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caltechETD 檢索結果共 5156 筆,本頁資料從第 181 筆到第 192 筆

The Martian seasonal dust cycle is examined with a General Circulation Model (GCM) that treats dust as a radiatively and dynamically interactive trace species. Dust injection is parameterized as being due to convective processes (such as dust devils) and model-resolved wind stresses. Multi-year Viking and Mars Global Surveyor mission air temperature data sets are used t....

By Shabari Basu--California Institute of Technology--2005-09-21
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Non-viral nucleic acid delivery systems must condense nucleic acids into small particles, confer protection from degrading factors in serum and in cells, achieve uptake to targeted cells, direct nucleic acids to appropriate intracellular destinations, release this cargo to permit its action, and exhibit minimal toxicity. The nature of synthetic vectors allows for facile....

By Swaroop Mishra--California Institute of Technology--2005-09-19
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The system comprised of an atom strongly coupled to photons, known as cavity quantum electrodynamics (QED), provides a rich experimental setting for quantum information processing, both in the implementation of quantum logic gates and in the development of quantum networks. Moreover, studies of cavity QED will help elucidate the dynamics of continuously observed open qu....

By Benjamin Leonard Lev--California Institute of Technology--2005-09-15
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Constructing pseudorandom objects based on codes has been the focus of some recent research. These constructions were based on specific algebraic codes and were rather simple in their structure in that a random index into a codeword was picked and $m$ subsequent symbols output. In this work, we explore the question of whether it is possible to extend the scope of applic....

By Shankar Kalyanaraman-Computer Science-California Institute of Technology-masters-2005-09-09
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The utility of non-canonical amino acids in protein engineering has grown substantially over the past decade. Proteins containing these unnatural building blocks often have radically different biochemical or spectral characteristics than their wild-type counterparts. Furthermore, proteins may be endowed with chemical reactivity not found in the natural proteome upon the....

By Aaron James Link--California Institute of Technology--2005-09-09
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The goal of this thesis is to provide constraints on the dark matter density profile in galaxy clusters by developing and combining different techniques. The work is motivated by the fact that a precise measurement of the logarithmic slope of the dark matter on small scales provides a powerful test of the Cold Dark Matter paradigm for structure formation, where numerica....

By David Jerome Sand--California Institute of Technology--2005-09-06
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Microfluidics is increasingly being used in many areas of biotechnology and chemistry to achieve reduced reagent volumes, improved performance, integration, and parallelism, among other advantages. Though early devices were based on rigid materials such as glass and silicon, elastomeric materials such as polydimethylsiloxane (PDMS) are rapidly emerging as a ubiquitous p....

By R. Michael van Dam--California Institute of Technology--2005-08-30
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This thesis explores the evaporation and Rayleigh discharge dynamics of highly charged micron-sized droplets and explores new methodologies for extracting ions for mass analysis from neutral droplets using strong electric fields in a technique termed field-induced droplet ionization. A phase Doppler anemometer characterizes individual highly charged droplets moving thro....

By Ronald L. Grimm-Chemistry-California Institute of Technology-doctoral-2005-08-25
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In early visual cortex, visual input is encoded primarily as edges. Information then flows into more specialized regions of the brain, which process visual features such as color, motion, etc. This encoding scheme poses some problems in explaining the experience of seeing. If the cortex processes various visual features separately, how do we see unified objects? What me....

By Daw-An Wu-Biology-California Institute of Technology-doctoral-2005-08-22
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Over the course of evolution, nature continually discovers new small molecules through the alteration of biosynthetic enzymes and pathways by mutation and gene transfer. Hundreds of these natural products have proven indispensable to medicine, culture, and technology, greatly contributing to increases in the length and quality of human lives. Chemists have found that th....

By Alexander Vincent Tobias-Chemical Engineering-California Institute of Technology-doctoral-2005-08-19
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We present results from an adaptive optics survey conducted with the Palomar and Keck telescopes over 3 years, which measured the frequency of stellar and sub-stellar companions to Sun-like stars. The survey sample contains 266 stars in the 3-10000 million year age range at heliocentric distances between 8 and 200 parsecs and with spectral types between F5-K5. A sub-sam....

By Stanimir Angelov Metchev-Astronomy-California Institute of Technology-doctoral-2005-08-18
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The ever-growing demand for higher rates and better quality of service in cellular systems has attracted many researchers to study techniques to boost the capacity and improve the performance of cellular systems. The main candidates to increase the capacity are to use multiple antennas or to increase the bandwidth. This thesis attempts to solve a few challenges regardin....

By Masoud Sharif-Electrical Engineering-California Institute of Technology-doctoral-2005-08-12
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