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caltechETD 檢索結果共 5156 筆,本頁資料從第 61 筆到第 72 筆

This thesis gives several applications of effective field theory to processes involving heavy particles. The first is a standard application of heavy quark effective theory to exclusive B decays. It involves two sum rules giving constraints on the curvature of the B->D Isgur-Wise function. This thesis calculates order alpha corrections to these constraints, increasing t....

By Matthew P. Dorsten--California Institute of Technology--2006-05-25
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The enantioselective amine-catalyzed direct aldol reaction of aldehdyes has been accomplished for the first time using an imidazolidinone organocatalyst. That imidazolidinone catalyst, initially developed for LUMO-lowering activation of alpha, beta-unsaturated aldehydes, provides new insight into amine-mediated aldol transition states. The concepts developed in this stu....

By Ian Kyle Mangion--California Institute of Technology--2006-05-25
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This thesis presents an algorithm that autonomously positions recording electrodes inside cortical tissue so as to isolate and then maintain optimal extracellular signal recording quality without human intervention. The algorithm is used to improve the quality and efficiency of acute (daily insertion) recordings that are needed for basic research in neurophysiology. It ....

By Edward A. Branchaud-Mechanical Engineering-California Institute of Technology-doctoral-2006-05-24
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The recognition of DNA base mismatches is of considerable interest for both the diagnosis and treatment of mismatch repair-deficient cancers. Two new mismatch recognition complexes have been synthesized. The first, [Rh(bpy)2(phzi)]3+ (phzi=benzo[a]phenazine-5,6-quinone diimine), recognizes DNA mismatches with high specificity and affinity, 1 x 107 Mm-1, two orders of ma....

By Jonathan Ross Hart-Chemistry-California Institute of Technology-doctoral-2006-05-24
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Calcium/calmodulin-dependent protein kinase II (CaMKII) is a key element in the calcium second messenger cascades that lead to long term potentiation (LTP) of synaptic strength. In this thesis, I have constructed kinetic models of activation of CaMKII and measured some of the unknown parameters of the model. I used the models to elucidate mechanisms of activation of CaM....

By Stefan Mihalas-Physics-California Institute of Technology-doctoral-2006-05-24
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The ability to adapt to a changing environment is central to an organismâs success. The process of associating two stimuli (as in associative conditioning) requires very little in the way of neural machinery. In fact, organisms with only a few hundred neurons show conditioning that is specific to an associated cue. This type of learning is commonly referred to as impli....

By Ronald McKell Carter--California Institute of Technology--2006-05-24
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Evolution has provided us with many protein sequences. However, these sequences represent a very small fraction of the possible sequences. In the laboratory, scientists have explored areas of sequence space not represented by natural proteins both to better understand natural proteins, and to create new proteins with desirable properties. The principle mechanism used to....

By Michelle Margaret Meyer--California Institute of Technology--2006-05-24
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The analysis of complex polypeptide mixtures poses a central and ubiquitous problem to biochemistry, molecular and cellular biology. Historically the problem has been approached by means of gel electrophoretic separation, coupled to immune-chemistry or Edman degradation (Edman 1949) based identification of separated components. These approaches as well as those based on....

By Johannes Graumann--California Institute of Technology--2006-05-24
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We study a certain kind of linear codes, namely divisible codes, over finite fields. These codes, introduced by Harold N. Ward, have the property that all codeword weights share a common divisor larger than 1. These are interesting error-correcting codes because many optimal codes and/or classical codes exhibit nontrivial divisibility. We first introduce an upper bound ....

By Xiaoyu Liu--California Institute of Technology--2006-05-24
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The ability for a mobile robot to localize itself is a basic requirement for reliable long range autonomous navigation. This thesis introduces new tools and algorithms to aid in robot localization and navigation. I introduce a new range scan matching method that incorporates realistic sensor noise models. This method can be thought of as an improved form of odometry. Re....

By Kristopher L. Kriechbaum--California Institute of Technology--2006-05-23
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This thesis introduces a new techniqueâscanning activity gravimetric analysis (SAGA)âfor investigating phase transitions in semicrystalline polymers. Isothermal growth and dissolution of polymer crystallites within picogram to milligram samples are manifested by mass changes in response to changes in the activity of sorbed solvent vapor. Single charged particles are l....

By Adam Paul Olsen--California Institute of Technology--2006-05-23
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This thesis presents studies in two distinct areas of theoretical astrophysics: dynamics of planetary systems and relativistic fluid flows from shocks emerging from stellar envelopes. The first pertains to the early solar system, planet formation, and extrasolar planets; the second is related to extreme explosions like gamma-ray bursts and supernovae. We present two inv....

By Margaret Whei-Jie Pan--California Institute of Technology--2006-05-23
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