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caltechETD 檢索結果共 5156 筆,本頁資料從第 37 筆到第 48 筆

The base stack within double-helical DNA provides an efficient pathway for charge transport. This DNA-mediated charge transport chemistry has been shown to be exquisitely sensitive to minor perturbations in DNA structure and base stacking both in solution and on surfaces. As a result, electrochemical studies on DNA-modified electrodes may provide a novel approach to the....

By Tao Liu-Chemistry-California Institute of Technology-doctoral-2006-07-19
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The Wigner-Ville Distribution, and related refinements, represent a class of advanced time-frequency analysis tools that are distinguished from Fourier and wavelet methods by an increase in resolution in the time frequency plane. Time-frequency analysis provides a set of exploratory tools for analyzing changing frequency content in a signal, which can then be correlated....

By Samuel Case Bradford-Civil Engineering-California Institute of Technology-doctoral-2006-07-19
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Chondroitin sulfate glycosaminoglycans are ubiquitously expressed linear, sulfated polysaccharides involved in cell growth, neuronal development and spinal cord injury. The different sulfation motifs presented by chondroitin sulfate may regulate its activity, but efforts to understand the precise biological roles of this glycosaminoglycan have been hampered by its compl....

By Sarah Erin Tully-Chemistry-California Institute of Technology-doctoral-2006-07-19
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The first enantioselective, catalytic vinylogous Mukaiyama-Michael reaction of siloxyfurans with simple alpha,beta-unsaturated aldehydes has been reported using chiral imidazolidinones. This methodology provides access to enantioenriched gamma-butenolides, a privileged motif in organic synthesis. The utility of this organocatalytic Mukaiyama-Michael reaction was highlig....

By Nicole C Goodwin-Chemistry-California Institute of Technology-doctoral-2006-07-17
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Large-grained polycrystalline silicon thin-films on low-cost substrates are an interesting area of research for photovoltaic devices. Such devices, with grain sizes larger than the thickness of the cell, have the potential to achieve multicrystalline-like efficiencies of 15%, but at a much lower cost by taking advantage of thin-film manufacturing techniques. In this the....

By Christine Esber Richardson-Applied Physics-California Institute of Technology-doctoral-2006-06-21
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Rapid advances in information processing, communication and sensing technologies have enabled more and more devices to be provided with embedded processors, networking capabilities and sensors. For the field of estimation and control, it is now possible to consider an architecture in which many simple components communicate and cooperate to achieve a joint team goal. Th....

By Vijay Gupta-Electrical Engineering-California Institute of Technology-doctoral-2006-06-20
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This thesis deals with two aspects of the mechanics of symmetry-breaking defects such as phase boundaries, inclusions and free surfaces, and their role in the macroscopic response of active materials. We first examine the problem of kinetics using a nonlocal theory, and then study the role of geometry in active materials with fields that are not confined to the material....

By Kaushik Dayal-Mechanical Engineering, minor in Materials Science-California Institute of Technology-doctoral-2006-06-12
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The mechanical characterization including evolution of damage and failure of foams and composites are becoming increasingly important, as they form the basic components of sandwich structures. Sandwich structures consist of two faceplates that surround a core material. In many modern applications, faceplates and cores are typically comprised of composite materials and p....

By Theresa Hiromi Kidd-Aeronautics-California Institute of Technology-doctoral-2006-06-08
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This thesis presents a study of the lateral variations of the crustal structure in Southern California from the waveform data recorded by the Southern California Seismic Network (SCSN) stations, the LARSE I and II surveys. The Receiver Function method is used to process the teleseismic waveform data to map the lateral variations of the crustal structure. A first arrival....

By Zhimei Yan-Geophysics-California Institute of Technology-doctoral-2006-06-05
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TCP/IP can be interpreted as a distributed primal-dual algorithm to maximize aggregate utility over source rates. It has recently been shown that an equilibrium of TCP/IP, if exists, maximize the same aggregate utility function over both source rates and routes, provided pure congestion prices are used as link costs in the shortest-path calculation of IP. Moreover, the ....

By John Pongsajapan-Computer Science-California Institute of Technology-masters-2006-06-02
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How do we design a communication network for processing elements (PEs) on a single chip that minimizes application communication time and area? In designing such a network it is essential to use a network communication pattern that matches application communication and area requirements. This report characterizes the design space of a particular communication pattern fo....

By Nikil Mehta-Computer Science-California Institute of Technology-masters-2006-05-31
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As we scale to larger chip capacities, it becomes possible to map large, concurrent applications to programmable fabrics. These applications often have irregular and dynamic communication requirements. Packet-switched networks provide efficient implementations for such applications on these fabrics. In this research, we show how to engineer high-performance packet-switc....

By Nachiket Ganesh Kapre-Computer Science-California Institute of Technology-masters-2006-05-31
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