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 59 for “"phase shifting"”.
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Non-Photic Phase Shifting: Acetylcholine and Arousal
Non-photic stimuli are capable of producing large phase advances of the suprachiasmatic nuclei (SCN) during the midday in a manner that is different than light. Two prominent non-photic stimuli include confinement to a novel running wheel, and sleep deprivation by gentle handling. It was …
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Broadband pin diode switching and phase shifting
… survey was done on the different types of phase shifters available. A circuit which enables shifts in 45 degree increments was developed. The system consists of Reflection Phase Shifters which are made up of Quadrature Couplers that have different terminations switched in on two of their …
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INFRARED PHASE-SHIFTING INTERFEROMETRY USING A PYROELECTRIC VIDICON
… can rapidly and accurately measure wavefront phase errors during the complete fabrication process, from generation to polishing. The suitability of infrared wavelengths for several optical testing applications is well known, as are the greatly increased speed and accuracy of phase-shifting …
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High-quality 3D shape measurement with binarized dual phase-shifting method
… focused or overly defocused),</p> <p>increased phase noise or harmonic errors will deteriorate the reconstructed surface quality.</p> <p>In this thesis research, two techniques are proposed to overcome the limitations of both</p> <p>DFP and binary defocusing technique: binarized dual phase …
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The acute and phase-shifting effects of artificial bright light on human physiology, performance and symptoms of jet-lag
The periodic alternation of light and darkness over the solar day has a fundamental role in synchronising human circadian rhythms. Artificial light is known to alter circadian timing depending on time of administration; early morning light can advance circadian timing while late evening light can …
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Cholinergic Regulation of the Mammalian Circadian System: Phase Shifting in Vivo and in Vitro in Wildtype and M(1) Knockout Mice Induced by Cholinergic Agonists
… via at least two different pathways. One induces phase advances throughout the night and is mediated via the M1AChR. The other causes a biphasic, light-like response and is not mediated via the M1AChR.
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Control of Harmonics in 6-Pulse Rectifiers
… either active filters, passive filters, or phase shifting methods are used. In medium voltage high power applications, generally, phase shifting method is better suited.</p> <p>In addition to harmonic distortion in AC side, AC-DC converter produce ripple in DC side. DC ripple can be …
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Biochemical Genetic Analysis of Blue Light Responses in Neurospora Crassa
… conidiation and reduced the photosensitivity for phase shifting and carotenogenesis to about 1/16th and 1/4th of normal, respectively. (ii) Riboflavin analogs were used to demonstrate that flavins can function as photoreceptors. The analogs 1-deazariboflavin and roseoflavin, which have red-shifted …
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Terfenol based optical phase modulator and magnetometer
Two new fiber optic magnetostrictive phase modulators and magnetometers using the highly magnetostrictive rare-earth iron compound Tb<sub>x</sub>Dy<sub>l-x</sub>Fe₂ are investigated. They demonstrated to have a high sensitivity, dynamic range, minimum field detectability, and a better structural …
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Genetic algorithm design and testing of a random element 3-D 2.4 GHZ phased array transmit antenna constructed of commercial RF microchips
… ways to model and design multifunction phased array radars. This thesis puts forth the concept that Genetic Algorithms, computer simulations that mirror the natural selection process to develop creative solutions to complex problems, would be extremely well suited in this application. …
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DESIGN OF MONOLITHICALLY INTEGRATED RF-MEMS MULTI-FUNCTIONAL PASSIVES FOR HYBRID BEAMFORMING ARCHITECTURES IN BEYOND-5G AND 6G SCENARIOS
… of single RF-MEMS switches, attenuators and phase shifters are available in the literature since about two decades, still limited attention is dedicated to the development of MEMS-based multi-device monolithic networks embedding such devices. High-performance RF-MEMS networks of this kind …
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Surface Patterning, Electronic Device Fabrication And, Three-Dimensional Self-Assembly Using Polydimethylsiloxane
… neuronal cell growth as well as for generating phase shifting masks with triangular profiles.
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Simultaneous Immersion Mirau Interferometry
… algorithm is based on the principles of Phase-Shifting Interferometry. The largest limitation of Phase-Shifting Interferometry is its sensitivity to the vertical position of the sample. In environments where vibration isolation is difficult, this makes image acquisition challenging. This …
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Nanostructuring magnetic thin films using interference lithography
… magnetic properties is found to include a thin phase-shifting resist stack and a tungsten hardmask.
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Nanolaminate coatings to improve long-term stability of plasmonic structures in physiological environments
… The structures are fabricated using phase-shifting PDMS masks, e-beam deposition, RIE, Atomic Layer Deposition and Rapid Thermal Annealing. An alternate approach using Nanosphere Lithography (NSL) was also investigated. Films were examined using ellipsometry, atomic force microscopy …
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Gradient light interference microscopy for imaging strongly scattering samples
… broadband optical fields in conjunction with phase-shifting interferometry to extract high-resolution and high-contrast structures from otherwise cloudy images. We construct our system from a differential interference contrast microscope, demonstrating our new modality in transmission and …
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Development of X-ray lithography and nanofabrication techniques for III-V optical devices
… a global scale was developed, called holographic phase-shifting interferometry (HPSI). This system, in conjunction with appropriate thermal input can potentially provide active correction of x-ray mask distortion. Current microphotonic fabrication issues are presented along with a detailed …
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Polarization control and measurement with meta-optics
… artificially engineered arrays of subwavelength phase-shifting elements which, if designed with explicit polarization dependence, provide a fascinating platform for new polarization optics. In this thesis, we present metasurface diffraction gratings designed to produce arbitrarily specified …
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Coherence-Gated Wave-Front Sensing in Strongly Scattering Samples
… combines Shack-Hartmann wave-front sensing and phase shifting interferometry (PSI). It employs virtual lenses to mimic the function of a conventional Shack-Hartmann sensor. The use of a modal estimation algorithm allows an approximation of the measured wave-front with a linear combination of …
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