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caltechETD 檢索結果共 5156 筆,本頁資料從第 49 筆到第 60 筆

The goal of this thesis is to develop a full dimensional micromechanics-inspired constitutive model for polycrystalline shape-memory alloys. The model is presented in two forms: (1) The one-dimensional framework where we picture the ability of the model in capturing main properties of shape memory alloys such as superelasticity and shape-memory effect; (2) The full dime....

By Amir Sadjadpour-Mechanical Engineering-California Institute of Technology-doctoral-2006-05-30
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We have experimentally verified that visible light emission for various organic light emitters can be enhanced through the use of surface plasmon coupling layers. By matching the plasmon frequency of a thin unpatterned silver film to the emission of a dye-doped polymer deposited onto this metal surface, we have observed an 11-fold enhancement of light emission. By patte....

By Terrell Demetris Neal-Electrical Engineering-California Institute of Technology-doctoral-2006-05-30
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Stream processing systems receive continuous streams of messages with relatively raw information and produce streams of messages with processed information. The utility of a stream-processing system depends, in part, on the accuracy and timeliness of the output. Streams in complex event processing systems are processed on distributed systems; several steps are taken on ....

By Andrey Khorlin-Computer Science-California Institute of Technology-masters-2006-05-26
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The proliferation of the Internet and sensor networks has fueled the development of applications that process, analyze, and react to continuous data streams in a near-real-time manner. Examples of such stream applications include network traffic monitoring, intrusion detection, financial services, large-scale reconnaissance, and surveillance. Unlike tasks in traditional....

By Lu Tian-Computer Science-California Institute of Technology-masters-2006-05-26
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Nuclear thermal thrusters long ago bypassed the 50-year-old specific impulse (Isp) limitation of conventional thrusters, using nuclear powered heat exchangers in place of conventional combustion to heat a hydrogen propellant. These heat exchanger thrusters experimentally achieved an Isp of 825 seconds, but with a thrust-to-weight ratio (T/W) of less than ten they have t....

By Kevin L.G. Parkin-Aeronautics-California Institute of Technology-doctoral-2006-05-26
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We review our understanding of spin-1 and spin-2 massless particles as mediators of long-range forces. We discuss how a quantum description of such particles that is compatible with Lorentz covariance leads to gauge invariance, a mathematical redundancy in the description of the physics. We discuss the Weinberg-Witten theorem, which underlines the need for gauge invaria....

By Alejandro Jenkins-Physics-California Institute of Technology-doctoral-2006-05-26
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Modern string theory naturally gives rise to an assortment of dynamical geometrical objects of various dimensions (collectively referred to as "branes") embedded into spacetime. The aim of this thesis is to present a series of results (of varying novelty and rigor) pertinent to dynamics of the low-dimensional geometrical objects of this kind. The processes considered ar....

By Oleg Evnin-Physics-California Institute of Technology-doctoral-2006-05-26
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The coordination chemistry of monovalent and divalent manganese complexes supported by the anionic tris(phosphino)borate ligand [PhBPiPr3] is presented. The halide complexes, [PhBPiPr3]MnCl and [PhBPiPr3]MnI, have been characterized by XRD, SQUID magnetometry, and EPR spectroscopy. The halide [PhBPiPr3]MnI serves as a precursor to manganese azide, alkyl, and amide speci....

By Connie Chih Lu--California Institute of Technology--2006-05-26
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Success in computational design of proteins requires a good understanding of the physical properties that determine the protein structure. However, computational protein design also provides us the opportunities to test and improve our current knowledge of protein structure. In our lab, the "protein design cycle" is used to improve the energy function and increase our k....

By Eun Jung Choi--California Institute of Technology--2006-05-26
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In this thesis we study problems arising in the design of sense and respond systems and present analytical solutions to them as well as results from experiments dealing with real systems. Sense and respond systems employ sensors and other sources of data to sense what is happening in their environments, process the obtained information, and respond appropriately. A goal....

By Agostino Capponi-Computer Science-California Institute of Technology-masters-2006-05-25
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Protein design requires the rapid evaluation of very large numbers of equations during the course of a calculation. These equations must represent the important contributors to protein stability in simple and accurate terms. Some physical phenomena are relatively easy to model such as van der Waals forces. Electrostatics and solvation in a protein environment are forces....

By Eric Stafford Zollars-Biochemistry and Molecular Biophysics-California Institute of Technology-doctoral-2006-05-25
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On the path toward the realization of silicon-based optical emitters for integrated microelectronics, this thesis studies the optoelectronic properties of silicon nanocrystals as a function of their surface passivation and their interactions with plasmonic materials. The first part of the thesis utilizes controlled oxidation exposures and photoluminescence spectroscopy ....

By Julie Suzanne Biteen--California Institute of Technology--2006-05-25
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