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 39 for “"resolution limit"”.
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Diffuse photon transport in tissue-like media: Resolution limit for near-infrared imaging and an instrument for clinical spectroscopy of tissues
… measurements, I consider the ultimate resolution of near-infrared based imaging of tissues using a simple model to describe resolution. I conclude that for a 5 cm thick tissue, the closest two objects buried in the center can be, and still be resolved is roughly 1.5 centimeters. I also …
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Community Detection in Complex Networks
… modularity densityQgeliminatesthe well-known resolution limit problem at any desired resolution and is easily extendable to study weighted and hierarchical networks. We also propose a benchmark test to quantify the resolution limit problem, examine various modularity-like metrics to show that …
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Integrating Network Science and Computational Topology with Applications in Neuroscience Data Analytics
… I prove that multilayer networks suffer from a resolution limit that prevents a popular method of community detection from detecting changes in community structure across layers of the network. I then propose an improvement to the multilayer network model that is more intuitive and helps …
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Acoustic Frequency Domain Reflectometry
… strain determination and is estimated to have a resolution of 0.58 °C over a 20 cm gauge length. An error correction algorithm to improve SNR in the measurement of strain is proposed and validated. The sensing system has a theoretical spatial resolution of 2 mm and an estimated sensing resolution …
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Generation and Measurement of Entangled Atomic Ensembles with an Optical Cavity
Atomic interferometers have a resolution limit set by the projection noise in measurements on ensembles of uncorrelated atoms. To overcome this classical limit and extend precision measurements into the quantum regime, we need to generate complex entangled states of large atomic ensembles and …
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High-Resolution Inversion and Spectral Decomposition: Case Studies from the Bohaiwan Basin, China
… these areas, reservoir thickness below seismic resolution limits the utility of conventional seismic data for reservoir characterization. In the Jiyang area, lacustrine shoreline thin-sand bodies are interbedded with shales, which makes it difficult to detect or map the lateral continuity of …
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STED-4Pi Microscopy
… depletion (STED) has been shown to break Abbe's resolution limit in fluorescence microscopy. This technique suppresses fluorescence at the focal rim by use of a depleting laser pulse. In this thesis, theoretical and experimental examinations show that the combination with another technique, …
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Advancing Community Detection through Ensemble Learning and Modularity Maximization
… detection presents the unique challenge of the resolution limit in modularity-based methods. We first demonstrate how a benchmark bipartite network fails to resolve smaller communities using traditional modularity. We then introduce a new metric, Generalized Bipartite Modularity Density …
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The development of a nanoscale Coulter counter for rapid genetic sequence recognition
… size particles with roughly twenty nanometers of resolution. The characterization of DNA, which is more than an order of magnitude smaller than this resolution limit, requires the development of a detection system with a two nanometer limiting aperture. To help develop the techniques and …
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Physical Models in Community Detection with Applications to Identifying Structure in Complex Amorphous Systems
… structure, our Potts model is free from a "resolution limit" that hinders community solutions for some popular community detection models. It further remains a local measure on weighted and directed graphs. We apply our community detection method to accurately and quantitatively evaluate the …
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Development of a TIRF Microscope for Single Molecule Binding Studies
… labeled with fluorophores with a high time resolution. We built a single-molecule TIRFM from a laser system, two TIR-generating systems (through objective and prism), an inverted microscope, an EMCCD camera, and a computer with analysis programs. A customized prism-lens-holder directed the …
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Development of a tool to probe the biomechanical properties of the endothelial surface layer
… with a precision beyond the diffraction resolution limit. Local viscosity can be assessed by quantifying the nanobeads’ Brownian motion. Results and conclusion: For a vertical range of 4.5 µm, the validity of vertical single particle tracking was 16 nm, with a precision of about 5 nm. In …
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Fundamentals of spatial vision in the barn owl (Tyto alba pratincola) : ocular aberrations, grating acuity, contrast sensitivity, and vernier acuity
… CSF of the barn owl rendered the typical band-limited inverted u-shaped function, with attenuated sensitivities for high and low spatial frequencies. Maximal sensitivity of about 20 was at a spatial frequency of about 1 cyc/deg. With a similar discrimination task, rating acuity was measured in …
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Optimized Microbial Recombinant Production of HIV-1 Anti-Envelope Antibody Fragments with Applications to Single Particle Tracking of Virus Assembly
… with Env in fusion events.</p> <p>Using superresolution microscopy to measure and track host–pathogen interfaces that occur on a scale below the resolution limit of the light microscope is becoming increasingly popular. I have used total internal reflection microscopy (TIRF) and Photoactivated …
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Study of Charged Liquid Cluster Beam Generation and Application to Processing of Thin Films and Nanoparticles
… nm and the smallest size observed within the SEM resolution limit was 5 nm. Quantum wires of GaAs and silicon nanotips were fabricated by combining CLCB deposition of silica nanospheres and reactive ion etching. The median size of the quantum wires is 50 nm. Photoluminescence (PL) measurements …
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Lucky exposures: diffraction limited astronomical imaging through the atmosphere
The resolution of astronomical imaging from large optical telescopes is usually limited by the blurring effects of refractive index fluctuations in the Earth’s atmosphere. By taking a large number of short exposure images through the atmosphere, and then selecting, re-centring and co-adding the …
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Kombinierte Rasterelektronen- und Mehr-Spitzen-Rastertunnelmikroskopie als Methode zur Ladungstransportmessung im Nanometerbereich
… the double-tip STM very compactly so that the resolution and the freedom of movement of the STM tips are comparable to those of a single-tip beetle-type STM. The imaging capabilities of the double-tip STM will be demonstrated by atomically resolved pictures of the Si(111)-7x7 surface, obtained …
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Progress in coherent lithography using table-top extreme ultraviolet lasers
… in chapter III. A detailed discussion of its resolution limit will be presented followed by the development of X-Y-Z positioning stage, the fabrication protocol for diffractive EUV mask, and the pattern transfer using self- developed ion beam etching, and the dose control unit. In addition, …
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Investigation of optical near field using near field scanning optical microscopy
… optical imaging techniques have a fundamental resolution limit due to the diffraction limit of light. The advances of science and technology on the nanoscale demand a new tool for characterization. The Near Field Scanning Optical Microscopy (NSOM) has been developed to tackle certain aspects of …
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Ultrahigh-Resolution Endoscopic Optical Coherence Tomography for In Vivo Mouse Colonoscopy
… up to 2 mm deep in tissue. In this work, factors limiting resolution in OCT were examined and devices were created and applied to mouse colon imaging that extended the state-of-the-art in endoscopic ultrahigh-resolution OCT. First, axial chromatic aberration of the objective optics acts as a …
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