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caltechETD 檢索結果共 5156 筆,本頁資料從第 85 筆到第 96 筆

This thesis presents the scanning tunneling spectroscopic studies of the non-universal electronic properties among electron- and hole-doped cuprates. Tunneling spectra of the electron-doped Sr0.9La0.1CuO2 and the hole-doped YBa2Cu3O6+delta reveal distinctly different behavior in the pairing symmetries, pseudogap phenomena, satellite features, and low-energy excitations.....

By Ching-Tzu Chen--California Institute of Technology--2006-05-19
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In the next decade, the detection of gravitational-wave signals by ground-based laser interferometric detectors (e.g., the Laser Interferometer Gravitational-Wave Observatory, or LIGO) will provide new information on the structure and dynamics of compact objects such as neutron stars (NS) and black holes (BH), both isolated and in binary systems. Efforts to detect the i....

By Yi Pan--California Institute of Technology--2006-05-19
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The DNA pi stack provides an efficient pathway for transport of electron and electron holes. Ground-state electron transport is furthermore extremely sensitive to subtle DNA structural perturbations, such as a single base mismatch, that alter pi-stacking. As a result, DNA-modified electrodes have allowed the development of highly sensitive diagnostic devices for the det....

By Donato Marino Ceres-Chemistry-California Institute of Technology-doctoral-2006-05-18
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High-latitude climate change will have an impact on the carbon and water cycles in northern ecosystems. Stable isotopes in these systems can serve as indicators of changes and feedbacks. Monitoring the stable isotopic composition of Arctic river discharge provides a means to investigate integrated basin-scale hydrologic changes in remote northern regions. I measured wat....

By Lisa Renee Welp--California Institute of Technology--2006-05-17
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Although the concept of constructing active optical waveguides in crystalline silicon has existed for over twenty years, it is only in the past few years that silicon photonics has been given serious attention as a displacing technology. Fueled by the predicted saturation of "Moore's Law" within the next decade, universities and industries from all over the world are ex....

By Matthew Borselli--California Institute of Technology--2006-05-17
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Area MSTd is involved in the computation of heading direction from the focus of expansion (FOE) of the visual image. Our laboratory previously found that MSTd neurons adjust their focus tuning curves to compensate for shifts in the FOE produced by eye rotation (Bradley et al., 1996) as well as for changes in pursuit speed (Shenoy et al., 2002). The translation speed of ....

By Brian Lee--California Institute of Technology--2006-05-17
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This study of the interaction of magnetic field and flow in the outer shells of giant planets consists of three parts. Part one: The atmospheres of Jupiter and Saturn exhibit strong and stable zonal winds. Busse suggested that they might be the surface expression of deep flows on cylinders. However, the deep flow hypothesis experiences difficulty when account is taken o....

By Junjun Liu--California Institute of Technology--2006-05-16
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This dissertation describes work in three inter-related areas â micro-fluidics, opto-fluidics and fluidic self-assembly. Micro-fluidics has gotten a boost in recent years with the development of multilayered elastomeric devices made of poly (dimethylsiloxane) (PDMS), allowing active elements like valves and pumps. However, while PDMS has many advantages, it is not resi....

By Saurabh Vyawahare--California Institute of Technology--2006-05-16
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The diverse array of protein functions depends upon these molecules' reliable ability to fold into the native structures determined by their amino-acid sequences. Because mutations that alter a protein's sequence frequently disrupt its folding, protein evolution explores protein sequence space conservatively, either by point mutations or recombination between related se....

By David Allan Drummond-Computation and Neural Systems-California Institute of Technology-doctoral-2006-05-15
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We examine the census of star-forming galaxies and their extinction properties at redshift z~2, when a large fraction of the stellar mass in the universe formed. We find a good agreement between the X-ray, radio, and de-reddened UV estimates of the average star formation rate (SFR) for our sample of z~2 galaxies of 50 Msun/yr, indicating that the locally calibrated SFR ....

By Naveen Ananta Reddy--California Institute of Technology--2006-05-15
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Consider a hyperbolic group G and a quasiconvex subgroup H of G with [G:H] infinite. We construct a set-theoretic section s:G/H -> G of the quotient map (of sets) G -> G/H such that s(G/H) is a net in G; that is, any element of G is a bounded distance from s(G/H). This set arises naturally as a set of points minimizing word-length in each fixed coset gH. The left action....

By Thomas Patrick Mack-Mathematics-California Institute of Technology-doctoral-2006-05-12
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For a fixed configuration of ions on a given crystalline lattice, low energy excitations around the static average configuration can be thermally activated and will contribute to the entropy of the system. As such, phonons, spin-waves or electronic excitations have their own entropic contribution. This thesis investigates the entropic effects of lattice vibrations in tr....

By Olivier Delaire--California Institute of Technology--2006-05-12
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