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 1210 for “"Lenses"”.
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Interactive Visualization Lenses:
… tools. This thesis focuses on interactive magic lenses, specialized locally applied tools that temporarily manipulate the visualization. These may include magnification of focus regions but also more graph-specific functions such as pulling in neighboring nodes or locally reducing edge clutter. …
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Cosmology through gravitational lenses
In dieser Dissertation nutze ich den Gravitationslinseneffekt, um eine Reihe von kosmologischen Fragen zu untersuchen. Der Laufzeitunterschied des Gravitationslinsensystems HE1104-1805 wurde mit unterschiedlichen Methoden bestimmt. Zwischen den beiden Komponenten erhalte ich einen Unterschied von …
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Nanofocusing Refractive X-Ray Lenses
… the production of nanofocusing refractive x-ray lenses. These optics made of either silicon or diamond are well-suited for high resolution x-ray microscopy. The goal of this work is the design of a reproducible manufacturing process which allows the production of silicon lenses with high …
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Radiation Damage in Permanent Magnet Lenses
… radiography experiments is known to damage these lenses and degrade image quality. This effect is studied under controlled conditions, leading to the conclusion that nonuniform radiation damage is inherent to the quadrupole configuration and results in increased multipole moments which degrade the …
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Three Lenses of Contrapower Sexual Harassment
… contrapower harassment through three different lenses: The perspective of harassment targets, harassers, and bystanders. In doing so, it relies on O’Hare and O’Donohue’s (1998) Four Factor Theory of Sexual Harassment as a framework to examine the influence of personality traits and gender …
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Radio-polarimetric observations of gravitational lenses
The goals of this thesis were to study the observational radio-polarimetric properties of gravitational lens systems. Such studies can constrain lensed source properties, propagation effects in the intervening lensing galaxies, and the general-relativistic invariance of polarization under lensing. …
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New lenses on managing demand volatility
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Therapeutic contact lenses for extended drug delivery
… interest in hydrogel-based drug-eluting contact lenses as platforms for topical ocular drug delivery. These devices have shown to provide an increased residence time of drugs at the surface of the eye, leading to enhanced bioavailability (~ 50%) when compared to eye drops (1–5%). One major …
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Tear protein interaction with hydrogel contact lenses
… complexity of the tears. The use of contact lenses for either vision correction and cosmetic reasons or as a route for the controlled drug delivery, has significantly increased in recent years. It is relatively easy to introduce a contact lens Into the tear fluid and remove after a few …
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Fresnel phase plates as reconfigurable microfluidic lenses
… phase plates were tested as reconfigurable lenses. The lenses were constructed from a Fresnel pattern which was transferred to a silicon substrate via photolithography. A layer of PDMS was spin-coated on the substrate and cured to produce the lens. This lens was attached to a PDMS control …
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Design and Development of Advanced Adaptive Polymer Lenses
… design and implementation. Singlets and doublets lenses were constructed for visible, short- wavelength infrared (SWIR), and middle-wavelength infrared (MWIR)applications. The lenses are implemented in a variety of tactical imaging systems to demonstrate their performance. A process was developed …
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Metric-based optimisation of acoustic lenses and waveguides
This dissertation develops an automated procedure for the design of acoustic waveguides that can support single parameter (1P) wave propagation over a large bandwidth. 1P waves include plane, cylindrical and spherical waves, and the waveguides aim to either perturb their path or convert between …
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Acrylamide Based Hydrogels for Continuous Wear Contact Lenses
The primary aim of this research has been the development of a hydrogel polymer having a suitable balance of properties to meet the requirements of a continuous wear contact lens material. This has been achieved by making a number of chemical modifications to a simple acrylamide-based copolymer in …
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Integrated optical multiple waveguide coupler switches and lenses
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science.
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The measurement of time delays in gravitational lenses
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Toward a drug delivery coating for intraocular lenses
… a multi-drug delivery coating for intraocular lenses (IOL). The establishment of a drug delivery coating for intraocular lenses required key advances in ultrathin film technology. This thesis focused on rational polymer design for tailored release, incorporation of hydrophobic small molecule …
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