTORS ON SELECTIVE CELLULAR SUBTYPES IN EPILEPTOGENIC MALFORMED CORTEX
… (PMZ). In addition there was a novel response in low threshold spiking (LTS) interneurons via mGluR5 activation. To determine whether cell specific expression of these receptors was altered in malformed cortex immunohistochemical stains were performed for group I mGluRs along with non-overlapping …
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Efficient Föster energy transfer : from phosphorescent organic molecules to J-aggregate thin film
… light and matter, include room temperature low power optical switches and low threshold lasers. Recent work has shown that a J-aggregate strong-coupling device can be powered not just optically but also electrically. However, since J aggregates are engineered for their optical and not …
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THE STUDY OF PERPENDICULARLY MAGNETIZED COFE/PD MULTILAYERS FOR DOMAIN WALL MOTION
… nanowire with strong PMA. We find that high PMA, low saturation magnetization, narrow DW width and high spin polarization can induce low threshold current density for DW motion in CoFe/Pd superlattice-like multilayer films. Next, we show that DW motion can be driven by a low Jth with small bias …
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Development of multifunctional software for evaluating the photonic properties of new dielectric composite geometries
… problem. The code supports parallelization, allowing solutions to be obtained quickly using a beowulf cluster. An extension to the basic FDTD plane wave source was derived, allowing for the creation of angled, periodic, unidirectional plane waves on a square grid. 1D photonic crystal stacks …
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Biomarkers of Lipid Oxidation in the Oral Cavity
… Characteristic volatile compounds, often with low threshold odors, are secondary products of lipid oxidation reactions. Metallic flavor in food and beverages has been linked with oxidation of lipids in the oral cavity. Breath, an emerging medium for analysis of internal condition, is one means …
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Building Good Habits. Longitudinal Studies on Malleable Psychological Factors, Reduced Motivational Interference, and Facilitated Goal Attainment
… interference in self-regulated behavior with a low-threshold, scalable intervention. When choosing an activity (e.g., studying for an upcoming exam), we simultaneously decide to forgo other activities (e.g., watching Netflix). If we now feel we want or should do a forgone activity, we experience …
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The design and fabrication of an electrically activated photonic crystal microcavity laser
… are distinguished for their high efficiency, low threshold, high speed, and low noise operation. However, microcavity lasers by nature have low output power. Thus, microcavity lasers are ideal light sources for applications requiring low power such as integrated optics or quantum computation. …
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Encoding of periodic skin stimuli by spinal dorsal horn neurons
… spinal dorsal horn, which is known to process low threshold mechanoreceptive input. The studies presented here were designed to assess the possible role of the dorsal horn in the encoding of vibrotactile pitch. To accomplish this task, dorsal horn single unit extracellular recordings were …
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Traffic engineering for inter-domain optical networks
… is characterized by two system parameters, high threshold (H) and low threshold (L). A simulation is conducted with different network topologies. The simulation results show the improvement we achieved in term of packets loss, resource utilization, blocking probability and delay.
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Mechanisms of rapid receptive field reorganization in rat spinal cord
… injection of capsaicin into tactile RFs of low threshold mechanoreceptive dorsal horn neurons produced no effect on the RF sizes that are consistent with other studies. Following the injection, the original RFs were completely silenced (46%) or remained responsive (54%).
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