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.
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Showing 1 to 20 of 1328 for “"Anisotropy"”.
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Permeability anisotropy and resistivity anisotropy of mechanically compressed mudrocks
Permeability anisotropy (the ratio of the horizontal to vertical permeability) is an important parameter used in sedimentary basin models and geotechnical design to model fluid flow, locate hydrocarbon reserves and estimate stress and pressure evolution. The magnitude of the permeability anisotropy …
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Dark energy and CMB anisotropy
… the Cosmic Microwave Background (CMB) anisotropy power on large angular scales appears to be significantly lower than predicted by the standard model of cosmology. We propose a scalar field model of the dark energy as a mechanism for suppressing low l multipoles through late-Universe …
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Permeability anisotropy of resedimented mudrocks
Permeability anisotropy (ratio of horizontal to vertical permeability) is an important but uncertain parameter used in characterizing underground formations. While it is a fairly unknown parameter, it is integral for the petroleum industry, where a greater permeability anisotropy understanding can …
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Seismic anisotropy in siliciclastic reservoir rocks
… of geophysical field measurements of seismic anisotropy is presently limited by our knowledge of the controls of the elastic anisotropy of sedimentary rocks in the subsurface. Traditionally, laboratory ultrasonic velocity measurements have been used to provide important information on bulk …
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Manipulation of magnetic anisotropy in nanostructures
… materials with high, medium or low magnetic anisotropy and their possible manipulation are required. The most dramatic manifestation in this respect is the chance to manipulate the magnetic anisotropy over the intrinsic preferential direction of the magnetization, which can open up more …
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River network scaling: optimality and anisotropy
… slope in initial conditions, which is a type of anisotropy since it provides a preferential direction for flow. Simulated river networks exhibit scaling deviations and crossover behavior as a result of slope. I also measure the scaling of twelve natural river networks with a parallel pattern, …
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Anisotropy of resedimented Boston Blue Clay
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1990.
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Extracting Polar Anisotropy Parameters from Seismic Data
… for comparison; this procedure suppresses the anisotropy information in the real data. In this study, I tested a new method, using log data of Vp, Vs, and density, together with seismic pre-stack Common Depth Point (CDP) gathers near the well site, to deduce anisotropy parameters from them. …
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Anisotropy and texture studies in magnetic media
… new extended rotational remanence technique for anisotropy field measurements was developed. The technique is suitable for samples that contain aligned or partially aligned particles and provides both: in-plane anisotropy field distributions and the in-plane anisotropy field. This technique was …
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Critical current anisotropy in high temperature superconductors
… This thesis presents an investigation of the Jc anisotropy in HTS. The use of thin films grown on off c-axis (vicinal) substrates allowed the effect of current directions outside the cuprate planes to be studied. With this experimental geometry Berghuis, et al. (Phys. Rev. Lett. 79, 12, pg. 2332) …
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Anisotropy, Birefringence, and Dispersion in Artificial Dielectrics
Made available in DSpace on 2014-12-12T20:54:43Z (GMT). No. of bitstreams: 1 7804126.pdf: 6423124 bytes, checksum: 1e680364d4ca7155bc61597a574bdf7d (MD5) Previous issue date: 1977
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Optomechanical anisotropy in nanoengineered polymer photonic crystals
Symmetry in photonic crystals is reflected in the structure of their photonic bands and symmetry breaking can result in the development of complete photonic band gaps, leading to enhanced optical properties. This can be difficult for self-assembled nanostructures, due to their restriction by …
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Plastic anisotropy of body-centered cubic metals
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Mining and Metallurgy, September 1967.
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Structure and anisotropy of the upper mantle
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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Quantitative anisotropy imaging with polarized interference microscopy
Optical anisotropy measurement is essential for material characterization and biological imaging. Many optical anisotropy imaging techniques have been developed, such as fluorescence polarization microscopy(FPM), liquid crystal based polarization microscopy (LC Polscope), polarization state optical …
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Real time PCR measurement by fluorescence anisotropy
… real-time PCR that utilizes the fluorescent anisotropy (FA) of labeled primers. FA, when measured at constant temperature, is indicative of the molecular mass to which the fluorophore is attached. Specificity is improved with the FA method over the use of intercalating dyes since the …
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Stress-strain-strength anisotropy of varved clays.
Thesis. 1977. Sc.D.--Massachusetts Institute of Technology. Dept. of Civil Engineering.
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Transport and Anisotropy inside Ionic Polymer Membranes
… some fundamental issues regarding transport and anisotropy, structural heterogeneity and molecular interactions inside ionic polymers. I first discuss a main deficiency of a standard protocol for calibrating high pulsed-field-gradient NMR. I show that high gradient calibration using low γ nuclei …
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Quantitative Anisotropy Imaging based on Spectral Interferometry
… nanoparticle. Alongside developing optical anisotropy imaging systems, the other part of this research describes our effort of investigating the sensitivity limit for general spectral interferometry based systems. A complete, realistic multi-parameter interference model is thus proposed, …
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