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caltechETD 檢索結果共 5156 筆,本頁資料從第 73 筆到第 84 筆

We present the unification of many previously disparate results in noisy quantum Shannon theory and the unification of all of noiseless quantum Shannon theory. More specifically we deal here with bipartite, unidirectional, and memoryless quantum Shannon theory. We find all the optimal protocols and quantify the relationship between the resources used, both for the one-s....

By Anura Yamesh Abeyesinghe--California Institute of Technology--2006-05-23
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Ultrafast electron diffraction (UED) has been applied to determine the structures of isolated molecules and the dynamics of their excited states. Preceding the experimental accounts is a detailed discussion of the theoretical methodology behind UED in the Caltech labs. The procedure is explained by which electron scattering signal is measured and processed to allow the ....

By Jonathan Stuart Feenstra--California Institute of Technology--2006-05-23
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Circle Pattern is a novel method for the construction of discrete conformal mappings from surface meshes of arbitrary topology to the plane. This approach is based on representing mesh as arrangements of circles â one for each face â with prescribed intersection angles. Given these angles the circle radii follow as the unique minimizer of a convex energy. The method s....

By Liliya Kharevych-Computer Science-California Institute of Technology-masters-2006-05-22
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This thesis introduces a new programming model based on speculative execution and it examines the use of speculations, a form of distributed transactions, for improving the performance, reliability and fault tolerance of distributed systems. A speculation is defined as a computation that is based on an assumption that is not validated before the computation is started. ....

By Cristian Tapus-Computer Science-California Institute of Technology-doctoral-2006-05-22
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To predict future climate change, we must accurately predict future atmospheric concentrations of CO2 and CH4. The current budget has typically been inferred from top-down analyses of measurements from a global network of surface sites. These measurements are highly accurate, but have limited spatial coverage. In addition, accurate knowledge of local planetary boundary ....

By Rebecca Ann Washenfelder--California Institute of Technology--2006-05-22
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The experiments discussed in this thesis investigate the application of atomic ensembles in building a quantum network. Specifically, the atomic ensembles refer to cesium atoms in magneto-optical traps. Chapter 1 gives an introduction to quantum networks, along with the difficulty in extending the range due to the optical loss of communication channels. Chapter 2 descri....

By Chin-wen Chou--California Institute of Technology--2006-05-22
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The optical properties, health effects, atmospheric lifetime, and climate impact of ambient aerosols are influenced directly by their size distribution, chemical composition, and phase. The aerosol hygroscopicity, which is also a function of composition, governs the size and phase changes of these particles when subjected to varying ambient relative humidities (RH). Thi....

By Varuntida Varutbangkul--California Institute of Technology--2006-05-22
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New 350 micron data constrain accurately the thermal far-infrared spectral energy distributions (SEDs) for 12 distant submillimeter selected galaxies (SMGs). The results confirm that the linear radio to far-infrared correlation, established for local infrared galaxies, holds out to high redshifts z ~ 1--3. The low correlation constant q ~ 2.14 is more indicative of star....

By Attila Kovacs-Physics-California Institute of Technology-doctoral-2006-05-19
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We argue that two specific wave packet families---curvelets and wave atoms---provide powerful tools for representing linear systems of hyperbolic differential equations with smooth, time-independent coefficients. In both cases, we prove that the matrix representation of the Green's function is sparse in the sense that the matrix entries decay nearly exponentially fast (....

By Laurent Demanet--California Institute of Technology--2006-05-19
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Understanding the processes that change the amount of carbon stored in the ocean and in the land biota, with their implications for future climate and ecology, is a fundamental goal of earth-system science. I have developed, refined, and applied several approaches that combine data analysis and modeling to better understand processes affecting carbon fluxes. (1) Using a....

By Nir Yitzhak Krakauer--California Institute of Technology--2006-05-19
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Each neuron in the mammalian central nervous system makes up to ten thousand synaptic connections with other neurons yet is able to regulate the strength of individual connections locally. Synaptic enhancement or depression induced at one location on the dendritic arbor does not spread through out the entire neuron. This means neurons must be able to regulate the comple....

By Baris Bingol--California Institute of Technology--2006-05-19
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Optical trapping as a viable means of exploring the physics of ultracold dilute atomic gases has revealed a new spectrum of physical phenomena. In particular, macroscopic and sudden occupation of the ground state below a critical temperatureâ-a phenomenon known as Bose-Einstein condensationâ-has become an even richer system for the study of quantum mechanics, ultracol....

By Nathan Eric Lundblad--California Institute of Technology--2006-05-19
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