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caltechETD 檢索結果共 5156 筆,本頁資料從第 13 筆到第 24 筆

The brain continually integrates stimuli over multiple sensory modalities and reconciles often disparate information into a unified, consistent representation of the surrounding environment. This process must be robust to differential neural latencies and imperfect alignments of spatial reference frames between sensory modalities. Numerous studies have examined the perc....

By Dylan Nieman-Computation and Neural Systems-California Institute of Technology-doctoral-2006-10-24
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This thesis presents a computational method for seamlessly bridging the atomistic and the continuum realms at finite temperature. The theoretical formulation is based on the static theory of the quasicontinuum and extends it to model non-equilibrium finite temperature material response. At non-zero temperature, the problem of coarse-graining is compounded by the presenc....

By Yashashree Kulkarni-Applied Mechanics-California Institute of Technology-doctoral-2006-10-20
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Ion thrusters offer the potential to enable many future interplanetary robotic missions presently under consideration by NASA. To realize the benefits offered by these low thrust devices, the sputtering mechanisms that are responsible for the degradation of thruster components over time must be well understood. Predictions of thruster life depend directly on the materia....

By Robert David Kolasinski-Mechanical Engineering-California Institute of Technology-doctoral-2006-10-12
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The 321 nm band photodecarboxylation of aqueous pyruvic acid, PA, solutions was studied in the range 5 <= [PA] <= 100 mM. Prompt and delayed CO2 production stages are detected using TEMPO as a scavenger. These two processes are resolved in the photolysis of frozen solutions: after simultaneous evolution during illumination, additional CO2 is quantified in the dark (Ea ~....

By Marcelo Ioel Guzman-Environmental Science and Engineering-California Institute of Technology-doctoral-2006-10-12
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During development an organism undergoes many rounds of pattern formation, generating ever greater complexity with each ensuing round of cell division and specification. The instructions for executing this process are encoded in the DNA, in cis-regulatory modules that direct the expression of developmental transcription factors and signaling molecules. Each transcriptio....

By Meredith Howard Ashby-Biochemistry and Molecular Biophysics-California Institute of Technology-doctoral-2006-10-05
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Vortex-induced vibrations have been studied experimentally with emphasis on damping and Reynolds number effects. Our system was an elastically-mounted rigid circular cylinder, free to oscillate only transverse to the flow direction, with very low inherent damping. We were able to prescribe the mass, damping, and elasticity of the system over a wide range of values, with....

By Joseph Thomas Klamo-Mechanical Engineering-California Institute of Technology-doctoral-2006-09-29
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The stochastic Brownian motion of individual particles in solution constrains the utility of single-particle fluorescence microscopy both by limiting the dwell time of particles in the observation volume and by convolving their internal degrees of freedom with their random spatial trajectories. This thesis describes the use of active feedback control to eliminate these ....

By Andrew J. Berglund-Physics-California Institute of Technology-doctoral-2006-09-27
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Neuronal networks are established during development by the formation of connections (synapses) between neurons. Once formed, these synapses undergo experience-dependent modifications throughout the lifespan of the animal (synaptic plasticity). Additionally, the connectivity pattern itself can be modified in an activity-dependent manner (architectural plasticity). Chang....

By Shreesh Pranesh Mysore-Control and Dynamical Systems-California Institute of Technology-doctoral-2006-09-25
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An incompressible vorticity-streamfunction (VS) method is developed to investigate the single-mode Richtmyer-Meshkov instability in two and three dimensions. The initial vortex sheet (representing the initial shocked interface) is thickened to regularize the limit of classical Lagrangian vortex methods. In the limit of smaller thickness, the initial velocity converges t....

By Marco Latini-Applied and Computational Mathematics-California Institute of Technology-doctoral-2006-09-22
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The neural crest is a transient population of cells that migrate away from the dorsal neural tube in the vertebrate embryo. As the developing hindbrain constricts into rhombomeres, cranial neural crest cells migrate in three discrete streams adjacent to even-numbered rhombomeres, rhombomere 2 (r2), r4, and r6. To test the role of intrinsic versus extrinsic cues in influ....

By Carole Chih-Chen Lu-Biology-California Institute of Technology-doctoral-2006-09-21
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This dissertation focuses on two topics concerning the connections between structure and property in ferroelectric thin films. First, the synthesis of highly oriented ferroelectric thin films is addressed, where the texture is needed to generate high strains that rely on electromechanical domain switching. The ferroelectric films are integrated with oxide electrodes ont....

By Mohamed El-Naggar-Mechanical Engineering-California Institute of Technology-doctoral-2006-09-08
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The "wires project" in the Gray group has been focused on characterizing short-lived intermediates of Fe heme enzyme catalytic cycles by designing and synthesizing photosensitizers (wires) that bind to the protein active site with high affinity. The heart of this thesis is on rhenium channel binding and ruthenium surface binding wires for inducible nitric oxide synthase....

By Yen Hoang Nguyen-Chemistry-California Institute of Technology-doctoral-2006-09-07
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