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caltechETD 檢索結果共 5156 筆,本頁資料從第 121 筆到第 132 筆

Predicting how the future climate of Earth will change as a result of increasing human emissions is one of the greatest problems facing science today. The earthâs climate is the result of a delicate balance between incoming and outgoing radiation. Anthropogenic emissions of aerosol particles into the atmosphere have the potential to affect the earthâs climate in signi....

By Tracey Alayne Rissman--California Institute of Technology--2006-04-18
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We developed a "two-way" calibration technique for studying clustered events, particularly their mechanisms and rupture directivities. First, we demonstrate that the magnitude 4 events with known source mechanisms can be used to calibrate the path effects on the short-period (0.5-2 sec) P waves, so that the corrected P waves can be modeled for determining focal mechanis....

By Ying Tan--California Institute of Technology--2006-04-17
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Mobile robot localization and mapping in unknown environments is a fundamental requirement for effective autonomous navigation. Three different approaches to localization and mapping are presented. Each is based on data collected from a robot using a dense range scanner to generate a planar representation of the surrounding environment. This externally sensed range data....

By Samuel Thomas Pfister--California Institute of Technology--2006-04-14
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This thesis is concerned with the exploration and development of a variational finite element mesh adaption framework for non-linear solid dynamics and its conceptual links with the theory of dynamic configurational forces. The distinctive attribute of this methodology is that the underlying variational principle of the problem under study is used to supply both the dis....

By Matias Gabriel Zielonka--California Institute of Technology--2006-04-13
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When a heat flux is applied downwards through a sample of 4He near the superfluid transition temperature T_lambda, the gradient in the temperature self-organizes to the gradient in T_lambda caused by gravity. This creates the Self-Organized Critical (SOC) state. Previous experiments have observed the state, measured the self-organization temperature T_SOC vs. heat flux,....

By Andrew Rosenberg Chatto-Physics-California Institute of Technology-doctoral-2006-04-12
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For steady systems, interpreting the flow structure is typically straightforward because streamlines and trajectories coincide. Therefore the velocity field, or quantities derived from it, provide a clear description of the flow geometry. For unsteady flows, this is often not the case. A more natural choice is to understand the flow in terms of particle trajectories, i.....

By Shawn Christopher Shadden--California Institute of Technology--2006-04-12
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This dissertation focuses on fundamental research in two areas of magnetism, the technologically advanced field of magnetic resonance imaging (MRI) and the nascent discipline of molecular magnetic materials. Contrast agents for MRI based on the gadolinium(III) ion were designed and studied to gain insight into the parameters that may be modulated to control contrast age....

By Joseph Anthony Duimstra--California Institute of Technology--2006-04-12
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High-performance liquid chromatography (HPLC) is one of the most important analytical tools heavily used in the fields of chemistry, biotechnology, pharmaceutics, and the food industry. The power of liquid chromatography comes from its ability to achieve molecular separation with extremely high efficiency and its great flexibility of incorporating versatile sensors for ....

By Chi-Yuan Shih--California Institute of Technology--2006-04-11
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Current stress studies often utilize stress inversions of earthquake focal mechanisms to estimate four parameters of the spatially uniform stress tensor, three principal stress orientations, and a ratio of the principal stresses. An implicit assumption in these studies is that earthquakes are good random samplers of stress; hence, the set of earthquake focal mechanisms ....

By Deborah Elaine Smith--California Institute of Technology--2006-03-27
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Artificial extracellular matrix (aECM) proteins were designed originally for use in small-diameter vascular grafts. Current synthetic grafts fail primarily due to (i) a compliance mismatch between the prostheses and surrounding tissue and (ii) the inability to support the growth of an endothelial cell monolayer. To address these issues, biomimetic proteins were engineer....

By Julie C. Liu--California Institute of Technology--2006-03-21
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We perform an analysis of the three-body charmless decay B+ -> K+K+K- using a sample of 226.0 +/- 2.5 million BB pairs collected by the BABAR detector and measure the total branching fraction and CP asymmetry to be B = (35.2 +/- 0.9 +/- 1.6) x 10-6 and A = (-1.7 +/- 2.6 +/- 1.5)%. We fit the Dalitz plot distribution using an isobar model and report the measured values o....

By Alexei Dvoretskii--California Institute of Technology--2006-03-20
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A design technique for kW level switching mode power amplifiers is presented. Several push pull pairs, independently tuned to Class E/Fodd, are combined by a distributed active transformer. The zero voltage switching (ZVS) condition is investigated and modified for the Class-E/Fodd amplifier with a non-ideal output transformer. All lumped elements including the DAT, the....

By Sanggeun Jeon--California Institute of Technology--2006-03-06
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