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caltechETD 檢索結果共 5156 筆,本頁資料從第 229 筆到第 240 筆

Shear flows in the vicinity of a free surface are a problem with numerous applications, perhaps the most obvious being the wakes of seagoing surface vessels. The flow behind a full-scale ship is extremely complex â so much so that it is frequently more instructive to consider simpler cases highlighting particular elements of the larger problem. To that end, an experime....

By Bradley S. Dooley--California Institute of Technology--2005-05-26
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The detailed photochemistry of nitrate ions trapped within polycrystalline ice has been investigated. Using a variety of experimental techniques, the photolysis of NO3- within ice is shown to produce NO, HONO, NO2- and NO2 as stable and metastable products. The gaseous products are released to the overlying gas phase. Implications of these results for chemical transform....

By Christopher Shawn Boxe--California Institute of Technology--2005-05-26
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Channel coding is a key component of artificial communication systems, allowing reliable communication using unreliable channels. In the last decade, iteratively decoded channel codes have become or clearly will become standards in a wide range of applications where large amounts of information must be communicated using unreliable media. Of the class of iteratively dec....

By Jeremy Thorpe--California Institute of Technology--2005-05-25
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Experiments have been conducted in the GALCIT Supersonic Shear Layer Facility (S3L) to investigate the behaviour of a flow and geometry with many features that are potentially useful for a Supersonic Combustion Ramjet (SCRAMJET) engine - a recirculation zone for flameholding, enhanced mixing between fuel and air, and low total-pressure losses. In a subsonic diffuser con....

By Michael Bernard Johnson--California Institute of Technology--2005-05-25
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The present work is an extensive investigation of the contribution of orienting behavior to preference decision making in humans. The central claim of this thesis is that gaze assists cognition in choosing preference, integrating phenomena previously demonstrated in the literature, the mere exposure effect and preferential looking, in a positive feedback loop leading to....

By Claudiu Simion--California Institute of Technology--2005-05-25
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We address in this thesis two primary questions aimed at improving our ability to calculate reliably in the Standard Model of particle physics and probing possible new particles which may exist beyond it. First, we embark on an attempt to account for the abundance of matter in the present Universe if earlier in its history matter and antimatter were equally abundant. We....

By Christopher Lee--California Institute of Technology--2005-05-25
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In the last half century, biologists have made great strides towards understanding the intricate structure of the cell and the relation between this structure and cellular function. Single-molecule techniques and advances in microscopy have also significantly changed the way in which biologists ask and answer questions. As biological measurements and techniques have bec....

By Paul Alexander Wiggins--California Institute of Technology--2005-05-25
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Sensory information is represented in the brain through the activity of populations of neurons. How this information is encoded and how it is processed and read out are crucial questions in neuroscience. The work presented here examines these issues using an insect brain model system. Specifically, this work addresses how odor information is represented across a populat....

By Ofer Mazor--California Institute of Technology--2005-05-24
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This thesis examines two predictions of general relativity: weak lensing and gravitational waves. The cosmic microwave background (CMB) is gravitationally lensed by the large-scale structure between the observer and the last-scattering surface. This weak lensing induces non-Gaussian correlations that can be used to construct estimators for the deflection field. The erro....

By Michael Henry Kesden--California Institute of Technology--2005-05-20
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We prove the twisted weighted fundamental lemma for the group $GL(4) imesGL(1)$ relative to a certain outer automorphism $alpha$, which yields $GSp(4)$ as a twisted endoscopic group. This version of the fundamental lemma is needed to stabilize the twisted trace formula for the pair $(GL(4) imesGL(1),alpha)$. This stabilized twisted trace formula is required for Arthur's....

By David Whitehouse--California Institute of Technology--2005-05-20
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My general research direction is the interface between organic chemistry and biology. Interesting biological systems inspire target-oriented organic synthesis, new methodology development, and molecular design of novel materials. On the other hand, chemical synthesis prepares important biologically active compounds to be used in understanding involved mechanism and engi....

By Xin Qi--California Institute of Technology--2005-05-19
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One of the key mandates of modern optoelectronic research is the development of compact photonic integrated circuits, capable of performing many diverse functions for the generation, manipulation, and detection of light, all on a single chip. A key practical requirement for such circuits is the development of optical devices for the localization and processing of light ....

By William M. J. Green--California Institute of Technology--2005-05-19
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