Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 206 for “"Scale Structure"”.
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Large-Scale Structure of Mitotic Chromosomes
"SAR/MAR sequences have been hypothesized as forming the bases of DNA loops in metaphase chromosomes. To test the structural role of SAR/MAR sequences, we created stable cell lines containing chromosomes with regions of high density of integrated SAR/MAR sequences. CHO cells were isolated …
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Large-scale structure of the early universe
The large-scale structure of the universe is one of the most active areas of research in modern astronomy. However, until recently our knowledge of the distribution of matter on large scales has been primarily limited to two epochs - the present epoch and the epoch of recombination - and …
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Modeling large scale structure from photometric surveys
… of galaxy angular correlations on larger scales. We analyze the clustering of photometrically selected galaxy pairs by using the HOD model. Our results are successfully fit by these HOD models, and we see the separation of “1-halo” and “2-halo” clustering terms for both single galaxies and …
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Cosmology with CMB and Large Scale Structure
… Microwave Background (CMB) radiation and Large Scale Structure(LSS), in order to test different models of the Universe. This is the main aim of this thesis. The standard inflationary $\Lambda$-dominated Cold Dark Matter ($\Lambda$CDM) model is based on the premise that the Universe is …
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Atomic-Scale Structure and Catalytic Reactivity of RuO2
The structure and reactivity of the oxygen phases on Ru(0001) and Ru(100) and the bulk RuO2(101) surface were studied by quantitative LEED I/E analysis, TDS and AES. On Ru(0001), the (2´ 2)-3O phase forms at an O coverage of 0.75 ML. The atomic structure of this phase turned out to be a (2´ 2) …
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Simulations of Galaxy Formation and Large Scale Structure
… as was observed later - revealing the origin of structure in the Universe. Today, cosmology and especially galaxy formation are fast paced exciting scientific fields. Surveys like the Sloan Digital Sky Survey will soon provide a catalogue of about 500 million galaxies with an unprecedent wealth …
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Projected Angular Statistics for Large-scale Structure Cosmology
The large-scale structure (LSS) in the distribution of matter is an important probe for us to understand the universe. Being complementary to the cosmic microwave background (CMB) radiation, the LSS enhances the constraints on the properties of dark matter and dark energy, modified gravity and …
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Probing primordial non-Gaussianity using large scale structure
… red galaxies we find new bounds on the large-scale nonGaussianity. We constrain the fNL parameter using a particular type of triangular configuration as well as the combination of all the possible triangles in harmonic space. The constraint on fNL from the combination of all possible …
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Quasar formation in the context of large scale structure
… of quasars in the context of the large-scale structure in galaxy clusters. Our results are somewhat different from what was previously thought - a direct consequence of this new perspective and more powerful methods of analysis. In contrast with previous studies, which relied on the …
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The ΛCDM Effective Field Theory of Large Scale Structure
The Large Scale Structure (LSS) of the Universe, that being the large scale distribution of dark and baryonic matter and of the halos and galaxies they form, promises to be a source of unprecedented amounts of information in the near future, with hundreds of millions of galaxies being mapped by …
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Advancing the Matter Bispectrum Estimation in Large-Scale Structure
… applied to CMB analyses, similar work on large-scale structure is still in its infancy. Additionally, information from future galaxy surveys such as LSST and Euclid will soon exceed that available from the CMB, demonstrating a pressing need for such tools. The theoretical modelling of non-linear …
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Internal atomic-scale structure and photothermal dynamics of heterostructured nanomaterials
… approach to unravel the internal structure and the photoexcited electronic and geometric structural dynamics of Cd𝑥Zn1−𝑥Te/CdSe core/shell quantum dots (QDs). These QDs belong to a broader class of heterostructured II-VI semiconducting that are known for their applications in …
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Modeling Astrophysical and Large-Scale Structure Signatures in Axion Cosmologies
… of FDM across intergalactic and group/cluster scales. We begin by studying density, shape and weak lensing statistics in FDM cosmologies, finding strong departures from the universality of density profiles and the monotonicity of shape profiles observed in the vanilla cold dark matter (CDM) …
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Large scale structure from motion for autonomous underwater vehicle surveys
… - low overlap, non-uniform lighting and unstructured motion - and present a methodology for dealing with these constraints toward a solution of the problem of large area 3D reconstruction. Our approach assumes navigation data is available to constrain the structure from motion problem. We …
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On the evolution of large-scale structure in a cosmic void
Future large-scale structure surveys are expected to pin-down the properties of dark energy significantly more by mapping the cosmic web to unprecedented precision. To take advantage of such state-of-the-art technologies, the evermore accurate modelling of structure formation is absolutely …
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Robust Estimation Techniques for the Cosmological Analysis of Large Scale Structure
… of the cosmic microwave background and large-scale structure. The next generation of large-scale structure surveys is expected to answer many open questions about the microscopic description of the Universe. In order to fully leverage those data sets, one needs exquisite theoretical …
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The importance of scale structure in scattering from random, rough surfaces
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1998.
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Multi-Scale Structure and Dynamics of Visual Signaling in Drosophila Photoreceptor Cells
… design principles. I focused on three levels of structure in the system: compartmentalization of molecules into microvilli, modularity of dynamic scaffolding by InaD, and functional integration within a single domain of InaD. Using rigorous quantitative measurement and theory with an evolutionary …
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Paleocosmology : observational constraints on the evolution of galaxies and large-scale structure
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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