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 102 for “"local field"”.
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Characterization of Local field effect in organic film using pressure technique
… probing technique for studying the effects of local dielectric changes on the excitonic energy levels in amorphous organic thin films for optoelectronic device applications. Compression of organic films causes a decrease in intermolecular spacing and, through solvation effects, lowers the …
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Extraordinary light-induced local field, angular momentum and force near metallic nanoparticles
The intense local field induced near metallic nanostructures provides strong enhancements for surface enhanced spectroscopies, a major focus of plasmonics research over the past decade. Here we show several different nanoantennas for SEIRA detection, which exhibit an order of magnitude greater …
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Investigation of Spatio-Spectral Dynamics of Local Field Potentials in Parkinson’s Disease
… cannot be controlled with medications. Accurate localization of STN is an important factor defining the efficacy of DBS. The most common targeting method in DBS surgery is the microelectrode single unit activity recording, which is performed by listening to bursting firing patterns of individual …
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Assessing Neuronal Synchrony and Brain Function Through Local Field Potential and Spike Analysis
<p>Studies of neuronal network oscillations and rhythmic neuronal synchronization have led to a number of important insights in recent years, giving us a better understanding of the temporal organization of neuronal activity related to essential brain functions like sensory processing and …
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Time-varying phase relationship between spiking neuronal responses and local field potentials in olfactory processing in manduca sexta
… on the coincidence of their spiking relative to local field potential (LFP) oscillation phase. Using the sphinx moth, Manduca sexta, as a model system, we tested the predictions of the TOM with regard to the trial-to-trial consistency of odor driven oscillations, the phase-locking of action …
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Adaptive Detection of Beta Bursts of Local Field Potentials Recorded from Subthalamic Nucleus in Patients with Parkinson’s Disease
… expected to increase within the following years. Local field potentials (LFPs) recorded from deep brain stimulation (DBS) leads placed into the motor territory of the subthalamic nucleus (STN) can be used to investigate the mechanism of PD and allows for further development of new therapeutic …
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Simultaneous Behavior Onset Detection and Task Classification for Patients with Parkinson Disease Using Subthalamic Nucleus Local Field Potentials
… PD patient. The detection is based on recorded Local Field Potentials (LFP) of the Subthalamic nucleus (STN), captured through Deep Brain Stimulation (DBS) process.</p> <p>One main part of this work is dedicated to the research of various properties and features of the STN LFP signals of several …
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Design and Characterization of an Open-Source, High-Efficiency, Easily-Reconfigurable Switch-mode Current Driver for Magnetic Resonance Imaging Applications
B₀ shimming and local B₀ field control (will be collectively referred to as “local field control") is a process employed by current and proposed Magnetic Resonance Imaging (MRI) techniques to yield faster and more detailed scans with greater diagnostic utility. Additional scanner hardware, …
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Neural Processing in the Three Layer Turtle Visual Cortex
… of action potentials as well as the slower local field potential activity.To investigate response properties, we explore spatial properties of receptive fields, temporal properties of spontaneous and evoked activity, response adaptation, and correlations between different types of activity …
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The unramified principal series of p-adic groups : the Bessel function
… maximal torus defined over a nonarchimedean local field. I evaluate a matrix coefficient of the unramified principal series of G known as the "Bessel function" at torus elements of dominant coweight. I show that the Bessel function shares many properties with the Macdonald spherical function …
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Oxygen Polarography in the Awake Macaque: Bridging BOLD fMRI and Electrophysiology
… this new tool we evaluated local field potential and oxygen responses to an engaging visual stimulus in two distinct brain systems. In area V3, a key region in the visual system and representative of stimulus driven sensory cortex, we show increased tissue oxygen and local …
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Large-scale neural recordings and biophysical models for inferring network mechanisms of ketamine anesthesia
… to support unconsciousness. First, I analyze local field potentials and single unit activity from ketamine anesthesia in non-human primates to show that the neocortex under ketamine is hyperactive based on all common measures of neural activity. Furthermore, I demonstrate that spiking …
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Exploring the Role of PANNEXIN1A in an Acute Experimental Model of Parkinson's Disease
… pathways, and reduced ATP production. Local field potentials recorded from three regions of the ascending visual pathway showed complex changes in the beta- and gamma-band power and in the coherence between these regions. MPTP treatment produced significantly impaired movements which …
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Hyper-Rayleigh scattering measurements of hyperpolarizabilities for tetrahedral molecules
… CF4, CD4, and CH4 show evidence that the Lorentz local-field corrections are inadequate in nonlinear optics. Through z-scan measurements, thermal lensing and/or absorption coefficients have been obtained for six molecules.
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Efficient enumeration of extensions of local fields with bounded discriminant
Let k be a p -adic field. It is well-known that k has only finitely many extensions of a given finite degree. Krasner [1966] gives formulae for the number of extensions of a given degree and discriminant. Following his work, we present an algorithm for the computation of generating polynomials for …
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Comparisons of computational methods to represent electron transport in nonequilibrium plasma devices
… These equations can be solved using the local field approximation (LFA), employing conservation equations for the bulk electron energy and momentum, or adding multiple beam components to the electron energy distribution. Combinations of these methods can also be employed. The model has …
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On the slope filtration of [phi]-modules over the Robba ring
… a p-adic representation of the Galois group of a local field, we show that its Galois cohomology can be computed using the associated étale ([phi], [Gamma])-module over the Robba ring; this is a variant of a result of Herr. We then establish analogues, for not necessarily étale (([phi], …
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Detectivity vs. Sensitivity: Non-Hermitian Metasurface Sensor
… for their high sensitivity arising from large local field enhancements. However, their Q-factors are bad resulting in low detectivity for limited power-budget situations. This problem can be alleviated by using an array of plasmonic structures forming a quasi bound state-in-the-continuum (BIC). …
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Design of High-Resolution SAR ADC for Detection of Sub-Cortical Neuron Action Potentials for BMI Applications
… potentials (APs) and slow, higher-amplitude local field potentials (LFPs) under stringent power and area constraints. This thesis presents the design and simulation of a high-resolution, low-power successive approximation register (SAR) analog-to-digital converter (ADC) tailored for …
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