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caltechETD 檢索結果共 5156 筆,本頁資料從第 1 筆到第 12 筆

LixNi0.5Mn0.5O2 and LixNi1/3Mn1/3Co1/3O2 are cathode materials in Li-ion batteries. The changes in their electronic structure during charging/discharging processes were studied by using electron energy loss spectrometry (EELS) in a transmission electron microscope (TEM) and first-principles calculations. Significant growth was observed at O K-edge upon the removal of li....

By Shu Miao-Materials Science-California Institute of Technology-doctoral-2007-01-30
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Nonnatural amino acid incorporation has been one of the most important protein engineering techniques. Particularly site-specific incorporation of nonnatural amino acids would allow design of artificial proteins containing a nonnatural amino acid with minimal perturbation of their native properties. Site-specific incorporation of phenylalanine (Phe) analogs and tryptoph....

By Inchan Kwon-Chemical Engineering-California Institute of Technology-doctoral-2007-01-19
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Phototrophic Fe(II)-oxidizing bacteria use electrons from ferrous iron [Fe(II)] and energy from light to drive reductive CO2 fixation. This metabolism is thought to be ancient in origin, and plays an important role in environmental iron cycling. It has been implicated in the deposition of Banded Iron Formations, a class of ancient sedimentary iron deposits. Consistent w....

By Yongqin Jiao-Molecular Biology-California Institute of Technology-doctoral-2007-01-09
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The theory of nonlinear filtering concerns the optimal estimation of a Markov signal in noisy observations. Such estimates necessarily depend on the model that is chosen for the signal and observations processes. This thesis studies the sensitivity of the filter to the choice of underlying model over long periods of time, within the framework of continuous time filterin....

By Ramon Van Handel-Physics-California Institute of Technology-doctoral-2006-12-12
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This thesis introduces the concept of multilayer impedance pump, a novel pumping mechanism inspired from the embryonic heart structure. The multilayer impedance pump is a composite two-layer fluid-filled elastic tube featuring a thick, gelatin-like internal layer similar in nature to the embryonic cardiac jelly, and that is used to amplify longitudinal elastic waves. Pu....

By Laurence Loumes-Aeronautics-California Institute of Technology-doctoral-2006-12-08
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Information processing using biochemical circuits is essential for survival and reproduction of natural organisms. Construction of synthetic biochemical circuits from simple components provides a useful approach to establish the minimal determinants required for complex logical functions. As stripped-down analogues of genetic regulatory networks in cells, we engineered ....

By Jongmin Kim-Biology-California Institute of Technology-doctoral-2006-12-06
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Naturally-occurring arsenic (As) in the Los Angeles Aqueduct, a major drinking water source for the City of Los Angeles, is removed by precipitating an amorphous iron (Fe) oxyhydroxide floc in the aqueduct waters. The floc is removed via sedimentation at Haiwee Reservoir, where the Fe- and As-rich sediments provide a unique field site for studying the mechanisms of As m....

By Kate Marie Campbell-Environmental Science and Engineering-California Institute of Technology-doctoral-2006-12-05
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NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document The A.C. impedance response of mixed ionic and electronic conductors (MIECs) is derived from first principles and quantitatively compared with experimental data of three model systems: [...] (system I), [...] (system II), and [...] (system III). For the equi....

By Wei Lai-Materials Science-California Institute of Technology-doctoral-2006-11-29
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The Claisen rearrangement of chorismate to prephenate has become an important model system for developing understanding of enzymatic catalysis as well as for computational treatment of enzyme active sites. This thesis presents general methods for the computational design of enzyme active sites and applies these methods to the design of catalysts for the chorismate-preph....

By Jonathan Kyle Lassila-Biochemistry and Molecular Biophysics-California Institute of Technology-doctoral-2006-11-15
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In the field of cardiology, the current ability to accurately detect diastolic dysfunction is unsatisfactory due to the lack of an effective diagnostic index. Currently, assessments of diastolic dysfunction are based on echocardiographic measurements that are assumed to be correlated with progression from mild dysfunction to more severe disease. However, relying on exis....

By Arash Kheradvar-Bioengineering-California Institute of Technology-doctoral-2006-11-01
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Optimization theory and game theory provide a suite of tools that are flexible in modelling various network systems, and a rich series of equilibrium solution concepts and convergent algorithms. In this thesis, we view network protocols as distributed algorithms achieving the corresponding network equilibria, and study wireless network design and control in optimization....

By Lijun Chen-Control and Dynamical Systems-California Institute of Technology-doctoral-2006-11-01
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G protein-coupled receptors (GPCRs) play an essential role in cell communications and sensory functions. Consequently, they are involved in wide variety of diseases and are targets for many drug therapies. Particularly important is the large number of orphan GPCRs, which may play important, albeit unknown, functions in various cells. To understand their respective physi....

By Jiyoung Heo-Chemistry-California Institute of Technology-doctoral-2006-10-30
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